JP2020200742A - Pile holding body for pulling out underground pile and underground pile pulling out method using pile holding body - Google Patents

Pile holding body for pulling out underground pile and underground pile pulling out method using pile holding body Download PDF

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JP2020200742A
JP2020200742A JP2019117865A JP2019117865A JP2020200742A JP 2020200742 A JP2020200742 A JP 2020200742A JP 2019117865 A JP2019117865 A JP 2019117865A JP 2019117865 A JP2019117865 A JP 2019117865A JP 2020200742 A JP2020200742 A JP 2020200742A
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pile
underground
cylinder
base cylinder
arm
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JP6942911B2 (en
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宏治 柳川
Koji Yanagawa
宏治 柳川
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Sanyu Kiko KK
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Sanyu Kiko KK
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Abstract

To provide a pile holding body for pulling out underground pile which safely and surely pulls out an underground pile even when it is difficult that a sling wire is hooked on the pile and is pulled out, and an underground pile pulling out method.SOLUTION: Gap parts 14 are provided at side face symmetric positions of a vertically opened base cylinder, a movable cylinder that is vertically slide movable along the outer peripheral surface of the base cylinder is provided on the outer part of the base cylinder, a pair of pile holding arms 7 that are rotatably pivoted upward on the lower outer surface of the base cylinder are provided in the gap parts, and the lower parts of a pair of upward support arms 11 are pivoted on the outer surface of the movable cylinder so as to be rotatable with a shaft 12 and are pivoted so as to be rotatable with a shaft 13 penetrating mutually the pile holding arms 7 and the vicinity of the upper parts of the support arms 11. On the other hand, vertically extending long hole-shaped gaps are provided the side faces of the movable cylinder at a position different from positions in plan view of each of the arms and a stopper is projected on the outer peripheral surface of the base cylinder, the stopper is positioned in the gap, and thereby a distance between tips of the pile holding arms 7 is allowed to be varied by lifting the movable cylinder to the base cylinder.SELECTED DRAWING: Figure 6

Description

この発明は、地中杭を引き抜く場合に用いて便利なる杭保持体と、該保持体を用いた新規な杭引き抜き工法に関する。 The present invention relates to a pile holder that is convenient to use when pulling out an underground pile, and a novel pile pulling method using the holder.

従来より、機械装置を用いて地中杭を引き抜く工法があるが、本発明にて示すように、回動型の杭保持アームを用いる方式は現在のところ見当たらない。 Conventionally, there is a method of pulling out an underground pile using a mechanical device, but as shown in the present invention, a method using a rotary pile holding arm has not been found at present.

既述した従来方法には,以下に示す問題があった。
1.杭にワイヤー掛けする方法のため、杭小片等は引き抜くことができず撤去することができない。
2.杭が地中に残されて小片となっていることを確認できない。
3.油圧シリンダーなどを用いた大型の装置が必要である。
本発明は以上に鑑み、上記問題点を解決するために発明されたものである。
The conventional method described above has the following problems.
1. 1. Since the method is to hang a wire on a pile, small pile pieces cannot be pulled out and cannot be removed.
2. 2. It cannot be confirmed that the stakes are left in the ground and become small pieces.
3. 3. A large device using a hydraulic cylinder or the like is required.
In view of the above, the present invention has been invented to solve the above problems.

課題を解決する手段として本発明は以下の構成とした。
すなわち、本発明の一つは、上下開放の基筒を設けるとともに該基筒側面に平面視対称位置に空隙部を設け、該基筒外周面に沿って上下にスライド移動可能なる筒体よりなる可動筒を基筒外方に設け、基筒の下部外面にて適宜支持部材にて回動可能に上向きに軸支される一対の杭保持アームを上記空隙内に設け、可動筒外面に一対の上向きのサポートアーム下部を、上記空隙内であるとともに上記杭保持アーム両脇に適宜支持部材にて回動可能に軸支にて設け、上記杭保持アームとサポートアーム上部近傍を互いに貫通する軸にて、杭保持アームとサポートアームを互いに回動可能に軸支し、一方、上記各アームの平面視位置とは別位置の可動筒側面に上下に延びた長穴状の空隙を設けるとともに、基筒外周面にストッパーを突設し、該ストッパーを該空隙内に位置させることにより、基筒に対する可動筒の昇降にて杭保持アーム先端間距離の可変を可能とするよう構成したことを特徴とする地中杭引き抜き用杭保持体である。
The present invention has the following configuration as a means for solving the problem.
That is, one of the present inventions comprises a cylinder having a vertically open base cylinder and a gap portion provided on the side surface of the base cylinder at a symmetrical position in a plan view so as to be slidable up and down along the outer peripheral surface of the base cylinder. A movable cylinder is provided on the outer surface of the base cylinder, and a pair of pile holding arms that are rotatably and vertically supported by a support member on the lower outer surface of the base cylinder are provided in the gap, and a pair of pile holding arms are provided on the outer surface of the movable cylinder. The lower part of the upward support arm is provided in the gap and on both sides of the pile holding arm by a shaft support so as to be rotatable by a support member as appropriate, and the shaft penetrates the pile holding arm and the vicinity of the upper part of the support arm. The pile holding arm and the support arm are rotatably supported by each other, while an elongated hole-shaped gap extending vertically is provided on the side surface of the movable cylinder at a position different from the plan view position of each arm. By projecting a stopper on the outer peripheral surface of the cylinder and locating the stopper in the gap, the distance between the tips of the pile holding arms can be changed by raising and lowering the movable cylinder with respect to the base cylinder. It is a pile holder for pulling out underground piles.

また本発明の他の一つは、
1.埋設されている地中杭の上方地盤を掘削して杭頭を露出させる第一工程。
2.杭位置まで杭引き抜き機を移動し、足場を養生する第二工程。
3.オーガーケ−シングを杭周に建て込み、その鉛直度を確認する第二工程。
4.オーガーケーシング下端から水を噴出しながら杭周を掘削する第四工程。
5.掘削深度を確認しながら杭と地中面とのえん切りを確認する第五工程。
6.オーガーケーシングを地中より引き上げる第六工程。
7.オーガーケーシング下端に、玉掛けワイヤーをセットして地中に落とし込み、ワイヤーが杭に掛かったことを確認し、地中杭を引き抜く第七工程。
8.地中杭が破砕され、ワイヤー掛けにて杭を引き抜くことが困難な場合において、請求項1にて示した地中杭引き抜き用杭保持体をワイヤーで吊下しつつ、該保持体内に地中杭が位置するよう適正深度まで落とし込み、該保持体を引き上げることにて該保持体に設けた杭保持アームに地中杭が保持されて、この地中杭を地中から引き上げる第八工程。
9.引き抜いた後の孔を埋め戻す第九工程。
以上の各工程よりなることを特徴とする杭引き抜き用杭保持体を用いた地中杭引き抜き工法である。
The other one of the present invention is
1. 1. The first process of excavating the ground above the buried underground pile to expose the pile head.
2. 2. The second process of moving the pile extraction machine to the pile position and curing the scaffolding.
3. 3. The second process of building the auger casing around the pile and checking its verticality.
4. The fourth process of excavating the circumference of the pile while ejecting water from the lower end of the auger casing.
5. The fifth step to confirm the cutting between the pile and the underground surface while checking the excavation depth.
6. The sixth step of pulling up the auger casing from the ground.
7. The seventh step is to set a sling wire at the lower end of the auger casing, drop it into the ground, check that the wire is hooked on the pile, and pull out the underground pile.
8. When the underground pile is crushed and it is difficult to pull out the pile by wire hanging, the pile holder for pulling out the underground pile shown in claim 1 is suspended by a wire, and the pile is suspended in the ground. The eighth step in which the underground pile is held by the pile holding arm provided on the holding body by dropping it to an appropriate depth so that the pile is located and pulling up the holding body, and the underground pile is pulled up from the ground.
9. The ninth step of backfilling the hole after it has been pulled out.
This is an underground pile pulling method using a pile holding body for pulling out piles, which comprises the above steps.

本発明は下記の効果を有する。
1.地中杭に直接ワイヤーを掛ける従来法では引き抜くことが困難な破砕杭を引き抜くことができる。
2.対向する杭保持アームが破砕した地中杭側面に接して、杭の自重にて該アームを接近する方向へと付勢されるので、安全確実に地中杭を保持して引き抜くことができる。
3.筒体とアームにて主要部を構成したので、引き上げた小片や土をすみやかに確認して除去することができる。
4.筒体とアームにて構成したので、構造が単純かつ製作費用負担を少なくすることができる。
The present invention has the following effects.
1. 1. It is possible to pull out a crushed pile that is difficult to pull out by the conventional method of hanging a wire directly on an underground pile.
2. 2. Since the opposing pile holding arm comes into contact with the side surface of the crushed underground pile and is urged in the direction of approaching the arm by the weight of the pile, the underground pile can be safely and surely held and pulled out.
3. 3. Since the main part is composed of a cylinder and an arm, it is possible to quickly check and remove the pulled-up small pieces and soil.
4. Since it is composed of a cylinder and an arm, the structure is simple and the burden of manufacturing costs can be reduced.

従来例の杭引き抜き手順フローチャートConventional example pile pulling procedure flowchart 従来例の杭引き抜き手順説明図Explanatory drawing of pile pulling procedure of conventional example 本発明の地中杭引き抜き用杭保持体の平面図Top view of the pile holder for pulling out underground piles of the present invention 本発明の地中杭引き抜き用杭保持体の正面図Front view of pile holder for pulling out underground piles of the present invention 本発明の地中杭引き抜き用杭保持体の左側面図Left side view of the pile holder for pulling out underground piles of the present invention 本発明の地中杭引き抜き用杭保持体の杭保持アーム位置変化説明図Explanatory drawing of change in position of pile holding arm of pile holding body for pulling out underground pile of this invention 本発明の地中杭引き抜き用杭保持体のアーム位置変化説明線図Explanation diagram of arm position change of pile holder for pulling out underground pile of this invention 本発明の地中杭引き抜き用杭保持体の各筒位置関係説明図Explanatory drawing of each cylinder position relationship of pile holder body for pulling out underground pile of this invention 本発明の地中杭引き抜き用杭保持体の杭保持状態説明図Explanatory drawing of pile holding state of pile holding body for pulling out underground pile of this invention 本発明の地中杭引き抜き手順フローチャートFlow chart of underground pile pulling procedure of the present invention 本発明の地中杭引き抜き手順説明図Explanatory drawing of underground pile pulling procedure of this invention

以下、本発明の実施形態について説明する。まず、本発明の説明の前に、従来手段について説明する。
従来手段による地中杭引き抜き手順:
1.地盤掘削および逃げ芯セット(図2−a,b)
バックホウで杭上方の地面を掘削して杭頭を露出させる。杭芯が不明となる恐れのあるときは、逃げ芯を2箇所以上設ける。地盤崩落の危険がある場合は、転落防止柵を設置し、スタンドパイプ(重機転倒防止対策用型枠)設置後、地盤を埋め戻す。
2.杭抜き機の据え付け
杭抜き位置まで杭抜き機を移動し、足場を確実に養生する。このとき、杭の仮置き位置、施工順序、残渣処理場所等を確認する。
3.オーガーケーシング建て込み)(図2−c)
オーガーケーシングを杭周に建て込むとともに、2方向からその鉛直を確認する。
油圧ホース、ウォータージェットホース等の接続を確認する。
4.掘削(図2−c)
該ケーシング下端から水を噴出させ,地中杭の抵抗や土質に適した速度で掘削する。
Hereinafter, embodiments of the present invention will be described. First, prior to the description of the present invention, the conventional means will be described.
Underground pile pulling procedure by conventional means:
1. 1. Ground excavation and escape core set (Figs. 2-a, b)
Excavate the ground above the pile with a backhoe to expose the pile head. If there is a risk that the pile core will be unknown, provide two or more relief cores. If there is a risk of ground collapse, install a fall prevention fence, install a stand pipe (form for heavy equipment fall prevention measures), and then backfill the ground.
2. 2. Installation of the pile puller Move the pile puller to the pile pulling position to ensure that the scaffolding is cured. At this time, the temporary placement position of the pile, the construction order, the residue treatment place, etc. are confirmed.
3. 3. Built-in auger casing) (Fig. 2-c)
Build the auger casing around the pile and check its verticality from two directions.
Check the connection of the hydraulic hose, water jet hose, etc.
4. Excavation (Fig. 2-c)
Water is ejected from the lower end of the casing to excavate at a speed suitable for the resistance and soil quality of underground piles.

5.杭と地盤とのえん切りを確認する(図2−d)
掘削速度を確認しながら、杭の挙動や回転等にてえん切りを確認する。
6.ケーシング引き上げ(図2−e)
オーガーケーシングに付着した土の落下による危険がある場合は、引き上げ時に除去する。
7.地中杭の引き抜き(コンクリートパイル)(図2−f,g)
ケーシング下端に玉掛けワイヤーをセットし、該パイルが安全に引き抜ける位置まで玉掛けワイヤーを落とし込む。
ケーシングを引き抜き、確実にワイヤーが杭に掛かったことを確認してから徐々にパイルを引き抜く。パイルが中間で切断されて地中に残ったときは、その深度を確認しながら再度ワイヤー掛けを行って引き抜く。
8.掘削孔の養生(図2−h)
砂をバックホウで埋め戻す。
以上の工程を,各パイル毎に行う。
5. Check the cutting between the pile and the ground (Fig. 2-d)
While checking the excavation speed, check the cutting by the behavior and rotation of the pile.
6. Casing pulling (Fig. 2-e)
If there is a risk of soil falling on the auger casing, remove it when pulling up.
7. Extraction of underground piles (concrete pile) (Fig. 2-f, g)
Set the sling wire at the lower end of the casing, and drop the sling wire to a position where the pile can be safely pulled out.
Pull out the casing, make sure that the wire is hooked on the pile, and then gradually pull out the pile. If the pile is cut in the middle and remains in the ground, wire it again while checking its depth and pull it out.
8. Curing of excavation holes (Fig. 2-h)
Backhoe the sand.
The above steps are performed for each pile.

次に、本発明にて用いる地中杭引き抜き用杭保持体について説明する。
図において、1は基筒で、所定長の金属製円筒である。2は可動筒で、金属製円筒であるとともに、その上端より少し下がった位置の外周に上段部3を有している。
また、前記の基筒についても、その下端からやや上がった位置の外周に下段部4を有しており、可動筒内径は基筒外径よりわずかに大きく、従って可動等は基筒外周をガイドとしてスライド移動が可能である。
Next, a pile holder for pulling out an underground pile used in the present invention will be described.
In the figure, reference numeral 1 denotes a base cylinder, which is a metal cylinder having a predetermined length. Reference numeral 2 denotes a movable cylinder, which is a metal cylinder and has an upper portion 3 on the outer periphery at a position slightly lower than the upper end thereof.
Further, the above-mentioned base cylinder also has a lower portion 4 on the outer circumference at a position slightly raised from the lower end thereof, and the inner diameter of the movable cylinder is slightly larger than the outer diameter of the base cylinder. Therefore, the movable or the like guides the outer circumference of the base cylinder. It is possible to move the slide as.

5は平板状の杭保持アームステーで、基筒の下部外面に一対が所定間隔にて固着突設される。この杭保持アームステーは有孔であって、この孔内にアーム保持軸6が挿通固定される。7は杭保持アームで、その先端を斜方形成した角形棒体であって、その下部近傍に孔が穿設され、この孔内に前記のアーム保持軸がゆるく挿通されており、図5にて示すように、杭保持アームステー間に、この杭保持アームが回動可能に位置している。 Reference numeral 5 denotes a flat plate-shaped pile holding arm stay, in which a pair is fixedly projected on the lower outer surface of the base cylinder at predetermined intervals. The pile holding arm stay has a hole, and the arm holding shaft 6 is inserted and fixed in the hole. Reference numeral 7 denotes a pile holding arm, which is a square rod whose tip is formed obliquely, and a hole is formed in the vicinity of the lower portion thereof, and the arm holding shaft is loosely inserted into the hole. As shown in the above, the pile holding arm is rotatably located between the pile holding arm stays.

10はサポートアームステーで、前記の杭保持アームステーと同様構成であって、可動筒外面に固着突設される。11はサポートアームで、所定長の有孔棒体であり、所定間隔を有して一対が設けられる。12はサポートアーム下部保持軸で、図5にて示すように、サポートアームステーとサポートアーム間に、各々の孔を介してサポートア−ムステーに挿入固着される。このサポートアームの孔は下部保持軸に対し回動可能である。
この下部保持軸は、一対が対称形に設けられる。13はサポートアーム上部保持軸で、一対のサポートアームおよび前記の杭保持アームに各々設けられる孔内に挿入保持される。なお、この軸に対し杭保持アームは回動可能である。
Reference numeral 10 denotes a support arm stay, which has the same configuration as the pile holding arm stay described above, and is fixedly projected on the outer surface of the movable cylinder. Reference numeral 11 denotes a support arm, which is a perforated rod body having a predetermined length, and a pair is provided with a predetermined interval. Reference numeral 12 denotes a support arm lower holding shaft, which is inserted and fixed to the support arm stay between the support arm stay and the support arm through the respective holes as shown in FIG. The hole of this support arm is rotatable with respect to the lower holding shaft.
A pair of lower holding shafts is provided symmetrically. Reference numeral 13 denotes a support arm upper holding shaft, which is inserted and held in holes provided in each of the pair of support arms and the pile holding arm. The pile holding arm is rotatable with respect to this axis.

14は基筒および可動筒に設けられる空隙部で、この空隙部内に既述の各アーム等が位置している。
15は可動筒に設けられる角形の空隙で、平面視対称形であると共に、前記の各アーム位置とは90度移行した位置に一対が設けられる。16はストッパーで、基筒外面適所に突設される直方体形状部分であって、上記の空隙内に位置している。
以上が地中杭引き抜き用杭保持体20の基本構成である。
Reference numeral 14 denotes a gap portion provided in the base cylinder and the movable cylinder, and each arm or the like described above is located in the gap portion.
Reference numeral 15 denotes a square void provided in the movable cylinder, which is symmetrical in a plan view and is provided with a pair at a position shifted by 90 degrees from each of the above arm positions. Reference numeral 16 denotes a stopper, which is a rectangular parallelepiped-shaped portion projecting at an appropriate position on the outer surface of the base cylinder and is located in the above-mentioned gap.
The above is the basic configuration of the pile holder 20 for pulling out underground piles.

次に、本保持体の機能と作用について説明する。
前記したように、基筒に沿って可動筒は上下にスライド可能であって、このスライドにて各アーム位置が変化する。可動筒が基筒に対して最下位置のとき、可動筒下端は下段部4に接し、またストッパー上端は空隙内最上位置にある。
可動筒を上方にスライド移動させると、サポートアームはその下部にはサポートアーム下部保持軸が位置し、上部にはサポートアーム上部保持軸が、杭保持アームと共通に位置しており、このサポートアームは下部保持軸を回動中心として筒内方へと倒れ込むが、上記のようにサポートアームは杭保持アームに関連づけされているために、杭保持アームも筒内方へと倒れ込むのである。この倒れ込みにて杭保持アーム先端間距離は小さくなる。
Next, the function and operation of this holder will be described.
As described above, the movable cylinder can be slid up and down along the base cylinder, and the position of each arm is changed by this slide. When the movable cylinder is at the lowest position with respect to the base cylinder, the lower end of the movable cylinder is in contact with the lower stage portion 4, and the upper end of the stopper is at the uppermost position in the gap.
When the movable cylinder is slid upward, the support arm lower part holding shaft is located at the lower part of the support arm, and the support arm upper holding shaft is located at the upper part in common with the pile holding arm. Will fall inward in the cylinder with the lower holding shaft as the center of rotation, but since the support arm is associated with the pile holding arm as described above, the pile holding arm also falls inward in the cylinder. This collapse reduces the distance between the tips of the pile holding arms.

これを図7にて説明すると、サポートアーム全体はスライド移動にて上方へ移動するが、サポートアーム上端近傍は杭保持アームに軸にて関連づけられているため、スライド前のサポートアームの角度を保持しようとすると、杭保持アーム全体を上方へ引き上げることとなるが、この杭保持アーム下部はステーにてその位置は上昇できない。
そのために、サポートアームの角度は変化して筒内へと倒れ込むこととなる。
サポートアームと杭保持アームは軸にて関連づけられているために、杭保持アームも同様に筒内方へと倒れ込むこととなり、従って一対の対向配置されている杭保持アームの上端間距離は接近することとなり、この接近にて図9にて示すように、地中杭外周面を押圧保持することができる。以上の動きは可動筒の昇降にて可逆的である。
Explaining this with reference to FIG. 7, the entire support arm moves upward by sliding movement, but since the vicinity of the upper end of the support arm is associated with the pile holding arm by an axis, the angle of the support arm before sliding is maintained. If this is to be done, the entire pile holding arm will be pulled upward, but the position of the lower part of the pile holding arm cannot be raised by the stay.
Therefore, the angle of the support arm changes and it falls into the cylinder.
Since the support arm and the pile holding arm are related by the shaft, the pile holding arm also falls inward in the cylinder, and therefore the distance between the upper ends of the pair of opposed pile holding arms is close. Therefore, as shown in FIG. 9, the outer peripheral surface of the underground pile can be pressed and held by this approach. The above movement is reversible when the movable cylinder is raised and lowered.

この状態にて、可動筒および基筒を杭に対して上昇させると、地中杭は該筒に対して下方移動しようとするが、該杭得意保持アームとの摩擦にて、杭保持アームは筒内方へ倒れ込もうとする力が働き、これにて該アームはより強固な押圧を地中杭に対して与えることとなるために、杭はアームに保持されたまま上方移動して、地中から杭を抜き去ることができる。なお、可動筒の昇降可能範囲はストッパー上下端が空隙15の上下端に接することにて規制される。なお、杭を地中から抜いた後は、杭に対して該筒は下方移動させることにて杭から本品を離脱させることができる。 In this state, when the movable cylinder and the base cylinder are raised with respect to the pile, the underground pile tries to move downward with respect to the cylinder, but the pile holding arm moves due to friction with the pile specialty holding arm. A force that tries to collapse inward of the cylinder acts, which causes the arm to exert stronger pressure on the underground pile, so that the pile moves upward while being held by the arm. Pile can be pulled out from the ground. The movable cylinder can be raised and lowered by the upper and lower ends of the stopper being in contact with the upper and lower ends of the gap 15. After the pile is pulled out from the ground, the product can be separated from the pile by moving the cylinder downward with respect to the pile.

次に、本発明による地中杭引き抜き用杭保持体を用いた地中杭引き抜き工法について説明する。
1.地盤掘削・杭頭確認・逃げ芯セット(図11−a,b)
バックホウで地盤を掘削し、杭頭を露出させる。杭頭の倒れ等の有無を考慮し、杭芯が不明となる恐れがあるときは、逃げ芯を2箇所以上設置する。地盤崩落の危険があるときは、転落防止柵を設置し、スタンドパイプ設置後、地盤を埋め戻す。
2.杭抜き機据え付け
杭抜き位置まで杭抜き機を移動し、足場を確実に養生する。このとき、杭の仮置き位置、施工順序、残土処理場所等を確認しておく。
3.オーガーケーシング建て込み(図11−c)
オーガーケーシングを杭周に建て込むと共に、2方向からオーガーケーシングの鉛直を確認する。オーガーケーシング用油圧ホース、ウォータージェットホース等の接続を確認する。
4.掘削(図11−c)
オーガーケーシング先端から水を噴出させ、地中杭の抵抗や土質に適した速度で掘削する。
5.杭・地盤とのえん切り確認(図11−d)
掘削深度を確認しながら杭の挙動や回転等により、えん切りを確認する。
6.ケーシング引き上げ(図11−c)
オーガーケーシングに付着した土の落下による危険があるときは、引き上げ時に取り除く。
Next, the underground pile pulling method using the pile holder for pulling out the underground pile according to the present invention will be described.
1. 1. Ground excavation, pile head confirmation, escape core set (Figs. 11-a, b)
Excavate the ground with a backhoe to expose the pile head. If there is a risk that the pile core will be unclear in consideration of the presence or absence of the pile head falling, install two or more relief cores. If there is a risk of ground collapse, install a fall prevention fence, install a stand pipe, and then backfill the ground.
2. 2. Installation of pile pulling machine Move the pile pulling machine to the pile pulling position to surely cure the scaffolding. At this time, confirm the temporary placement position of the pile, the construction order, the residual soil treatment place, etc.
3. 3. Built-in auger casing (Fig. 11-c)
Build the auger casing around the pile and check the verticality of the auger casing from two directions. Check the connection of the hydraulic hose for the auger casing, water jet hose, etc.
4. Excavation (Fig. 11-c)
Water is ejected from the tip of the auger casing to excavate at a speed suitable for the resistance and soil quality of underground piles.
5. Confirmation of cutting with piles and ground (Fig. 11-d)
While checking the excavation depth, check the cutting by the behavior and rotation of the pile.
6. Casing pulling (Fig. 11-c)
If there is a risk of soil falling on the auger casing, remove it when pulling up.

7.地中杭(コンクリートパイル)の引き抜き
(7−1)(図11−f,g)
ケーシング先端に玉掛けワイヤーをセットし、該パイルが安全に引き抜ける位置まで落とし込む。ケーシングを引き抜き、確実にワイヤーが杭に掛かったことを確認してから,徐々にパイルを引き抜く。パイルが中間で切断されて地中に残ったときは、その深度を確認しながら,再度ワイヤー掛けを行って引き抜く。
(7−2)(図11h〜l)
コンクリートパイルが破砕され、ワイヤー掛けで引き抜くことが困難な場合、チャッキング装置(本発明による地中杭引き抜き用杭保持体)の上部にケーシング先端をはめ込み、クレーンフックをチャッキングに装着された2本のワイヤーに掛け、適度にワイヤーを張り、ケーシング、チャッキングを一体として杭孔下端付近まで落とし込む。
適正深度を確認後、挿入時同様にケーシング、チャッキングを一体として徐々に引き上げる。クレーンフックを緩めてケーシングを外し、チャッキング、ケーシング内の杭破砕片、鉄筋等を確認し、取り除く。なお、図示を略したが、可動筒外面にはフックが設けられ、そのフックにワイヤーが取り付けられて、クレーンにてチャッキング装置が吊下される。
8.掘削孔の養生(図11−m)
砂をバックホウにて埋め戻す。以上の各工程を各杭に対してくり返す。
7. Extraction of underground pile (concrete pile) (7-1) (Fig. 11-f, g)
Set the sling wire at the tip of the casing and drop it to the position where the pile can be safely pulled out. Pull out the casing, make sure that the wire is hooked on the pile, and then gradually pull out the pile. If the pile is cut in the middle and remains in the ground, wire it again while checking its depth and pull it out.
(7-2) (Figs. 11h to l)
When the concrete pile is crushed and it is difficult to pull it out by wire hooking, the tip of the casing is fitted on the upper part of the chucking device (pile holder for pulling out the underground pile according to the present invention), and the crane hook is attached to the chucking. Hang it on the wire of the book, stretch the wire appropriately, and drop the casing and chucking together to the vicinity of the lower end of the pile hole.
After confirming the proper depth, gradually pull up the casing and chucking as a unit, as when inserting. Loosen the crane hook, remove the casing, check for chucking, crushed pile fragments in the casing, reinforcing bars, etc., and remove them. Although not shown, a hook is provided on the outer surface of the movable cylinder, a wire is attached to the hook, and the chucking device is suspended by a crane.
8. Curing of excavation holes (Fig. 11-m)
Fill the sand back with a backhoe. Each of the above steps is repeated for each pile.

以上、本発明について記したが、本発明は従来法の玉掛けワイヤーを地中杭に掛けて引き抜く手段とは異なり、杭保持体を用いて、破砕した杭をも引き抜くところにその特徴を有するものである。
従来法は既述のように、諸準備の後に玉掛けワイヤーを掘削孔中の杭に掛けて引き上げるものであり、杭が破砕していない場合にはこの方法で対処ができるが、破砕している杭に対しては効果を発揮することができない。玉掛けワイヤーは引くと締まる環状部分を杭に掛けて引き上げるのであるが、破砕箇所はこのワイヤーにてくずれてしまうために、引き上げが困難となる。
Although the present invention has been described above, the present invention is different from the conventional method of hanging a sling wire on an underground pile and pulling it out, and has a feature in that a crushed pile is also pulled out by using a pile holder. Is.
As described above, the conventional method involves hanging the sling wire on the pile in the excavation hole and pulling it up after various preparations. If the pile is not crushed, this method can be used, but it is crushed. It cannot be effective against piles. The sling wire is pulled up by hanging an annular part that tightens when pulled on a pile, but the crushed part is broken by this wire, which makes it difficult to pull up.

これに対し本発明は既述のように、対向する杭保持アームを杭外面に押圧接触させる方式のために、破砕した杭箇所を外方から強固に押圧して杭形状を保持したまま引き上げることが可能である。またその押圧は他の動力源を用いずに杭自重にて自然になされるものであるために、従来法では不能であった破砕杭をも引き上げることができるのである。
なお、手順としてはまず従来法による引き抜きを行い、杭の状態を判断して本発明方式を用いることができる。以上のごとく、本発明によって、従来法では不能であった破砕杭の引き上げを可能とする新規かつ有用なる、地中杭引き抜き用の杭保持体と、該保持体を用いた地中杭引き抜き工法を得ることができる。
On the other hand, as described above, in the present invention, since the opposing pile holding arms are pressed and contacted with the outer surface of the pile, the crushed pile portion is strongly pressed from the outside and pulled up while maintaining the pile shape. Is possible. Moreover, since the pressing is naturally performed by the weight of the pile without using another power source, it is possible to pull up the crushed pile, which was not possible by the conventional method.
As a procedure, the method of the present invention can be used by first pulling out by the conventional method and determining the state of the pile. As described above, according to the present invention, a new and useful pile holder for pulling out underground piles, which enables pulling up of crushed piles, which was not possible by the conventional method, and an underground pile pulling method using the holder. Can be obtained.

1 基筒
2 可動筒
3 上段部
4 下段部
5 杭保持アームステー
6 アーム保持軸
7 杭保持アーム
8 地中杭
10 サポートアームステー
11 サポートアーム
12 サポートアーム下部保持軸
13 サポートアーム上部保持軸
14 空隙部
15 空隙
16 ストッパー
20 地中杭引き抜き用杭保持体
1 Base cylinder 2 Movable cylinder 3 Upper part 4 Lower part 5 Pile holding arm stay 6 Arm holding shaft 7 Pile holding arm 8 Underground pile 10 Support arm stay 11 Support arm 12 Support arm Lower holding shaft 13 Support arm Upper holding shaft 14 Void Part 15 Void 16 Stopper 20 Pile holder for pulling out underground piles

Claims (2)

上下開放の基筒を設けるとともに該基筒側面に平面視対称位置に空隙部を設け、該基筒外周面に沿って上下にスライド移動可能なる筒体よりなる可動筒を基筒外方に設け、基筒の下部外面にて適宜支持部材にて回動可能に上向きに軸支される一対の杭保持アームを上記空隙内に設け、可動筒外面に一対の上向きのサポートアーム下部を、上記空隙内であるとともに上記杭保持アーム両脇に適宜支持部材にて回動可能に軸支にて設け、上記杭保持アームとサポートアーム上部近傍を互いに貫通する軸にて、杭保持アームとサポートアームを互いに回動可能に軸支し、一方、上記各アームの平面視位置とは別位置の可動筒側面に上下に延びた長穴状の空隙を設けるとともに、基筒外周面にストッパーを突設し、該ストッパーを該空隙内に位置させることにより、基筒に対する可動筒の昇降にて杭保持アーム先端間距離の可変を可能とするよう構成したことを特徴とする地中杭引き抜き用杭保持体。 A movable cylinder made of a cylinder that can be slid up and down along the outer peripheral surface of the base cylinder is provided on the outside of the base cylinder by providing a base cylinder that is open vertically and providing a gap portion on the side surface of the base cylinder at a symmetrical position in a plan view. A pair of pile holding arms that are rotatably supported upward by a support member on the lower outer surface of the base cylinder are provided in the gap, and a pair of upward support arm lower parts are provided on the outer surface of the movable cylinder. The pile holding arm and the support arm are provided on both sides of the pile holding arm by a shaft support that can be rotated by a support member as appropriate, and the pile holding arm and the support arm are provided on a shaft that penetrates each other near the upper part of the pile holding arm and the support arm. The shafts are rotatably supported by each other, while an elongated hole-shaped gap extending vertically is provided on the side surface of the movable cylinder at a position different from the plan view position of each arm, and a stopper is provided on the outer peripheral surface of the base cylinder. A pile holder for pulling out an underground pile, characterized in that the stopper is positioned in the gap so that the distance between the tips of the pile holding arms can be changed by raising and lowering the movable cylinder with respect to the base cylinder. .. 1.埋設されている地中杭の上方地盤を掘削して杭頭を露出させる第一工程。
2.杭位置まで杭引き抜き機を移動し、足場を養生する第二工程。
3.オーガーケ−シングを杭周に建て込み、その鉛直度を確認する第三工程。
4.オーガーケーシング下端から水を噴出しながら杭周を掘削する第四工程。
5.掘削深度を確認しながら杭と地中面とのえん切りを確認する第五工程。
6.オーガーケーシングを地中より引き上げる第六工程。
7.オーガーケーシング下端に、玉掛けワイヤーをセットして地中に落とし込み、ワイヤーが杭に掛かったことを確認し、地中杭を引き抜く第七工程。
8.地中杭が破砕され、ワイヤー掛けにて杭を引き抜くことが困難な場合において、請求項1にて示した地中杭引き抜き用杭保持体をワイヤーで吊下しつつ、該保持体内に地中杭が位置するよう適正深度まで落とし込み、該保持体を引き上げることにて該保持体に設けた杭保持アームに地中杭が保持されて、この地中杭を地中から引き上げる第八工程。
9.引き抜いた後の孔を埋め戻す第九工程。
以上の各工程よりなることを特徴とする杭引き抜き用杭保持体を用いた地中杭引き抜き工法。
1. 1. The first process of excavating the ground above the buried underground pile to expose the pile head.
2. 2. The second process of moving the pile extraction machine to the pile position and curing the scaffolding.
3. 3. The third process of building the auger casing around the pile and checking its verticality.
4. The fourth process of excavating the circumference of the pile while ejecting water from the lower end of the auger casing.
5. The fifth step to confirm the cutting between the pile and the underground surface while checking the excavation depth.
6. The sixth step of pulling up the auger casing from the ground.
7. The seventh step is to set a sling wire at the lower end of the auger casing, drop it into the ground, check that the wire is hooked on the pile, and pull out the underground pile.
8. When the underground pile is crushed and it is difficult to pull out the pile by wire hanging, the pile holder for pulling out the underground pile shown in claim 1 is suspended by a wire, and the pile is suspended in the ground. The eighth step in which the underground pile is held by the pile holding arm provided on the holding body by dropping it to an appropriate depth so that the pile is located and pulling up the holding body, and the underground pile is pulled up from the ground.
9. The ninth step of backfilling the hole after it has been pulled out.
An underground pile pulling method using a pile holder for pulling out piles, which comprises each of the above steps.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005061158A (en) * 2003-08-19 2005-03-10 Ichiro Matsumoto Pull-out device
JP2015212464A (en) * 2014-05-01 2015-11-26 日進機材株式会社 Pile extraction device
JP2015214795A (en) * 2014-05-08 2015-12-03 横浜ライト工業株式会社 Pull-out method of embedded pile embedded in ground and drilling casing structure for use in the same
JP2017227049A (en) * 2016-06-23 2017-12-28 太洋基礎工業株式会社 Pulling out method for embedded pile and apparatus thereof
JP2019002265A (en) * 2017-11-15 2019-01-10 株式会社徳永組 Pile cap, and method for pulling out pile
JP2019015076A (en) * 2017-07-06 2019-01-31 株式会社徳永組 Pile cutting device, pile extraction method using pile cutting device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005061158A (en) * 2003-08-19 2005-03-10 Ichiro Matsumoto Pull-out device
JP2015212464A (en) * 2014-05-01 2015-11-26 日進機材株式会社 Pile extraction device
JP2015214795A (en) * 2014-05-08 2015-12-03 横浜ライト工業株式会社 Pull-out method of embedded pile embedded in ground and drilling casing structure for use in the same
JP2017227049A (en) * 2016-06-23 2017-12-28 太洋基礎工業株式会社 Pulling out method for embedded pile and apparatus thereof
JP2019015076A (en) * 2017-07-06 2019-01-31 株式会社徳永組 Pile cutting device, pile extraction method using pile cutting device
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