JP6392808B2 - Method and apparatus for extracting buried pile - Google Patents

Method and apparatus for extracting buried pile Download PDF

Info

Publication number
JP6392808B2
JP6392808B2 JP2016097693A JP2016097693A JP6392808B2 JP 6392808 B2 JP6392808 B2 JP 6392808B2 JP 2016097693 A JP2016097693 A JP 2016097693A JP 2016097693 A JP2016097693 A JP 2016097693A JP 6392808 B2 JP6392808 B2 JP 6392808B2
Authority
JP
Japan
Prior art keywords
wire
buried pile
casing
excavation
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.)
Active
Application number
JP2016097693A
Other languages
Japanese (ja)
Other versions
JP2017206814A (en
Inventor
敦雄 土屋
敦雄 土屋
貴昭 吉田
貴昭 吉田
Original Assignee
太洋基礎工業株式会社
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 太洋基礎工業株式会社 filed Critical 太洋基礎工業株式会社
Priority to JP2016097693A priority Critical patent/JP6392808B2/en
Publication of JP2017206814A publication Critical patent/JP2017206814A/en
Application granted granted Critical
Publication of JP6392808B2 publication Critical patent/JP6392808B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Description

本発明は、地盤中に埋設してある埋設杭を簡単かつ確実に引き抜くことのできる埋設杭の引き抜き方法及びその装置に関するものである。   The present invention relates to an embedded pile extraction method and apparatus capable of easily and reliably extracting an embedded pile embedded in the ground.

従来から地盤１８に埋設された埋設杭１０を引き抜くには、図４（ａ）（ｂ）（ｃ）に示すような工法で行われていた（引用文献１）。
（１）地盤１８に埋設されている埋設杭１０の位置を確認し、埋設杭１０の周りに泥水等を噴射し、バックホウによりケーシング１１を回転して埋設杭１０の外周に掘削穴１５を掘削する。
（２）掘削穴１５が埋設杭１０の下端部まで掘削して埋設杭１０と掘削穴１５の内壁面との接触を切る。
（３）ケーシング１１の下端部の掘削刃１２は、１枚おきに内外に傾斜させてあってその間に空間１３が形成されている。図４（ｃ）に示すように、ワイヤー１４は、リング１６を貫通して環状部１７が形成されており、この環状部１７が図４（ａ）（ｂ）に示すように、掘削刃１２の空間１３に嵌め込まれている。
（４）ケーシング１１を埋設杭１０の下端部よりやや上まで引き上げ、ワイヤー１４を吊っているクレーンを緩めてワイヤー１４の環状部１７を自重とワイヤー１４の剛性によりケーシング１１から外し、ワイヤー１４をクレーンで引き上げて埋設杭１０の下端部に環状部１７を締め付ける。
（５）ワイヤー１４の環状部１７を埋設杭１０の下端部に締め付け、この状態を保持しつつワイヤー１４をクレーンで引き上げることにより埋設杭１０を引き抜く。 Conventionally, the buried pile 10 buried in the ground 18 has been extracted by a construction method as shown in FIGS. 4A, 4B, and 4C (Cited document 1).
(1) The position of the buried pile 10 buried in the ground 18 is confirmed, muddy water or the like is injected around the buried pile 10, the casing 11 is rotated by the backhoe, and the excavation hole 15 is excavated on the outer periphery of the buried pile 10. To do.
(2) The excavation hole 15 excavates to the lower end of the buried pile 10 to cut the contact between the buried pile 10 and the inner wall surface of the excavation hole 15.
(3) Excavation blades 12 at the lower end of the casing 11 are inclined inward and outward every other sheet, and a space 13 is formed therebetween. As shown in FIG. 4 (c), the wire 14 penetrates the ring 16 to form an annular portion 17, and the annular portion 17 is formed as shown in FIGS. 4 (a) and 4 (b). It is inserted into the space 13.
(4) Pull the casing 11 up slightly from the lower end of the buried pile 10, loosen the crane that suspends the wire 14, remove the annular portion 17 of the wire 14 from the casing 11 due to its own weight and the rigidity of the wire 14, and The annular portion 17 is fastened to the lower end portion of the buried pile 10 by lifting with a crane.
(5) The annular portion 17 of the wire 14 is fastened to the lower end portion of the buried pile 10 and the buried pile 10 is pulled out by pulling up the wire 14 with a crane while maintaining this state.

特公平２−１９３０号公報Japanese Patent Publication No.2-1930

特許文献１に示す公報によれば、ワイヤー１４を埋設杭１０の下端部近くに締め付ける際、ケーシング１１は泥水等を噴射させながら埋設するので、埋設杭１０と掘削穴１５の内壁との間がある程度の間隔でどろどろの軟弱土になっており、ケーシング１１を一旦少し持ち上げるとワイヤー１４は自重とワイヤー１４の剛性で簡単に外れ、ケーシング１１をワイヤー１４の固定したいところでとどめておき、その後ワイヤー１４をクレーンで引くとワイヤー１４はケーシング１１の先端にぶつかり、それ以上あがらないので埋設杭１０に締め付けることができる、としている。
しかし、この工法では、ワイヤー１４は、内外に傾斜させて形成された掘削刃１２の空間１３に嵌め込んでおり、この状態で地盤１８を掘削すると、ワイヤー１４が土石に回転しながら接触して破損してしまう恐れがあり、また、掘削刃１２で地盤１８を掘削しているときに掘削刃１２とワイヤー１４との間に土石が挟まってしまい、地盤１８が泥水でどろどろになったとしてもケーシング１１を持ち上げてもワイヤー１４は自重とワイヤー１４の剛性で外れることがなく、しかも、地中でワイヤー１４がケーシング１１の掘削刃１２から外れたかどうかを確認することもできないという問題があった。 According to the gazette shown in Patent Document 1, when the wire 14 is tightened near the lower end portion of the buried pile 10, the casing 11 is buried while injecting muddy water or the like, so the gap between the buried pile 10 and the inner wall of the excavation hole 15 is between. It becomes mud and soft soil at a certain interval, and once the casing 11 is lifted up a little, the wire 14 easily comes off due to its own weight and the rigidity of the wire 14, and the casing 11 is kept where the wire 14 is fixed, and then the wire 14 When the wire 14 is pulled by a crane, the wire 14 hits the tip of the casing 11 and does not rise any further, so that it can be fastened to the buried pile 10.
However, in this construction method, the wire 14 is fitted into the space 13 of the excavating blade 12 formed so as to be inclined inward and outward, and when the ground 18 is excavated in this state, the wire 14 comes into contact with the earth and stone while rotating. There is a risk of damage, and even when the ground 18 is being excavated with the excavating blade 12, a debris is caught between the excavating blade 12 and the wire 14, and the ground 18 becomes muddy with muddy water. Even if the casing 11 is lifted, there is a problem that the wire 14 does not come off due to its own weight and the rigidity of the wire 14, and it is impossible to check whether the wire 14 has come off the excavating blade 12 of the casing 11 in the ground. .

本発明は、地盤をケーシングで掘削する際に泥水等の噴射にかかわりなく、確実にワイヤーをケーシングから外して埋設杭に巻き付けて埋設杭を簡単かつ確実に引き抜くことのできる埋設杭の引き抜き方法及びその装置を提供することを目的とするものである。   The present invention relates to a method for pulling a buried pile that can easily and reliably pull out a buried pile by reliably detaching the wire from the casing and winding it around the buried pile when excavating the ground with the casing. The object is to provide such a device.

本発明による埋設杭の引き抜き方法は、埋設杭２０の周りに掘削用ケーシング２１の掘削刃２２で引き抜き穴３３を掘削し、前記埋設杭２０の先端部にワイヤー２３の環状部３１を巻きつけて重機３４によりワイヤー２３とともに埋設杭２０を引き抜くようにした埋設杭の引き抜き方法において、
前記掘削用ケーシング２１の先端部のやや上部の内壁面に設けたワイヤー収納部２５に、前記環状部３１を収納し仮止めする工程と、
前記埋設杭２０の周りに前記掘削用ケーシング２１で引き抜き穴３３を掘削する工程と、
前記ワイヤー２３を地上の重機３４で引き揚げ、前記ワイヤー収納部２５に収納された環状部３１の仮止めを外してこの環状部３１を前記埋設杭２０の先端部に巻きつける工程と、
前記ワイヤー２３を地上の重機３４の引っ張りにより埋設杭２０を引き抜く工程と
からなる。 In the method of pulling out the buried pile according to the present invention, a drawing hole 33 is excavated around the buried pile 20 with the excavating blade 22 of the excavating casing 21, and the annular portion 31 of the wire 23 is wound around the tip of the buried pile 20. In the method of pulling out the buried pile 20 with which the heavy machine 34 pulls out the buried pile 20 together with the wire 23,
Storing and temporarily fixing the annular portion 31 in the wire storage portion 25 provided on the inner wall surface slightly above the tip of the excavating casing 21;
A step of excavating an extraction hole 33 around the buried pile 20 in the excavation casing 21;
The step of lifting the wire 23 with a heavy machine 34 on the ground, removing the temporary fixing of the annular portion 31 accommodated in the wire accommodating portion 25 and winding the annular portion 31 around the tip of the buried pile 20;
The wire 23 is pulled out by a heavy machine 34 on the ground, and the buried pile 20 is pulled out.

前記ワイヤー２３を地上の重機３４で引っ張りにより埋設杭２０を引き抜く工程は、前記掘削用ケーシング２１を地上に引き抜いた後に行うようにしてもよく、また、 前記ワイヤー２３を地上の重機３４で引っ張りにより埋設杭２０を引き抜く工程と、前記掘削用ケーシング２１を地上に引き抜く工程とを同時に行うようにしてもよい。   The step of pulling out the buried pile 20 by pulling the wire 23 with the heavy machine 34 on the ground may be performed after the casing 21 for excavation is pulled out to the ground, and the wire 23 is pulled by the heavy machine 34 on the ground. The step of pulling out the buried pile 20 and the step of pulling out the excavating casing 21 to the ground may be performed simultaneously.

前記ワイヤー２３は、重機３４から前記環状部３１に至る直線部３６を掘削用ケーシング２１の外壁面に沿って案内することが望ましい。   The wire 23 desirably guides the straight portion 36 extending from the heavy machine 34 to the annular portion 31 along the outer wall surface of the excavating casing 21.

埋設杭２０の周りに掘削用ケーシング２１の掘削刃２２で引き抜き穴３３を掘削し、前記埋設杭２０の先端部にワイヤー２３の環状部３１を巻きつけて重機３４によりワイヤー２３とともに埋設杭２０を引き抜くための埋設杭の引き抜き装置において、
前記掘削用ケーシング２１は、先端部のやや上部の内壁部に、前記ワイヤー２３の環状部３１を収納するワイヤー収納部２５を全周囲が内方に開口するようにして設け、このワイヤー収納部２５に、収納した環状部３１がこのワイヤー収納部２５から突出するのを防止する仮支持材２７を所定間隔で設け、前記掘削用ケーシング２１の外周面に前記ワイヤー２３の直線部を案内するワイヤーガイド溝２４を設け、このワイヤーガイド溝２４の下端部と前記ワイヤー収納部２５の間に前記ワイヤー２３の連通するワイヤー逃げ切欠き２６を設ける。 An excavation hole 33 is excavated around the buried pile 20 with the excavating blade 22 of the excavating casing 21, the annular portion 31 of the wire 23 is wound around the tip of the buried pile 20, and the buried pile 20 is attached together with the wire 23 by the heavy machine 34. In the extraction device for buried piles for extraction,
The casing 21 for excavation is provided on a slightly upper inner wall portion of the tip portion with a wire storage portion 25 for storing the annular portion 31 of the wire 23 so that the entire circumference opens inward. In addition, provisional support members 27 for preventing the stored annular portion 31 from protruding from the wire storage portion 25 are provided at predetermined intervals, and a wire guide for guiding the straight portion of the wire 23 to the outer peripheral surface of the excavation casing 21. A groove 24 is provided, and a wire relief notch 26 through which the wire 23 communicates is provided between the lower end portion of the wire guide groove 24 and the wire storage portion 25.

前記ワイヤー収納部２５は、内側が開口した断面コ字形をなし、外側面に、所定間隔でワイヤー逃げ切欠き２６を形成し、このワイヤー逃げ切欠き２６に臨ませて前記仮支持材２７を保持する固定部材２９を設ける。   The wire storage portion 25 has a U-shaped cross section with an inner opening, and has a wire escape notch 26 formed on the outer surface at predetermined intervals, and holds the temporary support member 27 facing the wire escape notch 26. A fixing member 29 is provided.

請求項１記載の発明によれば、埋設杭の周りに掘削用ケーシングの掘削刃で引き抜き穴を掘削し、前記埋設杭の先端部にワイヤーの環状部を巻きつけて重機によりワイヤーとともに埋設杭を引き抜くようにした埋設杭の引き抜き方法において、
前記掘削用ケーシングの先端部のやや上部の内壁面に設けたワイヤー収納部に、前記環状部を収納し仮止めする工程と、
前記埋設杭の周りに前記掘削用ケーシングで引き抜き穴を掘削する工程と、
前記ワイヤーを地上の重機で引き揚げ、前記ワイヤー収納部に収納された環状部の仮止めを外してこの環状部を前記埋設杭の先端部に巻きつける工程と、
前記ワイヤーを地上の重機の引っ張りにより埋設杭を引き抜く工程と
からなるので、次の効果を有する。
・掘削用ケーシングの掘削刃で引き抜き穴を掘削しても、ワイヤーの環状部がワイヤー収納部に収納され仮止めされているので、ワイヤーが土石に接触して破損することがない。
・掘削刃で地盤を掘削しているときに掘削刃とワイヤーとの間に土石が挟まることがないので、掘削の際に地盤を泥水でどろどろにしなくても確実にワイヤー収納部から外れて埋設杭に巻きつけることができる。 According to the first aspect of the present invention, the excavation hole is excavated around the buried pile with the excavating blade of the excavating casing, the annular portion of the wire is wound around the tip of the buried pile, and the buried pile is attached together with the wire by a heavy machine. In the method of pulling out buried piles that have been pulled out,
A step of storing and temporarily fixing the annular portion in a wire storage portion provided on an inner wall surface slightly above the tip of the excavation casing;
Drilling a pull hole in the excavation casing around the buried pile;
Hoisting the wire with heavy machinery on the ground, removing the temporary fixing of the annular portion stored in the wire storage portion, and winding the annular portion around the tip of the buried pile;
Since the wire comprises a step of pulling out the buried pile by pulling heavy machinery on the ground, the following effects are obtained.
-Even if the extraction hole is excavated with the excavating blade of the excavating casing, the annular portion of the wire is accommodated and temporarily fixed in the wire accommodating portion, so that the wire does not come into contact with the debris and is not damaged.
・ When excavating the ground with the excavating blade, there will be no debris between the excavating blade and the wire, so that the ground will surely come out of the wire storage section without being muddy with the muddy water. Can be wrapped around a pile.

請求項２記載の発明によれば、前記ワイヤーを地上の重機で引っ張りにより埋設杭を引き抜く工程は、前記掘削用ケーシングを地上に引き抜いた後に行うようにしたので、掘削用ケーシングを引き上げてもワイヤーが上昇することがないときには、環状部で埋設杭を強く締めつけており、また、掘削用ケーシングとワイヤーが同時に上昇しているときは、環状部で埋設杭を強く締めつけていないことが分かる。   According to the second aspect of the present invention, the step of pulling out the buried pile by pulling the wire with a heavy machine on the ground is performed after the casing for excavation is pulled out to the ground. It can be seen that the buried pile is strongly tightened at the annular portion when the lift does not rise, and the buried pile is not firmly tightened at the annular portion when the casing for excavation and the wire are raised simultaneously.

請求項３記載の発明によれば、前記ワイヤーを地上の重機で引っ張りにより埋設杭を引き抜く工程は、埋設杭前記掘削用ケーシングを地上に引き抜く工程と同時に行うようにすることにより、作業工程時間の短縮が図れる。   According to the invention of claim 3, the step of pulling the buried pile by pulling the wire with a heavy machine on the ground is performed simultaneously with the step of pulling the buried pile and the casing for excavation to the ground. It can be shortened.

請求項４記載の発明によれば、前記ワイヤーは、重機から前記環状部に至る直線部を掘削用ケーシングの外壁面に沿って案内したので、掘削用ケーシングによる引き抜き穴の掘削が支障なく行える。   According to the fourth aspect of the invention, the wire guides the straight portion from the heavy machinery to the annular portion along the outer wall surface of the excavation casing, so that the excavation hole can be excavated without any trouble.

請求項５記載の発明によれば、埋設杭の周りに掘削用ケーシングの掘削刃で引き抜き穴を掘削し、前記埋設杭の先端部にワイヤーの環状部を巻きつけて重機によりワイヤーとともに埋設杭を引き抜くための埋設杭の引き抜き装置において、
前記掘削用ケーシングは、先端部のやや上部の内壁部に、前記ワイヤーの環状部を収納するワイヤー収納部を全周囲が内方に開口するようにして設け、このワイヤー収納部に、収納した環状部がこのワイヤー収納部から突出するのを防止する仮支持材を所定間隔で設け、前記掘削用ケーシングの外周面に前記ワイヤーの直線部を案内するワイヤーガイド溝を設け、このワイヤーガイド溝の下端部と前記ワイヤー収納部の間に前記ワイヤーの連通するワイヤー逃げ切欠きを設けたので、次の効果を有する。
・掘削用ケーシングの掘削刃で引き抜き穴を掘削しても、ワイヤーの環状部がワイヤー収納部に収納され仮止めされているので、ワイヤーが土石に接触して破損することがない。
・掘削刃で地盤を掘削しているときに掘削刃とワイヤーとの間に土石が挟まることがないので、掘削の際に地盤を泥水でどろどろにしなくても確実にワイヤー収納部から外れて埋設杭に巻きつけることができる。 According to the invention described in claim 5, the excavation hole is excavated around the buried pile with the excavating blade of the excavating casing, the annular portion of the wire is wound around the tip of the buried pile, and the buried pile is put together with the wire by a heavy machine. In the extraction device for buried piles for extraction,
The casing for excavation is provided on the inner wall part slightly above the tip part so that a wire storage part for storing the annular part of the wire is opened inward, and the annular part stored in the wire storage part. Provisional support members for preventing the portion from protruding from the wire storage portion are provided at predetermined intervals, a wire guide groove for guiding the straight portion of the wire is provided on the outer peripheral surface of the excavation casing, and a lower end of the wire guide groove Since the wire escape notch through which the wire communicates is provided between the portion and the wire storage portion, the following effects are obtained.
-Even if the extraction hole is excavated with the excavating blade of the excavating casing, the annular portion of the wire is accommodated and temporarily fixed in the wire accommodating portion, so that the wire does not come into contact with the debris and is not damaged.
・ When excavating the ground with the excavating blade, there will be no debris between the excavating blade and the wire, so that the ground will surely come out of the wire storage section without being muddy with the muddy water. Can be wrapped around a pile.

請求項６記載の発明によれば、前記ワイヤー収納部は、内側が開口した断面コ字形をなし、外側面に、所定間隔でワイヤー逃げ切欠きを形成し、このワイヤー逃げ切欠きに臨ませて前記仮支持材を保持する固定部材を設けたので、ワイヤーをワイヤー収納部に掘削用ケーシングの外側から容易に仮保持できる。   According to the invention of claim 6, the wire housing portion has a U-shaped cross section with an inner opening, and wire escape notches are formed at predetermined intervals on the outer surface, and the wire escape notches are exposed to the wire escape notches. Since the fixing member for holding the temporary support member is provided, the wire can be temporarily held in the wire storage portion from the outside of the excavation casing.

本発明による埋設杭の引き抜き方法及びその装置の実施例１を示すもので、（ａ）は、掘削用ケーシングの先端部の縦断面図、（ｂ）は、掘削用ケーシングの底面図、（ｃ）は、（ａ）のＡ部の拡大断面図である。BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows an embodiment 1 of a buried pile drawing method and apparatus according to the present invention, in which (a) is a longitudinal sectional view of a tip portion of an excavating casing, (b) is a bottom view of the excavating casing, () Is an expanded sectional view of the A section of (a). 本発明による埋設杭の引き抜き方法及びその装置の引き抜き工程を示すもので、（ａ）は、掘削用ケーシング２１で埋設杭２０の周りに引き抜き穴３３を掘削する工程の説明図、（ｂ）は、掘削用ケーシング２１を少し引き上げ、ワイヤー２３の環状部３１を埋設杭２０に巻き付ける工程の説明図、（ｃ）は、掘削用ケーシング２１だけを引き上げる工程の説明図、（ｄ）は、埋設杭２０を引き抜いている工程の説明図である。The drawing method of the buried pile by this invention and the drawing process of the apparatus are shown, (a) is explanatory drawing of the process of excavating the extraction hole 33 around the buried pile 20 with the excavation casing 21, (b) An explanatory diagram of the process of pulling up the excavating casing 21 a little and winding the annular portion 31 of the wire 23 around the buried pile 20, (c) is an explanatory diagram of a process of pulling up only the excavating casing 21, and (d) is an embedded pile. It is explanatory drawing of the process which has pulled 20 out. 本発明による埋設杭の引き抜き方法及びその装置を示すもので、埋設杭２０にワイヤー２３を巻き付ける状態の斜視図である。FIG. 2 is a perspective view of a state in which a wire 23 is wound around the buried pile 20, showing a method and apparatus for pulling the buried pile according to the present invention. 特許文献１に記載の従来の埋設杭の引き抜き装置を示すもので、（ａ）は、ケーシング１１の先端の断面図、（ｂ）は、（ａ）の底面図、（ｃ）は、ワイヤー１４の斜視図である。1 shows a conventional buried pile pulling device described in Patent Document 1, wherein (a) is a sectional view of the tip of the casing 11, (b) is a bottom view of (a), and (c) is a wire 14; FIG.

本発明は、埋設杭２０の周りに掘削用ケーシング２１の掘削刃２２で引き抜き穴３３を掘削し、前記埋設杭２０の先端部にワイヤー２３の環状部３１を巻きつけて重機３４によりワイヤー２３とともに埋設杭２０を引き抜くようにした埋設杭の引き抜き方法において、
前記掘削用ケーシング２１の先端部のやや上部の内壁面に設けたワイヤー収納部２５に、前記環状部３１を収納し仮止めする工程と、
前記埋設杭２０の周りに前記掘削用ケーシング２１で引き抜き穴３３を掘削する工程と、
前記ワイヤー２３を地上の重機３４で引き揚げ、前記ワイヤー収納部２５に収納された環状部３１の仮止めを外してこの環状部３１を前記埋設杭２０の先端部に巻きつける工程と、
前記ワイヤー２３を地上の重機３４の引っ張りにより埋設杭２０を引き抜く工程と
からなる。 In the present invention, a pulling hole 33 is excavated around the buried pile 20 with the excavating blade 22 of the excavating casing 21, and the annular portion 31 of the wire 23 is wound around the distal end portion of the buried pile 20 together with the wire 23 by the heavy machine 34. In the method of pulling out the buried pile that is designed to pull out the buried pile 20,
Storing and temporarily fixing the annular portion 31 in the wire storage portion 25 provided on the inner wall surface slightly above the tip of the excavating casing 21;
A step of excavating an extraction hole 33 around the buried pile 20 in the excavation casing 21;
The step of lifting the wire 23 with a heavy machine 34 on the ground, removing the temporary fixing of the annular portion 31 accommodated in the wire accommodating portion 25 and winding the annular portion 31 around the tip of the buried pile 20;
The wire 23 is pulled out by a heavy machine 34 on the ground, and the buried pile 20 is pulled out.

前記ワイヤー２３を地上の重機３４で引っ張りにより埋設杭２０を引き抜く工程は、前記掘削用ケーシング２１を地上に引き抜いた後に行うようにしてもよく、また、 前記ワイヤー２３を地上の重機３４で引っ張りにより埋設杭２０を引き抜く工程と、埋設杭２０前記掘削用ケーシング２１を地上に引き抜く工程とを同時に行うようにしてもよい。   The step of pulling out the buried pile 20 by pulling the wire 23 with the heavy machine 34 on the ground may be performed after the casing 21 for excavation is pulled out to the ground, and the wire 23 is pulled by the heavy machine 34 on the ground. The process of pulling out the buried pile 20 and the process of pulling out the excavating casing 21 to the ground may be performed simultaneously.

前記ワイヤー２３は、重機３４から前記環状部３１に至る直線部３６を掘削用ケーシング２１の外壁面に沿って案内することにより、掘削用ケーシング２１による引き抜き穴３３の掘削が支障なく行える。   The wire 23 guides the straight portion 36 extending from the heavy machine 34 to the annular portion 31 along the outer wall surface of the excavation casing 21, so that the extraction hole 33 can be excavated by the excavation casing 21 without any trouble.

埋設杭２０の周りに掘削用ケーシング２１の掘削刃２２で引き抜き穴３３を掘削し、前記埋設杭２０の先端部にワイヤー２３の環状部３１を巻きつけて重機３４によりワイヤー２３とともに埋設杭２０を引き抜くための埋設杭の引き抜き装置において、
前記掘削用ケーシング２１は、先端部のやや上部の内壁部に、前記ワイヤー２３の環状部３１を収納するワイヤー収納部２５を全周囲が内方に開口するようにして設け、このワイヤー収納部２５に、収納した環状部３１がこのワイヤー収納部２５から突出するのを防止する仮支持材２７を所定間隔で設け、前記掘削用ケーシング２１の外周面に前記ワイヤー２３の直線部を案内するワイヤーガイド溝２４を設け、このワイヤーガイド溝２４の下端部と前記ワイヤー収納部２５の間に前記ワイヤー２３の連通するワイヤー逃げ切欠き２６を設ける。 An excavation hole 33 is excavated around the buried pile 20 with the excavating blade 22 of the excavating casing 21, the annular portion 31 of the wire 23 is wound around the tip of the buried pile 20, and the buried pile 20 is attached together with the wire 23 by the heavy machine 34. In the extraction device for buried piles for extraction,
The casing 21 for excavation is provided on a slightly upper inner wall portion of the tip portion with a wire storage portion 25 for storing the annular portion 31 of the wire 23 so that the entire circumference opens inward. In addition, provisional support members 27 for preventing the stored annular portion 31 from protruding from the wire storage portion 25 are provided at predetermined intervals, and a wire guide for guiding the straight portion of the wire 23 to the outer peripheral surface of the excavation casing 21. A groove 24 is provided, and a wire relief notch 26 through which the wire 23 communicates is provided between the lower end portion of the wire guide groove 24 and the wire storage portion 25.

前記ワイヤー収納部２５は、内側が開口した断面コ字形をなし、外側面に、所定間隔でワイヤー逃げ切欠き２６を形成し、このワイヤー逃げ切欠き２６に臨ませて前記仮支持材２７を保持する固定部材２９を設ける。   The wire storage portion 25 has a U-shaped cross section with an inner opening, and has a wire escape notch 26 formed on the outer surface at predetermined intervals, and holds the temporary support member 27 facing the wire escape notch 26. A fixing member 29 is provided.

以下、本発明による埋設杭の引き抜き方法及びその装置の実施例１を図１乃至図３に基づき説明する。
埋設杭２０は、地盤３２に埋設されており、この埋設杭２０を引き抜くものとする。掘削用ケーシング２１は、前記埋設杭２０を引き抜くために、この埋設杭２０の周りに引き抜き穴３３を掘削するための掘削用ケーシング２１である。この掘削用ケーシング２１は、埋設杭２０が直径３００ｍｍ程度までであれば、直径７００ｍｍ、長さ１０００ｍｍ、肉厚９ｍｍ程度の金属製円筒体３５を主体とし、この円筒体３５は、埋設杭２０の長さに応じて順次連結される。 Hereinafter, Embodiment 1 of the method and apparatus for pulling out an embedded pile according to the present invention will be described with reference to FIGS.
The buried pile 20 is buried in the ground 32, and this buried pile 20 is pulled out. The excavation casing 21 is an excavation casing 21 for excavating a drawing hole 33 around the buried pile 20 in order to pull out the buried pile 20. The excavating casing 21 is mainly composed of a metal cylinder 35 having a diameter of 700 mm, a length of 1000 mm, and a thickness of about 9 mm if the buried pile 20 has a diameter of about 300 mm. It is sequentially connected according to the length.

前記掘削用ケーシング２１の金属製円筒体３５の先端部には、所定の間隔で掘削刃２２が取り付けられている。この掘削刃２２が取り付けられた掘削用ケーシング２１には、この掘削刃２２の取り付け位置のやや上方に位置して内壁側が開口した断面コ字形のワイヤー収納部２５が外方に膨出し、かつ、全周囲に連続して設けられている。このワイヤー収納部２５の外周壁面には、所定間隔で結び窓２８が開口し、この結び窓２８に臨ませた内部には、固定部材２９が設けられている。   Excavation blades 22 are attached to the tip of the metal cylinder 35 of the excavation casing 21 at predetermined intervals. In the excavating casing 21 to which the excavating blade 22 is attached, a U-shaped wire storage portion 25 having an inner wall side opened slightly above the attaching position of the excavating blade 22 bulges outward, and It is continuously provided all around. A knot window 28 is opened at a predetermined interval on the outer peripheral wall surface of the wire storage portion 25, and a fixing member 29 is provided inside the knot window 28.

前記掘削用ケーシング２１の円筒部３５の外側面には、縦方向にワイヤー２３の直線部３６を案内するワイヤーガイド溝２４が形成されている。前記ワイヤー２３は、図３に示すように、直線部３６の先端部にリング３０が設けられ、このリング３０にリング３０を通し、２重輪の環状部３１が形成される。このように形成されたワイヤー２３の環状部３１は、前記ワイヤー収納部２５の内側から収納され、この環状部３１部分が内方に突出しないように仮支持材２７によって固定部材２９に仮止めされる。仮止めされている状態では、環状部３１は、円筒部３５の内側に飛び出さない。前記ワイヤー２３の直線部３６の上端部は、クレーン等の重機３４に連結される。
なお、前記環状部３１は、図４（ｃ）に示すように１輪のものであってもよい。 A wire guide groove 24 for guiding the straight portion 36 of the wire 23 in the vertical direction is formed on the outer surface of the cylindrical portion 35 of the excavating casing 21. As shown in FIG. 3, the wire 23 is provided with a ring 30 at the front end portion of the straight portion 36, and the ring 30 is passed through the ring 30 to form a double ring annular portion 31. The annular portion 31 of the wire 23 thus formed is accommodated from the inside of the wire accommodating portion 25, and is temporarily fixed to the fixing member 29 by the temporary support member 27 so that the annular portion 31 portion does not protrude inward. The In the temporarily fixed state, the annular portion 31 does not jump out to the inside of the cylindrical portion 35. The upper end portion of the straight portion 36 of the wire 23 is connected to a heavy machine 34 such as a crane.
The annular portion 31 may be a single wheel as shown in FIG.

前記ワイヤー２３の直線部３６のワイヤーガイド溝２４に案内されている部分は、外側へはみ出さないように、所定間隔で仮支持材２７により仮止めされる。このワイヤー２３の直線部３６がワイヤーガイド溝２４からワイヤー収納部２５へ導入される部分のワイヤー収納部２５の上面から円筒部３５の側面の一部に連続するワイヤー逃げ切欠き２６が形成される。同様に、ワイヤー収納部２５の下面から円筒部３５の先端部までに連続するワイヤー逃げ切欠き２６が形成される。   A portion of the linear portion 36 of the wire 23 guided by the wire guide groove 24 is temporarily fixed by a temporary support member 27 at a predetermined interval so as not to protrude outward. A wire escape notch 26 is formed which is continuous from the upper surface of the wire housing portion 25 where the linear portion 36 of the wire 23 is introduced into the wire housing portion 25 from the wire guide groove 24 to a part of the side surface of the cylindrical portion 35. . Similarly, a continuous wire escape notch 26 is formed from the lower surface of the wire storage portion 25 to the tip of the cylindrical portion 35.

以上のような構成による作用を図２に基づき説明する。
図２（ａ）
地盤３２に埋設された埋設杭２０の位置を確認し、この埋設杭２０の周りを掘削用ケーシング２１の回転により掘削刃２２で引き抜き穴３３を掘削開始するが、引き抜き穴３３の掘削に先立ち、図１（ａ）のように、掘削用ケーシング２１のワイヤー収納部２５には、ワイヤー２３の環状部３１を収納し、ワイヤー２３の直線部３６は、ワイヤーガイド溝２４に沿わせ、仮支持材２７によって予め仮止めしておく。
掘削用ケーシング２１により埋設杭２０の先端部まで掘削する。掘削時には、掘削用ケーシング２１の円筒部３５の内側又は外側に沿わせたホースで先端から水等を噴射するようにしてもよい。 The effect | action by the above structures is demonstrated based on FIG.
FIG. 2 (a)
The position of the buried pile 20 buried in the ground 32 is confirmed, and the excavation hole 22 is started to be excavated by the excavating blade 22 around the buried pile 20 by the rotation of the excavating casing 21. Prior to excavation of the extract hole 33, As shown in FIG. 1 (a), the wire storage portion 25 of the excavation casing 21 stores the annular portion 31 of the wire 23, and the straight portion 36 of the wire 23 extends along the wire guide groove 24 to temporarily support the material. 27 is temporarily fixed in advance.
The excavation casing 21 excavates the tip of the buried pile 20. At the time of excavation, water or the like may be injected from the tip with a hose along the inside or outside of the cylindrical portion 35 of the excavating casing 21.

図２（ｂ）
掘削用ケーシング２１が埋設杭２０の最先端部に達してからこの掘削用ケーシング２１を１ｍ程度引き上げる。１ｍ程度引き上げ、ワイヤー収納部２５の位置が埋設杭２０の先端部のワイヤー取り付け位置まで来たら、掘削用ケーシング２１の引き抜きを一時中止する。この状態で、ワイヤー２３の直線部３６を上端のクレーン等の重機３４にて引き上げる。このワイヤー２３は、例えば、２０ｔｏｎでも耐えることのできるものを使用し、仮支持材２７は、５００ｋｇ程度で切断できる番線などで仮保持しておくことにより、ワイヤー２３を重機３４で引き上げると、仮支持材２７が切断され、環状部３１の円形が縮小することによりこの環状部３１でワイヤー収納部２５の仮支持材２７を切断して埋設杭２０に強く締め付けられて巻き付く。 FIG. 2 (b)
After the excavating casing 21 reaches the foremost portion of the buried pile 20, the excavating casing 21 is pulled up by about 1 m. When the position of the wire storage portion 25 reaches the wire attachment position at the tip of the buried pile 20, the extraction of the excavating casing 21 is temporarily stopped. In this state, the straight portion 36 of the wire 23 is pulled up by a heavy machine 34 such as an upper end crane. For example, a wire 23 that can withstand 20 tons is used as the wire 23, and the temporary support 27 is temporarily held by a wire that can be cut at about 500 kg. When the support member 27 is cut and the circular shape of the annular portion 31 is reduced, the temporary support member 27 of the wire storage portion 25 is cut by the annular portion 31 and is strongly tightened and wound around the buried pile 20.

図２（ｃ）
ワイヤー２３の環状部３１を埋設杭２０に強く巻き付くように重機３４に荷重をかけた状態で、掘削用ケーシング２１は、重機３４とは異なる重機で引き上げる。すると、ワイヤー２３の重機３４と環状部３１の連続する部分は、ワイヤー逃げ切欠き２６から外れる。このとき、もし、ワイヤー２３が掘削用ケーシング２１と一緒に引き上げられるようなときには、ワイヤー２３が埋設杭２０に強く締め付けられていないことが分かるので、このようなときには、掘削用ケーシング２１を逆回転すると、ワイヤー逃げ切欠き２６の部分で環状部３１が逆回転してワイヤー２３の環状部３１による締め付けが緩められるので、緩めたら掘削用ケーシング２１を少し戻して（下降して）再び重機３４でワイヤー２３を引き上げて環状部３１の部分を埋設杭２０に強く締め付け固定する。掘削用ケーシング２１を引き上げてもワイヤー２３が上昇することがないときには、環状部３１で埋設杭２０を強く締めあげていることが分かるので、掘削用ケーシング２１だけを引き抜き穴３３から引き抜かれる。 FIG. 2 (c)
The excavation casing 21 is pulled up by a heavy machine different from the heavy machine 34 in a state where a load is applied to the heavy machine 34 so that the annular portion 31 of the wire 23 is strongly wound around the buried pile 20. Then, the continuous portion of the heavy machine 34 and the annular portion 31 of the wire 23 is detached from the wire escape notch 26. At this time, if the wire 23 is pulled up together with the excavation casing 21, it can be seen that the wire 23 is not strongly tightened to the buried pile 20. In such a case, the excavation casing 21 is reversely rotated. Then, the annular portion 31 rotates reversely at the portion of the wire escape notch 26 and the tightening by the annular portion 31 of the wire 23 is loosened. When loosened, the excavating casing 21 is slightly returned (lowered) again by the heavy machine 34. The wire 23 is pulled up and the annular portion 31 is firmly fixed to the buried pile 20. If the wire 23 does not rise even when the excavating casing 21 is pulled up, it can be seen that the buried pile 20 is strongly tightened by the annular portion 31, so that only the excavating casing 21 is pulled out from the extraction hole 33.

図２（ｄ）
掘削用ケーシング２１を引き抜き穴３３から引き上げた後、埋設杭２０を重機３４とワイヤー２３で引き抜く。埋設杭２０が長い時には、地盤３２から地上に引き上げられた部分を５〜１０ｍ程度ずつ切断して順次引き上げることにより引き抜き作業が円滑に行われる。 FIG. 2 (d)
After the excavating casing 21 is pulled up from the pullout hole 33, the buried pile 20 is pulled out by the heavy machine 34 and the wire 23. When the buried pile 20 is long, the portion pulled up from the ground 32 to the ground is cut about 5 to 10 m at a time, and the pulling work is smoothly performed by sequentially lifting the portion.

前記実施例では、前記ワイヤー２３を地上の重機３４で引っ張りにより埋設杭２０を引き抜く工程は、前記掘削用ケーシング２１を地上に引き抜いた後に行うようにしたが、これに限られるものではなく、前記ワイヤー２３を地上の重機３４で引っ張りにより埋設杭２０を引き抜く工程は、埋設杭２０前記掘削用ケーシング２１を地上に引き抜く工程と同時に行うようにすることもできる。   In the embodiment, the step of pulling out the buried pile 20 by pulling the wire 23 with the heavy machine 34 on the ground is performed after the casing 21 for excavation is pulled out on the ground, but is not limited thereto. The process of pulling out the buried pile 20 by pulling the wire 23 with the heavy machine 34 on the ground can be performed simultaneously with the process of pulling out the buried casing 20 and the excavating casing 21 to the ground.

１０…埋設杭、１１…ケーシング、１２…ケーシング、１３…空間、１４…ワイヤー、１５…掘削穴、１６…リング、１７…環状部、１８…地盤、２０…埋設杭、２１…掘削用ケーシング、２２…掘削刃、２３…ワイヤー、２４…ワイヤーガイド溝、２５…ワイヤー収納部、２６…ワイヤー逃げ切欠き、２７…仮支持材、２８…結び窓、２９…固定部材、３０…リング、３１…環状部、３２…地盤、３３…引き抜き穴、３４…重機、３５…円筒部、３６…直線部。   DESCRIPTION OF SYMBOLS 10 ... Embedded pile, 11 ... Casing, 12 ... Casing, 13 ... Space, 14 ... Wire, 15 ... Excavation hole, 16 ... Ring, 17 ... Annular part, 18 ... Ground, 20 ... Embedded pile, 21 ... Excavation casing, 22 ... Excavating blade, 23 ... Wire, 24 ... Wire guide groove, 25 ... Wire storage part, 26 ... Wire escape notch, 27 ... Temporary support material, 28 ... Knotting window, 29 ... Fixing member, 30 ... Ring, 31 ... Annular part, 32 ... ground, 33 ... drawing hole, 34 ... heavy machine, 35 ... cylindrical part, 36 ... straight line part.

Claims (6)

埋設杭の周りに掘削用ケーシングの掘削刃で引き抜き穴を掘削し、前記埋設杭の先端部にワイヤーの環状部を巻きつけて重機によりワイヤーとともに埋設杭を引き抜くようにした埋設杭の引き抜き方法において、
前記掘削用ケーシングの先端部のやや上部の内壁面に設けたワイヤー収納部に、前記環状部を収納し仮止めする工程と、
前記埋設杭の周りに前記掘削用ケーシングで引き抜き穴を掘削する工程と、
前記ワイヤーを地上の重機で引き揚げ、前記ワイヤー収納部に収納された環状部の仮止めを外してこの環状部を前記埋設杭の先端部に巻きつける工程と、
前記ワイヤーを地上の重機の引っ張りにより埋設杭を引き抜く工程と
からなることを特徴とする埋設杭の引き抜き方法。 In the method for extracting a buried pile, a hole is excavated around the buried pile with a drilling blade of a casing for excavation, and an annular portion of the wire is wound around the tip of the buried pile, and the buried pile is drawn together with the wire by a heavy machine. ,
A step of storing and temporarily fixing the annular portion in a wire storage portion provided on an inner wall surface slightly above the tip of the excavation casing;
Drilling a pull hole in the excavation casing around the buried pile;
Hoisting the wire with heavy machinery on the ground, removing the temporary fixing of the annular portion stored in the wire storage portion, and winding the annular portion around the tip of the buried pile;
The method of pulling out the buried pile, comprising: pulling out the buried pile by pulling the heavy machine on the ground. 前記ワイヤーを地上の重機で引っ張りにより埋設杭を引き抜く工程は、前記掘削用ケーシングを地上に引き抜いた後に行うようにしたことを特徴とする請求項１記載の埋設杭の引き抜き方法。   The method of pulling out an embedded pile according to claim 1, wherein the step of pulling out the buried pile by pulling the wire with a heavy machine on the ground is performed after the excavating casing is pulled out on the ground. 前記ワイヤーを地上の重機で引っ張りにより埋設杭を引き抜く工程は、前記掘削用ケーシングを地上に引き抜く工程と同時に行うようにしたことを特徴とする請求項１記載の埋設杭の引き抜き方法。   The method for pulling out an embedded pile according to claim 1, wherein the step of pulling out the buried pile by pulling the wire with a heavy machine on the ground is performed simultaneously with the step of pulling out the casing for excavation to the ground. 前記ワイヤーは、重機３４から前記環状部に至る直線部を掘削用ケーシングの外壁面に沿って案内したことを特徴とする請求項１、２又は３記載の埋設杭の引き抜き方法。   4. The method for pulling out an embedded pile according to claim 1, wherein the wire guides a straight portion extending from the heavy machine 34 to the annular portion along an outer wall surface of a casing for excavation. 埋設杭の周りに掘削用ケーシングの掘削刃で引き抜き穴を掘削し、前記埋設杭の先端部にワイヤーの環状部を巻きつけて重機によりワイヤーとともに埋設杭を引き抜くための埋設杭の引き抜き装置において、
前記掘削用ケーシングは、先端部のやや上部の内壁部に、前記ワイヤーの環状部を収納するワイヤー収納部を全周囲が内方に開口するようにして設け、このワイヤー収納部に、収納した環状部がこのワイヤー収納部から突出するのを防止する仮支持材を所定間隔で設け、前記掘削用ケーシングの外周面に前記ワイヤーの直線部を案内するワイヤーガイド溝を設け、このワイヤーガイド溝の下端部と前記ワイヤー収納部の間に前記ワイヤーの連通するワイヤー逃げ切欠きを設けたことを特徴とする埋設杭の引き抜き装置。 In the extraction device of the buried pile for excavating a drawing hole with the excavating blade of the excavation casing around the buried pile, winding the annular portion of the wire around the tip of the buried pile and drawing the buried pile together with the wire by a heavy machine,
The casing for excavation is provided on the inner wall part slightly above the tip part so that a wire storage part for storing the annular part of the wire is opened inward, and the annular part stored in the wire storage part. Provisional support members for preventing the portion from protruding from the wire storage portion are provided at predetermined intervals, a wire guide groove for guiding the straight portion of the wire is provided on the outer peripheral surface of the excavation casing, and a lower end of the wire guide groove A buried pile extracting device, wherein a wire escape notch communicating with the wire is provided between a wire portion and the wire storage portion. 前記ワイヤー収納部は、内側が開口した断面コ字形をなし、外側面に、所定間隔でワイヤー逃げ切欠きを形成し、このワイヤー逃げ切欠きに臨ませて前記仮支持材を保持する固定部材を設けたことを特徴とする請求項５記載の埋設杭の引き抜き装置。   The wire storage portion has a U-shaped cross section with an inner opening, and a wire escape notch is formed on the outer surface at a predetermined interval, and a fixing member that holds the temporary support material facing the wire escape notch is provided. The buried pile extracting apparatus according to claim 5, which is provided.
JP2016097693A 2016-05-16 2016-05-16 Method and apparatus for extracting buried pile Active JP6392808B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016097693A JP6392808B2 (en) 2016-05-16 2016-05-16 Method and apparatus for extracting buried pile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016097693A JP6392808B2 (en) 2016-05-16 2016-05-16 Method and apparatus for extracting buried pile

Publications (2)

Publication Number Publication Date
JP2017206814A JP2017206814A (en) 2017-11-24
JP6392808B2 true JP6392808B2 (en) 2018-09-19

Family

ID=60415321

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2016097693A Active JP6392808B2 (en) 2016-05-16 2016-05-16 Method and apparatus for extracting buried pile

Country Status (1)

Country Link
JP (1) JP6392808B2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6320606B1 (en) * 2017-07-03 2018-05-09 藤井　健之 Pile removal device and pile removal method
CN108560551A (en) * 2018-04-16 2018-09-21 五冶集团上海有限公司 A kind of pile pulling sleeve and its application method
CN110952555B (en) * 2019-12-09 2022-03-11 广州市盾建建设有限公司 Pile pulling method and pile pulling system
CN110952553B (en) * 2019-12-11 2021-11-30 中铁二十二局集团有限公司 Ground anchor dismantling machine for power engineering
JP7438006B2 (en) 2020-04-23 2024-02-26 株式会社フジタ How to remove existing piles
JP6808084B1 (en) * 2020-06-01 2021-01-06 藤井　健之 Pile pulling method
JP6853990B1 (en) * 2020-11-18 2021-04-07 日本ベース株式会社 Extraction method of existing piles
JP7320288B2 (en) * 2021-03-17 2023-08-03 太洋基礎工業株式会社 Pulling-out device for buried pile and method for backfilling voids left after pulling-out

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6027331B2 (en) * 1980-07-16 1985-06-28 東助 島貫 Underground pile removal method
JP2853275B2 (en) * 1990-06-07 1999-02-03 旭硝子株式会社 Liquid crystal optical element, manufacturing method thereof, and projection display device
JP5632981B1 (en) * 2014-05-08 2014-11-26 横浜ライト工業株式会社 Method for extracting buried pile buried in the ground, and drilling casing structure used therefor

Also Published As

Publication number Publication date
JP2017206814A (en) 2017-11-24

Similar Documents

Publication Publication Date Title
JP6392808B2 (en) Method and apparatus for extracting buried pile
JP5632981B1 (en) Method for extracting buried pile buried in the ground, and drilling casing structure used therefor
JP5890606B2 (en) Pile unfilling method
KR101560382B1 (en) Steel pipe pile anchor device for silt protection
US9574316B2 (en) Suction foundation having enhanced self-weight penetration and construction method thereof
JP6539890B2 (en) Method and apparatus for extracting buried pile
JP2010255300A (en) Pull-out construction method for subterranean residual pile and jig used for construction method
JP5996688B2 (en) Connection structure of backfilling agent supply pipe
JP3159275U (en) Pile extraction jig
JP6320606B1 (en) Pile removal device and pile removal method
JP2007332559A (en) Removal method for existing underground pile
JP4560560B2 (en) Pile construction method
JP2018096155A (en) Existing pile holding apparatus
JP2015151842A (en) Pile head treatment method and pile head burial bag used for pile head treatment
JP2010255214A (en) Casing for pulling out existing pile
JP6465511B2 (en) Plucking machine chucking mechanism and pile removal method
JPS6019827A (en) Drawing work of follower pile
JPS62273322A (en) Drawing work of existing pile and drawer therefor
JP2007138544A (en) Method of pulling out existing pile
JP4437234B2 (en) Method of burying ready-made piles
JP5015104B2 (en) Existing pile cutting device and existing pile removal method
JP2007120123A (en) Pile extraction device
JP5906052B2 (en) Casing device
JP7320288B2 (en) Pulling-out device for buried pile and method for backfilling voids left after pulling-out
JP2003034932A (en) Method of drawing out existing piles and excavation casing used for it

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20171219

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20180820

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20180822

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20180823

R150 Certificate of patent or registration of utility model

Ref document number: 6392808

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250