JP2007170076A - Tool for ground reinforcing work, and ground reinforcing structure and ground reinforcing method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing pile reinforcing tool which imparts sufficient resistance force against soil pressure. <P>SOLUTION: The reinforcing tool arranged in the lower part of a foundation of a structure to reinforce the ground comprises a plurality of guide members and a connecting member disposed between the guide members. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a ground reinforcement method and a jig used for the construction.

Conventionally, the following methods are used for the ground reinforcement method in the construction of structures such as small-scale houses.
(1) Stir and mix the cement-based solidified material and the surface ground soil, and roll it to build an improved body. Surface improvement method (2) Inject and stir the cement-based solidified material to a stable ground. Column improvement method to construct a columnar improvement body (3) Steel pipe pile method that drives steel pipe piles to a solid ground to obtain support

The above ground reinforcement method has the following problems.
(1) Depending on the components of the cement-based solidifying material, elution of hexavalent chromium from the improved body has been pointed out.
(2) When the cement-based solidified material is stirred and mixed, the solidified material may be scattered by wind or the like, which may adversely affect the surrounding environment.
(3) The strength of the improved body may become uneven due to uneven stirring.
(4) Removal of the improved body mixed in the soil may not be possible.
(5) Soil is generated by excavation.
(6) In the steel pipe pile construction method, since it is necessary to use a support pile having a length that reaches a solid ground, the construction cost becomes expensive. When the support pile is a short pile, it becomes unstable against earth pressure from the horizontal direction.

  An object of this invention is to provide the reinforcement jig | tool and the reinforcement construction method using the reinforcement jig | tool of a support pile which can fully provide the resistance with respect to earth pressure, and the jig | tool.

The first invention of the present application made to achieve the above object is a reinforcing jig embedded in the ground below the foundation of a structure to reinforce the ground, and includes a plurality of guide members and the guide members It is a reinforcement jig characterized by consisting of a connecting member arranged in.
According to a second invention of the present application, in the first invention described above, the guide member is arranged at a vertex of a substantially triangular shape in plan view, and the guide members are connected to each other by the connecting member. It is a tool.
According to a third invention of the present application, in the first invention described above, the guide member is arranged at a substantially rectangular apex in plan view, and the opposing apexes of the guide member are connected in a substantially cross shape by the connecting member. This is a reinforcing jig.
A fourth invention of the present application is the reinforcing jig according to any one of the first to third inventions, wherein the guide member is provided with a hole through which the support pile can be inserted.
5th invention of this application is the ground reinforcement structure which is provided in the lower part of the foundation of a structure, and reinforces the ground, Comprising: The reinforcement jig | tool as described in 4th invention of this application embed | buried in the ground, and the said reinforcement jig It is the ground reinforcement structure which consists of the support pile penetrated into the guide member hole part of this, and couple | bonded the said support pile and the said guide member.
A sixth invention of the present application is a ground reinforcement method for reinforcing a ground by placing a plurality of support piles, wherein the reinforcement jig according to the fourth invention of the present application is embedded, It is a ground reinforcement construction method characterized in that the guide member and the support pile are integrated by penetrating through the hole of the guide member.
A seventh invention of the present application is a ground reinforcement method for reinforcing a ground by placing a plurality of support piles, wherein a plurality of reinforcing jigs according to the fourth invention of the present application are embedded, and the plurality of reinforcing jigs In the ground reinforcement construction method, characterized in that the guide pile and the support pile are integrated by connecting the gap between the gaps by a connecting member, penetrating the support pile into the hole of the guide member of the reinforcement jig. is there.

The present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> Since the connecting member restrains the movement of the guide member in the horizontal direction, the support pile coupled to the guide member is also restrained from moving in the horizontal direction. Thereby, even if a support pile is a short pile, it is stable and can comprise a firm ground.
<2> Since the connecting member resists earth pressure, the horizontal resistance during an earthquake is greater than that of a single pile.
<3> Since a plurality of support piles are connected, the load received from the structure can be dispersed.
<4> Since the support pile is inserted by being pierced in a reinforcing jig that is buried and fixed in advance in the ground, positioning of the support pile is facilitated. In addition, it is possible to prevent the support pile from tilting and misalignment when the support pile is placed.
<5> Since no cement-based solidifying material is used, the environment is not adversely affected.
<6> The liquefaction suppression effect can be expected by connecting the reinforcing jigs with a connecting member and arranging the reinforcing jigs on the outer periphery of the structure.
<7> Deflection of the foundation can be prevented by arranging it in a state of being connected under the foundation rising portion. Moreover, arrangement | positioning of a support pile can be decreased by connecting.
<8> Since the ground reinforcement structure can be easily removed at the time of dismantling the structure, it is easy to reuse the land.
<9> No residual soil is generated due to excavation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(1) Outline of Reinforcing Jig The reinforcing jig 10 according to the present invention is constituted by a plurality of guide members 20 and a connecting member 30 disposed between the guide members 20 as shown in FIG.
Hereinafter, each component will be described in detail.

(2) Guide member The guide member 20 is a member that determines a placement position of the support pile 40 in advance, and has a hole portion 21 through which the support pile 40 can penetrate, and is configured to be embedded in the ground.
The planar cross-sectional shape of the guide member 20 may be circular or polygonal. Further, the side surface may be tapered so as to easily penetrate into the ground, or may have a weight shape.
The outer peripheral portion of the guide member 20 has a well-known connection mechanism such as welding or male-female fitting, and is configured to be connectable to an end portion in the longitudinal direction of the connection member 30.

(3) Connecting Member The connecting member 30 is a member that connects the guide member 20.
The connecting member 30 is made of a rectangular plate material, H steel, I-shaped steel, or round steel. In the case of a rectangular plate material, it is disposed between the guide members 20 so that the longitudinal surface 31 is substantially parallel to the vertical.
The end portion in the longitudinal direction of the connecting member 30 has a well-known connecting function such as welding and male-female fitting, and is configured to be connectable to the outer peripheral portion of the guide member 20.

As shown in FIG. 1, the reinforcing jig 10 has a guide member 20 arranged in an I shape in plan view, and the guide member 20 is connected by a connecting member 30. In addition, as shown in FIGS. 2 and 3, the guide member 20 is arranged so as to form a polygonal shape such as a substantially triangular shape or a substantially square shape in plan view, and the guide member 20 is connected by the connecting member 30. Thus, the reinforcing jig 10 is configured.
The plurality of reinforcing jigs 10 having different shapes are selectively used according to the shape of the foundation 60 described later, as shown in FIG.

  Next, the ground reinforcement structure and the ground reinforcement construction method using the reinforcing jig 10 will be described.

<1> Installation of Reinforcing Jig As shown in FIG. 5, the reinforcing jig 10 is installed on the ground 70 to be reinforced. The installation position is adjusted to the position where the support pile 40 is placed.
In order to fix the reinforcing jig 10, the reinforcing jig 10 is penetrated into the ground 70 to a preset depth.
When the supporting ground is in a shallow position and the guide member 20 reaches the supporting ground, the reinforcing jig 10 itself has a ground reinforcing structure, and the driving pile 40 need not be driven.

<2> Placing Support Pile The support pile 40 is penetrated into the hole 21 of the guide member 20 of the reinforcing jig 10 penetrating into the ground 70 and placed.
Since the placement position is determined by the reinforcing jig 10 in advance, the penetration positioning of the support pile 40 is easy. Moreover, since the support pile 40 penetrates into the guide member 20 and is driven, the support pile 40 can be prevented from being inclined or misaligned.
After the placement, as shown in FIG. 6, when the top of the support pile 40 is at a high stop due to reaching the support ground 71 and the upper portion of the support pile 40 protrudes upward from the guide member 20, the guide member 20 Cut off the protruding part.

<3> Connection of Support Pile and Reinforcement Jig The guide member 20 and the support pile 40 are combined and integrated to form a ground reinforcement structure. The joining method may be welding or fixing with bolts.
Since the connecting member 30 restrains the movement of the guide member 20 in the horizontal direction, and the connecting member 30 resists earth pressure and restrains the movement of the guide member 20, the support pile 40 coupled to the guide member 20. Is also restrained from moving. Thereby, even if it is a short pile with which the support pile 40 does not reach the strong support ground 71 and is easy to construct, a stable and strong ground can be configured.
Moreover, because it is reinforced with short piles, it is easy to remove when dismantling the structure, and the land can be reused easily.
After the support pile 40 is fixed, the reinforcing cap 50 is provided on the upper surface of the reinforcing jig 10.

<4> Installation of Foundation When the ground reinforcement of the predetermined arrangement is completed according to the shape of the structure, as shown in FIG. 7, the foundation 60 of the structure is installed on the upper part. A direct foundation such as a cloth foundation or a solid foundation can be applied to the foundation 60.
The load received from the foundation by the reinforcing cap 50 is dispersed throughout the reinforcing jig 10. At this time, since a plurality of guide members 20 and support piles 40 are connected, the load can be distributed to the plurality of guide members 20 and support piles 40.

As shown in FIG. 8, when the structure is constructed in the vicinity of the retaining wall 80, if there is a bottom plate of the retaining wall 80 at the lower part, reinforcement by the support pile 40 cannot be performed.
Even in that case, since the reinforcing jig 10 supports the end of the foundation 60, the bending load applied to the foundation 60 can be reduced.

<5> Other Embodiments If necessary for the structure of the structure, a plurality of reinforcing jigs 10 are connected by connecting members 32 as shown in FIG. For the connection, a known method such as welding or male-female fitting is used.
By connecting and supporting the lower part of the foundation 60, the deflection of the foundation 60 can be prevented.
Further, by connecting and reinforcing, the placement of the reinforcing jig 10 and the support pile 40 can be reduced.
Moreover, the liquefaction suppression effect can be anticipated by connecting between the reinforcement jig | tool 10 and arrange | positioning in the lower part of the outer peripheral part of a structure.

The perspective view of the reinforcement jig concerning this invention The perspective view of the reinforcement jig concerning this invention The perspective view of the reinforcement jig concerning this invention The top view which shows the Example of this invention Sectional drawing which shows the Example of this invention Sectional drawing which shows the Example of this invention Sectional view when placing the foundation Sectional drawing which shows the Example of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Reinforcement jig 20 ... Guide member 21 ... Hole 30 ... Connection member 31 ... Longitudinal surface 32 ... Connection member 40 ... Support pile 50 ... Reinforcement cap 60 ... Base 70 ... Ground 71 ... Support ground 80 ... Retaining wall

Claims (7)

A reinforcing jig that is buried in the ground below the foundation of the structure and reinforces the ground,
A plurality of guide members;
A connecting member disposed between the guide members,
Reinforcing jig.
The reinforcing jig according to claim 1, wherein the guide member is arranged at a substantially triangular apex in plan view, and the guide members are connected to each other by the connecting member.
The reinforcing jig according to claim 1, wherein the guide member is arranged at a substantially quadrangular apex in a plan view and the opposing apexes of the guide member are connected in a substantially cross shape by the connecting member. Reinforcing jig.
The reinforcing jig according to any one of claims 1 to 3, wherein the guide member is provided with a hole through which a support pile can penetrate.
A ground reinforcement structure that is provided at the bottom of the foundation of the structure and reinforces the ground,
Reinforcing jig according to claim 4, embedded in the ground,
It consists of a support pile that penetrates into the guide member hole of the reinforcing jig,
The support pile and the guide member are combined,
Ground reinforcement structure.
It is a ground reinforcement method to reinforce the ground by placing multiple support piles,
The reinforcing jig according to claim 4 is embedded,
Insert the support pile into the hole of the guide member of the reinforcement jig,
The guide member and the support pile are integrated,
Ground reinforcement method.
It is a ground reinforcement method to reinforced the ground by placing multiple support piles,
A plurality of reinforcing jigs according to claim 4 are embedded,
The plurality of reinforcing jigs are connected by a connecting member,
Insert the support pile into the hole of the guide member of the reinforcement jig,
The guide member and the support pile are integrated,
Ground reinforcement method.

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