JP2016160700A - Foundation reinforcement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation reinforcement method capable of reinforcing a foundation without drilling a periphery of an existing foundation structure and processing a foundation structure itself.SOLUTION: A foundation reinforcement method of reinforcing an existing foundation structure 1 includes an injection part formation step of forming a hardener injection part along an outer edge of the foundation structure 1 in the vertical direction and a reinforcement structure formation step of forming a reinforcement structure 4 so that at least a part thereof is arranged immediately below the foundation structure 1 by injecting a hardener from the hardener injection part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foundation reinforcing method, and more particularly to a foundation reinforcing method for reinforcing an existing foundation structure.

  When constructing structures such as buildings, multiple piles under the foundation structure such as the footing foundation are used as a means to prevent the sinking of the foundation and the building on the foundation by strengthening the foundation supporting the building etc. Reinforcing the body is provided.

  However, when a structure such as a building is further constructed on the foundation structure, there is a possibility that the existing pile body alone cannot withstand the load. In addition, in order to strengthen seismic reinforcement, it may be desired to strengthen the foundation by increasing piles, and various foundations are being reinforced.

FIG. 9 and FIG. 10 show an example of a conventional method for reinforcing the foundation. FIG. 9 is a side sectional view of a foundation reinforcing structure according to a conventional construction method, and FIG. 10 is a plan view of the foundation reinforcing structure in FIG.
As shown in FIGS. 9 and 10, in the conventional general construction method, the outer periphery of the existing foundation structure 1 in which the existing pile body 2 is disposed below is substantially the same height as the bottom surface of the foundation structure 1. The excavation part 501 is formed by excavation to a depth, and after placing a new pile body (additional pile 502) in the excavation part 501, the existing foundation structure 1 is expanded to a position covering the increase pile 502. An extension unit 503 is formed.

However, in urban areas or the like, there may be cases where a construction site for forming the excavation part 501 cannot be sufficiently secured around the existing foundation structure 1.
Therefore, for example, in Patent Document 1, a through-hole penetrating vertically is provided in an existing foundation structure, and a cylindrical ground improvement body is formed directly under the existing foundation structure by a high-pressure injection replacement method using the through-hole. It is proposed to build.
According to such a method, the ground can be reinforced even when there is an existing building around the existing foundation structure and the excavation part cannot be formed.

JP 2001-279667 A

  However, in the method described in Patent Document 1, when a building such as a store already exists on the existing foundation structure, it becomes an obstacle to the construction by providing a through hole in the foundation structure. In some cases, it may be necessary to discuss the leased land or relocation.

  The present invention has been made in view of the above circumstances, and a foundation reinforcement method capable of reinforcing a foundation without requiring excavation around the existing foundation structure or processing the foundation structure itself. Is intended to provide.

In order to solve the above-mentioned problem, the foundation reinforcing method which is the invention of the present application,
A foundation reinforcement method for reinforcing an existing foundation structure,
An injection part forming step of forming a solidifying material injection part in a vertical direction along the outer edge of the foundation structure;
Reinforcing structure forming step of forming a reinforcing structure so that at least a part thereof is disposed directly below the foundation structure by injecting the solidifying material from the solidifying material injection portion;
Is included.
By constructing in this way, there is no need to dig around the existing foundation structure to provide an excavation part, or to drill a through hole in the foundation structure itself. The foundation structure of can be reinforced.
Since the reinforcing structure can bear the force (axial force) applied in the vertical direction and support the existing foundation structure, rotational deformation and distortion in the axial direction of the foundation structure and the structure built thereon Etc. can be prevented.

Moreover, the said reinforcement structure formation process forms the said reinforcement structure in the column shape which made the center of the axis | shaft of the said solidification material injection | pouring part a circle center.
By comprising in this way, a reinforcement structure can be simply formed by the existing construction methods, such as a high pressure injection stirring method, a mechanical stirring construction method, and a high pressure injection combined type mechanical stirring construction method, for example.

Preferably, in the reinforcing structure forming step, the reinforcing structure is formed in a columnar shape having a cross-sectional fan shape with the axial center of the solidifying material injecting portion as a circle center.
By comprising in this way, the influence on the circumference | surroundings of a foundation structure becomes less. In particular, when the entire reinforced structure is arranged directly under the foundation structure, the reinforcement structure can be provided even when almost no space can be secured in the ground around the foundation structure. It can be performed. Further, the reinforcing structure can be formed with a small amount of the solidifying material, and the foundation can be reinforced while suppressing the cost.

Preferably, a board-like part placed on the ground and a pile-like part suspended from the board-like part and embedded in the ground are provided around the foundation structure. It further includes a foundation slab placement step of placing the foundation slab.
By comprising in this way, since a foundation slab bears the force (horizontal force) concerning a horizontal direction, the deformation | transformation etc. in the horizontal direction of a foundation structure and the structure built on it can be prevented.

According to this invention, a reinforcement structure is formed by inject | pouring a solidification material from the solidification material injection | pouring part formed in the perpendicular direction along the outer edge of a foundation structure.
For this reason, in order to reinforce the foundation, excavation around the existing foundation structure or processing into the foundation structure itself is not required, and the foundation reinforcement work can be performed in a simple and short-term construction.
In addition, since at least a part of the reinforcing structure is arranged directly below the foundation structure, the force applied to the reinforcing structure in the vertical direction (axial force) together with the existing piles existing directly below the foundation structure Bear and support the foundation structure. As a result, it is possible to prevent the occurrence of rotational deformation, distortion, etc. in the axial direction of the foundation structure and the structure built thereon, and prevent subsidence of the foundation over time. Furthermore, even when a structure such as a building is to be constructed, it can be a foundation that can withstand the load. Moreover, since it becomes able to endure the rotational deformation at the time of an earthquake etc., it also has an effect as a seismic reinforcement.
In addition, when the reinforcing structure is formed in a columnar shape with the axis center of the solidifying material injection portion as the center of the circle, the reinforcing structure can be easily formed by the existing construction method and is more stable by the reinforcing structure. And can support the foundation structure.
In addition, when the reinforcing structure is formed in a columnar shape having a cross-sectional fan shape with the center of the axis of the solidifying material injecting portion being the center of the circle, the influence on the periphery of the foundation structure is reduced. In particular, when the entire reinforced structure is arranged directly under the foundation structure, the reinforcement structure can be provided even when almost no space can be secured in the ground around the foundation structure. It can be performed. Further, the amount of the solidifying material forming the reinforcing structure can be reduced, and the construction period can be further shortened, and the cost can be reduced.
In addition, when the foundation slab is arranged around the foundation structure, even when a load is applied in the horizontal direction, it is possible to cope with the foundation slab by applying a horizontal force.

It is a sectional side view which shows the reinforcement structure formed with the foundation reinforcement method in 1st Embodiment, and the foundation reinforcement structure by which this is arrange | positioned. . It is the top view which looked at the foundation reinforcement structure in FIG. 1 from arrow II direction. (A) And (b) is explanatory drawing for demonstrating the force which the reinforcement structure in 1st Embodiment bears. It is a sectional side view which shows the reinforcement structure formed with the foundation reinforcement method in 2nd Embodiment, and the foundation reinforcement structure by which this is arrange | positioned. . It is the top view which looked at the foundation reinforcement structure in FIG. 4 from the arrow V direction. (A) And (b) is explanatory drawing for demonstrating the force which the reinforcement structure in 2nd Embodiment bears. It is a sectional side view which shows the reinforcement structure formed with the foundation reinforcement method in 3rd Embodiment, and the foundation reinforcement structure by which this is arrange | positioned. . (A) And (b) is explanatory drawing for demonstrating the force which the reinforcement structure in 3rd Embodiment bears. It is a sectional side view of the foundation reinforcement structure by the conventional construction method. It is the top view which looked at the foundation reinforcement structure in FIG. 9 from the arrow X direction.

  Hereinafter, an embodiment of a foundation reinforcing structure according to the present invention will be described with reference to the drawings. The embodiments described below are given various technically preferable limitations for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

[First Embodiment]
First, a first embodiment of a foundation reinforcing method according to the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a side cross-sectional view showing a reinforcing structure formed by the foundation reinforcing method according to the present embodiment and the foundation reinforcing structure in which the reinforcing structure is disposed, and FIG. 2 shows the foundation reinforcing structure in FIG. FIG. FIG. 3A and FIG. 3B are explanatory views for explaining the force borne by the reinforcing structure in the present embodiment.

The foundation reinforcement method of this embodiment reinforces the foundation structure 1 already installed on the ground G.
In the case where the existing foundation structure 1 and the existing pile body 2 arranged immediately below the ground G are installed, for example, when building or the like is further added to the foundation structure, seismic reinforcement is performed. When it is necessary to perform the reinforcement, the foundation can be reinforced by providing the reinforcement structure by the foundation reinforcement method of the present embodiment.
In addition, although the case where the existing foundation structure 1 is a pile foundation which has a footing is illustrated in FIG. 1 etc., the existing foundation structure 1 is not limited to this. For example, even when the foundation structure 1 is a direct foundation or a structure having underground beams such as a ramen viaduct, the foundation reinforcement method of the present embodiment can be applied to reinforce the foundation.

In the foundation reinforcement method of this embodiment, first, the solidified material injection part 3 for injecting the solidified material is formed in the ground G along the outer edge of the foundation structure 1 in the vertical direction (injection part forming step). .
The solidifying material is, for example, cement slurry or the like, but is not limited thereto, and any material applicable to various methods (described later) for forming the reinforcing structure 4 can be used as appropriate.
The solidifying material injecting section 3 is constituted by, for example, an injecting pipe (or a hole through which this is inserted) of a solidifying material pump.
The solidifying material injecting portion 3 is provided at a position deeper than the lower surface of the foundation structure 1 and a position corresponding to the lowermost end of the reinforcing structure 4 to be formed.
In addition, in this embodiment, although the reinforcement structure 4 is formed in the same length (depth) as the existing pile body 2 (refer FIG.1 and FIG.3), the length of the reinforcement structure 4 is set to this. It is not limited. The reinforcing structure 4 may be longer or shorter than the existing pile body 2.

When the solidifying material injecting portion 3 is formed, the solidifying material is injected from the solidifying material injecting portion 3 to reinforce the ground G so that at least a part thereof is disposed immediately below the foundation structure 1. The structure 4 is formed (reinforcing structure forming step).
The shape, size, and the like of the reinforcing structure 4 are not particularly limited, but in this embodiment, the reinforcing structure 4 is formed in a columnar shape with the center of the axis of the solidified material injecting portion 3 as a circular center.
In addition, at least a part of the reinforcing structure 4 disposed immediately below the foundation structure 1 may be provided. However, as shown in FIG. 2, the reinforcing structure 4 of the present embodiment is substantially half of a cylinder. Is arranged directly under the foundation structure 1.
In addition, although the reinforcement structure 4 contacts the lower surface of the foundation structure 1, it is not integrated with the foundation structure 1.

Although the number and arrangement | positioning which form the reinforcement structure 4 are not specifically limited, The force which supports the foundation structure 1 improves, so that the number of the reinforcement structures 4 is large. In addition, it is preferable to arrange the reinforcing structure 4 below the foundation structure 1 in a well-balanced manner because it can be expected that the foundation structure 1 is uniformly supported from the lower side.
In the present embodiment, as shown in FIG. 2, the reinforcement structure is formed so as to surround the existing pile bodies 2 arranged immediately below the foundation structure 1, three by three along each side of the rectangular foundation structure 1. A body 4 is formed.

Here, as a method for creating a structure in the ground G, for example, a high-pressure jet agitation method, a mechanical agitation method, a high-pressure injection combined type mechanical agitation method, and the like are known. Using this technique, it can be formed in the ground G along the vertical direction. In addition, since the solidification material pump used for these construction methods is the same as a well-known thing, it is not explained in full detail here.
Each method will be specifically described below.

In the high-pressure jet stirring method, a solidifying material pumping machine (not shown) is installed on the ground G, and then the solidifying material injection portion 3 for injecting the solidifying material is formed. Specifically, the injection pipe of the solidifying material feeder is press-fitted into the ground G in a vertical posture and inserted until the tip of the injection pipe reaches a desired position deeper than the lower surface of the foundation structure 1. This injection tube functions as a solidifying material injection portion 3 for injecting the solidifying material. Alternatively, the solidified material injection part 3 may be configured by cutting a hole in the ground G in advance and inserting an injection tube into the hole.
Thereafter, the injection tube is gradually pulled up while rotating. At that time, the solidification material is supplied to the injection tube at a high pressure, and the solidification material is injected at a high pressure outward from the injection nozzle at the tip of the injection tube. By doing this, the earth and sand around the injection pipe is cut with the solidified material injected with high pressure, and the diameter of the hole in the ground G is expanded concentrically with the axial center of the injection portion 3 as the center of the circle. The solidified material and earth and sand are mixed and stirred by the swirling jet of the solidified material. Thereby, the reinforcement structure 4 is vertically formed toward the upper part from the downward direction.

  In the mechanical agitation method, a solidifying material feeder is installed on the ground G, and by rotating the injection pipe in a vertical posture, while cutting the ground G with a bit or a sword tip provided at the tip of the injection pipe, The injection tube is inserted vertically into the ground G. When the injection tube is inserted until the tip of the injection tube reaches a desired position deeper than the lower surface of the foundation structure 1, the injection tube is gradually pulled up while being reversely rotated. At that time, by supplying the solidification material to the injection tube, the solidification material is blown out from the tip portion of the injection tube, and the solidification material and the earth and sand are mixed and stirred by the stirring blade provided at the tip portion and / or the outer peripheral surface of the injection tube. . Thereby, the reinforcement structure 4 is vertically formed toward the upper part from the downward direction. Instead of blowing out the solidifying material when the injection tube is pulled up from the ground, the solidifying material may be blown out from the tip of the injection tube when the injection tube is inserted into the ground G.

  The high-pressure jet combined mechanical stirring method is a combination of the above-described high-pressure jet stirring method and mechanical stirring method. That is, by rotating the injection pipe in a vertical posture, the injection pipe is inserted vertically into the ground G while cutting the ground G with a bit or a sword tip provided at the tip of the injection pipe. At that time, the solidification material is supplied to the injection tube to blow out the solidification material from the injection tube, and the solidification material and the earth and sand are mixed and stirred by the stirring blades provided at the tip and / or the outer peripheral surface of the injection tube. When the injection tube is inserted until the tip of the injection tube reaches a desired position deeper than the lower surface of the foundation structure 1, the injection tube is gradually pulled up while being reversely rotated. At that time, the solidification material is supplied to the injection pipe at a high pressure, so that the solidification material is injected in a high pressure outward from the injection nozzle provided in the stirring blade. The earth and sand and the solidified material near the injection pipe are mixed and stirred by the stirring blade, and the surrounding earth and sand and the solidified material separated from the injection pipe are mixed and stirred by the swirling jet of the high-pressure jetted solidification material. Thereby, the reinforcement structure 4 is formed vertically.

  As described above, when the mixture of the solidified material and earth and sand injected into the ground G is cured so as to be left for a predetermined time and the mixture is solidified (hardened), the ground G is aligned in the vertical direction. A reinforcing structure 4 is formed.

  A plurality of the above-described steps are performed while changing the formation position (the position where the solidifying material injection portion 3 is formed, that is, the position where the injection pipe of the solidifying material feeder is inserted into the ground G) along the outer edge of the foundation structure 1. By performing the rotation, the reinforcing structures 4 are formed in a row along each side of the foundation structure 1. Thereby, the foundation reinforcement structure 100 is completed.

  In the foundation reinforcement structure 100 in which the reinforcement structure 4 formed by the foundation reinforcement method in the present embodiment is disposed, the reinforcement structure 4 is in the vertical direction as shown by arrows in FIGS. 3 (a) and 3 (b). The base structure 1 is supported by bearing the force (axial force) applied to the base structure 1 and rotational deformation (see FIG. 3A) and settlement (FIG. 3B) of the base structure 1 and the structure built thereon. ))) Can be suppressed.

As described above, according to the present embodiment, the reinforcing structure 4 is formed by injecting the solidifying material from the solidifying material injecting portion 3 formed in the vertical direction along the outer edge of the foundation structure 1.
For this reason, in order to reinforce the foundation, excavation around the existing foundation structure 1 or processing into the foundation structure 1 itself is not required, and the foundation can be reinforced in a simple and relatively short period of time. it can.
In addition, since at least a part of the reinforcing structure 4 is disposed directly below the foundation structure 1, the force applied to the reinforcing structure 4 in the vertical direction together with the existing pile body 2 existing immediately below the foundation structure 1 ( It is possible to bear the axial force) and support the foundation structure 1 and to suppress deformation and settlement of the foundation structure 1 and the structure built thereon. Accordingly, it is possible to prevent the foundation from being deformed and subducted at all times, and to prevent the foundation from being rotationally deformed during an earthquake or the like.
In addition, since the reinforcing structure 4 is formed in a columnar shape with the solidifying material injecting portion 3 as the center of the circle, the reinforcing structure 4 can be easily formed by an existing method, and the reinforcing structure 4 The foundation structure 1 can be supported stably.

[Second Embodiment]
First, a second embodiment of the foundation reinforcing method according to the present invention will be described with reference to FIGS. 4 to 6.
FIG. 4 is a side sectional view showing a reinforcing structure formed by the foundation reinforcing method according to the present embodiment and the foundation reinforcing structure in which the reinforcing structure is disposed. FIG. 5 shows the foundation reinforcing structure in FIG. FIG. FIG. 6A and FIG. 6B are explanatory diagrams for explaining the force borne by the reinforcing structure in the present embodiment.

  The foundation reinforcement method of this embodiment forms the solidification material injection | pouring part 3 for inject | pouring a solidification material vertically in the ground G along the outer edge of the foundation structure 1 similarly to 1st Embodiment. The reinforcing structure 5 is formed in the ground G so that at least a part thereof is disposed immediately below the foundation structure 1 by injecting the solidifying material from the injecting portion forming step and the solidifying material injecting portion 3. And a reinforcing structure forming step.

In the present embodiment, in the reinforcing structure forming step, the reinforcing structure is formed into a substantially semi-cylindrical shape (that is, a columnar shape having a fan-shaped cross section with a central angle of approximately 180 degrees) with the axial center of the solidifying material injection portion 3 as the center of the circle. Form body 5.
Specifically, in various methods for creating a structure in the ground G as described in the first embodiment, by rotating the injection tube half a turn by 180 degrees, As shown in FIG. 5, a substantially semi-cylindrical reinforcing structure 5 that is disposed almost directly below the foundation structure 1 is formed.

The cross-sectional shape of the reinforcing structure 5 formed in the reinforcing structure forming step may be a columnar shape having a substantially fan shape with the axial center of the solidifying material injecting portion 3 as a circle center. Etc. are not limited to the illustrated examples. For example, the reinforcing structure 5 may have a sector central angle smaller or larger than 180 degrees.
Moreover, it is not limited to the case where the whole reinforcement structure 5 is arrange | positioned directly under the foundation structure 1, The one part may be arrange | positioned so that it may protrude outside directly under the foundation structure 1. FIG.

Moreover, the number and arrangement | positioning which form the reinforcement structure 5 are not specifically limited, The force which supports the foundation structure 1 improves, so that there are many reinforcement structures 5. As shown in FIG. In addition, it is preferable to arrange the reinforcing structure 5 below the foundation structure 1 in a well-balanced manner because it can be expected that the foundation structure 1 is uniformly supported from the lower side.
In the present embodiment, as shown in FIG. 5, the reinforcement structure is formed so as to surround the existing pile bodies 2 arranged immediately below the foundation structure 1, three by three along each side of the rectangular foundation structure 1. A body 5 is formed.

  Since the other points are the same as those of the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted.

  In the foundation reinforcement structure 200 in which the reinforcement structure 5 formed by the foundation reinforcement method in the present embodiment is arranged, as shown by arrows in FIGS. 6A and 6B, as in the first embodiment. The reinforcing structure 5 bears a force (axial force) applied in the vertical direction to support the foundation structure 1 and rotational deformation of the foundation structure 1 and the structure built thereon (see FIG. 6A). ) And settlement (see FIG. 6B) can be suppressed.

As described above, according to the present embodiment, the following effects can be obtained in addition to the same effects as those of the first embodiment.
That is, in this embodiment, the reinforcing structure 5 is formed in a columnar shape having a sectoral cross section with the axial center of the solidifying material injecting portion 3 as the center of the circle. For this reason, the influence on the surroundings of the foundation structure 1 becomes less. In particular, as illustrated in the present embodiment, when the entire reinforcing structure 5 is disposed directly below the foundation structure 1, even when almost no space can be secured in the ground G around the foundation structure 1. The reinforcing structure 5 can be provided and the foundation can be reinforced.
Further, since the amount of the solidifying material that forms the reinforcing structure 5 can be reduced, the construction period can be further shortened and the cost can be reduced.

[Third Embodiment]
First, a third embodiment of the foundation reinforcing method according to the present invention will be described with reference to FIGS. 7 and 8.
FIG. 7 is a side sectional view showing the reinforcing structure formed by the foundation reinforcing method and the foundation reinforcing structure in which the reinforcing structure is arranged in the present embodiment. FIGS. 8A and 8B show the embodiment. It is explanatory drawing for demonstrating the force which the reinforcement structure in [in].

  The foundation reinforcement method of this embodiment is similar to the first embodiment and the second embodiment. The solidification material injecting portion 3 for injecting the solidification material is provided on the ground G along the outer edge of the foundation structure 1. By injecting the solidified material from the solidified material injecting portion 3 and the injecting portion forming step to be formed in the vertical direction, at least a part of the ground G is disposed immediately below the foundation structure 1. A reinforcing structure forming step for forming the reinforcing structure 4.

In the present embodiment, in the reinforcing structure forming step, the reinforcing structure 4 is formed in a columnar shape with the axial center of the solidifying material injecting portion 3 as the center of the circle, as in the first embodiment.
In addition, since the method of forming the reinforcing structure 4 and the configuration of the reinforcing structure 4 are the same as those in the first embodiment, the description thereof is omitted.

Moreover, in the foundation reinforcement method of this embodiment, the board-like part 71 mounted on the ground G around the foundation structure 1, and is suspended from the board-like part 71 and embedded in the ground G. The foundation slab 7 provided with the pile-shaped part 72 is arranged (foundation slab arrangement process). In addition, the board-shaped part 71 and the pile-shaped part 72 which comprise the foundation slab 7 are comprised integrally.
Specifically, after the reinforcement structure 4 is formed in the ground G by the method described in the first embodiment, the foundation slab 7 is disposed around the foundation structure 1 and the ground G is placed on the ground G. The pile portion 72 is embedded in the ground G, leaving the plate portion 71.

  Since the other points are the same as those of the first embodiment, the same members are denoted by the same reference numerals and the description thereof is omitted.

In the foundation reinforcement structure 300 in which the reinforcement structure 4 formed by the foundation reinforcement method in the present embodiment is arranged, as shown by arrows in FIGS. 8A and 8B, as in the first embodiment. The reinforcement structure 4 bears a force (axial force) applied in the vertical direction to support the foundation structure 1 and rotational deformation of the foundation structure 1 and the structure built thereon (see FIG. 8A). ) And settlement (see FIG. 8B).
Further, since the foundation slab 7 is disposed around the foundation structure 1, the foundation slab 7 can be applied with a horizontal force even when a load is applied to the foundation structure 1 in the horizontal direction, as shown in FIG. 8. We can cope by paying.

As described above, according to the present embodiment, the following effects can be obtained in addition to the same effects as those of the first embodiment.
That is, in this embodiment, by arranging the foundation slab 7 around the foundation structure 1, the foundation slab 7 bears a horizontal force even when a load is applied to the foundation structure 1 in the horizontal direction. Can respond.

In the present embodiment, in the reinforcing structure forming step, the case where the reinforcing structure 4 is formed in a columnar shape with the axial center of the solidifying material injecting portion 3 as the center of the circle is described as an example. Etc. are not limited to this.
For example, as in the second embodiment, a columnar reinforcing structure 5 having a sectoral cross section with the axial center of the solidifying material injecting portion 3 as the center is formed, and a foundation slab 7 is provided around the foundation structure 1. Even if it arranges, the same effect can be acquired.

  Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Foundation structure 2 Existing pile 3 Solidification material injection part 4 Reinforcement structure 100 Foundation reinforcement structure

Claims (4)

A foundation reinforcement method for reinforcing an existing foundation structure,
An injection part forming step of forming a solidifying material injection part in a vertical direction along the outer edge of the foundation structure;
Reinforcing structure forming step of forming a reinforcing structure so that at least a part thereof is disposed directly below the foundation structure by injecting the solidifying material from the solidifying material injection portion;
A foundation reinforcing method characterized by containing.   The said reinforcement structure formation process forms the said reinforcement structure in the column shape which made the center of the axis | shaft of the said solidification material injection | pouring part a circle center, The base reinforcement method of Claim 1 characterized by the above-mentioned.   The said reinforcement structure formation process forms the said reinforcement structure in the column shape used as the cross-sectional fan shape centering on the axial center of the said solidification material injection | pouring part as a circle center, The base reinforcement method of Claim 1 characterized by the above-mentioned.   Around the foundation structure, a foundation slab including a board-like part placed on the ground and a pile-like part suspended from the board-like part and embedded in the ground is disposed. The foundation reinforcement method according to any one of claims 1 to 3, further comprising a foundation slab arranging step.

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