JP4662907B2 - Steel pipe drawing spear and steel pipe drawing method - Google Patents

Steel pipe drawing spear and steel pipe drawing method Download PDF

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JP4662907B2
JP4662907B2 JP2006289147A JP2006289147A JP4662907B2 JP 4662907 B2 JP4662907 B2 JP 4662907B2 JP 2006289147 A JP2006289147 A JP 2006289147A JP 2006289147 A JP2006289147 A JP 2006289147A JP 4662907 B2 JP4662907 B2 JP 4662907B2
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steel pipe
spear
slider
jaw
main body
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JP2008106480A (en
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一郎 芝宮
剛 安部
年宏 北原
保 栗本
大輔 太田
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TOA-TONE BORING CO., LTD.
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TOA-TONE BORING CO., LTD.
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本発明は、地中に設置されている鋼管等を地上に引き抜いて回収するためのスピア及び引き抜き方法に関する。   The present invention relates to a spear and a drawing method for drawing and collecting a steel pipe or the like installed in the ground on the ground.

坑内に遺留されたボーリングロッド等の掘管やケーシングを回収したり、地中に設置されたケーシングを回収しなければならない場合がある。これらの鋼管の外周は各種の地層と密着しているため、引き抜き回収対象鋼管を包み込むオーバサイズの鋼管を圧入または掘削して仮設置して引き抜き回収する方法が提案されているが、費用と工期の増大を来たしていた。   In some cases, it is necessary to collect a digging pipe or casing such as a boring rod left in the mine or to collect a casing installed in the ground. Since the outer periphery of these steel pipes is in close contact with various formations, a method has been proposed in which an oversized steel pipe that encloses the steel pipe to be withdrawn / recovered is press-fitted or excavated and temporarily installed to withdraw and collect. The increase was coming.

特開平０９−２２８３６９JP 09-228369 A 特開平１０−０１８７４３JP 10-018743 A 特開２００４−１３２０３５JP2004-132035

設置されている鋼管等を地中から引き抜く場合、引き抜き対象の鋼管等を包み込む鋼管を地中に圧入または掘削して仮設置し、地層との縁を切って引き抜く方法が採られていた。引き抜き対象鋼管等の径より大きな径の鋼管を仮設置しなければならず、大掛かりな装置を必要とし、費用と工期がかかるという問題があった。
本発明は、圧入または掘削による仮設置鋼管を必要とすることなく、引き抜き対象の鋼管の内壁を使用して簡単に引き抜きをおこなえるようにすることである。 When a steel pipe or the like installed is pulled out from the ground, a method has been employed in which a steel pipe that wraps the steel pipe or the like to be pulled out is temporarily inserted or excavated into the ground and then cut off at the edge with the formation. There is a problem in that a steel pipe having a diameter larger than the diameter of the steel pipe to be pulled out has to be temporarily installed, which requires a large-scale device, and costs and work time are required.
An object of the present invention is to enable easy drawing using an inner wall of a steel pipe to be drawn without requiring a temporarily installed steel pipe by press fitting or excavation.

上端部にカップリングを有する本体、本体下部にはネジ作用で上下動する下拡がりのテーパを有するスライダが設けてあり、スライダの外側にはスライダのテーパによって外部に拡張するジョーが設けてある。ジョーは外面側に歯が設けてあると共に回転防止用のフリクションスプリングが設けてあり、本体の先端部にはノーズが設けてある。ノーズにはジョーを上に押し上げるコイルスプリングが設けてある鋼管引き抜き用スピアである。
また、引き抜こうとする地中に設置されている鋼管内にテーパ作用によって外部に拡張するジョーを有するスピアを挿入して鋼管の内壁に固定し、振動を加えながら引き揚げることによって鋼管を引き抜く方法である。 A main body having a coupling at the upper end portion, a slider having a downwardly expanding taper that moves up and down by a screw action is provided at the lower portion of the main body, and a jaw that extends outward by the taper of the slider is provided outside the slider. The jaw is provided with teeth on the outer surface side and a friction spring for preventing rotation, and a nose is provided at the tip of the main body. The nose is a steel pipe drawing spear provided with a coil spring that pushes the jaw upward.
Also, it is a method of pulling out a steel pipe by inserting a spear having a jaw that expands outside by a taper action into a steel pipe installed in the ground to be pulled out, fixing it to the inner wall of the steel pipe, and pulling it up while applying vibration. .

鋼管内に本発明のスピアを挿入し、鋼管内壁にスピアのテーパを利用して強固に固定し、適宜の振動を加えながら引き揚げることによって簡単に、また、効率よく地中に設置されている鋼管を引き抜くことができる。
ボーリング用のケーシングのみでなく、鋼管杭等の引き抜きにも応用することができる。 A steel pipe that is easily and efficiently installed in the ground by inserting the spear of the present invention into the steel pipe, firmly fixing it to the inner wall of the steel pipe using the taper of the spear, and pulling up while applying appropriate vibration Can be pulled out.
It can be applied not only to boring casings but also to pulling steel pipe piles and the like.

スピアの実施例
図１は、本発明の引き抜き用のスピアであり、ボーリングロッドの先端に取り付けて引き抜き対象の鋼管内に挿入し、このスピアを鋼管内壁に押し付け、鋼管を地中から引き抜き回収するものである。
スピア１の本体１０の上端部にはボーリングロッド２と接続するカップリング１１が設けてあり、上部側面にはスピア１を鋼管内に挿入する際のフレを防止するためのガイド１２が設けてある。本体１０の下部は小径としてあり、上部より細くしてあると共に、テーパ３１を有するスライダ３を上下動させるためのネジ３０が外周面に設けてある。 Embodiment of Spear FIG. 1 is a drawing spear of the present invention, which is attached to the tip of a boring rod and inserted into a steel pipe to be drawn, and this spear is pressed against the inner wall of the steel pipe, and the steel pipe is pulled out and collected from the ground. Is.
A coupling 11 connected to the boring rod 2 is provided at the upper end portion of the main body 10 of the spear 1, and a guide 12 for preventing flare when the spear 1 is inserted into the steel pipe is provided on the upper side surface. . The lower part of the main body 10 has a small diameter, is made thinner than the upper part, and a screw 30 for moving the slider 3 having the taper 31 up and down is provided on the outer peripheral surface.

スライダ３は、四角断面で本体１０のネジ３０にかみ合う内ネジが設けてあり、角部が下拡がりのテーパ３１としてある。鋼管径が大きな場合は、多角形断面を有している。スライダ３の各辺に対応した複数個のジョー４が上下動可能に設けてあり、スライダ３の下拡がりテーパに対応したテーパが形成してある。ジョー４の外面には鋼管内壁に食いつかせるための歯４０が複数形成してある。また、中央には凹部４１が形成してあり、板バネからなるフリクションスプリング４２が固定してある。このフリクションスプリング４２は、本体１０の外周面より僅かに突出させてあり、引き抜き対象のケーシング内壁面に押し当てられ、その摩擦抵抗によってジョー４及びスライダ３が回転するのを防止するものである。   The slider 3 is provided with an internal screw that engages with the screw 30 of the main body 10 in a square cross section, and has a taper 31 with a corner portion expanding downward. When the steel pipe diameter is large, it has a polygonal cross section. A plurality of jaws 4 corresponding to each side of the slider 3 are provided so as to be movable up and down, and a taper corresponding to the downward expanding taper of the slider 3 is formed. A plurality of teeth 40 are formed on the outer surface of the jaw 4 to bite the inner wall of the steel pipe. A recess 41 is formed in the center, and a friction spring 42 made of a leaf spring is fixed. The friction spring 42 slightly protrudes from the outer peripheral surface of the main body 10 and is pressed against the inner wall surface of the casing to be pulled out to prevent the jaw 4 and the slider 3 from rotating due to the frictional resistance.

本体１０の下部先端にはノーズ１３が固定してあり、先細りとした先端ガイド１４がノーズ１３を包囲しており、鋼管２１への挿入を容易にしている。
ノーズ１３にはコイルスプリング３２が設けてあり、コイルスプリング３２の上端に設けた押し上げ体３３がコイルスプリング３２の反発力でジョー４を上方向に押し上げている。 A nose 13 is fixed to the lower end of the main body 10, and a tapered tip guide 14 surrounds the nose 13, facilitating insertion into the steel pipe 21.
The nose 13 is provided with a coil spring 32, and a push-up body 33 provided at the upper end of the coil spring 32 pushes the jaw 4 upward by the repulsive force of the coil spring 32.

次に、スピア１の動作を説明する。
図３に示すように、ボーリングロッド２の先端にスピア１を取り付け、鋼管２１内に挿入する。
図２（１）に示すように、スライダ３を最下部に位置させた状態でボーリングロッド２の先端に連結して鋼管２１内に挿入する。ジョー４の板バネは鋼管２１の内壁に軽く接触しながら所定の深度に到達する。
図２（２）に示すように、ボーリングロッド２を回転してスピア本体１０を回転させ、ネジ３０の作用によってスライダ３を本体１０に対して上昇させる。
フリクションスプリング４２が鋼管２１の内壁に押し当てられており、その摩擦抵抗によってジョー４及びスライダ３がロッドの回転に伴って共回りするのが防止される。 Next, the operation of the spear 1 will be described.
As shown in FIG. 3, the spear 1 is attached to the tip of the boring rod 2 and inserted into the steel pipe 21.
As shown in FIG. 2 (1), the slider 3 is connected to the tip of the boring rod 2 in a state where the slider 3 is positioned at the lowermost position, and is inserted into the steel pipe 21. The leaf spring of the jaw 4 reaches a predetermined depth while lightly contacting the inner wall of the steel pipe 21.
As shown in FIG. 2 (2), the boring rod 2 is rotated to rotate the spear body 10, and the slider 3 is raised with respect to the body 10 by the action of the screw 30.
The friction spring 42 is pressed against the inner wall of the steel pipe 21, and the frictional resistance prevents the jaw 4 and the slider 3 from rotating together with the rotation of the rod.

スライダ３が上昇することによってテーパ作用によりジョー４は外側に押し出されて鋼管２１の内壁に押し付けられ、ジョー４の歯４０が鋼管２１の内壁に食い込む。
図２（３）に示すように、ボーリングロッド２を徐々に引き揚げてジョー４を鋼管２１の内壁に完全に食い込ませ、スピア１と鋼管２１を一体化させる。ボーリングロッド２を引き揚げることによって鋼管２１を引き抜くことができるようになる。
引き揚げと同時にボーリングロッドに地質に応じて１５〜１５０Ｈｚの振動を加えることによって鋼管外周と周辺地層との摩擦を軽減し、引き抜き易くする。 As the slider 3 rises, the jaw 4 is pushed outward by the taper action and pressed against the inner wall of the steel pipe 21, and the teeth 40 of the jaw 4 bite into the inner wall of the steel pipe 21.
As shown in FIG. 2 (3), the boring rod 2 is gradually lifted to completely bite the jaw 4 into the inner wall of the steel pipe 21, and the spear 1 and the steel pipe 21 are integrated. By pulling up the boring rod 2, the steel pipe 21 can be pulled out.
Simultaneously with the lifting, vibrations of 15 to 150 Hz are applied to the boring rod according to the geology to reduce the friction between the outer periphery of the steel pipe and the surrounding geological formation, thereby facilitating the extraction.

スピアの位置の変更をする場合は、ボーリングロッド２を押し下げて図２（２）の状態に戻し、ボーリングロッド２を逆回転させてスライダ３を降下させてジョー４の鋼管２１の内壁への食い込みを解放して図２（１）の状態とする。ジョー４はコイルスプリング３２によって押し上げられており、スライダ３のみが降下するのでジョー４は縮径する。ボーリングロッド２を上下させることによって適宜の位置にスピア１を移動させて再セットすることができる。   When changing the position of the spear, the boring rod 2 is pushed down to return to the state shown in FIG. 2 (2), the boring rod 2 is rotated in the reverse direction and the slider 3 is lowered to bite the jaw 4 into the inner wall of the steel pipe 21. To the state shown in FIG. The jaw 4 is pushed up by the coil spring 32, and only the slider 3 is lowered, so that the jaw 4 is reduced in diameter. By moving the boring rod 2 up and down, the spear 1 can be moved to an appropriate position and reset.

鋼管引き抜き作業の実施例
鋼管２１の引き抜きにおいては、図３に示すように回転と振動を付加することができるドリル装置５を使用した。
１５０Ａの鋼管２１が砂層、巨礫を含む砂礫層互層に７０ｍの深さに設置されていたものに対して本発明のスピア１を鋼管内に挿入降下させ、鋼管の内壁にスピア１を深度２０ｍの位置にチャッキングした。砂層、巨礫を含む砂礫層互層に設置されていた１５０Ａの鋼管に対して１００〜１５０Ｈｚの振動を付加しながら引き揚げたところ、無振動では引き抜き不能であった鋼管は問題なく引き抜くことができた。 Example of steel pipe drawing operation In drawing the steel pipe 21, a drill device 5 capable of applying rotation and vibration was used as shown in FIG.
The spear 1 of the present invention is inserted and lowered into the steel pipe with respect to the 150A steel pipe 21 installed at a depth of 70 m in the sand layer and the gravel layer containing boulders, and the spear 1 is 20 m deep on the inner wall of the steel pipe. Chucked into position. When the steel pipe of 150A, which was installed in the sand layer and the gravel layer including the gravel, was pulled up while applying vibration of 100 to 150 Hz, the steel pipe that could not be pulled out without vibration could be pulled out without any problem.

本発明のスピアの正面断面図及びＡ−Ａ線横断面図。The front sectional view and AA line transverse sectional view of the spear of the present invention. 本発明のスピアの作用説明図。Action | operation explanatory drawing of the spear of this invention. 本発明の引き抜き方法の説明図。Explanatory drawing of the drawing method of this invention.

符号の説明Explanation of symbols

１ スピア
１０ 本体
１１ カップリング
１２ ガイド
１３ ノーズ
１４ 先端ガイド
２ ボーリングロッド
２１ 鋼管
３ スライダ
３１ テーパ
３２ コイルスプリング
４ ジョー
４０ 歯
４１ 凹部
４２ フリクションスプリング DESCRIPTION OF SYMBOLS 1 Spear 10 Main body 11 Coupling 12 Guide 13 Nose 14 Tip guide 2 Boring rod 21 Steel pipe 3 Slider 31 Taper 32 Coil spring 4 Jaw 40 Tooth 41 Recess 42 Friction spring

Claims (5)

上端部にカップリングを有する本体、本体下部にはネジ作用で上下動する下拡がりのテーパを有するスライダが設けてあり、スライダの外側にはスライダのテーパによって外部に拡張するジョーが設けてあり、ジョーは外面側に歯が設けてあると共に回転防止用のフリクションスプリングが設けてあり、本体の先端部にはノーズが設けてあり、ノーズにはジョーを上に押し上げるコイルスプリングが設けてある鋼管引き抜き用スピア。 A main body having a coupling at the upper end, a slider having a downwardly expanding taper that moves up and down by a screw action is provided at the lower part of the main body, and a jaw that extends outside by the taper of the slider is provided outside the slider. The jaw is provided with teeth on the outer surface and a friction spring for preventing rotation, a nose is provided at the tip of the main body, and a coil spring that pushes the jaw upward is provided on the nose. For spear. 請求項１において、先端側にはノーズを包囲する先細りの先端ガイドが設けてあり、上端には本体外周にガイドが設けてある鋼管内でリリース可能な鋼管引き抜き用スピア。 The steel pipe pulling spear according to claim 1, wherein a tapered tip guide surrounding the nose is provided on the tip side, and the upper end is releasable within a steel pipe provided with a guide on the outer periphery of the main body. 請求項１または２のいずれかに記載のスピアを地中に設置されている鋼管に挿入して鋼管の内壁に固定し、振動を加えながら引き揚げる鋼管の引き抜き方法。 A method of pulling out a steel pipe, wherein the spear according to claim 1 is inserted into a steel pipe installed in the ground, fixed to the inner wall of the steel pipe, and pulled up while applying vibration. 請求項１または２の鋼管引き抜き用スピアをボーリングロッドの先端に連結して地中に設置されている鋼管に挿入し、ボーリングロッドを回転してジョーを外側に押し出して鋼管内壁に食い込ませ、ボーリングロッドに振動を付加しながら引き揚げる鋼管の引き抜き方法。 The spear for pulling out a steel pipe according to claim 1 or 2 is connected to the tip of a boring rod and inserted into a steel pipe installed in the ground, and the boring rod is rotated to push the jaws outward to bite into the inner wall of the steel pipe. A method of pulling a steel pipe that is pulled up while applying vibration to the rod. 請求項３または４において、振動数が１５〜１５０Ｈｚである鋼管の引き抜き方法。 5. The method for drawing a steel pipe according to claim 3 or 4, wherein the vibration frequency is 15 to 150 Hz.
JP2006289147A 2006-10-24 2006-10-24 Steel pipe drawing spear and steel pipe drawing method Active JP4662907B2 (en)

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CN108425361B (en) * 2018-05-09 2023-09-22 上海建工四建集团有限公司 Pile pulling device and application method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56105018A (en) * 1980-01-23 1981-08-21 Sankyo Kogyo Kk Catching mechanism for cylindrical body of cylindrical body drawing device
JPS58153818A (en) * 1982-03-09 1983-09-13 Kubota Ltd Drawing of existing steel tubular pile

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56105018A (en) * 1980-01-23 1981-08-21 Sankyo Kogyo Kk Catching mechanism for cylindrical body of cylindrical body drawing device
JPS58153818A (en) * 1982-03-09 1983-09-13 Kubota Ltd Drawing of existing steel tubular pile

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