JP2848212B2 - Cast-in-place concrete pile method - Google Patents
Cast-in-place concrete pile methodInfo
- Publication number
- JP2848212B2 JP2848212B2 JP5261050A JP26105093A JP2848212B2 JP 2848212 B2 JP2848212 B2 JP 2848212B2 JP 5261050 A JP5261050 A JP 5261050A JP 26105093 A JP26105093 A JP 26105093A JP 2848212 B2 JP2848212 B2 JP 2848212B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- pile hole
- ground
- cast
- concrete
- 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
【0001】[0001]
【産業上の利用分野】本発明は、杭先端地盤の剛性を改
良した場所打ちコンクリート杭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 cast-in-place concrete pile method in which the rigidity of a pile tip ground is improved.
【0002】[0002]
【従来の技術】場所打ちコンクリート杭の施工法として
は、アースドリル、オールケーシング、リバース工法な
どにより安定液や泥水などの掘削液を注入して孔壁の崩
壊や先端地盤の異常な緩みなどを防止しながら杭孔を掘
削し、この杭孔に鉄筋籠を挿入したのちトレミー管によ
り水中コンクリートを打設する方法が一般的である。2. Description of the Related Art As a method of casting a cast-in-place concrete pile, a drilling fluid such as a stabilizing solution or muddy water is injected by an earth drill, an all casing, a reverse construction method, etc. to prevent collapse of a hole wall and abnormal loosening of a tip ground. It is a common practice to excavate a pile hole while inserting a steel cage into the pile hole, and then place underwater concrete with a tremy tube.
【0003】[0003]
【発明が解決しようとする課題】従来の工法では掘削液
を使用しているとは言っても、杭孔の掘削時に杭孔周
囲、特に杭孔底の地盤を緩めることとなり、また、杭孔
底にスライムが残存して堆積する。(掘削中スライムを
鋭意除去するが完全には除去しきれず、また、掘削終了
時に根固め液を注入してスライムを固めた場合は水中コ
ンクリートの打設までの間にその上にスライムが沈降堆
積する。)この状態で杭孔に水中コンクリートを打設す
ると、水中コンクリートは地盤に浸透し得ないので、緩
んだ地盤を堅固に固めることにはならず、また、スライ
ムとも一体化しない。その結果、杭の先端地盤に弱点を
残したまま場所打ちコンクリート杭が造成されることと
なり、杭の先端地盤剛性は小さく、極限支持力に達する
までの変形が大きくなる。Although the conventional construction method uses a drilling fluid, the ground around the pile hole, particularly the ground at the bottom of the pile hole, is loosened when excavating the pile hole. Slime remains at the bottom and accumulates. (During excavation, slime was removed thoroughly but could not be completely removed. Also, when slime was solidified by injecting a consolidation liquid at the end of excavation, slime settled and deposited on it before the underwater concrete was poured. If underwater concrete is poured into the pile hole in this state, the underwater concrete cannot penetrate into the ground, so that the loose ground cannot be firmly solidified and does not integrate with the slime. As a result, a cast-in-place concrete pile is created while leaving weak points in the ground at the tip of the pile, and the ground rigidity at the tip of the pile is small, and the deformation before reaching the ultimate bearing capacity is increased.
【0004】[0004]
【課題を解決するための手段】本発明は、上記の従来工
法の欠点を改良するためになされたものであり、緩んだ
杭の先端地盤に浸透することのできるセメントミルクを
先端地盤に注入して緩んだ地盤を堅固に固めながら杭コ
ンクリートと一体化し、併せて堆積するスライムも固め
て杭コンクリートに一体化することによって、場所打ち
コンクリート杭の先端地盤剛性を大きくすることを目的
とする。SUMMARY OF THE INVENTION The present invention has been made in order to improve the above-mentioned drawbacks of the conventional method, and injects cement milk which can penetrate into the tip ground of a loose pile into the tip ground. The purpose is to increase the rigidity at the tip of the cast-in-place concrete pile by solidifying the loose ground and integrating it with the pile concrete while solidifying the slime that accumulates and integrating it into the pile concrete.
【0005】即ち、本発明は、(A)掘削液を注入しな
がら地盤に杭孔を穿孔する工程、(B)鉄筋籠を杭孔に
挿入設置する工程、(C)先端部がトレミー管の周りを
取り囲む形で分岐している注入管をその側方に取付けた
トレミー管を杭孔に挿入設置し、注入管よりセメントミ
ルクを杭孔底に圧入する工程、(D)トレミー管による
杭孔内への水中コンクリートの打設を開始し、注入管付
きトレミー管を引き上げながら打設を続け杭頭部まで打
設する工程、よりなる場所打ちコンクリート杭工法、で
ある。That is, the present invention provides (A) a step of drilling a pile hole in the ground while injecting a drilling fluid, (B) a step of inserting and installing a reinforced cage in the pile hole, and (C) a tip of the tremy pipe. Inserting and installing a tremy tube with the injection pipe branching around it around its side in the pile hole, and pressing cement milk into the pile hole bottom from the injection pipe, (D) Pile hole by the tremy pipe A method of casting concrete underwater into a concrete pile, starting with placing the submerged concrete into the interior, continuing the casting while pulling up the tremy pipe with an injection pipe, and placing it to the pile head.
【0006】本発明の要点は、トレミー管の杭孔への挿
入設置時に、先端部がトレミー管の周りを取り囲む形で
分岐している注入管をトレミー管の側方に取付けてお
き、この注入管をトレミー管と同様に杭孔底まで挿入
し、トレミー管による水中コンクリートの打設の少し前
に注入管を利用して杭の先端地盤にセメントミルクを注
入する点である。注入されたセメントミルクは緩んだ地
盤に浸透して硬化して地盤を固め後から打設される杭コ
ンクリートと一体化され、同時にスライムも固め後から
打設される杭コンクリートと一体化される。The gist of the present invention is that, at the time of insertion and installation of a tremy tube into a pile hole, an injection tube whose distal end is branched so as to surround the periphery of the tremy tube is attached to the side of the tremy tube. The point is that the pipe is inserted to the bottom of the pile hole in the same way as the tremy pipe, and cement milk is injected into the ground at the tip of the pile using the injection pipe shortly before the underwater concrete is poured by the tremy pipe. The injected cement milk penetrates into the loose ground and hardens, and is integrated with the pile concrete that is cast after solidifying the ground, and at the same time, the slime is also integrated with the pile concrete that is cast after the solidification.
【0007】[0007]
【実施例】以下図面を参照しながら本発明を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
【0008】図1は本発明の施工工程を示す立断面図で
ある。図1に従って本発明の施工手順を説明する。FIG. 1 is a vertical sectional view showing the construction process of the present invention. The construction procedure of the present invention will be described with reference to FIG.
【0009】(1)掘削液2を注入しながら掘削機によ
り地盤を所定の深さまで掘削し、杭孔1を穿孔する。
(図1(a)) (2)鉄筋籠3を杭孔1内に挿入設置する。(図1
(b)) (3)トレミー管5に注入管4を取付けながら両者を杭
孔1内へ先端が杭孔底に達するまで挿入して設置する。
注入管4は鋼管もしくはプラスチック管であり、両端に
切られた螺子によって接続しながらトレミー管5に取付
けられる。注入管4の先端には小孔が方向をかえて穿孔
されていて圧入されるセメントミルクが杭孔底に均一に
圧入できるようにしてある。(図1(c)) (4)注入管4により杭孔底の地盤にセメントミルク7
を圧入する。(図1(d)) (5)トレミー管5より杭孔1内への水中コンクリート
の打設を開始する。トレミー管5および注入管4を引き
上げながら打設を続け杭頭部まで打設する。(図1
(e))後は通常のように杭頭処理を行って杭の施工は
完了する。(1) The ground is excavated to a predetermined depth by an excavator while pouring the excavating liquid 2, and the pile hole 1 is drilled.
(FIG. 1A) (2) Insert the reinforcing bar 3 into the pile hole 1. (Figure 1
(B)) (3) While attaching the injection pipe 4 to the tremy pipe 5, insert both of them into the pile hole 1 until the tip reaches the pile hole bottom.
The injection tube 4 is a steel tube or a plastic tube, and is attached to the tremy tube 5 while being connected by screws cut at both ends. A small hole is bored at the tip of the injection pipe 4 with a different direction so that the cement milk to be pressed can be uniformly pressed into the bottom of the pile hole. (Fig. 1 (c)) (4) Cement milk 7 is poured into the ground at the bottom of the pile hole by the injection pipe 4.
Press-fit. (FIG. 1 (d)) (5) Pour of underwater concrete into the pile hole 1 from the tremy tube 5 is started. Pouring is continued while pulling up the tremy pipe 5 and the injection pipe 4 to the pile head. (Figure 1
(E)) After that, the pile head processing is performed as usual, and the construction of the pile is completed.
【0010】図2はトレミー管5に注入管4を取付けた
構造の一例を示したもので、(a)は立断面図、(b)
は(a)のA−A矢視図、(c)は(a)のB−B矢視
図、である。FIG. 2 shows an example of a structure in which the injection tube 4 is attached to the tremie tube 5, (a) is a vertical sectional view, and (b).
(A) is a view taken along the line AA, and (c) is a view taken along the line BB in (a).
【0011】この例では幾つかの鋼板で構成される一方
接続金物9および三方接続金物10を使用して、トレミ
ー管5および注入管4の周囲を挟み込む形でボルト締め
して接続している。この例では先端部では注入管4はト
レミー管5の周りを取り囲む形で3本に分岐し、各注入
管4の先端には多方向に向いた小孔11が穿孔されてい
て、先端地盤へのセメントミルク7の均一な注入が図ら
れている。注入管4の分岐する数は多い程より均一な注
入が図られるが、通常3、4本程度に分岐している。注
入管4を接続する必要がある場合には両端に切られたネ
ジ8により接続する。In this example, one-way metal fittings 9 and three-way metal fittings 10 made of several steel plates are used to connect the tremy tube 5 and the injection tube 4 by bolting them around the periphery thereof. In this example, at the tip, the injection pipe 4 is branched into three so as to surround the tremie pipe 5, and at the tip of each injection pipe 4, a multi-directional small hole 11 is drilled. The uniform injection of the cement milk 7 is achieved. The more the number of branches of the injection tube 4, the more uniform injection can be achieved, but usually the number of branches is about three or four. When it is necessary to connect the injection pipe 4, it is connected by screws 8 cut at both ends.
【0012】[0012]
【発明の効果】杭の先端の緩んだ地盤に浸透することの
できるセメントミルクを先端地盤にできるだけ均一に注
入することによって、緩んだ地盤を堅固に固めながら杭
コンクリートと一体化し、併せて残存するスライムも固
めて杭コンクリートに一体化することができるので、場
所打ちコンクリート杭の先端地盤剛性を大きくすること
ができる。According to the present invention, cement milk which can penetrate into the loose ground at the tip of the pile is poured into the ground at the tip as uniformly as possible, so that the loose ground is integrated with the pile concrete while firmly solidifying and remains together. Since the slime can also be solidified and integrated into the pile concrete, the ground rigidity at the tip of the cast-in-place concrete pile can be increased.
【図1】本発明の施工工程を示す立断面図である。FIG. 1 is a vertical sectional view showing a construction step of the present invention.
【図2】トレミー管に注入管4を接続した構造の一例を
示すもので、(a)は立断面図、(b)は(a)のA−
A矢視図、(c)は(a)のB−B矢視図、である。FIGS. 2A and 2B show an example of a structure in which an injection pipe 4 is connected to a tremie pipe, wherein FIG. 2A is a vertical sectional view, and FIG.
FIG. 2A is a view as seen from the direction of the arrow A, and FIG.
1・・杭孔、2・・掘削液、3・・鉄筋籠、4・・注入
管、5・・トレミー管、6・・コンクリート、7・・セ
メントミルク、8・・ネジ、9・・一方接続金物、10
・・三方接続金物、11・・小孔。1. Pile hole, 2. Drilling fluid, 3. Reinforcing cage, 4. Injection pipe, 5. Ptolemy pipe, 6. Concrete, 7. Cement milk, 8. Screw, 9. One side Connection hardware, 10
..Three-way connection hardware, 11...
Claims (1)
を穿孔する工程、(B)鉄筋籠を杭孔に挿入設置する工
程、(C)先端部がトレミー管の周りを取り囲む形で分
岐している注入管をその側方に取付けたトレミー管を杭
孔に挿入設置し、注入管よりセメントミルクを杭孔底に
圧入する工程、(D)トレミー管による杭孔内への水中
コンクリートの打設を開始し、注入管付きトレミー管を
引き上げながら打設を続け杭頭部まで打設する工程、よ
りなる場所打ちコンクリート杭工法。(A) a step of drilling a pile hole in the ground while pouring a drilling fluid; (B) a step of inserting and installing a reinforcing cage in the pile hole; and (C) a form in which the tip surrounds the periphery of the tremy tube. Inserting a tremy tube with an injection pipe branched at the side into the pile hole and installing it in the pile hole, and pressing cement milk from the injection pipe into the bottom of the pile hole, (D) submerging into the pile hole by the tremy tube A cast-in-place concrete pile method consisting of starting concrete placement, continuing the placement while pulling up the tremy tube with an injection pipe, and placing it to the pile head.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5261050A JP2848212B2 (en) | 1993-10-19 | 1993-10-19 | Cast-in-place concrete pile method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5261050A JP2848212B2 (en) | 1993-10-19 | 1993-10-19 | Cast-in-place concrete pile method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07113229A JPH07113229A (en) | 1995-05-02 |
JP2848212B2 true JP2848212B2 (en) | 1999-01-20 |
Family
ID=17356372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5261050A Expired - Fee Related JP2848212B2 (en) | 1993-10-19 | 1993-10-19 | Cast-in-place concrete pile method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2848212B2 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006299601A (en) * | 2005-04-19 | 2006-11-02 | Ciatec Ltd | Construction method for driving cast-in-place pile |
CN104153352B (en) * | 2014-07-31 | 2017-02-15 | 广西科技大学 | Karst geology rotary-drilling bored concrete pile hole forming process |
CN113356190B (en) * | 2021-05-08 | 2022-11-18 | 深圳市工勘岩土集团有限公司 | Pile forming method for cast-in-place pile in karst development area |
CN113404043A (en) * | 2021-05-24 | 2021-09-17 | 中煤江南建设发展集团有限公司 | Construction method of full-rotation full-casing drilling machine suitable for karst cave geology |
CN113914303B (en) * | 2021-09-28 | 2023-05-26 | 深圳市桥梁维修设备科技有限公司 | Reverse circulation construction method for bored pile |
CN113914307B (en) * | 2021-09-28 | 2023-05-26 | 深圳市桥梁维修设备科技有限公司 | Reverse circulation construction method for sand-separated synchronous bored pile |
CN113914302B (en) * | 2021-09-28 | 2023-05-26 | 深圳市桥梁维修设备科技有限公司 | Drilling bored concrete pile mud grit splitter |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0712422Y2 (en) * | 1990-06-12 | 1995-03-22 | 東急建設株式会社 | Grout injection device at the tip of cast-in-place concrete pile |
JP2857803B2 (en) * | 1990-09-21 | 1999-02-17 | 株式会社竹中工務店 | Piles and continuous underground walls with large tip bearing capacity |
-
1993
- 1993-10-19 JP JP5261050A patent/JP2848212B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH07113229A (en) | 1995-05-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19981006 |
|
LAPS | Cancellation because of no payment of annual fees |