JPS61207720A - Excavating device for pile hole for foundation pile - Google Patents
Excavating device for pile hole for foundation pileInfo
- Publication number
- JPS61207720A JPS61207720A JP4852885A JP4852885A JPS61207720A JP S61207720 A JPS61207720 A JP S61207720A JP 4852885 A JP4852885 A JP 4852885A JP 4852885 A JP4852885 A JP 4852885A JP S61207720 A JPS61207720 A JP S61207720A
- Authority
- JP
- Japan
- Prior art keywords
- pile
- screw
- excavation
- casing
- pile hole
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/28—Placing of hollow pipes or mould pipes by means arranged inside the piles or pipes
- E02D7/30—Placing of hollow pipes or mould pipes by means arranged inside the piles or pipes by driving cores
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
この発明は、基礎杭用杭孔掘削装置に関するもので、詳
しくは、各種建造物の築造用地の地盤を強化すべく、基
礎杭を地中に埋設するにあたって、同地中に杭孔を掘削
することを主目的とする杭孔掘削装置に関するものであ
る。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a pile hole drilling device for foundation piles. This relates to a pile hole drilling device whose main purpose is to drill a pile hole in the ground when burying the pile in the ground.
(従来の技術)
従来の杭孔掘削装置においては、アースオーガ等の掘削
機のリーダに昇降可能に配設した回転駆動装置に対し、
ロッド状の掘削軸の外周に掘削羽根が螺旋状に設けられ
た掘削用スクリューの上端部が懸吊状に装着されており
、掘削機の回転駆動装置を回転駆動させつつ下降させて
いくことにより、掘削用スクリューを掘削回転しながら
地中にm進させて、所定の深さの杭孔を掘削していた。(Prior art) In conventional pile hole drilling equipment, a rotary drive device, such as an earth auger, is installed on the leader of the excavator so as to be able to move up and down.
The upper end of the excavation screw, which has excavation blades spirally arranged around the outer periphery of a rod-shaped excavation shaft, is attached in a suspended manner. A pile hole of a predetermined depth was excavated by moving an excavation screw into the ground m while rotating the excavation screw.
そして、基礎杭の埋設にあたっては、前記掘削用スクリ
ューが杭孔より引抜いた上で、同杭孔に既製杭を送入す
るか、あるいは同杭孔に生コンクリートを投入して築造
杭を形成していた。When burying the foundation pile, the excavation screw is pulled out from the pile hole, and then a ready-made pile is delivered into the same pile hole, or ready-mixed concrete is poured into the same pile hole to form a built pile. was.
(発明が解決しようとする問題点)
したがって、上記した従来の杭孔掘削装置にあっては、
掘削用スクリューを杭孔より完全に引抜いた上で、杭孔
に対する基礎杭の埋設が行われるため、工数が多く、施
工作業が@雑となるという問題点があった。(Problems to be solved by the invention) Therefore, in the above-mentioned conventional pile hole drilling device,
Since the foundation pile is buried in the pile hole after the excavation screw is completely pulled out of the pile hole, there are problems in that the number of man-hours is large and the construction work is sloppy.
また、掘削用スクリューの引抜き後から基礎杭の埋設ま
での間において、杭孔の壁面が崩れたり、杭孔の底部が
崩れ土により穴埋めされたりすることがあった。このた
め、既製杭の挿入にあっては、その挿入が阻害されたり
、あるいは生コンクリートによる築造杭の築造にあって
は、築造杭が設計外の思わぬ形状となったり、同生コン
クリートに杭孔内に残存土砂が混入して強固な築造杭の
築造ができないという問題を生じた。Furthermore, during the period from the time the excavation screw is pulled out to the time the foundation pile is buried, the wall surface of the pile hole may collapse or the bottom of the pile hole may be filled with collapsed soil. For this reason, when inserting ready-made piles, the insertion may be obstructed, or when constructing piles using ready-mixed concrete, the piles may take an unexpected shape that is not designed for, or when piles are inserted into ready-made concrete. A problem arose in that residual earth and sand got mixed into the hole, making it impossible to construct strong construction piles.
(問題点を解決するための手段)
上記した従来の技術における問題点を解決するためのこ
の発明は、掘削機のリーダに昇降可能に配設された回転
駆動装置に掘削用スクリューが懸吊状に装着されてなる
基礎杭用杭孔掘削装置であって、しかも前記掘削用スク
リューは、円筒状をなすケーシングの外周に掘削羽根を
設けたスクリュー体と、ケーシングの下端開口部を閉塞
しうる掘削ヘッドとからなり、同掘削ヘッドをケーシン
グに離脱可能に装着せしめたことを構成の要旨とするも
のである。(Means for Solving the Problems) In order to solve the problems in the above-mentioned conventional techniques, the present invention is such that an excavation screw is suspended from a rotary drive device that is disposed on a leader of an excavator so that it can be raised and lowered. A pile hole drilling device for foundation piles, which is attached to a foundation pile, and the drilling screw includes a screw body having a drilling blade provided on the outer periphery of a cylindrical casing, and a drilling device capable of closing a lower end opening of the casing. The gist of the structure is that the excavation head is removably attached to the casing.
(作用)
上記した手段によれば、掘削用スクリューの掘削ヘッド
を杭孔の掘削後、スクリュー体のケーシングから離脱さ
せて、同スクリュー体のケーシングの下端を開口させる
ことにより、同ケーシングを既製杭の挿入あるいは生コ
ンクリートの投入の案内としての役割をもたせながら、
同掘削用スクリュー体が杭孔より引抜かれることにより
、杭孔に対する基礎杭(既製杭、築造杭等)の埋設が完
了される。(Function) According to the above-described means, after the excavation of the pile hole, the excavation head of the excavation screw is detached from the casing of the screw body, and the lower end of the casing of the screw body is opened, so that the casing can be attached to the ready-made pile. While serving as a guide for inserting concrete or pouring fresh concrete,
By pulling out the excavation screw body from the pile hole, embedding of foundation piles (ready-made piles, construction piles, etc.) in the pile hole is completed.
(実施例)
以下、この発明の一実施例を図面にしたがって説明する
。この説明にあたっては、杭孔掘削装置を側面で略示し
た第1図、要部を拡大して示した第2図および第3図に
基づいて進めていくことにする。(Example) An example of the present invention will be described below with reference to the drawings. In this explanation, we will proceed based on FIG. 1, which schematically shows a side view of the pile hole drilling device, and FIGS. 2 and 3, which show the main parts enlarged.
掘削機(例えば、アースオーガ)10に立設されかつ支
持柱11により傾動可能に支持されたリーダ12には、
周知のように、ワイヤ機構13を介して昇降される回転
駆動装置14が装備されている。回転駆動装置14の下
方に突出する回転軸15には、ジヨイント部材16の上
端に突出した連結軸17が適宜の結合手段により懸吊状
に結合されている。A leader 12 erected on an excavator (for example, an earth auger) 10 and tiltably supported by a support column 11 includes:
As is well known, a rotary drive device 14 is provided which is raised and lowered via a wire mechanism 13. A connecting shaft 17 projecting from the upper end of a joint member 16 is connected in a suspended manner to a rotating shaft 15 projecting downwardly of the rotary drive device 14 by an appropriate connecting means.
ジヨイント部材16は上面を閉塞した円筒状に形成され
ており、その下端部の外側には二枚の連結板18.18
が互いに相反する位置関係をもってそれぞれ固着されて
いる。連結板18.18の先端部(下端部)は、ジヨイ
ント部材16の下端よりも下方へ突出されている。The joint member 16 is formed into a cylindrical shape with a closed upper surface, and two connecting plates 18 and 18 are provided on the outside of the lower end thereof.
are fixed in mutually contradictory positional relationships. The leading end (lower end) of the connecting plate 18.18 projects further downward than the lower end of the joint member 16.
なお、ジヨイント部材16の連結軸17には、上部に一
つの入口と下部に二つの出口を有するほぼ逆T字状の流
通孔19が形成されている。この流通孔19の上部の入
口には、前記回転駆動装置14の回転軸15に開けられ
た流通孔(図示省略)と連通されている。回転駆動装@
14には回転軸15の流通孔へエア、水、セメントミル
ク等の流体を供・給しうる周知の流体供給機構(図示省
略)が装備されている。流通孔19の下部の両出口には
二本の流通パイプ20.20の各一端部がそれぞれ連通
されている。流通パイプ20.20はジヨイント部材1
6の上面および側面に沿って溶接等によりそれぞれ固着
され、その他端(下端)がジヨイント部材16の下端部
に位置されている。The connecting shaft 17 of the joint member 16 is formed with a substantially inverted T-shaped flow hole 19 having one inlet at the upper part and two outlets at the lower part. The upper entrance of the communication hole 19 communicates with a communication hole (not shown) formed in the rotation shaft 15 of the rotational drive device 14 . Rotary drive unit @
14 is equipped with a well-known fluid supply mechanism (not shown) capable of supplying fluid such as air, water, cement milk, etc. to the circulation hole of the rotating shaft 15. One end of each of two flow pipes 20 and 20 is communicated with both lower exits of the flow hole 19, respectively. Distribution pipe 20.20 is joint member 1
6 are fixed by welding or the like along the upper and side surfaces of the joint member 16, and the other end (lower end) is located at the lower end of the joint member 16.
両流通パイプ20.20は、前記連結板18.18間に
おいて互いに相反する位置関係をもって配置されている
。The two flow pipes 20.20 are arranged in opposite positions between the connecting plates 18.18.
ジヨイント部材16には掘削用スクリュー21が懸吊状
に装着されている。掘削用スクリュー21は、スクリュ
ー体22と掘削ヘッド23とからなる。まず、スクリュ
ー体22について第4図を参照して述べる。An excavating screw 21 is attached to the joint member 16 in a suspended manner. The drilling screw 21 includes a screw body 22 and a drilling head 23. First, the screw body 22 will be described with reference to FIG.
スクリュー体22は、円筒状をなすケーシング24の外
周に螺旋状の掘削羽根25が固着されてなる。ケーシン
グ24の上端部の外側には、平行状をなす一対の連結板
26.26が二組互いに相反する位置関係をもってそれ
ぞれ固着されている。The screw body 22 is made up of a cylindrical casing 24 and a spiral digging blade 25 fixed to the outer periphery of the casing 24 . A pair of parallel connecting plates 26, 26 are fixed to the outside of the upper end of the casing 24, respectively, with opposing positions.
そして、ケーシング24の各連結板26.26対の間に
前記ジヨイント部材16の連結板18が介入され、連結
板26.26対と連結板18とが連結ボルト27とナツ
ト28とにより締着されることによって、ジヨイント部
材16と掘削用スクリュー21のケーシング24とが一
連状に連結されている。なお、前記連結ボルト27とナ
ツト28に代えて、他のねじ止め手段、ビン止め手段等
による連結手段が採用されることもある。Then, the connecting plates 18 of the joint member 16 are interposed between each pair of connecting plates 26.26 of the casing 24, and the connecting plates 26.26 pairs and the connecting plates 18 are tightened with the connecting bolts 27 and nuts 28. By doing so, the joint member 16 and the casing 24 of the excavating screw 21 are connected in a continuous manner. Note that, instead of the connecting bolt 27 and nut 28, other connecting means such as screwing means, bolting means, etc. may be employed.
またケーシング24の外側には、二本の流下パイプ29
.29が互いに相反する位置関係をもって溶接等により
垂直状にそれぞれ固着されている。Additionally, two downstream pipes 29 are provided on the outside of the casing 24.
.. 29 are vertically fixed by welding or the like in mutually opposing positional relationships.
流下パイプ29.29の各上端は、前記ジヨイント部材
16とケーシング24との連結によって同ジヨイント部
材16の各流通パイプ20.20の下端にそれぞれ連通
されている。The upper ends of the downstream pipes 29 and 29 are connected to the lower ends of the flow pipes 20 and 20 of the joint member 16 through the connection between the joint member 16 and the casing 24, respectively.
また、スクリュー体22のケーシング24の下端部の外
側には、二個の係合部材30.30が互いに相反する位
置関係をもって固着されている。Further, two engaging members 30 and 30 are fixed to the outer side of the lower end portion of the casing 24 of the screw body 22 with mutually opposing positional relationships.
係合部材30.30の各先端部(下端部)は、ケーシン
グ24の下端よりも下方へ突出されるとともに、掘削回
転方向に指向して傾斜されている。Each tip portion (lower end portion) of the engaging member 30.30 projects downward from the lower end of the casing 24 and is inclined toward the excavation rotation direction.
なお、本例では掘削羽根25が右ねじ状をなしているの
で、掘削回転方向は平面において右回り方向であるから
、係合部材30.30の下端部は側方から見て左下がり
傾斜状をなしている。In this example, since the excavation blade 25 has a right-handed screw shape, the excavation rotation direction is clockwise in the plane, so the lower end of the engaging member 30. is doing.
各係合部材30.,30には、上端に前記各流下パイプ
29.29の下端がそれぞれ連通された噴出孔31が設
けられている。噴出孔31の下端開口部は係合部材30
.30の傾斜方向とほぼ同じ方向に指向されている。Each engaging member 30. , 30 are provided with jet holes 31 at their upper ends, with which the lower ends of each of the downstream pipes 29, 29 are communicated, respectively. The lower end opening of the jet hole 31 is connected to the engaging member 30.
.. It is oriented in substantially the same direction as the inclination direction of 30.
次に、掘削ヘッド23について第5図を参照して述べる
。掘削ヘッド23は、円板状の閉止板32の下面に角柱
状の掘削歯33.33を突出してなる。閉止板32の外
端部には二つの係合溝34゜34が互いに相反する位置
関係をもって凹設されている。そして、掘削ヘッド23
の両係合溝34゜34が前記スクリュー体22の係合部
材30,30の各下端部に係合されることによって、同
スクリュー体22のケーシング24の下端開口部が開基
されている。なお掘削ヘッド23は、スクリュー体22
の上昇と、掘削回転方向とは反対方向への回転とによる
相対的な位置ずれによる係合部材30.30と係合溝3
4.34との係合関係の解除によって、同スクリュー体
22から離脱可能となっている。Next, the excavation head 23 will be described with reference to FIG. The excavation head 23 has prismatic excavation teeth 33, 33 protruding from the lower surface of a disc-shaped closing plate 32. Two engaging grooves 34.degree. 34 are formed in the outer end of the closing plate 32 in opposite positions. And the drilling head 23
By engaging the lower end portions of the engaging members 30, 30 of the screw body 22, the lower end opening of the casing 24 of the screw body 22 is opened. Note that the drilling head 23 has a screw body 22
The engagement member 30.30 and the engagement groove 3 due to relative positional deviation due to the rise of
By releasing the engagement relationship with 4.34, it can be detached from the screw body 22.
引続いて、上記した杭孔掘削装置を使用して基礎杭を埋
設する工法の代表的な三工法について、順次述べること
にする。Next, three representative construction methods for burying foundation piles using the above-mentioned pile hole drilling equipment will be sequentially described.
(第1工法)
第1工法は、既製杭PAを地中Eに埋設する工法であっ
て、第6図イ〜ホを参照しながら説明する。(First construction method) The first construction method is a method of burying ready-made piles PA in the ground E, and will be explained with reference to FIGS. 6A to 6E.
まず、掘削機10の回転駆動装置14を回転駆動させつ
つ下降させることにより、掘削用スクリュー21が掘削
回転されながら地中Eに掘進される。このとき、掘削用
スクリュー21の掘削ヘッド23の掘削歯33.33お
よびスクリュー体22の係合部材30.30の下端部は
、地中Eを掘り下げていき、排土はスクリュー体22の
掘削羽根25により地上へ排出される。そして、上記し
た掘削は杭孔Hが所定の深さに達するまで行われる(第
6図イ参照)。なお、この掘削にあたっては、適宜掘削
機10の流体供給機構よりエア、水等が流通パイプ20
.20および流下パイプ29゜29を主体とする流体供
給経路に供給され、係合部材30.30の噴出孔31.
31より噴射され、掘削の進行が助長される。First, by rotating and lowering the rotary drive device 14 of the excavator 10, the excavating screw 21 is excavated into the ground E while being rotated. At this time, the excavation teeth 33.33 of the excavation head 23 of the excavation screw 21 and the lower end of the engagement member 30.30 of the screw body 22 dig into the underground E, and the soil is removed by the excavation blades of the screw body 22. 25 and is discharged to the ground. The above-mentioned excavation is continued until the pile hole H reaches a predetermined depth (see FIG. 6A). Note that during this excavation, air, water, etc. are supplied to the distribution pipe 20 from the fluid supply mechanism of the excavator 10 as appropriate.
.. 20 and the downstream pipe 29. The fluid is supplied to a fluid supply path mainly consisting of the downstream pipe 29.
31 to promote the progress of excavation.
次に、ジヨイント部材16と掘削用スクリュー21とを
連結している連結ボルト27およびナツト28を取外し
て、掘削用スクリュー21を杭孔1−11.:残したま
ま、同掘削用スクリュー21からジヨイント部材16を
分離して、掘削用スクリュー21のケーシング24の上
端開口部を開口する。Next, the connecting bolt 27 and nut 28 connecting the joint member 16 and the excavation screw 21 are removed, and the excavation screw 21 is inserted into the pile hole 1-11. : Separate the joint member 16 from the excavation screw 21 while leaving it in place, and open the upper end opening of the casing 24 of the excavation screw 21.
そして、同ケーシング24内にその上端開口部よりクレ
ーン等の懸吊ワイヤWに懸吊された既製杭PAを挿入す
る(同図口参照)。なお、既製杭PAには、コンクリー
トパイル、鋼管、木杭等の各種の材質からなるもの使用
することが可能であると共に、その形状も、管状、円形
断面、三角断面、四角断面、H字断面、T7断面、凹凸
断面等の各種の形状のものが使用可能である。Then, a ready-made pile PA suspended from a suspension wire W of a crane or the like is inserted into the casing 24 from the upper end opening (see the opening in the figure). In addition, ready-made piles PA can be made of various materials such as concrete piles, steel pipes, and wooden piles, and their shapes can also be tubular, circular cross section, triangular cross section, square cross section, H-shaped cross section. , T7 cross section, uneven cross section, etc. can be used.
次に、再び掘削用スクリュー21にジヨイント部材16
を連結ボルト27およびナツト28により、掘削時の状
態に連結させた後、回転駆動装置14によりスクリュー
体22を逆転させながら上管させる。これによって、ス
クリュー体22と掘削ヘッド23との係合が外れ、同掘
削ヘッド23が杭孔Hの底部に残される。そして、流通
パイプ20.20および流下パイプ29.29を主体と
する流体供給経路を介して係合部材30..30の噴出
孔31.31より、セメントミルクが適宜噴射され、杭
孔Hの底部に掘削ヘッド23および既製杭PAの下端部
を取巻く球根部Gが形成される(同図ハ参照)。Next, attach the joint member 16 to the excavation screw 21 again.
After the screw body 22 is connected with the connecting bolt 27 and the nut 28 in the excavation state, the screw body 22 is rotated in the reverse direction by the rotary drive device 14 and the screw body 22 is moved into the upper pipe. As a result, the screw body 22 and the excavation head 23 are disengaged, and the excavation head 23 is left at the bottom of the pile hole H. Then, the engaging member 30. .. Cement milk is appropriately injected from the spout holes 31.31 of 30, and a bulbous portion G surrounding the excavation head 23 and the lower end of the ready-made pile PA is formed at the bottom of the pile hole H (see FIG. 3C).
その後、回転駆動装置14によりスクリュー体22を逆
転させながら上昇させていく。このとき、同スクリュー
体22の逆転を利用して、土砂Mを地上から杭孔Hに降
送しかつ同土砂Mを既製杭PAの周辺に圧縮させていく
(同図二参照)。Thereafter, the screw body 22 is raised while being reversed by the rotary drive device 14. At this time, by utilizing the reverse rotation of the screw body 22, the earth and sand M is lowered from the ground to the pile hole H, and the earth and sand M is compressed around the ready-made pile PA (see FIG. 2).
このようにして、スクリュー体22が順次上昇されてい
き、杭孔Hから完全に引抜かれることによって、杭孔H
に対する既製杭PAの埋設が完了される(同図ホ参照)
。In this way, the screw body 22 is raised one after another and is completely pulled out from the pile hole H.
Burying of ready-made piles PA is completed (see figure E).
.
なお、スクリュー体22の上昇の途中において、土砂M
の降送を中断し、前記球根部Gの形成と同様にしてセメ
ントミルクを既製杭PAの周辺部に打設すれば(第7図
イ参照)、既製杭PAの途中に適宜の中間球根部Qaを
形成することができる(第7図口参照)
また既製杭PAは、スクリュー体22のケーシング24
内に予め挿入した上で、掘削ヘッド23を同ケーシング
24に装着し、この状態で杭孔ト1の掘削を行うことも
できる(第8図参照)。In addition, during the upward movement of the screw body 22, the earth and sand M
If the conveyance of the cement milk is interrupted and cement milk is poured around the ready-made pile PA in the same manner as in the formation of the above-mentioned bulb part G (see Fig. 7A), an appropriate intermediate bulb part will be formed in the middle of the ready-made pile PA. In addition, the ready-made pile PA can be formed with the casing 24 of the screw body 22 (see Figure 7).
After the excavation head 23 is inserted into the casing 24 in advance, the excavation head 23 can be attached to the casing 24, and the pile hole 1 can be excavated in this state (see FIG. 8).
(第2工法)
第2工法は、生コンクリートCを地中Eに投入して築造
杭PBを形成する工法であって、第9図イ〜ハを参照し
ながら説明する。(Second construction method) The second construction method is a construction method in which fresh concrete C is poured into the ground E to form construction piles PB, and will be explained with reference to FIGS.
まず、前記第1工法と同様にして、所定の深さの杭孔H
を掘削しく第6図イ参照)、さらに、掘削用スクリュー
21を杭孔Hに残したまま、同掘削用スクリュー21か
らジヨイント部材16を分離した後、同ケーシング24
内にその上端開口部より鉄筋Rを配筋する。なお、この
鉄筋Rはケーシング24内に鋼線材を順次配筋しても、
また予め鋼線材を骨組み状に構成したものを挿入しても
よい。First, in the same manner as the first construction method, a pile hole H of a predetermined depth is
(see Figure 6 A), and after separating the joint member 16 from the drilling screw 21 while leaving the drilling screw 21 in the pile hole H, remove the casing 24.
Reinforcing bars R are placed inside from the upper end opening. Note that even if the reinforcing bars R are sequentially arranged with steel wire rods inside the casing 24,
Alternatively, a steel wire rod constructed in advance into a skeleton shape may be inserted.
そして、同ケーシング24内にその上端開口部より生コ
ンクリートCを充填する。Then, fresh concrete C is filled into the casing 24 from its upper opening.
次に、再び前記第1の工法と同様に、掘削用スクリュー
21にジヨイント部材16を連結させた後、スクリュー
体22を逆転させながら上昇させると共に、前記流体供
給経路を介してセメントミルクが杭孔1」の底部に送入
され、掘削ヘッド23および鉄筋Rの下端部を取巻(球
根部Gが形成される(第9図イ参照)。Next, similarly to the first construction method, after connecting the joint member 16 to the excavation screw 21, the screw body 22 is raised while being reversed, and cement milk is poured into the pile hole through the fluid supply path. 1'', and surrounds the excavation head 23 and the lower end of the reinforcing bar R (a bulbous portion G is formed (see FIG. 9A)).
その後、前記第1の工法と同様に、回転駆動装置14に
よりスクリュー体22を逆転させながら上昇させていく
と共に、同スクリュー体22の逆転を利用して、土砂M
を地上から杭孔ト)に降送しかつ同土砂Mを生コンクリ
ートCの周辺に圧縮させていく(同図口参照)。Thereafter, similarly to the first construction method, the screw body 22 is raised while being reversed by the rotary drive device 14, and the earth and sand M
The soil M is sent down from the ground to the pile hole (G), and the same soil M is compressed around the ready-mixed concrete C (see the opening in the figure).
このようにして、スクリュー体22が順次上昇されてい
き、杭孔Hから完全に引抜かれることによって、杭孔H
に対する築造杭P8の埋設が完了する(同図ハ参照)。In this way, the screw body 22 is raised one after another and is completely pulled out from the pile hole H.
The burying of the construction pile P8 is completed (see C in the same figure).
なお、この工法においても、前記第1工法と同様に、ス
クリュー体22の上昇の途中において、土砂Mの降送を
中断し、前記球根部Gの形成と同様にしてセメントミル
クを既製杭PAの周辺部に打設すれば(第10図口参照
)、既製杭PAの途中に適宜の中間球根部Gaを形成す
ることができる(第10図口参照)。In addition, in this construction method, as in the first construction method, the descending of the earth and sand M is interrupted during the upward movement of the screw body 22, and cement milk is poured into the ready-made pile PA in the same manner as in the formation of the bulb portion G. If it is driven in the peripheral area (see the opening in Figure 10), an appropriate intermediate bulbous portion Ga can be formed in the middle of the ready-made pile PA (see the opening in Figure 10).
(第3工法)
第3工法は、分割杭PC1,PC2を地中Eに埋設して
一本の半築造杭PCを形成する工法であって、第11図
イおよび口を参照しながら説明する。(Third construction method) The third construction method is a construction method in which divided piles PC1 and PC2 are buried in the ground E to form one semi-constructed pile PC, and will be explained with reference to Figure 11 A and the opening. .
まず、前記第1工法と同様にして、所定の深さの杭孔H
1−1!耐しく第6図イ参照)、さらに、掘削用スクリ
ュー21を杭孔Hに残したまま、同掘削用スクリュー2
1からジヨイント部材16を分離した後、同ケーシング
24内にその上端開口部より分割杭PC1を挿入する。First, in the same manner as the first construction method, a pile hole H of a predetermined depth is
1-1! (see Figure 6 A), and further, while leaving the drilling screw 21 in the pile hole H, remove the same drilling screw 2.
After separating the joint member 16 from the casing 1, the split pile PC1 is inserted into the casing 24 from its upper end opening.
次に、再び前記第1の工法と同様に、掘削用スクリユー
21にジヨイント部材16を連結させた後、スクリュー
体22を逆転させながら上昇させると共に、前記流体供
給経路を介してセメントミルクが杭孔ト1の底部に送入
され、掘削ヘッド23および鉄筋Rの下端部を取巻く球
根部Gが形成される。さらに回転駆動装置14によりス
クリュー体22を逆転させながら上昇させていくと共に
、同スクリュー体22の逆転を利用して、土砂Mを地上
から杭孔Hに降送しかつ同土砂Mを分割杭PC1の周辺
に圧縮させていく(第11図イ参照)。Next, similarly to the first construction method, after connecting the joint member 16 to the excavation screw 21, the screw body 22 is raised while being reversed, and cement milk is poured into the pile hole through the fluid supply path. The bulbous portion G surrounding the excavation head 23 and the lower end of the reinforcing bar R is formed. Furthermore, the screw body 22 is raised while being reversed by the rotary drive device 14, and by utilizing the reverse rotation of the screw body 22, the earth and sand M is lowered from the ground to the pile hole H, and the earth and sand M is transferred to the divided pile PC1. (See Figure 11A).
そして、分割杭PCIの上端部に達したならば、一旦ス
クリユ一体22の逆転および上昇を停止する。その後、
再び掘削用スクリュー21を杭孔Hに残したまま、同掘
削用スクリュー21からジヨイント部材16を分離した
後、同ケーシング24内にその上端開口部より連結用鉄
筋Raを挿入する(同図イにおける二点鎖線参照)と共
に、同鉄筋Rを取巻くように生コンクリートを投入し、
中閤球根部Gaを形成する。さらに同ケーシング24内
にその上端開口部より分割杭PC2を挿入した後、再び
掘削用スクリュー21にジヨイント部材16を連結させ
た後、回転駆動装置14によりスクリュー体22を逆転
させながら上昇させていくと共に、同スクリュー体22
の逆転を利用して、土砂Mを地上から杭孔Hに降送しか
つ同土砂Mを分割杭PC2の周辺に圧縮させていき、ス
クリュー体22が杭孔Hから完全に引抜かれることによ
って、杭孔Hに対する半築造杭PCの埋設が完了する(
同図口参照)。When the upper end of the divided pile PCI is reached, the reverse rotation and upward movement of the screw unit 22 are temporarily stopped. after that,
After separating the joint member 16 from the excavating screw 21 while leaving the excavating screw 21 in the pile hole H again, the connecting reinforcing bar Ra is inserted into the casing 24 from the upper end opening (as shown in A in the figure). (See the two-dot chain line), and pour ready-mixed concrete so as to surround the reinforcing bar R.
A middle bulb part Ga is formed. Furthermore, after inserting the divided pile PC2 into the casing 24 from the upper end opening, and after connecting the joint member 16 to the excavation screw 21 again, the screw body 22 is raised while being reversed by the rotary drive device 14. In addition, the same screw body 22
By utilizing the reversal of the earth and sand M from the ground to the pile hole H and compressing the earth and sand M around the divided pile PC2, the screw body 22 is completely pulled out from the pile hole H. The burying of the semi-constructed pile PC in the pile hole H is completed (
(See the beginning of the figure).
なお、上記した各工法は代表例であって、これに限定さ
れるものではなく、基礎杭の埋設場所の地質に応じて適
宜変更されるものである。また、基礎杭の材質、形状、
球根部G、Gaの有無、土砂Mの圧縮の有無等も基礎杭
の埋設場所の地質に応じて適宜設定されるものである。The construction methods described above are representative examples and are not limited to these, and may be changed as appropriate depending on the geology of the location where the foundation pile is buried. In addition, the material, shape,
The presence or absence of the bulb portion G, Ga, and the presence or absence of compaction of the earth and sand M are also appropriately set according to the geology of the place where the foundation pile is buried.
以下、上記実施例に基づいて予測される技術的手段につ
いて列記することにする。Hereinafter, technical means predicted based on the above embodiments will be listed.
(イ)上記した実施例における掘削ヘッド23の係合溝
34.34を、第12図に示すような角孔状の係合孔3
4a、34aとすること。(a) The engagement grooves 34 and 34 of the excavation head 23 in the above-described embodiment are replaced with square engagement holes 34 and 34 as shown in FIG.
4a, 34a.
(ロ)第13図および第14図に示すように、スクリュ
ー体22の各係合部材30.30をほぼし字状に形成し
、掘削ヘッド23の閉止板32の上面に係合孔36.3
6をもつ係合突起35.35を形成し゛、同係合部材3
0.30が係合突起35゜35の係合孔36.36に対
しスクリュー体22の正逆回転より係脱可能となすこと
。なお第13図および第14図では、掘削ヘッド23の
閉止板32の下面には四本の掘削歯33〜33が突出さ
れていると共に、中央の二本よりも外側の二本の掘削歯
33.33が若干短く形成されている。(B) As shown in FIGS. 13 and 14, each of the engaging members 30, 30 of the screw body 22 is formed in a substantially L-shape, and the engaging holes 36, 30 are formed in the upper surface of the closing plate 32 of the excavating head 23. 3
The engaging member 3 is formed with an engaging protrusion 35.
0.30 to be able to engage and disengage from the engagement hole 36.36 of the engagement protrusion 35°35 by forward and reverse rotation of the screw body 22. In addition, in FIGS. 13 and 14, four digging teeth 33 to 33 are projected from the lower surface of the closing plate 32 of the drilling head 23, and two digging teeth 33 on the outside of the two in the center are shown. .33 is formed slightly shorter.
(ハ)第15図および第16図に示すように、スクリュ
ー体22の各係合部材30.30を単なる突片状に形成
し、掘削ヘッド23の閉止板32の上面に逆り字形の係
合突起35a、35aを形成し、同係合部材30.30
が係合突起35a〜35aに対しスクリュー体22の正
逆回転より係脱可能となすこと。(c) As shown in FIGS. 15 and 16, each engaging member 30, 30 of the screw body 22 is formed into a mere projecting piece shape, and engages in an inverted shape on the upper surface of the closing plate 32 of the excavating head 23. Forming the mating protrusions 35a, 35a, the engaging member 30.30
can be engaged with and disengaged from the engagement protrusions 35a to 35a by forward and reverse rotation of the screw body 22.
(ニ)掘削ヘッド23の掘削61133〜33を尖鋭状
に形成すること。例えば、第17図に示すように、前記
(ロ)項における掘削ヘッド23の掘削歯33〜33を
、掘削ヘッド23の外側を低くし中央寄りを高くするテ
ーパ状に形成すること。(d) Forming the excavations 61133 to 33 of the excavation head 23 into a sharp shape. For example, as shown in FIG. 17, the excavating teeth 33 to 33 of the excavating head 23 in the above item (b) are formed in a tapered shape in which the outer side of the excavating head 23 is lowered and the center side is higher.
(ホ)掘削ヘッド23の閉止板32の下面にベースを設
け、同ベースの下側面に掘削歯33〜33を突出するこ
と。例えば、第18図および第19図に示すように、前
記(ハ)項における掘削ヘッド23の閉止板32の下面
にほぼ円錐状のベース37を設け、同ベース37の下側
のテーバ面38 ゛に掘削6M133〜33を突
出すること。(E) A base is provided on the lower surface of the closing plate 32 of the excavation head 23, and the excavation teeth 33 to 33 are protruded from the lower surface of the base. For example, as shown in FIGS. 18 and 19, a substantially conical base 37 is provided on the lower surface of the closing plate 32 of the excavation head 23 in the above item (c), and a tapered surface 38 on the lower side of the base 37 is provided. To project excavation 6M133-33.
(へ)11削ヘツド23に予め既製杭PAを一体的に固
着すること。例えば、第20図に示ずように、前記(ホ
)項における掘削ヘッド23の閉止板32上に予め既製
杭PAを一体的に固着して、掘削ヘッド付き既製杭PD
とするすること。なお、この掘削ヘッド付き既製杭PD
を使用する工法については後述する。(f) 11. A ready-made pile PA is integrally fixed to the cutting head 23 in advance. For example, as shown in FIG. 20, the ready-made pile PA is integrally fixed on the closing plate 32 of the excavation head 23 in the above item (e), and the ready-made pile PD with the excavation head is attached.
To do. In addition, this ready-made pile PD with excavation head
The construction method using this will be described later.
(ト)第21図に示すように、スクリュー体22の掘削
羽根25の一部を排除して、その部位のケーシング24
の外側に、第22図に示すような断面はぼ半円状の上押
え部材39〜39を固着すること。仔の上押え部材39
〜39は、スクリュー体22の回転時において杭孔Hの
壁面を押えつけることによって、同壁面の土崩れを防止
するに有効である。(g) As shown in FIG. 21, a part of the excavation blade 25 of the screw body 22 is removed and the casing 24
Upper pressing members 39 to 39 having a substantially semicircular cross section as shown in FIG. 22 are fixed to the outside of the holder. Child upper presser member 39
- 39 is effective in preventing landslides on the wall surface of the pile hole H by pressing down on the wall surface of the pile hole H when the screw body 22 rotates.
(チ)前記(ト)項の上押え部材39〜39を、第23
図に示すような板状の上押え部材398〜39aとする
こと。なお、この上押え部vJ39a〜39aは、同図
に示すようにスクリュー体22の掘削回転方向く図中矢
印参照)とは反対の方向へ傾斜状に固着することが望ま
しい。(H) The upper pressing members 39 to 39 of the item (G) above are connected to the 23rd
The upper pressing members 398 to 39a are plate-shaped as shown in the figure. Note that, as shown in the figure, it is desirable that the upper holding parts vJ39a to 39a be fixed in an inclined manner in a direction opposite to the excavation rotational direction of the screw body 22 (see arrows in the figure).
(す)第24図に示すように、掘削機10の回転駆動装
置14として回転1rd15〜15を複数本備えたもの
を使用し、各回転軸15〜15にそれぞれジヨイント部
材16〜16を介して掘削用スクリュー21〜21を懸
吊状に装着すること。この杭孔掘削装置によれば、複数
の杭孔H−Hを第25図に示すように連続状に掘削する
ことができ、これによって連壁状をなす基礎杭の埋設を
効率良く行うことが可能である。(S) As shown in FIG. 24, the rotary drive device 14 of the excavator 10 is equipped with a plurality of rotary shafts 15 to 15, and each rotary shaft 15 to 15 is connected to the rotary drive device 14 through joint members 16 to 16, respectively. The excavating screws 21 to 21 are installed in a suspended manner. According to this pile hole drilling device, a plurality of pile holes H-H can be continuously excavated as shown in Fig. 25, and thereby foundation piles forming a continuous wall can be buried efficiently. It is possible.
(ヌ)流通パイプ20.20および流下バイブ29.2
9を主体とする流体供給経路は、必要に応じて装備され
るものであって、本発明の技術的範囲を限定するもので
はないこと。(nu) Distribution pipe 20.20 and downstream vibe 29.2
The fluid supply path mainly indicated by 9 is provided as necessary and does not limit the technical scope of the present invention.
なお、前記(へ)における掘削ヘッド付き既製杭PDを
使用する工法の一例を第27図を参照して併記しておく
と、まず、掘削ヘッド付き既製杭PDの既製杭PAをス
クリュー体22のケーシング24内にその下端開口部よ
り予め挿入した上で、掘削ヘッド23を同ケーシング2
4に係合し、この状態で前記第1工法と同様にして、所
定の深さの杭孔Hを掘削する(第27図イ参照)。その
後、スクリュー体22を逆転させながら上昇させると共
に、前記流体供給経路を介してセメントミルクを杭孔H
の底部に送入し、WA¥15ヘッド付き既製杭PDの下
端部を取巻く球根部Gを形成しく同図口参照)、さらに
回転駆動装置14によりスクリュー体22を逆転させな
がら上昇させていくと共に、同スクリュー体22の逆転
を利用してミ土砂Mを地上から杭孔Hに降送しかつ同土
砂Mを既製杭PAの周辺に圧縮させていき(同図ハ参照
)、スクリュー体22が杭孔Hから完全に引抜かれるこ
とによって、杭孔Hに対する掘削ヘッド付き既製杭PD
の埋設が完了する(同図二参照)。An example of the construction method using the ready-made pile PD with a digging head in (f) above is also described with reference to FIG. After inserting the excavation head 23 into the casing 24 from the lower end opening in advance,
4, and in this state, a pile hole H of a predetermined depth is excavated in the same manner as in the first construction method (see Fig. 27A). Thereafter, the screw body 22 is raised while being reversed, and cement milk is supplied to the pile hole H through the fluid supply path.
Then, the screw body 22 is raised while rotating in the reverse direction by the rotary drive device 14. Using the reverse rotation of the screw body 22, the earth and sand M is sent from the ground to the pile hole H, and the earth and sand M is compressed around the ready-made pile PA (see C in the figure), and the screw body 22 By being completely pulled out from the pile hole H, the ready-made pile PD with the drilling head for the pile hole H
burial has been completed (see Figure 2).
この工法においても前記工法と同様に、スクリュー体2
2の上昇の途中において、土砂Mの降送を中断し、前記
球根部Gの形成と同様にしてセメントミルクを既製杭P
Aの周辺部に打設すれば(第27図イ参照)、既製杭P
Aの途中に適宜の中間球根部Gaを形成することができ
る(同図口参照)。In this construction method as well, the screw body 2
In the middle of the ascent of step 2, the dropping of the earth and sand M is interrupted, and cement milk is poured into the ready-made pile P in the same manner as in the formation of the bulbous portion G.
If it is driven around the area of A (see Figure 27 A), the ready-made pile P
An appropriate intermediate bulbous portion Ga can be formed in the middle of A (see the opening in the figure).
(発明の効果)
すなわち、この発明は前述した「問題点を解決するため
の手段」の欄に記載した構成を要旨となし、掘削用スク
リューの掘削ヘッドを杭孔の掘削後、スクリュー体のケ
ーシングから離脱させて、同スクリュー体のケーシング
の下端を開口させることにより、同ケーシングを既製杭
の挿入あるいは生コンクリートの投入の案内としての役
割をもたせながら、同掘削用スクリュー体が杭孔より引
抜かれることにより、杭孔に対する基礎杭(既製杭、築
造杭等)の埋設が完了されるものであるから、従来の杭
孔に対する基礎杭の埋設にあたって掘削用スクリューを
杭孔より完全に引抜(必要のあった杭孔掘削装置に比し
、工数の少ない作業によって基礎杭のj!I!設を行う
ことができ、施工作業が簡素化されるという効果がある
。(Effects of the Invention) That is, the gist of the present invention is the configuration described in the above-mentioned "Means for Solving Problems" column, and after the excavation head of the excavation screw is excavated into the pile hole, the casing of the screw body is By separating it from the screw body and opening the lower end of the casing of the screw body, the excavation screw body is pulled out from the pile hole while the casing serves as a guide for inserting ready-made piles or pouring fresh concrete. By doing this, the burying of foundation piles (ready-made piles, constructed piles, etc.) in the pile hole is completed. Therefore, when burying the foundation pile in the conventional pile hole, the drilling screw must be completely pulled out from the pile hole (as required). Compared to existing pile hole drilling equipment, foundation piles can be installed with fewer man-hours, and the construction work is simplified.
また、従来生じた掘削用スクリューの引抜き後から基礎
杭の埋設までの間における杭孔の壁面の崩れおよび穴埋
めという不具合を解消することができ、杭孔に対する既
製杭の挿入にあっては円滑かつ適正な挿入が行え、また
杭孔に対する生コンクリートによる築造抗の築造にあっ
ては生コンクリートの投入および鉄筋の配筋も円滑かつ
適正に行え、優れた強度をもつ基礎杭の埋設を行えると
いう効果を期持し得る。In addition, it is possible to eliminate the conventional problem of collapse of the wall of the pile hole and filling of the hole between the time the excavation screw is pulled out and the foundation pile is buried, and the insertion of ready-made piles into the pile hole is smooth and smooth. The effect is that proper insertion can be carried out, and when constructing a construction shaft with ready-mixed concrete in a pile hole, the introduction of ready-mixed concrete and the arrangement of reinforcing bars can be carried out smoothly and appropriately, and foundation piles with excellent strength can be buried. can be expected.
また、本発明の杭孔掘削装置によれば、基礎杭の埋設場
所の地質に対応した幅広い各種の工法を適宜採用するこ
とができ、この点からも各種の基礎工事を合理的に行え
る。Further, according to the pile hole drilling device of the present invention, a wide variety of construction methods can be appropriately adopted depending on the geology of the place where the foundation pile is buried, and from this point of view as well, various foundation works can be carried out rationally.
図面はこの発明の一実施例を示すもので、第1図は杭孔
掘削装置の側面図、第2図は要部側面図、第3図は要部
正面図、第4図はスクリュー体の側面図、第5図は掘削
ヘッドの平面図、第6図イ〜ホは第1工法に係る説明図
、第7図イおよび口は第1工法による中間球根部の形成
に係る説明図、第8図は第1工法の変更例を示す説明図
、第9図イ〜ハは第2工法に係る説明図、第10図イお
よび口は第2工法による中間球根部の形成に係る説明図
、第11図イおよび口は第3工法に係る説明図、第12
図は掘削ヘッドの別例の平面図、第13図はスクリュー
体と掘削ヘッドとの係合手段の別例を示す側面図、第1
4図は同正面図、第15図はスクリュー体と掘削ヘッド
との係合手段の他の別例を示す側面図、第16図は同正
面図、第17図は掘削ヘッドの掘削歯の別例を示す側面
図、第18図は掘削ヘッドの他の別例を示す側面図、第
19図は同正面図、第20図は掘削ヘッド付き既製杭の
一例を示す側面図、第21図はスクリュー体の別例を示
す側面図、第22図は土押え板の断面図、第23図は土
押え板の別例を示す断面図、第24図は掘削機の回転駆
動装置に複数本の掘削用スクリューを連設した状態の略
示正面図、第25図は同掘削機による杭孔の形成状態を
示す説明平面図、第26図イル二は掘削ヘッド付き既製
杭を使用した工法に係る説明図、第27図イおよび口は
同工法による中間球根部の形成に係る説明図である。
10・・・掘削機 12・・・リーダ14・・・
回転駆動装r121・・・掘削用スクリュー22・・・
スクリュー体 23・・・掘削ヘッド24・・・ケーシ
ング 25・・・掘削羽根出 願 人 西 森
輝 喜代 理 人 弁理士 岡田英彦(外2名
)(イン (・) (イ)第
16 饋 箭16 図図面その4
(ロン
1図
竿17 図The drawings show one embodiment of the present invention, and Fig. 1 is a side view of the pile hole drilling equipment, Fig. 2 is a side view of the main part, Fig. 3 is a front view of the main part, and Fig. 4 is a diagram of the screw body. 5 is a plan view of the excavation head; FIGS. 6A to 6E are explanatory diagrams related to the first construction method; FIGS. 8 is an explanatory diagram showing a modification of the first construction method, FIGS. 9A to 9C are explanatory diagrams related to the second construction method, and FIG. Figure 11 A and Figure 11 are explanatory diagrams related to the third construction method, Figure 12
The figure is a plan view of another example of the excavation head, FIG. 13 is a side view showing another example of the engagement means between the screw body and the excavation head, and FIG.
FIG. 4 is a front view of the same, FIG. 15 is a side view showing another example of the engagement means between the screw body and the drilling head, FIG. 16 is a front view of the same, and FIG. 17 is another example of the digging teeth of the drilling head. FIG. 18 is a side view showing another example of the excavation head, FIG. 19 is a front view thereof, FIG. 20 is a side view showing an example of a ready-made pile with an excavation head, and FIG. 21 is a side view showing another example of the excavation head. A side view showing another example of the screw body, FIG. 22 is a sectional view of the earth retaining plate, FIG. 23 is a sectional view showing another example of the earth retaining plate, and FIG. Fig. 25 is an explanatory plan view showing how a pile hole is formed by the excavator, and Fig. 26 shows a construction method using ready-made piles with a drilling head. Explanatory drawings and FIG. 27A and 27B are explanatory drawings relating to the formation of the intermediate bulb portion by the same construction method. 10... Excavator 12... Leader 14...
Rotation drive device r121...Drilling screw 22...
Screw body 23...Drilling head 24...Casing 25...Drilling blade Applicant Teru Nishimori Kiyo Attorney Patent attorney Hidehiko Okada (2 others) (In (・) (A) No. 16 Figure drawing part 4 (Ron 1 figure rod 17 figure
Claims (1)
掘削用スクリューが懸吊状に装着されてなる基礎杭用杭
孔掘削装置であって、しかも前記掘削用スクリューは、
円筒状をなすケーシングの外周に掘削羽根を設けたスク
リュー体と、ケーシングの下端開口部を閉塞しうる掘削
ヘッドとからなり、同掘削ヘッドをケーシングに離脱可
能に装着せしめたことを特徴とする杭孔掘削装置。A pile hole drilling device for foundation piles, in which a drilling screw is attached in a suspended manner to a rotary drive device that is disposed on a leader of the drilling machine so as to be able to rise and fall, and the drilling screw comprises:
A pile consisting of a screw body with excavation blades provided on the outer periphery of a cylindrical casing, and an excavation head capable of closing the opening at the lower end of the casing, and the excavation head is removably attached to the casing. Hole drilling equipment.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4852885A JPS61207720A (en) | 1985-03-12 | 1985-03-12 | Excavating device for pile hole for foundation pile |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4852885A JPS61207720A (en) | 1985-03-12 | 1985-03-12 | Excavating device for pile hole for foundation pile |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61207720A true JPS61207720A (en) | 1986-09-16 |
Family
ID=12805858
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4852885A Pending JPS61207720A (en) | 1985-03-12 | 1985-03-12 | Excavating device for pile hole for foundation pile |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61207720A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55155823A (en) * | 1979-05-22 | 1980-12-04 | Marugo Kiso Kogyo Kk | Burying method for pile |
-
1985
- 1985-03-12 JP JP4852885A patent/JPS61207720A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55155823A (en) * | 1979-05-22 | 1980-12-04 | Marugo Kiso Kogyo Kk | Burying method for pile |
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