JPH06212616A - Method for preventing liquefaction of ground as countermeasure - Google Patents

Method for preventing liquefaction of ground as countermeasure

Info

Publication number
JPH06212616A
JPH06212616A JP788293A JP788293A JPH06212616A JP H06212616 A JPH06212616 A JP H06212616A JP 788293 A JP788293 A JP 788293A JP 788293 A JP788293 A JP 788293A JP H06212616 A JPH06212616 A JP H06212616A
Authority
JP
Japan
Prior art keywords
ground
steel sheet
piles
concrete
under
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
JP788293A
Other languages
Japanese (ja)
Other versions
JP2707939B2 (en
Inventor
Takahiko Mihara
孝彦 三原
Yukitake Sawauchi
至武 澤内
Takahiro Aoyanagi
隆浩 青柳
Kenji Kato
健治 加藤
Hisatatsu Hirano
寿辰 平野
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.)
Kajima Corp
Original Assignee
Kajima 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 Kajima Corp filed Critical Kajima Corp
Priority to JP788293A priority Critical patent/JP2707939B2/en
Publication of JPH06212616A publication Critical patent/JPH06212616A/en
Application granted granted Critical
Publication of JP2707939B2 publication Critical patent/JP2707939B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Foundations (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)

Abstract

PURPOSE:To increase the shearing resistance of the ground just under an existing structure foundation, and prevent the liquefaction by peripherally driving steel sheet-piles outside the foundation until the steel sheet-piles reach a bearing ground and peripherally driving and unifying concrete to the head sections of the steel sheet-piles. CONSTITUTION:Steel sheet-piles 1 are driven peripherally on the side outer than the outer circumferential concrete 7 of a ground tank foundation, and reinforced concrete 2 is driven to the head sections of the steel sheet-piles 1 extending over the whole circumference. The steel sheet-piles 1 are unified cylindrically and the ground just under an existing structure is wrapped, the dispersion of placing load is prevented by the constraint effect of the ring of the sheet piles, and the effective constraint pressure of the ground just under the structure is increased. The shearing resistance of the ring is displayed to horizontal force, and liquefaction is prevented by these synergistic effect. The ground just under the structure is replaced with a water permeable material such as crushed stone, and several drip holes 3 for drainage are formed previously to the concrete.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は、地震時に液状化する可
能性のある地盤の液状化対策工法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquefaction countermeasure method for ground that may liquefy during an earthquake.

【０００２】[0002]

【従来の技術】従来から、地震時に液状化する可能性の
ある地盤を枠状あるいは円筒状に取囲むと、取囲まれた
内部の地盤の液状化抵抗が、枠外部の地盤の液状化抵抗
に比較して大きくなることは定性的には知られている。2. Description of the Related Art Conventionally, when a ground or cylinder that surrounds a ground that may liquefy during an earthquake is surrounded by a frame or a cylinder, the liquefaction resistance of the ground inside is surrounded by the liquefaction resistance of the ground outside the frame. It is qualitatively known to be larger than.

【０００３】[0003]

【発明が解決しようとする課題】したがって、本発明
は、地盤の液状化対策として、より有効な枠の形状、構
造を提供することを目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a more effective frame shape and structure as a countermeasure against ground liquefaction.

【０００４】[0004]

【課題を解決するための手段】本発明は、既設構造物基
礎の外側近傍に鋼矢板を円周状に支持地盤に達するまで
打設し、次いで鋼矢板の頭部に、コンクリートを円周状
に打設してなる地盤の液状化対策工法、を要旨とするも
のである。According to the present invention, a steel sheet pile is circumferentially driven near the outer side of an existing structure foundation until it reaches a supporting ground, and then concrete is circumferentially cast on the head of the steel sheet pile. The essence is the construction method for liquefaction of the ground, which is placed in

【０００５】本発明においては、形状として、円周状に
鋼矢板を打設し、さらに、その頭部にコンクリートを打
設することによって、円周状の鋼矢板を一体化させるも
のであり、他の形状、構造の枠に比して、より有効に液
状化を防止できる。すなわち、鋼矢板は円柱状に一体化
されていて既設構造物の直下地盤を包み込んでおり、そ
のリングの拘束効果により上載荷重の分散を防止し、直
下地盤の有効拘束圧を増加させる。また、水平力に対し
てはリングの剪断抵抗を発揮し、これらの相乗効果によ
り、液状化を防止できるものと考えられる。さらに、外
部の地盤が液状化した場合でも、基礎直下のリング構造
により、構造物基礎は大きな変状、機能喪失にまでは至
らない。なお、鋼矢板頭部に打設するコンクリートは鉄
筋、鉄骨などで補強されたコンクリートが好ましく、こ
の直下の地盤を砕石などの透水性の良好な材料で置換
し、このコンクリートに、予め排水用の小孔を数箇所設
けておくのもよい。In the present invention, as a shape, a steel sheet pile is cast in a circular shape, and concrete is cast in the head portion of the steel sheet pile, whereby the circumferential steel sheet pile is integrated. Liquefaction can be prevented more effectively compared to frames of other shapes and structures. That is, the steel sheet pile is integrally formed into a cylindrical shape and encloses the base plate of the existing structure, and the restraining effect of the ring prevents the top load from being dispersed and increases the effective restraining pressure of the base plate. Further, it is considered that shear resistance of the ring is exerted against a horizontal force, and a synergistic effect of these can prevent liquefaction. Furthermore, even if the outside ground is liquefied, the structure foundation does not cause major deformation or loss of function due to the ring structure directly below the foundation. It should be noted that the concrete to be placed on the steel sheet pile head is preferably concrete reinforced with reinforcing bars, steel frames, etc., and the ground immediately below is replaced with a material with good water permeability such as crushed stone, and this concrete is previously drained. It is also good to provide several small holes.

【０００６】[0006]

【実施例】以下、図面を参照して、本発明を具体的に説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

【０００７】既設構造物として円柱状の直径約２０ｍの
地上タンクを対象とした。地上タンク基礎の外周コンク
リート７より約２ｍ外側に円周状に鋼矢板１を打設し
た。鋼矢板１の下部は支持地盤に打ち込まれている。鋼
矢板１の頭部には鉄筋コンクリート２を全円周にわたっ
て打設した。水抜き孔３は等間隔に数箇所設けた。As an existing structure, a cylindrical ground tank having a diameter of about 20 m was targeted. Steel sheet piles 1 were laid circumferentially about 2 m outside the outer peripheral concrete 7 of the aboveground tank foundation. The lower part of the steel sheet pile 1 is driven into the support ground. On the head of the steel sheet pile 1, reinforced concrete 2 was cast over the entire circumference. The water drainage holes 3 were provided at several places at equal intervals.

【０００８】[0008]

【発明の効果】本発明の工法により、既設構造物の基礎
の直下地盤の剪断抵抗が増加し、構造物に対する液状化
の被害が防止される。According to the method of the present invention, the shearing resistance of the base plate of the foundation of the existing structure is increased, and damage to the structure due to liquefaction is prevented.

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

【図１】施工完了時の斜視図である。FIG. 1 is a perspective view when construction is completed.

【図２】図１、Ａ部の拡大断面図である。FIG. 2 is an enlarged cross-sectional view of part A in FIG.

【符号の説明】[Explanation of symbols]

１・・鋼矢板、２・・コンクリート、３・・水抜き孔、
４・・地上タンク、５・・タンク側板、６・・タンク底
板、７・・外周コンクリート1 ... Steel sheet pile, 2 ... Concrete, 3 ... Water drainage hole,
4 ... Ground tank, 5 ... Tank side plate, 6 ... Tank bottom plate, 7 ... Perimeter concrete

フロントページの続き (72)発明者 加藤 健治 東京都港区元赤坂１丁目２番７号 鹿島建 設株式会社内 (72)発明者 平野 寿辰 神奈川県横浜市中区太田町４丁目51番地 鹿島建設株式会社横浜支店内(72) Inventor Kenji Kato 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Hisatsu Hirano 4-51 Ota-machi, Naka-ku, Yokohama Yokohama Branch Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 既設構造物基礎の外側近傍に鋼矢板を円
周状に支持地盤に達するまで打設し、次いで鋼矢板の頭
部に、コンクリートを円周状に打設することを特徴とす
る地盤の液状化対策工法1. A steel sheet pile is cast circumferentially near the outside of an existing structure foundation until it reaches a support ground, and then concrete is cast circumferentially on the head of the steel sheet pile. Soil ground liquefaction countermeasure construction method
JP788293A 1993-01-20 1993-01-20 Ground liquefaction countermeasures Expired - Lifetime JP2707939B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP788293A JP2707939B2 (en) 1993-01-20 1993-01-20 Ground liquefaction countermeasures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP788293A JP2707939B2 (en) 1993-01-20 1993-01-20 Ground liquefaction countermeasures

Publications (2)

Publication Number Publication Date
JPH06212616A true JPH06212616A (en) 1994-08-02
JP2707939B2 JP2707939B2 (en) 1998-02-04

Family

ID=11677985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP788293A Expired - Lifetime JP2707939B2 (en) 1993-01-20 1993-01-20 Ground liquefaction countermeasures

Country Status (1)

Country Link
JP (1) JP2707939B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008231768A (en) * 2007-03-20 2008-10-02 Kajima Corp Earthquake-tidal wave countermeasure structure of structural body
JP2009035927A (en) * 2007-08-01 2009-02-19 Shimizu Corp Method of reinforcing existing structure foundation, and reinforcing structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002167778A (en) * 2000-11-29 2002-06-11 Sumitomo Metal Ind Ltd Liquefaction measure structure of structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008231768A (en) * 2007-03-20 2008-10-02 Kajima Corp Earthquake-tidal wave countermeasure structure of structural body
JP2009035927A (en) * 2007-08-01 2009-02-19 Shimizu Corp Method of reinforcing existing structure foundation, and reinforcing structure

Also Published As

Publication number Publication date
JP2707939B2 (en) 1998-02-04

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