JP2006241891A - Removal method of buried casing pipe - Google Patents

Removal method of buried casing pipe Download PDF

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JP2006241891A
JP2006241891A JP2005060794A JP2005060794A JP2006241891A JP 2006241891 A JP2006241891 A JP 2006241891A JP 2005060794 A JP2005060794 A JP 2005060794A JP 2005060794 A JP2005060794 A JP 2005060794A JP 2006241891 A JP2006241891 A JP 2006241891A
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casing pipe
cutter
buried
casing
vertical
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JP4389813B2 (en
JP2006241891A5 (en
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Kazuyuki Ichinohe
一幸 一戸
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Abstract

<P>PROBLEM TO BE SOLVED: To remove a buried casing pipe by dividing the buried casing pipe in the longitudinal direction. <P>SOLUTION: A vertical cutter 11 is dropped into a hole bottom section of the casing pipe 1. When a cylinder head 20 is pushed downward by a hydraulic jack in a hydraulic device 16, a cutter arm 17 is pushed and spread, and a cutter bit 18 is pushed against an inner wall of the casing pipe 1. When the vertical cutter 11 is pulled upward by a boring rod 12 while applying the widening force by oil pressure, cutting in the vertical direction of the casing pipe 1 is started by the cutter bit 18. Since the vertical cutter 11 cuts the casing pipe 1 into paper tablet-shaped divided pieces consisting of a plurality of sheets in the longitudinal direction, the casing pipe is removed by pulling out every divided piece. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、不要の埋設ケーシング管を切断し、分割した部分ごとに引き上げる埋設ケーシング管の撤去方法に関するものである。   The present invention relates to a method for removing an embedded casing tube that cuts an unnecessary embedded casing tube and pulls up each divided portion.

腐食や目詰まりによって揚水量が減少した古井戸を再生するために、老朽化したケーシング管を交換する方法として、例えば特許文献１が知られている。この方法は、ケーシング管の回りにその外径よりも大きい内径を持つドリルパイプを上方から垂直に打ち込み、ケーシング管とドリルパイプの間隙に残された土石を、高圧水を噴射しながら崩して、水と共にポンプで地上に汲み上げ、ケーシング管にかかる地山からの外力を取り除いた上で、ケーシング管を上部に引き上げる。そして、空いた穴に新しいケーシング管を埋め込み、ドリルパイプとの間隙に土石を埋め戻して補強し、井戸を更新している。   For example, Patent Document 1 is known as a method of replacing an aged casing pipe in order to regenerate an old well whose yield has been reduced due to corrosion or clogging. In this method, a drill pipe having an inner diameter larger than the outer diameter of the casing pipe is driven vertically from above, and the debris left in the gap between the casing pipe and the drill pipe is broken while jetting high-pressure water, The pump is pumped up with the water together with water, the external force applied to the casing pipe is removed from the ground, and then the casing pipe is pulled up. Then, a new casing pipe is embedded in the vacant hole, and earth and stone are backfilled and reinforced in the gap with the drill pipe, thereby renewing the well.

特開平９−４１８８号公報Japanese Patent Laid-Open No. 9-4188

しかしながら、既設のケーシング管は必ずしも垂直に埋設されているとは限らず、孔底に近付くに従って曲がっている場合があり、上述の従来工法のように垂直にドリルパイプを打ち込んで行くと、曲がって打ち込まれたケーシング管を切断してしまう虞れがある。   However, existing casing pipes are not necessarily buried vertically, they may bend as they approach the bottom of the hole, and when the drill pipe is driven vertically as in the conventional method described above, it will bend. There is a possibility of cutting the driven casing tube.

また、この従来工法ではパイプの打ち込み、土石の取り除き、そしてケーシング管の交換後のケーシング管回りへの土石の埋め込みなど、工程が複雑かつ大規模になり、経費が高くなると共に工期も長くなる欠点がある。   In addition, this conventional method has the disadvantage that the process becomes complicated and large-scale, such as driving the pipe, removing the debris, and embedding the debris around the casing tube after replacing the casing tube, which increases the cost and the construction period. There is.

本発明の目的は、上述の課題を解決し、低コストで短時間に既設のケーシング管を撤去し得る埋設ケーシング管の撤去方法を提供することにある。   The objective of this invention is providing the removal method of the buried casing pipe | tube which solves the above-mentioned subject and can remove the existing casing pipe | tube at low cost in a short time.

上述の目的を達成するための本発明に係る埋設ケーシング管の撤去方法の技術的特徴は、垂直方向に土中に埋設したケーシング管を撤去する場合において、前記ケーシング管を管内から長手方向に複数の短冊片状に切断することにより分割して、分割片を個々に引き抜くことにある。   In order to achieve the above-mentioned object, the technical feature of the method for removing a buried casing pipe according to the present invention is that when removing a casing pipe buried in the soil in the vertical direction, a plurality of said casing pipes are arranged in the longitudinal direction from the inside of the pipe. It is divided by cutting into strips, and the divided pieces are pulled out individually.

本発明に係る埋設ケーシング管の撤去方法によれば、ケーシング管を長手方向に短冊状に切断することにより、地山からケーシング管にかかる圧力を緩和し、分割した部分ごとの引き抜きが可能になり、大掛かりな装置と高い経費を使わずに埋設ケーシング管を撤去することができる。   According to the method for removing a buried casing pipe according to the present invention, by cutting the casing pipe into a strip shape in the longitudinal direction, the pressure applied to the casing pipe from the natural ground can be relieved and the divided parts can be pulled out. The buried casing tube can be removed without using large equipment and high cost.

本発明を図示の実施例に基づいて詳細に説明する。
撤去工事に入る前に、撤去すべきケーシング管内を洗浄することが望ましい。井戸用のモニタとして使われる孔内カメラを使って、ケーシング管の現状を調査して施工の必要性を把握した後に、井戸孔底に滞留するスライム等を除去する。この作業においては、既知のボーリングマシンとベーラを用い、ケーシング管の管壁及び孔底部のスクリーンに付着したスケールを除去するためにブラッシングを行う。 The present invention will be described in detail based on the illustrated embodiments.
It is desirable to clean the inside of the casing tube to be removed before starting the removal work. Using an in-hole camera that is used as a well monitor, the current situation of the casing pipe is investigated and the necessity of construction is grasped, and then slime etc. remaining at the bottom of the well hole is removed. In this operation, using a known boring machine and baler, brushing is performed to remove scale attached to the wall of the casing tube and the screen at the bottom of the hole.

撤去作業では、先ず図１に示すように、撤去すべき例えば直径３０ｃｍ、肉厚６〜９ｍｍのケーシング管１内に、線図で示す水平カッタ２を孔底に向けて降下する。水平カッタ２はケーシング管１を水平方向に切断するための図示しない回転ロータと水平方向切断用カッタアーム３及び水平カッタビット４とを有している。孔底から２〜３ｍ程の上部位置でケーシング管１を水平方向に切断して、スクリーンを含む孔底部をケーシング管１から切り離す。   In the removal operation, as shown in FIG. 1, first, a horizontal cutter 2 shown in a diagram is lowered toward the hole bottom in a casing tube 1 having a diameter of 30 cm and a thickness of 6 to 9 mm to be removed. The horizontal cutter 2 has a rotating rotor (not shown) for cutting the casing tube 1 in the horizontal direction, a horizontal cutting cutter arm 3 and a horizontal cutter bit 4. The casing pipe 1 is cut in the horizontal direction at an upper position of about 2 to 3 m from the hole bottom, and the hole bottom including the screen is cut off from the casing pipe 1.

次いで、図２に示すように垂直カッタ１１を、ボーリングロッド１２にパイプ１３を接続してケーシング管１の底部に降下する。この垂直カッタ１１は、天板１４と底板１５に挟まれ油圧ジャッキを収めた油圧装置１６を有している。底板１５の下方に放射状に配置された複数本のカッタアーム１７が回動自在に取り付けられ、各カッタアーム１７の先端に垂直カッタビット１８が備えられ、対向するカッタアーム１７同士は先端においてスプリング１９により引き合うようにされている。また、油圧装置１６から油圧ジャッキにより上下動されるシリンダヘッド２０が下方に突出され、シリンダヘッド２０の下降によりカッタアーム１７が拡開するようになっている。   Next, as shown in FIG. 2, the vertical cutter 11 is lowered to the bottom of the casing tube 1 by connecting the pipe 13 to the boring rod 12. The vertical cutter 11 includes a hydraulic device 16 that is sandwiched between a top plate 14 and a bottom plate 15 and accommodates a hydraulic jack. A plurality of cutter arms 17 arranged radially below the bottom plate 15 are rotatably attached, and a vertical cutter bit 18 is provided at the tip of each cutter arm 17, and the opposing cutter arms 17 are springs 19 at the tips. To be attracted by. Further, the cylinder head 20 that is moved up and down by the hydraulic jack from the hydraulic device 16 protrudes downward, and the cutter arm 17 is expanded by the lowering of the cylinder head 20.

垂直カッタ１１がケーシング管１の底部に到達したことを確認した上で、図３に示すようにシリンダヘッド２０を油圧装置１６内の油圧ジャッキによって下方に押し下げると、スプリング１９の引張力に抗してカッタアーム１７がそれぞれ拡開し、カッタビット１８をケーシング管１の内壁に押し付ける。   When it is confirmed that the vertical cutter 11 has reached the bottom of the casing tube 1 and the cylinder head 20 is pushed downward by a hydraulic jack in the hydraulic device 16 as shown in FIG. 3, the tensile force of the spring 19 is resisted. Then, the cutter arms 17 are expanded, and the cutter bit 18 is pressed against the inner wall of the casing tube 1.

ここで垂直カッタ１１をパイプ１３により上方に引き上げると、油圧による拡開力と垂直カッタ１１の引抜力によってカッタビット１８によりケーシング管１の垂直方向への切断が開始される。これにより、垂直カッタ１１は図４の断面図に示すように、ケーシング管１を長手方向に数枚から成る短冊状の分割片１ａ〜１ｆに切断する。   Here, when the vertical cutter 11 is pulled upward by the pipe 13, the cutting of the casing pipe 1 in the vertical direction is started by the cutter bit 18 by the hydraulic expansion force and the pulling force of the vertical cutter 11. As a result, the vertical cutter 11 cuts the casing tube 1 into strip-shaped divided pieces 1a to 1f consisting of several pieces in the longitudinal direction, as shown in the sectional view of FIG.

続いて、図５に示すように拡幅用ローラビット３１を取り付けた拡幅ジャッキ３２をケーシング管１内に挿入し、切断後のケーシング管１の分割された分割片１ａ〜１ｆを押し広げ、切断部に剪断面を生じさせる。孔底から始まって上部に至るまで分割片１ａ〜１ｆにずれが生ずると、管状構造が持つ抗力と地山から圧力の均衡が解消されて分割片１ａ〜１ｆはばらばらになり、切断されたケーシング管１の引き抜きが容易になる。   Subsequently, as shown in FIG. 5, a widening jack 32 to which a widening roller bit 31 is attached is inserted into the casing pipe 1, and the divided pieces 1a to 1f of the cut casing pipe 1 are spread and cut. A shearing surface is generated in When the split pieces 1a to 1f are displaced from the bottom of the hole to the top, the balance between the drag and the natural pressure of the tubular structure is canceled, and the split pieces 1a to 1f are separated, and the casing is cut. The tube 1 can be easily pulled out.

切断された短冊片状のケーシング管１の分割片１ａ〜１ｆは、クレーンやボーリングマシンを用いて１片ずつ引き上げる。最初に、切断して切り離し、残留したケーシング管１の孔底部は、図６に示すようにコアチューブ４１とタップ４２を設けたコアチューブヘッド４３により引き上げる。即ち、コアチューブ４１により孔底部の周部を削孔し、タップ４２を残留したケーシング管１に喰い込ませて回収する。   The divided pieces 1a to 1f of the cut strip-shaped casing pipe 1 are pulled up one by one using a crane or a boring machine. First, the hole bottom portion of the casing tube 1 that has been cut and separated and pulled up is pulled up by a core tube head 43 provided with a core tube 41 and a tap 42 as shown in FIG. That is, the peripheral portion of the hole bottom is drilled by the core tube 41, and the tap 42 is bitten into the remaining casing tube 1 and collected.

ケーシング管１を引き上げた後の空孔には、再びボーリングマシンを降下し、井戸の孔底付近まで削孔清掃する。これらを撤去した後には、新しいケーシング管を埋め込めばよい。   The boring machine is lowered again into the hole after the casing pipe 1 is pulled up, and the hole is cleaned to the vicinity of the hole bottom of the well. After removing these, a new casing tube may be embedded.

図７は垂直カッタの他の例の構成図である。この垂直カッタ５１においては、油圧装置１６はカッタアーム１７の下方に取り付けられている。油圧ジャッキによりシリンダヘッド２０が一点鎖線で示すように上昇してカッタアーム１７を下から押し上げることによって、カッタアーム１７が拡開して、カッタビット１８をケーシング管１の内壁に押し付けながら、垂直カッタ５１の引き上げと共に上方に向かってケーシング管１を長手方向に切断する。   FIG. 7 is a configuration diagram of another example of the vertical cutter. In the vertical cutter 51, the hydraulic device 16 is attached below the cutter arm 17. The cylinder head 20 is raised by the hydraulic jack as indicated by a one-dot chain line, and the cutter arm 17 is pushed up from below, whereby the cutter arm 17 is expanded and the cutter bit 18 is pressed against the inner wall of the casing tube 1 while With the lifting of 51, the casing tube 1 is cut in the longitudinal direction upward.

管水平方向切断装置の概念図である。It is a key map of a pipe horizontal direction cutting device. 垂直カッタの構成図である。It is a block diagram of a vertical cutter. 垂直カッタの作用説明図である。It is operation | movement explanatory drawing of a vertical cutter. 切断後のケーシング管の断面図である。It is sectional drawing of the casing pipe | tube after a cutting | disconnection. 拡幅ジャッキの構成図である。It is a block diagram of a wide jack. コアチューブヘッドの構成図である。It is a block diagram of a core tube head. 垂直カッタの他の例の構成図である。It is a block diagram of the other example of a vertical cutter.

符号の説明Explanation of symbols

１ ケーシング管
２ 水平カッタ
４ 水平カッタビット
１１、５１ 垂直カッタ
１６ 油圧装置
１７ カッタアーム
１８ 垂直カッタビット
１９ スプリング
２０ シリンダヘッド
３２ 拡幅ジャッキ
４３ コアチューブヘッド DESCRIPTION OF SYMBOLS 1 Casing pipe 2 Horizontal cutter 4 Horizontal cutter bit 11, 51 Vertical cutter 16 Hydraulic device 17 Cutter arm 18 Vertical cutter bit 19 Spring 20 Cylinder head 32 Widening jack 43 Core tube head

Claims (7)

垂直方向に土中に埋設したケーシング管を撤去する場合において、前記ケーシング管を管内から長手方向に複数の短冊片状に切断することにより分割して、分割片を個々に引き抜くことを特徴とする埋設ケーシング管の撤去方法。   When removing the casing pipe buried in the soil in the vertical direction, the casing pipe is divided into a plurality of strip pieces in the longitudinal direction from the inside of the pipe, and the divided pieces are individually pulled out. Removal method of buried casing pipe. 前記ケーシング管内に複数のカッタビットを備えた垂直カッタを挿入し、前記カッタビットにより前記ケーシング管を長手方向に切断することを特徴とする請求項１に記載の埋設ケーシング管の撤去方法。   The method of removing a buried casing pipe according to claim 1, wherein a vertical cutter having a plurality of cutter bits is inserted into the casing pipe, and the casing pipe is cut in the longitudinal direction by the cutter bit. 前記ケーシング管は下方から上方に向けて切断することを特徴とする請求項１又は２に記載の埋設ケーシング管の撤去方法。   The method for removing a buried casing pipe according to claim 1, wherein the casing pipe is cut from the bottom to the top. 切断後の前記分割片の引き抜きに先立ち、前記ケーシング管内に拡幅装置を挿入し、切断した前記分割片を内側から拡幅することを特徴とする請求項１又は２に記載の埋設ケーシング管の撤去方法。   The method for removing a buried casing pipe according to claim 1 or 2, wherein a widening device is inserted into the casing pipe prior to pulling out the divided piece after cutting, and the cut divided piece is widened from the inside. . 前記長手方向の切断に先立ち、前記ケーシング管内に水平カッタを挿入し、該水平カッタにより孔底において前記ケーシング管を水平方向に切断することを特徴とする請求項１に記載の埋設ケーシング管の撤去方法。   Prior to the cutting in the longitudinal direction, a horizontal cutter is inserted into the casing pipe, and the casing pipe is cut in the horizontal direction at the bottom of the hole by the horizontal cutter. Method. 前記水平切断に先立ち、前記ケーシング管内を洗浄することを特徴とする請求項５に記載の埋設ケーシング管の撤去方法。   6. The method for removing a buried casing pipe according to claim 5, wherein the inside of the casing pipe is washed prior to the horizontal cutting. 前記分割片の引き抜き後に、前記水平切断により切り離した前記ケーシング管の孔底部を引き上げ装置により引き上げることを特徴とする請求項５に記載の埋設ケーシング管の撤去方法。   6. The method for removing a buried casing pipe according to claim 5, wherein after the split piece is pulled out, a hole bottom portion of the casing pipe separated by the horizontal cutting is pulled up by a lifting device.
JP2005060794A 2005-03-04 2005-03-04 Removal method of buried casing pipe Active JP4389813B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2515858A (en) * 2013-07-05 2015-01-07 Bruce Arnold Tunget A simple axial longitudinal well surface cutting apparatus
EP3017138A4 (en) * 2013-07-05 2017-05-31 Bruce A. Tunget Apparatus and mehtod for cultivating a downhole surface
JP2017115910A (en) * 2015-12-21 2017-06-29 鹿島建設株式会社 Pipeline closing method and pipeline removal method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2515858A (en) * 2013-07-05 2015-01-07 Bruce Arnold Tunget A simple axial longitudinal well surface cutting apparatus
GB2515858B (en) * 2013-07-05 2015-10-21 Bruce Arnold Tunget A simple axial longitudinal well surface cutting apparatus
EP3017138A4 (en) * 2013-07-05 2017-05-31 Bruce A. Tunget Apparatus and mehtod for cultivating a downhole surface
JP2017115910A (en) * 2015-12-21 2017-06-29 鹿島建設株式会社 Pipeline closing method and pipeline removal method

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