JP2006291607A - Foundation reinforcing method for existing structure - Google Patents

Foundation reinforcing method for existing structure Download PDF

Info

Publication number
JP2006291607A
JP2006291607A JP2005114965A JP2005114965A JP2006291607A JP 2006291607 A JP2006291607 A JP 2006291607A JP 2005114965 A JP2005114965 A JP 2005114965A JP 2005114965 A JP2005114965 A JP 2005114965A JP 2006291607 A JP2006291607 A JP 2006291607A
Authority
JP
Japan
Prior art keywords
existing
foundation
piles
pile
friction
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.)
Pending
Application number
JP2005114965A
Other languages
Japanese (ja)
Inventor
Junichi Fukushima
順一 福島
Keiji Sato
啓治 佐藤
Haruo Kobayashi
治男 小林
Kazuki Aoshima
一樹 青島
Yuji Shimonaka
裕司 下中
Hideji Matsuura
秀治 松浦
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.)
Taisei Corp
Original Assignee
Taisei Corp
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 Taisei Corp filed Critical Taisei Corp
Priority to JP2005114965A priority Critical patent/JP2006291607A/en
Publication of JP2006291607A publication Critical patent/JP2006291607A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Foundations (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple method for reinforcing earthquake resistance of an existing structure at low cost. <P>SOLUTION: In this method for providing a new row of piles around the existing structure to increase horizontal resistance strength of the existing structure, one tip supporting pile or more and one friction pile or more are driven, respectively, these piles and a foundation of the existing structure are mutually connected by a beam to increase earthquake resistance of the existing foundation, and self weight by connection of the friction pile and the beam is supported by the tip supporting pile to avoid application of load on the existing foundation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は建築物の基礎杭に関するものであり、特に既存基礎の水平耐力を増加させる耐震補強方法に関する。   The present invention relates to a foundation pile for a building, and more particularly to a seismic reinforcement method for increasing the horizontal strength of an existing foundation.

近年、建築物の耐震性に関する要求は高くなり、特に旧耐震規定で設計された既存基礎に対する補強が要求されている。   In recent years, there has been a growing demand for earthquake resistance of buildings, and in particular, reinforcement of existing foundations designed under the old earthquake resistance regulations is required.

旧耐震規定で設計された構造物の基礎に関しては、現在の基準に基づいて評価すれば、杭基礎の水平耐力や水平剛性が不十分と判断される場合がある。
一方、地震により多くの杭に大きな負荷が加わったことのある基礎では、杭の塑性変形により水平方向剛性が大幅に低下して、例え杭が折損していなくても、再度の地震で杭の変形が想定以上に大きくなることも考えられる。このような状況下では、水平耐力や水平剛性を増大させる必要がある場合がある。
For foundations of structures designed under the old seismic code, it may be judged that the horizontal strength and horizontal rigidity of pile foundations are insufficient if they are evaluated based on the current standards.
On the other hand, in foundations where a large load has been applied to many piles due to the earthquake, the horizontal rigidity is greatly reduced due to plastic deformation of the piles, and even if the piles are not broken, It is also conceivable that the deformation becomes larger than expected. Under such circumstances, it may be necessary to increase the horizontal strength and the horizontal rigidity.

これらの水平耐力や水平剛性が小さいかまたは低下した既存構造物の基礎を補強するための1つの方法は、基礎下端を掘削して基礎や杭を直接補強する方法である。しかしながらこのような方法では膨大な手間とコストを要することが多い。さらに、軟らかい地盤に対しては、時間の経過と共に杭が沈下してフーチングに加わる応力が増大した状態となっている場合があり、これには基礎の補強時に大きな障害になる。   One method for reinforcing the foundations of existing structures with low or reduced horizontal strength and horizontal rigidity is a method of directly reinforcing the foundations and piles by excavating the bottom ends of the foundations. However, such a method often requires enormous labor and cost. Furthermore, for soft ground, the pile may sink with time and the stress applied to the footing may increase, which is a major obstacle when reinforcing the foundation.

よって既存基礎の耐震補強を、経済的に行うことが要求されている。   Therefore, it is required to perform seismic reinforcement of existing foundations economically.

上記問題に鑑みて、本発明は既存構造物の周辺に新たに杭列を設けることにより、基礎下端の掘削など膨大な手間やコストを要することなく、容易に既存構造物の基礎の水平耐力や水平剛性の向上が可能となる方法を提供する。   In view of the above problems, the present invention provides a pile row around an existing structure, so that the horizontal strength of the foundation of the existing structure can be easily increased without requiring enormous labor and cost such as excavation of the lower end of the foundation. A method capable of improving horizontal rigidity is provided.

このために、本発明は、既存基礎の耐震補強方法であって、先端支持杭と摩擦杭をそれぞれ1つ以上打ち込み、これらの杭と既存構造物の基礎を梁で接続して既存基礎の耐震性を増大させると共に、先端支持杭で摩擦杭と梁との接続による自重を支持することにより既存基礎に負荷が加わることを回避する既存構造物の耐震補強方法を提案する。   To this end, the present invention is a method for seismic reinforcement of an existing foundation, in which one or more tip support piles and friction piles are driven in, and the piles and foundations of existing structures are connected with beams to seismicize the existing foundation. We propose a seismic reinforcement method for existing structures that increases the performance and avoids the load on the existing foundation by supporting the dead weight by connecting the friction pile and the beam with the tip support pile.

さらに先端支持杭または摩擦杭を、基礎に作用する地震水平力の作用点と該地震水平力に抵抗する要素の剛性中心を一致または近づけるように配置することによって、基礎に生じるねじれを低減する方法も提供する。これらによってより高い強度を得ることができる。またこれらの方法を用いた構造物も提供する。   Further, a method of reducing torsion occurring in the foundation by arranging the tip support pile or the friction pile so that the point of action of the seismic horizontal force acting on the foundation coincides with or approaches the rigid center of the element resisting the seismic horizontal force Also provide. By these, higher strength can be obtained. A structure using these methods is also provided.

本発明は既存構造物の耐震強度を低コストで増加させる方法でありこれは以下に図を用いて説明する。   The present invention is a method for increasing the seismic strength of an existing structure at a low cost, which will be described below with reference to the drawings.

図1は本発明の第1の実施例を示した断面図である。軟らかい地盤2に既存の杭6を打ち込むが、該杭6は固い岩盤5に到達している。この上に建物1が建設されている。次に基礎フーチング7は補強用の摩擦杭3が打ち込まれており、この上に設置されている。さらに補強用の先端支持杭4を硬い岩盤に到達するように打ち込む。基礎フーチングをこれにも接続させる。これによって摩擦杭と梁の接続構造による自重による基礎フーチングへの応力を大きく低減することができる。   FIG. 1 is a cross-sectional view showing a first embodiment of the present invention. The existing pile 6 is driven into the soft ground 2, and the pile 6 reaches the hard rock 5. Building 1 is built on top of this. Next, the reinforcing foot 3 is driven into the foundation footing 7 and is installed thereon. Further, the tip support pile 4 for reinforcement is driven so as to reach the hard rock. Connect the basic footing to this as well. As a result, the stress on the foundation footing due to its own weight due to the connection structure between the friction pile and the beam can be greatly reduced.

図2は第1の実施例の上面図である。既存杭6の周辺に新しく杭を打ち込むが、摩擦杭3と先端支持杭4は互いに隣接するように格子状に配置されている。このようにすることで建物の基礎にかかる力を分散させることができる。また図示したように梁8と結合させることで杭、梁、および基礎フーチングからなる門型ラーメン構造とすることができ、単列の場合と比べて既存基礎にかかる応力を大きく低減することができる。   FIG. 2 is a top view of the first embodiment. A new pile is driven around the existing pile 6. The friction pile 3 and the tip support pile 4 are arranged in a grid so as to be adjacent to each other. In this way, the force applied to the foundation of the building can be dispersed. Also, as shown in the figure, by connecting to the beam 8, a portal ramen structure composed of a pile, a beam, and a foundation footing can be obtained, and the stress applied to the existing foundation can be greatly reduced as compared with the case of a single row. .

図3、4に示されている本実施例は、新設の杭を分散させて配置する方法を示した図である。図3では摩擦杭3が建物の左側では1本であるが、右側には2本打ち込まれている。これの上面図が図4である。図4の領域14では新設の杭を分散させ、領域9では集中的に配置している。これによって既存杭のみでの剛心位置10が新設杭の設置による剛心位置11へ移動し、これは基礎の重心位置へ近づくこととなる。これによって基礎に作用する地震水平力の作用点、つまり基礎の重心と該地震水平力に抵抗する要素の剛性中心を一致または近づけることができ、地震時の基礎のねじれを低減させることができる。   The present Example shown by FIG. 3, 4 is the figure which showed the method of disperse | distributing and arranging a new pile. In FIG. 3, the number of friction piles 3 is one on the left side of the building, but two on the right side. The top view of this is FIG. In the area 14 of FIG. 4, new piles are dispersed, and the area 9 is intensively arranged. Thereby, the rigid center position 10 only in the existing pile moves to the rigid center position 11 by the installation of the new pile, which approaches the center of gravity position of the foundation. As a result, the point of action of the seismic horizontal force acting on the foundation, that is, the center of gravity of the foundation and the stiffness center of the element resisting the seismic horizontal force can be matched or brought closer, and the torsion of the foundation during an earthquake can be reduced.

本実施例では摩擦杭3を不均等に配置しているが、先端支持杭を不均等に配置することもできる。また長い杭は均等に配置し、摩擦杭を不均等に配置することもできる。   In this embodiment, the friction piles 3 are arranged unevenly, but the tip support piles can be arranged unevenly. Long piles can be placed evenly and friction piles can be placed unevenly.

図1は本発明の第1の実施例の断面図である。FIG. 1 is a cross-sectional view of a first embodiment of the present invention. 図2は本発明の第1の実施例の上面図である。FIG. 2 is a top view of the first embodiment of the present invention. 図3は本発明の第2の実施例の断面図である。FIG. 3 is a cross-sectional view of a second embodiment of the present invention. 図4は本発明の第2の実施例の上面図である。FIG. 4 is a top view of the second embodiment of the present invention.

符号の説明Explanation of symbols

1 既存構造物
2 軟らかい地盤
3 摩擦杭
4 先端支持杭
5 固い岩盤
6 既存杭
7 基礎フーチング
8 梁
9 杭の密な領域
10 既存杭のみでの剛心位置
11 新設杭による剛心位置
13 既存構造物重心位置
14 杭を分散させた領域
DESCRIPTION OF SYMBOLS 1 Existing structure 2 Soft ground 3 Friction pile 4 Tip support pile 5 Hard bed 6 Existing pile 7 Foundation footing 8 Beam 9 Pile dense area 10 Rigid position only with existing pile 11 Rigid position with new pile 13 Existing structure Center of gravity position 14 Area where piles are dispersed

Claims (3)

既存基礎の耐震補強方法であって、先端支持杭と摩擦杭をそれぞれ1つ以上打ち込み、これらの杭と既存構造物の基礎を梁で接続して既存基礎の耐震性を増大させると共に、先端支持杭で摩擦杭と梁との接続による自重を支持することにより既存基礎に負荷が加わることを回避する既存構造物の耐震補強方法。   It is a seismic strengthening method for existing foundations. One or more tip support piles and friction piles are driven in, and these piles and existing structure foundations are connected with beams to increase the earthquake resistance of the existing foundations. A seismic reinforcement method for existing structures that avoids the load from being applied to existing foundations by supporting its own weight due to the connection between friction piles and beams. 先端支持杭または摩擦杭を、基礎に作用する地震水平力の作用点と該地震水平力に抵抗する要素の剛性中心を一致または近づけるように配置することによって、基礎に生じるねじれを低減する請求項1に記載の方法。   The tip support pile or the friction pile is arranged such that the point of action of the seismic horizontal force acting on the foundation and the stiffness center of the element resisting the seismic horizontal force are aligned or close to each other, thereby reducing torsion occurring in the foundation. The method according to 1. 既存基礎の周辺に設けられた、先端支持杭と摩擦杭をそれぞれ1つ以上と、これらの杭と既存基礎を梁で接続する接続構造とを有し、既存基礎の耐震性を増大させると共に、先端支持杭で摩擦杭と梁との接続による自重を支持することにより既存基礎への負荷を回避する既存構造物の耐震補強構造物。   With one or more tip support piles and friction piles provided around the existing foundation, and a connection structure connecting these piles and the existing foundation with beams, increasing the earthquake resistance of the existing foundation, Seismic strengthening structure of existing structure that avoids load on existing foundation by supporting its own weight due to connection of friction pile and beam with tip support pile.
JP2005114965A 2005-04-12 2005-04-12 Foundation reinforcing method for existing structure Pending JP2006291607A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005114965A JP2006291607A (en) 2005-04-12 2005-04-12 Foundation reinforcing method for existing structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005114965A JP2006291607A (en) 2005-04-12 2005-04-12 Foundation reinforcing method for existing structure

Publications (1)

Publication Number Publication Date
JP2006291607A true JP2006291607A (en) 2006-10-26

Family

ID=37412456

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005114965A Pending JP2006291607A (en) 2005-04-12 2005-04-12 Foundation reinforcing method for existing structure

Country Status (1)

Country Link
JP (1) JP2006291607A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102619232A (en) * 2012-03-12 2012-08-01 广东省建筑设计研究院 Reinforced concrete foundation capable of improving aseismic capacity
JP2013096176A (en) * 2011-11-02 2013-05-20 Sumitomo Mitsui Construction Co Ltd Reinforcement structure of existing foundation
JP2015045199A (en) * 2013-08-29 2015-03-12 鹿島建設株式会社 Reinforcement structure for existing foundation of existing structure
JP2021055347A (en) * 2019-09-30 2021-04-08 大和ハウス工業株式会社 Foundation structure and construction method therefor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63171924A (en) * 1987-01-06 1988-07-15 Taisei Corp Fortifying work for earthquake-resistant pile base structure
JPH09291533A (en) * 1996-04-26 1997-11-11 Shimizu Corp Foundation pile
JPH10311144A (en) * 1997-05-12 1998-11-24 Toda Constr Co Ltd Earthquake-resistant reinforcing method for existing building
JP2000204567A (en) * 1999-01-14 2000-07-25 Penta Ocean Constr Co Ltd Foundatton structure
JP2000320152A (en) * 1999-05-13 2000-11-21 Shimizu Corp Earthquake resistant reinforcing method and earthquake resistant reinforcing structure for existing pile foundation building

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63171924A (en) * 1987-01-06 1988-07-15 Taisei Corp Fortifying work for earthquake-resistant pile base structure
JPH09291533A (en) * 1996-04-26 1997-11-11 Shimizu Corp Foundation pile
JPH10311144A (en) * 1997-05-12 1998-11-24 Toda Constr Co Ltd Earthquake-resistant reinforcing method for existing building
JP2000204567A (en) * 1999-01-14 2000-07-25 Penta Ocean Constr Co Ltd Foundatton structure
JP2000320152A (en) * 1999-05-13 2000-11-21 Shimizu Corp Earthquake resistant reinforcing method and earthquake resistant reinforcing structure for existing pile foundation building

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013096176A (en) * 2011-11-02 2013-05-20 Sumitomo Mitsui Construction Co Ltd Reinforcement structure of existing foundation
CN102619232A (en) * 2012-03-12 2012-08-01 广东省建筑设计研究院 Reinforced concrete foundation capable of improving aseismic capacity
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
JP2015045199A (en) * 2013-08-29 2015-03-12 鹿島建設株式会社 Reinforcement structure for existing foundation of existing structure
JP2021055347A (en) * 2019-09-30 2021-04-08 大和ハウス工業株式会社 Foundation structure and construction method therefor

Similar Documents

Publication Publication Date Title
JP2009516109A (en) Temporary earth retaining device
JP2011246937A (en) Building structure using post with wall provided with earthquake control prestress
JP2006291607A (en) Foundation reinforcing method for existing structure
JP5092705B2 (en) Support structure of structure, construction method of underground structure, replacement method of foundation load
KR101139761B1 (en) Reinforcing wall for construction
KR20150070843A (en) Micro pile construction method for horizontal capacity increasing
JP5191191B2 (en) Extension construction method of extension building
JP2010047933A (en) Damping reinforcement frame
JP2008031682A (en) Aseismically supporting structure during temporary bearing of building, and aseismically supporting method during temporary bearing of building
JP2006265844A (en) Reinforcing structure of underwater foundation of existing structure and its reinforcing construction method
JP5210337B2 (en) Buildings using vertical seismic control PC structural members with seismic prestress
JP2005163432A (en) Antiseismic reinforcing frame using tension material
JP4825087B2 (en) Seismic reinforcement structure for existing buildings
KR102192782B1 (en) Seismic isolation rubber pad for micro-pile and construction method of micro-pile using the same
JP4960731B2 (en) Seismic reinforcement structure for viaduct
KR102084132B1 (en) Load turnover apparatus for decreasing vertical load acting on a foundation of existing remodeling building, and remodeling method using the same
JP3138317U (en) Building
KR101371538B1 (en) The connection structure between high-strength and large size phc pile and steel beam and top down method using it
JP5252226B2 (en) Building seismic isolation method and seismic isolation building
JP3680150B1 (en) Building foundation and its construction method
KR102084142B1 (en) Load turnover apparatus for decreasing vertical load acting on a foundation of existing remodeling building, and remodeling method using the same
JP4354381B2 (en) Extension method
JP4405226B2 (en) Foundation reinforcement method for expansion of existing structures
JP5069713B2 (en) Basic structure of buildings over railway tracks
JP4903503B2 (en) Seismic retrofit method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20071206

A977 Report on retrieval

Effective date: 20100401

Free format text: JAPANESE INTERMEDIATE CODE: A971007

A131 Notification of reasons for refusal

Effective date: 20110118

Free format text: JAPANESE INTERMEDIATE CODE: A131

A131 Notification of reasons for refusal

Effective date: 20111101

Free format text: JAPANESE INTERMEDIATE CODE: A131

A521 Written amendment

Effective date: 20111227

Free format text: JAPANESE INTERMEDIATE CODE: A523

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20120814