JP7177537B1 - How to remove underground ultra-high voltage transmission cables - Google Patents

How to remove underground ultra-high voltage transmission cables Download PDF

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JP7177537B1
JP7177537B1 JP2021161779A JP2021161779A JP7177537B1 JP 7177537 B1 JP7177537 B1 JP 7177537B1 JP 2021161779 A JP2021161779 A JP 2021161779A JP 2021161779 A JP2021161779 A JP 2021161779A JP 7177537 B1 JP7177537 B1 JP 7177537B1
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典夫 大槻
浩二 山岡
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五十嵐工業株式会社
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Abstract

【課題】地中超高圧送電ケーブルを強い引き力で効率良く安全に撤去する方法を提供する。【解決手段】マンホール（Ｍ）の土間（Ｍ２）に仮フック（１）を設け、前記仮フック（１）の地中超高圧送電ケーブル（Ｃ）方向に向かって油圧ジャッキ（２）を接続し、さらに、前記油圧ジャッキ（２）に前記送電ケーブルの終端（３）を接続し、ついで前記油圧ジャッキ（２）を駆動し、その引き力により、前記送電ケーブル（Ｃ）を管路（Ｐ）から前記マンホール（Ｍ）に引き出す。【選択図】図３A method for efficiently and safely removing an underground ultra-high voltage power transmission cable with a strong pulling force is provided. A temporary hook (1) is provided on the earth floor (M2) of the manhole (M), a hydraulic jack (2) is connected to the temporary hook (1) in the direction of the underground ultra-high voltage power transmission cable (C), Furthermore, the end (3) of the power transmission cable is connected to the hydraulic jack (2), then the hydraulic jack (2) is driven, and the power transmission cable (C) is pulled from the pipeline (P) by the pulling force thereof. Pull out to the manhole (M). [Selection drawing] Fig. 3

Description

本発明は、マンホールとマンホールをつなぐ地中の管路に布設された地中超高圧送電ケーブルの撤去方法に関わり、さらに詳しくは、マンホールの土間に設けた仮フックと該仮フックに接続した油圧ジャッキにより得られる強い引き力による、効率の良い安全性の高い地中超高圧送電ケーブルの撤去方法の提供にある。 The present invention relates to a method for removing an underground ultra-high voltage power transmission cable laid in an underground conduit connecting manholes, and more specifically, a temporary hook provided in the earth of the manhole and a hydraulic jack connected to the temporary hook. To provide an efficient and highly safe method for removing an underground ultra-high voltage power transmission cable by a strong pulling force obtained by

マンホールとマンホールをつなぐ地中の管路に布設され長時間経過した地中超高圧送電ケーブルを撤去するためには、当該ケーブルを側圧および自重圧に抗して管路からマンホールに引き出すための強い引き力を要するため、様々な撤去方法が検討されてきた。
マンホール内の既設のフックの反力を用いる方法も検討されたが、既設のフックでは管路に布設され長時間経過した地中超高圧送電ケーブルを引き出すための引き力に対し強度が十分ではなく、また、管路口とフックが直線状にない場合、フックが存在しない場合等があり、既設のフックは、地中超高圧送電ケーブルの撤去に用いるには十分な設備ではなかった。 In order to remove an underground super-high voltage power transmission cable that has been installed in an underground conduit that connects manholes and has been used for a long time, a strong pull is required to pull the cable from the conduit to the manhole against lateral pressure and self-weight pressure. Since it requires force, various removal methods have been examined.
A method using the reaction force of the existing hooks in the manhole was also considered, but the existing hooks were not strong enough to withstand the pulling force required to pull out the underground ultra-high voltage power transmission cables that had been installed in the pipeline for a long time. In addition, there are cases where the conduit opening and the hook are not in a straight line, or where the hook does not exist, etc., and the existing hook was not sufficient equipment for removing the underground ultra-high voltage power transmission cable.

上記の欠点に対し、特許文献１では、管路口部又は壁面にアダプタ（Ａ）を装着し、このアダプタに２組以上並列に配置された油圧シリンダ（２４、２５）を装着し、強い引き力を得る手段が提案されている（図１参照）。
壁面にアダプタを装着した場合、アダプタの装着方向と引き力の方向が真逆となり、アダプタが壁面から勢いよくすっぽ抜け、それがマンホール内の作業員に当たって大怪我を負わせる危険性が存在する。
管路口部にアダプタを装着した場合、管路口部付近の壁面は、管路の空洞の存在により、強度が他の壁面部分に比べ劣り、アダプタに強い反力がかかることで、壁面が破損する危険性が存在する。 To address the above drawbacks, in Patent Document 1, an adapter (A) is attached to the mouth of a pipeline or a wall surface, and two or more sets of hydraulic cylinders (24, 25) arranged in parallel are attached to this adapter to provide a strong pulling force. is proposed (see FIG. 1).
When the adapter is attached to the wall, the direction in which the adapter is attached and the direction of the pulling force are opposite to each other, and there is a danger that the adapter will suddenly come off the wall and hit the worker inside the manhole, causing serious injury. .
When an adapter is attached to the mouth of a pipeline, the strength of the wall near the mouth of the pipeline is inferior to that of other wall parts due to the presence of cavities in the pipeline. Danger exists.

特許文献２では、既設フック（Ｆ）の反力を用いる手段が提案されているが（図２参照）、これも上述のとおり、必要な引き力に対し強度が十分ではなく、壁面に備わる既設フックを用いることで、フックが壁面から勢いよくすっぽ抜け、それがマンホール内の作業員に当たって大怪我を負わせる危険性が同様に存在する。 Patent Document 2 proposes a means using the reaction force of the existing hook (F) (see FIG. 2), but as described above, this also does not have sufficient strength for the required pulling force, and the existing hook (F) provided on the wall is not sufficient. With the use of hooks, there is likewise the risk of the hooks snapping off the wall with force and hitting workers in the manhole and causing serious injury.

特開昭６１―１８０５０５号公報JP-A-61-180505 特開平１０―８００２９号公報JP-A-10-80029

本発明は、上記事情に鑑み、マンホールの土間に仮フックを設け、前記仮フックの地中超高圧送電ケーブル方向に向かって油圧ジャッキを接続し、さらに、前記油圧ジャッキに前記送電ケーブルの終端を接続し、ついで前記油圧ジャッキを駆動することで、強い引き力を得、効率良くかつ安全に、前記送電ケーブルを前記管路から前記マンホールに引き出すことのできる地中超高圧送電ケーブル撤去方法を提供せんとする。 In view of the above circumstances, the present invention provides a temporary hook in the dirt floor of a manhole, connects a hydraulic jack in the direction of the underground ultra-high voltage power transmission cable of the temporary hook, and connects the end of the power transmission cable to the hydraulic jack. Then, by driving the hydraulic jack, a strong pulling force is obtained to efficiently and safely draw out the power transmission cable from the conduit to the manhole. do.

請求項１に係る発明は、マンホールとマンホールとをつなぐ地中の管路に布設されたまま長時間経過した地中超高圧送電ケーブルを撤去する方法であって、
一、予め両端が切断された、撤去を要する前記送電ケーブルの両端部のうち終端を有するマンホールの土間に仮フックを設ける工程と、
二、前記仮フックに油圧ジャッキを接続する工程と、
三、前記油圧ジャッキに前記送電ケーブルの終端を接続する工程と、
四、前記油圧ジャッキを駆動し、その引き力により、前記送電ケーブルを側圧および自重圧に抗して前記管路から前記マンホールに引き出す、縁切り工程と、
を有することを特徴とする地中超高圧送電ケーブル撤去方法に関する。 The invention according to claim 1 is a method for removing an underground ultra-high voltage power transmission cable that has been installed in an underground conduit connecting manholes for a long time, comprising:
1. A step of providing a temporary hook in the soil of a manhole having a terminal end of both ends of the power transmission cable that has been cut in advance and needs to be removed;
2. A step of connecting a hydraulic jack to the temporary hook;
3. connecting the end of the power transmission cable to the hydraulic jack;
4. A hemming step of driving the hydraulic jack and drawing the power transmission cable from the conduit to the manhole against side pressure and self-weight pressure by its pulling force;
It relates to an underground ultra-high voltage power transmission cable removal method characterized by having

請求項２に係る発明は、前記油圧ジャッキを複数台直列に接続して構成する、請求項１に記載の地中超高圧送電ケーブル撤去方法に関する。 The invention according to claim 2 relates to the method for removing an underground extra-high voltage power transmission cable according to claim 1, wherein a plurality of hydraulic jacks are connected in series.

請求項３に係る発明は、前記方法により前記管路から引き出した前記送電ケーブルを地上の撤去車で巻き取る、地中超高圧送電ケーブル撤去方法に関する。 The invention according to claim 3 relates to a method for removing an underground ultra-high voltage power transmission cable, wherein the power transmission cable pulled out from the pipeline by the method is wound by a removal vehicle on the ground.

請求項１に係る発明によれば、予め両端が切断された、撤去を要する前記送電ケーブルの両端部のうち終端を有するマンホールの土間に、地中超高圧送電ケーブルの強い引き力の反力の大きさに耐えることのできる仮フックを設け、前記仮フックに強い引き力を実現する油圧ジャッキを接続し、前記油圧ジャッキに前記送電ケーブルの終端を接続し、油圧ジャッキを駆動させることで、地中超高圧送電ケーブルを側圧および自重圧に抗して縁切りし、管路からマンホールに効率良く引き出し、撤去することができる。
仮フックを固定する複数のアンカーボルトの打ち込み方向が、仮フックが油圧ジャッキから受ける反力の方向とほぼ直交するため、複数のアンカーボルトが反力に対し鉤爪のような役割を果たし、仮フックが突然勢いよくすっぽ抜け、それがマンホール内の作業員に当たるという危険性から解放される。 According to the invention according to claim 1, the magnitude of the reaction force of the strong pulling force of the underground ultra-high voltage power transmission cable is placed in the earth of the manhole having the terminal end of the power transmission cable that has been cut at both ends in advance and needs to be removed. By providing a temporary hook that can withstand high pressure, connecting a hydraulic jack that realizes a strong pulling force to the temporary hook, connecting the end of the power transmission cable to the hydraulic jack, and driving the hydraulic jack, A high-voltage power transmission cable can be cut off against side pressure and self-weight pressure, and can be efficiently pulled out from a conduit to a manhole and removed.
Since the driving direction of the multiple anchor bolts that fix the temporary hook is almost perpendicular to the direction of the reaction force that the temporary hook receives from the hydraulic jack, the multiple anchor bolts act like claws against the reaction force, and the temporary hook is secured. is released from the danger of suddenly coming out with force and striking a worker inside the manhole.

請求項２に係る発明によれば、複数台の油圧ジャッキを直列に接続することによりさらに強い油圧ジャッキの引き力を得て、地中超高圧送電ケーブルを側圧および自重圧に抗して管路からマンホールに効率良く安全に引き出し、撤去することができる。 According to the invention according to claim 2, by connecting a plurality of hydraulic jacks in series, a stronger pulling force of the hydraulic jacks is obtained, and the underground ultra-high voltage power transmission cable is removed from the pipeline against the side pressure and self-weight pressure. Efficiently and safely pulled out and removed from a manhole.

請求項３に係る発明によれば、前記方法により、前記マンホールに効率良く安全に引き出した地中超高圧送電ケーブルを地上の撤去車で巻き取ることで、撤去することができる。 According to the third aspect of the present invention, the underground super-high voltage power transmission cable pulled out to the manhole efficiently and safely can be removed by winding it with a removal vehicle on the ground.

従来の地中超高圧送電ケーブル撤去方法の外観図である。It is an external view of the conventional method for removing an underground ultra-high voltage power transmission cable. 従来の地中超高圧送電ケーブル撤去方法の外観図である。It is an external view of the conventional method for removing an underground ultra-high voltage power transmission cable. 本発明の地中超高圧送電ケーブル撤去方法の外観図である。1 is an external view of a method for removing an underground ultra-high voltage power transmission cable according to the present invention; FIG. 油圧ジャッキの一方の端に仮フックを接続し、他端に地中超高圧送電ケーブルを接続した状態を示す外観図である。It is an external view which shows the state which connected the temporary hook to one end of the hydraulic jack, and connected the underground extra-high-voltage power transmission cable to the other end. 仮設フックの（１）平面図、（２）正面図、（３）右側面図であり、正面図では、参考としてアンカーボルトを図示している。They are (1) a top view of a temporary hook, (2) a front view, and (3) a right side view, and the front view shows an anchor bolt for reference.

以下、本発明の一実施形態について図面を参照しながら詳述する。
かかる実施形態に示す規格、数値等は例示に過ぎず、本発明を限定するものではなく、本発明に直接関係の無い要素については図示を省略する。 An embodiment of the present invention will be described in detail below with reference to the drawings.
The standards, numerical values, etc. shown in these embodiments are merely examples and do not limit the present invention, and elements that are not directly related to the present invention are omitted from the illustration.

マンホール開口部（Ｍ１）に手摺等の保安設備を設置し、作業員は、ガス検知・換気等に注意しながら、安全にマンホール（Ｍ）に入坑する。
本発明の実施にあたり、各所に配置された作業員は、適宜無線通話で連絡を取り合い、安全に作業を進める。 Safety equipment such as handrails will be installed at the manhole opening (M1), and workers will safely enter the manhole (M) while paying attention to gas detection and ventilation.
In carrying out the present invention, the workers stationed in various places keep in touch with each other by radio communication as appropriate and carry out the work safely.

マンホール（Ｍ）とマンホール（Ｍ’）をつなぐ地中の管路（Ｐ）に布設され長時間経過した地中超高圧送電ケーブル（Ｃ）に対し、ケーブルの縁切りを行い、始端部及び終端部を形成する。
地中超高圧送電ケーブル（Ｃ）は、あらかじめ切断されている場合がある。 For the underground super-high voltage power transmission cable (C) that has been installed in the underground conduit (P) connecting the manhole (M) and the manhole (M') and has been used for a long time, cut the edge of the cable and cut the beginning and end. Form.
The underground extra-high voltage power transmission cable (C) may be cut in advance.

マンホール（Ｍ）の土間（Ｍ２）に、仮フック（１）を、複数のアンカーボルト（Ｂ）により強力に固定する。
仮フック（１）に、反力に抗する十分な耐性を与えるため、仮フック（１）の材質を、例えば、ステンレス鋼（ＳＳ４９０）とすることや、アンカーボルト（Ｂ）の打ち込みに先立ち、土間にコンクリート（Ｃｏ）打設を施す手立てを採り得る。
２０ｔの反力に耐えることができる仮フック（１）を設置する。 A temporary hook (1) is strongly fixed to an earth floor (M2) of a manhole (M) by a plurality of anchor bolts (B).
In order to give the temporary hook (1) sufficient resistance against the reaction force, the material of the temporary hook (1) is, for example, stainless steel (SS490), and prior to driving the anchor bolt (B), Concrete (Co) placement in the soil can be taken.
Install a temporary hook (1) that can withstand a reaction force of 20 tons.

仮フックに油圧ジャッキ（２）を、クレビス（ｃｌ）を介して取り付ける。
必要な引き力に応じ、複数台の油圧ジャッキ（２）を、クレビス（ｃｌ）を介し直列に連結する。
油圧ジャッキ（２）に油圧ホース（図示せず）を接続し、その油圧ホースの他端に油圧ポンプ（図示せず）を連結し、油圧ジャッキ（２）の駆動力を得る。 Attach the hydraulic jack (2) to the temporary hook through the clevis (cl).
Several hydraulic jacks (2) are connected in series via clevises (cl) according to the pulling force required.
A hydraulic hose (not shown) is connected to the hydraulic jack (2), and a hydraulic pump (not shown) is connected to the other end of the hydraulic hose to obtain driving force for the hydraulic jack (2).

地中超高圧送電ケーブル（Ｃ）の終端（３）にプーリングアイ（ＰＹ）を取り付け、油圧ジャッキの他端（４）とプーリングアイ（ＰＹ）をクレビス（ｃｌ）を介して連結する。 A pooling eye (PY) is attached to the terminal (3) of the underground ultra-high voltage transmission cable (C), and the other end (4) of the hydraulic jack and the pooling eye (PY) are connected via a clevis (cl).

油圧ポンプの計器を注視しながら、油圧ジャッキ（２）に引き力を与え、合計１５ｔの引き力により前記送電ケーブル（Ｃ）を引き抜く。
１回のプーリングアイ（ＰＹ）の取付けで油圧ジャッキ（２）を１～４台直列に接続し引抜き、油圧ジャッキ（２）の台数を減らしながらできるだけ長く引き抜く。
引き出した前記送電ケーブル（Ｃ）の縁切りを行いながら、プーリングアイ（ＰＹ）の再取付け、油圧ポンプの再駆動により、撤去車（Ｒ）による前記送電ケーブル（Ｃ）の巻き取りができる張力以下になるまで前記送電ケーブル（Ｃ）の引き出しを繰り返す。
撤去車（Ｒ）により前記送電ケーブル（Ｃ）の巻き取りを行う。
場合によっては、ウインチ車（Ｗ）により前記送電ケーブル（Ｃ）を引き戻す作業が発生する。 A pulling force is applied to the hydraulic jack (2) while watching the gauge of the hydraulic pump, and the power transmission cable (C) is pulled out with a total pulling force of 15 tons.
One to four hydraulic jacks (2) are connected in series and pulled out by installing the pulling eye (PY) once, and the hydraulic jacks (2) are pulled out as long as possible while reducing the number of hydraulic jacks (2).
While cutting the edge of the pulled out power transmission cable (C), reinstall the pooling eye (PY) and re-drive the hydraulic pump so that the power transmission cable (C) can be wound up by the removal vehicle (R). Repeat pulling out the power transmission cable (C) until
The power transmission cable (C) is wound by the removal vehicle (R).
In some cases, the work of pulling back the power transmission cable (C) is required by the winch vehicle (W).

一例として、油圧ジャッキ（２）として、株式会社大阪ジャッキ製作所製のＥ形パワージャッキ、クレビス（ｃｌ）として、同社のＥシリーズ用のクレビス、油圧ポンプとして、同社のＧ形油圧ポンプを使用することができる。 As an example, the hydraulic jack (2) is an E-type power jack manufactured by Osaka Jack Mfg. Co., Ltd., the clevis (cl) is for the company's E series, and the hydraulic pump is a G-type hydraulic pump. can be done.

本発明は、マンホールとマンホールをつなぐ地中の管路に布設された地中超高圧送電ケーブルの撤去方法に利用することができる。
特に、本発明によれば、仮フックを別途に設け、強い引き力を実現できることから、地中超高圧送電ケーブルを側圧および自重圧に抗して縁切りし、管路からマンホールに効率良く引き出し、撤去することができる。
INDUSTRIAL APPLICATION This invention can be utilized for the removal method of the underground super-high-voltage power transmission cable laid in the underground pipeline which connects manholes.
In particular, according to the present invention, since a temporary hook can be provided separately and a strong pulling force can be realized, the underground ultra-high voltage power transmission cable can be cut against the side pressure and self-weight pressure, efficiently pulled out from the conduit to the manhole, and removed. can do.

Ｃ：地中超高圧送電ケーブル
Ｍ：マンホール
Ｍ’：マンホール
Ｍ２：土間
Ｐ：管路
１：仮フック
２：油圧ジャッキ
３：地中超高圧送電ケーブルの終端 C: Underground ultra-high voltage power transmission cable M: Manhole M': Manhole M2: Dirt floor P: Pipe line 1: Temporary hook 2: Hydraulic jack 3: Termination of underground ultra-high voltage power transmission cable

Claims (3)

マンホールとマンホールとをつなぐ地中の管路に布設されたまま長時間経過した地中超高圧送電ケーブルを撤去する方法であって、
一、予め両端が切断された、撤去を要する前記送電ケーブルの両端部のうち終端を有するマンホールの土間に仮フックを設ける工程と、
二、前記仮フックに油圧ジャッキを接続する工程と、
三、前記油圧ジャッキに前記送電ケーブルの終端を接続する工程と、
四、前記油圧ジャッキを駆動し、その引き力により、前記送電ケーブルを側圧および自重圧に抗して前記管路から前記マンホールに引き出す、縁切り工程と、
を有することを特徴とする地中超高圧送電ケーブル撤去方法。 A method for removing an underground ultra-high voltage power transmission cable that has been installed in an underground conduit connecting manholes for a long time, comprising:
1. A step of providing a temporary hook in the soil of a manhole having a terminal end of both ends of the power transmission cable that has been cut in advance and needs to be removed;
2. A step of connecting a hydraulic jack to the temporary hook;
3. connecting the end of the power transmission cable to the hydraulic jack;
4. A hemming step of driving the hydraulic jack and drawing the power transmission cable from the conduit to the manhole against side pressure and self-weight pressure by its pulling force;
A method for removing an underground ultra-high voltage power transmission cable, comprising: 前記油圧ジャッキは、複数台の油圧ジャッキを直列に接続して構成する、請求項１に記載の地中超高圧送電ケーブル撤去方法。 2. The method for removing an underground ultra-high voltage power transmission cable according to claim 1, wherein said hydraulic jack comprises a plurality of hydraulic jacks connected in series. 前記管路から引き出した前記送電ケーブルを地上の撤去車で巻き取る、請求項１又は２に記載の地中超高圧送電ケーブル撤去方法。 3. The underground ultra-high voltage power transmission cable removal method according to claim 1 or 2, wherein the power transmission cable pulled out from the pipeline is wound by a ground removal vehicle.
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JPS60234408A (en) * 1984-05-01 1985-11-21 三菱電線工業株式会社 Method of inserting cable into conduit
JPH01252109A (en) * 1988-03-31 1989-10-06 Showa Electric Wire & Cable Co Ltd Base for traction device
JPH0412609A (en) * 1990-04-27 1992-01-17 Nippon Telegr & Teleph Corp <Ntt> Underground cable removing device
JPH0577339A (en) * 1991-09-21 1993-03-30 Dainippon Printing Co Ltd Production of cylindrical sample
JPH0577339U (en) * 1992-03-24 1993-10-22 日本電信電話株式会社 Underground cable removal device stand
JPH06121424A (en) * 1992-10-07 1994-04-28 Nippon Telegr & Teleph Corp <Ntt> Method and apparatus for removing underground cable
JP2004147478A (en) * 2002-10-28 2004-05-20 Airec Engineering Corp Remaining cable removing apparatus
JP2012060746A (en) * 2010-09-07 2012-03-22 Tokyo Electric Power Co Inc:The Pipe line breakup device and method of connecting distribution line
JP2021078323A (en) * 2019-11-13 2021-05-20 東京電力ホールディングス株式会社 Underground cable removal construction method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60234408A (en) * 1984-05-01 1985-11-21 三菱電線工業株式会社 Method of inserting cable into conduit
JPH01252109A (en) * 1988-03-31 1989-10-06 Showa Electric Wire & Cable Co Ltd Base for traction device
JPH0412609A (en) * 1990-04-27 1992-01-17 Nippon Telegr & Teleph Corp <Ntt> Underground cable removing device
JPH0577339A (en) * 1991-09-21 1993-03-30 Dainippon Printing Co Ltd Production of cylindrical sample
JPH0577339U (en) * 1992-03-24 1993-10-22 日本電信電話株式会社 Underground cable removal device stand
JPH06121424A (en) * 1992-10-07 1994-04-28 Nippon Telegr & Teleph Corp <Ntt> Method and apparatus for removing underground cable
JP2004147478A (en) * 2002-10-28 2004-05-20 Airec Engineering Corp Remaining cable removing apparatus
JP2012060746A (en) * 2010-09-07 2012-03-22 Tokyo Electric Power Co Inc:The Pipe line breakup device and method of connecting distribution line
JP2021078323A (en) * 2019-11-13 2021-05-20 東京電力ホールディングス株式会社 Underground cable removal construction method

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