JP2007247317A - Earthquake-proof reinforcing structure of pile foundation structure and method of earthquake-proof reinforcement - Google Patents

Earthquake-proof reinforcing structure of pile foundation structure and method of earthquake-proof reinforcement Download PDF

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JP2007247317A
JP2007247317A JP2006074242A JP2006074242A JP2007247317A JP 2007247317 A JP2007247317 A JP 2007247317A JP 2006074242 A JP2006074242 A JP 2006074242A JP 2006074242 A JP2006074242 A JP 2006074242A JP 2007247317 A JP2007247317 A JP 2007247317A
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pile foundation
pile
earthquake
foundation
slab
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JP4780457B2 (en
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Yutaka Fujita
豊 藤田
Tadashi Tamura
正 田村
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquake-proof reinforcing structure of a pile foundation structure and a method of earthquake-proof reinforcement which can favorably improve earthquake resistance without causing any damage to the existing pile foundation, and which is excellent in execution performance. <P>SOLUTION: The earthquake-proof reinforcing structure A which is provided with an extension pile foundation 4 can improve the earthquake resistance of the pile foundation structure 1 by being integrally connected to a pile foundation 1d outside the pile foundation 1d of the pile foundation structure 1 from a plane view. The extension pile foundation 4 is composed of a reinforcing pile 3 and an extension slab 2 to which the reinforcing pile 3 is integrally connected. Then the extension pile foundation 4 is provided at a location apart from the pile foundation 1d, and is connected to the pile foundation 1d through the medium of a pin-joint member 5 which enables the extension pile foundation 4 and the pile foundation 1d to move relatively in the up-and-down direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、杭基礎構造物の杭基礎の水平耐力を高め、地震による杭基礎の破壊等を防止する杭基礎構造物の耐震補強構造及び耐震補強方法に関する。   The present invention relates to a seismic reinforcement structure and a seismic reinforcement method for a pile foundation structure that enhances the horizontal strength of the pile foundation of the pile foundation structure and prevents destruction of the pile foundation due to an earthquake.

過去に建設した例えばプラント構造物などの杭基礎構造物には、建設当時の設計用地震力が現在よりも小さな値であったため、現在の設計用地震力を入力して新たに耐震診断を行なうと、杭基礎の耐震性が充分に満足していないものがある。このため、既設杭基礎構造物に対し、杭基礎の耐震補強を施すことが必要になっている。   For pile foundation structures such as plant structures that were constructed in the past, the seismic force for design at the time of construction was smaller than the present value, so the current seismic force for design is input and a new seismic diagnosis is performed. Some pile foundations are not fully satisfied with the earthquake resistance. For this reason, it is necessary to apply seismic reinforcement of the pile foundation to the existing pile foundation structure.

この杭基礎の耐震補強には、いわゆる杭増し打ち工法と称される、基礎スラブの外周側に、先端が基礎スラブ又はその周辺地盤の底面下に到達する改良体（補強杭）を、原地盤土と固化材の撹拌・混合によって構築するとともに、基礎スラブの外周に接続し、かつ改良体の頂部に接続する外周スラブ（増設スラブ）を構築して、既設杭基礎の耐震性を向上させる手法が多用されている（例えば、特許文献１参照）。   For the seismic reinforcement of this pile foundation, an improved body (reinforcement pile) whose tip reaches the bottom of the foundation slab or its surrounding ground, called the so-called pile augmentation method, is applied to the foundation ground. A method to improve the earthquake resistance of the existing pile foundation by constructing the outer slab (additional slab) connected to the outer periphery of the foundation slab and connected to the top of the improved body while constructing by mixing and mixing soil and solidified material Is frequently used (see, for example, Patent Document 1).

また、基礎スラブ（フーチング）の側面に近接した位置からフーチングの下方地盤中の既設杭の周囲へ、所要数の補強杭を打設し、各補強杭の杭頭に鋼材などにより製作した固定具を取り付け、この固定具の基板をフーチングの側面にアンカーによって定着させた耐震補強構造も用いられている（例えば、特許文献２参照）。
特開２０００−１９９２３６号公報 特開２００１−２５４３６８号公報 In addition, the required number of reinforcing piles are driven from the position close to the side surface of the foundation slab (footing) around the existing piles in the ground below the footing, and the fixtures made of steel, etc. at the pile heads of each reinforcing pile And a seismic reinforcement structure in which the substrate of the fixture is fixed to the side surface of the footing by an anchor is also used (for example, see Patent Document 2).
JP 2000-199236 A JP 2001-254368 A

しかしながら、例えば杭基礎構造物１がプラントなどである場合には、その周囲に各種プラント設備２が隣接していたり、複雑多岐な配管が縦横無尽に配置されていることが多く、杭打ち機械を設置するスペースが確保できないなど施工的な制限を受けることがあった。また、この種の耐震補強は、プラント設備２の定期点検時などプラント停止時に施工することが多く、短期間で、かつプラント設備２の解体や改修を伴うことなく耐震補強構造３を設置し充分な効果を得るようにすることが強く求められていた。   However, when the pile foundation structure 1 is a plant or the like, for example, various plant facilities 2 are adjacent to each other, and complicated and diverse pipes are often arranged in all directions. There were cases where construction restrictions were imposed, such as inability to secure space for installation. In addition, this type of seismic reinforcement is often applied when the plant is shut down, such as during periodic inspections of the plant equipment 2, and the seismic reinforcement structure 3 is sufficiently installed in a short period of time without dismantling or repairing the plant equipment 2. There has been a strong demand to obtain a positive effect.

このため、例えば図６及び図７に示すように、平面視矩形状の既設杭基礎１ｄの基礎スラブ１ｂに対し、周辺のプラント設備１０や配管を避けるように、その２辺１ｅ、１ｆ側にのみ耐震補強構造Ｂを設置し、補強杭３に比較的強度の高いものを採用することで充分な耐震効果を得るようにしていた。しかしながら、このように耐震補強構造Ｂを設置した場合には、地震時の水平力が作用した際に、基礎スラブ１ｂの補強杭３が接続した部分が、他の部分よりも強固に支持されていることから、図８及び図９に示すように、基礎が水平方向に変位し、基礎スラブ１ｂが上下方向に捩れてしまう場合があった。そして、この基礎スラブ１ｂの捩れに伴い、特に補強杭３との接続部分に大きな曲げ応力が生じ、補強杭３と増設スラブ２からなる耐震補強構造（増設杭基礎４）Ｂを増設することによってかえって基礎スラブ１ｂの損傷を招いてしまうという問題があった。   For this reason, as shown in FIGS. 6 and 7, for the foundation slab 1b of the existing pile foundation 1d having a rectangular shape in plan view, on the two sides 1e and 1f side so as to avoid the surrounding plant equipment 10 and piping. Only the seismic reinforcement structure B was installed, and a relatively high strength was adopted for the reinforcing pile 3 so as to obtain a sufficient earthquake resistance effect. However, when the seismic reinforcement structure B is installed in this way, when the horizontal force at the time of the earthquake acts, the portion to which the reinforcement pile 3 of the foundation slab 1b is connected is supported more firmly than the other portions. Therefore, as shown in FIGS. 8 and 9, the foundation is displaced in the horizontal direction, and the foundation slab 1b may be twisted in the vertical direction. And with this twisting of the foundation slab 1b, a large bending stress is generated particularly in the connection portion with the reinforcing pile 3, and by adding an earthquake-resistant reinforcing structure (extended pile foundation 4) B composed of the reinforcing pile 3 and the additional slab 2 On the contrary, there was a problem that the foundation slab 1b was damaged.

本発明は、上記事情を鑑み、杭基礎に損傷を生じさせることなく好適に耐震性を向上させることができ、かつ施工性に優れた杭基礎構造物の耐震補強構造及び耐震補強方法を提供することを目的とする。   In view of the above circumstances, the present invention provides a seismic reinforcement structure and a seismic reinforcement method for a pile foundation structure that can suitably improve earthquake resistance without causing damage to the pile foundation and that is excellent in workability. For the purpose.

上記の目的を達するために、この発明は以下の手段を提供している。   In order to achieve the above object, the present invention provides the following means.

本発明の杭基礎構造物の耐震補強構造は、補強杭と該補強杭が一体に接続された増設スラブからなる増設杭基礎を備え、平面視で杭基礎構造物の杭基礎の外側に該杭基礎に一体に接続されて設けられることにより、前記杭基礎構造物の耐震性を向上させる耐震補強構造であって、前記増設杭基礎が、前記杭基礎と離間して設けられるとともに、前記増設杭基礎と前記杭基礎とを上下方向に相対移動可能とするピン接合部材を介して前記杭基礎に接続されていることを特徴とする。   The seismic reinforcement structure for a pile foundation structure of the present invention includes an extension pile foundation including an extension slab in which the reinforcement pile and the reinforcement pile are integrally connected, and the pile is located outside the pile foundation of the pile foundation structure in plan view. A seismic reinforcement structure that improves the seismic resistance of the pile foundation structure by being integrally connected to the foundation, wherein the extension pile foundation is provided apart from the pile foundation, and the extension pile The foundation and the pile foundation are connected to the pile foundation via a pin joint member that enables relative movement in the vertical direction.

また、本発明の杭基礎構造物の耐震補強構造においては、前記杭基礎が平面視で矩形状に形成された場合には、隣接する２辺側に設けられていることが望ましい。   Moreover, in the earthquake-proof reinforcement structure of the pile foundation structure of this invention, when the said pile foundation is formed in the rectangular shape by planar view, it is desirable to be provided in two adjacent sides.

さらに、本発明の杭基礎構造物の耐震補強構造において、前記ピン接合部材は、前記杭基礎の基礎スラブと前記増設スラブのそれぞれに固定された一対の固定部材と、該一対の固定部材に両端側がそれぞれ回動自在に支持された結合部材とを備えて構成されていることが望ましい。   Furthermore, in the seismic reinforcement structure for a pile foundation structure according to the present invention, the pin joint member includes a pair of fixing members fixed to the foundation slab and the additional slab of the pile foundation, and both ends of the pair of fixing members. It is desirable that each side includes a coupling member that is rotatably supported.

また、本発明の杭基礎構造物の耐震補強構造において、前記ピン接合部材は、鋼材または鉄筋コンクリートまたは鋼管コンクリートであることがより望ましい。   In the seismic reinforcement structure for a pile foundation structure according to the present invention, the pin joint member is more preferably a steel material, a reinforced concrete, or a steel pipe concrete.

さらに、本発明の杭基礎構造物の耐震補強方法は、補強杭と該補強杭が一体に接続された増設スラブからなる増設杭基礎を、平面視で杭基礎構造物の杭基礎の外側に該杭基礎に一体に接続して設けることにより、前記杭基礎構造物の耐震性を向上させる耐震補強方法であって、前記杭基礎と離間して前記増設杭基礎を設けるとともに、前記増設杭基礎と前記杭基礎との間にピン接合部材を介装させて、前記増設杭基礎と前記杭基礎とを上下方向に相対移動可能に一体に接続することを特徴とする。   Furthermore, the seismic reinforcement method for a pile foundation structure according to the present invention includes an additional pile foundation comprising an additional slab in which the reinforcement pile and the reinforcement pile are integrally connected to the outside of the pile foundation of the pile foundation structure in plan view. A seismic reinforcement method for improving the seismic resistance of the pile foundation structure by integrally connecting to the pile foundation, wherein the extension pile foundation is provided apart from the pile foundation, and A pin joint member is interposed between the pile foundations, and the additional pile foundation and the pile foundation are integrally connected so as to be relatively movable in the vertical direction.

本発明の杭基礎構造物の耐震補強構造及び耐震補強方法によれば、杭基礎構造物の基礎スラブと耐震補強構造の増設スラブとを、ピン接合部材を介して一体に接続する構成を採ることによって、ピン接合部材の大きさや長さを調整することで、平面視で基礎スラブの外側の任意の位置に設置した、すなわち任意の離間をもって設置した増設杭基礎（補強杭と増設スラブ）を杭基礎（基礎スラブ）に確実に接続することができる。このため、例えば杭基礎構造物がプラントなどであって、その周囲にプラント設備や複雑多岐な配管が設置されているような場合においても、これらの設備などが支障とならない場所に増設杭基礎を設置することができ、プラント設備などを解体して撤去するようなことを不要にして耐震補強を施すことが可能になる。これにより、施工的な制限を受けることなく耐震補強を施すことができ、短期間で充分な耐震補強効果を得ることが可能になる。また、耐震補強を施すためにプラントを停止したりする必要もない。   According to the seismic strengthening structure and seismic strengthening method of a pile foundation structure of the present invention, the foundation slab of the pile foundation structure and the additional slab of the seismic reinforcement structure are integrally connected via a pin joint member. By adjusting the size and length of the pin joint member, pile the additional pile foundation (reinforcement pile and expansion slab) installed at an arbitrary position outside the foundation slab in plan view, that is, with an arbitrary separation It can be securely connected to the foundation (foundation slab). For this reason, for example, even if the pile foundation structure is a plant, etc., and plant facilities and various complicated pipes are installed around it, install an additional pile foundation in a place where these facilities do not hinder. It can be installed, and it is possible to perform seismic reinforcement without the need to dismantle and remove plant equipment and the like. Thereby, it is possible to perform seismic reinforcement without being restricted in construction, and a sufficient seismic reinforcement effect can be obtained in a short period of time. Moreover, it is not necessary to stop the plant in order to apply seismic reinforcement.

また、杭基礎の隣接する２辺側に耐震補強構造を設けた場合においても、基礎スラブと増設スラブが、上下方向に相対移動可能とするピン接合部材を介して一体に接続されることにより、地震時に水平力が作用して、上下方向に捩れようとする基礎スラブに対し、この力学的な捩れをピン接合部材で吸収することができ、基礎スラブに大きな曲げ応力が生じることを防止しながら水平力を補強杭に伝達することができる。これにより、補強杭を増設することに伴って基礎スラブに大きな曲げ応力が生じ、基礎スラブが損傷するようなことがなく、確実に杭基礎構造物の耐震性を向上させることができる。   In addition, even when the seismic reinforcement structure is provided on the two adjacent sides of the pile foundation, the foundation slab and the extension slab are integrally connected via a pin joining member that can move in the vertical direction. For a foundation slab that is torsional in the vertical direction due to horizontal force acting during an earthquake, this mechanical torsion can be absorbed by the pin joint member, while preventing a large bending stress from being generated in the foundation slab. Horizontal force can be transmitted to the reinforcing pile. Thereby, a large bending stress is generated in the foundation slab as the reinforcing piles are added, and the foundation slab is not damaged, and the earthquake resistance of the pile foundation structure can be improved reliably.

さらに、本発明の杭基礎構造物の耐震補強構造においては、ピン接合部材が、一対の固定部材と、結合部材とを備えて構成されることにより、上記の効果を確実に得ることができるとともに、その構成がシンプルで、かつ既設杭基礎への大掛かりな工事を不要とし、容易に取付けを行なうことができるため、施工性や経済性を大幅に向上させることができる。   Furthermore, in the seismic reinforcement structure of the pile foundation structure of the present invention, the pin joint member includes a pair of fixing members and a coupling member, so that the above effect can be obtained with certainty. The construction is simple, and it does not require a large-scale construction to the existing pile foundation and can be easily installed, so that the workability and the economical efficiency can be greatly improved.

また、本発明の杭基礎構造物の耐震補強構造においては、ピン接合部材が、鋼材または鉄筋コンクリートまたは鋼管コンクリートであることによって、すなわちピン接合部材が高い剛性を備えて形成されることによって、基礎スラブの曲げ応力を吸収しつつ地震時の水平力を確実に補強杭に伝達することができる。これにより、確実に杭基礎構造物の耐震性を向上させることができる。   Moreover, in the earthquake-proof reinforcement structure of the pile foundation structure of the present invention, the pin joint member is a steel material, a reinforced concrete, or a steel pipe concrete, that is, the pin joint member is formed with high rigidity. The horizontal force during an earthquake can be reliably transmitted to the reinforcing pile while absorbing the bending stress. Thereby, the earthquake resistance of a pile foundation structure can be improved reliably.

以下、図１から図５を参照し、本発明の一実施形態に係る杭基礎構造物の耐震補強構造及び耐震補強方法について説明する。本実施形態は、例えばプラント施設などの杭基礎構造物の杭基礎（基礎スラブ）に、ピン接合部材を介して増設杭基礎（補強杭、増設スラブ）を接続することにより杭基礎構造物の耐震性を向上させる耐震補強構造及び耐震補強方法に関するものである。   Hereinafter, with reference to FIGS. 1-5, the earthquake-proof reinforcement structure and the earthquake-proof reinforcement method of the pile foundation structure which concern on one Embodiment of this invention are demonstrated. In the present embodiment, for example, the pile foundation (reinforcement pile, extension slab) is connected to the pile foundation (foundation slab) of a pile foundation structure such as a plant facility by connecting the extension pile foundation (reinforcement pile, extension slab). The present invention relates to a seismic reinforcement structure and a seismic reinforcement method for improving the performance.

はじめに、本実施形態の耐震補強構造Ａによって耐震補強を施す杭基礎構造物１について説明する。本実施形態の杭基礎構造物１は、図１及び図２に示すように、例えばプラント構造物１ａを支持する矩形盤状の基礎スラブ１ｂ、及び基礎スラブ１ｂに頭部が接続されて、垂直方向下向きに地盤Ｇ内に延設された複数の杭１ｃからなる杭基礎１ｄが具備されている。また、基礎スラブ１ｂは、平面視で略矩形状に形成されており、その上面を地盤面Ｇ１と略同一水平面上に配して地盤Ｇに埋設されている。そして、この基礎スラブ１ｂ上にプラント構造物１ａが構築されている。一方、複数の杭１ｃは、確実にプラント構造物１ａ及び基礎スラブ１ｂを支持するように、平面視で基礎スラブ１ｂの縦横方向に均等に分散配置されている。また、各杭１ｃは、その下端側が地盤Ｇ内の支持層Ｇ２に定着されている。   First, the pile foundation structure 1 which performs earthquake-proof reinforcement by the earthquake-proof reinforcement structure A of this embodiment is demonstrated. As shown in FIGS. 1 and 2, the pile foundation structure 1 of the present embodiment has a head connected to, for example, a rectangular plate-like foundation slab 1 b that supports the plant structure 1 a and a foundation slab 1 b and is vertical. A pile foundation 1d composed of a plurality of piles 1c extending in the ground G downward in the direction is provided. Further, the foundation slab 1b is formed in a substantially rectangular shape in plan view, and the upper surface of the foundation slab 1b is arranged on the same horizontal plane as the ground surface G1 and is embedded in the ground G. A plant structure 1a is constructed on the basic slab 1b. On the other hand, the plurality of piles 1c are uniformly distributed in the vertical and horizontal directions of the foundation slab 1b in plan view so as to reliably support the plant structure 1a and the foundation slab 1b. Each pile 1c has its lower end fixed to a support layer G2 in the ground G.

本実施形態の耐震補強構造Ａは、増設スラブ２及び増設スラブ２に頭部が接続された複数の補強杭３からなる増設杭基礎４と、増設スラブ２と基礎スラブ１ｂを接続する複数のピン接合部材５とから構成されている。ここで、増設杭基礎４は、平面視で矩形状に形成された基礎スラブ１ｂの隣接する２辺１ｅ、１ｆのそれぞれの外側に、基礎スラブ１ｂと離間して設けられるとともに、対向する前記各辺１ｅ、１ｆと平行して延設されている。   The seismic reinforcement structure A of the present embodiment includes an extension slab 2 and an extension pile foundation 4 composed of a plurality of reinforcement piles 3 whose heads are connected to the extension slab 2, and a plurality of pins connecting the extension slab 2 and the foundation slab 1b. It is comprised from the joining member 5. FIG. Here, the extension pile foundation 4 is provided on the outer sides of the adjacent two sides 1e and 1f of the foundation slab 1b formed in a rectangular shape in plan view, spaced apart from the foundation slab 1b, and each of the opposing piles It extends in parallel with the sides 1e and 1f.

各増設スラブ２は、それぞれ平面視略矩形状の盤状に形成されており、その厚さが基礎スラブ１ｂの厚さと略同一とされ、基礎スラブ１ｂの対向する前記辺１ｅ、１ｆの長さと略同一の長さを備えて形成されている。そして、これらの増設スラブ２は、その上面を地盤面Ｇ１と略同一水平面上に配した状態で地盤Ｇに埋設されている。   Each extension slab 2 is formed in a substantially rectangular disk shape in plan view, and its thickness is substantially the same as the thickness of the foundation slab 1b, and the length of the sides 1e and 1f facing the foundation slab 1b. They are formed with substantially the same length. And these extension slabs 2 are embed | buried under the ground G in the state which has distribute | arranged the upper surface on the substantially the same horizontal surface as the ground surface G1.

複数の補強杭３は、それぞれ、例えば地盤土とセメント系固化材が混合されて略円柱状に形成されており、その頭部が増設スラブ２と接続されている。また、補強杭３は、その下端が、杭基礎１ｄの杭１ｃと同様に、地盤Ｇの支持層Ｇ２に定着されるように延設されている。さらに、補強杭３は、平面視で増設スラブ２の短手方向の幅方向略中央で、長手方向に沿って等間隔に配設されている。なお、補強杭３は、地盤土とセメント系固化材とからなるものに限らず、例えば鋼製杭や場所打ちコンクリート杭であってもよい。   Each of the plurality of reinforcing piles 3 is formed in a substantially columnar shape by mixing, for example, ground soil and cement-based solidified material, and the head thereof is connected to the additional slab 2. Moreover, the reinforcement pile 3 is extended so that the lower end may be fixed to the support layer G2 of the ground G similarly to the pile 1c of the pile foundation 1d. Furthermore, the reinforcement pile 3 is arrange | positioned at equal intervals along the longitudinal direction in the width direction approximate center of the transversal direction of the expansion slab 2 by planar view. In addition, the reinforcement pile 3 is not restricted to what consists of ground soil and a cement-type solidification material, For example, a steel pile and a cast-in-place concrete pile may be sufficient.

一方、本実施形態において、各耐震補強構造Ａには、ピン接合部材５が２つずつ設けられており、それぞれのピン接合部材５は、鋼製とされ、例えば基礎スラブ１ｂや増設スラブ２と同等もしくはこれらよりも高い剛性を備えて形成されている。また、ピン接合部材５は、図３及び図４に示すように、一対の固定部材６と、１つの結合部材７と、結合部材の両端側をそれぞれ一対の固定部材６に回動可能に支持させる一対のピン部材８とから構成されている。   On the other hand, in this embodiment, each seismic reinforcement structure A is provided with two pin joining members 5, and each pin joining member 5 is made of steel, for example, a basic slab 1 b or an extension slab 2. It is formed with the same or higher rigidity. Further, as shown in FIGS. 3 and 4, the pin joining member 5 supports a pair of fixing members 6, one coupling member 7, and both end sides of the coupling member so as to be rotatable on the pair of fixing members 6. It comprises a pair of pin members 8 to be made.

固定部材６は、例えば略矩形板状の基板６ａと、基板６ａに対し直交方向外側に突出する一対の支持部材６ｂとから構成されている。また、一対の支持部材６ｂは、それぞれ略平板状に形成され、基板６ａの略中央に所定の隙間を設けた状態で平行に、かつ対向して配設されている。また、各支持部材６ｂは、その下端が基板６ａに固着されるとともに、下端と突出方向先端の間に、突出方向に直交する一対の支持部材６ｂの対向方向に延びる貫通孔６ｃが形成されている。そして、これら一対の固定部材６は、それぞれ、基礎スラブ１ｂと増設スラブ２の対向するそれぞれの側面に、基板６ａの支持部材６ｂが設けられた一面と反対に位置する他面を面接触させた状態で固着されている。このとき、平面視で一対の固定部材６は、対向するように設けられ、かつ各支持部材６ｂの貫通孔６ｃの延設方向が水平方向を向くように設置される。なお、この固定部材６は、基板６ａが例えば図示せぬアンカーなどで基礎スラブ１ｂや増設スラブ２に固着されて設けられている。   The fixing member 6 includes, for example, a substantially rectangular plate-like substrate 6a and a pair of support members 6b protruding outward in the orthogonal direction with respect to the substrate 6a. The pair of support members 6b are each formed in a substantially flat plate shape, and are arranged in parallel and facing each other with a predetermined gap provided at a substantially center of the substrate 6a. Each support member 6b is fixed at its lower end to the substrate 6a, and a through hole 6c extending in the opposing direction of the pair of support members 6b perpendicular to the projecting direction is formed between the lower end and the projecting direction tip. Yes. Then, the pair of fixing members 6 are brought into surface contact with the opposite surfaces of the base slab 1b and the additional slab 2 on the other surface opposite to the one surface on which the support member 6b of the substrate 6a is provided. It is fixed in a state. At this time, the pair of fixing members 6 are provided so as to face each other in plan view, and are installed so that the extending direction of the through hole 6c of each support member 6b faces the horizontal direction. The fixing member 6 is provided by fixing the substrate 6a to the basic slab 1b or the additional slab 2 with an anchor (not shown), for example.

結合部材７は、鋼管７ａと、鋼管７ａの軸線方向両端に内孔を閉塞するように固着された一対の板状部材７ｂと、各板状部材７ｂにそれぞれ一端が固着され、軸線に沿って外側に突出した平板状の一対の連結部材７ｃとから構成されている。また、一対の連結部材７ｃには、それぞれ、平行する一面から他面に貫通する連結孔７ｄが形成されている。そして、この結合部材７は、一対の連結部材７ｃのそれぞれを前記一対の固定部材６の一対の支持部材６ｂの隙間に挿入し、水平方向に連通する一対の支持部材６ｂの貫通孔６ｃと連結部材７ｃの連結孔７ｄにピン部材８が挿通されて固定部材６に一体に支持されている。そして、この結合部材７は、ピン部材８の軸線Ｏ１回りに回動可能に固定部材６に支持され、これにより、杭基礎１ｄと増設杭基礎４とを上下方向に相対移動可能として、互いを一体に接続している。   The coupling member 7 has a steel pipe 7a, a pair of plate-like members 7b fixed so as to close the inner holes at both ends in the axial direction of the steel pipe 7a, and one end fixed to each plate-like member 7b, along the axis. It consists of a pair of flat plate-like connecting members 7c protruding outward. Each of the pair of connecting members 7c is formed with a connecting hole 7d penetrating from one parallel surface to the other surface. The coupling member 7 is inserted into the gap between the pair of support members 6b of the pair of fixing members 6 and connected to the through holes 6c of the pair of support members 6b communicating in the horizontal direction. The pin member 8 is inserted into the connecting hole 7d of the member 7c and is integrally supported by the fixing member 6. The coupling member 7 is supported by the fixing member 6 so as to be rotatable around the axis O1 of the pin member 8, thereby enabling the pile foundation 1d and the additional pile foundation 4 to move relative to each other in the vertical direction. Connected together.

このように構成される耐震補強構造Ａを設置する際には、はじめに、耐震補強を施す杭基礎構造物１の基礎スラブ１ｂの外側において、この杭基礎構造物１に隣接するプラント設備や配管１０が支障とならない位置を選定し、この位置に、複数の補強杭３を設置する。ついで、補強杭３の頭部を露出させつつ増設スラブ２を形成可能な大きさで地盤Ｇを掘削し、例えばこの地盤Ｇの掘削部内に型枠を設置する。そして、型枠内に鉄筋を配筋し、露出する補強杭３の頭部が強固に接続されるように型枠内にコンクリートを打設し、コンクリートの硬化とともに脱型して増設スラブ２を形成する。なお、このように増設スラブ２と補強杭３とが一体に接続された増設杭基礎４は、基礎スラブ１ｂから離間されて形成されている。ついで、増設スラブ２と基礎スラブ１ｂの間の地盤Ｇを掘削するとともに、増設スラブ２と基礎スラブ１ｂの互いに対向する側面を露出させる。   When installing the seismic reinforcement structure A configured as described above, first, plant equipment and piping 10 adjacent to the pile foundation structure 1 outside the foundation slab 1b of the pile foundation structure 1 to which the earthquake reinforcement is applied. Is selected so that it does not hinder, and a plurality of reinforcing piles 3 are installed at this position. Next, the ground G is excavated in such a size that the additional slab 2 can be formed while the head of the reinforcing pile 3 is exposed. For example, a formwork is installed in the excavation part of the ground G. Then, reinforcing bars are placed in the formwork, and concrete is placed in the formwork so that the exposed heads of the reinforcing piles 3 are firmly connected. Form. Note that the extension pile foundation 4 in which the extension slab 2 and the reinforcing pile 3 are integrally connected in this manner is formed apart from the foundation slab 1b. Next, the ground G between the extension slab 2 and the foundation slab 1b is excavated, and the opposite side surfaces of the extension slab 2 and the foundation slab 1b are exposed.

増設スラブ２と基礎スラブ１ｂの互いに対向する側面が露出した段階で、それぞれの側面に、例えばアンカー孔を穿孔しピン接合部材５の一対の固定部材６ａをアンカーで固定する。ついで、増設スラブ２と基礎スラブ１ｂの隙間に合わせて形成した結合部材７を、一対の連結部材７ｃが両支持部材６ｂの隙間にそれぞれ挿入されるように設置し、水平方向に連通する貫通孔６ｃと連結孔７ｄにピン部材８を挿通させる。これにより、結合部材７がピン部材８の軸線Ｏ１回りに回動可能に支持され、杭基礎１ｄと増設杭基礎４とが上下方向に相対移動可能に接続されて、本実施形態の耐震補強構造Ａの設置が完了する。   At the stage where the side surfaces of the additional slab 2 and the foundation slab 1b facing each other are exposed, for example, an anchor hole is drilled on each side surface, and the pair of fixing members 6a of the pin joining member 5 are fixed by the anchors. Next, a connecting member 7 formed in accordance with the gap between the additional slab 2 and the foundation slab 1b is installed so that the pair of connecting members 7c are respectively inserted into the gaps between the support members 6b, and the through-holes communicate with each other in the horizontal direction. The pin member 8 is inserted through 6c and the connecting hole 7d. Thereby, the coupling member 7 is supported so as to be rotatable around the axis O1 of the pin member 8, and the pile foundation 1d and the additional pile foundation 4 are connected so as to be movable relative to each other in the vertical direction. Installation of A is completed.

ここで、このように設置する本実施形態の耐震補強構造Ａは、杭基礎構造物１の周囲にプラント設備１０が隣接していたり、配管が縦横無尽に配置されているような場合においても、基礎スラブ１ｂから離間させて増設杭基礎４を形成し、この離間に合わせた長さを有するピン接合部材５を取付け杭基礎１ｄと増設杭基礎４が一体に接続されるため、プラント設備１０や配管を解体して撤去したり、プラント操業を停止させる必要がない。   Here, the seismic strengthening structure A of the present embodiment installed in this way is also in the case where the plant equipment 10 is adjacent to the periphery of the pile foundation structure 1 or the pipes are arranged in an endless manner. Since the extension pile foundation 4 is formed apart from the foundation slab 1b, and the pin joint member 5 having a length corresponding to the separation is attached, the pile foundation 1d and the extension pile foundation 4 are integrally connected. There is no need to dismantle and remove pipes or stop plant operations.

ついで、上記の構成からなる耐震補強構造Ａの作用及び効果について説明する。   Next, the operation and effect of the seismic reinforcement structure A having the above configuration will be described.

上記の耐震補強構造Ａでは、図５に示すように、基礎スラブ１ｂの２つの辺１ｅ、１ｆ側に増設杭基礎４を設けた場合においても、これら増設杭基礎４と杭基礎１ｄが、ピン接合部材５によって上下方向に相対移動可能に接続されている。このため、地震時に水平力が作用した際に、この水平力により捩れるように変形しようとする基礎スラブ１ｂに対し、この捩れ変形を生じさせる曲げ応力がピン接合部材５の回動によって吸収される。そして、このピン接合部材５により基礎スラブ１ｂの力学的な捩れを防止した状態で、水平力がピン接合部材５を通じて増設杭基礎４に伝達され、増設スラブ２に頭部が接続された補強杭３によって伝達した水平力が支持される。また、このとき、ピン接合部材５が、基礎スラブ１ｂや増設スラブ２よりも高剛性を有していることで、確実に補強杭３に水平力が伝達される。これにより、基礎スラブ１ｂに予想外の大きな応力が生じることがなくなるため、比較的強度の高い補強杭３を設置して、杭基礎１ｄひいては杭基礎構造物１に耐震補強を施した場合においても、基礎スラブ１ｂに大きな曲げ応力が生じてかえって基礎スラブ１ｂに損傷を与えるというおそれが解消される。   In the above-mentioned seismic reinforcement structure A, as shown in FIG. 5, even when the extension pile foundation 4 is provided on the two sides 1e and 1f of the foundation slab 1b, the extension pile foundation 4 and the pile foundation 1d are The joint members 5 are connected so as to be relatively movable in the vertical direction. For this reason, when a horizontal force is applied during an earthquake, the bending stress that causes the torsional deformation is absorbed by the rotation of the pin joint member 5 with respect to the foundation slab 1b that is to be deformed to be twisted by the horizontal force. The And in the state which prevented the dynamic twist of the foundation slab 1b by this pin joining member 5, the horizontal force is transmitted to the extension pile foundation 4 through the pin joining member 5, and the reinforcement pile by which the head was connected to the extension slab 2 The horizontal force transmitted by 3 is supported. At this time, since the pin joining member 5 has higher rigidity than the foundation slab 1 b and the extension slab 2, the horizontal force is reliably transmitted to the reinforcing pile 3. As a result, unexpectedly large stress is not generated in the foundation slab 1b. Therefore, even when the reinforcing pile 3 having relatively high strength is installed and the pile foundation 1d and thus the pile foundation structure 1 are subjected to earthquake-proof reinforcement. The fear that a large bending stress is generated in the foundation slab 1b and the foundation slab 1b is damaged is eliminated.

したがって、本実施形態の耐震補強構造Ａ及び耐震補強方法においては、杭基礎構造物１の杭基礎１ｄに、ピン接合部材５を介して増設杭基礎４が接続されることによって、地震時に水平力が作用した基礎スラブ１ｂが力学的な捩れを生じることがない。これにより、好適に耐震性の向上を図ることが可能になる。   Therefore, in the seismic strengthening structure A and the seismic strengthening method of the present embodiment, the extension pile foundation 4 is connected to the pile foundation 1d of the pile foundation structure 1 via the pin joint member 5, thereby generating a horizontal force during an earthquake. The basic slab 1b on which the is applied does not cause mechanical torsion. Thereby, it becomes possible to improve the earthquake resistance suitably.

また、ピン接合部材５の大きさ、長さを調整することによって、平面視で基礎スラブ１ｂの外側の任意の位置に増設杭基礎４を設置できるため、プラント設備１０などを解体して撤去することが不要になる。これにより、施工的な制限を受けることなく耐震補強を施すことができ、短期間で充分な耐震補強効果を得ることが可能になる。   Further, by adjusting the size and length of the pin joining member 5, the additional pile foundation 4 can be installed at an arbitrary position outside the foundation slab 1b in plan view, so that the plant equipment 10 and the like are disassembled and removed. It becomes unnecessary. Thereby, it is possible to perform seismic reinforcement without being restricted in construction, and a sufficient seismic reinforcement effect can be obtained in a short period of time.

さらに、本実施形態の耐震補強構造Ａにおいては、ピン接合部材５が、一対の固定部材６と結合部材７とピン部材８とからなるシンプルな構成であるとともに、一対の固定部材６を杭基礎１ｄと増設杭基礎４に固着し、結合部材７をピン部材８で支持するという簡易な操作で形成できるため、既設の杭１ｃや基礎スラブ１ｂへの工事をほぼ不要とし既往のプラントを供用している状態でも容易に施工を行なうことができる。このため、プラント停止に伴う莫大な損失を解消でき、施工性及び経済性を大幅に向上させることができる。   Furthermore, in the earthquake-proof reinforcement structure A of the present embodiment, the pin joining member 5 has a simple configuration including a pair of fixing members 6, a coupling member 7, and a pin member 8, and the pair of fixing members 6 is a pile foundation. Since it can be formed by a simple operation of adhering to 1d and the additional pile foundation 4 and supporting the connecting member 7 with the pin member 8, almost no work on the existing pile 1c and foundation slab 1b is required, and the existing plant is used. Construction can be performed easily even when the machine is on. For this reason, the huge loss accompanying a plant stop can be eliminated, and workability | operativity and economical efficiency can be improved significantly.

以上、本発明に係る耐震補強構造Ａ及び耐震補強方法の実施形態について説明したが、本発明は上記の一実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。例えば、本実施形態では、耐震補強構造Ａが、平面視で矩形状を呈する基礎スラブ１ｂの２辺１ｅ、１ｆ側にそれぞれ設けられるものとしたが、満足する耐震性の向上を図ることができ、かつ地震時に基礎スラブ１ｂに作用しようとする応力を吸収できるように設置されれば、特にその設置位置が限定される必要はない。このため、本発明の耐震補強構造Ａは、例えば基礎スラブ１ｂが平面視で円形状に形成されていたり、多角形状を呈する場合においても適用可能である。   The embodiment of the seismic reinforcement structure A and the seismic reinforcement method according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the present invention. . For example, in this embodiment, the seismic reinforcement structure A is provided on each of the two sides 1e and 1f of the foundation slab 1b having a rectangular shape in plan view. However, satisfactory seismic resistance can be improved. And if it installs so that the stress which is going to act on the foundation slab 1b at the time of an earthquake can be absorbed, the installation position does not need to be specifically limited. For this reason, the seismic reinforcement structure A of the present invention is applicable even when the foundation slab 1b is formed in a circular shape in a plan view or has a polygonal shape, for example.

また、本実施形態では、ピン接合部材５が、鋼製とされ、固定部材６と、鋼管７ａを備える結合部材７と、ピン部材８とから構成されているものとしたが、ピン接合部材５は、例えば、コンクリートや、鋼管コンクリートなどで形成されてもよい。   In the present embodiment, the pin joining member 5 is made of steel, and includes the fixing member 6, the coupling member 7 including the steel pipe 7 a, and the pin member 8. May be formed of, for example, concrete or steel pipe concrete.

さらに、本実施形態では、杭基礎構造物１がプラントであるものとして説明を行なったが、これに限定する必要はなく、本発明の耐震補強構造Ａは、例えば鉄塔や橋梁など他の構造物の杭基礎に接続されて用いられてもよい。   Furthermore, in this embodiment, although the pile foundation structure 1 demonstrated as what is a plant, it is not necessary to limit to this, The earthquake-proof reinforcement structure A of this invention is other structures, such as a steel tower and a bridge, for example. It may be used by being connected to a pile foundation.

本発明の一実施形態に係る杭基礎構造物の耐震補強構造を示す平面図である。It is a top view which shows the earthquake-proof reinforcement structure of the pile foundation structure which concerns on one Embodiment of this invention. 本発明の一実施形態に係る杭基礎構造物の耐震補強構造を示す側断面図である。It is a sectional side view which shows the earthquake-proof reinforcement structure of the pile foundation structure which concerns on one Embodiment of this invention. 本発明の一実施形態に係る杭基礎構造物の耐震補強構造を示す拡大平面図である。It is an enlarged plan view which shows the earthquake-proof reinforcement structure of the pile foundation structure which concerns on one Embodiment of this invention. 本発明の一実施形態に係る杭基礎構造物の耐震補強構造を示す拡大側面図である。It is an enlarged side view which shows the earthquake-proof reinforcement structure of the pile foundation structure which concerns on one Embodiment of this invention. 本発明の一実施形態に係る杭基礎構造物の耐震補強構造が基礎スラブの応力を吸収した状態を示す側面図である。It is a side view which shows the state which the earthquake-proof reinforcement structure of the pile foundation structure which concerns on one Embodiment of this invention absorbed the stress of the foundation slab. 従来の耐震補強構造を示す平面図である。It is a top view which shows the conventional earthquake-proof reinforcement structure. 従来の耐震補強構造を示す側断面図である。It is a sectional side view which shows the conventional earthquake-proof reinforcement structure. 従来の耐震補強構造を具備した杭基礎構造物の変形状態を示す平面図である。It is a top view which shows the deformation | transformation state of the pile foundation structure equipped with the conventional earthquake-proof reinforcement structure. 従来の耐震補強構造を具備した杭基礎構造物の変形状態を示す側断面図である。It is a sectional side view which shows the deformation | transformation state of the pile foundation structure which comprised the conventional earthquake-proof reinforcement structure.

符号の説明Explanation of symbols

１ 杭基礎構造物
１ａ プラント構造物
１ｂ 基礎スラブ
１ｃ 杭
１ｄ 杭基礎
１ｅ 辺
１ｆ 辺
２ 増設スラブ
３ 補強杭
４ 増設杭基礎
５ ピン接合部材
６ 固定部材
７ 結合部材
８ ピン部材
Ａ 耐震補強構造
Ｂ 耐震補強構造
Ｏ１ ピン部材の軸線

DESCRIPTION OF SYMBOLS 1 Pile foundation structure 1a Plant structure 1b Foundation slab 1c Pile 1d Pile foundation 1e Side 1f Side 2 Expansion slab 3 Reinforcement pile 4 Extension pile foundation 5 Pin joint member 6 Fixing member 7 Joining member 8 Pin member A Seismic reinforcement structure B Earthquake resistance Reinforcement structure O1 Pin member axis

Claims (5)

補強杭と該補強杭が一体に接続された増設スラブからなる増設杭基礎を備え、平面視で杭基礎構造物の杭基礎の外側に該杭基礎に一体に接続されて設けられることにより、前記杭基礎構造物の耐震性を向上させる耐震補強構造であって、
前記増設杭基礎が、前記杭基礎と離間して設けられるとともに、前記増設杭基礎と前記杭基礎とを上下方向に相対移動可能とするピン接合部材を介して前記杭基礎に接続されていることを特徴とする杭基礎構造物の耐震補強構造。 By providing an additional pile foundation composed of a reinforcing pile and an additional slab in which the reinforcing pile is integrally connected, and provided integrally connected to the pile foundation outside the pile foundation of the pile foundation structure in plan view, A seismic reinforcement structure that improves the earthquake resistance of pile foundation structures,
The extension pile foundation is provided apart from the pile foundation and connected to the pile foundation via a pin joint member that allows the extension pile foundation and the pile foundation to move relative to each other in the vertical direction. Seismic reinforcement structure for pile foundation structures characterized by 請求項１記載の杭基礎構造物の耐震補強構造において、
前記杭基礎が平面視で矩形状に形成され、隣接する２辺側に設けられていることを特徴とする杭基礎構造物の耐震補強構造。 In the seismic reinforcement structure of the pile foundation structure according to claim 1,
The said pile foundation is formed in the rectangular shape by planar view, and is provided in the adjacent 2 sides, The earthquake-proof reinforcement structure of the pile foundation structure characterized by the above-mentioned. 請求項１または請求項２に記載の杭基礎構造物の耐震補強構造において、
前記ピン接合部材は、前記杭基礎の基礎スラブと前記増設スラブのそれぞれに固定された一対の固定部材と、該一対の固定部材に両端側がそれぞれ回動自在に支持された結合部材とを備えて構成されていることを特徴とする杭基礎構造物の耐震補強構造。 In the earthquake-proof reinforcement structure of the pile foundation structure according to claim 1 or claim 2,
The pin joining member includes a pair of fixing members fixed to each of the foundation slab of the pile foundation and the additional slab, and a connecting member whose both ends are rotatably supported by the pair of fixing members. Seismic reinforcement structure for pile foundation structure characterized by being constructed. 請求項１から請求項３のいずれかに記載の杭基礎構造物の耐震補強構造において、
前記ピン接合部材は、鋼材または鉄筋コンクリートまたは鋼管コンクリートであることを特徴とする杭基礎構造物の耐震補強構造。 In the earthquake-proof reinforcement structure of the pile foundation structure according to any one of claims 1 to 3,
The said pin joining member is steel materials, reinforced concrete, or steel pipe concrete, The earthquake-proof reinforcement structure of a pile foundation structure characterized by the above-mentioned. 補強杭と該補強杭が一体に接続された増設スラブからなる増設杭基礎を、平面視で杭基礎構造物の杭基礎の外側に該杭基礎に一体に接続して設けることにより、前記杭基礎構造物の耐震性を向上させる耐震補強方法であって、
前記杭基礎と離間して前記増設杭基礎を設けるとともに、前記増設杭基礎と前記杭基礎との間にピン接合部材を介装させて、前記増設杭基礎と前記杭基礎とを上下方向に相対移動可能に一体に接続することを特徴とする杭基礎構造物の耐震補強方法。

By providing an additional pile foundation composed of a reinforcing pile and an additional slab in which the reinforcing pile is integrally connected to the outer side of the pile foundation of the pile foundation structure in a plan view, the pile foundation is integrally provided. A seismic reinforcement method for improving the earthquake resistance of a structure,
The extension pile foundation is provided apart from the pile foundation, and a pin joint member is interposed between the extension pile foundation and the pile foundation, so that the extension pile foundation and the pile foundation are relative to each other in the vertical direction. A method for seismic reinforcement of pile foundation structures, which is integrally connected so as to be movable.

JP2006074242A 2006-03-17 2006-03-17 Seismic reinforcement structure for pile foundation structure and seismic reinforcement method Expired - Fee Related JP4780457B2 (en)

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Cited By (5)

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JP2011184882A (en) * 2010-03-05 2011-09-22 Toda Constr Co Ltd Construction method for seismically strengthening foundation, and force application device therefor
KR101320470B1 (en) 2011-09-07 2013-10-22 주식회사 동호 Concrete file structure having a horizontal force adjustment portion and method for adjusting horizontal force
JP2016191191A (en) * 2015-03-30 2016-11-10 株式会社熊谷組 Reinforcing structure for existing pile foundation
JP2016199923A (en) * 2015-04-10 2016-12-01 西松建設株式会社 Base isolation structure and construction method thereof
JP2017036608A (en) * 2015-08-11 2017-02-16 ジャパンパイル株式会社 Pile foundation

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CN102619232B (en) * 2012-03-12 2014-03-19 广东省建筑设计研究院 Reinforced concrete foundation capable of improving aseismic capacity

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JP2002138494A (en) * 2000-10-31 2002-05-14 Shimizu Corp Structure and demolition and construction method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011184882A (en) * 2010-03-05 2011-09-22 Toda Constr Co Ltd Construction method for seismically strengthening foundation, and force application device therefor
KR101320470B1 (en) 2011-09-07 2013-10-22 주식회사 동호 Concrete file structure having a horizontal force adjustment portion and method for adjusting horizontal force
JP2016191191A (en) * 2015-03-30 2016-11-10 株式会社熊谷組 Reinforcing structure for existing pile foundation
JP2016199923A (en) * 2015-04-10 2016-12-01 西松建設株式会社 Base isolation structure and construction method thereof
JP2017036608A (en) * 2015-08-11 2017-02-16 ジャパンパイル株式会社 Pile foundation

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