TWI790741B - Retaining wall and its construction method - Google Patents

Abstract

The object of the present invention is to provide a retaining wall and its construction method, which minimizes the reduction of the flat land used for building buildings, can be constructed on site in a short period of time and easily, and can reliably and long-term maintain the horizontal component of the earth pressure. support. The retaining wall system includes: a plurality of supporting piles 2, each having a columnar part formed by cement slurry in the foundation, and an H-shaped steel 6 whose lower part is arranged inside the columnar part and whose upper part is exposed from the columnar part; Member 3 is a shaped steel having a beam web, a first flange formed on one end side of the beam web, and a second flange formed on the other end side of the beam web. The beam web is arranged approximately horizontally, and the first flange The edge is fixed to the H-shaped steel 6 of the support pile 2; and the wall member 4 is formed of reinforced concrete, arranged along the H-shaped steel 6 of a plurality of support piles, and fixed to the support pile 2 through the connecting structure 3 buried inside, Horizontal components subjected to earth pressure.

Description

Retaining wall and its construction method

The invention relates to a retaining wall and its construction method.

A retaining wall is a structure that withstands the soil pressure of land with a difference in height such as cut soil or piled soil, and prevents the land from disintegrating. There are known stone retaining walls using square cone-shaped stones (kenchiishi stone) or inverted T Shaped, L-shaped or inverted L-shaped cantilever retaining walls, etc.

In addition, among the retaining walls, as shown in the following Patent Document 1, there is a retaining wall having a structure in which a row of piles (support piles) of a plurality of H-shaped steel piles driven at predetermined intervals is supported by anchors or Metal joint members such as tension bolts are used to support precast concrete wall panels.

[Prior Art Literature]

[Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2009-162029.

Stone retaining walls and cantilever retaining walls, which are conventional construction methods, have the following problems in addition to time-consuming and cost-intensive construction. In other words, the stone retaining wall must set the slope on which the stone is laid to be 65° or less with respect to the horizontal plane, so that the level land that can be secured is reduced compared to the case where the step of the land is set as a vertical plane. For example, in the case of building a stone retaining wall with a height of 5m, a setback of about 3m is required. In addition, stone retaining walls made of square pyramidal stones are prohibited to exceed a height of 5m. and then, The operation of stacking the square cone-shaped stones one by one is heavy physical labor. In recent years, the number of specialized operators has decreased, making it difficult to build.

In the case of a cantilever retaining wall, a base plate that protrudes forward or backward from the vertical surface of the vertical wall is buried in the ground, so the foundation of the building cannot be placed in the area that interferes with the base plate. Therefore, land that cannot be used for buildings occurs on the front (front) side or rear (back) side of the retaining wall, and there is a problem that the land cannot be used effectively in cities and the like. In addition, in the case of an L-shaped cantilever retaining wall, a construction space excavated with a temporary retaining wall is required on the rear side of the retaining wall, so the place where the retaining wall can be installed is limited, or it cannot be used for buildings. land. For example, in the case of constructing an L-shaped cantilever retaining wall with a height of 5m, it is necessary to move back 5m.

In the case of the technology described in Patent Document 1, when the support pile is combined with a concrete wallboard by means of anchors or tension bolts, etc., the anchor or tension bolt is connected to the back side of the wallboard and the support pile. Bolts, etc. Therefore, it is necessary to excavate the rear side of the support pile to ensure construction space (temporary scaffolding installation space or work space, etc.). Therefore, the place where the retaining wall can be installed may be limited, or land that cannot be used for buildings may arise.

In addition, the connection between the concrete wall panels and the joint members is pre-formed on the wall panels before the on-site construction, and cannot be constructed afterwards. Therefore, in order to install the wall panels in the desired orientation or position with respect to the support piles, it is necessary to drive the support piles on site with high precision, and it is very difficult to install the retaining wall using the high-quality concrete wall panels. Furthermore, since metal members such as anchors and tension bolts are in direct contact with soil, there is a possibility that the bonding strength may be reduced due to corrosion. Moreover, the delivery date of concrete wall panels sometimes depends on the arrangement of the manufacturer's factory, so it may not be possible to install a retaining wall on site during the necessary period.

The present invention is made in view of this situation, and its purpose is to provide a retaining wall and its construction method, which minimizes the flat land used for building buildings, can be constructed on site in a short period of time and easily, and is suitable for soil The horizontal component of the pressure can be reliably and long-term supported.

In order to solve the above-mentioned problems, the retaining wall and its construction method of the present invention employ the following means.

That is, the retaining wall of the present invention is provided with: a plurality of support piles, each having a columnar portion formed by cement milk in the foundation, and the lower portion is arranged inside the columnar portion, and the upper portion is formed from the aforementioned columnar portion. H-shaped steel exposed at the columnar portion; a connecting member having a web, a first flange formed on one end side of the web, and a second flange formed on the other end side of the web The beam webs are substantially horizontally arranged, the first flange is fixed to the H-shaped steel of the supporting piles; and the wall member is formed of reinforced concrete along the H-shaped steel of the plurality of supporting piles. It is configured to be fixed to the aforementioned support piles via the aforementioned connecting components buried inside, and bear the horizontal component of the earth pressure.

According to this configuration, each of the plurality of support piles has a columnar part and an H-shaped steel. The columnar part is formed of cement slurry in the foundation, the lower part of the H-shaped steel is arranged inside the columnar part, and the upper part of the H-shaped steel is formed from the column. The shape is exposed. The connecting member is a shaped steel having a web, a first flange formed on one end side of the web, and a second flange formed on the other end side of the web, and the web is arranged approximately horizontally, and the first flange H-shaped steel fixed to support piles.

In addition, the wall members are made of reinforced concrete, arranged along the H-shaped steel of a plurality of supporting piles, and connecting members are buried inside, and are fixed to the supporting piles through the connecting members to withstand the horizontal component of earth pressure. A connecting member is embedded in the wall member made of reinforced concrete, and the wall member is fixed to the supporting pile through the connecting member, thereby having a composite structure in which the supporting pile and the wall member are integrated. Wall members bear The horizontal component of earth pressure transmits force to the upper H-shaped steel of the supporting pile and the lower part of the supporting pile through the connecting structure.

In the above-mentioned retaining wall, it is preferable that the reinforcing bars of the aforementioned reinforced concrete forming the aforementioned wall member are fixed to the aforementioned connecting member.

According to this structure, the steel bar of the reinforced concrete which forms a wall member is fixed to a connection member, and the stress applied to a wall member is reliably transmitted to a supporting pile via a connection member.

In the above-mentioned retaining wall, it is preferable that the above-mentioned section steel of the above-mentioned connection structure is a channel-shaped steel, I-shaped steel or H-shaped steel manufactured by hot rolling.

According to this configuration, the steel of the connecting structure is channel steel, I-shaped steel, or H-shaped steel manufactured by hot rolling. Unlike cast products, it is stable without uneven strength between products, so the retaining wall The structural design is easy, and the strength of the required retaining wall can be reliably ensured.

In the above retaining wall, preferably, the H-shaped steel of the support pile and the connecting member are fixed to each other by joining by welding or joining by high-strength bolts.

According to this configuration, since the connecting member is the H-shaped steel fixed to the support pile by welding or joining with high-strength bolts, the connecting member can be easily fixed at the construction site.

The construction method of the retaining wall of the present invention comprises the following steps: setting a plurality of support piles, the plurality of support piles respectively have a columnar portion formed by cement slurry in the foundation, and a columnar portion arranged at the bottom of the columnar portion. The H-shaped steel whose inner and upper parts are exposed from the aforementioned columnar part; the aforementioned first flange, which is a connecting structure of shaped steel, having a beam web, a first flange, and a second flange, is fixed to the aforementioned H-shaped steel of the aforementioned support pile. steel such that the web of the connecting structure is substantially horizontally arranged, wherein the first flange is formed on one end side of the web, and the second flange is formed on the other end side of the web; The method of fixing the aforementioned connecting structure buried inside to the aforementioned supporting piles is along the plurality of aforementioned support piles. The aforementioned H-shaped steel supporting the piles is configured with a wall member which bears the horizontal component of the earth pressure and is formed of reinforced concrete.

According to the present invention, the land for constructing the building can be minimized, the construction can be easily carried out on site in a short period of time, and the horizontal component of the earth pressure can be supported reliably and for a long time.

1: retaining wall

2: Support pile

3: Connecting components

4: Wall components

5: columnar part

6: H-shaped steel

7: steel bars

7a: Horizontal reinforcement

7b: Longitudinal reinforcement

8: Base beam

9: High-strength bolts

10: Inclined washer

11: Through hole

[ Fig. 1 ] is a front view showing a retaining wall according to an embodiment of the present invention.

[ Fig. 2 ] is a longitudinal sectional view showing a retaining wall according to an embodiment of the present invention.

[ Fig. 3 ] is a plan view showing a retaining wall according to an embodiment of the present invention.

[ Fig. 4 ] is a longitudinal sectional view showing a connecting member of a retaining wall according to an embodiment of the present invention.

[ Fig. 5 ] is a cross-sectional view showing a connecting member of a retaining wall according to an embodiment of the present invention.

[ Fig. 6 ] is a front view showing a connecting member of a retaining wall according to an embodiment of the present invention.

[ Fig. 7] Fig. 7 is a longitudinal sectional view showing a modified example of a connecting member of a retaining wall according to an embodiment of the present invention.

[ Fig. 8] Fig. 8 is a cross-sectional view showing a modified example of a connecting member of a retaining wall according to an embodiment of the present invention.

[ Fig. 9 ] is a front view showing a modified example of a connecting member of a retaining wall according to an embodiment of the present invention.

[ Fig. 10 ] is a partially enlarged longitudinal sectional view showing a modified example of a connecting member of a retaining wall according to an embodiment of the present invention.

Hereinafter, a retaining wall 1 according to an embodiment of the present invention will be described with reference to the drawings.

A retaining wall 1 according to an embodiment of the present invention is a structure that withstands the soil pressure of land with a difference in height, such as cut soil or piled soil, and prevents the land from collapsing. According to this embodiment, the flat land available on the front (front) side or rear (back) side of the retaining wall 1 is not reduced, and the retaining wall 1 can be constructed on site easily and in a relatively short period of time.

For example, as shown in FIGS. 1 to 6 , the retaining wall 1 of the present embodiment includes support piles 2 , connection members 3 , wall members 4 , and the like. As shown in Fig. 4 and Fig. 5, a connecting member 3 is embedded in the wall member 4 formed by reinforced concrete, and the wall member 4 is fixed to the supporting pile 2 through the connecting member 3, so that the supporting pile 2 and the wall member 4 are integrated. Synthetic structure of chemistry. The wall member 4 bears the horizontal component of the earth pressure, and transmits force to the H-shaped steel 6 on the upper part of the supporting pile 2 and the lower part of the supporting pile 2 through the connecting member 3 .

As shown in FIGS. 1 to 3 , the support pile 2 has, for example: a columnar portion 5 formed by cement slurry in the foundation; and an H-shaped steel 6 fixed to the columnar portion 5 . The support pile 2 is fixed in the foundation by cement slurry construction method to stabilize the foundation, and the axis of the support pile 2 is installed in a vertical direction. The lower part of the H-shaped steel 6 is arranged inside the columnar part 5 , and the upper part of the H-shaped steel 6 is exposed from the columnar part 5 . The cement slurry is produced by mixing soil, water, cement, and bentonite mixed solution, for example, using a mixing facility at a construction site.

The supporting pile 2 is buried in the ground at the lower end side, and the lower end is fixed to the supporting layer of the foundation. A plurality of support piles 2 are arranged at intervals along the wall surface of the formed wall member 4 . The distance between the support piles 2 is, for example, 2000 mm. The support pile 2 is fixed with a wall member 4 via a connecting member 3 at the upper part. In the portion to which the wall member 4 is fixed, the H-shaped steel 6 is exposed without being covered with the columnar portion 5 formed of cement paste. That is, the upper part of the support pile 2 that has transmitted the earth pressure from the wall member 4 is subjected to force by the H-shaped steel 6, and the transmitted force is transmitted to the lower part of the support pile 2 buried in the ground.

The H-shaped steel 6 is a shaped steel manufactured by hot rolling, and has a beam web and two flanges parallel to each other. The support pile 2 is designed in such a way that the plate surface of the flange of the H-shaped steel 6 is parallel to the wall surface of the wall member 4 place. H-shaped steel 6 is based on JIS (Japanese Industrial Standards; Japanese Industrial Standards) and other standard products. The size of H-shaped steel 6 is, for example, the standard section size H×B of 250×250, 300×300, 350×350, 400× 400 etc.

In one supporting pile 2, multiple H-shaped steels 6 can also be connected in the axial direction. The H-shaped steels 6 are joined together by, for example, high-strength bolts.

A plurality of connection members 3 are fixed to the flange of the H-shaped steel 6 by welding or high-strength bolts. Thereby, the H-shaped steel 6 and the connecting structure 3 are in surface contact, so the transmission of force between the H-shaped steel 6 and the connecting structure 3 is carried out through the surface. The fixing of the H-shaped steel 6 and the connecting member 3 will be described later.

The connecting member 3 is an H-shaped steel 6 fixed to each support pile 2, and is embedded in the wall member 4 so that the support pile 2 and the wall member 4 are integrated. The connecting member 3 is a shaped steel manufactured by hot rolling, and is, for example, a standard product based on JIS. In the case of hot-rolled steel, the connecting member 3 is different from the cast product, and it is stable without uneven strength between products. Therefore, the structural design of the retaining wall 1 is easy, and the required retaining wall can be reliably ensured. 1 strength. The connection member 3 is formed by cutting a shaped steel into a length of about 50 mm, for example.

The shaped steel is, for example, a channel steel, an H-shaped steel (narrow width), or an I-shaped steel, and has a web and two flanges respectively formed on one end side and the other end side of the web. In the case of channel steel, the standard section size H×B is 150×75, 180×75, 200×80, etc. In the case of H-shaped steel (narrow width), the standard section size H×B, beam web thickness t1, and flange thickness t2 are: 150×75, 5, 7; 175×90, 5, 8; 200×100 , 5.5, 8, etc.

The connecting structure 3 is fixed in a cantilever state relative to the support pile 2 . The flange (first flange) on one side of the connecting member 3 is fixed to the support pile 2, and the web is arranged approximately horizontally. The flange (first flange) on the side fixed to the support pile 2 becomes the fixed end side flange, and the flange (second flange) on the side protruding from the support pile 2 becomes the free end side flange. In the case of channel steel, it is arranged so that the top end of the free end flange faces upward.

A plurality of connection members 3 are provided at intervals above the H-shaped steel 6 of the support pile 2 , and each connection member 3 transmits force between the support pile 2 and the wall member 4 . The distance between the connecting members 3 is, for example, about 200 mm to 300 mm. When the height of the wall member 4 is 6000 mm, about 20 to 30 connecting members 3 are provided on one H-shaped steel 6 . Preferably, the distance between the connecting members 3 is different according to the earth pressure that the wall members 4 are subjected to. For example, the connecting members 3 in the lower part of the wall member 4 are narrower from each other than in the upper part.

Moreover, the connection member 3 is being fixed to each support pile 2 so that it may become the same height in the horizontal direction among all the support piles 2. As shown in FIG. The reinforcement bars 7 of the wall members 4 are placed in the horizontal direction on the horizontal beam webs of the plurality of connection members 3 having the same height, and the reinforcement bars 7 are bound to the connection members 3 . Thereby, force can be transmitted between the connecting member 3 and the reinforcement bar 7 of the wall member 4 , and the stress applied to the wall member 4 is reliably transmitted to the support pile 2 through the connecting member 3 .

On the horizontal web of the connecting member 3, for example, two steel bars 7 of the wall member 4 are placed. As the joint structure of the shaped steel, the 3 series are fixed in shape. Therefore, in the state where the connecting structure 3 is fixed to the flange of the H-shaped steel 6 of the support pile 2, the angle of the steel bar 7 placed on the web of the connecting structure 3 with respect to the flange surface of the H-shaped steel 6 is the same as The setting position is fixed regardless. In addition, when arranging the reinforcement bars 7 of the wall members 4, the reinforcement bars 7 can be arranged in the horizontal direction only by placing the reinforcement bars 7 of the wall members 4 on the plurality of connection members 3, so that the reinforcement arrangement operation is easy. Furthermore, on the horizontal web of the connecting structure 3, it is easy to arrange the reinforcing bars 7 with a predetermined distance therebetween, so that the spacing between the reinforcing bars 7 can be accurately maintained.

When the connecting member 3 is channel-shaped steel, if the top end of the flange is arranged upward, the steel bar 7 is stuck on the flange and is not easy to fall, so it is easy to carry out the reinforcing bar arrangement operation of the wall member 4 . In addition, this invention is not limited to this example, In the case of a channel steel, you may arrange|position so that one end part of a flange may face down.

The wall element 4 is a horizontal component that is in contact with the soil and bears the earth pressure. The wall member 4 is made of reinforced concrete, and is installed along the plurality of support piles 2 . The wall surface of the wall member 4 is formed vertically with respect to the horizontal plane. The thickness of the wall member 4 is determined according to the earth pressure that the wall member 4 bears. The thickness of the wall member 4 is, for example, about 200 mm to 250 mm. The design reference strength of concrete is, for example, Fc24. In this embodiment, unlike the conventional cantilever type retaining wall, the bottom plate vertical to the wall member 4 is not formed.

The wall member 4 is integrated with the supporting pile 2 by embedding the connecting member 3 inside. The wall member 4 bears the horizontal component of the earth pressure, and transmits the force to the support pile 2 through the connecting member 3 as a shaped steel disposed inside. The wall member 4 is, for example, reinforced concrete in which steel bars 7 are arranged inside the concrete. The reinforcing bar 7 has a plurality of horizontal reinforcing bars 7a as, for example, main reinforcing bars, and a plurality of longitudinal reinforcing bars 7b as, for example, distributed reinforcing bars. The horizontal steel bar 7a has a diameter of D16, for example, and is arranged on the connection member 3 in the horizontal direction. The horizontal steel bar 7a is bound to the connecting structure 3 and fixed to the connecting structure 3 . The diameter of the longitudinal steel bar 7b is D13, for example. The vertical reinforcement 7b is bound to the horizontal reinforcement 7a, and is fixed to the horizontal reinforcement 7a.

Each horizontal steel bar 7a is placed on the connection structure 3, respectively. Therefore, the distance between the transverse steel bars 7 a in the vertical direction in the wall member 4 is equal to the distance between the connecting members 3 , for example, about 200 mm to 300 mm. The distance between the vertical steel bars 7b in the horizontal direction in the wall member 4 is, for example, about 200 mm to 300 mm. The reinforcement bars 7 are arranged in a lattice form inside the wall member 4 by the horizontal reinforcement bars 7a and the vertical reinforcement bars 7b.

The wall member 4 is installed at a position (underground) lower than the ground surface on the lower side of the step portion and penetrates into the ground. At the lower end of the wall member 4, there may also be formed a base beam 8 which bears the ground reaction force along the lower end. By installing the wall member 4 or the base beam 8 on the ground, it is possible to prevent possible heaving depending on the nature of the ground. By adjusting the depth of entry into the ground, the following phenomenon (arc sliding) can be prevented: the soil on the upper side of the step part of the land (back soil) will sink under the retaining wall 1 due to compaction and sinking, and the lower part of the step part will On the side, dig the bottom and push up the foundation.

Hereinafter, the fixation of the support pile 2 and the connection member 3 is demonstrated.

To the flanges of the H-shaped steel 6 of the support pile 2, the fixed end side flanges of the connection member 3 are fixed so as to be in surface contact with each other. For example, as shown in FIGS. 4 to 6 , the support pile 2 and the connection member 3 are fixed to each other by joining using arc welding. Members can be joined at the construction site by welding using a commonly used generator and welding machine (welding machine), and the joining work of the connecting member 3 to the support pile 2 can be performed quickly and easily on site. In addition, it is easy to adjust the height position of the connecting member 3 according to the welding work on site.

In addition, as shown in FIGS. 7 to 9 , the support pile 2 and the connection member 3 can also be fixed to each other by joining high-strength bolts 9 . The high-strength bolt 9 is, for example, a large hexagonal high-strength bolt (S10T M22), and the tightening torque can be confirmed according to the breakage of the pin tail (pin tail) formed in advance, which can ensure equal installation strength for a plurality of high-strength bolts 9 . The fastening of the high-strength bolt 9 is carried out using a torsional shear wrench (such as an ultra-short type). In the case of joining by high-strength bolts 9, only the generator can be used for the work.

Preferably, the shape or size of the connecting member 3 is adjusted or selected in such a way that the torsional shear wrench does not interfere with the connecting member 3 . For example, in the examples shown in FIGS. 7 to 9, as shown in FIG. 8, the plane view shape of the connecting member 3 is set as a trapezoid, so that the flange on the base end side fixed to the supporting pile 2 is convex on the top side of the protruding side. The edge is wider. The width of the proximal flange is, for example, 160 mm, and the width of the distal flange is, for example, 50 mm. In addition, as shown in FIG. 10 , the flange of the shaped steel is inclined on the inner side, so it is necessary to fasten the high-strength bolt 9 to the portion formed in a flat surface by using an inclined washer 10 for the shaped steel. The diameter of the through hole 11 formed in the support pile 2 can also be set as a loose hole larger than the diameter of the bolt within the allowable range of endurance. Thereby, the installation position of the connecting structure 3 in the height direction can be finely adjusted on site.

Next, the construction method of the retaining wall 1 of this embodiment is demonstrated.

First, drive the support pile 2 on site. The support pile 2 is driven in by the pre-drilling-cement slurry injection fastening method. At this time, by using a construction machine for driving (for example, manufactured by Avolon System Co., Ltd.) that can perform excavation, grout injection, and driving with one unit, driving can be completed with high precision in a short period of time. Due to low vibration, low noise and high maneuverability, this construction method is also suitable for construction in urban areas.

If the driving operation of the support pile 2 is described in more detail, it will be as follows, for example. The construction machinery for driving is equipped with a plurality of (for example, three) driving hooks and winders. The drilling machine (drill bit) used for digging and digging of construction machinery for driving moves up and down along the guide frame (leader) that acts as a guide rail. On site, first assemble the guide frame. The length of the guide frame is longer than the length of the support pile 2. Since the parts of the guide frame are pin joints, it can only be completed by the operator of the construction machine. Then, a drilling machine for cutting holes is installed. Then, a hose is connected between the mixing equipment of the cement slurry and the rafter installed on the upper part of the drilling machine.

In addition, the pile core is determined by marking a steel material called a gauge as the target installation position of the H-shaped steel 6, and the drilling machine is installed based on the marking. Then, the hole is drilled to a specified depth by the drilling machine, while the drilling machine is pulled out at the same speed as when drilling the hole and the soil is moved out, while the cement slurry is injected. In this way, the pressure of the cement slurry is used to prevent the wall of the cut hole from collapsing.

Then, in the state that the drilling machine and the guide frame are suspended from the construction machine, place the first H-shaped steel frame of the support pile 2 in one of the three hooks in the axial direction, and then lift it up. , move to the upper part of the digging hole and drive into the digging hole. In the first H-shaped steel 6, there is a gusset plate for joining with the second H-shaped steel 6 by high-strength bolts in advance. Furthermore, it is preferable to form through-holes for high-strength bolts in the H-shaped steel 6 before carrying it to the site.

When driving the H-shaped steel 6, the fine adjustment of the driving position is carried out by optical and laser position detectors and levels. When the top of the H-shaped steel 6 is about 1m away from the ground (GL), stop driving the first H-shaped steel 6 and unload it from the hook. Then, place the second H-shaped steel frame 6 in the axial direction behind the hoisting hook, and then hang Get up and move to the top of the first H-shaped steel 6. The second H-shaped steel 6 is inserted into the gusset plate installed on the first H-shaped steel 6, and then fastened with high-strength bolts. If the two H-shaped steels 6 connected are driven into predetermined depth as a support pile 2, then the driving of a support pile 2 is completed. Carry out the same operation on other supporting piles 2 in sequence.

After the supporting piles 2 are driven in, if it is necessary to dig the front of the supporting piles 2 in a place such as a sloping ground, it is only necessary to bury the horizontal guard plate in the ground between the supporting piles 2 before digging and pile them up in the height direction. The construction method of the temporary retaining wall may similarly excavate the front side of the support pile 2. In addition, the cross guard can also be used as a formwork when forming the wall member 4 . The horizontal guard plate does not need to be removed after concrete pouring, and can be kept as a part of the wall member 4 and kept buried by the soil on the rear side of the retaining wall 1 .

After the drive-in of multiple support piles 2 is completed, the support piles 2 are fixed as connecting structural members 3 of shaped steel. Firstly, the fixed position of the connecting member 3 is determined by setting out the wire on the flange of the support pile 2 . The connection member 3 is fixed by welding or high-strength bolts. After the fixing position of the connecting structure 3 is determined on site, the fixing of the connecting structure 3 by welding or high-strength bolts is carried out.

The situation of fixing the connection structure 3 on site is different from the situation of fixing the connection structure 3 to the H-shaped steel 6 in the factory in advance, and has the following advantages. That is, since the connecting member 3 is fixed on site, there is an advantage that the installation position of the connecting member 3 is not affected by the driving accuracy of the support pile 2 . In addition, the H-shaped steel 6 is transported, transported, stored, and driven in a state where the connecting structural member 3 is not fixed. Therefore, there is an advantage that the H-shaped steel 6 can be operated without being hindered by the connecting structural member 3, or the H-shaped steel can be hoisted and driven. 6 o'clock is easy to achieve balance and easy to maintain the advantages of H-shaped steel 6 plumb.

After all the connecting members 3 are fixed to the supporting piles 2, the reinforcement arrangement work for forming the wall member 4 is performed. The horizontal steel bar 7a only needs to be placed on the connecting structure 3 as the shaped steel, so the operation is easy. easy. The reinforcement bar 7 of the wall member 4 is arrange|positioned by binding the horizontal reinforcement 7a and the connection structure 3, or binding the vertical reinforcement 7b with respect to the horizontal reinforcement 7a.

Next, the concrete part of the wall member 4 is formed. The wall elements 4 are formed from cast-in-place concrete. In other words, the formwork is driven in, the concrete is poured, and the formwork is removed after ensuring the predetermined concrete strength. Thereby, the structural body of the retaining wall 1 in which the wall member 4 and the supporting pile 2 are integrated is completed.

As mentioned above, according to this embodiment, the wall member 4 made of reinforced concrete receives the horizontal component of the earth pressure, and transmits force to the support pile 2 through the connecting member 3 which is a shaped steel arranged inside. The retaining wall 1 is a synthetic structure in which the support pile 2 as the H-shaped steel and the wall member 4 as the reinforced concrete are integrated. Therefore, the retaining wall 1 can be structurally calculated using the usual method for supporting piles of H-shaped steel, steel, and reinforced concrete walls, without special analysis, and can also be calculated in the manner prescribed by building regulations. Therefore, in this embodiment, it is easy to check the strength.

On the other hand, conventional retaining walls made of concrete wall panels are point-supported by metal members such as tension bolts. Therefore, in order to confirm the strength of the structure, structural analysis using the finite element method is required. and other special analysis. In this embodiment, compared with a retaining wall made of siding made of concrete, it is possible to reduce the labor and time required for structural design, and it is possible to present the retaining wall 1 to a third party by an easily understandable method. strength.

According to this embodiment, unlike a masonry retaining wall, it is not necessary to make a slope to the vertical wall, and unlike a cantilever retaining wall, no bottom plate projecting forward or rearward of the vertical surface of the vertical wall is buried in the ground. Therefore, flat land will not be reduced, and since there is no area that interferes with the foundation of the building, the land for building the building can be secured to the maximum extent.

In this embodiment, the connecting member 3 as a shaped steel is installed on the front side of the support pile 2, and is housed inside the wall member 4 on the front side of the support pile 2, so that the support pile 2 and the wall member 4 are integrated. In the conventional retaining wall made of concrete wall panels, anchors or tension bolts are connected to the rear side of the wall panels and support piles, so it is necessary to dig the back side of the support piles to ensure construction space (temporary scaffolding) setup space or workspace, etc.). In contrast, in this embodiment, the connecting member 3 and the wall member 4 can be installed on the front side of the support pile 2, and the work on the back side of the support pile 2 is unnecessary. There is no need to secure more than the space for installing the supporting pile 2 .

Therefore, assuming that a retaining wall is built on a sloping land that is 5m higher than the inner side of the retaining wall and the land in front is lower, and the earthwork for leveling the land is carried out in front, in any case of the conventional construction method, the retaining soil All walls need to be constructed at a distance of more than 3m from the boundary line of the adjacent land with the inner land. On the other hand, in this embodiment, the retaining wall 1 can be installed if there is a space for installing the support pile 2 from the boundary line of the adjacent land (for example, 500 mm to 600 mm as the excavation diameter of the support pile 2 ).

In addition, since the concrete wall panels cannot be constructed after the connection, in order to install the wall panels on the support piles, it is necessary to drive the support piles on site with high precision in both the vertical and horizontal directions. On the other hand, in this embodiment, the fixing position of the connecting member 3 can be determined on site, and the wall member 4 can be formed by pouring concrete on site. Set up wall component 4. Furthermore, since the shape of the concrete wall panel is fixed to some extent, it may not be able to cope with it depending on the design conditions such as the land conditions at the construction site. On the other hand, in this embodiment, since the wall member 4 is reinforced concrete formed on site, it is possible to design and construct the retaining wall 1 flexibly corresponding to design conditions.

Furthermore, in the present embodiment, the support pile 2 and the wall member 4 are integrated through the connecting member 3 inside the reinforced concrete, so it is different from the case where metal members such as anchors or tension bolts in the joint portion of the wall panels contact the soil. There is no risk of reduced durability due to corrosion. Moreover, in this embodiment, Since the wall member 4 can be formed by pouring concrete on site, the construction period at the construction site is not affected by the delivery date from the factory, and the cost can be significantly suppressed, unlike wall panels made of concrete.

In addition, in this embodiment, shaped steel, reinforced concrete, etc., which are generally used as building materials, are used, and generally performed techniques can be applied to the operations performed in each step, and techniques requiring high precision are not required. Therefore, the retaining wall 1 of this embodiment can be installed in the construction site under various conditions.

2: Support pile

3: Connecting components

4: Wall components

6: H-shaped steel

7: steel bar

7a: Horizontal reinforcement

7b: Longitudinal reinforcement

Claims (6)

A retaining wall comprising: a plurality of support piles, each having a columnar portion formed by cement slurry in a foundation, and an H-shaped steel whose lower portion is disposed inside the columnar portion and whose upper portion is exposed from the columnar portion The connecting member is a shaped steel having a beam web, a first flange formed on one end side of the beam web, and a second flange formed on the other end side of the beam web, and the beam web is arranged substantially horizontally , the aforementioned first flange is fixed to the aforementioned H-shaped steel of the aforementioned supporting pile; and the wall member is formed of reinforced concrete, arranged along the aforementioned H-shaped steel of the plurality of aforementioned supporting piles, and fixed via the aforementioned connecting member buried inside In the aforementioned support piles, the horizontal component of the earth pressure is supported. The retaining wall as described in claim 1, wherein the steel bars of the reinforced concrete forming the wall member are fixed to the connecting member. The retaining wall as described in Claim 1, wherein the above-mentioned shaped steel of the above-mentioned connecting structural member is a channel-shaped steel, I-shaped steel or H-shaped steel manufactured by hot rolling. The retaining wall as described in Claim 2, wherein the aforementioned shaped steel of the aforementioned connecting structural member is channel-shaped steel, I-shaped steel or H-shaped steel manufactured by hot rolling. The retaining wall according to any one of claims 1 to 4, wherein the H-shaped steel of the supporting pile and the connecting member are fixed to each other by welding or high-strength bolts. A method for constructing a retaining wall, comprising the following steps: setting a plurality of support piles, the plurality of support piles respectively having a columnar part formed by cement slurry in the foundation, and a column with a lower part disposed on the columnar part H-shaped steel inside and its upper part exposed from the aforementioned columnar part; Fixing the first flange of the connecting structural member having a web, a first flange, and a second flange to the H-shaped steel of the supporting pile so that the web of the connecting structural member is substantially horizontally arranged , wherein the aforementioned first flange is formed on one end side of the aforementioned beam web, the aforementioned second flange is formed on the other end side of the aforementioned beam web; and the wall member is arranged along the aforementioned H-shaped steel of the plurality of aforementioned support piles , so that the aforementioned connecting member buried inside is fixed to the aforementioned support pile, and the aforementioned wall member bears the horizontal component of the earth pressure and is formed of reinforced concrete.

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