JP2003041580A - Pile for ground improvement and foundation structure for houses using it - Google Patents

Abstract

(57) [Summary] [Problem] To reduce or prevent the occurrence of pollution at the time of construction, and to surely suppress or prevent the settlement of the house after the construction, and to contribute to the improvement of the global environment. To obtain a ground improvement pile body and a residential foundation structure using the same. SOLUTION: A housing foundation 18 has a ground reinforcing portion 20 formed by embedding a plurality of ground improvement piles 10.
And a direct base portion 22 integrated therewith. By providing the ground reinforcing portion 20, the soft ground is compressed and improved, and the supporting strength is increased, so that the effect of suppressing and preventing settlement of the house can be obtained. In addition, the ground improvement pile 10 is made of a resin material using waste plastic, and contributes to improvement of the global environment. Further, since the ground improvement pile body 10 can be constructed by a heavy construction machine such as a small backhoe, pollution such as noise and vibration does not occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement pile and a residential foundation structure using the pile.

[0002]

2. Description of the Related Art Generally, when the ground on which a house is to be built is soft ground, ground improvement is carried out before the house is built. As a ground improvement for this type of house, a surface ground improvement method and a columnar ground method are widely used.

The former surface ground improvement method is used when the soft ground layer is relatively thin. The procedure is as follows. First, the soft ground surface layer is excavated and loosened, and then the cement-based solidifying material is used. The powder is sprinkled on the loosening soil, and then the loosening soil and the solidifying material are stirred and mixed, and finally, compacted by rolling.

On the other hand, the latter columnar ground improvement method is often used when the soft ground layer is thicker than that of the former, and the procedure is as follows. First, an auger is used to firmly support the soft ground layer. Perforation is made vertically to the ground, and then a cement-based improver is injected into the hole and solidified. In this case, the pile heads are not connected with concrete, but the foundation is directly placed. Therefore, it is different from the pile foundation.

[0005]

However, in the case of the above-mentioned conventional ground improvement method, there is a possibility that pollution such as noise and vibration may occur during construction due to the fact that a large construction heavy machine must be used. Moreover, it is difficult to reliably achieve the final goal of suppressing or preventing the settlement of the house after construction, which is the final goal, due to variations in the ground improvement effect. Therefore, the conventional ground improvement method has room for improvement in these points.

Specifically, in the former case of the surface ground improvement method, it is difficult to visually judge whether the stirring is good or bad. Therefore, when the loosened ground and the solidifying material are stirred, poor stirring occurs. there is a possibility. In this case, homogeneous ground improvement results cannot be obtained. Further, since it is difficult to visually determine the quality of the compaction, there is a possibility that the compaction is insufficient. In this case, cracks may occur on the improved ground surface. As described above, according to the surface ground improvement method, the ground improvement effect is likely to vary, and there is concern about achieving the final goal of suppressing or preventing the settlement of the house after construction. In addition, in the case of the surface ground improvement method, a relatively large construction heavy machine is required because even a general house has a considerable amount of agitation. Therefore, there is a possibility that some noise will be generated during the construction, which may disturb local residents.

On the other hand, in the case of the latter columnar improvement method, for example, if the soil of the local soil is humus soil, etc., the cement-based improving material impregnates the humus soil, etc.
Difficult to form. Therefore, the applicable soil is restricted by this columnar improvement method, and if it is applied to an unsuitable soil, a good pile cannot be formed and a sufficient soil improvement effect cannot be obtained. As described above, even in the columnar improvement method, there remains concern about achieving the final goal of suppressing or preventing the settlement of the house after construction. In addition, in the case of the columnar ground improvement method, the diameter is 400 mm using an auger
A hole of about 600 mm is drilled, but a large and dedicated construction heavy machine is required for that purpose, and there is a possibility that noise and vibration during construction will bother neighboring residents.

[0008] Apart from the above, considering the current situation,
In considering measures that can solve these problems, it is desirable to give due consideration to the global environment.

In view of the above background, the present invention can reduce or prevent the occurrence of pollution at the time of construction, and can reliably suppress or prevent the subsidence of a house after construction, and further improve the global environment. The purpose is to obtain a soil improvement pile body that can contribute and a residential foundation structure using the pile body.

[0010]

A ground improvement pile body according to the present invention as set forth in claim 1 is for ground improvement to be embedded in the soft ground for improving the ground when a house is constructed on the soft ground. The pile body is made of a resin material using waste plastic, and a spiral male screw portion is integrally formed on the outer peripheral surface.

According to a second aspect of the present invention, in the ground improvement pile body according to the first aspect of the present invention, the ground improvement pile body is hollow inside, and the upper end portion is a construction heavy machine. It is characterized in that a plurality of recesses used for coupling are integrally formed in the circumferential direction.

According to a third aspect of the present invention, there is provided a foundation structure for a house, comprising a ground reinforcement portion provided by arranging the ground improvement pile bodies according to the first or second aspect at a predetermined pitch, and It is configured by including a direct foundation portion provided by placing concrete in a predetermined range including the ground reinforcement portion, and the pile head portion of the plurality of ground improvement pile bodies forming the ground reinforcement portion is , Is directly integrated with the floor slab of the foundation part.

According to a fourth aspect of the present invention, there is provided a residential foundation structure according to the third aspect, wherein a heat insulating material having a predetermined thickness is horizontally arranged on a lower surface side of the floor slab of the direct foundation portion. In addition, a mesh material is embedded in the floor slab parallel to and above the heat insulating material, and the mesh material is placed on the upper surface of the pile head of the ground improvement pile body. By doing so, the positioning with respect to the heat insulating material is performed.

According to the first aspect of the present invention, since the ground improvement pile is made of a resin material, and a spiral male screw portion is integrally formed on the outer peripheral surface thereof, the ground improvement pile is used. Stand the pile vertically at a predetermined position on the soft ground,
By rotating around the axis while pressing in the axial direction, the ground improvement pile can be easily screwed (embedded) into the soft ground. Therefore, it is not necessary to perform a punching operation using an auger as in the conventional case, and a construction heavy machine such as a small backhoe can be sufficiently used. Therefore,
It is possible to reduce or prevent pollution caused by noise and vibration during construction.

Further, according to the present invention, by embedding the soil improvement piles in the soft soil at appropriate intervals, the soft soil can be compressed and compacted in the radial direction of the soil improvement pile. Therefore, it is possible to suppress or prevent consolidation settlement of the house after construction. Further, since the spiral male screw portion is formed on the outer peripheral surface of the ground improvement pile body, the peripheral frictional force of the ground improvement pile body can be increased. Therefore,
Housing support strength can be increased. Therefore, also from this viewpoint, it is possible to suppress or prevent the subsidence of the house after construction.

Further, according to the present invention, since the ground improvement pile is made of the resin material using the waste plastic, the waste plastic can be recycled and it can contribute to the improvement of the global environment. As the waste plastic, it is possible to use resin-made waste materials that are generated during the factory production of components, or to use resin-made waste materials that are generated in completely different business fields (for example, the automobile industry). Is also possible.

According to the second aspect of the present invention, the ground improvement pile body is hollow inside, and a plurality of concave portions are integrally formed in the upper end portion in the circumferential direction. Can be used to connect to construction heavy equipment. For example,
Assuming that the recesses are formed at intervals of 90 degrees, by mounting an attachment or the like on the tip of the small backhoe, the work of embedding the pile can be performed by screwing a Phillips screw with a screwdriver.

In the present invention, since the ground improvement pile is made of the resin material using the waste plastic as described above, it is possible to integrally form the concave portion (with the male screw portion) at the time of resin molding. it can. Therefore, it is possible to reduce the number of parts and the number of assembling steps as compared with the case where the part corresponding to the recessed part or the part corresponding to the male screw part is formed by a part different from the pile, and the ground improvement is provided with these elements. A pile for use can be easily manufactured.

Further, according to the present invention, since the ground improvement pile body is hollow inside, the weight of the ground improvement pile body can be reduced. The hollow portion may be filled with a cement-based solidifying material or sand, and any filling material that does not interfere can be applied.

According to the present invention of claim 3, claim 1
Alternatively, by arranging the ground improvement pile bodies according to the second aspect at a predetermined pitch, the above-described action is obtained, and the ground is improved and reinforced. On the other hand, the foundation is directly provided by placing concrete in a predetermined range including the reinforced ground reinforcing portion. Then, in the present invention, since the pile heads of the plurality of ground improvement piles constituting the ground reinforcement portion are directly integrated with the floor slab of the foundation portion, the reinforcing effect of the ground reinforcement portion directly extends to the foundation portion. , It is possible to effectively suppress or prevent the subsidence of a house built directly on the foundation.

According to the fourth aspect of the present invention, a mesh material arranged parallel to the heat insulating material and embedded in the floor slab is mounted on the upper surfaces of the pile heads of the plurality of ground improvement pile bodies. Placed. This makes it possible to position the mesh material with respect to the heat insulating material and to secure the covering, so that the spacer block conventionally placed on the heat insulating material can be eliminated.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a ground improvement pile body and a residential foundation structure using the same according to the present invention will be described below with reference to FIGS.

FIG. 1 shows a plan view, a front view, and a longitudinal sectional view of a ground improvement pile body 10 according to this embodiment. As shown in this figure, the ground improvement pile body 10 is formed in a straight rod shape whose tip portion is a conical surface 10A,
It is also made of a resin material that uses waste plastic. Incidentally, as the waste plastic, resin waste materials generated at the time of factory production of the members may be used,
It is also possible to use resin waste materials generated in completely different business fields (for example, the automobile industry). Further, the pile length of the ground improvement pile body 10 of the present embodiment is 1000 mm as an example, and the radial dimension is 150 mm. Therefore, the pile is a very short pile as compared with precast piles such as steel pipe piles and so-called cast-in-place concrete piles used in so-called pile foundations, and is a pile for reinforcing the soft ground 24 to be described later for the purpose of ground improvement. , The direct foundation part 22 described later
It is a pile for constructing the ground reinforcement portion 20 for supplementing the supporting strength of the above, and is clearly distinguished from a so-called pile foundation.

The inside of the above-mentioned ground improvement pile body 10 is hollow so that concrete can be filled at the time of directly placing the foundation portion 22 which will be described later. Note that sand or the like other than concrete may be used as the filler.
Further, a concave portion 12 is formed at the center of the bottom portion 10B of the ground improvement pile body 10 for inserting and positioning a lower end portion of a pile core reinforcing bar 28 described later. Further, a spiral male screw portion (rotational penetration rib) 14 is integrally formed on the outer peripheral surface of the ground improvement pile body 10. Further, the upper end of the ground improvement pile body 10 is open, and the concave portions 16 having a rectangular shape in a side view are integrally formed on the upper peripheral wall portion at 90-degree intervals.

2 to 4 show a residential foundation 18 using the ground improvement pile body 10 described above. As shown in these drawings, the residential foundation 18 is provided with the ground reinforcement portion 2
0 and a direct foundation portion (solid foundation portion) 22.

As shown in FIG. 4, the ground reinforcement portion 20.
Is configured by embedding the above-mentioned ground improvement pile body 10 at a predetermined pitch (500 mm as an example). The conical surface 10A of the ground improvement pile 10 is located inside the soft ground 24, and does not reach the solid ground below the soft ground 24. Therefore, the ground improvement pile body 10 belongs to a friction pile that obtains a supporting force by the peripheral frictional force of the pile, according to the classification by the support mechanism of the pile. In the state where the ground improvement pile body 10 is embedded in the soft ground 24, the pile head 10C of each ground improvement pile body 10 has the ground surface 2
6 is projected upward by a predetermined length. Also,
At the axial center portion of the pile head portion 10C, a pile core reinforcing bar 28 for joining with the direct foundation portion 22 described below is provided upright.
The pile core reinforcing bar 28 has a length approximately the same as the axial length of the ground improvement pile body 10, and in the state where the lower end portion is fitted into the above-mentioned concave portion 12 and is erected, the upper end portion is erected. Is the foundation part 2 directly
It is arranged to be close to the second main muscle 30.

On the other hand, the direct foundation portion 22 is constructed by pouring concrete in a predetermined area including the ground reinforcing portion 20. In the present embodiment, as an example, a basic area having a vertical dimension of 9000 mm and a horizontal dimension of 7500 mm is assumed.

More specifically, the basic structure of the direct foundation part 22 will be described in more detail. A crushed stone 32 is laid on the ground surface 26 when excavated to a predetermined depth, and further, a discarded concrete (leveling concrete) 34 is placed thereon. It is cast and the earthwork is done. After finishing the earthwork, basic bar arrangement was performed,
Concrete is poured. At this time, a heat insulating material 38 having a predetermined thickness is laid in advance on the lower surface side of the floor slab 36, and the wire mesh 40 is arranged in the floor slab 36 in parallel with the heat insulating material 38 in upper and lower two stages. , 42 are arranged in advance so as to be buried. The wire mesh 40 on the upper side is placed by using the main bars 30 embedded in the floor slab 36, and the wire mesh 42 on the lower side as a "mesh material" is used for the ground improvement pile body 10. It is placed using the upper end surface of the pile head portion 10C.

The pile head portion 10 of the above-mentioned ground improvement pile body 10
C is directly embedded in the floor slab 36 of the foundation 22 together with the pile core reinforcing bar 28, whereby the ground reinforcing portion 20 is directly integrated with the foundation 22. At this time, the pile head portion 10C of the ground improvement pile body 10 is adjusted so that the distance between the heat insulating material 38 and the lower wire mesh 42 becomes a predetermined distance.
Are protrudingly arranged in the floor slab 36.

Next, the operation and effect of this embodiment will be described.

First, the procedure for constructing the ground reinforcing portion 20 will be described. The construction procedure of the ground reinforcement portion 20 is also understood as a ground improvement method for the soft ground 24.

First, as shown in FIGS. 5 and 6,
Arm 46 of small backhoe 44 as "construction heavy equipment"
The drive mechanism 48 is attached to the tip of the. Drive mechanism section 4
8 is a mounting portion (mounting bracket) 50 to the arm tip
And a motor portion 52 fixed to the mounting portion 50, and an attachment 56 fixed to an output shaft 54 of the motor portion 52. Furthermore, the attachment 56 is a rod-shaped rod 56A inserted into the pile head portion 10C of the ground improvement pile body 10, a disc-shaped base portion 56B provided at the base end portion of the rod 56A, and a lower surface of the base portion 56B. And a cross-shaped engaging portion 56C integrally formed with the. The cross-shaped engaging portions 56C are provided at four recesses 16 formed in the pile head portion 10C of the ground improvement pile body 10.
Are dimensioned to fit in.

When the drive mechanism 48 is mounted on the tip of the arm 46 of the small backhoe 44, the engaging portion 56C of the attachment 56 is fitted into the recess 16 of the pile head 10C of the ground improvement pile body 10, and the motor portion. 52 is driven and rotated at a predetermined rotation speed. As a result, the ground improvement pile body 10 is vertically embedded in the soft ground 24 so that the screw is screwed by the male screw portion 14. This work is performed for all the dots set in advance.

As described above, a predetermined number of ground improvement piles 1
In the state where 0 is embedded, adjacent ground improvement piles 10
The soft ground 24 located between them is compressed in the radial direction of the ground improvement pile body 10 and compacted. Therefore, the soil particle density increases and the ground strength increases. As a result, the soft ground 24
Is reinforced.

Next, the foundation 22 is directly constructed and integrated with the ground reinforcement 20. First, the ground work was done, and the main line 3
0 etc. are reinforced and the heat insulating material 38 and wire mesh 4
0 and 42 are arranged. At this time, ground improvement pile 10
The pile core reinforcing bar 28 is also inserted therein. After that, concrete is poured. At this time, concrete is also filled in the ground improvement pile body 10. In the state where the foundation 22 is directly constructed in this manner, the pile head 10C of the ground improvement pile 10 is directly embedded in the floor slab 36 of the foundation 22 to be integrated. Therefore, the reinforcing effect of the ground reinforcement portion 20 directly extends to the foundation portion 22, and the support strength of the foundation portion 22 is increased.

As described above, the residential foundation 1 according to the present embodiment
In 8, the plurality of ground improvement piles 10 forming the ground reinforcement 20 are made of a resin material, and the spiral male screw portion 14 is integrally formed on the outer peripheral surface thereof. If the pile body 10 is erected vertically at a predetermined position on the soft ground 24 and is rotated around the axis line while being pressed in the axial direction, the ground improvement pile body 10 can be easily moved to the soft ground 24.
It can be screwed (embedded) inside. Therefore, there is no need for drilling work using an auger as in the past.
For example, even a construction heavy machine such as a small backhoe 44 can sufficiently cope with the problem. Therefore, it is possible to reduce or prevent the occurrence of pollution due to noise or vibration during construction.

Further, in relation to the above, in the ground improvement pile body 10 according to the present embodiment, a plurality of recesses 16 are integrally formed in the upper end portion in the circumferential direction, and the recesses 16 are utilized to make the small backhoe 44. Since it is configured to be connected to the drive mechanism portion 48 attached to the tip end portion of the arm 46, the ground improvement pile body 1
0 and the construction heavy equipment can be easily connected.

Further, the residential foundation 18 according to the present embodiment.
Then, by embedding the soil improvement pile body 10 in the soft soil 24 at an appropriate interval, the soft soil 24 can be compressed in the radial direction of the soil improvement pile body 10 and compacted, so that the soft soil 24 is effectively Can be reinforced. Further, since the spiral male screw portion 14 is formed on the outer peripheral surface of the ground improvement pile body 10, the peripheral frictional force of the ground improvement pile body 10 can be increased. Then, by integrating the above-mentioned ground reinforcing portion 20 and the direct foundation portion 22, the reinforcing effect of the ground reinforcing portion 20 directly extends to the foundation portion 22 and the supporting strength of the ground reinforcing portion 20 directly supports the foundation portion 22. This is added to the strength, and as a result, according to the present embodiment, it is possible to effectively suppress or prevent the settlement of the house built directly on the foundation portion 22.

Further, in the residential foundation 18 according to this embodiment, since the ground improvement pile body 10 constituting the ground reinforcement portion 20 is made of the resin material using the waste plastic, the waste plastic can be recycled. And can contribute to the improvement of the global environment.

Generally speaking, according to the housing foundation 18 of the present embodiment, it is possible to reduce or prevent the occurrence of pollution at the time of construction, and to reliably suppress or prevent the subsidence of the housing after construction. It is possible to contribute to the quality improvement of the global environment.

Further, the ground improvement pile body 1 according to this embodiment.
In No. 0, since it is made of a resin material using waste plastic, the concave portion 16 (together with the male screw portion 14) can be integrally formed at the time of resin molding. Therefore, the recess 16
The number of parts and the number of assembling steps can be reduced, and the ground improvement pile including these elements can be reduced as compared with the case where the portion corresponding to the above and the portion corresponding to the male screw portion 14 are configured by separate parts from the pile. The body 10 can be easily manufactured. In addition, since the soil improvement pile body 10 according to the present invention is hollow inside, it is possible to reduce the weight of the soil improvement pile body 10. Therefore, the soil improvement pile body 1 according to the present embodiment
If 0 is used, the cost can be reduced, the manufacturing can be facilitated, and the weight can be reduced.

Further, the residential foundation 18 according to the present embodiment.
Then, by placing the lower wire mesh 42 on the upper surface of the pile head 10C of the plurality of ground improvement piles 10,
Since the lower mesh wire member 42 is positioned with respect to the heat insulating material 38, the spacer block conventionally placed on the heat insulating material 38 for the purpose of positioning and securing the fogging can be eliminated. As a result, according to this embodiment, cost reduction can be achieved.

In addition, according to the ground improvement pile body 10 and the residential foundation 18 using the same according to the present embodiment, the following effects can be obtained in relation to the prior art.

In the case of the surface ground improvement method, there is a possibility that the powder of the cement-based solidifying material may scatter when sprayed, which may cause trouble to the neighboring residents. However, according to the present embodiment, the solidifying material of the powder is used. No such problem will occur.

In both the surface ground improvement method and the columnar ground improvement method, it is difficult to apply the method to a small site due to the use of a large construction machine. However, according to this embodiment,
Since construction can be performed using a construction machine such as a small backhoe 44, it can be applied to such a small site.

Since the ground improvement pile body 10 according to the present embodiment is made of a resin material and has an internal hollow structure, it is extremely lightweight, and therefore is transported and temporarily stored by an operator on site. And the work effort when setting piles at the construction position is reduced.

Further, the soil improvement pile body 1 according to the present embodiment.
Since 0 is made of a resin material, there is no problem of corrosion. Therefore, it is also excellent in durability.

[0048]

As described above, the ground improvement pile body according to the present invention as set forth in claim 1 is made of a resin material using waste plastic, and a spiral male screw portion is integrally formed on the outer peripheral surface. Therefore, it is possible to reduce or prevent the occurrence of pollution during construction, and it is possible to surely suppress or prevent the subsidence of the house after construction, and further to contribute to the quality improvement of the global environment. Has excellent effect.

A ground improvement pile body according to a second aspect of the present invention is the same as the first aspect of the present invention, in which the ground improvement pile body is internally hollow, and the upper end portion is used for connection with a construction heavy machine. Since the plurality of concave portions are integrally formed in the circumferential direction, it has an excellent effect that the cost can be reduced, the manufacturing can be facilitated, and the weight can be reduced.

According to a third aspect of the present invention, there is provided a foundation structure for a house, comprising a ground reinforcement portion provided by arranging the ground improvement pile bodies according to the first or second aspect at a predetermined pitch, and It is configured by including a direct foundation part provided by placing concrete in a predetermined range including the ground reinforcement part, and directly connecting the pile heads of a plurality of ground improvement piles forming the ground reinforcement part. Since it is integrated with the floor slab of the foundation part, it has an excellent effect that the settlement of the house after construction can be surely suppressed or prevented.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the heat insulating material having a predetermined thickness is horizontally arranged on the lower surface side of the floor slab of the direct foundation portion. At the same time, a mesh material is embedded in the floor slab in parallel and upward with respect to the heat insulating material, and further, by placing the mesh material on the upper surface of the pile head of the ground improvement pile body, the heat insulating material Since the positioning and the securing of the fogging are performed, the spacer block which has been conventionally required can be eliminated, and as a result, there is an excellent effect that the cost can be reduced.

[Brief description of drawings]

1A is a plan view of a soil improvement pile body according to the present embodiment, FIG. 1B is a front view of the soil improvement pile body, and FIG. 1C is a longitudinal sectional structure of the soil improvement pile body. Showing (A) CC
It is a line sectional view.

FIG. 2 is a plan view of a residential foundation constructed by using the ground improvement pile body shown in FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2 showing a vertical sectional structure of the residential foundation shown in FIG.

FIG. 4 is an enlarged cross-sectional view of an essential part showing details of the vertical cross-sectional structure of the residential foundation shown in FIG.

FIG. 5 is a schematic configuration diagram schematically showing a connection structure between a pile head of a ground improvement pile and a construction heavy machine.

FIG. 6 is an explanatory view showing a construction situation when embedding a ground improvement pile body using a construction heavy machine.

[Explanation of symbols]

10 Ground improvement piles 10C pile head 14 Male thread 16 recess 18 Foundation for housing 20 Ground reinforcement 22 Direct Foundation 24 soft ground 36 floor slabs 38 Insulation 42 wire mesh (mesh material) 44 Small backhoe (construction heavy equipment)

Claims (4)

[Claims] 1. A ground improvement pile that is embedded in a soft ground when building a house on the soft ground, and is made of a resin material using waste plastic and has an outer periphery. A pile body for ground improvement characterized in that a spiral male screw portion is integrally formed on the surface. 2. The ground improvement pile body is hollow inside, and further, a plurality of recesses used for connection with construction heavy equipment are integrally formed in the upper end portion in the circumferential direction. The ground improvement pile body according to claim 1. 3. A ground reinforcement portion provided by arranging the ground improvement pile bodies according to claim 1 or 2 at a predetermined pitch, and concrete is placed in a predetermined range including the ground reinforcement portion. A direct foundation portion provided by the above is included, and the pile heads of the plurality of ground improvement piles constituting the soil reinforcement portion are integrated with the floor slab of the direct foundation portion. The basic structure for a house, which is characterized by 4. A heat insulating material having a predetermined thickness is horizontally arranged on the lower surface side of the floor slab of the direct foundation part, and a mesh material is parallel to and above the heat insulating material in the floor slab. It is buried, and the mesh material is positioned with respect to the heat insulating material by being placed on the top surface of the pile head of the ground improvement pile body. Basic structure for a house as described.