JP2016160700A - Foundation reinforcement method - Google Patents

Foundation reinforcement method Download PDF

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JP2016160700A
JP2016160700A JP2015041994A JP2015041994A JP2016160700A JP 2016160700 A JP2016160700 A JP 2016160700A JP 2015041994 A JP2015041994 A JP 2015041994A JP 2015041994 A JP2015041994 A JP 2015041994A JP 2016160700 A JP2016160700 A JP 2016160700A
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foundation
reinforcement
reinforcing
foundation structure
ground
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谷口 善則
Yoshinori Taniguchi
善則 谷口
秀明 高崎
Hideaki Takasaki
秀明 高崎
淳 金田
Atsushi Kaneda
淳 金田
宏文 池本
Hirofumi Ikemoto
宏文 池本
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East Japan Railway Co
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East Japan Railway Co
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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

本発明は、基礎補強方法に関し、特に既存の基礎構造体の補強を行う基礎補強方法に関する。   The present invention relates to a foundation reinforcing method, and more particularly to a foundation reinforcing method for reinforcing an existing foundation structure.

建物等の構造物を建設する際には、建物等を支持する基礎を強固なものとして基礎及び基礎上の建物の沈み込みを防ぐ工夫として、フーチング基礎等の基礎構造体の下に複数の杭体を設けて補強することが行われている。   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.

しかし、基礎構造体の上にさらに建物等の構造物を建設することとなった場合等には、既存の杭体だけでは荷重に耐えられなくなるおそれがある。また耐震補強を行うために、増杭をして基礎の強化を図りたい場合もあり、各種の基礎の補強が行われている。   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.

図9及び図10に基礎を補強するための従来工法の一例を図示する。図9は、従来の工法による基礎補強構造の側断面図であり、図10は、図9における基礎補強構造を矢視X方向から見た平面図である。
図9及び図10に示すように、従来の一般的な工法では、下方に既存杭体2が配置されている既存の基礎構造体1の外周を基礎構造体1の底面とほぼ同じ高さとなる深さまで掘削して掘削部501を形成し、この掘削部501内に新たな杭体(増杭502)を打設した後に、既存の基礎構造体1をこの増杭502を覆う位置まで増設した増設部503を形成する。
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.

しかし都市部等においては、掘削部501を形成するための施工用地が既存の基礎構造体1の周囲に十分確保することができない場合がある。
そこで、例えば特許文献1には、既存の基礎構造体に上下に貫通する貫通孔を設けてこの貫通孔を用いて高圧噴射置換工法により既存の基礎構造体の直下に円柱状の地盤改良体を構築することが提案されている。
このような手法によれば、既存の基礎構造体の周囲に既設の建造物等があって掘削部を形成できない場合でも地盤の補強を行うことができる。
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.

特開2001−279667号公報JP 2001-279667 A

しかしながら、特許文献1に記載の手法では、既存の基礎構造体の上にすでに店舗等の建造物が存在している場合には、基礎構造体に貫通孔を設けて工事を行うのに支障となり、施工にあたって借地や移転等の協議が必要となる場合もある。   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.

本発明は以上のような事情に鑑みてなされたものであり、既存の基礎構造体の周囲の掘削や基礎構造体自体への加工を要せずに、基礎を補強することができる基礎補強方法を提供することを目的とするものである。   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.

前記課題を解決するために、本出願の発明である基礎補強方法は、
既設の基礎構造体を補強する基礎補強方法であって、
固化材注入部を前記基礎構造体の外側縁に沿って鉛直方向に形成する注入部形成工程と、
前記固化材注入部から固化材を注入することにより、少なくともその一部が前記基礎構造体の直下に配置されるように補強構造体を形成する補強構造体形成工程と、
を含んでいる。
このように構成することで、既存の基礎構造体の周囲を掘削して掘削部を設けたり、基礎構造体自体に貫通孔を穿設する等の必要がなく、簡易かつ比較的短い工期で既存の基礎構造体を補強することができる。
補強構造体が鉛直方向にかかる力(軸力)を負担して既存の基礎構造体を支持することができるため、基礎構造体及びこの上に建築される構造物の軸方向における回転変形、歪み等を防止することができる。
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.

また、前記補強構造体形成工程は、前記固化材注入部の軸中心を円中心とした円柱状に前記補強構造体を形成する。
このように構成することで、例えば、高圧噴射撹拌工法、機械撹拌工法、高圧噴射併用型機械攪拌工法等の既存の工法によって、補強構造体を簡易に形成することができる。
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.

また、好ましくは、前記補強構造体形成工程は、前記固化材注入部の軸中心を円中心とした断面扇形となる柱状に前記補強構造体を形成する。
このように構成することで、基礎構造体の周囲への影響がより少なくなる。特に、補強構造体の全体が基礎構造体の直下に配置される場合には、基礎構造体の周囲の地盤にほとんどスペースが確保できないような場合でも補強構造体を設けることができ、基礎の補強を行うことができる。また、少ない量の固化材で補強構造体を形成することができ、コストを抑えつつ基礎の補強を行うことができる。
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.

また、好ましくは、前記基礎構造体の周囲に、前記地盤の上に載置される盤状部と、前記盤状部から垂設されて前記地盤内に埋設される杭状部と、を備える基礎スラブを配置する基礎スラブ配置工程をさらに含んでいる。
このように構成することで、基礎スラブが水平方向にかかる力(水平力)を負担するため、基礎構造体及びこの上に建築される構造物の水平方向における変形等を防ぐことができる。
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.

本発明によれば、基礎構造体の外側縁に沿って鉛直方向に形成された固化材注入部から固化材を注入することで補強構造体が形成される。
このため、基礎を補強するために既存の基礎構造体の周囲の掘削や基礎構造体自体への加工を要せず、簡易かつ短期の施工で基礎補強工事を行うことができる。
また、補強構造体は、その少なくとも一部が基礎構造体の直下に配置されるため、基礎構造体の直下に存在する既存の杭体とともに補強構造体が鉛直方向にかかる力(軸力)を負担して基礎構造体を支持する。これにより、基礎構造体及びこの上に建築される構造物の軸方向における回転変形、歪み等の発生を防止することができ、経時的な基礎の沈み込みを防ぐとともに、基礎構造体の上にさらに建物等の構造物を建設することとなった場合等でも、その荷重に耐えられる基礎とすることができる。また、地震等の際の回転変形にも耐えることができるようになるため、耐震補強としての効果も有する。
また、補強構造体を固化材注入部の軸中心を円中心とした円柱状に形成した場合には、既存の工法によって、補強構造体を簡易に形成することができるとともに、補強構造体により安定して基礎構造体を支えることができる。
また、補強構造体を固化材注入部の軸中心を円中心とした断面扇形となる柱状に形成した場合には、基礎構造体の周囲への影響がより少なくなる。特に、補強構造体の全体が基礎構造体の直下に配置される場合には、基礎構造体の周囲の地盤にほとんどスペースが確保できないような場合でも補強構造体を設けることができ、基礎の補強を行うことができる。また、補強構造体を形成する固化材の量が少なくて済み、より一層工期の短縮が図れるとともに、コストを削減することができる。
また、基礎構造体の周囲に、基礎スラブを配置した場合には、水平方向に負荷がかかった場合にも基礎スラブが水平力を負担することで対応することが可能となる。
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.

第1の実施形態における基礎補強方法で形成された補強構造体及びこれが配置される基礎補強構造を示す側断面図である。。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. . 図1における基礎補強構造を矢視II方向から見た平面図である。It is the top view which looked at the foundation reinforcement structure in FIG. 1 from arrow II direction. (a)及び(b)は、第1の実施形態における補強構造体が負担する力を説明するための説明図である。(A) And (b) is explanatory drawing for demonstrating the force which the reinforcement structure in 1st Embodiment bears. 第2の実施形態における基礎補強方法で形成された補強構造体及びこれが配置される基礎補強構造を示す側断面図である。。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. . 図4における基礎補強構造を矢視V方向から見た平面図である。It is the top view which looked at the foundation reinforcement structure in FIG. 4 from the arrow V direction. (a)及び(b)は、第2の実施形態における補強構造体が負担する力を説明するための説明図である。(A) And (b) is explanatory drawing for demonstrating the force which the reinforcement structure in 2nd Embodiment bears. 第3の実施形態における基礎補強方法で形成された補強構造体及びこれが配置される基礎補強構造を示す側断面図である。。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)及び(b)は、第3の実施形態における補強構造体が負担する力を説明するための説明図である。(A) And (b) is explanatory drawing for demonstrating the force which the reinforcement structure in 3rd Embodiment bears. 従来の工法による基礎補強構造の側断面図である。It is a sectional side view of the foundation reinforcement structure by the conventional construction method. 図9における基礎補強構造を矢視X方向から見た平面図である。It is the top view which looked at the foundation reinforcement structure in FIG. 9 from the arrow X direction.

以下、図面を参照して、本発明に係る基礎補強構造の実施形態について説明する。なお、以下に述べる実施形態には、本発明を実施するために技術的に好ましい種々の限定が付されているが、本発明の範囲を以下の実施形態及び図示例に限定するものではない。   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.

[第1の実施形態]
まず、図1から図3を参照しつつ、本発明に係る基礎補強方法の第1の実施形態について説明する。
図1は、本実施形態における基礎補強方法で形成された補強構造体及びこれが配置される基礎補強構造を示す側断面図であり、図2は、図1における基礎補強構造を矢視II方向から見た平面図である。また、図3(a)及び図3(b)は、本実施形態における補強構造体が負担する力を説明するための説明図である。
[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.

本実施形態の基礎補強方法は、地盤Gに既設された基礎構造体1を補強するものである。
地盤Gに既存の基礎構造体1及びその直下に配置された既存杭体2が設置されている場合において、例えば、この基礎構造体の上にさらに建造物等を増設する場合や、耐震補強を行う等の必要が生じた場合には、本実施形態の基礎補強方法により補強構造体を設けることで基礎の補強を図ることができる。
なお、図1等では既存の基礎構造体1がフーチングを有する杭基礎である場合を例示しているが、既存の基礎構造体1はこれに限定されない。例えば基礎構造体1が直接基礎である場合やラーメン高架橋のように地中梁を有する構造である場合などにおいても本実施形態の基礎補強方法を適用して基礎の補強を図ることができる。
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.

本実施形態の基礎補強方法では、まず、固化材を注入するための固化材注入部3を基礎構造体1の外側縁に沿って地盤Gの中に鉛直方向に形成する(注入部形成工程)。
固化材は、例えばセメントスラリー等であるが、これに限定されず、補強構造体4を形成する各種工法(後述)に適用可能なものを適宜用いることができる。
固化材注入部3は、例えば固化材圧送機の注入管(又はこれを挿通させるための孔)で構成されている。
固化材注入部3は、基礎構造体1の下面よりも深い位置であって形成したい補強構造体4の最下端にあたる位置まで設ける。
なお、本実施形態では、補強構造体4は既存杭体2と同じ長さ(深さ)に形成されていているが(図1及び図3参照)、補強構造体4の長さはこれに限定されない。補強構造体4は、既存杭体2よりも長くしてもよいし、短くてもよい。
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.

固化材注入部3が形成されると、この固化材注入部3から固化材を注入することにより、地盤Gの中に、少なくともその一部が基礎構造体1の直下に配置されるように補強構造体4を形成する(補強構造体形成工程)。
補強構造体4の形状・大きさ等は特に限定されないが、本実施形態では、固化材注入部3の軸中心を円中心とした円柱状に補強構造体4が形成される。
また、補強構造体4において基礎構造体1の直下に配置される部分は少なくともその一部であればよいが、図2に示すように、本実施形態の補強構造体4は、円柱のほぼ半分が基礎構造体1の直下に配置される。
なお、補強構造体4は、基礎構造体1の下面に接触するが、基礎構造体1と一体化されるものではない。
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.

補強構造体4を形成する数や配置は特に限定されないが、補強構造体4の数が多いほど基礎構造体1を支持する力が向上する。また、補強構造体4を基礎構造体1の下方にバランス良く配置する方が、基礎構造体1を下側から均一に支持することが期待でき、好ましい。
本実施形態では、図2に示すように、矩形状の基礎構造体1の各辺に沿って3つずつ、基礎構造体1の直下に配置された既存杭体2を取り囲むように、補強構造体4が形成される。
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.

ここで、地盤Gの中に構造体を造成する手法としては、例えば、高圧噴射撹拌工法、機械撹拌工法、高圧噴射併用型機械攪拌工法等が知られており、補強構造体4は、これら周知の技術を利用して、地盤G中に鉛直方向に沿って形成することができる。なお、これらの工法に用いる固化材圧送機は周知のものと同様であるので、ここでは詳述しない。
以下各工法について具体的に説明する。
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.

高圧噴射撹拌工法では、地盤G上に図示しない固化材圧送機を設置した後、固化材を注入するための固化材注入部3を形成する。具体的には、固化材圧送機の注入管を鉛直な姿勢で地盤G内に圧入し、注入管の先端が基礎構造体1の下面よりも深い所望の位置に達するまで挿入する。この注入管が固化材を注入するための固化材注入部3として機能する。なお、事前に地盤Gに孔を削孔した上で、その孔に注入管を挿入することで固化材注入部3を構成してもよい。
その後、注入管を回転させつつ徐々に引き上げる。その際に、注入管に固化材を高圧で供給して、注入管の先端部の噴射ノズルから径方向外方へ固化材を高圧噴射する。こうすることで、高圧噴射された固化材によって注入管の周囲の土砂を切削して地盤G中の孔の径を注入部3の軸中心を円中心として同心円状に広げるとともに、高圧噴射された固化材の旋回噴流によって固化材と土砂とを混合撹拌する。これにより、補強構造体4を下方から上方へ向かって鉛直に造成する。
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.

機械撹拌工法では、地盤G上に固化材圧送機を設置し、鉛直な姿勢の注入管を回転させることによって、注入管の先端部に設けられたビット又は剣先等で地盤Gを切削しながら、注入管を地盤G内に鉛直に挿入する。注入管の先端部が基礎構造体1の下面よりも深い所望の位置に達するまで挿入したら、注入管を逆回転させつつ徐々に引き上げる。その際に、注入管に固化材を供給することによって注入管の先端部から固化材を吹き出し、注入管の先端部及び/又は外周面に設けられた撹拌羽根で固化材と土砂を混合撹拌する。これにより、補強構造体4を下方から上方へ向かって鉛直に造成する。なお、注入管を地中から引き上げる際に固化材を吹き出すのではなく、注入管を地盤G中に挿入する際に固化材を注入管の先端部から吹き出してもよい。   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.

高圧噴射併用型機械攪拌工法は、上述の高圧噴射撹拌工法と機械撹拌工法を併用したものである。つまり、鉛直な姿勢の注入管を回転させることによって、注入管の先端部に設けられたビット又は剣先等で地盤Gを切削しながら、注入管を地盤G内に鉛直に挿入する。その際に、注入管に固化材を供給することによって注入管から固化材を吹き出し、注入管の先端部及び/又は外周面に設けられた撹拌羽根で固化材と土砂を混合撹拌する。注入管の先端部が基礎構造体1の下面よりも深い所望の位置に達するまで挿入したら、注入管を逆回転させつつ徐々に引き上げる。その際に、注入管に固化材を高圧で供給することによって、撹拌羽根に設けられた噴射ノズルから径方向外方へ固化材を高圧噴射する。注入管に近い中心部の土砂及び固化材は、撹拌羽根によって混合撹拌され、注入管から離れた周囲部の土砂及び固化材は、高圧噴射された固化材の旋回噴流によって混合撹拌される。これにより、補強構造体4を鉛直に造成する。   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.

上記のようにして、地盤G内に注入された固化材と土砂の混合体を所定時間放置するように養生してその混合体を固化(硬化)させると、地盤G中に鉛直方向に沿った補強構造体4が形成される。   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.

そして、基礎構造体1の外側縁に沿って造成位置(固化材注入部3を形成する位置、すなわち、地盤Gに固化材圧送機の注入管を挿入する位置)を変えながら上記した工程を複数回行うことによって、補強構造体4を基礎構造体1の各辺に沿って列を成すように形成する。これにより、基礎補強構造100が完成する。   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.

本実施形態における基礎補強方法で形成された補強構造体4が配置される基礎補強構造100では、図3(a)及び図3(b)において矢印で示すように、補強構造体4が鉛直方向にかかる力(軸力)を負担して基礎構造体1を支持し、基礎構造体1及びこの上に建築される構造物の回転変形(図3(a)参照)及び沈下(図3(b)参照)等を抑えることができる。   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.

以上のように、本実施形態によれば、基礎構造体1の外側縁に沿って鉛直方向に形成された固化材注入部3から固化材を注入することで補強構造体4が形成される。
このため、基礎を補強するために既存の基礎構造体1の周囲の掘削や基礎構造体1自体への加工を要せず、簡易かつ比較的短期間の施工で基礎の補強工事を行うことができる。
また、補強構造体4は、その少なくとも一部が基礎構造体1の直下に配置されるため、基礎構造体1の直下に存在する既存杭体2とともに補強構造体4が鉛直方向にかかる力(軸力)を負担して基礎構造体1を支持し、基礎構造体1及びこの上に建築される構造物の変形及び沈下等を抑えることができる。これにより、常時における基礎の変形や沈み込みを防ぐともに、地震等の際に、基礎が回転変形することを抑制することができる。
また、補強構造体4を固化材注入部3を円中心とした円柱状に形成しているため、既存の工法によって、補強構造体4を簡易に形成することができるとともに、補強構造体4により安定して基礎構造体1を支えることができる。
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.

[第2の実施形態]
まず、図4から図6を参照しつつ、本発明に係る基礎補強方法の第2の実施形態について説明する。
図4は、本実施形態における基礎補強方法で形成された補強構造体及びこれが配置される基礎補強構造を示す側断面図であり、図5は、図4における基礎補強構造を矢視V方向から見た平面図である。また、図6(a)及び図6(b)は、本実施形態における補強構造体が負担する力を説明するための説明図である。
[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.

本実施形態の基礎補強方法は、第1の実施形態と同様に、固化材を注入するための固化材注入部3を基礎構造体1の外側縁に沿って地盤Gの中に鉛直方向に形成する注入部形成工程と、固化材注入部3から固化材を注入することにより、地盤Gの中に、少なくともその一部が基礎構造体1の直下に配置されるように補強構造体5を形成する補強構造体形成工程とを備えている。   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.

本実施形態では、補強構造体形成工程において、固化材注入部3の軸中心を円中心としたほぼ半円柱状(すなわち、中心角がほぼ180度の扇形の断面形状となる柱状)に補強構造体5を形成する。
具体的には、第1の実施形態で説明したような地盤Gの中に構造体を造成する各種手法において、注入管を180度ずつ半回転させることにより、地盤Gの中に、図4及び図5に示すような、ほぼ全部が基礎構造体1の直下に配置されるほぼ半円柱状の補強構造体5を形成する。
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.

なお、補強構造体形成工程において形成される補強構造体5は、その断面形状が、固化材注入部3の軸中心を円中心としたほぼ扇形となる柱状であればよく、その形状・大きさ等は図示例に限定されない。例えば補強構造体5は扇形の中心角が180度よりも小さくても大きくてもよい。
また、補強構造体5の全体が基礎構造体1の直下に配置される場合に限定されず、その一部が基礎構造体1の直下よりも外側にはみ出すように配置されていてもよい。
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.

また、補強構造体5を形成する数や配置は特に限定されないが、補強構造体5の数が多いほど基礎構造体1を支持する力が向上する。また、補強構造体5を基礎構造体1の下方にバランス良く配置する方が、基礎構造体1を下側から均一に支持することが期待でき、好ましい。
本実施形態では、図5に示すように、矩形状の基礎構造体1の各辺に沿って3つずつ、基礎構造体1の直下に配置された既存杭体2を取り囲むように、補強構造体5が形成される。
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.

なお、その他の点は、第1の実施形態と同様であるため、同一部材には同一の符号を付してその説明を省略する。   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.

本実施形態における基礎補強方法で形成された補強構造体5が配置される基礎補強構造200では、第1の実施形態と同様、図6(a)及び図6(b)において矢印で示すように、補強構造体5が鉛直方向にかかる力(軸力)を負担して基礎構造体1を支持し、基礎構造体1及びこの上に建築される構造物の回転変形(図6(a)参照)及び沈下(図6(b)参照)等を抑えることができる。   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.

以上のように、本実施形態によれば、第1の実施形態と同様の効果を得られる他、以下の効果を得ることができる。
すなわち、本実施形態では、補強構造体5が固化材注入部3の軸中心を円中心とした断面扇形となる柱状に形成されている。このため、基礎構造体1の周囲への影響がより少なくなる。特に本実施形態で図示したように、補強構造体5の全体が基礎構造体1の直下に配置される場合には、基礎構造体1の周囲の地盤Gにほとんどスペースが確保できないような場合でも補強構造体5を設けることができ、基礎の補強を行うことができる。
また、補強構造体5を形成する固化材の量が少なくて済むため、より一層工期の短縮が図れるとともに、コストを削減することができる。
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.

[第3の実施形態]
まず、図7及び図8を参照しつつ、本発明に係る基礎補強方法の第3の実施形態について説明する。
図7は、本実施形態における基礎補強方法で形成された補強構造体及びこれが配置される基礎補強構造を示す側断面図であり、図8(a)及び図8(b)は、本実施形態における補強構造体が負担する力を説明するための説明図である。
[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].

本実施形態の基礎補強方法は、第1の実施形態及び第2の実施形態と同様に、固化材を注入するための固化材注入部3を基礎構造体1の外側縁に沿って地盤Gの中に鉛直方向に形成する注入部形成工程と、固化材注入部3から固化材を注入することにより、地盤Gの中に、少なくともその一部が基礎構造体1の直下に配置されるように補強構造体4を形成する補強構造体形成工程とを備えている。   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.

本実施形態では、補強構造体形成工程において、第1の実施形態と同様に、固化材注入部3の軸中心を円中心とした円柱状に補強構造体4を形成する。
なお、補強構造体4を形成する手法や補強構造体4の構成等は、第1の実施形態と同様であるため、その説明を省略する。
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.

また、本実施形態の基礎補強方法では、基礎構造体1の周囲に、地盤Gの上に載置される盤状部71と、この盤状部71から垂設されて地盤G内に埋設される杭状部72とを備える基礎スラブ7が配置される(基礎スラブ配置工程)。なお、基礎スラブ7を構成する盤状部71及び杭状部72は一体的に構成されている。
具体的には、第1の実施形態で説明したような手法により地盤Gの中に補強構造体4を形成した後、基礎構造体1の周囲に基礎スラブ7を配置し、地盤Gの上に盤状部71を残して、杭状部72を地盤Gの中に埋め込む。
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.

なお、その他の点は、第1の実施形態と同様であるため、同一部材には同一の符号を付してその説明を省略する。   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.

本実施形態における基礎補強方法で形成された補強構造体4が配置される基礎補強構造300では、第1の実施形態と同様、図8(a)及び図8(b)において矢印で示すように、補強構造体4が鉛直方向にかかる力(軸力)を負担して基礎構造体1を支持し、基礎構造体1及びこの上に建築される構造物の回転変形(図8(a)参照)及び沈下(図8(b)参照)等を抑えることができる。
さらに、基礎構造体1の周囲に基礎スラブ7が配置されていることにより、図8に示すように、基礎構造体1に対して水平方向に負荷がかかった場合にも基礎スラブ7が水平力を負担することで対応することができる。
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.

以上のように、本実施形態によれば、第1の実施形態と同様の効果を得られる他、以下の効果を得ることができる。
すなわち、本実施形態では、基礎構造体1の周囲に基礎スラブ7を配置することにより、基礎構造体1に対して水平方向に負荷がかかった場合にも基礎スラブ7が水平力を負担することで対応することができる。
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.

なお、本実施形態では、補強構造体形成工程において、固化材注入部3の軸中心を円中心とした円柱状に補強構造体4を形成する場合を例としたが、補強構造体4の形状等はこれに限定されない。
例えば、第2の実施形態と同様に、固化材注入部3の軸中心を円中心とした断面扇形となる柱状の補強構造体5を形成し、さらに基礎構造体1の周囲に基礎スラブ7を配置しても同様の効果を得ることができる。
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.

なお、以上本発明の実施形態について説明したが、本発明は、かかる実施形態に限定されず、その要旨を逸脱しない範囲で、種々変形が可能であることは言うまでもない。   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.

1 基礎構造体
2 既存杭体
3 固化材注入部
4 補強構造体
100 基礎補強構造
DESCRIPTION OF SYMBOLS 1 Foundation structure 2 Existing pile 3 Solidification material injection part 4 Reinforcement structure 100 Foundation reinforcement structure

Claims (4)

既設の基礎構造体を補強する基礎補強方法であって、
固化材注入部を前記基礎構造体の外側縁に沿って鉛直方向に形成する注入部形成工程と、
前記固化材注入部から固化材を注入することにより、少なくともその一部が前記基礎構造体の直下に配置されるように補強構造体を形成する補強構造体形成工程と、
を含んでいることを特徴とする基礎補強方法。
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.
前記補強構造体形成工程は、前記固化材注入部の軸中心を円中心とした円柱状に前記補強構造体を形成することを特徴とする請求項1に記載の基礎補強方法。   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. 前記補強構造体形成工程は、前記固化材注入部の軸中心を円中心とした断面扇形となる柱状に前記補強構造体を形成することを特徴とする請求項1に記載の基礎補強方法。   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. 前記基礎構造体の周囲に、前記地盤の上に載置される盤状部と、前記盤状部から垂設されて前記地盤内に埋設される杭状部と、を備える基礎スラブを配置する基礎スラブ配置工程をさらに含んでいることを特徴とする請求項1から請求項3のいずれか一項に記載の基礎補強方法。   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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JP7267890B2 (en) 2019-09-26 2023-05-02 ケミカルグラウト株式会社 Structure foundation reinforcement method

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