JPH0649840A - Construction method of steel pipe foundation pile for preventing liquefaction - Google Patents

Construction method of steel pipe foundation pile for preventing liquefaction

Info

Publication number
JPH0649840A
JPH0649840A JP19110691A JP19110691A JPH0649840A JP H0649840 A JPH0649840 A JP H0649840A JP 19110691 A JP19110691 A JP 19110691A JP 19110691 A JP19110691 A JP 19110691A JP H0649840 A JPH0649840 A JP H0649840A
Authority
JP
Japan
Prior art keywords
steel pipe
vertical hole
water
pile
liquefaction
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
JP19110691A
Other languages
Japanese (ja)
Inventor
Noriyuki Kawabata
規之 川端
Tsukasa Aoyanagi
司 青柳
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.)
Nikken Sekkei Ltd
Nippon Steel Corp
Original Assignee
Nikken Sekkei Ltd
Nippon Steel 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 Nikken Sekkei Ltd, Nippon Steel Corp filed Critical Nikken Sekkei Ltd
Priority to JP19110691A priority Critical patent/JPH0649840A/en
Publication of JPH0649840A publication Critical patent/JPH0649840A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the liquefaction of water-containing soft ground surely by a simple means. CONSTITUTION:A casing pipe 1 is pressed into the water-containing soft ground 2, and a vertical hole 5, which reaches the support ground 4, is drilled by a drilling machine inserted into the casing pipe 1. The base protecting concrete 6 is placed into the vertical hole 5 under the support ground 4, and thereafter, the lower part of a steel pipe pile 7, which is inserted to the vertical hole 5, is inserted to the base protecting concrete 6. The casing pipe 1 is drawn out, and a clearance between the steel pipe pile 7 and the peripheral wall of the vertical hole 5 is filled with the crushed stone to form a crushed stone pillar 8.

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、含水軟弱地盤に設置す
る液状化抑止鋼管基礎杭の施工法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a liquefaction-suppressing steel pipe foundation pile to be installed on a water-containing soft ground.

【0002】[0002]

【従来の技術】従来、含水軟弱地盤(例えば含水砂層に
設置する液状化抑止鋼管基礎杭の施工方式として、特開
昭64−10819号公報により公表されているよう
に、鋼管杭における含水軟弱地盤に配置される位置に、
土砂流入防止用ネットを張設した多数の排水孔を設け、
そのネット張設排水孔を有する鋼管杭を含水軟弱地盤に
打設する方式が知られている。
2. Description of the Related Art Conventionally, a water-containing soft ground (for example, as a construction method of a liquefaction-suppressing steel pipe foundation pile installed in a water-containing sand layer, as disclosed in Japanese Patent Laid-Open No. 64-10819), a water-containing soft ground in a steel pipe pile. To the position where
Providing a large number of drain holes with a net for preventing sediment inflow,
A method is known in which a steel pipe pile having the net-stretched drainage holes is placed on the soft ground containing water.

【0003】[0003]

【発明が解決しようとする課題】前記従来の液状化抑止
鋼管基礎杭の施工方式の場合は、鋼管杭に多数の排水孔
が設けられているので、鋼管杭の構造耐力が低下し、か
つ排水孔に張設されたネットは、使用期間の経過に伴っ
て目詰まりを起こし、また地震発生時の透水によっても
目詰まりを起こすことがあり、ネットが目詰まりを起こ
すと、軟弱地盤の液状化抑制の効力を失なうという問題
がある。本発明は前述の問題を有利に解決できる液状化
抑止鋼管基礎杭の施工法を提供することを目的とするも
のである。
In the case of the conventional liquefaction-suppressing steel pipe foundation pile construction method, since the steel pipe pile is provided with a large number of drain holes, the structural strength of the steel pipe pile is reduced and The net stretched over the hole may become clogged with the lapse of usage period, and may also be clogged due to water permeation at the time of an earthquake.When the net is clogged, the soft ground is liquefied. There is a problem of losing the effect of suppression. An object of the present invention is to provide a method for constructing a liquefaction-suppressing steel pipe foundation pile that can advantageously solve the above problems.

【0004】[0004]

【課題を解決するための手段】前述の問題を有利に解決
するために、本発明の液状化抑止鋼管基礎杭の施工法に
おいては、ケーシング管1を含水軟弱地盤2に圧入しな
がら、そのケーシング管1内に挿入した掘削機3により
支持地盤4に達する縦孔5を掘削し、次に支持地盤4に
おける縦孔5に根固めコンクリート6を打設したのち、
前記縦孔5に挿入した鋼管杭7の下部を前記根固めコン
クリート6に挿入し、次に前記ケーシング管1を引抜き
ながら、鋼管杭7と縦孔5の周壁との間に砕石を充填し
て砕石柱8を構成する。
In order to advantageously solve the above problems, in the method for constructing a liquefaction-suppressing steel pipe foundation pile of the present invention, the casing pipe 1 is pressed into the water-containing soft ground 2 while the casing is being pressed. After excavating the vertical hole 5 reaching the support ground 4 by the excavator 3 inserted in the pipe 1, and then placing the concrete 6 into the vertical hole 5 in the support ground 4,
The lower part of the steel pipe pile 7 inserted into the vertical hole 5 is inserted into the root-consolidating concrete 6, and then while the casing pipe 1 is being pulled out, crushed stones are filled between the steel pipe pile 7 and the peripheral wall of the vertical hole 5. The crushed stone pillar 8 is configured.

【0005】[0005]

【実施例】次に本発明を図示の例によって詳細に説明す
る。本発明を実施して液状化抑止鋼管基礎杭を施工する
場合は、まず図1に示すように、鋼製ケーシング管1を
含水軟弱地盤2に圧入しながら、そのケーシング管1内
に挿入した回転スクリュウ型の掘削機3により、縦孔5
を掘削して行き、その縦孔5が含水軟弱地盤2を貫通し
て支持地盤4の適当深さに達したとき、縦孔5の掘削を
停止して掘削機3を引き抜く。
The present invention will now be described in detail with reference to the examples shown in the drawings. When constructing a liquefaction-suppressing steel pipe foundation pile by carrying out the present invention, first, as shown in FIG. 1, a steel casing pipe 1 is press-fitted into a water-containing soft ground 2 while being inserted into the casing pipe 1. Vertical hole 5 by screw type excavator 3
When the vertical hole 5 penetrates the water-containing soft ground 2 and reaches an appropriate depth of the support ground 4, the vertical hole 5 is stopped and the excavator 3 is pulled out.

【0006】次に図2に示すように、支持地盤4におけ
る縦孔5に根固めコンクリート6を打設し、次いでその
根固めコンクリート6が半硬化状態になったとき、鋼管
杭7を縦孔5の中央に位置するように挿入していくと共
に、鋼管杭7の下部を前記根固めコンクリート6に挿入
し、かつ保持具11により鋼管杭7の上部をケーシング
管1の上部の中央位置に保持する。
Next, as shown in FIG. 2, when the concrete for consolidation 6 is placed in the vertical hole 5 in the support ground 4 and then the concrete for consolidation 6 is in a semi-hardened state, the steel pipe pile 7 is vertically drilled. 5, the lower part of the steel pipe pile 7 is inserted into the root-consolidating concrete 6, and the upper part of the steel pipe pile 7 is held at the central position of the upper part of the casing pipe 1 by the holder 11. To do.

【0007】次に根固めコンクリート6が硬化したの
ち、図3に示すように、ケーシング管1を引抜きなが
ら、鋼管杭7と縦孔5の周壁との間に砕石を充填して砕
石柱8を構成する。このようにして多数の液状化抑止鋼
管基礎杭を施工したのち、図4に示すように、含水軟弱
地盤2の上に砕石層9を敷設し、かつ鋼管杭7の上部を
適当な位置で切断し、次にその砕石層9の上にコンクリ
ートの基礎フーチング10を施工し、鋼管杭7の上部を
その基礎フーチング10に埋込む。
Next, after the concrete for consolidation 6 hardens, as shown in FIG. 3, while pulling out the casing pipe 1, crushed stone is filled between the steel pipe pile 7 and the peripheral wall of the vertical hole 5 to form the crushed stone column 8. Constitute. After constructing a large number of liquefaction-preventing steel pipe foundation piles in this way, as shown in FIG. 4, a crushed stone layer 9 is laid on the water-containing soft ground 2, and the upper portion of the steel pipe pile 7 is cut at an appropriate position. Then, a concrete foundation footing 10 is applied on the crushed stone layer 9, and the upper portion of the steel pipe pile 7 is embedded in the foundation footing 10.

【0008】前述のようにして液状化抑止鋼管基礎杭を
施工した場合、地震発生により含水軟弱地盤2が液状化
しようとしたときは、その含水軟弱地盤2の水分が砕石
柱8を通って上昇排出されて、含水軟弱地盤2の液状化
が抑止されるので、含水軟弱地盤2の液状化による鋼管
杭7の支持力の低下が防止される。
When the liquefaction-suppressing steel pipe foundation pile is constructed as described above, when the hydrous soft ground 2 is about to liquefy due to an earthquake, the water content of the hydrous soft ground 2 rises through the crushed stone columns 8. Since the water is discharged and liquefaction of the water-containing soft ground 2 is suppressed, a decrease in the bearing capacity of the steel pipe pile 7 due to the liquefaction of the water-containing soft ground 2 is prevented.

【0009】[0009]

【発明の効果】本発明は前述のように構成されているの
で、以下に記載するような効果を奏する。地震発生によ
り含水軟弱地盤2が液状化しようとした場合は、含水軟
弱地盤2の水分が、砕石柱8の全周からその砕石柱8内
に侵入して上昇排出されるので、含水軟弱地盤2の液状
化を確実に防止することができ、そのため地震時の安全
性を向上させることができ、かつ砕石柱8の全周から吸
水できるので、従来の排水孔に張設されたネットのよう
に目詰まりを起こすことなく、長期間にわたって含水軟
弱地盤2の液状化を抑制することができ、さらに前記従
来の場合のように、鋼管杭に多数の排水孔を設けたり、
その鋼管杭に排水孔を塞ぐネットを張設する等の必要が
ないので、鋼管杭7の強度が低下することはなく、しか
も、液状化抑止鋼管基礎杭を低コストで施工することが
できる。
Since the present invention is constructed as described above, it has the following effects. When the hydrous soft ground 2 is about to be liquefied due to an earthquake, the water content of the hydrous soft ground 2 enters the crushed stone pillar 8 from the entire circumference of the crushed stone pillar 8 and ascends and discharges. Liquefaction can be surely prevented, and therefore safety at the time of an earthquake can be improved, and water can be absorbed from the entire circumference of the crushed stone column 8, so that it can be used like a net stretched over a conventional drainage hole. It is possible to suppress liquefaction of the water-containing soft ground 2 for a long period of time without causing clogging, and, as in the case of the above-mentioned conventional case, to provide a large number of drain holes in the steel pipe pile,
Since it is not necessary to extend a net for closing the drainage holes in the steel pipe pile, the strength of the steel pipe pile 7 does not decrease, and the liquefaction-preventing steel pipe foundation pile can be constructed at low cost.

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

【図1】含水軟弱地盤にケーシング管を圧入して掘削機
により縦孔を掘削した状態を示す縦断側面図である。
FIG. 1 is a vertical cross-sectional side view showing a state in which a casing pipe is press-fitted into water-containing soft ground and a vertical hole is excavated by an excavator.

【図2】支持地盤の縦孔に根固めコンクリーを充填して
鋼管杭を建て込んだ状態を示す縦断側面図である。
FIG. 2 is a vertical cross-sectional side view showing a state in which a steel pipe pile is built by filling a vertical hole of a supporting ground with a rooting concret.

【図3】ケーシング管を引抜きながら鋼管杭と縦孔の周
壁との間に砕石を充填している状態を示す縦断側面図で
ある。
FIG. 3 is a vertical cross-sectional side view showing a state in which crushed stones are filled between the steel pipe pile and the peripheral wall of the vertical hole while pulling out the casing pipe.

【図4】完成した液状化抑止鋼管基礎杭の上部に基礎フ
ーチングを施工した状態を示す縦断側面図である。
FIG. 4 is a vertical cross-sectional side view showing a state in which a foundation footing is installed on an upper portion of the completed liquefaction-suppressing steel pipe foundation pile.

【符号の説明】[Explanation of symbols]

1 ケーシング管 2 含水軟弱地盤 3 掘削機 4 支持地盤 5 縦孔 6 根固めコンクリート 7 鋼管杭 8 砕石柱 9 砕石層 10 基礎フーチング 1 Casing pipe 2 Water-containing soft ground 3 Excavator 4 Supporting ground 5 Vertical hole 6 Rooted concrete 7 Steel pipe pile 8 Crushed stone pillar 9 Crushed stone layer 10 Foundation footing

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ケーシング管1を含水軟弱地盤2に圧入
しながら、そのケーシング管1内に挿入した掘削機3に
より支持地盤4に達する縦孔5を掘削し、次に支持地盤
4における縦孔5に根固めコンクリート6を打設したの
ち、前記縦孔5に挿入した鋼管杭7の下部を前記根固め
コンクリート6に挿入し、次に前記ケーシング管1を引
抜きながら、鋼管杭7と縦孔5の周壁との間に砕石を充
填して砕石柱8を構成する液状化抑止鋼管基礎杭の施工
法。
1. A vertical hole 5 reaching a supporting ground 4 is excavated by an excavator 3 inserted into the casing pipe 1 while press-fitting a casing pipe 1 into a water-containing soft ground 2, and then a vertical hole in the supporting ground 4. 5, the bottom portion of the steel pipe pile 7 inserted into the vertical hole 5 is inserted into the root consolidation concrete 6, and then the casing pipe 1 is pulled out, while the steel pipe pile 7 and the vertical hole are formed. A method for constructing a liquefaction-suppressing steel pipe foundation pile in which crushed stone is filled between the peripheral wall of No. 5 and the crushed stone column 8.
JP19110691A 1991-07-05 1991-07-05 Construction method of steel pipe foundation pile for preventing liquefaction Pending JPH0649840A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19110691A JPH0649840A (en) 1991-07-05 1991-07-05 Construction method of steel pipe foundation pile for preventing liquefaction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19110691A JPH0649840A (en) 1991-07-05 1991-07-05 Construction method of steel pipe foundation pile for preventing liquefaction

Publications (1)

Publication Number Publication Date
JPH0649840A true JPH0649840A (en) 1994-02-22

Family

ID=16268955

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19110691A Pending JPH0649840A (en) 1991-07-05 1991-07-05 Construction method of steel pipe foundation pile for preventing liquefaction

Country Status (1)

Country Link
JP (1) JPH0649840A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4901785A (en) * 1988-07-25 1990-02-20 Hazelett Strip-Casting Corporation Twin-belt continuous caster with containment and cooling of the exiting cast product for enabling high-speed casting of molten-center product
JP2012017648A (en) * 2010-06-07 2012-01-26 Jfe Steel Corp Foundation pile group
JP2014156733A (en) * 2013-02-15 2014-08-28 Waseda Univ Construction method of permeable foundation
CN104404944A (en) * 2014-12-03 2015-03-11 中国电建集团成都勘测设计研究院有限公司 Liquefaction-prevention method for liquefiable sandy soil layer
CN106545008A (en) * 2015-09-17 2017-03-29 江苏远卓地下工程技术有限公司 A kind of cast-in-situ bored pile pile making method
JP6158398B1 (en) * 2016-06-02 2017-07-05 株式会社ガイナ Composite foundation pile
JP2020128672A (en) * 2019-02-12 2020-08-27 鹿島建設株式会社 Installation method of mono-pile foundation for offshore wind power generation and mono-pile foundation for offshore wind power generation
CN112482354A (en) * 2020-11-03 2021-03-12 广州市设计院 A precast tubular pile and soft soil foundation processing apparatus for soft soil foundation is handled
CN112482355A (en) * 2020-11-03 2021-03-12 广州市设计院 Prefabricated pipe pile, soft soil foundation treatment system and soft soil foundation treatment method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4901785A (en) * 1988-07-25 1990-02-20 Hazelett Strip-Casting Corporation Twin-belt continuous caster with containment and cooling of the exiting cast product for enabling high-speed casting of molten-center product
JP2012017648A (en) * 2010-06-07 2012-01-26 Jfe Steel Corp Foundation pile group
JP2014156733A (en) * 2013-02-15 2014-08-28 Waseda Univ Construction method of permeable foundation
CN104404944A (en) * 2014-12-03 2015-03-11 中国电建集团成都勘测设计研究院有限公司 Liquefaction-prevention method for liquefiable sandy soil layer
CN106545008A (en) * 2015-09-17 2017-03-29 江苏远卓地下工程技术有限公司 A kind of cast-in-situ bored pile pile making method
JP6158398B1 (en) * 2016-06-02 2017-07-05 株式会社ガイナ Composite foundation pile
JP2017214810A (en) * 2016-06-02 2017-12-07 株式会社ガイナ Composite foundation pile
JP2020128672A (en) * 2019-02-12 2020-08-27 鹿島建設株式会社 Installation method of mono-pile foundation for offshore wind power generation and mono-pile foundation for offshore wind power generation
CN112482354A (en) * 2020-11-03 2021-03-12 广州市设计院 A precast tubular pile and soft soil foundation processing apparatus for soft soil foundation is handled
CN112482355A (en) * 2020-11-03 2021-03-12 广州市设计院 Prefabricated pipe pile, soft soil foundation treatment system and soft soil foundation treatment method

Similar Documents

Publication Publication Date Title
US4911583A (en) Structure and method for shoring a face of an excavation
JPH0649840A (en) Construction method of steel pipe foundation pile for preventing liquefaction
CN102162258A (en) Concrete-filled steel tubular high-pile tower footing structure of tower crane and construction method thereof
CN201991013U (en) High-piled tower footing structure of tower crane concrete-filled steel tube
US4639168A (en) Hollow foundation body and method of making a foundation
JP2003147782A (en) Foundation structure for constructing new building on existing basement and its construction method
JP2002121754A (en) Method for constructing underwater foundation
JP2991092B2 (en) Liquefaction countermeasure structures and ground liquefaction countermeasures
JP2743055B2 (en) Liquefaction prevention method for sand ground
JP3530262B2 (en) Construction method of pile with water hole
JP2838324B2 (en) Shaft bottom water stoppage method
JP3075179B2 (en) Bridge pier foundation structure and its construction method
JPH0525828A (en) Final excavation level lift-preventive construction
KR100438038B1 (en) Concrete Pile Method Made of Drainage Stone Column
JP2005290871A (en) Foundation structure
CN217460602U (en) Novel foundation pit supporting structure
JP3935259B2 (en) On-site concrete pile construction method
CN216839381U (en) Plugging structure of impervious barrier
JPH10102490A (en) Method of constructing underground structure
JPH059945A (en) Underground skeleton constructing method
JP3387398B2 (en) How to penetrate caisson foundation
JP2873809B2 (en) Construction method of house with basement in soft ground
JP3794097B2 (en) Construction method for underground structures
JP2711748B2 (en) Construction method of large-scale underground space
JP2000154551A (en) Liquefaction measure device of structure just under ground and construction method therefor

Legal Events

Date Code Title Description
A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 19990615