JPH0617414A - Drainage reinforcement pile - Google Patents

Drainage reinforcement pile

Info

Publication number
JPH0617414A
JPH0617414A JP14993292A JP14993292A JPH0617414A JP H0617414 A JPH0617414 A JP H0617414A JP 14993292 A JP14993292 A JP 14993292A JP 14993292 A JP14993292 A JP 14993292A JP H0617414 A JPH0617414 A JP H0617414A
Authority
JP
Japan
Prior art keywords
ground
deformed
bar
crushed stones
pile
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
JP14993292A
Other languages
Japanese (ja)
Other versions
JPH0713366B2 (en
Inventor
Eizo Kuroda
栄三 黒田
Kazuyuki Nakamura
和之 中村
Masahiro Okamoto
正広 岡本
Kenzo Ochi
健三 越智
Osamu Endo
修 遠藤
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.)
Minister for Public Works for State of New South Wales
Tokyu Construction Co Ltd
National Research and Development Agency Public Works Research Institute
Original Assignee
Minister for Public Works for State of New South Wales
Public Works Research Institute Ministry of Construction
Tokyu Construction Co 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 Minister for Public Works for State of New South Wales, Public Works Research Institute Ministry of Construction, Tokyu Construction Co Ltd filed Critical Minister for Public Works for State of New South Wales
Priority to JP4149932A priority Critical patent/JPH0713366B2/en
Publication of JPH0617414A publication Critical patent/JPH0617414A/en
Publication of JPH0713366B2 publication Critical patent/JPH0713366B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To prevent effectively a tension fracture produced by liquidization of sand ground bed in earthquake not only to prevent residual sink after earthquake, but also to cope effectively with the existing structures such as tank, river bank, banking, buried object, semi-underground structure, etc. CONSTITUTION:A deformed PC bar 4a with uneven surface of approx. 150mm of node for an inner diameter of 100mm is positioned in an oval hole drilled in the ground 1, and crushed stones 4b of below approx. 25mm are filled tightly around it, to construct a pile of a diameter of approx. 250mm. Because the crushed stones 4b are engaged with a sand ground 1 around it an also engaged with the deformed PC bar 4a, when a tension is applied to the ground 1, the tension is transmitted to the deformed PC bar 4a through the crushed stones 4b. As a result, the deformed PC bar 4a resists the tension of the ground 1. The compressive force of the ground 1 also receives a resistance by the deformed PC bar 4a and crushed stones 4b. Because a space exists between the crushed stones 4b, space water in the surrounding ground bed 1 is absorbed in it, rises, and collected to a water collecting reservoir 5 on the surface of the ground.

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、砂質地盤の引張破壊を
防止し、排水機能を備えた排水補強杭に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage reinforcing pile having a drainage function for preventing tensile failure of sandy ground.

【0002】[0002]

【従来の技術】従来の砂質地盤の改良工法として、サン
ドコンパクション工法、グラベルコンパクション工法、
バイブロフローテーション工法、深層混合処理工法およ
び矢板工法等があった。
2. Description of the Related Art As a conventional sandy ground improvement method, a sand compaction method, a gravel compaction method,
There were vibro flotation method, deep mixing method and sheet pile method.

【0003】しかしながら、上記グラベルコンパクショ
ン工法は排水効果のみ期待したものであり、またサンド
コンパクション工法やバイブロフローテーション工法は
砂質地盤を単に締固めるだけの効果しかなく、しかも、
鉛直方向の打設しか行なうことができなかった。
However, the gravel compaction method is expected only for the drainage effect, and the sand compaction method and the vibro flotation method have only the effect of simply compacting the sandy ground.
Only vertical placement was possible.

【0004】さらに、上記深層混合処理工法は地盤をセ
メント等の改良剤で単に固めるだけの工法でしかなく、
砂質地盤で用いると出来形不良が生じて地震時にその荷
重が出来形不良部分に集中して破壊する恐れがあり、更
にまた、矢板工法は仮締めを行なうだけの工法でしかな
かった。
Further, the above-mentioned deep layer mixing treatment method is only a method of simply hardening the ground with an improving agent such as cement,
If it is used on sandy ground, a defective work may occur, and the load may concentrate and break at the defective work part during an earthquake. Furthermore, the sheet pile construction method was only a temporary fastening method.

【0005】しかも、上記矢板工法以外はいずれも新設
の地盤しか改良することが出来ず、地震により砂質地盤
が液状化して地盤に引張力が働き、地盤が破壊する場
合、砂利杭や砂杭では上記引張力に抵抗する力は全くな
い等の問題点があった。
Moreover, except for the above-mentioned sheet pile construction method, only the newly constructed ground can be improved, and when the sandy ground is liquefied by the earthquake and tensile force acts on the ground and the ground is destroyed, gravel piles and sand piles However, there is a problem that there is no force that resists the tensile force.

【0006】[0006]

【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、その目的とす
るところは、地震時の砂質地盤の液状化により生ずる地
盤の引張り破壊を効果的に防止し、地震後の残留沈下を
防止し得るだけでなく、タンク、河川堤防、盛り土、埋
設物、半地下構造物等の既存の構造物にも効果的に対処
することができる排水補強杭を提供することにある。
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and the purpose of the present invention is to make tensile breakage of ground caused by liquefaction of sandy ground during an earthquake. Not only can prevent residual settlement after an earthquake, but also can effectively deal with existing structures such as tanks, river levees, embankments, buried objects, and semi-underground structures. To provide drainage reinforcement piles.

【0007】[0007]

【課題を解決するための手段】本発明の排水補強杭は、
砂質地盤中に削孔された長孔内に、凹凸状の表面を有す
る異形PC棒を配置し、該異形PC棒と上記長孔の隙間
に砕石を密に充填して構成したことを特徴とし、また、
砂質地盤中に削孔された長孔内に、数本の主筋とフープ
筋から成る籠鉄筋を配置し、該籠鉄筋と上記長孔の隙間
に砕石を密に充填して構成したことを特徴とする。
The drainage reinforcement pile of the present invention comprises:
Characterized by arranging a deformed PC rod having an uneven surface in a long hole drilled in the sandy ground and densely filling crushed stones in the gap between the deformed PC rod and the long hole And again
Inside the long hole drilled in the sandy ground, basket rebar consisting of several main bars and hoop bars is arranged, and the gap between the basket bar and the long hole is densely filled with crushed stone. Characterize.

【0008】[0008]

【実施例】以下、本発明の一実施例について図面を参照
しながら説明する。図1において、1は砂質地盤であっ
て、その中にボックス型埋設管等の埋設物2や掘割道路
等の半地下構造物3が構築されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a sandy ground in which a buried object 2 such as a box-type buried pipe and a semi-underground structure 3 such as an excavated road are constructed.

【0009】これらの埋設物2や半地下構造物3の周囲
地盤の液状化危険領域Aには、本発明の小口径の排水補
強杭4が地表面に対して傾斜方向あるいは鉛直方向に打
設されている。
In the liquefaction risk area A of the ground surrounding these buried objects 2 and semi-underground structures 3, the small diameter drainage reinforcement pile 4 of the present invention is laid in the inclined direction or the vertical direction with respect to the ground surface. Has been done.

【0010】上記排水補強杭4の上端部は、地表面に露
出していて、集水マス5に接続されている。従って、該
排水補強杭4により吸水されて上昇してきた間隙水は、
該集水マス5に集められて排水されるようになってい
る。尚、上記排水補強杭4の上端部は根固めコンクリー
ト等による地盤定着手段により地表地盤に定着されてい
る。
The upper end of the drainage reinforcement pile 4 is exposed on the ground surface and is connected to the water collecting mass 5. Therefore, the pore water absorbed by the drainage reinforcement pile 4 and rising is
The water is collected in the water collecting mass 5 and drained. The upper end portion of the drainage reinforcement pile 4 is fixed to the surface ground by means of ground fixing means such as concrete cement.

【0011】上記排水補強杭4の構造は、例えば図2に
示すように、地盤1中に削孔された長孔内に内径100
mmで節径150mm程度の凹凸表面を有する異形PC
棒4aを配置して、その周囲に約25mm以下の砕石4
bを密に充填し、杭径約250mmに構成したものであ
る。
The structure of the drainage reinforcement pile 4 is, for example, as shown in FIG. 2, an inner diameter of 100 in a long hole drilled in the ground 1.
Deformed PC with an uneven surface with a node diameter of 150 mm in mm
A bar 4a is placed around the crushed stone 4 of about 25 mm or less.
b is densely packed and has a pile diameter of about 250 mm.

【0012】従って、上記砕石4bは周囲の砂質地盤1
に噛み合うと共に、異形PC棒4aにも噛み合っている
ので、例えば地盤1に引張力が作用すると、この引張力
が砕石4bを介して異形PC棒4aに伝えられ、その結
果、該異形PC棒4aが地盤1の引張力に抵抗する。ま
た、地盤1の圧縮力も異形PC棒4aおよび砕石4bに
よって抵抗力を受ける。
Therefore, the crushed stone 4b is the sandy ground 1 around it.
Since the deformed PC rod 4a also meshes with the deformed PC rod 4a, for example, when a tensile force acts on the ground 1, this tensile force is transmitted to the deformed PC rod 4a via the crushed stone 4b. Resists the tensile force of the ground 1. Further, the compressive force of the ground 1 is also resisted by the deformed PC rod 4a and the crushed stone 4b.

【0013】さらに、各砕石4bの間には空隙が存在す
るので、この中に周囲地盤1中の間隙水が吸収されて上
昇し、地表部の集水マス5に集水される。
Further, since there are voids between the crushed stones 4b, pore water in the surrounding ground 1 is absorbed and rises therein, and is collected by the water collecting mass 5 on the surface of the ground.

【0014】更にまた、本発明の排水補強杭4は地表面
に対して傾斜状態に打設することにより、例えば、地震
時に縦方向の振動や横方向の振動のいずれの方向の振動
が生じても、その水平方向または垂直方向の圧縮力およ
び引張力が排水補強杭4の傾斜軸方向の圧縮分力および
引張分力として排水補強杭4に作用し、該排水補強杭4
の抵抗力を受ける。
Furthermore, by mounting the drainage reinforcement pile 4 of the present invention in an inclined state with respect to the ground surface, for example, in the case of an earthquake, vibration in either the vertical direction or the horizontal direction is generated. The horizontal or vertical compressive force and the tensile force act on the drainage reinforcing pile 4 as a compressive component and a tensile component in the inclined axial direction of the drainage reinforcing pile 4, and the drainage reinforcing pile 4
Receive the resistance of.

【0015】図3は第2の発明の実施例を示すもので、
砂質地盤1中に削孔された小口径の長孔内に、例えば1
3mmφ程度の鉄筋を外径150mm程度のフープ筋と
これらのフープ筋を継ぐ主筋から構成された籠鉄筋4c
を建込み、これに約25mm以下の砕石4bを充填し
て、200〜250mm程度の杭径に構成したものであ
る。本発明の排水補強杭4も上記第1の発明の排水補強
杭と同様に、地盤1の引張り抵抗力や排水機能を有す
る。
FIG. 3 shows an embodiment of the second invention.
For example, in the small-diameter long hole drilled in the sandy ground 1,
A cage rebar 4c composed of a reinforcing bar of about 3 mmφ and a hoop bar having an outer diameter of about 150 mm and a main bar connecting these hoop bars.
Was built, and this was filled with crushed stone 4b having a size of about 25 mm or less to form a pile diameter of about 200 to 250 mm. The drainage reinforcement pile 4 of the present invention also has a tensile resistance of the ground 1 and a drainage function, like the drainage reinforcement pile of the first invention.

【0016】図4は、本発明の排水補強杭4をタンク7
の地盤1の液状化危険領域Aに傾斜状態および鉛直状態
で打設した施工例を示すものである。また、本発明の排
水補強杭4はタンクの他に擁壁など浅い(ベタ)基礎構
造物に施工することができる。
FIG. 4 shows the drainage reinforcement pile 4 of the present invention in a tank 7.
2 shows an example of construction in which the ground 1 is placed in the liquefaction risk area A in an inclined state and a vertical state. Further, the drainage reinforcement pile 4 of the present invention can be applied to a shallow (solid) foundation structure such as a retaining wall in addition to a tank.

【0017】図5は、支持杭7のある構造物8の支持地
盤1の液状化危険領域Aに本発明の排水補強杭4を鉛直
状態および傾斜状態で打設した施工例を示したものであ
る。
FIG. 5 shows a construction example in which the drainage reinforcement pile 4 of the present invention is laid in the vertical state and the inclined state in the liquefaction risk area A of the support ground 1 of the structure 8 having the support pile 7. is there.

【0018】以上のように、本発明の排水補強杭は既存
の構造物の真下に斜めに打設することもでき、構造物の
直下に発生する過剰間隙水を速やかに排水して地盤の強
化を図ることができる。
As described above, the drainage reinforcement pile of the present invention can be installed diagonally below the existing structure, and the excess pore water generated immediately below the structure is quickly drained to strengthen the ground. Can be achieved.

【0019】図6は、河川堤防や道路盛土9に施工した
例を示すものであって、排水補強杭4が斜面に対してほ
ぼ直交する状態に打設され、斜面露出部でコルゲートパ
イプ10により集水マス5に集水されるようになってい
る。
FIG. 6 shows an example of construction on a river embankment or road embankment 9, in which drainage reinforcement piles 4 are laid in a state substantially orthogonal to the slope, and corrugated pipe 10 is used at the slope exposed portion. The water is collected in the water collecting box 5.

【0020】[0020]

【発明の効果】【The invention's effect】

1)砂質地盤中に削孔された長孔内に、凹凸状の表面を
有する異形PC棒を配置し、該異形PC棒と上記長孔の
隙間に砕石を密に充填して構成することにより、砕石は
周囲の砂質地盤に噛み合うと共に、異形PC棒にも噛み
合っているので、地盤に引張力が作用すると、この引張
力が砕石を介して異形PC棒に伝えられ、その結果、異
形PC棒が地盤の引張力に抵抗する。また、地盤の圧縮
力も異形PC棒および砕石によって抵抗力を受け、地盤
が強化される。 2)砂質地盤中に削孔された長孔内に、数本の主筋とフ
ープ筋から成る籠鉄筋を配置し、該籠鉄筋と上記長孔の
隙間に砕石を密に充填して構成することにより、砕石は
周囲の砂質地盤に噛み合うと共に、籠鉄筋にも噛み合っ
ているので、地盤に引張力が作用すると、この引張力が
砕石を介して籠鉄筋に伝えられ、その結果、籠鉄筋が地
盤の引張力に抵抗する。また、地盤の圧縮力も籠鉄筋お
よび砕石によって抵抗力を受け、地盤が強化される。
1) Arrange a deformed PC rod having an uneven surface in a long hole drilled in sandy ground, and densely fill crushed stones in the gap between the deformed PC rod and the long hole. As a result, the crushed stone meshes with the surrounding sandy ground as well as with the deformed PC rod, so when a tensile force acts on the ground, this tensile force is transmitted to the deformed PC rod through the crushed stone, resulting in an irregular shape. The PC rod resists the tensile force of the ground. Further, the compressive force of the ground is also resisted by the deformed PC rod and the crushed stone, and the ground is strengthened. 2) A cage rebar consisting of several main bars and hoop bars is placed in a long hole drilled in the sandy ground, and crushed stones are densely filled in the gap between the basket rebar and the long hole. As a result, the crushed stone meshes with the surrounding sandy ground and also with the cage rebar.When tensile force acts on the ground, this tensile force is transmitted to the cage rebar through the crushed stone, and as a result, the cage rebar Resists the tensile force of the ground. The compressive force of the ground is also resisted by the cage rebar and crushed stone, and the ground is strengthened.

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

【図1】地下埋設物や半地下構造構造物地盤への排水補
強杭の施工例を示す図である。
FIG. 1 is a diagram showing an example of construction of a drainage reinforcement pile on an underground buried object or a semi-underground structural structure ground.

【図2】第1の発明の排水補強杭の一実施例を示す構造
図である。
FIG. 2 is a structural view showing an embodiment of the drainage reinforcement pile of the first invention.

【図3】第2の発明の排水補強杭の一実施例を示す構造
図である。
FIG. 3 is a structural view showing an embodiment of the drainage reinforcement pile of the second invention.

【図4】本発明の排水補強杭のタンク地盤への施工例を
示す図である。
FIG. 4 is a diagram showing an example of construction of the drainage reinforcement pile of the present invention on the tank ground.

【図5】本発明の排水補強杭を支持杭のある構造物地盤
への施工例を示す図である。
FIG. 5 is a diagram showing an example of construction of the drainage reinforcement pile of the present invention on a structure ground having a support pile.

【図6】本発明の排水補強杭を道路盛土への施工例を示
す図である。
FIG. 6 is a diagram showing an example of construction of the drainage reinforcement pile of the present invention on a road embankment.

【符号の説明】[Explanation of symbols]

1 砂質地盤 2 埋設物 3 半地下構造物 4 排水補強杭 4a 異形PC棒 4b 砕石 4c 籠鉄筋 5 集水マス 6 タンク 7 支持杭 8 構造物 9 道路盛土 10 コルゲートパイプ 1 Sandy ground 2 Buried object 3 Semi-underground structure 4 Drainage reinforcement pile 4a Deformed PC rod 4b Crushed stone 4c Basket rebar 5 Water collecting mass 6 Tank 7 Support pile 8 Structure 9 Road embankment 10 Corrugated pipe

───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡本 正広 神奈川県横浜市緑区藤ケ丘2−3−17− 403 (72)発明者 越智 健三 神奈川県横浜市緑区霧ガ丘3−22−9− 108 (72)発明者 遠藤 修 神奈川県川崎市宮前区宮崎2−13−12 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masahiro Okamoto 2-3-17-403, Fujigaoka, Midori-ku, Yokohama-shi, Kanagawa 403 (72) Kenzo Ochi 3-22-9- Kirigigaoka, Midori-ku, Yokohama, Kanagawa 108 (72) Inventor Osamu Endo 2-13-12 Miyazaki, Miyazaki-ku, Kawasaki-shi, Kanagawa

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 砂質地盤中に削孔された長孔内に、凹凸
状の表面を有する異形PC棒を配置し、該異形PC棒と
上記長孔の隙間に砕石を密に充填して構成したことを特
徴とする排水補強杭。
1. A deformed PC rod having an uneven surface is arranged in a long hole drilled in a sandy ground, and crushed stones are densely filled in a gap between the deformed PC rod and the long hole. A drainage reinforcement pile characterized by being constructed.
【請求項2】 砂質地盤中に削孔された長孔内に、数本
の主筋とフープ筋から成る籠鉄筋を配置し、該籠鉄筋と
上記長孔の隙間に砕石を密に充填して構成したことを特
徴とする排水補強杭。
2. A cage rebar composed of several main bars and hoop bars is arranged in a long hole drilled in sandy ground, and crushed stones are densely filled in a gap between the basket rebar and the long hole. A drainage reinforcement pile characterized by being configured as follows.
JP4149932A 1992-05-18 1992-05-18 Reinforcing pile for sandy ground Expired - Lifetime JPH0713366B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4149932A JPH0713366B2 (en) 1992-05-18 1992-05-18 Reinforcing pile for sandy ground

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4149932A JPH0713366B2 (en) 1992-05-18 1992-05-18 Reinforcing pile for sandy ground

Publications (2)

Publication Number Publication Date
JPH0617414A true JPH0617414A (en) 1994-01-25
JPH0713366B2 JPH0713366B2 (en) 1995-02-15

Family

ID=15485722

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4149932A Expired - Lifetime JPH0713366B2 (en) 1992-05-18 1992-05-18 Reinforcing pile for sandy ground

Country Status (1)

Country Link
JP (1) JPH0713366B2 (en)

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* Cited by examiner, † Cited by third party
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JP2006299605A (en) * 2005-04-19 2006-11-02 Zenitaka Corp Equipment for countermeasure against liquefaction of ground immediately below underground structure, and equipment and construction method for countermeasure against liquefaction of ground immediately below fill
JP2014012979A (en) * 2012-06-06 2014-01-23 Ohbayashi Corp Liquefaction preventing system and method
CN109629582A (en) * 2019-01-16 2019-04-16 河南省交通规划设计研究院股份有限公司 A kind of abnormity draining friction pile and its construction method

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US9175099B2 (en) 2007-05-09 2015-11-03 Kyoto University Living radical polymerization method using a phosphorus compound or nitrogen compound as a catalyst
EP2749577B1 (en) 2011-08-25 2018-09-19 Kyoto University Living radical polymerization method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60250122A (en) * 1984-05-25 1985-12-10 Takechi Koumushiyo:Kk Foundation pile structure for preventing liquefaction of ground

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60250122A (en) * 1984-05-25 1985-12-10 Takechi Koumushiyo:Kk Foundation pile structure for preventing liquefaction of ground

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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