JP4713277B2 - Pile foundation reinforcement structure - Google Patents

Pile foundation reinforcement structure Download PDF

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JP4713277B2
JP4713277B2 JP2005248752A JP2005248752A JP4713277B2 JP 4713277 B2 JP4713277 B2 JP 4713277B2 JP 2005248752 A JP2005248752 A JP 2005248752A JP 2005248752 A JP2005248752 A JP 2005248752A JP 4713277 B2 JP4713277 B2 JP 4713277B2
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reinforcing
footing
pile
ground
reinforcement
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JP2007063791A (en
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和彦 浦野
有史 足立
昭則 蓮井
勇 三反畑
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株式会社間組
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本発明は、杭基礎構造物の水平方向及び垂直方向の抵抗力を向上させるための杭基礎補強構造に関する。   The present invention relates to a pile foundation reinforcing structure for improving the horizontal and vertical resistance of a pile foundation structure.

既設の杭を補強する工法は、本出願人による特開2003−155752号公報(特許文献1)に記載されている。これは、地盤を固化改良してなる補強体を、既設杭の深さ方向地中部に設けるものである。
このように地盤を固化改良する慣用の方法としては高圧噴射工法がある。高圧噴射工法は、水、空気及びセメント等の硬化材を超高圧で地盤に噴き付けて、地山切削、硬化材混合、撹拌を行い固化改良体を造成するものであり、比較的大規模な作業になるため、施工コストが高くなるという課題がある。
また特許文献1のように、既設杭の深さ方向地中部に補強体を設けることにより、充分な水平抵抗力及び鉛直抵抗力を得ようとすると、補強体の深さ方向の長さを比較的大きなものにしなければならず、施工コストが高くなるという課題がある。
The construction method which reinforces the existing pile is described in Unexamined-Japanese-Patent No. 2003-155752 (patent document 1) by this applicant. In this method, a reinforcing body formed by solidifying and improving the ground is provided in the underground portion in the depth direction of the existing pile.
As a conventional method for solidifying and improving the ground in this way, there is a high pressure injection method. The high-pressure injection method is a method of spraying hardened materials such as water, air and cement onto the ground at ultrahigh pressure, and creating solidified improved bodies by cutting ground, mixing hardened materials, and stirring. Since it becomes work, there exists a subject that construction cost becomes high.
In addition, as in Patent Document 1, when a sufficient horizontal resistance force and vertical resistance force are obtained by providing a reinforcement body in the depth direction underground part of the existing pile, the lengths of the reinforcement bodies in the depth direction are compared. There is a problem that the construction cost becomes high.

特開2003−155752号公報JP 2003-155752 A

本発明の課題は、地中に設ける補強体の深さ方向の長さを比較的小さくすることであり、しかも、補強体が比較的小さなものであっても、充分な水平抵抗力及び鉛直抵抗力を得ることが可能な杭基礎補強構造を提供することである。   An object of the present invention is to make the length in the depth direction of the reinforcing body provided in the ground relatively small, and even if the reinforcing body is relatively small, sufficient horizontal resistance and vertical resistance are obtained. It is to provide a pile foundation reinforcement structure capable of obtaining force.

発明では、構造物を支持するためのフーチングと、該フーチングから支持層に達する複数の杭と、前記構造物から下方に離隔し、前記支持層から上方に離隔した杭の深さ方向地中部に杭相互を連結するセメントを含む固化体としての補強体と、からなる基礎構造において、前記フーチングの側方地盤に複数の増し杭を設け、該増し杭の上端はフーチングの側部、下端は前記補強体に定着したことを特徴とする杭基礎補強構造が提供される。 In the present invention, a footing for supporting the structure, a plurality of piles reaching the support layer from the footing , a depth direction underground part of the pile spaced apart from the structure and separated upward from the support layer the reinforcing member as the solidified body comprising a cement for connecting the piles each other in basic structure consisting of a plurality of increasing pile side ground of the footing, bulking and the upper end of the pile on the side of the footing, the bottom end A pile foundation reinforcing structure characterized in that is fixed to the reinforcing body is provided.

上記杭基礎補強構造では、フーチングと複数の杭とからなる基礎構造に対して、杭の深さ方向地中部に補強体を設け、この補強体とフーチングとを補強材又は増し杭で連結することにより、基礎構造全体としての剛性を高めるものである。このように基礎構造全体の剛性を高めることで、補強体の深さ方向の長さを比較的小さくすることが可能になり、その場合にも、充分な水平抵抗力及び鉛直抵抗力が得られる。   In the above-mentioned pile foundation reinforcement structure, a reinforcement body is provided in the depth direction underground part of the foundation structure composed of the footing and a plurality of piles, and the reinforcement body and the footing are connected by a reinforcing material or an additional pile. This increases the rigidity of the entire foundation structure. By increasing the rigidity of the entire foundation structure in this way, the length of the reinforcing body in the depth direction can be made relatively small, and in that case, sufficient horizontal resistance force and vertical resistance force can be obtained. .

本発明の杭基礎補強構造は、杭の深さ方向地中部に補強体のみを設けた特許文献1と比較して、補強体の大きさ、すなわち、地盤の深さ方向の長さを比較的小さくすることが可能になり、大幅なコストの低減が可能になる。また補強体を比較的小さく形成した場合にも、充分な水平抵抗力及び鉛直抵抗力を得ることが可能になった。   The pile foundation reinforcing structure of the present invention has a relatively large size of the reinforcing body, that is, the length in the depth direction of the ground, as compared with Patent Document 1 in which only the reinforcing body is provided in the depth direction underground portion of the pile. It becomes possible to make it small, and it becomes possible to significantly reduce the cost. Further, even when the reinforcing body is formed to be relatively small, it is possible to obtain a sufficient horizontal resistance force and vertical resistance force.

以下、図面を参照して本発明の実施形態について説明するが、本発明はこれに限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

図1は本発明に係る杭基礎補強構造10の断面図である。図1では、地上構造物としての橋脚11が地盤12上にフーチング13を有し、このフーチング13から支持層14に達するように複数の杭15が地盤12内に設けられている。このような杭基礎に対して、本発明に係る杭基礎補強構造10は、図1に示したように、フーチング13から離隔した杭15の深さ方向地中部に補強体16が設けられ、フーチング13の所定箇所から補強体16までロックボルト又はアンカー等の補強材17が地中に延設され、フーチング13と補強体16とが連結されている。
杭基礎補強構造10では、上述のようにフーチング13と補強体16とを複数の補強材17で連結し、基礎構造全体としての剛性を高めることにより、補強体16の深さ方向の長さLを比較的小さくするものであり、そして、この場合にも充分な水平抵抗力及び鉛直抵抗力が得られる。
FIG. 1 is a cross-sectional view of a pile foundation reinforcing structure 10 according to the present invention. In FIG. 1, the pier 11 as a ground structure has a footing 13 on the ground 12, and a plurality of piles 15 are provided in the ground 12 so as to reach the support layer 14 from the footing 13. With respect to such a pile foundation, the pile foundation reinforcement structure 10 according to the present invention is provided with a reinforcing body 16 in the depth direction underground portion of the pile 15 separated from the footing 13 as shown in FIG. A reinforcing material 17 such as a lock bolt or an anchor extends from the predetermined position 13 to the reinforcing body 16 in the ground, and the footing 13 and the reinforcing body 16 are connected.
In the pile foundation reinforcement structure 10, the footing 13 and the reinforcement body 16 are connected by the plurality of reinforcement members 17 as described above, and the rigidity L of the reinforcement body 16 is increased by increasing the rigidity of the foundation structure as a whole. In this case, sufficient horizontal resistance force and vertical resistance force can be obtained.

ここで、補強体16は複数の杭15を相互に連結するようにセメントを含む硬化材から構築されるものであり、例えば、慣用の高圧噴射工法により構築することが可能である。なお、図示はしないが、この高圧噴射工法は、水、空気及びセメント等の硬化材を超高圧で地盤に向けて噴出し得るノズルを先端に備えた管体を使用し、この管体を地上から地中所定深度まで挿入し、これにより地山切削、硬化材混合、撹拌を行い固化改良体を地中に造成するものである。高圧噴射工法により円柱状の固化改良体を地中所定深度に所定長で複数形成し、これらを地中の所定範囲内に連接することにより、補強体16を形成することが可能である。
補強体16は、フーチング13から下方に離隔し、支持層14から上方に離隔した杭15の深さ方向地中部に設けられるものであり、さらに詳細には、地震等の水平荷重に対して杭に発生する応力が最も小さくなるような位置が適宜定められる。
また補強体16の水平方向の断面形状は、図2(a)〜(c)に例示したように、幾つかの形態が可能である。図2(a)は上記高圧噴射工法により補強体16aが所定範囲全域に形成されたものであり、図2(b)では補強体16bが所定範囲の中央に原地盤18を残して形成され、図2(c)では図2(b)よりも原地盤18が更に広く残されて補強体16cが環状に形成される。
Here, the reinforcing body 16 is constructed from a hardened material containing cement so as to connect the plurality of piles 15 to each other, and can be constructed by, for example, a conventional high-pressure injection method. Although not shown in the drawings, this high-pressure injection method uses a pipe body that is provided with a nozzle at its tip that can eject a hardened material such as water, air, and cement toward the ground at an ultrahigh pressure. To a predetermined depth in the ground, and by this, ground solid cutting, hardening material mixing and stirring are carried out to create a solidified improved body in the ground. It is possible to form the reinforcing body 16 by forming a plurality of columnar solidified improvement bodies at a predetermined depth in the ground at a predetermined length by connecting them within a predetermined range in the ground by a high pressure injection method.
The reinforcing body 16 is provided in the depth direction underground part of the pile 15 spaced apart from the footing 13 and spaced upward from the support layer 14, and more specifically, piles against horizontal loads such as earthquakes. The position at which the stress generated in is the smallest is determined as appropriate.
Moreover, the cross-sectional shape of the reinforcing body 16 in the horizontal direction can take several forms as illustrated in FIGS. 2 (a) to 2 (c). FIG. 2 (a) shows that the reinforcing body 16a is formed over the entire predetermined range by the high-pressure injection method, and in FIG. 2 (b), the reinforcing body 16b is formed leaving the original ground 18 in the center of the predetermined range. In FIG. 2C, the base ground 18 is left wider than in FIG. 2B, and the reinforcing body 16c is formed in an annular shape.

次に、図3(a)(b)は、それぞれ図1におけるIII−III線に沿って見下ろした平面図であって、フーチング13に対する補強材17の相対的な配置を例示したものである。
補強材17は、フーチング13の側方地盤から補強体16まで斜めに打ち込んで、図3(a)に示したように、その上端をフーチング13の側面に固定部材19で定着することが可能である。あるいは、補強材17は、フーチング13に貫通孔を穿設し、ここから補強材17を補強体16まで斜めに打ち込んで、図3(b)に示したように、その上端をフーチング13上に固定部材19で定着することが可能である。なお、補強材17は斜め方向の設置に限定されるものではなく、例えば、図3(a)(b)の位置から鉛直下方に延ばしても良いものである。
Next, FIGS. 3A and 3B are plan views looking down along the line III-III in FIG. 1, respectively, illustrating the relative arrangement of the reinforcing material 17 with respect to the footing 13.
The reinforcing member 17 can be obliquely driven from the side ground of the footing 13 to the reinforcing body 16 and the upper end thereof can be fixed to the side surface of the footing 13 with a fixing member 19 as shown in FIG. is there. Alternatively, the reinforcing member 17 has a through-hole formed in the footing 13, and the reinforcing member 17 is obliquely driven from here to the reinforcing member 16, and the upper end thereof is placed on the footing 13 as shown in FIG. Fixing can be performed by the fixing member 19. The reinforcing member 17 is not limited to installation in an oblique direction, and may be extended vertically downward from the positions of FIGS. 3 (a) and 3 (b), for example.

図4は、図1とは異なる形態の杭基礎補強構造20の断面図である。
図4では、図1と同様な既存の杭基礎に対して、フーチング13から離隔した杭15の深さ方向地中部に補強体16が設けられ、フーチング13の外周地盤の複数箇所から補強体16まで延長する増し杭21を設け、増し杭21の上端はフーチングの側面にコンクリート22等により定着し、下端は補強体16内に埋め込んで一体化して定着している。
なお、補強体16は、図1及び図3により例示したものと同様に形成可能である。
杭基礎補強構造20では、複数の増し杭21によりフーチング13と補強体16とを連結し、基礎構造全体としての剛性を高めることにより、補強体16の深さ方向の長さLを比較的小さくすることが可能になり、この場合にも、充分な水平抵抗力及び鉛直抵抗力が得られるものである。
FIG. 4 is a cross-sectional view of a pile foundation reinforcing structure 20 having a form different from that of FIG.
In FIG. 4, a reinforcing body 16 is provided in the depth direction underground portion of the pile 15 separated from the footing 13 with respect to the existing pile foundation similar to FIG. 1, and the reinforcing body 16 is provided from a plurality of locations on the outer peripheral ground of the footing 13. An additional pile 21 extending to the top is provided, the upper end of the additional pile 21 is fixed to the side surface of the footing with concrete 22 or the like, and the lower end is embedded in the reinforcing body 16 and fixed integrally.
In addition, the reinforcement body 16 can be formed similarly to what was illustrated by FIG.1 and FIG.3.
In the pile foundation reinforcement structure 20, the footing 13 and the reinforcement body 16 are connected by a plurality of additional piles 21, and the rigidity L of the reinforcement body 16 is relatively reduced by increasing the rigidity of the foundation structure as a whole. In this case as well, sufficient horizontal resistance force and vertical resistance force can be obtained.

本発明にかかる杭基礎補強構造の断面図である。It is sectional drawing of the pile foundation reinforcement structure concerning this invention. (a)〜(c)は図1のII−II線に対応する位置の断面図である。(A)-(c) is sectional drawing of the position corresponding to the II-II line | wire of FIG. (a)(b)は図1のIII−III線に沿って見下ろした平面図である。(A) and (b) are the top views looked down along the III-III line of FIG. 図1とは異なる形態の杭基礎補強構造の断面図である。It is sectional drawing of the pile foundation reinforcement structure of a form different from FIG.

符号の説明Explanation of symbols

10 杭基礎補強構造
11 橋脚(構造物)
12 地盤
13 フーチング
15 複数の杭
16 補強体
17 補強材
20 杭基礎補強構造
21 増し杭
10 Pile foundation reinforcement structure 11 Pier (structure)
12 Ground 13 Footing 15 Plural piles 16 Reinforcement body 17 Reinforcement material 20 Pile foundation reinforcement structure 21 Additional pile

Claims (1)

構造物を支持するためのフーチングと、該フーチングから支持層に達する複数の杭と、前記構造物から下方に離隔し、前記支持層から上方に離隔した杭の深さ方向地中部に杭相互を連結するセメントを含む固化体としての補強体と、からなる基礎構造において、
前記フーチングの側方地盤に複数の増し杭を設け、該増し杭の上端はフーチングの側部に、下端は前記補強体に定着したことを特徴とする杭基礎補強構造。
A footing for supporting the structure , a plurality of piles reaching the support layer from the footing , and a pile between the piles spaced downward from the structure and spaced upward from the support layer. In the basic structure consisting of a reinforcing body as a solidified body containing cement to be connected ,
The footing a plurality of increasing pile laterally ground of bulking and the upper end side of footing piles, lower end pile foundation reinforcement structure, characterized in that the fixing to the reinforcing member.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111945586A (en) * 2020-08-18 2020-11-17 温州源铭振跃科技有限公司 Bridge pile foundation reinforcing and protecting device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016017394A (en) * 2014-07-11 2016-02-01 株式会社ドーコン Displacement suppressor and installation method for the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09316892A (en) * 1996-05-30 1997-12-09 Aruku Plan:Kk Pile foundation reinforcing structure
JPH1082057A (en) * 1996-09-09 1998-03-31 Maeda Corp Method of earthquake-resisting pile foundation construction
JP2003155752A (en) * 2002-05-30 2003-05-30 Hazama Gumi Ltd Pile footing reinforcing structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09316892A (en) * 1996-05-30 1997-12-09 Aruku Plan:Kk Pile foundation reinforcing structure
JPH1082057A (en) * 1996-09-09 1998-03-31 Maeda Corp Method of earthquake-resisting pile foundation construction
JP2003155752A (en) * 2002-05-30 2003-05-30 Hazama Gumi Ltd Pile footing reinforcing structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111945586A (en) * 2020-08-18 2020-11-17 温州源铭振跃科技有限公司 Bridge pile foundation reinforcing and protecting device

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