JP2003155752A - Pile footing reinforcing structure - Google Patents

Pile footing reinforcing structure

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Publication number
JP2003155752A
JP2003155752A JP2002157506A JP2002157506A JP2003155752A JP 2003155752 A JP2003155752 A JP 2003155752A JP 2002157506 A JP2002157506 A JP 2002157506A JP 2002157506 A JP2002157506 A JP 2002157506A JP 2003155752 A JP2003155752 A JP 2003155752A
Authority
JP
Japan
Prior art keywords
piles
reinforcing
pile
ground
reinforcement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2002157506A
Other languages
Japanese (ja)
Other versions
JP3643571B2 (en
Inventor
Makoto Kawamura
眞 河邑
Kazuhiko Urano
和彦 浦野
Yuji Adachi
有史 足立
Masaya Mihara
正哉 三原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hazama Gumi Ltd
Original Assignee
Hazama Gumi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hazama Gumi Ltd filed Critical Hazama Gumi Ltd
Priority to JP2002157506A priority Critical patent/JP3643571B2/en
Publication of JP2003155752A publication Critical patent/JP2003155752A/en
Application granted granted Critical
Publication of JP3643571B2 publication Critical patent/JP3643571B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a support pile reinforcing structure, constructed by smaller- scale execution of work as compared with the conventional footing reinforcing structure, and capable of holding down the construction cost. SOLUTION: In a plurality of piles 14 driven in the ground 12 for supporting a structure 11, a reinforcing body 20 for reducing the stress generated in case of an earthquake is provided in the middle part of the pile isolated from the structure. The reinforcing body can be formed to include the piles of the plurality of the piles that are disposed in the outer periphery and not include the pile disposed in the center, or it can be formed to surround the plurality of piles from the outer periphery and not to come into contact with the piles.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明が属する技術分野】本発明は、複数の杭において
地震等の水平荷重により発生する応力を低減するための
杭基礎補強構造に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile foundation reinforcing structure for reducing stress generated in a plurality of piles due to horizontal load such as an earthquake.

【0002】[0002]

【従来の技術】軟弱地盤上に構造物を構築するため、支
持層に達する複数の杭を地盤中に打設し、この複数の杭
により基礎構造を構成したものがある。しかしながら、
地盤が沖積砂層や細粒土が混じった砂層などからなる場
合、地震が発生すると地盤の液状化が生じることがあ
り、各杭には極めて大きな応力や変形が生じ、構造耐力
を超えると破損に至ることがある。したがって、このよ
うな軟弱地盤では、新設構造物において、フーチングの
平面を通常よりも大きくし、杭の本数を通常よりも多く
することになり、また既設構造物ではフーチングの拡
幅、増し杭等により基礎を補強することが考えられてい
るものの、大規模な施工が必要になり、施工コストも高
くなるという問題点がある。
2. Description of the Related Art In order to construct a structure on soft ground, there is a structure in which a plurality of piles reaching a support layer are driven into the ground and a foundation structure is constituted by the plurality of piles. However,
If the ground consists of alluvial sand layers or sand layers mixed with fine-grained soil, liquefaction of the ground may occur in the event of an earthquake, and extremely high stress and deformation will occur in each pile. It may reach. Therefore, in such soft ground, the footing plane will be made larger than usual and the number of piles will be made larger than usual in the new structure, and in the existing structure, the footing widening, additional piles etc. Although it is considered to reinforce the foundation, there is a problem that large-scale construction is required and the construction cost becomes high.

【0003】[0003]

【発明が解決しようとする課題】本発明は上記従来の問
題点を解決するためになされたものであり、その課題
は、上記従来の杭基礎補強構造に比べて小規模な施工で
構築可能であり、施工コストを抑制することができる杭
基礎補強構造を提供することにある。
The present invention has been made to solve the above-mentioned conventional problems, and the problem is that it can be constructed by a small-scale construction as compared with the conventional pile foundation reinforcing structure. It is to provide a pile foundation reinforcement structure that can reduce the construction cost.

【0004】[0004]

【課題を解決するための手段】本発明によれば、構造物
を支持するため地盤中に打設されている複数の杭におい
て地震時に発生する応力を低減するための補強体を、外
周に配置された杭を包含し且つ中央に配置された杭を包
含しないように、構造物から離隔した杭の中間部に設け
たことを特徴とする杭基礎補強構造が提供される。かか
る支持杭補強構造では、補強体が、複数の杭のなかで外
周に配置された杭を包含し且つ中央に配置された杭を包
含しないように形成されており、該中央に配置された杭
には補強体が直接接合していない。しかしながら、この
補強体と中央領域の各杭との間には土砂が介在してお
り、この土砂を介して補強体の拘束力は中央領域の各杭
にも伝達される。このように、複数の杭は全てが補強体
により拘束されて、複数の杭と補強体とからなる基礎構
造体は2層のラーメン構造と同様なものになる。すなわ
ち、複数の杭における杭先端から補強体部分までがラー
メン構造の一層目に相当し、補強体部分から構造物まで
がラーメン構造の2層目に相当し、これにより複数の杭
の剛性は高められ、例えば、地震などにより地盤に液状
化現象が生じても、杭と構造物の結合部で生じる最大曲
げひずみは大幅に抑制される。また上記支持杭補強構造
では、複数の杭の中央領域に補強体が無い分だけ軽量化
が図られ、複数の杭は垂直負荷が低減される。また、補
強体上下間の地下水の移動を遮断しないため、液状化時
等に発生する浮力が低減されるという効果が得られる。
According to the present invention, a reinforcing body for reducing stress generated in an earthquake in a plurality of piles driven in the ground for supporting a structure is arranged on the outer periphery. There is provided a pile foundation reinforcement structure, characterized in that it is provided in the middle part of the piles spaced from the structure so as to include the piles that are arranged and not to include the centrally arranged piles. In such a support pile reinforcing structure, the reinforcing body is formed so as to include, among a plurality of piles, a pile arranged on the outer periphery and not a pile arranged at the center, and the pile arranged at the center. The reinforcement is not directly bonded to the. However, earth and sand are present between this reinforcement and each pile in the central region, and the restraining force of the reinforcement is also transmitted to each pile in the central region via this sediment. In this way, the plurality of piles are all constrained by the reinforcing body, and the foundation structure including the plurality of piles and the reinforcing body becomes the same as the two-layered rigid frame structure. That is, from the pile tip to the reinforcement part in the plurality of piles corresponds to the first layer of the rigid frame structure, and from the reinforcement part to the structure corresponds to the second layer of the rigid frame structure, which increases the rigidity of the multiple piles. Therefore, even if a liquefaction phenomenon occurs in the ground due to, for example, an earthquake, the maximum bending strain generated at the joint between the pile and the structure is significantly suppressed. Further, in the support pile reinforcing structure, the weight of the plurality of piles is reduced due to the absence of the reinforcing body in the central region, and the vertical load of the plurality of piles is reduced. Further, since the movement of groundwater between the upper and lower sides of the reinforcing body is not blocked, the effect of reducing the buoyancy generated during liquefaction can be obtained.

【0005】また本発明によれば、構造物を支持するた
め地盤中に打設されている複数の杭において地震時に発
生する応力を低減するための補強体を、外周から複数の
杭を囲み且つ杭に接触しないように、構造物から離隔し
た杭の中間部に設けたことを特徴とする支持杭補強構造
が提供される。かかる支持杭補強構造では、杭の中間部
における外周に複数の杭を囲むように補強体が設けら
れ、複数の杭と補強体とは直接的には全く連結されてい
ないものの、複数の杭と補強体との間には土砂などが介
在しており、補強体からの拘束力は土砂などを介して間
接的に複数の杭に伝達され、複数の杭と補強体とからな
る基礎構造体が2層のラーメン構造と同様なものにな
る。すなわち、地震などにより地盤に液状化現象が生じ
ても、補強体からの拘束力は土砂などを介して複数の杭
に作用しているため、複数の杭の剛性は維持されて、曲
げひずみの抑制が可能になる。この曲げひずみの抑制効
果は、特に、杭と構造物の結合部および杭と支持層の接
点部分で有効である。
Further, according to the present invention, a reinforcing body for reducing stress generated at the time of an earthquake in a plurality of piles driven in the ground for supporting a structure is provided around the plurality of piles from the outer circumference. A support pile reinforcing structure is provided which is provided at an intermediate portion of a pile separated from a structure so as not to contact the pile. In such a support pile reinforcing structure, a reinforcing body is provided so as to surround the plurality of piles on the outer periphery in the middle portion of the pile, and although the plurality of piles and the reinforcing body are not directly connected to each other at all, Earth and sand are intervening between the reinforcement body, and the restraining force from the reinforcement body is indirectly transmitted to the plurality of piles through the earth and sand, and the foundation structure composed of the plurality of piles and the reinforcement body is formed. It is similar to a two-layered ramen structure. That is, even if a liquefaction phenomenon occurs in the ground due to an earthquake or the like, the restraining force from the reinforcing body acts on multiple piles through the earth and sand, so the rigidity of the multiple piles is maintained and the bending strain Suppression becomes possible. The effect of suppressing the bending strain is particularly effective at the joint portion between the pile and the structure and the contact portion between the pile and the support layer.

【0006】本発明において、補強体は複数の杭をまと
めて拘束し、複数の杭と構造物との接合部に生じる最大
曲げモーメントを抑制することができるように配置され
たものであれば良い。また補強体は杭の下端部から上端
部の中間部であれば、どの高さに配置しても良いもので
あるが、好ましくは地震時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高さに設けられる。
In the present invention, the reinforcing body may be arranged so as to restrain a plurality of piles collectively and suppress the maximum bending moment generated at the joint between the plurality of piles and the structure. . Further, the reinforcing body may be arranged at any height as long as it is an intermediate portion from the lower end to the upper end of the pile, but it is preferable that the stress generated in the pile against the horizontal load during an earthquake is the smallest. It is installed at such a height.

【0007】[0007]

【発明の実施の形態】以下、添付図面を参照して本発明
の好適な実施形態を説明する。図1は本発明の支持杭補
強構造を側方から見た図である。図1において、地盤1
2は沖積砂層や細粒土が混じった砂層などを含む軟弱地
盤であり、所定の深さに支持層13が存在している。構
造物11はかかる地盤12上に構築され、地盤12内に
は複数の杭14が構造物11あるいはそのフーチング
(図示せず)から支持層13に達するように打設され、
補強体20は構造物11から下方に長さH1だけ離隔
し、支持層13から上方に長さH3だけ離隔した杭14
の中間部に設けられている。補強体20は、H1,H3
が同じ長さになるように高さ方向の中央に配置すること
ができるものであるが、この高さ方向の位置は、好まし
くは地震等の水平荷重に対して杭に発生する応力が最も
小さくなるように適宜定められる。
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of the support pile reinforcing structure of the present invention. In FIG. 1, the ground 1
Reference numeral 2 is a soft ground including an alluvial sand layer, a sand layer in which fine-grained soil is mixed, and the like, and a supporting layer 13 is present at a predetermined depth. The structure 11 is constructed on the ground 12, and a plurality of piles 14 are laid in the ground 12 so as to reach the support layer 13 from the structure 11 or its footing (not shown).
The reinforcement body 20 is separated from the structure 11 downward by a length H1 and is separated from the support layer 13 upward by a length H3.
Is provided in the middle part of. Reinforcing body 20 is H1, H3
Can be placed in the center in the height direction so that they have the same length, but this position in the height direction preferably has the smallest stress generated in the pile against a horizontal load such as an earthquake. It is determined as appropriate.

【0008】図2(a)〜(c)はそれぞれ異なる形態
を示す断面図であって、これらは図1におけるA−A線
に沿った断面に相当するものである。各補強体20は図
1のように側方から見た場合には同様であるが、断面は
図2に示したように異なる形態で構成することが可能で
ある。図2(a)における補強体20Aは、複数の杭1
4のうちで外周に配置された杭14を包含し且つ中央に
配置された杭14を包含しないように形成されたもので
あり、この補強体20Aは、さらに杭14を包含しない
中央領域22Aをこれよりも小さくしても良く、例え
ば、図2(b)の補強体20Bのように、杭14を包含
する外周領域21Bを比較的大きくし、中央領域22B
を比較的小さく構成することも可能である。また図2
(c)における補強体20Cは、外周から複数の杭14
を囲み、且ついずれの杭14にも接触しないように形成
したものである。これら補強体20A,20B,20C
のうちで、水平方向の平面は補強体20Bが最も広くで
きるため強度が得やすく、したがって、縦方向の幅H2
を最も小さくできる一方で、補強体20Cは水平方向の
平面が最も狭くなってしまうため縦方向の幅H2を比較
的大きくして強度を確保する必要がある。補強体20
A,20B,20Cは、例えば、シリカコロイド系の水
ガラスなどを硬化剤として、微粒子スラグなどの主材
と、アルカリカルシウムなどの硬化促進剤とを混合し、
この混合物を地盤内に注入して土砂を固化させることに
より形成することができる。したがって、補強体20
A,20B,20Cは、新たに構築する構造物のみなら
ず、既設構造物にも適用可能なものである。なお、混合
物を地盤内に注入する工法は、慣用の技術を適用するこ
とにより実施可能であり、ここでは更なる説明を省略す
る。
2A to 2C are cross-sectional views showing different forms, which correspond to the cross section taken along the line AA in FIG. Each of the reinforcing bodies 20 is the same when viewed from the side as shown in FIG. 1, but the cross section can be configured in a different form as shown in FIG. The reinforcing body 20A in FIG.
4 is formed so as to include the pile 14 arranged on the outer circumference and not include the pile 14 arranged at the center, and the reinforcing body 20A further includes a central region 22A that does not include the pile 14. It may be smaller than this. For example, as in the reinforcing body 20B of FIG. 2B, the outer peripheral region 21B including the pile 14 is made relatively large, and the central region 22B.
It is also possible to make the size relatively small. See also FIG.
20C of reinforcement bodies in (c) are several piles 14 from the outer periphery.
And is formed so as not to contact any of the piles 14. These reinforcements 20A, 20B, 20C
Of these, the horizontal plane is the reinforcement body 20B that can be made the widest so that strength is easily obtained, and therefore the vertical width H2
On the other hand, since the horizontal plane of the reinforcing body 20C becomes the narrowest, it is necessary to make the vertical width H2 relatively large to secure the strength. Reinforcement body 20
A, 20B, and 20C are, for example, silica colloid-based water glass as a curing agent, and a main material such as fine particle slag and a curing accelerator such as alkali calcium are mixed,
It can be formed by pouring this mixture into the ground to solidify the earth and sand. Therefore, the reinforcing body 20
A, 20B, and 20C are applicable not only to a newly constructed structure but also to an existing structure. The method of injecting the mixture into the ground can be carried out by applying a conventional technique, and a further description will be omitted here.

【0009】次に、本発明の支持杭補強構造の作用につ
いて説明する。図2(a)(b)の補強体20A,20
Bは、外周領域21A,21Bに配置された杭14のみ
に接合し、中央領域22A,22Bに配置された杭14
には直接接合しないものであるが、補強体20A,20
Bの拘束力は中央領域22A,22Bに在る土砂を介し
て、これら中央領域22A,22Bの各杭14にも伝達
される。したがって、杭14の下端は支持層13により
固定され、中間部は補強体20A,20Bにより拘束さ
れ、さらに杭14の上端は構造物11に固定されるた
め、複数の杭14と補強体20A,20Bとからなる基
礎構造体は、2層ラーメン構造と同様な剛性を示すもの
になる。つまり、複数の杭14の剛性は、補強体20
A,20Bが全く無い場合に比べて格段に高まるため、
地盤内に液状化現象が生じた場合にも、構造物11や支
持層13における杭14の固定部分で生じる最大曲げひ
ずみは大幅に抑制される。また図2(c)の補強体20
Cは、複数の杭14のいずれにも直接的に連結されてい
ないものであるが、補強体20Cによる拘束力は、内部
領域22Cに在る土砂を介して各杭14に伝達されるた
め、複数の杭14は上記と同様に剛性が高められ、構造
物11や支持層13における杭14の固定部分で生じる
最大曲げひずみも抑制される。
Next, the operation of the support pile reinforcing structure of the present invention will be described. Reinforcement bodies 20A and 20 shown in FIGS.
B is joined only to the piles 14 arranged in the outer peripheral areas 21A and 21B, and the piles 14 arranged in the central areas 22A and 22B
Are not directly joined to the reinforcing members 20A, 20
The restraint force of B is also transmitted to the piles 14 in the central regions 22A and 22B through the earth and sand in the central regions 22A and 22B. Therefore, the lower end of the pile 14 is fixed by the support layer 13, the middle portion is restrained by the reinforcing bodies 20A and 20B, and the upper end of the pile 14 is fixed to the structure 11, so that the plurality of piles 14 and the reinforcing bodies 20A, 20A, The basic structure composed of 20B has the same rigidity as the two-layer rigid frame structure. That is, the rigidity of the plurality of piles 14 depends on the reinforcement body 20.
Compared to the case without A and 20B at all, it is much higher,
Even when the liquefaction phenomenon occurs in the ground, the maximum bending strain generated in the fixed portion of the pile 11 in the structure 11 and the support layer 13 is significantly suppressed. In addition, the reinforcing body 20 of FIG.
C is not directly connected to any of the plurality of piles 14, but the restraining force of the reinforcing body 20C is transmitted to each pile 14 through the earth and sand in the inner region 22C, The rigidity of the plurality of piles 14 is increased in the same manner as described above, and the maximum bending strain generated in the fixed portion of the piles 14 in the structure 11 and the support layer 13 is also suppressed.

【0010】本発明の支持杭補強構造における曲げひず
み抑制効果を検証するための実験を行ない、その結果を
図3に示した。 (実験概要)本実験は液状化時の杭基礎の挙動を把握す
るため、せん断土層を用いた1G場振動台に、本発明の
支持杭補強構造の模型を設置して実施したものである。
振動台において、せん断土層は幅1.5m×奥行0.4
m×高さ0.6mであり、地盤は珪砂5号を用いた2
層、上部層の相対密度Dr=50%、下部層の相対密度
Dr=90%からなる水平地盤を対象とした。地盤作製
は砂を均等に撒き散らすことができる砂撒き装置を使用
し、水中落下法により5cmごとに土層を作成し、所定
の相対密度を確認した。なお、間隙流水は水を使用し
た。杭の模型は外径19.1mm、肉厚1.2mm、長
さ600mmの鋼管を4本使用し、これら4本の鋼管を
2列2行の等間隔150mm(7.8D)に配置してフ
ーチングを支持した。杭の上端はフーチングに剛結、杭
下端は振動台の底版に固定した。図3に示した3ケース
は全て地盤が飽和砂で、ケースは補強を行なわないも
の、ケースは図2(c)に相当する補強を行なったも
の、ケースは図2(a)(b)に相当する補強を行な
ったものである。各ケースの入力波形は同一とした。
An experiment was conducted to verify the bending strain suppressing effect in the support pile reinforcing structure of the present invention, and the results are shown in FIG. (Experimental outline) In order to understand the behavior of the pile foundation during liquefaction, this experiment was carried out by installing the model of the support pile reinforcing structure of the present invention on a 1G field shaking table using a shear soil layer. .
On the shaking table, the shear soil layer is 1.5m wide x 0.4 depth
m × height 0.6 m, and the ground used silica sand No. 2
The horizontal ground consisting of the relative densities of the upper layer and the upper layer is 50% and the relative density of the lower layer is 90%. For the ground preparation, a sand sprinkling device that can evenly scatter sand was used, and a soil layer was created every 5 cm by the underwater drop method, and a predetermined relative density was confirmed. Water was used as the pore water. The pile model uses four steel pipes with an outer diameter of 19.1 mm, a wall thickness of 1.2 mm, and a length of 600 mm, and these four steel pipes are arranged in two columns and two rows at equal intervals of 150 mm (7.8 D). He supported footing. The top of the pile was rigidly connected to the footing, and the bottom of the pile was fixed to the bottom plate of the shaking table. In all three cases shown in FIG. 3, the ground is saturated sand, the case is not reinforced, the case is reinforced corresponding to FIG. 2 (c), and the case is shown in FIG. 2 (a) (b). It has been reinforced correspondingly. The input waveform in each case was the same.

【0011】(実験結果)図3は分布を示したものであ
る。曲げひずみの発生は、液状化の進行に伴ない増加
し、完全液状化後急激に低下した。図2(a)〜(c)
に相当する補強を行なったものは、補強を行なわないも
のと比べて最大曲げひずみは杭上下端部で4〜5割程度
減少した。またケースは、補強体20Aまたは補強体
20Bにより外周の杭中間部同士が一体に連結されてい
るので、2層ラーメン的な構造となり、複数の杭はケー
スよりも強く拘束されて剛となり、最大曲げひずみは
ケースよりも若干小さくなった。
(Experimental Results) FIG. 3 shows the distribution. The occurrence of bending strain increased with the progress of liquefaction and decreased sharply after complete liquefaction. 2 (a) to (c)
The maximum bending strain at the upper and lower ends of the pile in the case of reinforcement corresponding to the above was reduced by about 40 to 50% as compared with the case of no reinforcement. In addition, the case has a two-layer ramen-like structure because the pile middle portions of the outer circumference are integrally connected by the reinforcement body 20A or the reinforcement body 20B, and the plurality of piles are constrained more strongly than the case and become rigid. The bending strain was slightly smaller than that of the case.

【0012】[0012]

【発明の効果】本発明の支持杭補強構造は、複数の杭の
なかで外周に配置された杭を補強体が包含し且つ中央に
配置された杭を補強体が包含しないように構成されたの
で、複数の杭は補強体で連結されて剛性は高められ、液
状化現象が生じた場合にも、杭と構造物の結合部で生じ
る最大曲げひずみは大幅に抑制される。また本発明で
は、杭の中間部における外周に複数の杭を囲むように補
強体が設けられ、補強体からの拘束力が土砂などを介し
て間接的に複数の杭に伝達されるので、上記と同様に、
杭と構造物の結合部で生じる最大曲げひずみの抑制が可
能になる。さらに、本発明の支持杭補強構造では、杭の
中間部に補強体を設けるだけで以上のような最大曲げひ
ずみの抑制効果が得られるため、従来の基礎補強構造に
比べて小規模な施工で済み、施工コストを抑制すること
が可能になった。
EFFECT OF THE INVENTION The support pile reinforcing structure of the present invention is constituted so that the reinforcement body includes the piles arranged on the outer periphery among the plurality of piles and the reinforcement body does not include the pile arranged in the center. Therefore, the plurality of piles are connected by the reinforcing body to increase the rigidity, and even when the liquefaction phenomenon occurs, the maximum bending strain generated at the joint portion between the pile and the structure is significantly suppressed. Further, in the present invention, a reinforcing body is provided so as to surround the plurality of piles on the outer periphery of the middle portion of the pile, and the restraining force from the reinforcing body is indirectly transmitted to the plurality of piles through the earth and sand. alike,
It is possible to suppress the maximum bending strain generated at the joint between the pile and the structure. Further, in the supporting pile reinforcing structure of the present invention, since the effect of suppressing the maximum bending strain as described above can be obtained only by providing the reinforcing body in the middle portion of the pile, it is possible to carry out a small-scale construction as compared with the conventional foundation reinforcing structure. It has become possible to reduce the construction cost.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の支持杭補強構造を側方から見た図であ
る。
FIG. 1 is a side view of a support pile reinforcing structure of the present invention.

【図2】図1におけるA−A線に沿った断面図であっ
て、(a)〜(c)はそれぞれ異なる実施の形態を示
す。
FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, in which (a) to (c) show different embodiments.

【図3】本発明の効果を検証するために行なった実験の
結果を示すグラフである。
FIG. 3 is a graph showing the results of an experiment conducted to verify the effects of the present invention.

【符号の説明】[Explanation of symbols]

11 構造物 12 地盤 14 杭 20,20A,20B,20C 補強体 11 structures 12 ground 14 piles 20,20A, 20B, 20C Reinforcement body

フロントページの続き (72)発明者 足立 有史 東京都港区北青山2丁目5番8号 株式会 社間組内 (72)発明者 三原 正哉 東京都港区北青山2丁目5番8号 株式会 社間組内 Fターム(参考) 2D040 AB01 AC02 BD06 CA02 CA03 CA04 2D046 CA01 DA11 Continued front page    (72) Inventor Yuji Adachi             2-5-8 Kita-Aoyama, Minato-ku, Tokyo Stock market             Within the company group (72) Inventor Masaya Mihara             2-5-8 Kita-Aoyama, Minato-ku, Tokyo Stock market             Within the company group F term (reference) 2D040 AB01 AC02 BD06 CA02 CA03                       CA04                 2D046 CA01 DA11

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 構造物を支持するため地盤中に打設され
ている複数の杭において地震時に発生する応力を低減す
るための補強体を、外周に配置された杭を包含し且つ中
央に配置された杭を包含しないように、構造物から離隔
した杭の中間部に設けたことを特徴とする杭基礎補強構
造。
1. A reinforcing body for reducing stress generated during an earthquake in a plurality of piles driven in the ground to support a structure, including the piles arranged on the outer periphery and arranged in the center. A pile foundation reinforcing structure, characterized in that it is provided in the middle part of the piles separated from the structure so as not to include the piles.
【請求項2】 構造物を支持するため地盤中に打設され
ている複数の杭において地震時に発生する応力を低減す
るための補強体を、外周から複数の杭を囲み且つ杭に接
触しないように、構造物から離隔した杭の深さ方向中間
部に設けたことを特徴とする杭基礎補強構造。
2. A reinforcement body for reducing stress generated at the time of an earthquake in a plurality of piles driven in the ground to support a structure so as to surround the plurality of piles from the outer periphery and not to contact the piles. In addition, a pile foundation reinforcement structure characterized in that it is provided at an intermediate portion in the depth direction of the pile separated from the structure.
【請求項3】 前記補強体は、固化剤を地盤内に注入し
て土砂を固化させることにより形成されたものである請
求項1または2に記載の杭基礎補強構造。
3. The pile foundation reinforcing structure according to claim 1, wherein the reinforcing body is formed by pouring a solidifying agent into the ground to solidify the earth and sand.
JP2002157506A 2002-05-30 2002-05-30 Pile foundation reinforcement structure Expired - Lifetime JP3643571B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002157506A JP3643571B2 (en) 2002-05-30 2002-05-30 Pile foundation reinforcement structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002157506A JP3643571B2 (en) 2002-05-30 2002-05-30 Pile foundation reinforcement structure

Publications (2)

Publication Number Publication Date
JP2003155752A true JP2003155752A (en) 2003-05-30
JP3643571B2 JP3643571B2 (en) 2005-04-27

Family

ID=19194872

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007032065A (en) * 2005-07-26 2007-02-08 Hazama Corp Pile foundation reinforcing structure
JP2007063791A (en) * 2005-08-30 2007-03-15 Hazama Corp Pile foundation reinforcing structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007032065A (en) * 2005-07-26 2007-02-08 Hazama Corp Pile foundation reinforcing structure
JP4699831B2 (en) * 2005-07-26 2011-06-15 株式会社間組 Pile foundation reinforcement structure
JP2007063791A (en) * 2005-08-30 2007-03-15 Hazama Corp Pile foundation reinforcing structure
JP4713277B2 (en) * 2005-08-30 2011-06-29 株式会社間組 Pile foundation reinforcement structure

Also Published As

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