JP2533853B2 - Pile construction method - Google Patents
Pile construction methodInfo
- Publication number
- JP2533853B2 JP2533853B2 JP61108711A JP10871186A JP2533853B2 JP 2533853 B2 JP2533853 B2 JP 2533853B2 JP 61108711 A JP61108711 A JP 61108711A JP 10871186 A JP10871186 A JP 10871186A JP 2533853 B2 JP2533853 B2 JP 2533853B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- bag
- diameter
- cement
- ready
- 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.)
- Expired - Fee Related
Links
Landscapes
- Piles And Underground Anchors (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、土木、建築構造物の基礎として利用される
杭の造成法に関するものである。TECHNICAL FIELD The present invention relates to a method for constructing a pile used as a foundation for civil engineering and a building structure.
従来、予め杭径よりも大きな掘削孔を掘削することに
より既製杭の沈設を行うプレボーリング法において、杭
周辺部の空隙、即ち杭と掘削孔の間の間隙を埋める方法
として、掘削孔にセメントミルク等の杭周固定液を注入
した後、その掘削孔に既製杭を埋設している。Conventionally, in the pre-boring method in which the prefabricated pile is sunk by excavating a drill hole larger than the pile diameter in advance, as a method of filling the void around the pile, that is, the gap between the pile and the drill hole, cement is applied to the drill hole. After injecting a pile circumference fixing liquid such as milk, a ready-made pile is buried in the excavation hole.
しかし、従来技術では、既製杭を埋設した後にも杭周
固定液が硬化するまでの間に掘削孔周辺地盤が緩めら
れ、杭周辺で杭周固定液が硬化しても、水平方向地盤反
力係数の低下を招く。However, in the conventional technology, even after burying the ready-made pile, the ground around the drill hole is loosened until the pile circumference fixing liquid hardens, and even if the pile circumference fixing liquid hardens around the pile, the horizontal ground reaction force It causes a decrease in the coefficient.
また、地盤中に透水層があると、この部分で逸水が起
こり、杭固定液が固定する前になくなり、水平方向地盤
反力係数が更に低下する場合がある。Further, if there is a water permeable layer in the ground, water leakage may occur in this part, and the pile fixing liquid may disappear before being fixed, and the horizontal ground reaction force coefficient may further decrease.
本発明は上述した従来技術における欠点に鑑み発明さ
れたものであり、本発明の目的は、予め杭径よりも大き
な掘削孔を掘削することにより既製杭の沈設を行うプレ
ボーリング法において、水平方向、即ち横方向地盤反力
係数を大きくできる工法を提供することである。The present invention has been invented in view of the above-mentioned drawbacks in the prior art, and an object of the present invention is to pre-boring a prefabricated pile by excavating an excavation hole larger than the pile diameter in advance, in the horizontal direction. That is, it is to provide a construction method capable of increasing the lateral ground reaction force coefficient.
本発明は、予め掘削された杭径よりも大きな掘削孔に
既製杭を埋設する工法に於いて、頭部が地表近くに存在
するようになる既製杭としてその杭の頭部のみの外周面
に布製の筒状袋体をその筒状袋体の上下部にて取り付け
た杭を使用し、該既製杭を杭径よりも大きな掘削孔に埋
設して該袋体を地中に位置させた後、該袋体中にセメン
ト硬化体を圧入することにより該袋体を地中で膨張さ
せ、該袋体を該掘削孔壁に強く押しつけ、その状態でセ
メント硬化体を硬化させることを特徴とする杭の造成法
である。The present invention is a method of burying a prefabricated pile in a drilling hole larger than the diameter of a preliminarily excavated pile, and as a prefabricated pile whose head is near the surface of the earth, only on the outer peripheral surface of the head of the pile. After using a pile in which a tubular bag made of cloth is attached at the upper and lower parts of the tubular bag, burying the ready-made pile in a drilling hole larger than the pile diameter and positioning the bag in the ground Characterized in that the cement hardened body is expanded in the ground by press-fitting the cement hardened body into the bag body, and the bag body is strongly pressed against the wall of the excavation hole, and the cement hardened body is hardened in that state. It is a method of constructing piles.
本発明において、掘削孔は埋設する既製杭の径よりも
大きな径を有するものである。このようにすることによ
り既製杭がトラブルなく掘削孔に埋設できる。In the present invention, the excavation hole has a diameter larger than the diameter of the ready-made pile to be buried. By doing so, ready-made piles can be buried in the excavation hole without any trouble.
また、本発明で使用され、頭部が地表近くに存在する
ようになる既製杭は、布製の筒状袋体がその筒状袋体の
上下にて該既製杭の頭部のみの外周面に取り付けられて
いる。この筒状の袋体は、膨張した際の径は杭外径より
も大きな径を持つものであり、この径の大きな袋体の中
に既製杭を挿入し、筒状袋体の両端をバンド、接着剤等
を用いて既製杭の外周に取り付けるようにして準備され
る。In addition, the ready-made pile used in the present invention, in which the head is located near the surface of the earth, the tubular bag made of cloth is on the outer peripheral surface of only the head of the ready-made pile above and below the tubular bag. It is installed. This tubular bag has a diameter when inflated that is larger than the pile outer diameter.Insert a ready-made pile into the bag with this large diameter, and put both ends of the tubular bag into a band. It is prepared to be attached to the outer periphery of the ready-made pile using an adhesive or the like.
また、この筒状袋体に、杭埋設後に外部よりセメント
硬化体を注入できるよう杭若しくは袋体に注入口を設け
ておく。Further, an injection port is provided in the pile or bag so that the cement hardened body can be injected from the outside after the pile is buried in the tubular bag.
本発明に用いる袋体は、ナイロン、ビニロン、ポリエ
ステル等の布製のものを用いるが、袋体からの脱水が多
すぎる場合はゴムコーティング等により脱水量を調節し
てもよい。このようにして袋体として布製のものを使用
すると、袋体中に注入したセメント硬化体中からの水の
脱水が図れる。The bag used in the present invention is made of a cloth such as nylon, vinylon, polyester or the like, but when the bag is dehydrated too much, the amount of dehydration may be adjusted by rubber coating or the like. In this way, when the cloth body is used as the bag body, water can be dehydrated from the cement hardened body injected into the bag body.
袋体内に圧入するセメント硬化体は、セメントミル
ク、モルタル、コンクリート等を用いる。Cement milk, mortar, concrete or the like is used as the cement hardened body to be pressed into the bag body.
なお、地中の筒状袋体がセメント硬化体の注入により
十分に膨張したかどうかの判定は、注入ポンプにかかる
圧力およびセメント硬化体の注入量により推定できる。It should be noted that whether or not the tubular bag body in the ground has sufficiently expanded due to the injection of the cement hardening body can be estimated by the pressure applied to the injection pump and the injection amount of the cement hardening body.
本発明の一実施例を以下に示す。 An example of the present invention will be described below.
ベントナイト溶液の掘削液をオーガーヘッドの先端か
ら注入しながら掘削し、所定の深度まで達した後、先端
部に根硬め用のセメントミルクを注入してオーガーを引
き上げ掘削孔を造成した。Drilling was performed while pouring a bentonite solution drilling solution from the tip of the auger head, and after reaching a predetermined depth, cement milk for root hardening was injected into the tip to raise the auger to form a drill hole.
使用したオーガーの直径は、沈設しようとする既製杭
の直径よりも50ミリ大きな径のものであり、掘削孔も沈
設しようとする既製杭の直径よりも大きくなった。沈設
に使用する杭の直径は350ミリである。The diameter of the auger used was 50 mm larger than the diameter of the ready-made pile to be sunk, and the drill hole was also larger than the diameter of the ready-made pile to be sunk. The diameter of the pile used for the laying is 350 mm.
次に、掘削孔内に下杭を吊り込んで建込み、この上の
頭部が地表近くに存在するようになる既製杭として、第
１図に示すように、注入管４及び杭頭部の４メートルの
区間のみにナイロン製筒状袋体２をその上下端部で鋼製
バンド３によって取り付けた既製杭（上杭）１を吊り込
み、下杭と上杭との端部金物同志を通常の杭の施工と同
様に溶接により接続し、掘削孔内に埋設した。Next, as a ready-made pile in which the lower pile is suspended and erected in the excavation hole, and the head above this exists near the surface of the earth, as shown in FIG. A nylon tubular bag 2 is attached only to the section of 4 meters at its upper and lower ends by a ready-made pile (upper pile) 1 attached with steel bands 3, and the end metal fittings between the lower pile and the upper pile are usually used. They were connected by welding in the same way as the construction of the piles and were buried in the excavation hole.
なお、使用した筒状袋体は直径が450ミリで、セメン
ト硬化体の注入によりこの大きさまで膨張できるもので
ある。また、杭の埋設は自重及び圧入により実施した。The tubular bag used has a diameter of 450 mm and can be inflated to this size by injecting the cement hardened body. The piles were buried by their own weight and press fit.
第１図に示すように袋体を地中に位置させた後、注入
管４より低圧のモルタルポンプを用い、水セメント比67
％のセメントミルクにブリージング防止剤を対セメント
比１％添加したセメント硬化体を筒状袋体内に圧入し
た。After placing the bag in the ground as shown in FIG.
% Cement milk to which a bleeding inhibitor was added at a cement ratio of 1% was pressed into a cylindrical bag.
ポンプの注入圧が3Kg/cm2となり、注入量が250とな
り、セメントミルク中から水が脱水しながら、筒状袋体
の平均直径が450ミリとなり、袋体を該掘削孔壁に強く
押しつけると共に掘削孔の直径の400ミリよりも大きく
なったのでセメント硬化体の注入を終了し、モルタルポ
ンプ等を外した。この状態で筒状セメント内のセメント
硬化体を硬化させた。The injection pressure of the pump was 3 Kg / cm 2 , the injection amount was 250, while the water was dehydrated from the cement milk, the average diameter of the cylindrical bag was 450 mm, and the bag was strongly pressed against the wall of the drilled hole. Since the diameter of the drill hole became larger than 400 mm, the injection of the hardened cement was completed and the mortar pump etc. was removed. In this state, the hardened cement in the tubular cement was hardened.
このようにして杭周辺部の空隙、即ち掘削孔の間の間
隙を掘削孔の上部のみで塞いだ。In this way, the gap around the pile, that is, the gap between the drill holes was closed only by the upper part of the drill hole.
セメント硬化体が十分硬化した後、造成した杭の水平
載荷試験を実施した。その結果、Y.L.Chngの方法により
逆算した横方向地盤反力係数Ｋは変位１センチで約1,5K
g/cm3であり、この値は土質柱状図より判断したＫ値の
計算値である0.8Kg/cm3の1.9倍であった。After the hardened cement was sufficiently hardened, a horizontal loading test was performed on the constructed pile. As a result, the lateral ground reaction force coefficient K calculated back by the method of YLChng is about 1,5K per displacement of 1 cm.
The value was g / cm 3 , which was 1.9 times the calculated K value of 0.8 Kg / cm 3 determined from the soil columnar chart.
また、本発明の上杭を使用せずに、袋体が取り付けら
れていない杭を上杭として使用し、杭の埋設前に、掘削
孔内に上記実施例で使用した組成のセメントミルクを杭
周固定液として使用した場合の横方向地盤反力係数Ｋは
変位１センチで約1.0Kg/cm3であり、上記実施例の場合
の2/3と低い値であった。Further, without using the upper pile of the present invention, the pile without the bag body attached is used as the upper pile, and the cement milk having the composition used in the above-mentioned example is piled in the excavation hole before burying the pile. When used as a circumferential fixative, the lateral ground reaction force coefficient K was about 1.0 kg / cm 3 at a displacement of 1 cm, which was a low value of 2/3 of that in the above-mentioned embodiment.
本発明に従えば、セメント硬化体の圧入によりセメン
ト硬化体中の水分を脱水しながら布製の筒状袋体が膨張
され、掘削孔の上部の周辺地盤に密着し、更に、この袋
体の膨張により掘削時に緩められた掘削孔上部周辺地盤
を復元及び強化でき、その状態で袋体内のセメント硬化
体が硬化されるので、掘削孔の上部にのみ袋体が膨張す
るようにした本発明の構成としただけで、横方向地盤反
力係数Ｋ値が大くなり、水平方向の大きな支持力が得ら
れる。According to the present invention, the tubular bag made of cloth is inflated while dewatering the water in the hardened cement by press-fitting of the hardened cement, and adheres to the ground around the upper part of the excavation hole, and further the expansion of this bag Due to this, the ground around the upper part of the excavation hole that has been loosened during excavation can be restored and strengthened, and the cement hardening body in the bag body is hardened in that state, so that the bag body expands only above the excavation hole. Only by doing so, the lateral ground reaction force coefficient K value becomes large, and a large horizontal supporting force can be obtained.
更に、袋体内に硬化したセメント硬化体は杭体と一体
化した状態となるので、拡頭杭となり、杭等の径が大き
くなっただけ、水平力による杭頭の水平変位量が小さく
なる。Further, since the cement hardened body hardened in the bag body is integrated with the pile body, it becomes an expanded pile and the horizontal displacement amount of the pile head due to the horizontal force becomes smaller as the diameter of the pile and the like increases.
【図面の簡単な説明】 第１図は本発明のセメント硬化体の注入後の縦断面側面
図、第２図は第１図のＡ−Ａ線断面図である。 １……既製杭、２……筒状袋体、３……鋼製バンド ４……注入管、５……セメント硬化体、６……掘削孔BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical cross-sectional side view of a cement hardened product of the present invention after injection, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 ... Ready-made pile, 2 ... Cylindrical bag, 3 ... Steel band 4 ... Injection pipe, 5 ... Cement hardening body, 6 ... Drilling hole
Claims (1)
既製杭を埋設する工法に於いて、頭部が地表近くに存在
するようになる既製杭としてその杭の頭部のみの外周面
に布製の筒状袋体をその筒状袋体の上下部にて取り付け
た杭を使用し、該既製杭を杭径よりも大きな掘削孔に埋
設し、該袋体を地中に位置させた後、該袋体中にセメン
ト硬化体を圧入することにより該袋体を地中で膨張さ
せ、該袋体を該掘削孔壁に強く押しつけ、その状態でセ
メント硬化体を硬化させることを特徴とする杭の造成
法。1. A method for burying a prefabricated pile in a drilling hole having a diameter larger than the diameter of a preliminarily excavated pile, and as the prefabricated pile whose head is near the surface of the earth, the outer peripheral surface of only the head of the pile. Using a pile in which a tubular bag made of cloth is attached to the upper and lower parts of the tubular bag, the ready-made pile is embedded in an excavation hole larger than the diameter of the pile, and the bag is positioned in the ground. Thereafter, the cement hardened body is pressed into the bag to expand the bag body in the ground, the bag body is strongly pressed against the wall of the excavation hole, and the cement hardened body is cured in that state. How to create a pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61108711A JP2533853B2 (en) | 1986-05-14 | 1986-05-14 | Pile construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61108711A JP2533853B2 (en) | 1986-05-14 | 1986-05-14 | Pile construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62268418A JPS62268418A (en) | 1987-11-21 |
| JP2533853B2 true JP2533853B2 (en) | 1996-09-11 |
Family
ID=14491655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61108711A Expired - Fee Related JP2533853B2 (en) | 1986-05-14 | 1986-05-14 | Pile construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2533853B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008291574A (en) * | 2007-05-28 | 2008-12-04 | Asahi Kasei Construction Materials Co Ltd | Bag body for pile body, pile with bag body, and pile body installation method |
| KR101816001B1 (en) * | 2015-10-21 | 2018-01-08 | 한국도로공사 | Apparatus for supporting an augered pile and method thereof |
| KR101816006B1 (en) * | 2015-10-21 | 2018-02-21 | 한국도로공사 | Method for supporting an augered pile and apparatus thereof |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4532755B2 (en) * | 2001-02-02 | 2010-08-25 | 芦森工業株式会社 | Embedded pile bag and construction method thereof |
| JP5471381B2 (en) * | 2009-12-07 | 2014-04-16 | 株式会社大林組 | Filling reinforcement method |
| JP6507787B2 (en) * | 2015-03-27 | 2019-05-08 | ジャパンパイル株式会社 | Pile foundation repair method, pile foundation repair kit and pile foundation structure |
| JP6513502B2 (en) * | 2015-06-17 | 2019-05-15 | 株式会社竹中工務店 | Pile body construction method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3780975A (en) * | 1971-11-23 | 1973-12-25 | L Turzillo | Means for producing cast-in-place structures in situ |
| JPS5869307U (en) * | 1981-10-30 | 1983-05-11 | 株式会社東芝 | Arm holding device |
-
1986
- 1986-05-14 JP JP61108711A patent/JP2533853B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008291574A (en) * | 2007-05-28 | 2008-12-04 | Asahi Kasei Construction Materials Co Ltd | Bag body for pile body, pile with bag body, and pile body installation method |
| KR101816001B1 (en) * | 2015-10-21 | 2018-01-08 | 한국도로공사 | Apparatus for supporting an augered pile and method thereof |
| KR101816006B1 (en) * | 2015-10-21 | 2018-02-21 | 한국도로공사 | Method for supporting an augered pile and apparatus thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62268418A (en) | 1987-11-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |