JPS6332019A - Construction of hollow pile serving also as earth anchor - Google Patents

Construction of hollow pile serving also as earth anchor

Info

Publication number
JPS6332019A
JPS6332019A JP17689986A JP17689986A JPS6332019A JP S6332019 A JPS6332019 A JP S6332019A JP 17689986 A JP17689986 A JP 17689986A JP 17689986 A JP17689986 A JP 17689986A JP S6332019 A JPS6332019 A JP S6332019A
Authority
JP
Japan
Prior art keywords
pile
earth anchor
mortar
steel
hollow 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
JP17689986A
Other languages
Japanese (ja)
Other versions
JPH0355613B2 (en
Inventor
Hiroshi Ogawa
浩 小川
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 JP17689986A priority Critical patent/JPS6332019A/en
Publication of JPS6332019A publication Critical patent/JPS6332019A/en
Publication of JPH0355613B2 publication Critical patent/JPH0355613B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To increase the resisting force of a pile by a method in which cement mortar is poured to the bottom of a pit, a hollow pile and a PC steel connected with a tremie tube and an earth anchor are inserted before the mortar hardens, cement mortar is injected into the pile, and the PC steel is tensed. CONSTITUTION:Excavation is made to a given bearing layer B by an excavator 4 to form a pit C, and cement mortar 5 is poured into the bottom of the pit C. Before the mortar 5 hardens, a hollow pile 3 is penetrated into the bottom (c) of the pit C. A tremie tube 6 and a PC steel 1 are inserted into the pile 3 and the head of the pile 3 is driven to the foundation 7 of a structure by a plier pile 8. An earth anchor 2 is connected to the lower end of the PC steel 1 and hung down to the bottom of the pit C, and cement mortar 9 is injected into the pile 3 through the tube 6 being pulled up to form an underground pile A. The PC steel 1 is tensed and its upper end is fixed to the foundation 7. The uplift of the structure by pressure of water can thus be effectively prevented.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は構造物の水圧等による浮上り防止を兼ねる地
中杭を形成する、アースアンカー兼用中空パイルの施工
方法に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of constructing a hollow pile that also serves as an earth anchor, which forms an underground pile that also serves to prevent structures from floating due to water pressure or the like.

(発明が解決しようとする問題点) 近年構造物の基礎等底盤の薄肉化に伴い、構造物下の地
中杭には主に底盤に作用する水圧による構造物の浮上り
に対する抵抗力を持たせることが必要になる。
(Problem to be solved by the invention) In recent years, as the bottom of structures such as foundations has become thinner, underground piles under the structure have to have resistance against uplift of the structure mainly due to water pressure acting on the bottom. It will be necessary to do so.

この発明はこうした事情を基になされたもので中空パイ
ルによる地中杭先端部にアースアンカーを定着し、これ
に接続されたPC鋼材を緊張することにより杭に抵抗力
を与えようとするものである。
This invention was made based on these circumstances, and aims to provide resistance to the pile by fixing an earth anchor at the tip of an underground pile made of hollow piles and tensioning the PC steel material connected to this. be.

(問題点を解決するだめの手段) 本発明では中空パイルにより形成した地中杭の先端部に
、PC鋼材に接続されたアースアンカーを定着させてP
C鋼材にプレストレスを導入することにより杭に水圧等
による上向きの力に対する抵抗力を持たせる。
(Another means to solve the problem) In the present invention, an earth anchor connected to a prestressing steel material is fixed to the tip of an underground pile formed by a hollow pile.
By introducing prestress into the C steel material, the pile is made to have resistance to upward forces caused by water pressure, etc.

アースアンカーは根固め用にモルタルが注入される掘削
孔の孔底部に、モルタル硬化前に中空パイル、トレミー
管とともに挿入される。そして中空パイル内にトレミー
管を通じてモルタルを注入し、アースアンカーを孔底部
に定着させた後、PC鋼材を緊張して杭に下向きの力を
与える。
The earth anchor is inserted into the bottom of the excavation hole where mortar is injected for foot protection, together with the hollow pile and tremie pipe, before the mortar hardens. After injecting mortar into the hollow pile through the tremie pipe and fixing the earth anchor at the bottom of the hole, the prestressing steel is tensed to apply downward force to the pile.

(実施例) 以下本発明をコンクリート製の中空パイルによる一実施
例を示す図面に基づいて説明する。
(Example) The present invention will be described below based on drawings showing an example using concrete hollow piles.

この発明はPCC鋼材の下端に接続されたアースアンカ
ー2を掘削孔Cの孔底部Cに定着させて中空パイル3に
より地中杭Aを施工する方法である。
This invention is a method of constructing an underground pile A using a hollow pile 3 by fixing an earth anchor 2 connected to the lower end of a PCC steel material to the bottom C of an excavated hole C.

初めに第1図により施工手順を説明する。First, the construction procedure will be explained using Figure 1.

まず掘削機4により所定の支持層Bまで掘削して掘削孔
Cを形成しく工)、その孔底部Cに根固め用のモルタル
5を注入する(II)。
First, an excavator 4 excavates to a predetermined support layer B to form an excavated hole C), and mortar 5 for foot protection is injected into the bottom C of the hole (II).

続いてモルタル5の硬化前に掘削孔C内に孔底部Cまで
中空パイル3を打ち込み(■)、更に中空パイル3内を
通じてトレミー管6及びPCC鋼材を挿入する(IV)
。中空パイル3の杭頭は構造物の基礎7位置までやっと
こ杭8により打ち込まれる。まだPC鋼材1の下端には
アースアンカー2が接続されており、アースアンカー2
は孔底まで吊り下げられる。
Next, before the mortar 5 hardens, the hollow pile 3 is driven into the excavated hole C up to the bottom C (■), and the tremie pipe 6 and PCC steel material are further inserted through the hollow pile 3 (IV).
. The pile head of the hollow pile 3 is driven into the foundation 7 position of the structure by means of a pin pile 8. Earth anchor 2 is still connected to the lower end of PC steel material 1, and earth anchor 2
is suspended to the bottom of the hole.

次にトレミー管6を引き上げながらこれを通じて中空パ
イル3内にモルタル9を注入しく■)。
Next, while pulling up the tremie tube 6, pour the mortar 9 into the hollow pile 3 through it.

モルタル9を中空パイル3内に充てんして地中杭Aを形
成する(Vl)。アースアンカー2は根固め用モルタル
5の硬化と同時に孔底部Cに定着される。
The hollow pile 3 is filled with mortar 9 to form the underground pile A (Vl). The earth anchor 2 is fixed to the hole bottom C at the same time as the foot hardening mortar 5 hardens.

そしてアースアンカー2の定着後、地中杭Aの杭頭部に
構築される基礎7においてPC鋼材1を緊張し、この上
端を基礎7に定着する(■)。
After the earth anchor 2 is fixed, the PC steel material 1 is tensioned at the foundation 7 built on the head of the underground pile A, and its upper end is fixed to the foundation 7 (■).

第2図は掘削孔C内に中空パイル3.トレミー管6及び
PC鋼材1を挿入した状態を示したもので、第3図、第
4図、第5図はその上端部、中間部、下端部の詳細を示
している。
Figure 2 shows a hollow pile 3. This shows the state in which the tremie tube 6 and the PC steel material 1 are inserted, and FIGS. 3, 4, and 5 show details of the upper end, middle, and lower end.

第3図−■に示すように中空パイル3打ち込み後のやっ
とこ杭8上には主としてトレミー管6及びPC鋼材1の
位置決めのだめの架台10が設置される。この架台10
はモルタル9注入時にPC鋼材1がモルタル9によって
押し下げられるのを防ぐ役目も兼ねる。PC鋼材1は第
3図−■のようにトレミー管6の周囲に配置されるが、
架台10上のトレミー管6周囲にはPC鋼材1を吊るだ
めの楔11が取り付けられる。
As shown in FIG. 3-2, a frame 10 mainly for positioning the tremie pipe 6 and the PC steel material 1 is installed on the pinion pile 8 after the hollow pile 3 has been driven. This frame 10
also serves to prevent the PC steel material 1 from being pushed down by the mortar 9 when the mortar 9 is poured. The PC steel material 1 is placed around the tremie tube 6 as shown in Fig. 3-■,
A wedge 11 for suspending the PC steel material 1 is attached around the tremie tube 6 on the frame 10.

トレミー管6の外周には第4図に示すようにPC鋼材1
の位置決めのだめの位置決め用スペーサ12が取り付け
られておシ、■のようにそのPCC鋼材付位置設けた凹
みに外側からPC鋼材1を差し込むようにしである。■
はPC鋼材1を3本人れる場合であシ、Ili、IVは
それぞれ2本人れる場合、4本人れる場合を示している
As shown in FIG.
The positioning spacer 12 of the positioning pot is attached, and the PC steel material 1 is inserted from the outside into the recess provided in the position for attaching the PCC steel material, as shown in (2). ■
indicates the case where 3 people use the PC steel material 1, and Ili and IV show the cases where 2 people use the PC steel material 1 and 4 people use the PC steel material 1, respectively.

トレミー管6及びPC鋼材1の下端部には第5図に示す
ようにPC鋼材1を固定する固定用金物13が取り付け
られる。この固定用金物13の内側にはツメ13aが突
設されてお9、このツメ13aによシ固定用金物13は
トレミー管6に仮′固定されている。そして固定用金物
13はモルタル9注入開始後、トレミー管6を引き上げ
る際これを回転させてツメ13aを解くことによりトレ
ミー管6から切り離される。
A fixing hardware 13 for fixing the PC steel material 1 is attached to the lower ends of the tremie tube 6 and the PC steel material 1, as shown in FIG. A claw 13a is protruded from the inside of the fixing hardware 13, and the fixing hardware 13 is temporarily fixed to the tremie tube 6 by the claw 13a. After the mortar 9 starts pouring, the fixing hardware 13 is separated from the tremie tube 6 by rotating it and releasing the claws 13a when pulling up the tremie tube 6.

第5図においてPC鋼材1の下端はIのように固定用金
物13にパイプ状の固定端金物13b及4゜びU型ボル
ト13Cによって固定されており、またPC鋼材1下端
の下方には固定用金物13と支持層Bとの距離を確保す
るだめのスペーサ14が取り付けられている。本実施例
ではこのスペーサ14と固定用金物13とから孔底部C
に定着されるアースアンカー2を形成している。
In Fig. 5, the lower end of the PC steel material 1 is fixed to the fixing hardware 13 by a pipe-shaped fixed end hardware 13b and a 4° U-shaped bolt 13C as shown in I, and the lower end of the PC steel material 1 is fixed to the fixing hardware 13 as shown in I. A spacer 14 is attached to ensure a distance between the hardware 13 and the support layer B. In this embodiment, the spacer 14 and the fixing hardware 13 are connected to the hole bottom C.
It forms an earth anchor 2 fixed to.

スペーサ14にはストッパー14aが取シ付けられ、ス
トッパー14a下のスペーサ14が支持層B内に埋め込
まれることによって固定用金物13と支持層Bとの距離
を確保するようにしである。スペーサ14は支持層B内
に埋め込まれることによってトレミー管6の固定用金物
13からの解除を容易にしている。
A stopper 14a is attached to the spacer 14, and the spacer 14 below the stopper 14a is embedded in the support layer B to ensure a distance between the fixing hardware 13 and the support layer B. The spacer 14 is embedded in the support layer B to facilitate release of the tremie tube 6 from the fixing hardware 13.

(発明の効果) この発明は以上の通りであり、アースアンカーを地中杭
の先端に定着させてPC鋼材にプレストレスを導入する
ことによって杭に下向きの力が与えられるため構造物の
水圧等による浮上りを有効に防止することが可能となる
(Effects of the Invention) This invention is as described above, and by fixing an earth anchor to the tip of an underground pile and introducing prestress to the PC steel material, a downward force is applied to the pile, so that the water pressure of the structure etc. This makes it possible to effectively prevent floating due to

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

第1図は本発明の施工手順を示した概要図、第2図はモ
ルタル注入前の掘削孔内の様子を示した断面図であり、
第3図−I、]lは架台部分を示したそれぞれ正面図、
平面図、第4図−■はトレミー管中央部を示した正面図
、n、m、ivはその平面図、第5図−I、[は孔底部
を示したそれぞれ正面図、平面図である。 A:地中杭、B:支持層、C:掘削孔 C:孔底部、1:PC鋼材、2:アースアンカー3:中
空パイル、4:掘削機、5:モルタル6:トレミー管、
7二基礎、8:やっとこ杭9:モルタル、10:架台、
11:楔 12:位置決め用スペーサ、13:固定用金物13a:
ツメ、13b=固定端金物 13c:U型ボルト、14ニスペーサ 14a:ストッパー。 第3図 I        n       ■11図
Fig. 1 is a schematic diagram showing the construction procedure of the present invention, and Fig. 2 is a sectional view showing the inside of the excavation hole before mortar injection.
Figure 3-I, ]l is a front view showing the pedestal part, respectively;
A plan view, FIG. 4-■ is a front view showing the central part of the tremie tube, n, m, and iv are the plan views thereof, and FIG. . A: Underground pile, B: Support layer, C: Drilled hole C: Hole bottom, 1: PC steel, 2: Earth anchor 3: Hollow pile, 4: Excavator, 5: Mortar 6: Tremy pipe,
72 foundations, 8: Finally piles 9: Mortar, 10: Frame,
11: Wedge 12: Positioning spacer, 13: Fixing hardware 13a:
Claw, 13b = fixed end hardware 13c: U-shaped bolt, 14 varnish spacer 14a: stopper. Figure 3 I n ■Figure 11

Claims (1)

【特許請求の範囲】[Claims] (1)所定の支持層まで掘削して形成した掘削孔の孔底
部に根固め用のモルタルを注入し、モルタル硬化前に掘
削孔に中空パイル、トレミー管及び下端にアースアンカ
ーが接続されたPC鋼材を孔底部まで挿入し、トレミー
管を引き上げながらこれを通じて中空パイル内にモルタ
ルを注入し、充てんした後、アースアンカーを孔底部に
定着させてPC鋼材を緊張するアースアンカー兼用中空
パイルの施工方法。
(1) Mortar for foot protection is injected into the bottom of the drilled hole formed by excavating to a predetermined support layer, and before the mortar hardens, a hollow pile, a tremie pipe, and an earth anchor are connected to the lower end of the PC in the drilled hole. A method of constructing a hollow pile that also serves as an earth anchor, in which steel is inserted to the bottom of the hole, and mortar is injected into the hollow pile through it while pulling up the tremie pipe to fill it, and then an earth anchor is fixed at the bottom of the hole to tension the PC steel. .
JP17689986A 1986-07-28 1986-07-28 Construction of hollow pile serving also as earth anchor Granted JPS6332019A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17689986A JPS6332019A (en) 1986-07-28 1986-07-28 Construction of hollow pile serving also as earth anchor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17689986A JPS6332019A (en) 1986-07-28 1986-07-28 Construction of hollow pile serving also as earth anchor

Publications (2)

Publication Number Publication Date
JPS6332019A true JPS6332019A (en) 1988-02-10
JPH0355613B2 JPH0355613B2 (en) 1991-08-23

Family

ID=16021697

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17689986A Granted JPS6332019A (en) 1986-07-28 1986-07-28 Construction of hollow pile serving also as earth anchor

Country Status (1)

Country Link
JP (1) JPS6332019A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011184857A (en) * 2010-03-04 2011-09-22 Mitsubishi Materials Techno Corp Method for burying tube for underground heat exchange
CN103276725A (en) * 2013-06-06 2013-09-04 中铁一局集团有限公司 Construction structure and construction method of anchor pile for large-tonnage test pile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011184857A (en) * 2010-03-04 2011-09-22 Mitsubishi Materials Techno Corp Method for burying tube for underground heat exchange
CN103276725A (en) * 2013-06-06 2013-09-04 中铁一局集团有限公司 Construction structure and construction method of anchor pile for large-tonnage test pile

Also Published As

Publication number Publication date
JPH0355613B2 (en) 1991-08-23

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