JP2009084918A - Underground structure construction method and underground structure constructed by the construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a trouble that an underground structure peripheral wall cannot be smoothly press-fitted and settled into the ground caused by friction and viscosity with respect to a soil wall surface due to the fact that an erect plate of a lower frame has a vertical surface, and the lower frame suffers insufficient strength, and to improve the waterproofness and heat insulation properties of the underground structure peripheral wall. <P>SOLUTION: There is provided an underground structure peripheral wall construction method for settling an open-type caisson composed of the lower frame and the underground peripheral wall into the ground. The interior of the lower edge of a cutting edge formed of an external peripheral plate and a bottom plate is reinforced with reinforced concrete, and inclined in a direction that slightly protrudes outward. Further the a waterproof panel is attached to the external peripheral surface of the underground structure peripheral wall on the ground. The underground structure is constructed by the underground structure constructing method. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a construction method for an underground structure in which a peripheral wall for an underground structure constructed on the ground is excavated and submerged in the ground surrounded by the peripheral wall for the underground structure, and an underground structure obtained by this construction method Related to things.

  There is a so-called submersible construction method for constructing an underground structure consisting of a basement, an underground water tank, etc. in the basement. The submersible construction method is a construction method in which the surrounding wall for the underground structure built on the ground is submerged in the underground, while the underground structure is submerged in the water and the inner ground surrounded by the surrounding wall for the underground structure is excavated. There is a construction method in which the peripheral wall for underground structures is gradually submerged to the basement. The latter construction is performed by an open caisson having a frame structure (a peripheral frame shape having no bottom on the inner side) in which a blade is provided at the lower part.

  Many open-type caissons are constructed by providing a peripheral wall for an underground structure on a lower frame. In this type of caisson construction, the lower frame is first manufactured on the construction site, and then the caisson is submerged in the so-called submerged construction method. For this reason, the basement of the underground structure is constructed after the peripheral wall for the underground structure is sunk underground.

  In the construction where the open caisson is submerged by the submerged method, the caisson is produced on the ground, so there is no collapse of the soil wall compared to the case where the peripheral wall for underground structures is constructed underground. Even if groundwater flows out during construction, it hardly flows into the work place surrounded by caisson, so the burden and danger of construction work are greatly reduced, construction period is shortened, and construction cost is reduced. There are various advantages.

  Regarding the open caisson, for example, a wall panel of a precast concrete basement disclosed in Patent Document 1 is a hollow blade beam at the bottom of an H-shaped steel beam 16 as shown in FIG. 17 is attached, and the wall panel 1 (2) is constructed on the H-shaped steel beam 16. In a part of the description of paragraph “0012” of Patent Document 1, “(16) is an H-shaped steel beam connecting the lower ends of the wall panels (1) and (2), and (17) is the beam (16 ), And is for facilitating press-fitting into the ground. " And when FIG. 1 of patent document 1 is grouped, it has the hollow shape which this beam (16) and blade edge beam (17) were united.

  Regarding the open caisson, in the construction method of the underground structure disclosed by Patent Document 2, the blade edge portion provided at the lower end portion of the concrete peripheral wall is “the blade edge portion” according to paragraph “0022” of Patent Document 2. 10 is made by press-molding a steel material and has a peripheral frame shape with an upper end opened along the outer shape of the underground structure to be constructed. From FIG. 2 to FIG. 7 of Patent Document 2, the concrete to be placed when the concrete peripheral wall is constructed reaches the tip of the blade edge portion, and therefore the blade edge portion is internally reinforced with concrete. Become.

  As shown in FIG. 1 of Patent Document 1, the cutting edge beam having the peripheral frame shape described in Patent Document 1 has an upright plate portion formed on a vertical surface on the outer peripheral side. Paragraph “0022” of Patent Document 2 states that “the cross-sectional shape of the blade edge portion 10 has a wedge-shaped blade edge frame 12 at the lower end, the outer surface side of the blade edge frame is a vertical side, and the inner surface side is an inclined side. It is written.

  Regarding the waterproofing of the peripheral wall for the underground structure in the open caisson, paragraph “0017” of Patent Document 2 states that “the waterproofing can be performed on the outer surface of the concrete peripheral wall. Thus, a coated waterproof layer can be formed. "

JP-A-5-163740 JP 2001-323485 A

  However, as shown in FIG. 1 of Patent Document 1, the blade edge beam 17 described in Patent Document 1 has a hollow shape integrally provided below the beam 16 of H-shape steel. When the wall panel 1 (2) is pressed into the ground, if the ground is hard or there is rock in the ground, the edge beam 17 may be deformed. In addition, the wall panel 1 (2) is tilted during the press-fitting of the wall panel 1 (2) toward the ground, or the soil is partially removed from the ground below the blade beam 17 so that the blade If a load from the wall panel 1 (2) is applied to a part of the mouth beam 17, the blade edge beam 17 may be deformed.

  Since the cutting edge part described in Patent Document 2 is reinforced with concrete, it is a relatively strong cutting edge part, but the concrete in the cutting edge part is placed simultaneously with the concrete forming the concrete wall surface. When the concrete is placed, due to the load applied from above by the placed concrete, the cutting edge portion is easily deformed in a bending direction. Further, as shown in FIG. 6 of Patent Document 2, since it is fixed so as to cover the periphery of the upper edge of the blade edge frame 12 which is the blade edge portion 10 which is a plate surface, when the concrete is placed, the upper portion by the placed concrete The blade edge portion 10 is deformed in the direction in which the blade edge portion 10 spreads due to the load applied from the blade, and a gap may be formed between the blade edge portion 10 and the blade edge frame 12. 10 may receive a large resistance due to the soil wall surface, and the settlement may be delayed or the blade edge portion 10 may be destroyed.

  The most important point of underground work by the submersible construction method is the strength performance of the lower frame, and the lack of strength of the lower frame is an obstacle to press-fitting an open caisson with the lower frame and the wall together. Moreover, when the open caisson is press-fitted into the ground, the wall surface cracks, causing groundwater to enter the inner space surrounded by the wall surface during and after construction.

  As a result, the concrete peripheral wall may be cracked due to the bending of the blade edge while the concrete wall is submerged in the basement. In Patent Document 2, a part of the description of claim 6 has a description that “applying a coating waterproof layer on the outer surface of the concrete peripheral wall”, but the coating waterproof layer does not fill a crack generated in the concrete peripheral wall. In some cases, cracks may occur with the applied waterproof layer.

  Further, as shown in FIG. 1 of Patent Document 1, the outer peripheral side plate portion of the blade edge beam described in Patent Document 1 has a concrete peripheral wall in the ground when the outer peripheral surface of the blade edge beam 17 is formed vertically. When sinking, the soil wall surface sheared by the blade edge beam 17 and the outer peripheral surface of the edge beam 17 are brought into close contact with each other, and a large frictional force is generated between them to become a resistance to settlement of the concrete peripheral wall. For this reason, it is easy to produce the malfunction that subsidence toward the underground of a concrete surrounding wall is not performed smoothly. In particular, when the soil wall sheared by the edge beam 17 is a clay chamber, the clay adheres to the outer peripheral surface of the edge beam 17 to further delay the settlement of the concrete peripheral wall into the ground. There is a risk that the surrounding wall will sink.

  Paragraph “0018” of Patent Document 2 states that “If the outer shape of the blade edge portion protrudes outside the outer surface of the concrete peripheral wall, the contact between the inner surface of the ground dug down by the sinking of the blade edge portion and the concrete peripheral wall may be reduced. Since the frictional resistance is reduced, the cutting edge and the concrete peripheral wall can sink smoothly. However, the entire outer shape of the cutting edge protrudes outward from the outer peripheral surface of the concrete peripheral wall. In the state, the outer peripheral surface of the cutting edge part and the inner surface of the ground dug down by the sinking of the cutting edge part are in close contact with each other, so the problem described in the previous paragraph is not solved.

The outer peripheral surface of the blade edge part is considerably narrower than the concrete peripheral wall, but when the external pressure due to soil on the soil wall surface (inner surface of the ground) is applied to the outer peripheral surface of the blade edge part or the soil wall surface is clayey , Greatly reduces the shearing action of the ground by the cutting edge. This is the same reason that, for example, if a glue or adhesive is attached to the blade edge of a ridge, even thin paper cannot be cut.

The problem to be solved by the present invention is:
(1) To solve the problems caused by insufficient strength that the conventional lower frame (the blade edge beam described in Patent Document 1 and the blade edge part described in Patent Document 2 correspond to),
(2) Eliminating the problems that adversely affect caisson settlement caused between the soil wall surface and the lower frame frame due to the fact that the outer peripheral surface of the conventional lower frame is a vertical surface;
(3) The underground press-fitting and setting of the peripheral wall for the underground structure is to improve the waterproof property or the heat insulating property as compared with the conventional peripheral wall for the underground structure.

  In addition, it is possible to set the underground wall for underground structures other than those made of reinforced concrete in the basement by the submerged method. In the large wall for underground structures, the lower part is temporarily submerged and then the lower part. This includes assembling the upper part on top of it so that the rest can be settled.

  Furthermore, in the underground structure which concerns on this invention, it is an underground structure obtained by the construction method of the underground structure which concerns on this invention.

The construction method for an underground structure according to claim 1 starts with the manufacture of a lower frame frame having a blade edge directed downward, and an open caisson having a peripheral wall for the underground structure provided on the lower frame frame. After manufacturing and excavating the inner soil surrounded by the caisson to sink the caisson underground, the remaining construction for constructing the underground structure having the peripheral wall for the underground structure is performed In the construction method of underground structures
The lower frame frame is manufactured to the extent that a plurality of reinforcing bars are arranged in the inner space of the lower frame frame body and at least most of the inner space is buried after the lower frame frame body made of steel plate is manufactured. It is characterized by placing concrete and curing and curing the concrete, and after the production of the lower frame frame, a construction is performed in which a peripheral wall for an underground structure is provided on the lower frame frame.

  An open-type caisson (open caisson) is a caisson having a downwardly facing blade edge at the lower part, and in the present invention, it has a peripheral frame shape substantially matched to the size and shape of the peripheral wall for underground structures. The caisson has a wall for underground structures built on the lower frame.

  The lower frame makes it possible to sink the wall of the underground structure by applying a load from the wall of the underground structure when the wall of the underground structure sinks to the basement by the submerged method. In the process of sinking into the basement and after being set up in the basement, the peripheral wall for the underground structure is supported to stabilize the posture of the peripheral wall for the underground structure, and cracks and the like are hardly generated in the peripheral wall for the underground structure.

  The lower frame used in the construction method of the peripheral wall for underground structures according to claim 1 is a lower frame having a hollow structure made of steel plate because the inside of the lower frame frame body made of steel plate is reinforced with reinforced concrete. Compared to the frame and the lower frame that is internally reinforced with concrete, the strength is greatly improved, and even if a load from above due to the weight of the peripheral wall for the underground structure is applied, the problem of bending or deforming Has been improved. For this reason, it is also remarkably improved that cracks (clarks) are generated in the peripheral wall for concrete underground structure during the subsidence of the peripheral wall for underground structure.

  In addition, when the lower frame is internally reinforced with reinforced concrete, the ground is sheared without being deformed even on the hard ground, and the peripheral wall for the underground structure is sunk into the basement.

  The lower frame frame internally reinforced with conventional concrete is made by filling the lower frame frame with concrete for constructing a peripheral wall for underground structures thereon. That is, the concrete in the lower frame and the concrete for forming the peripheral wall for the underground structure are placed at the same time, and curing and curing proceed simultaneously. For this reason, there is a possibility that the lower frame is bent or deformed in an expanding direction by applying an excessive load of the concrete before curing and curing the concrete.

  On the other hand, in the construction method of the underground structure according to claim 1, the construction in which the lower frame frame body is internally reinforced with reinforced concrete is performed first, and the lower frame after the concrete is cured and hardened is extremely robust. Therefore, even when a load is applied by the peripheral wall for the underground structure made of concrete when the peripheral wall for the underground structure is provided on the lower frame frame, the situation in which the lower frame frame is bent or deformed hardly occurs.

  In the construction method of the surrounding wall for underground structures according to claim 1, the surrounding wall for underground structures on the extremely strong lower frame is constructed on the ground, and then the lower frame and the surrounding wall for underground structures By excavating the inner soil surrounded by the surrounding wall for underground structures, the caisson's own weight is used to shear the ground with the blade edge at the bottom of the lower frame frame. , Sink to the basement.

  The extremely sturdier bottom frame shears without deformation even in hard soil, and sinks the caisson smoothly.

  The construction method for an underground structure according to claim 2 is the construction method described above, wherein the lower frame frame is provided with a predetermined interval from the inside of the lower frame frame to a part thereof or is elongated. A lower frame frame having a structure in which a part of the bolt protrudes long is used.

  A part of a reinforcing bar or a long bolt that protrudes upward from the inside of the lower frame frame is embedded in the peripheral wall for the underground structure when the peripheral wall for the underground structure is provided on the lower frame frame, Or it is fastened to the surrounding wall for underground structures. These reinforcing bars and long bolts are used to stabilize the posture of the surrounding wall for the underground structure and to firmly integrate the surrounding wall for the underground structure and the lower frame frame. Is firmly fixed in the concrete in the lower frame.

  The construction method of an underground structure according to claim 3 is the outer circumference along the frame direction of the lower frame frame in any one of the construction methods described above, in the lower frame frame body made of steel plate forming the outer shape of the lower frame frame An outer peripheral side plate portion that forms a surface, an inclined plate portion provided toward a middle position obliquely above the outer peripheral side plate portion away from a location along the lower edge of the outer peripheral side plate portion, and A schematic shape is formed by a middle-stage bottom plate portion provided in the inner lateral direction from a location along the inner edge, and an inner peripheral side plate portion provided upward from a location along the inner peripheral edge of the middle-stage bottom plate portion. A lower frame frame main body having a shape in which a blade edge formed by the outer peripheral side plate portion and the inclined plate portion is formed and the upper end is greatly opened is used.

  The lower frame frame used in the construction method of the underground structure according to claim 3 has a large opening at the upper end of the lower frame frame body forming the outer shape, and a reinforcing bar is inserted into the inner space of the lower frame frame body from here. Concrete is cast. The concrete surface after being cast is flat and integrated with the concrete placed to form a peripheral wall for underground structures to be performed later. However, the peripheral wall for the underground structure provided later does not limit the peripheral wall for the underground structure made of reinforced concrete formed by placing concrete, for example, the peripheral wall for the underground structure made of precast concrete, made of steel plate It may be a peripheral wall for underground structures.

  The construction method for an underground structure according to claim 4 is the outer circumference that forms the outer peripheral surface of the lower frame frame body in the lower frame frame body made of a steel plate that forms the outer shape of the lower frame frame. A lower frame frame main body having a shape in which the side plate portion is inclined outwardly with an inclination angle of 1 to 5 ° from the upper end edge of the outer peripheral side plate portion or a portion at an intermediate height toward the lower edge is used.

  The lower frame frame is made by reinforcing the steel frame's lower frame frame body internally with reinforced concrete. For this reason, the outer peripheral side plate portion of the lower frame frame main body is inclined. Will also be inclined.

  When inclined from the upper end of the outer peripheral side plate part or the middle height part toward the lower edge with an inclination angle of 1 to 5 °, the tip part of the blade edge which is the lower end of the lower frame frame is It is located on the outermost side of the surface above the tip. For this reason, there is a slight gap between the soil wall surface formed after shearing the ground with the blade edge at the bottom of the lower frame frame and the surface of the outer peripheral side plate part, and by this gap, when sinking, The friction which becomes the resistance of the slip which arises between a soil wall surface and the surface of an outer peripheral side board part is suppressed significantly.

  In particular, when the soil below the lower frame is clay, the clay has adhered to the outer side plate part, and this has been a great resistance to prevent subsidence. If there is a slight gap, there will be fewer opportunities for the clay to be strongly pressed and attached to the outer side plate part, and the friction that causes resistance to slip between the soil wall surface and the outer side plate part will be greatly increased. It can be suppressed.

  In the construction method of the surrounding wall for underground structures which concerns on Claim 5, in one of the said construction methods, the lower frame frame main body made from the steel plate which forms the external shape of a lower frame frame is a partial surface of a lower frame frame main body A lower frame frame having a structure in which narrow horizontal plates facing each other in the lateral direction are integrally formed at the upper end edge of each of the outer peripheral side plate portion and the outer peripheral side plate portion, or at the middle portion of the outer peripheral side plate portion. .

  This horizontal plate part supports the formwork for concrete placement and the panel of the peripheral wall for underground structures when constructing the peripheral wall for underground structures made of reinforced concrete on the lower frame frame. Another purpose is to firmly fix the reinforced concrete in the lower frame and the steel frame lower frame main body. Moreover, the horizontal plate portion reinforces the lower frame frame body, and thus the lower frame frame.

  This horizontal plate portion is composed of an outer horizontal plate portion integrated with the outer peripheral side plate portion and an inner horizontal plate portion integrated with the outer peripheral side plate portion, and between the outer and inner horizontal plate portions. The space to be the opening is provided. Each of the outer and inner horizontal plate portions is provided at a position that constitutes the upper end surface of the lower frame body or at a height position near the upper end.

  In the construction method of the peripheral wall for underground structures according to claim 6, in any one of the construction methods described above, the lower frame frame body made of a steel plate forming the outer shape of the lower frame frame has a length that divides the circumferential frame direction. A lower frame frame having a shape in which a plurality of divided frames are joined in a circumferential frame direction, and a joining plate portion is formed at both side ends of each divided frame in a direction to block the internal space of the lower frame frame main body. Is used.

  The lower frame frame body made of steel plate is manufactured at the construction site because it has a large shape that matches the peripheral wall for the underground structure to be built. This production is performed by combining and integrating the divided frames produced in advance at the factory.

  Conventionally, the divided frames are joined by welding, but the work of welding while maintaining the posture in which both side edges of the divided frames are in contact with each other is not easy and requires skill. There is a method in which flange surfaces are provided on both side ends of the lower frame frame body made of a steel plate, but the flange surfaces are brought into contact with each other and fastened with bolts and nuts. However, the flange surface becomes a resistance to delay later settlement.

  In the present invention, since the joining plate portion that is a surface to join the divided frames to face each other is directed to the inside of the lower frame frame main body, after assembling the divided frames, the joining plate portion is outside. It is in a position that can not be seen from, and does not become a resistance to the subsequent settlement. Also, unlike the case of welding, if a deviation is found in the shape of the lower frame frame body after assembling the split frame, it is possible to correct this deviation by loosening the bolts and nuts once. .

  In the construction method of the surrounding wall for underground structures according to claim 7, in any one of the construction methods described above, the lower frame frame body made of a steel plate forming the outer shape of the lower frame frame is provided with an inclined plate of the lower frame frame body. A lower frame frame main body having a shape in which a reinforcing plate portion is provided so as to be erected upward from an inner middle surface of the upper frame portion or the middle plate portion toward the internal space of the lower frame frame main body.

  The lower frame frame is made by reinforcing the steel frame lower frame body internally with reinforced concrete, and the reinforcing bars made of bars facing the long direction of the lower frame frame are used to prevent bending of the lower frame frame. It is done. In the present invention, a reinforcing plate portion that is stronger than the bar is provided inside the lower frame frame main body to further improve the stress resistance in the bending direction of the lower frame frame. The reinforcing plate portion, which is a vertical plate, is much stronger in stress resistance from the vertical direction than the bar, and improves the rigidity of the lower frame.

  In the construction method of the surrounding wall for underground structures which concerns on Claim 8, after providing a waterproof panel in the outer peripheral surface of the surrounding wall for underground structures in any one of the said construction methods, the surrounding wall for underground structures is sunk in the basement Construction to be done is performed.

  If the periphery of the peripheral wall for the underground structure is covered with a waterproof panel, the underground structure and the rainwater will not enter the interior of the underground structure after the underground structure is constructed underground. It is extremely difficult to install a waterproof panel after the surrounding wall for the underground structure has been submerged, and when the waterproof coating is applied around the surrounding wall for the underground structure, the waterproof paint deteriorates over time. The waterproof function is reduced. For this reason, in this invention, after fixing the waterproof panel around the surrounding wall for underground structures, an open-type caisson was sunk underground.

  In other words, if the perimeter wall of the underground structure is covered with a waterproof panel, after the underground structure is built in the basement, groundwater or rainwater penetrates into the underground structure peripheral wall and flows into the interior of the underground structure. Do not get wet with water droplets or moisture in the room.

  The waterproof panel is, for example, one layer structure made of any one of vinyl chloride resin, polypropylene, ABS, epoxy resin, etc., or a single metal plate such as an aluminum plate or a coated steel plate, or these For example, a commercially available waterproof panel having a thickness of about 50 mm, which is formed of a multi-layered board in which a plurality of materials are laminated, is mentioned.

  In the construction method of the surrounding wall for underground structures which concerns on Claim 9, in the said construction method, the waterproof panel provided in the outer peripheral surface of the surrounding wall for underground structures is the outer peripheral side type | mold for concrete placement at the time of manufacture of the said reinforced concrete surrounding wall Also used as a frame.

  When constructing a peripheral wall for underground structures made of reinforced concrete, formwork for placing concrete is used at positions on the outer side and inner side of the peripheral wall. In the present invention, the conventional type outer frame (outer panel) which is a discarded frame is made unnecessary by using the waterproof panel as the outer mold.

  After the waterproof panel is used as the outer peripheral formwork, both the peripheral wall for the underground structure and the lower frame frame are submerged as a waterproof panel for the peripheral wall made of reinforced concrete without being removed.

  A construction method for a peripheral wall for an underground structure according to claim 10 is the construction method according to any one of the above, wherein after the thermal insulation panel is provided on the outer peripheral surface of the peripheral wall for the underground structure, the peripheral wall for the underground structure is sunk in the basement. Construction is performed.

  If the periphery of the peripheral wall for the underground structure is covered with a heat insulating panel, it becomes difficult to cool the room due to the cold of the soil in the room of the underground structure in the winter or cold district after the underground structure is built underground. For this reason, even if room heating is modest, the room temperature is made comfortable. It is extremely difficult to provide a heat insulating panel after the peripheral wall for underground structures has been submerged. For this reason, in this invention, after providing the heat insulation panel in the outer peripheral surface of the surrounding wall for underground structures, an open type caisson was sunk in the underground. Examples of the heat insulation panel include a heat insulation panel in which foamed plastic or nonwoven fabric is fixed to a plastic plate or a metal plate.

  The construction method of the surrounding wall for underground structures which concerns on Claim 11 WHEREIN: The outer periphery for concrete placement at the time of manufacture of the reinforced concrete surrounding wall in the construction method in any one of the said construction methods WHEREIN: The heat insulation panel provided in the outer peripheral surface of the surrounding wall for underground structures Also used as a side mold.

  When constructing a peripheral wall for underground structures made of reinforced concrete, formwork for placing concrete is used at positions on the outer side and inner side of the peripheral wall. In the present invention, the conventional type outer frame (outer panel) which is a discarded frame is made unnecessary by using the heat insulating panel also as the outer mold.

The construction method of the peripheral wall for an underground structure according to claim 12 starts from the manufacture of a lower frame frame having a blade edge directed downward, and is an open type in which the peripheral wall for an underground structure is provided on the lower frame frame. After the caisson is manufactured, the inner soil surrounded by the caisson is excavated and the caisson is sunk underground, and the remaining construction for constructing the underground structure having the peripheral wall for the underground structure in the basement In the construction method of underground structures where
The caisson is composed of an upper part and a lower part, where the lower part is first submerged to the middle of the underground by the submerged method, and then the upper part is constructed on the lower part and the remaining subsidence is performed. There are features.

  When the surrounding wall for an underground structure (open caisson) is large, especially the surrounding wall for an underground structure that has a high vertical height is a large risk of submerged construction, which increases construction costs and makes it difficult to work. Also gets higher. For this reason, in the present invention, the lower part is first sunk halfway underground, and then the upper part is constructed above the lower part and is sunk underground.

The construction method of the peripheral wall for an underground structure according to claim 13 starts from the manufacture of a lower frame frame having a blade edge directed downward, and is an open type in which the peripheral wall for the underground structure is provided on the lower frame frame. After the caisson is manufactured, the inner soil surrounded by the caisson is excavated and the caisson is sunk underground, and the remaining construction for constructing the underground structure having the peripheral wall for the underground structure in the basement In the construction method of underground structures where
In the caisson, the wall surface is formed of a steel plate, the reinforcing rib is formed along the inner wall surface of the wall surface, and the reinforcing rib oriented in the horizontal direction located at the bottom is formed narrower than the other reinforcing ribs. A characteristic is that a caisson having a structured structure is used.

  In order to improve the strength of the open-type caisson, which is a peripheral wall for an underground structure made of a steel plate, it is necessary to form reinforcing ribs in multiple stages on the inner wall, but the lowermost reinforcing rib has a great resistance to subsidence. For this reason, in the present invention, among the reinforcing ribs oriented in the horizontal direction, the horizontal ribs oriented in the horizontal direction located at the lowermost level are formed to be narrower than the reinforcing ribs located in the upper level. A peripheral wall (open caisson) was used.

The construction method of the peripheral wall for an underground structure according to claim 14 starts from the manufacture of a lower frame frame having a blade edge directed downward, and is an open type in which the peripheral wall for an underground structure is provided on the lower frame frame. After the caisson is manufactured, the inner soil surrounded by the caisson is excavated and the caisson is sunk underground, and the remaining construction for constructing the underground structure having the peripheral wall for the underground structure in the basement In the construction method of underground structures where
The caisson is composed of an upper part made of steel plate and a lower part made of steel plate. First, the lower part is submerged to the middle of the underground by a submerged method, and then the upper part is constructed on the lower part, and the rest There is a feature in subsidence.

  When the caisson (surrounding wall for underground structures) is large, a caisson with a high vertical height requires a large amount of submergence work, which increases construction costs, makes work difficult, and increases the risk. For this reason, in the present invention, the lower part caisson is first sunk to the middle of the basement, and then the upper part caisson is assembled above the lower part caisson and set in the basement.

  The underground structure according to the present invention is an underground structure obtained by any one of the above-described underground structure construction methods.

  According to the construction method of the peripheral wall for underground structures according to claim 1, since the inside of the lower frame frame main body made of steel plate is performed using the lower frame frame reinforced with reinforced concrete, the peripheral wall for underground structures that is heavy The frame of the lower frame may be deformed or bent when the base frame is stubbornly supported, during subsidence of the surrounding wall for underground structures by the submersion method, or after the surrounding wall for underground structures is submerged in the basement. It has become possible to drastically improve the problems that can be drunk.

  According to the construction method of the peripheral wall for the underground structure according to claim 2, the lower frame frame is provided with a predetermined interval from the inside of the lower frame frame to the upper part, and a part of the reinforcing bar or the long bolt As a result of making it possible to perform construction using a lower frame that has a structure in which a part protrudes long, when installing a peripheral wall for underground structures on the lower frame, a part of this reinforcing bar and long bolt The tip of the wall is embedded in the surrounding wall for the underground structure or fastened to the surrounding wall for the underground structure to stabilize the posture of the surrounding wall for the underground structure, and the surrounding wall for the underground structure and the lower frame are firmly It can be integrated.

  According to the construction method of the peripheral wall for the underground structure according to claim 3, the construction using the lower frame whose outer shape is formed by the lower frame frame main body having a shape with a large opening at the upper end can be performed. From the large opening at the upper end of the lower frame frame body, it is now possible to insert reinforcing bars necessary for internal reinforcement of the lower frame frame and to place concrete. In addition, the peripheral wall for the underground structure to be performed later can be fixedly integrated with the lower frame frame in a stable posture.

  According to the construction method of the peripheral wall for the underground structure according to claim 4, the outer frame side plate portion that forms the outer peripheral surface of the lower frame frame main body is formed on the lower frame frame main body made of steel plate that forms the outer shape of the lower frame frame. A lower frame frame whose outer shape is formed by a lower frame frame body having an inclined angle of 1 to 5 degrees toward the lower edge from the upper edge or middle height of the outer peripheral side plate portion toward the lower edge. As a result of being able to carry out construction using the caisson, a gap is formed between the soil wall surface and the outer side plate part sheared by the blade edge due to the caisson settlement, In addition, the friction that prevents the slip generated between the soil wall surface and the outer peripheral side plate portion can be greatly reduced, and smooth subsidence has been implemented.

According to the construction method of the peripheral wall for an underground structure according to claim 5, the lower frame frame body made of a steel plate forming the outer shape of the lower frame frame includes an outer peripheral side plate portion constituting a part of the lower frame frame body, and It was made possible to perform construction using a lower frame frame having a structure in which narrow horizontal plates facing each other in the lateral direction are integrally formed at each upper end edge or middle part of the outer peripheral side plate portion, respectively. As a result, when constructing the reinforced concrete wall for the underground structure on the lower frame, the horizontal plate should support the formwork for placing concrete and the panel of the wall for the underground structure in a stable posture. Will be able to.
In addition, the reinforced concrete in the lower frame and the steel plate lower frame main body can be firmly fixed.

  According to the construction method of the peripheral wall for an underground structure according to claim 6, the lower frame frame body made of a steel plate forming the outer shape of the lower frame frame has a plurality of divided frames having a length separating the circumferential frame direction. It is possible to perform construction using a lower frame frame having a shape that is joined in the frame direction and has a shape in which a joining plate portion is formed on both side ends of each divided frame in a direction that blocks the internal space of the lower frame frame main body. As a result, it has become possible to easily and robustly perform joining in a posture in which both side edges of the divided frame are in contact with each other. As a result, it has become possible to produce a robust lower frame with excellent shape stability.

  According to the construction method of the peripheral wall for an underground structure according to claim 7, the lower frame frame body made of a steel plate forming the outer shape of the lower frame frame includes an inner side of the inclined plate portion or middle plate portion of the lower frame frame body. Construction using a lower frame frame having an outer shape formed by a lower frame frame body having a shape in which a reinforcing plate portion standing upward from an intermediate surface toward the inner space of the lower frame frame body is formed. As a result, the stress resistance in the bending direction of the lower frame can be further improved.

  According to the construction method of the peripheral wall for the underground structure according to claim 8, after the waterproof panel is provided on the outer peripheral surface of the peripheral wall for the underground structure, the underground wall for the underground structure can be installed in the basement. As a result, underground water and rainwater penetrate into the underground structure's peripheral wall and do not flow into the underground structure's room, and do not get wet with water droplets or moisture in the underground structure's room. It became possible to make it a comfortable room.

  According to the construction method of the peripheral wall for the underground structure according to claim 9, the waterproof panel provided on the outer peripheral surface of the peripheral wall for the underground structure can be used as the outer peripheral formwork for placing the concrete at the time of manufacturing the reinforced concrete peripheral wall. As a result, the cost and material cost required for installing and removing a conventional type outer frame (outer panel), which is a discarded frame, can be reduced, and the construction period can be shortened.

  According to the construction method of the peripheral wall for the underground structure according to claim 10, after the heat insulation panel is provided on the outer peripheral surface of the peripheral wall for the underground structure, the underground wall for the underground structure can be installed in the basement. As a result, the room after the underground structure was built underground can be brought to a comfortable room temperature with reduced influence of the cold soil in winter and cold regions.

  According to the construction method of the peripheral wall for the underground structure according to claim 11, the heat insulation panel provided on the outer peripheral surface of the peripheral wall for the underground structure can be used as the outer peripheral formwork for placing the concrete at the time of manufacturing the reinforced concrete peripheral wall. As a result, the cost and material cost required for installing and removing a conventional type outer frame (outer panel), which is a discarded frame, can be reduced, and the construction period can be shortened.

  According to the construction method of the peripheral wall for an underground structure according to claim 12, the caisson is composed of an upper part and a lower part, and the lower part is first submerged to the middle of the underground by a submerged method, and then the lower part is As a result of constructing the upper part on the top so that the remaining subsidence can be carried out, large-scale submersion work is facilitated, construction costs can be reduced, and work can be performed safely.

  According to the construction method of the peripheral wall for an underground structure according to claim 13, the wall surface is formed of a steel plate, the reinforcing rib is formed along the inner wall surface of the wall surface, and the reinforcement is directed in the horizontal direction located at the lowest level. As a result of enabling the construction using the caisson in which the caisson having the structure in which the rib is formed to be narrower than other reinforcing ribs can be performed, the caisson can be smoothly submerged into the basement. It was.

  According to the construction method of the peripheral wall for an underground structure according to claim 14, the caisson is constituted by the upper part made of steel plate and the lower part made of steel plate, and the lower part is first submerged to the middle of the underground by a submerged construction method, and thereafter As a result of constructing the upper part on the lower part so that the remaining subsidence can be performed, large-scale submersion work is facilitated, construction costs can be reduced, and work can be performed safely. It was.

  The underground structure according to the present invention is an underground structure obtained by any of the underground structure construction methods of the present invention, and thus exhibits the effects obtained by the respective construction methods of the present invention.

  The best mode for carrying out the present invention is a construction method for a peripheral wall for an underground structure according to Example 1 below.

  FIG. 1 is a perspective view showing an installation example of a lower frame frame body performed before the peripheral wall for an underground structure according to the first embodiment of the present invention is submerged in the basement, and FIG. 2 is a low-level ground on which the lower frame frame is installed. It is the perspective view which showed one example of.

As shown in FIG. 1, the construction of the peripheral wall for an underground structure according to an embodiment of the present invention is performed on a low-level ground G1 that is flattened by shallowly excavating the ground G where the underground structure is to be constructed. The process starts with assembling the lower frame frame main body 1 into a frame structure that matches the size of the peripheral wall for the underground structure (not shown in FIG. 2) and horizontally installing it on the low-level ground G1.
The low-level ground G1 facilitates the subsequent construction of the peripheral wall for the underground structure and the sinking work of the caisson (not shown in FIG. 2), makes the caisson sinking easy and smooth, It is provided to solidify the soil surface around the top with concrete, but it is not necessarily provided, and is determined according to the surrounding environment, soil quality, and construction plan.

  As shown in FIG. 2, a construction machine (not shown) such as a mini excavator or a bulldozer is provided so that the low-level ground G1 has a surface wider than a peripheral frame shape having a size along the outer periphery of the underground structure to be constructed. 1), the ground G is excavated shallowly in a concave shape, and the ground surface is leveled flat, and the soil wall surface around the low-level ground G1 is reinforced with a sheet pile Y so as not to collapse. Since the depth of the low-level ground G1 is determined by the construction plan, it is not necessarily limited, but is, for example, a depth of 30 cm to 100 cm. In order to facilitate the delivery of construction civil engineering machines (not shown) and materials such as mini excavators (mini-yumbo) and bulldozers in the subsequent work without forming a soil wall around the entire circumference of the lower ground G1. In addition, a part of the periphery of the low-level ground G1 may be left in a state where it does not become an obstacle to the work, and may be restored to the soil wall stopped by the sheet pile Y before the first concrete placement to be performed later. Absent.

  3 is a plan view showing an example of the overall shape of the lower frame frame main body 1, FIG. 4 is a front sectional view showing a part of the lower frame frame main body 1, and FIG. It is a partial front sectional view showing that there is an inclination angle.

  As shown in FIG. 3, the lower frame frame main body 1 has a housing structure in which a plurality of divided frames 1A, 1A,..., 1B, 1B. The lower frame frame main body 1 shown in FIG. 3 has a rectangular shape in plan view, but is not limited to this shape. For example, the lower frame frame main body 1 has a polygonal shape other than an elliptical shape, a circular shape, and a rectangular shape. There may be. The shape and size of the lower frame frame body 1 in plan view are determined by the shape and size of the peripheral wall for the underground structure to be constructed.

  The lower frame frame body 1 of the embodiment shown in FIG. 4 has an outer peripheral side plate portion 2 having a size substantially along the lower edge of the peripheral wall for the underground structure, and an obliquely upper inner side from a location along the lower edge of the outer peripheral side plate portion 2. A blade edge 4 directed downward is formed by the inclined plate portion 3 provided up to the middle height of the outer peripheral side plate portion 2, and the middle bottom plate portion extends from the location along the upper edge of the inclined plate portion 3 toward the inner lateral direction. 6 is formed, and an outer peripheral side plate portion 7 is formed upward from a location along the inner peripheral edge of the middle bottom plate portion 6, and is opposed to each of the locations along the upper end edges of the outer peripheral side plate portion 2 and the outer peripheral side plate portion 7. The horizontal plate portions 8 and 9 that are narrow in the horizontal direction are formed, and the opening portion 10 is formed between the horizontal plate portions 8 and 9. The lower frame frame body 1 is When viewed through the opening 10, a space S is formed therein.

  The width W1 of each divided frame 1A (1B) constituting the lower frame body 1 is not necessarily limited, but is 37 cm, for example. The height H1 of each divided frame 1A (1B) is not necessarily limited, but is 32 cm, for example. Inclination angle R of the inclined plate part 3 with respect to the horizontal plane As shown in FIG. 1, the construction of the peripheral wall for the underground structure according to one embodiment of the present invention is performed by shallowly excavating the ground G on which the underground structure is to be constructed. The lower frame frame body 1 is assembled into a frame structure that matches the size of the underground structure peripheral wall (not shown in FIG. 2) on the low-level ground G1, and is placed on the low-level ground G1. Start with horizontal installation.

As shown in FIG. 2, a construction machine (not shown) such as a mini excavator or a bulldozer is provided so that the low-level ground G1 has a surface wider than a peripheral frame shape having a size along the outer periphery of the underground structure to be constructed. 1), the ground G is excavated shallowly in a concave shape, and the ground surface is leveled flat, and the soil wall surface around the low-level ground G1 is reinforced with a sheet pile Y so as not to collapse.
Since the depth of the low-level ground G1 is determined by the construction plan, it is not necessarily limited, but is, for example, a depth of 30 cm to 100 cm. In order to facilitate the transport of construction civil engineering machines (not shown) and materials such as mini excavators (mini yumbo) and bulldozers in subsequent work without forming a soil wall around the entire circumference of the low-level ground G1. A part of the periphery of the corrugated ground G1 may be left in a state where it does not become an obstacle to the work, and may be restored to a soil wall surface stopped with a sheet pile Y before the first concrete placement to be performed later.

  3 is a plan view showing an example of the overall shape of the lower frame frame main body 1, FIG. 4 is a front sectional view showing a part of the lower frame frame main body 1, and FIG. It is a partial front sectional view showing that there is an inclination angle.

  As shown in FIG. 3, the lower frame frame main body 1 has a housing structure in which a plurality of divided frames 1A, 1A,..., 1B, 1B. The lower frame frame main body 1 shown in FIG. 3 has a rectangular shape in plan view, but is not limited to this shape. For example, the lower frame frame main body 1 has a polygonal shape other than an elliptical shape, a circular shape, and a rectangular shape. There may be. The shape and size of the lower frame frame body 1 in plan view are determined by the shape and size of the peripheral wall for the underground structure to be constructed.

  The lower frame frame body 1 of the embodiment shown in FIG. 4 has an outer peripheral side plate portion 2 having a size substantially along the lower edge of the peripheral wall for the underground structure, and an obliquely upper inner side from a location along the lower edge of the outer peripheral side plate portion 2. A blade edge 4 directed downward is formed by the inclined plate portion 3 provided up to the middle height of the outer peripheral side plate portion 2, and the middle bottom plate portion extends from the location along the upper edge of the inclined plate portion 3 toward the inner lateral direction. 6 is formed, and an outer peripheral side plate portion 7 is formed upward from a location along the inner peripheral edge of the middle bottom plate portion 6, and is opposed to each of the locations along the upper end edges of the outer peripheral side plate portion 2 and the outer peripheral side plate portion 7. Narrow horizontal plate portions 8 and 9 facing in the lateral direction are formed, and an opening portion 10 is formed between the horizontal plate portions 8 and 9. A space S is formed.

  The width W1 of each divided frame 1A (1B) constituting the lower frame body 1 is not necessarily limited, but is 37 cm, for example. The height H1 of each divided frame 1A (1B) is not necessarily limited, but is 32 cm, for example. The inclination angle R of the inclined plate part 3 with respect to the horizontal plane is not necessarily limited. For example, there is an inclination angle of 30 ° for a hard ground, and an inclination of 45 ° for a medium hardness ground. In the case of an object having a corner and a soft ground, the pressure receiving area and the resistance received from the ground are increased by setting a smaller inclination angle so that excessive subsidence does not occur. The shape and size of the lower frame frame body 1 to be selected also depends on the weight of the peripheral wall for the underground structure.

  As shown in FIG. 5, the outer peripheral side plate portion 2 of the lower frame frame main body 1 is inclined from the upper end toward the lower edge so that the lower edge is slightly outward. The inclination angle R1 of the outer frame plate part 2 with respect to the vertical is, for example, an inclination angle of 1 to 5 °, more preferably an inclination angle of 1 to 3 °. According to the test by the inventors, the outer frame plate When the caisson (not shown in FIG. 5) with the lower frame body having an inclination angle of 1.2 ° is submerged in the basement, the section 2 efficiently shears the ground and is sheared. The result that the favorable subsidence by the friction with the soil wall surface and the outer peripheral side board part 2 which were able to be reduced was seen was obtained.

  6 and 7 are front cross-sectional views showing other embodiments of the inclined structure of the outer peripheral side plate portion 2 in the lower frame frame main body 1.

  The outer peripheral side plate portion 2 of the lower frame frame body 101 shown in FIG. 6 is formed by an upper vertical plate portion 2a and a lower inclined plate portion 2b, and has a shape in which the entire lower inclined plate portion 2b protrudes outward. is doing. The outer peripheral side plate portion 2 of the lower frame frame main body 102 shown in FIG. 7 has an upper vertical plate portion 2a and a lower inclined plate portion 2c. Also in the outer peripheral side plate part 2 shown in FIG.6 and FIG.7, the same effect as the outer peripheral side plate part 2 shown in FIG. 5 is exhibited.

  8A is a perspective view showing an example of a corner divided frame 103 constituting a part of the lower frame body 1, and FIG. 8B is a diagram of adjacent divided frames 103 and 104. FIG. It is partial side surface sectional drawing which showed the example of joining.

  When both end surfaces of the adjacent divided frames 103 and 104 are joined to both end surfaces of the divided frames 103 and 104 of the embodiment shown in FIGS. In order to ensure that the bolt insertion holes 11a and 11b are opened up and down, the joining plate portions 11 and 11 are formed from the respective end faces of the outer frame plate portion 2 toward the space S direction. It is formed by welding. The upper ends of the bonding plate portions 11 and 11 are welded to the inner surface along the edge of one horizontal plate portion 8 positioned in the outer peripheral direction, and the lower ends of the bonding plate portions 11 and 11 are inclined plate portions. It welds to the inner side surface along the edge part 3, and also serves as reinforcement for preventing each edge part of the outer side frame board part 2, the horizontal board part 8, and the inclination board part 3 from deform | transforming.

  As shown in FIG. 8 (b), the adjacent divided frames 103 and 14 are aligned with their corresponding end faces and overlapped, and the overlapped joining plate portions 11 and 11 are then connected to bolts B and B, respectively. They are connected and integrated by fastening with nuts N and N. Instead of fastening with bolts B and B and nuts N and N, the end faces of the adjacent divided frames 103 and 14 are overlapped, and then the end faces of the adjacent divided frames 103 and 14 are welded together. You may make it make it.

  9 is a front sectional view showing a divided frame 105 according to another embodiment, and FIG. 9B and FIG. 10 are both front sectional views showing divided frames 106 and 107 according to another embodiment. is there.

  The divided frame 105 of the embodiment shown in FIG. 9A is further bent upward from the edge portions along the opposing one side of the horizontal plate portions 8 and 9 on both sides to face the opposing guide plate portions. 11 and 12 are formed upward. The guide plate portions 11 and 12 are provided in order to strengthen the jointing of the lower portion of the peripheral wall for the underground structure when the underground wall for the underground structure to be performed later is constructed by concrete placement. Further, when the peripheral wall for the underground structure is a precast concrete plate (not shown), the guide plate portions 11 and 12 can hold the lower portions thereof from both sides to strengthen the posture.

  The lower frame frame body 106 of the embodiment shown in FIG. 9 (b) is further bent upward from the edges along the opposing sides of the horizontal plate portions 8 and 9 on both sides to face the opposing ribs. 13 and 14 are formed, and on each of the ribs 13 and 14, guide plate portions 15 and 16 for reinforcing the joining surface at the lower part of the peripheral structure peripheral wall are formed facing upward. Has been. The guide plate portions 15 and 16 also have the same effects as the guide plate portions 11 and 12 shown in FIG.

  The divided frame 107 of the embodiment shown in FIG. 10 has an internal space of the divided frame 107 on the upper surface of the middle bottom plate 6 in the vicinity along the bent portion formed by the inclined plate 3 and the middle bottom plate 6. A reinforcing plate 17 is integrally formed to partition S into an outer side and an inner side and to prevent the lower frame frame body 1 from being bent. The upper end edge of the reinforcing plate 17 is further bent in the lateral direction, and the horizontal plate portion 17b is formed so as to have the same height as the one horizontal plate portion 9 located inside.

  FIG. 11A is a partial perspective view showing a state in which the lower frame frame body 1 is installed on the low-level ground G1 by being assembled and integrated into a frame structure, and FIG. It is the front sectional view shown.

  As shown in FIGS. 11A and 11B, the positions where the lower frame frame main body 1 is installed on the low ground G1 are, for example, the soil wall surface around the low ground G1 and the lower frame main body 1. The distance W2 from the outermost peripheral edge is, for example, a position of 30 cm to 100 cm, and the lower frame frame main body 1 is installed on the low stage ground G1 so as to ensure this distance.

  Since the lower frame frame main body 1 has a cutting edge at the lower part 4, it will be placed in an unstable state without any support. For this reason, when installing the lower frame frame main body 1 on the low-level ground G1, a support having a structure in which the height can be adjusted by providing intervals along the peripheral frame shape from both sides of the lower frame frame main body 1, respectively. It is made to support with the members 20 and 21.

  In this embodiment, as shown in FIG. 11B, the support member 20 that supports the lower frame frame body 1 from the outside is one end portion of a support plate 20b having an L-shape on an upright screw rod 20a. The structure of which is supported so that the height is adjustable is used. The support member 20 attaches the lower frame frame main body 1 to the outer peripheral side plate portion 2 of the lower frame frame main body 1 using the bolts 20c (or bolts and nuts) at the other end of the support plate 20b. To support.

  The support member 21 that supports the lower frame frame main body 1 from the inside has a structure in which one end portion of a support plate 21b having a flat plate shape is supported on an upright screw rod 21a so that the height can be adjusted. The support member 21 supports one side of the lower frame frame main body 1 by supporting the middle plate portion 6 of the lower frame frame main body 1 at the other end of the support plate 21b. It should be noted that the support plate 21b and the middle plate portion 6 are preferably mounted using bolts or bolts and nuts.

  When the lower frame frame main body 1 is supported by the support members 20 and 21 from both sides in this way, the lower frame frame main body 1 having long sides is installed on the low-level ground G1 in a horizontal posture and a stable posture. Is done. The support member is not limited to those having these structures, and the lower frame frame main body 1 may be supported using, for example, a jack or a sleeper.

  On one of the horizontal plate portions 9 on the inner side of the horizontal plate portions 8 and 9 of the lower frame frame main body 1, a rectangular spacer 25 having a rectangular shape narrower than the horizontal plate portion 9 is provided in the circumferential frame direction. Fixed across. The square spacer 2 is provided to support the reinforcing bars directed in the lateral direction in the peripheral frame when constructing the peripheral wall for the underground structure to be performed later and the inner plate frame for placing concrete. Consists of either square pipes, wooden squares, or concrete placement.

  12A is a partial perspective view showing an example in which reinforcing bars are arranged in the lower frame frame main body 1, and FIG. 12B is a front sectional view of the same.

  As shown in FIGS. 12A and 12B, the inner space S of the lower frame frame body 1 has a plurality of lower frame frame reinforcements along the peripheral frame shape of the lower frame frame body 1. The bars (reinforcing bars) 31 and 32 and a large number of U-shaped reinforcing bars (vertical bars) 33 that protrude several tens of centimeters upward from the inside of the lower frame frame main body 1 are arranged at appropriate intervals. The lower frame frame reinforcement bars 31 and 32 are provided to internally reinforce the lower frame frame body 1 with reinforced concrete so that the lower frame frame body 1 is not bent, deformed in the bending direction, or broken. It is done. The U-shaped reinforcing bar 33 has a long shape, and a lower end portion thereof is fixed on the seat plate 34 with a predetermined interval. After reinforcing the lower frame frame body 1 internally with reinforced concrete, the U-shaped reinforcing bar 33 is placed in the placed concrete when the concrete is placed above the lower frame frame body 1 to form the peripheral wall for the underground structure. The upper part of the U-shaped reinforcing bar 33 is embedded so that the lower frame frame main body 1 and the peripheral wall for the underground structure are integrated. The seat plate 34 is provided to determine the position and orientation of the U-shaped reinforcing bar 33 and to firmly fix the lower part of the U-shaped reinforcing bar 33 in the concrete K placed in the lower frame body 1.

  As shown in FIG. 12B, the width of the middle bottom plate portion 6 of the lower frame frame main body 1 is not so wide, so that the lower frame frame reinforcing bars 31 and 32 and the inner space S of the lower frame frame main body 1 are used. It is not easy to arrange the seat plate 34 with the U-shaped reinforcing bar 33 fixed in a stable posture. Therefore, the seat plate 34 and the middle bottom plate portion 6 of the lower frame frame main body 1 are integrated by welding, or are attached using bolts and nuts (not shown), or the seat plate 34 is placed. It is preferable to place concrete in advance up to a position F of the height to be stabilized so that the posture of the seat plate 34 is stabilized.

  After the bar arrangement work, the spacer metal fitting 24 shown in FIG. 12A is mounted between the horizontal plate portions 8 and 9 on both sides formed at the upper end of the lower frame frame body 1 with an appropriate interval. Is done. The spacer bracket 24 is a direction in which the lower frame frame main body 1 is expanded by external pressure applied to the direction in which the lower frame frame main body 1 is expanded by concrete when concrete is placed in the lower frame main body 1 in a later process. It is to prevent it from being deformed. For this reason, the spacer metal fitting 24 is removed from the lower frame frame body 1 after the concrete placed in the lower frame frame body 1 is cured and cured.

  When the operation of installing the lower frame frame main body 1 on the low-level ground G1 is finished, concrete is placed in the internal space S of the lower frame frame main body 1.

  FIG. 13A is a partial perspective view showing a state after placing concrete K in the lower frame frame main body 1, and FIG. 13B is a front sectional view of the same.

  As shown in FIGS. 13A and 13B, the concrete K is placed until the internal space S of the lower frame body 1 is filled. If it does in this way, the lower frame frame main body 1 turns into the lower frame frame 1X internally reinforced with the reinforced concrete. A large number of U-shaped reinforcing bars 33, 33,... Protrude upward about 30 to 50 cm at a predetermined interval on the upper part of the lower frame 1X thus completed.

  Concrete K1 is also placed on the portion of the low-level ground G1 surrounding the outside of the lower frame 1X. When the concrete K1 is placed, the lower portion of the support member 20 is filled with the concrete K1 without removing the support member 20 that supports the lower frame 1X from the outer peripheral direction. The thickness at which the concrete K1 is placed is, for example, 15 cm or more. When this thickness is present, the lower frame 1X is supported from the outer peripheral side by the concrete K1. After the curing and curing of the concrete K2, the posture of the lower frame frame 1X is stabilized without the lower frame frame body 1 being supported by the support member 20 from the outer peripheral direction. For this reason, as shown in FIG. 13 (b), the support plate 20b supporting one side of the lower frame 1X is removed.

  FIG. 14 is a front partial sectional view showing the lower frame frame main body 1Y having another internal structure together with another support structure.

  The bar arrangement structure inside the lower frame frame main body 1Y shown in FIG. 14 is different from the back reinforcement structure in the lower frame frame main body 1A shown in FIG. In the lower frame frame main body 1Y shown in FIG. 14, an L-shaped reinforcing bar 36 bent into an L shape and a short bar-shaped reinforcing bar 37 are used instead of the U-shaped reinforcing bar. One end side of the L-shaped reinforcing bar 36 protrudes long above the lower frame frame main body 1Y, and the other end side is located outside the opening formed in the inner peripheral side standing surface 7 of the lower frame frame main body 1Y. It protrudes long in the direction.

  The bar-shaped reinforcing bar 37 has a length approximately equal to the vertical height of the lower frame frame main body 1Y, and a screw portion 37a is formed on one end side thereof. The central portion of the bar-shaped reinforcing bar 37 is fixed by concrete K placed in the lower frame frame main body 1, and the screw portion 37 a extends downward from the opening formed in the middle plate portion 6 of the lower frame frame main body 1. Protruding. Further, the nuts N and N screwed on the screw portion 37a firmly maintain the rod-shaped reinforcing bar 37, and the support plate 21a supported by the middle plate portion 6 and the support member 21 of the lower frame frame main body 1 is supported. And are attached. The mounting between the horizontal flat plate portion and the support plate 21a is also performed by fastening with bolts B and nuts N. Also in the case of the lower frame frame main body 1Y, a plurality of lower frame frame reinforcing bars (horizontal bars) 31 and 32 are arranged in a direction along the lower frame frame main body 1Y.

  After the lower frame frame 1X (1Y) is manufactured in this way, the peripheral wall for the underground structure is constructed above the lower frame frame 1X (1Y).

  FIG. 15 is a front partial sectional view showing a construction example in which the outer panel plate 40 and the reinforcing bar structure 50 corresponding to the peripheral wall for the underground structure are provided above the lower frame 1X, and FIG. 16 corresponds to the peripheral wall for the underground structure. It is the fragmentary perspective view which showed one example of the bar arrangement structure for setting it as the rebar structure 50 made.

  As shown in FIG. 15, the outer panel 40 is located above the lower frame 1 </ b> X, more specifically, on the horizontal plate 8 on the outer peripheral side of the horizontal plates 8 and 9 of the lower frame main body 1. Is assembled in the circumferential frame direction along the horizontal plate portion 8 and provided above the lower frame frame 1X.

  In the present embodiment, a waterproof panel is used for the outer panel 40, and this waterproof panel is also used as a one-side formwork material for concrete placement performed when a peripheral wall for an underground structure is formed in a later step. It is also used, but this concrete will not be removed even after it is cured and cured. After the underground structure is built underground, underground water and rainwater penetrate the underground structure peripheral wall into the room. Used to prevent intrusion.

  The waterproof panel is, for example, a one-layer structure made of any one of vinyl chloride resin, polypropylene, ABS, epoxy resin, etc., or a single metal plate such as an aluminum plate or a coated steel plate, or these materials A commercially available waterproof panel having a thickness of about 50 mm, which is formed of a multi-layer board in which a plurality of layers are stacked, is used.

  Although not shown, a heat insulating panel may be used for the outer panel 40. The thermal insulation panel is also used as a formwork material on one side for placing concrete, which is performed when forming the peripheral wall for the underground structure in a later process, but it is not removed, and the peripheral wall for the underground structure is not removed. Part of it is laid underground. The heat insulation panel is used to suppress a room temperature drop in the underground structure due to the cold temperature of the soil in a cold district or winter after the underground structure is constructed underground.

  The heat insulation panel is, for example, one layer made of foamed resin or a plurality of layers made of different materials, a panel in which foamed plastic is held on a plastic plate, plastic sheet or metal thin plate, plastic plate, plastic sheet or metal thin plate A commercially available heat insulation panel having a thickness of about 50 mm is used.

  After the outer panel 40 is installed above the lower frame frame 1X, a reinforced structure 50 for constructing a peripheral wall for an underground structure made of reinforced concrete above the lower frame frame 1X surrounded by the outer panel 40. Arrange the bars.

  As shown in FIGS. 15 and 16, the reinforcing bar structure 50 corresponding to the peripheral wall for the underground structure includes an L-shaped reinforcing bar 51 for fixing bent in an L shape, and a long U shape bent in a U shape. It consists of a reinforcing bar 52, a horizontal bar 53 arranged horizontally along the circumferential wall direction, and a short bar bar 54 that supports the horizontal bar 53, and a large number of these reinforcing bars 51 to 53 are used and assembled.

  Among them, the fixing L-shaped reinforcing bars 51 are alternately arranged at different heights, and one end side 52a of the fixing L-shaped reinforcing bars 51 oriented in the horizontal direction is assembled from above the lower frame 1X. The bar is extended to the inside surrounded by the lower frame 1X, and used as a floor reinforcing bar when constructing a later reinforced concrete floor. The horizontal stripes 53 are provided in multiple stages at predetermined intervals in the vertical direction, two parallel bars 53 each in parallel.

  After assembling the outer panel 40 and the reinforced structure 50 above the lower frame 1X, the reinforced concrete made of reinforced concrete is placed above the lower frame 1X, which is a location along the inside of the reinforced structure type on the opposite side of the outer panel 40. Assemble the inner frame plate required when constructing the peripheral wall for underground structures by placing concrete.

  FIG. 17 is a partial perspective view partially including a cross-sectional portion showing a state in which the inner frame plate 41 is temporarily installed at a position along the inner side of the reinforcing bar structure 50 corresponding to the peripheral wall for the underground structure, and FIG. It is a fragmentary perspective view including a cross-sectional part in a part showing the state immediately after finishing placing concrete K in the space S1 between the inner panel and the inner panel.

  As shown in FIG. 17, the inner frame plate 41 is assembled and installed at an upper position along the horizontal plate portion 9 that is the inner position among the horizontal plate portions 8 and 9 of the lower frame frame body 1. Reference numerals 42, 43, 44, 45 are square members that support the inner frame plate 41 from the side surface side.

  When the inner frame member 41 is installed, as shown in FIG. 18, concrete K is placed in a space S1 surrounded by the outer panel, the inner frame plate 41, and the lower frame frame 1X. Then, after the cast concrete K is cured and cured, the inner frame plate 41 is removed. In this embodiment, the outer panel is left as it is. Thereby, the surrounding structure surrounding wall 60 is completed.

  FIG. 19 is a partial perspective view showing a part of an open-type caisson 61 in which a peripheral wall 60 for underground structure made of reinforced concrete is provided above the lower frame 1X. FIG. It is the perspective view shown in the state.

  As shown in FIG. 19, the open caisson 61 is obtained by integrally forming a peripheral structure peripheral wall 60 on the lower frame 1 </ b> X. In the lower part surrounded by the open caisson 61, each of the one end sides 51a, 51a,... Of the fixing L-shaped reinforcing bars 51 protrudes long in the horizontal direction. This hinders the excavation work to be performed afterwards, in which the open caisson 61 is laid underground. For this reason, each one end side 51a, 51a ... oriented to the horizontal direction of the fixing L-shaped reinforcing bar 51 is temporarily bent upward manually.

  As shown in FIGS. 19 and 20, the caisson 61 in this state is still on the low stage ground G1, and then the caisson 61 is excavated from the soil of the inner low stage ground G1 surrounded by the caisson 61. The caisson 61 is set in the basement by a so-called submersible method.

  Before starting the submergence work, the support member 21 supporting the peripheral wall 61 for the underground structure with the lower frame shown in FIG. 19 is removed. In order to prevent the caisson 61 from sinking and sinking smoothly, as shown in FIG. 20, a low-level ground G1 (actually, the concrete surface K1 is near the outer surface of the caisson 61). Corresponding to this), it is desirable that the guide rails GR and GR are erected in all directions.

  FIG. 21 is a front sectional view showing an example of construction in which an open caisson 61 is submerged by a submerged method, FIG. 22 is a simplified diagram showing the principle of a float type level P, and FIG. 23 is an open type It is the perspective view which showed the usage example of the laser marking device LS which confirms the inclination of the caisson 61 visually.

  As shown in FIG. 21, in the excavation of the inner soil surrounded by the open caisson 61, for example, a construction civil engineering machine M that is a mini excavator (mini yumbo) is used. Construction civil engineering machine M is suspended and transported to an inner low stage ground G1 surrounded by an open caisson 61 by a crane vehicle. When the construction civil engineering machine M is moved into the low ground G1 before the lower frame body (not shown in FIG. 21) 1 is installed, and then the lower frame body is installed on the low ground G1, the construction machine M Is placed on the inner low ground G1 surrounded by the caisson 61. As described above, the curing and hardening of concrete placed several times from the installation of the lower frame body to the completion of the caisson 61 is performed. In consideration of the number of days, it is more economical to hang the construction machine M to the inside of the open caisson 61 using a crane vehicle immediately before the work to set the open caisson 61 underground.

  In the work of excavating the inner soil surrounded by the caisson 61 shown in FIG. 21, the soil near the lower side of the open caisson 6 is scraped inward, and this work is performed along the open caisson 61. Do in order. When the soil is scraped to the near side in this way, the caisson 61 is pushed down by its own load, and the blade edge 4 at the lower part of the caisson 61 shears the lower ground, and the caisson 61 gradually It begins to sink gradually.

  When sinking the caisson 61, the caisson 61 is lowered and the inner soil is excavated in order to minimize the inclination of the caisson 61 due to the looseness of the ground at the blade edge 4 position and the soil disturbance of the ground. . Clay adheres to the outer peripheral surface of the blade edge 4 between the outer peripheral surface of the blade edge 4 and the sheared soil wall surface accompanying the sinking of the caisson 61 in the viscous soil, and a high frictional resistance is generated. In the caisson 61 according to the embodiment of the present invention, since the blade edge 4 is inclined in the direction in which the tip of the blade edge 4 is slightly outward, it is normal that the sinking is delayed. Since a slight gap is formed between the outer peripheral surface and the sheared soil wall surface, the frictional resistance generated between the outer peripheral surface of the blade edge 4 and the soil wall surface is greatly suppressed. For this reason, the open caisson 61 is smoothly sunk.

  The soil that has been scraped to the inside surrounded by the open caisson 61 is allowed to accumulate on the inner ground surrounded by the open caisson 61 for a while, thereby loosening the soil around the blade edge 4. In order to prevent the unevenness of the open caisson 61 and the inclination of the open caisson 61 caused by excessively disturbing the soil below the blade edge 4 as much as possible.

As for how to excavate the soil surrounded by open caisson 61, the surrounding environment such as caisson 61 size, weight, shape, geographical conditions, whether there are adjacent buildings or walls, etc. It depends on various conditions such as the convenience of the construction civil engineering machine M.
For example, by using a large excavator (large jumbo), a truck crane with a bottom-opening hopper, a construction civil machine such as a belt conveyor for waste soil, an air drill, or a device for injecting water (all not shown) You may excavate the soil. When the caisson 61 is relatively small, it is possible to excavate manually, and when the caisson 61 is large, a bottom frame is attached while forming a tunnel in the soil below the open caisson 61. One method is to employ a so-called tunnel construction method in which the peripheral wall 61 for the underground structure sinks downward.
The caisson 61 is gradually subsidized underground by any one or a plurality of constructions.

For example, as shown in FIG. 21, the level of the caisson 61 is set at an appropriate height of each inner wall of the caisson 61. This is done by visual inspection of the vessel LB.
A level pipe LB shown in FIG. 21 is a transparent pipe branched upward from a plurality of locations with predetermined intervals of pipes P1 mounted in the horizontal direction with the same height all around the inner surface of the caisson 61. P2, P3, P4, and P5 are attached to each surface of the inner wall of the caisson 61, and inside the transparent pipes P2, P3, P4, and P5 in the spaces that communicate with the transparent pipes P2, P3, P4, P5 and the pipe P1. Water is put to about half the height, floats P6, P7, P8, P9 are put in the transparent pipes P2, P3, P4, P5, and the upper ends of the transparent pipes P2, P3, P4, P5 are opened. Of a structured structure. If the transparent pipes P2, P3, P4, and P5 are graduated, it is better.

  As shown in FIG. 22, when the float type level P is tilted, the positions of the floats P6, P8, and P9 with respect to the transparent pipes P2, P4, and P5 change. By checking the scales of P6, P8, and P9 and the transparent pipes P2, P4, and P5, the ground can be excavated while correcting the inclination of the open caisson 61 shown in FIG.

  In addition to this, for example, as shown in FIG. 23, a marking line LR irradiated on the inner peripheral wall surface of the open caisson 61 using a laser marking unit LS that irradiates a horizontal marking line by laser light. There is also a method in which the position of the mark on the inner peripheral wall of the caisson 61 is visually checked for comparison. Some laser marking devices irradiate a vertical vertical marking line (tachi line) forward, and this type of laser marking device may be used. For example, products manufactured by Tajima Tool Co., Ltd., Hitachi Koki Co., Ltd., and the like have been commercially available.

  FIG. 24 is a perspective view showing a state in which the open caisson 61 is sunk to a position in the middle of the underground, FIG. 25 is a perspective view showing a state in which the open caisson 61 has been sunk to the basement, and FIG. It is the partial front sectional view which expanded and showed the part.

  As shown in FIG. 24, when the caisson 61 is gradually submerged as much as possible and subsidized to the depth shown in FIGS. 25 and 26, the operation of subsiding the caisson 61 is completed.

  After caisson 61 has been laid underground, construction work around the outside of the space surrounded by caisson 61, floor construction, stair construction, ceiling construction, electrical construction, interior construction, etc., will be continued.

  As shown in FIG. 26, the lower frame 1 </ b> X is slightly outside the peripheral structure peripheral wall 60 between the soil wall surface formed by the caisson 61 sinking and the peripheral surface of the underground structure peripheral wall 60. Since it protrudes, a gap S3 is generated, but this gap S3 is filled with ballast (crushed stone) V1.

  It is desirable to lay a strong plate Q that prevents the caisson 61 from further sinking under the caisson 61 that has finished sinking. And it is preferable that the horizontal posture of the caisson 61 is stabilized by interposing a jack J between the plate Q and the middle plate portion 6 located at a midway height of the reinforced lower frame frame main body 1A. The inner ground surrounded by the caisson 61 is flattened and then filled with pennite powder PN in the lower space near the tip of the blade 4.

  Then, ballast (crushed stone) V <b> 2 is laid on the inner soil surface surrounded by the caisson 61, leaving a portion other than the lower side along the blade edge 4. After that, the concrete bottom board FL is constructed.

  Before the concrete floor FL is constructed, each end 51a of the fixing L-shaped reinforcing bar 51 bent upward is folded back in the original lateral direction. Thereafter, concrete K is placed on the inner ground surrounded by the caisson 61. In this placement, the concrete K is made to reach the space below the caisson 61.

  Thereafter, the bottom plate reinforcing bars 55 are laid in the matrix direction on the concrete surface that has been placed, and the one end side of the fixing L-shaped reinforcing bar 51 and the bottom plate reinforcing bar 55 that are oriented in the lateral direction are made of concrete K. The concrete K is cast until it is buried, and finally, the upper surface of the concrete K is leveled flat, and when the concrete K is cured and hardened, the concrete bottom plate FL is completed.

  How to carry out the construction work such as staircase work, ceiling work, electrical work, interior work, etc. that will be performed after this will differ depending on the construction project, but basically it is the same as the work for conventional underground structures. It is performed by the construction method.

  FIG. 28 is a perspective view showing one step of the construction method of the peripheral wall for the underground structure according to the second embodiment of the present invention.

  The underground structure constructed underground in the construction shown in FIG. 28 is a large steel tank made of steel plate whose outer peripheral surface is painted with paint, and 70 indicates an open caisson that is a peripheral wall of this water tank. Hereinafter, the caisson 70 will be referred to as a water tank caisson 70.

  The aquarium caisson 70 is assembled on the ground, and then submerged by a submerged construction method. FIG. 28 shows a state before the water tank caisson 70 is submerged in the ground. In this construction as well, a shallow low-level ground G1 is first created on the ground G by the same method as described above. Then, the aquarium caisson 70 is assembled on the low stage ground G1.

  FIG. 29 is a front cross-sectional view showing a part of the upper stage portion 71 and the lower stage portion 72 constituting the water tank caisson 70.

  As shown in FIG. 28 and FIG. 29, the water tank caisson 70 is constituted by an upper part 71 and a lower part 72 that are joined together in a vertical manner. Both the upper part 71 and the lower part 72 of the aquarium caisson 70 have elliptical outer peripheral walls 71a and 72a, and reinforcing ribs 71b to 71f and 72b to 72e oriented horizontally on any inner wall. And reinforcing ribs 71g and 72g oriented in the vertical direction are formed.

  The horizontally oriented reinforcing rib 72e located at the lowermost part of the lower part 72 is formed to be narrower than the upper reinforcing ribs 72b to 72d, and the aquarium caisson 70 is submerged underground by the above-described submerged method. At this time, the resistance applied by the ground soil toward the lower portion of the water tank caisson 70 is reduced. For this reason, also in this open tank caisson 70, the ground is sheared by the lower end of the caisson during submergence.

  Between the reinforcing rib 72f positioned at the lowermost stage of the lower stage portion 72 and the reinforcing rib 72d positioned one level above, when the aquarium peripheral wall 70 is submerged by the submerged construction method, resistance from the soil is applied from below. Thus, the reinforcing ribs 72f in the vertical direction are formed at predetermined intervals so that the reinforcing ribs 72c oriented in the horizontal direction are not deformed upward.

  FIG. 30 is a front cross-sectional view showing a state before the aquarium caisson 70 is submerged underground by the submerged method.

  As shown in FIG. 30, the aquarium caisson 70 is installed on the low stage ground G1 in a state where the upper stage part 71 and the lower stage part 72 are assembled and integrated. When the aquarium caisson 70 is large, the lower part 72 is installed in a horizontal posture on the lower stage ground G1, and after the lower part 72 is submerged halfway underground, These end faces may be fixed together by welding or using bolts and nuts, and the remaining settlement may be continued.

  When the water tank open-type caisson 70 is integrated by being assembled in two upper and lower stages, the outer periphery of the lower part 72 is formed larger than the outer periphery of the upper part 71, and the water tank caisson 70 is submerged in the basement. The outer peripheral wall 71a of the upper portion 71 and the soil wall surface are prevented from rubbing with a large frictional force. In this way, the subsidence of the water tank caisson 70 toward the basement is performed smoothly and easily.

  A so-called submersible method, which is a construction for sinking the aquarium caisson 70 to the ground, is performed by excavating the inner soil surrounded by the aquarium peripheral wall 70 as in the case of the above-described embodiment. The excavation is performed by the method described in the above embodiment.

  When the aquarium caisson 70 is large, the upper part 71 may be assembled on the lower part 72 after the lower part 22 is largely submerged.

  FIG. 31 is a partial front cross-sectional view showing a state after the water tank peripheral wall 70 is sunk in the basement, and FIG. 32 is a perspective view similarly viewed from obliquely above.

  When the aquarium caisson 70 is submerged to the position shown in FIGS. 31 and 32, the outer peripheral wall 71a of the lower step portion 72 is interposed between the outer peripheral wall 71a of the upper step portion 71 and the soil side wall as shown in FIG. A gap V <b> 2 formed by the settlement of the soil due to is formed, and this gap V <b> 2 is filled with ballast (crushed stone) or concrete. You may make it cover the outer peripheral wall 71a with the heat insulation sheet (not shown) which suppresses the freezing of the water in the water tank by the fall of air temperature, the temperature rise in the water tank by the temperature rise, etc. for the outer peripheral wall 71a.

  In order to eliminate further subsidence of the water tank caisson 70 that has been submerged to the underground, concrete K is placed and reinforced below the water tank open caisson 70 in the same manner as in the above-described embodiment. Then, when a lid (not shown) is put on the water tank caisson 70, the ground water tank is completed.

  And in the underground structure which concerns on this invention, it is an underground structure obtained by the construction method of the underground structure which concerns on the above-mentioned this invention.

FIG. 1 is a perspective view showing an installation example of a lower frame frame body performed before the peripheral wall for an underground structure according to the first embodiment of the present invention is submerged into the basement. FIG. 2 is a perspective view showing an example of the low-level ground on which the lower frame is installed. FIG. 3 is a plan view showing an example of the overall shape of the lower frame frame main body. FIG. 4 is a front sectional view showing a part of the lower frame body. FIG. 5 is a partial front sectional view showing that the outer peripheral side plate portion of the lower frame frame main body has an inclination angle. FIG. 6 is a front sectional view showing another embodiment of the inclined structure of the outer peripheral side plate portion in the lower frame frame main body. FIG. 7 is a front sectional view showing another embodiment of the inclined structure of the outer peripheral side plate portion in the lower frame frame main body. FIG. 8A is a perspective view showing an example of a split frame at a corner portion constituting a part of the lower frame body. FIG. 8B is a partial side sectional view showing an example of joining adjacent divided frames. FIG. 9A is a front sectional view showing a divided frame according to another embodiment. FIG. 9B is a front sectional view showing a divided frame according to still another embodiment. FIG. 10 is a front sectional view showing a divided frame according to still another embodiment. FIG. 11A is a partial perspective view showing a state in which the lower frame frame main body is installed on the low-level ground by being assembled and integrated into the frame structure. FIG. 11B is a front sectional view showing the same. FIG. 12A is a partial perspective view showing an example in which reinforcing bars are arranged in the lower frame frame main body. FIG. 12B is a front sectional view of the same. FIG. 13A is a partial perspective view showing a state after the concrete K is placed in the lower frame frame main body. FIG. 13B is a front sectional view of the same. FIG. 14 is a front partial sectional view showing a lower frame frame having another internal structure together with another support structure. FIG. 15 is a front partial sectional view showing a construction example in which an outer panel plate and a reinforcing bar structure corresponding to the peripheral wall for the underground structure are provided above the lower frame. FIG. 16 is a partial perspective view showing an example of a reinforcing bar structure for forming a reinforcing bar structure corresponding to a peripheral wall for an underground structure. FIG. 17 is a partial perspective view including a cross-sectional portion in a part of a state in which an inner frame plate is temporarily installed at a position along the inner side of the reinforcing bar structure corresponding to the peripheral wall for the underground structure. FIG. 18 is a partial perspective view including a cross-sectional portion in a part showing a state immediately after the concrete has been placed in the space between the outer panel and the inner panel. FIG. 19 is a partial perspective view including a cross-sectional portion in a part of an open-type caisson in which an underground structural peripheral wall made of reinforced concrete is provided above the lower frame. FIG. 20 is a perspective view showing the same state before sinking. FIG. 21 is a front cross-sectional view showing an example of construction in which an open-type caisson is sunk underground by a submerged method. FIG. 22 is a simplified diagram showing the principle of the float level. FIG. 23 is a perspective view showing an example of use of a laser marking device that visually confirms the inclination of an open caisson. FIG. 24 is a perspective view showing a state in which an open caisson is sunk to a position in the middle of the basement. FIG. 25 is a perspective view showing a state in which an open caisson has been sunk to the basement. FIG. 26 is a partial front sectional view showing an enlarged part of the same. FIG. 27 is a perspective view showing one step of the construction method of the peripheral wall for the underground structure according to the second embodiment of the present invention. FIG. 28 is a front cross-sectional view showing a part of an upper stage portion and a lower stage portion constituting an open caisson for a water tank. FIG. 29 is a front cross-sectional view showing a state before an aquarium open caisson is submerged underground by a submerged method. FIG. 30 is a partial front cross-sectional view showing a state after the aquarium caisson has been laid down underground. FIG. 31 is a perspective view similarly viewed from obliquely above.

Explanation of symbols

G Ground G1 Low-level ground D Depth F Height position FL Concrete bottom GR Guide rail H1 Height K Concrete K1 Concrete surface K2 Concrete surface LS Laser marking machine M Construction civil engineering machine P Floating level spirit Q Plate R Inclination angle R1 Inclination angle S Internal space S1 space S3 Clearance T Ballast U plate V1 Ballast (crushed stone)
V2 Ballast
W1 width Y sheet pile

DESCRIPTION OF SYMBOLS 1 Lower frame frame main body 1A Divided frame 1B Divided frame 1X Lower frame frame 1Y Lower frame frame 2 Outer peripheral side plate part 3 Inclined plate part 4 Cutting edge 6 Middle stage bottom plate part 7 Plate part 8 Horizontal flat plate part 9 Horizontal flat plate part 10 Opening part 11 Joint Plate part 20 Support member 21 Support member 31 Lower frame frame reinforcement (rebar)
32 Lower frame frame reinforcement (rebar)
33 U-shaped rebar 34 Seat plate 36 L-shaped rebar 37 Bar-shaped rebar

40 Outer panel 41 Inner frame plate 50 Reinforcing bar structure 51 L-shaped reinforcing bar for fixing 51a One end side 52 Long U-shaped reinforcing bar 53 Horizontal bar 54 Short bar bar

60 Peripheral wall for underground structure 61 Open caisson 70 Water tank caisson 71 Upper part 72 Lower part 72b-7e Horizontal rib 72f Reinforcement rib

101 Lower frame body 102 Lower frame body 103 Divided frame 104 Divided frame 105 Divided frame 106 Divided frame 107 Divided frame

Claims (15)

Starting from the production of the lower frame frame with the blade edge facing downward, an open-type caisson having a peripheral wall for an underground structure was produced on the lower frame frame, and the inner soil surrounded by the caisson was made. In the construction method of the underground structure in which the remaining construction for constructing the underground structure having the peripheral wall for the underground structure is performed after excavating and sinking the caisson underground,
The lower frame frame is manufactured to the extent that a plurality of reinforcing bars are arranged in the inner space of the lower frame frame main body and at least most of the inner space is buried after the lower frame frame main body made of steel plate is manufactured. An underground structure characterized in that it is performed by placing concrete and curing and curing the concrete, and after the production of the lower frame frame, construction for providing a peripheral wall for the underground structure is performed on the lower frame frame. Construction method. As the lower frame frame, a lower frame frame having a structure in which a part of the reinforcing bar or a part of the long bolt protrudes long from the inside of the lower frame frame with a predetermined interval is used. The construction method of the underground structure of claim | item 1. The lower frame frame body made of steel plate that forms the outer shape of the lower frame frame includes an outer peripheral side plate portion that forms an outer peripheral surface along the frame direction of the lower frame frame, and a location along the lower edge of the outer peripheral side plate portion. An inclined plate portion provided toward the middle position obliquely above and away from the outer peripheral side plate portion, and an intermediate bottom plate portion provided further in the lateral direction from a position along the inner edge of the inclined plate portion; The outline shape is formed by the inner peripheral side plate portion provided upward from the location along the inner peripheral edge of the middle-stage bottom plate portion, and the cutting edge is formed by the outer peripheral side plate portion and the inclined plate portion, And the construction method of the underground structure of Claim 1 or 2 in which the lower frame frame main body which has the shape which made the upper end opened large is used. The lower frame frame main body made of a steel plate that forms the outer shape of the lower frame frame has an outer peripheral side plate portion that forms the outer peripheral surface of the lower frame frame main body from the upper edge of the outer peripheral side plate portion or a position at a midway height to the lower edge. The construction method of an underground structure according to any one of claims 1 to 3, wherein a lower frame frame body having a shape inclined outward with an inclination angle of 1 to 5 ° is used. The lower frame frame main body made of a steel plate that forms the outer shape of the lower frame frame includes lateral plates facing each other at the upper edge of each of the outer peripheral side plate portion and the outer peripheral side plate portion constituting the partial surface of the lower frame frame main body or at the middle portion. The construction method for an underground structure according to any one of claims 1 to 4, wherein a lower frame frame having a structure in which narrow horizontal plates directed in a direction are integrally formed. The lower frame frame body made of a steel plate forming the outer shape of the lower frame frame is joined to a plurality of divided frames having a length that divides the circumferential frame direction in the circumferential frame direction. The construction method of an underground structure according to any one of claims 1 to 5, wherein a lower frame frame having a shape in which a joining plate portion is formed in a direction to block an internal space of the frame frame main body is used. The lower frame frame body made of a steel plate that forms the outer shape of the lower frame frame stands upward from the inner middle surface of the inclined plate portion or middle plate portion of the lower frame frame body toward the internal space of the lower frame frame body. The construction method of an underground structure according to any one of claims 1 to 6, wherein a lower frame frame body having a shape in which a reinforcing plate portion to be provided is formed. The construction method of the underground structure according to any one of claims 1 to 7, wherein after the waterproof panel is provided on the outer peripheral surface of the peripheral wall for the underground structure, the underground wall for the underground structure is installed in the basement. . The construction method for an underground structure according to claim 8, wherein a waterproof panel provided on an outer peripheral surface of the peripheral wall for an underground structure is also used as an outer peripheral formwork for placing concrete when manufacturing the peripheral wall made of reinforced concrete. The construction method for an underground structure according to any one of claims 1 to 7, wherein after the heat insulation panel is provided on the outer peripheral surface of the peripheral wall for the underground structure, the underground wall for the underground structure is sunk in the basement. . The construction method of the underground structure of Claim 10 which uses the heat insulation panel provided in the outer peripheral surface of the surrounding wall for underground structures also as an outer peripheral side formwork for concrete placement at the time of manufacture of the said reinforced concrete surrounding wall. Starting from the production of the lower frame frame with the blade edge facing downward, an open-type caisson having a peripheral wall for an underground structure was produced on the lower frame frame, and the inner soil surrounded by the caisson was made. In the construction method of the underground structure in which the remaining construction for constructing the underground structure having the peripheral wall for the underground structure is performed after excavating and sinking the caisson underground,
The caisson is composed of an upper part and a lower part, and the lower part is first submerged to the middle of the underground by a submerged method, and then the upper part is constructed on the lower part and the remaining subsidence is performed. The construction method of the characteristic underground structure. Starting from the production of the lower frame frame with the blade edge facing downward, an open-type caisson having a peripheral wall for an underground structure was produced on the lower frame frame, and the inner soil surrounded by the caisson was made. In the construction method of the underground structure in which the remaining construction for constructing the underground structure having the peripheral wall for the underground structure is performed after excavating and sinking the caisson underground,
In the caisson, the wall surface is formed of a steel plate, the reinforcing rib is formed along the inner wall surface of the wall surface, and the reinforcing rib oriented in the horizontal direction located at the bottom is formed narrower than the other reinforcing ribs. A method for constructing an underground structure, wherein a caisson having a structured structure is used. Starting from the production of the lower frame frame with the blade edge facing downward, an open-type caisson having a peripheral wall for an underground structure was produced on the lower frame frame, and the inner soil surrounded by the caisson was made. In the construction method of the underground structure in which the remaining construction for constructing the underground structure having the peripheral wall for the underground structure is performed after excavating and sinking the caisson underground,
The caisson is composed of an upper part made of steel plate and a lower part made of steel plate. First, the lower part is submerged to the middle of the underground by a submerged method, and then the upper part is constructed on the lower part, and the rest A construction method for underground structures characterized by subsidence. The underground structure obtained by the construction method of the underground structure of any one of Claims 1 thru | or 14.

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