JP2022094094A - Hydraulic pipeline renewal method - Google Patents

Hydraulic pipeline renewal method Download PDF

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JP2022094094A
JP2022094094A JP2020206911A JP2020206911A JP2022094094A JP 2022094094 A JP2022094094 A JP 2022094094A JP 2020206911 A JP2020206911 A JP 2020206911A JP 2020206911 A JP2020206911 A JP 2020206911A JP 2022094094 A JP2022094094 A JP 2022094094A
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steel pipe
opening
existing
hydraulic pipeline
pipe
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晃 池辺
Akira Ikebe
実 浜田
Minoru Hamada
康雄 落合
Yasuo Ochiai
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Sankyu Inc
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Sankyu Inc
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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Abstract

To provide a hydraulic pipeline renewal method that allows reduction in the quantity of materials and equipment carried into a work site and reduction in preparation work, and allows improved work efficiency by dispensing with special work, thereby achieving great shortening of the construction term and cost reduction.SOLUTION: In a hydraulic pipeline renewal method, new steel pipes are installed by removing existing steel pipes 12 from a hydraulic pipeline 11 of a hydraulic power station 10. At a midway point of the hydraulic pipeline 11 in the longitudinal direction, at least upper half of the existing steel pipe 12 is removed from a part of the existing steel pipe 12 exposed to the ground to form an opening 21. Existing steel pipes 12a, 12b downstream and upstream from the opening 21 are divided in the circumferential direction and the axial direction of the existing steel pipes 12a, 12b, and then carried to the opening 21 and removed.SELECTED DRAWING: Figure 1

Description

本発明は、水力発電所における水圧管路の既設鉄管を新規鉄管に更新するための水圧管路更新方法に関する。 The present invention relates to a method for renewing a penstock for renewing an existing steel pipe of a penstock in a hydroelectric power plant to a new steel pipe.

水力発電所における水圧管路が老朽化した際には、既設鉄管の撤去及び新規鉄管の搬入、組立が行われる。これらの作業は、ケーブルクレーン等の大規模な揚重設備を設置したり、水圧管路に沿って複数の作業用構台を仮設したりして行うことができるが、いずれも多くの資機材と日数を必要とし、費用が増大するという問題がある。
一方、特許文献１には、既設配管（鉄管）の上半分を下流側から上流側に向かって順次、所定長さで円周方向（例えば四分円）に分断し、既設配管（下半分）の内面をシューターとして利用して、分断した上半分の各ブロックを下流側に繰り返し運搬した後、既設配管の下半分を上流側から下流側に向かって順次、所定長さで円周方向（例えば四分円）に分断し、残存する下流側の既設配管（下半分）の内面をシューターとして利用して、分断した下半分の各ブロックを下流側に繰り返し運搬する既設配管の撤去方法が開示されている。 When the hydraulic pipeline in a hydroelectric power plant becomes old, existing steel pipes will be removed, new steel pipes will be brought in, and assembly will be carried out. These operations can be carried out by installing large-scale lifting equipment such as cable cranes or by temporarily installing multiple work gantry along the hydraulic pipeline, but all of them are accompanied by many materials and equipment. There is a problem that it requires days and costs increase.
On the other hand, in Patent Document 1, the upper half of the existing pipe (iron pipe) is sequentially divided from the downstream side to the upstream side in the circumferential direction (for example, a quadrant) at a predetermined length, and the existing pipe (lower half) is divided. After repeatedly transporting each block of the divided upper half to the downstream side by using the inner surface of the existing pipe as a shooter, the lower half of the existing pipe is sequentially transported from the upstream side to the downstream side in the circumferential direction (for example) with a predetermined length. Disclosed is a method for removing an existing pipe that is divided into quarters) and the inner surface of the remaining existing pipe (lower half) on the downstream side is used as a shooter to repeatedly transport each block of the divided lower half to the downstream side. ing.

特開昭６１－１９２９８３号公報Japanese Unexamined Patent Publication No. 61-192983

しかしながら、特許文献１には、分断したブロックの滑落防止のための引っ張り手段として、ワイヤーロープ等の索条が記載され、索条の反対側が、巻取機により繰り出されることが記載されているだけで、ブロックを引っ張るために必要な機構及びその他の資機材については具体的に特定されていない。例えば、巻取機としてウインチを使う場合、ウインチそのものが大型の機材であり、現場への搬入及び設置作業が煩雑になるという課題がある。また、引っ張り手段として使用されるワイヤーロープは、折れ曲がり難く、接続や切り離しの作業が煩雑となり、重量もあるので取り扱いが難しいという課題がある。さらに、既設鉄管については、分離、溶断等の手段によりブロック化することが記載されているが、実施するには、切断されるブロックを支えるために、クレーン及びそれを据えるための仮設構台が必要になると考えられる。よって、既設鉄管に沿って幾つかの仮設構台を設置する必要があるが、既設鉄管は地上に露出している部分のみならず、トンネル内に敷設されている部分もあり、作業現場が山の中となるため、現場への資機材の搬入量はなるべく減らすことが好ましい。また、作業（設置）スペースの問題から、大型重機が現場に入ることは難しく、一つ一つの資機材の重量も軽量であることが望ましい。
本発明は、かかる事情に鑑みてなされたもので、作業現場への資機材の搬入量を少なくすると共に、準備作業を削減し、特別な作業を不要にして作業の効率化を図り、大幅な工期短縮とコスト削減を可能とする水圧管路更新方法を提供することを目的とする。 However, Patent Document 1 only describes a rope such as a wire rope as a pulling means for preventing the divided block from slipping, and only describes that the opposite side of the rope is unwound by a winder. Therefore, the mechanism and other materials and equipment required to pull the block have not been specified. For example, when a winch is used as a winder, the winch itself is a large-sized device, and there is a problem that the carrying-in and installation work to the site becomes complicated. Further, the wire rope used as a pulling means is difficult to bend, the work of connecting and disconnecting is complicated, and it is heavy, so that it is difficult to handle. Furthermore, it is described that existing steel pipes are blocked by means such as separation and fusing, but in order to implement this, a crane and a temporary gantry for installing it are required to support the block to be cut. It is thought that it will be. Therefore, it is necessary to install some temporary gantry along the existing steel pipe, but the existing steel pipe has not only the part exposed on the ground but also the part laid in the tunnel, and the work site is mountainous. Therefore, it is preferable to reduce the amount of materials and equipment brought into the site as much as possible. In addition, it is difficult for large heavy machinery to enter the site due to the problem of work (installation) space, and it is desirable that the weight of each material and equipment is light.
The present invention has been made in view of such circumstances, and the amount of materials and equipment brought into the work site is reduced, the preparatory work is reduced, special work is not required, and the work efficiency is improved. The purpose is to provide a hydraulic pipeline renewal method that enables shortening of construction period and cost reduction.

前記目的に沿う本発明に係る水圧管路更新方法は、水力発電所の水圧管路から既設鉄管を除去して新規鉄管を設置する水圧管路更新方法であって、
前記水圧管路の長手方向の途中で、地上に露出している前記既設鉄管の一部から少なくとも該既設鉄管の上半分が除去されて開口部が形成され、該開口部より下流側及び上流側の前記既設鉄管は、該既設鉄管の円周方向及び軸方向に分割されて、前記開口部まで搬送されて除去される。 The method for renewing a penstock according to the present invention according to the above object is a method for renewing a penstock by removing an existing iron pipe from a penstock of a hydroelectric power plant and installing a new penstock.
In the middle of the longitudinal direction of the hydraulic pipe, at least the upper half of the existing steel pipe is removed from a part of the existing steel pipe exposed on the ground to form an opening, and the downstream side and the upstream side from the opening. The existing steel pipe is divided in the circumferential direction and the axial direction of the existing steel pipe, and is conveyed to the opening and removed.

本発明に係る水圧管路更新方法において、前記既設鉄管は、該既設鉄管の円周方向に分割される際に、天井部、両側面部及び底部の４つの部分に分割され、分割された前記天井部及び前記両側面部は前記底部の内周面上を該内周面に沿って搬送されることが好ましい。 In the hydraulic pipeline renewal method according to the present invention, when the existing iron pipe is divided in the circumferential direction of the existing iron pipe, the existing iron pipe is divided into four parts, a ceiling portion, both side surface portions, and a bottom portion, and the divided ceiling is divided. It is preferable that the portion and the both side surface portions are conveyed on the inner peripheral surface of the bottom portion along the inner peripheral surface.

本発明に係る水圧管路更新方法において、前記開口部より下流側の前記既設鉄管は、分割された前記天井部及び前記両側面部が除去された後、前記底部が下流側から上流側に向かって順次軸方向に分割されて、残存する上流側の前記底部の内周面上を該内周面に沿って前記開口部まで搬送されて除去され、前記開口部より上流側の前記既設鉄管は、分割された前記天井部及び前記両側面部が除去された後、前記底部が上流側から下流側に向かって順次軸方向に分割されて、残存する下流側の前記底部の内周面上を該内周面に沿って前記開口部まで搬送されて除去されることが好ましい。 In the hydraulic pipeline renewal method according to the present invention, in the existing iron pipe downstream from the opening, after the divided ceiling portion and both side surface portions are removed, the bottom portion thereof is directed from the downstream side to the upstream side. The existing iron pipe on the upstream side of the opening is removed by being sequentially divided in the axial direction and conveyed on the inner peripheral surface of the bottom portion on the remaining upstream side to the opening along the inner peripheral surface. After the divided ceiling portion and both side surface portions are removed, the bottom portion is sequentially divided in the axial direction from the upstream side to the downstream side, and the remaining downstream side portion is on the inner peripheral surface of the bottom portion. It is preferable that the material is transported to the opening along the peripheral surface and removed.

本発明に係る水圧管路更新方法において、前記開口部は、前記水圧管路の長手方向の途中で、前記既設鉄管の外周をコンクリートで覆って該既設鉄管を固定する既設の中間固定台の下流側及び上流側にそれぞれ形成された下流側開口部位及び上流側開口部位を有し、前記開口部より下流側の前記既設鉄管は、分割されて前記下流側開口部位から取り出され、前記開口部より上流側の前記既設鉄管は、分割されて前記上流側開口部位から取り出されてもよい。 In the method for renewing a penstock according to the present invention, the opening is located downstream of an existing intermediate fixing base for fixing the existing iron pipe by covering the outer periphery of the existing iron pipe with concrete in the middle of the longitudinal direction of the penstock. The existing iron pipe having a downstream opening portion and an upstream opening portion formed on the side and the upstream side, respectively, and the existing iron pipe on the downstream side of the opening is divided and taken out from the downstream opening portion, and is taken out from the opening. The existing iron pipe on the upstream side may be divided and taken out from the opening portion on the upstream side.

本発明に係る水圧管路更新方法において、前記新規鉄管は、前記既設鉄管が除去された後、前記開口部が形成されていた場所から輪切り状態で搬入され、該開口部より下流側及び上流側に順次搬送されて、隣り合う他の前記新規鉄管と連結されることが好ましい。 In the hydraulic pipe renewal method according to the present invention, after the existing steel pipe is removed, the new steel pipe is carried in in a sliced state from the place where the opening was formed, and is downstream and upstream from the opening. It is preferable that the pipes are sequentially conveyed to the new steel pipe and connected to the other adjacent new steel pipes.

本発明に係る水圧管路更新方法において、前記水圧管路の長手方向に沿って仮設される複数の支持台により、前記新規鉄管の搬送を案内することができる。 In the method for renewing a penstock pipe according to the present invention, the transport of the new steel pipe can be guided by a plurality of support stands temporarily provided along the longitudinal direction of the penstock pipe.

本発明に係る水圧管路更新方法において、前記新規鉄管のうち、前記水圧管路の下流側で湾曲して既設の下流側固定台に固定される部分は、円周方向に３分割され、底部壁と、該底部壁の幅方向両側に回動可能に連結された左右の回動壁とを有し、該各回動壁が前記底部壁側に折り畳まれた状態で前記開口部から下流側の設置位置まで搬送されて円管状に組立てられることが好ましい。 In the method for renewing a hydraulic pipeline according to the present invention, the portion of the new iron pipe that is curved on the downstream side of the hydraulic pipeline and fixed to the existing downstream side fixing base is divided into three in the circumferential direction and the bottom portion. It has a wall and left and right rotating walls rotatably connected to both sides in the width direction of the bottom wall, and each rotating wall is folded toward the bottom wall and downstream from the opening. It is preferable that it is transported to the installation position and assembled into a circular tube.

本発明に係る水圧管路更新方法において、前記既設鉄管及び前記新規鉄管の搬送、前記既設鉄管の搬出及び前記新規鉄管の搬入には、共通する１台のクレーンが使用されることが好ましい。 In the hydraulic pipeline renewal method according to the present invention, it is preferable that one common crane is used for transporting the existing steel pipe and the new steel pipe, carrying out the existing steel pipe, and carrying in the new steel pipe.

本発明に係る水圧管路更新方法において、前記既設鉄管及び前記新規鉄管の搬送に、前記クレーンとチェーンブロックが併用されてもよい。 In the hydraulic pipeline renewal method according to the present invention, the crane and the chain block may be used in combination for transporting the existing steel pipe and the new steel pipe.

本発明に係る水圧管路更新方法において、前記既設鉄管のうち、トンネル内に設置されている部分は、該トンネルの天井内面に取り付けられるトンネル用チェーンブロックで吊下げられて分割が行われることが好ましい。 In the hydraulic pipeline renewal method according to the present invention, the portion of the existing steel pipe installed in the tunnel may be suspended by a tunnel chain block attached to the inner surface of the ceiling of the tunnel to be divided. preferable.

本発明に係る水圧管路更新方法において、前記既設鉄管のうち、地上に露出して設置されている部分は、該既設鉄管の外周を囲うように設置される門型フレームに取り付けられた地上用チェーンブロックで吊下げられて分割が行われることが好ましい。 In the hydraulic pipeline renewal method according to the present invention, the portion of the existing steel pipe exposed to the ground and installed is for ground use attached to a portal frame installed so as to surround the outer circumference of the existing steel pipe. It is preferable that the pipe is suspended by a chain block for division.

本発明に係る水圧管路更新方法は、水圧管路の長手方向の途中で、地上に露出している既設鉄管の一部から少なくとも既設鉄管の上半分が除去されて開口部が形成され、開口部より下流側及び上流側の既設鉄管が、既設鉄管の円周方向及び軸方向に分割されて、開口部まで搬送されて除去されるので、水圧管路の全長が長い場合や水圧管路が途中で湾曲している場合でも、既設鉄管の除去作業及び新規鉄管の設置作業を短時間で効率的に行うことができる。 In the method for renewing a penstock pipe according to the present invention, at least the upper half of the existing steel pipe is removed from a part of the existing steel pipe exposed on the ground in the middle of the longitudinal direction of the penstock pipe to form an opening. The existing steel pipes on the downstream and upstream sides of the section are divided in the circumferential direction and the axial direction of the existing steel pipe, and are transported to the opening and removed. Even if it is curved in the middle, the work of removing the existing steel pipe and the work of installing a new steel pipe can be efficiently performed in a short time.

本発明に係る水圧管路更新方法において、既設鉄管が、既設鉄管の円周方向に分割される際に、天井部、両側面部及び底部の４つの部分に分割され、分割された天井部及び両側面部が底部の内周面上を該内周面に沿って搬送される場合、底部を有効利用して、分割された天井部及び両側面部の搬送作業を効率的に行うことができ、別途、シュートや搬送台車等を使用する必要がなく、作業現場への資機材の搬入量を削減することができる。 In the hydraulic pipeline renewal method according to the present invention, when the existing steel pipe is divided in the circumferential direction of the existing steel pipe, it is divided into four parts, a ceiling portion, both side surface portions and a bottom portion, and the divided ceiling portion and both sides. When the face portion is transported on the inner peripheral surface of the bottom along the inner peripheral surface, the bottom portion can be effectively used to efficiently perform the transport work of the divided ceiling portion and both side surface portions. There is no need to use a chute or a transport trolley, and the amount of materials and equipment brought into the work site can be reduced.

本発明に係る水圧管路更新方法において、開口部より下流側の既設鉄管は、分割された天井部及び両側面部が除去された後、底部が下流側から上流側に向かって順次軸方向に分割されて、残存する上流側の底部の内周面上を該内周面に沿って開口部まで搬送されて除去され、開口部より上流側の既設鉄管は、分割された天井部及び両側面部が除去された後、前記底部が上流側から下流側に向かって順次軸方向に分割されて、残存する下流側の底部の内周面上を該内周面に沿って開口部まで搬送されて除去される場合、残存する底部を有効利用して、分割された底部を効率的に搬送することができ、施工性及び省力性に優れる。 In the hydraulic pipeline renewal method according to the present invention, in the existing iron pipe downstream from the opening, after the divided ceiling portion and both side surface portions are removed, the bottom portion is sequentially divided in the axial direction from the downstream side to the upstream side. Then, the remaining inner peripheral surface of the bottom on the upstream side is transported along the inner peripheral surface to the opening and removed, and the existing iron pipe on the upstream side of the opening has a divided ceiling portion and both side surfaces. After being removed, the bottom portion is sequentially divided in the axial direction from the upstream side to the downstream side, and is conveyed on the inner peripheral surface of the remaining downstream bottom portion along the inner peripheral surface to the opening for removal. In this case, the remaining bottom portion can be effectively used to efficiently transport the divided bottom portion, which is excellent in workability and labor saving.

本発明に係る水圧管路更新方法において、開口部が、水圧管路の長手方向の途中で、既設鉄管の外周をコンクリートで覆って既設鉄管を固定する既設の中間固定台の下流側及び上流側にそれぞれ形成された下流側開口部位及び上流側開口部位を有し、開口部より下流側の既設鉄管が、分割されて下流側開口部位から取り出され、開口部より上流側の既設鉄管が、分割されて上流側開口部位から取り出される場合、一部の既設鉄管の外周がコンクリートで覆われて中間固定台で固定されていても、既設鉄管の除去作業を確実かつ効率的に行うことができる。 In the hydraulic pipeline renewal method according to the present invention, the opening is on the downstream side and the upstream side of the existing intermediate fixing base for fixing the existing iron pipe by covering the outer periphery of the existing iron pipe with concrete in the middle of the longitudinal direction of the hydraulic pipeline. The existing iron pipe on the downstream side of the opening is divided and taken out from the downstream opening portion, and the existing iron pipe on the upstream side of the opening is divided. When it is taken out from the opening portion on the upstream side, even if the outer periphery of a part of the existing iron pipe is covered with concrete and fixed by an intermediate fixing table, the removal work of the existing iron pipe can be performed reliably and efficiently.

本発明に係る水圧管路更新方法において、新規鉄管が、既設鉄管が除去された後、開口部が形成されていた場所から輪切り状態で搬入され、開口部より下流側及び上流側に順次搬送されて、隣り合う他の新規鉄管と連結される場合、新規鉄管の設置作業を短時間で効率的に行うことができる。 In the hydraulic pipe renewal method according to the present invention, after the existing steel pipe is removed, the new steel pipe is carried in in a sliced state from the place where the opening was formed, and is sequentially conveyed to the downstream side and the upstream side from the opening. When connected to other adjacent new steel pipes, the installation work of the new steel pipes can be performed efficiently in a short time.

本発明に係る水圧管路更新方法において、水圧管路の長手方向に沿って仮設される複数の支持台により、新規鉄管の搬送を案内する場合、新規鉄管の搬送作業を効率的に行うことができ、省力性に優れる。 In the method for renewing a penstock pipe according to the present invention, when the transport of a new steel pipe is guided by a plurality of support stands temporarily provided along the longitudinal direction of the penstock pipe, the transport work of the new steel pipe can be efficiently performed. It can be done and is excellent in labor saving.

本発明に係る水圧管路更新方法において、新規鉄管のうち、水圧管路の下流側で湾曲して既設の下流側固定台に固定される部分が、円周方向に３分割され、底部壁と、底部壁の幅方向両側に回動可能に連結された左右の回動壁とを有し、各回動壁が底部壁側に折り畳まれた状態で開口部から下流側の設置位置まで搬送されて円管状に組立てられる場合、管路が湾曲していても、新規鉄管を確実に設置位置まで搬送して効率的に設置作業を行うことができる。 In the hydraulic pipeline renewal method according to the present invention, the portion of the new iron pipe that is curved on the downstream side of the hydraulic pipeline and fixed to the existing downstream side fixing base is divided into three in the circumferential direction and is divided into three parts and the bottom wall. It has left and right rotating walls that are rotatably connected to both sides in the width direction of the bottom wall, and each rotating wall is transported from the opening to the installation position on the downstream side in a state of being folded toward the bottom wall. When assembled in a circular tubular shape, even if the pipeline is curved, the new steel pipe can be reliably transported to the installation position and the installation work can be performed efficiently.

本発明に係る水圧管路更新方法において、既設鉄管及び新規鉄管の搬送、既設鉄管の搬出及び新規鉄管の搬入に、共通する１台のクレーンが使用される場合、山中の現場でも設置スペース及び作業スペースを確保して、作業の効率化を図り、大幅な工期短縮とコスト削減を実現することができる。 In the hydraulic pipeline renewal method according to the present invention, when one common crane is used for transporting existing steel pipes and new steel pipes, carrying out existing steel pipes, and carrying in new steel pipes, installation space and work even at sites in the mountains. It is possible to secure space, improve work efficiency, and realize significant shortening of construction period and cost reduction.

本発明に係る水圧管路更新方法において、既設鉄管及び新規鉄管の搬送に、クレーンとチェーンブロックが併用される場合、現場への搬入及び操作が容易なチェーンブロックで作業性を大幅に向上させることができる。 In the hydraulic pipeline renewal method according to the present invention, when a crane and a chain block are used together for transporting an existing steel pipe and a new steel pipe, the workability is greatly improved by the chain block which is easy to carry in and operate at the site. Can be done.

本発明に係る水圧管路更新方法において、既設鉄管のうち、トンネル内に設置されている部分が、トンネルの天井内面に取り付けられるトンネル用チェーンブロックで吊下げられて分割が行われる場合、トンネル内での既設鉄管の分割作業を安全かつ効率的に行うことができる。 In the method for renewing a hydraulic pipeline according to the present invention, when a portion of an existing steel pipe installed in a tunnel is suspended by a tunnel chain block attached to the inner surface of the ceiling of the tunnel and divided, the inside of the tunnel is divided. It is possible to safely and efficiently divide the existing steel pipe in.

本発明に係る水圧管路更新方法において、既設鉄管のうち、地上に露出して設置されている部分が、既設鉄管の外周を囲うように設置される門型フレームに取り付けられた地上用チェーンブロックで吊下げられて分割が行われる場合、地上での既設鉄管の分割作業を安全かつ効率的に行うことができる。 In the hydraulic pipeline renewal method according to the present invention, of the existing steel pipes, the portion exposed on the ground and installed is attached to the portal frame installed so as to surround the outer circumference of the existing steel pipes. When the existing steel pipe is hung from the ground and the division is performed, the division work of the existing steel pipe on the ground can be performed safely and efficiently.

本発明の一実施の形態に係る水圧管路更新方法が適用される水力発電所の水圧管路を示す部分断面側面図である。It is a partial cross-sectional side view which shows the penstock of the hydroelectric power plant to which the penstock renewal method which concerns on one Embodiment of this invention is applied. 同水圧管路更新方法において開口部を形成する工程を示す要部端面図である。It is a main part end view which shows the process of forming an opening in the same hydraulic line renewal method. 同水圧管路更新方法において形成された開口部を示す部分断面側面図である。It is a partial cross-sectional side view which shows the opening formed in the same hydraulic pipeline renewal method. 同水圧管路更新方法において開口部より下流側の既設鉄管の天井部を除去する工程を示す部分断面側面図である。It is a partial cross-sectional side view which shows the process of removing the ceiling part of the existing steel pipe downstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において開口部より下流側の既設鉄管の天井部を除去する工程を示す要部端面図である。It is a main part end view which shows the process of removing the ceiling part of the existing steel pipe downstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法に用いられる搬送用のチェーンブロックを示す要部側断面図である。It is a main part side sectional view which shows the chain block for transport used in the same hydraulic pipeline renewal method. 同水圧管路更新方法において開口部より下流側の既設鉄管の側面部を除去する工程を示す部分断面側面図である。It is a partial cross-sectional side view which shows the process of removing the side surface part of the existing steel pipe downstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において開口部より下流側の既設鉄管の側面部を除去する工程を示す要部端面図である。It is a main part end view which shows the process of removing the side surface part of the existing steel pipe downstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において下流側固定台の内部に円筒状の新規鉄管を設置する工程を示す部分断面側面図である。It is a partial cross-sectional side view which shows the process of installing a new cylindrical steel pipe inside a fixed base on the downstream side in the same hydraulic pipe renewal method. 同水圧管路更新方法において下流側固定台の内部に折り畳み式の新規鉄管を設置する工程を示す要部端面図である。It is a main part end view which shows the process of installing a new foldable steel pipe inside a fixed base on the downstream side in the same hydraulic pipe renewal method. 同水圧管路更新方法において開口部より下流側の既設鉄管の底部を除去する工程を示す要部端面図である。It is a main part end view which shows the process of removing the bottom part of the existing steel pipe downstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において開口部より下流側に新規鉄管を設置する工程を示す部分断面側面図である。It is a partial cross-sectional side view which shows the process of installing a new steel pipe on the downstream side from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において開口部より上流側の既設鉄管の天井部を除去する工程を示す部分断面側面図である。It is a partial cross-sectional side view which shows the process of removing the ceiling part of the existing steel pipe upstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において開口部より上流側の既設鉄管の天井部を除去する工程を示す要部端面図である。It is a main part end view which shows the process of removing the ceiling part of the existing steel pipe upstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において開口部より上流側の既設鉄管の側面部を除去する工程を示す部分断面側面図である。It is a partial cross-sectional side view which shows the process of removing the side surface part of the existing steel pipe upstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において開口部より上流側の既設鉄管の側面部を除去する工程を示す要部端面図である。It is a main part end view which shows the process of removing the side surface part of the existing steel pipe upstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において開口部より上流側の既設鉄管の底部を除去する工程を示す部分断面側面図である。It is a partial cross-sectional side view which shows the process of removing the bottom part of the existing steel pipe upstream from the opening in the same hydraulic pipe renewal method. 同水圧管路更新方法において中間固定台の内部の既設鉄管を除去する工程を示す部分断面側面図である。It is a partial cross-sectional side view which shows the process of removing the existing steel pipe inside the intermediate fixing base in the same hydraulic pipe renewal method. 同水圧管路更新方法において新規鉄管の設置が完了した状態を示す部分断面側面図である。It is a partial cross-sectional side view which shows the state which the installation of a new steel pipe is completed in the same hydraulic pipe renewal method.

続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
本発明の一実施の形態に係る水圧管路更新方法は、図１に示す水力発電所１０における水圧管路１１の既設鉄管１２を新規鉄管に更新する際に用いられるものである。
図１に示すように、水圧管路１１は、上流側の水槽（調整池）１３と下流側の水車（図示せず）との間を接続し、水槽１３に蓄えられた水を水車に供給するものである。既設鉄管１２の一部はトンネル１４内に敷設されている。そして、水圧管路１１（既設鉄管１２）の上流端側、長手方向の途中及び下流端側には、それぞれ既設鉄管１２の外周をコンクリートで覆って既設鉄管１２を固定する既設の上流側固定台１６、中間固定台１７及び下流側固定台１８が設けられている。また、既設鉄管１２の長手方向の要所は、複数の小支台２０により摺動可能に支持されている。 Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood.
The method for renewing a penstock pipe according to an embodiment of the present invention is used when renewing an existing steel pipe 12 of a penstock pipe 11 in a hydroelectric power plant 10 shown in FIG. 1 to a new steel pipe.
As shown in FIG. 1, the penstock line 11 connects between the water tank (regulatory pond) 13 on the upstream side and the water wheel (not shown) on the downstream side, and supplies the water stored in the water tank 13 to the water wheel. It is something to do. A part of the existing steel pipe 12 is laid in the tunnel 14. Then, on the upstream end side, the middle of the longitudinal direction, and the downstream end side of the hydraulic pipe 11 (existing iron pipe 12), the existing upstream side fixing base for fixing the existing iron pipe 12 by covering the outer periphery of the existing iron pipe 12 with concrete, respectively. 16. An intermediate fixing base 17 and a downstream fixing base 18 are provided. Further, the key points in the longitudinal direction of the existing steel pipe 12 are slidably supported by a plurality of small abutments 20.

まず、既設鉄管１２を除去するために、水圧管路１１の長手方向の途中で地上に露出している既設鉄管１２の一部から少なくとも既設鉄管１２の上半分（ここでは、上側の２／３周分であって、図１、図２のハッチング部）が除去されて、図３に示すような開口部２１が形成される。このとき、図１、図３に示すように、水圧管路１１の長手方向の途中が、中間固定台１７で固定されているので、中間固定台１７の下流側及び上流側にそれぞれ下流側開口部位２１ａ及び上流側開口部位２１ｂが形成される。これにより、開口部２１より下流側及び上流側の既設鉄管１２ａ、１２ｂ（下流側固定台１８及び上流側固定台１６で固定されている部分を除く）は、それぞれの円周方向及び軸方向に分割され、下流側開口部位２１ａ及び上流側開口部位２１ｂまで搬送されて下流側開口部位２１ａ及び上流側開口部位２１ｂから取り出される。
なお、開口部２１（下流側開口部位２１ａ及び上流側開口部位２１ｂ）を形成する際に既設鉄管１２から除去される部分は、図１に示すように、予めクレーン２２のブーム２３の先端に昇降可能に取り付けられたフック２４で吊下げられることにより、分割時に落下することがなく、分割後にクレーン２２で吊り上げられて除去される。このとき、開口部２１の近傍であるトンネル１４の上部を整地してクレーン２２を設置することにより、既設鉄管１２の搬出及び新規配管の搬入作業を効率的に行うことができる。クレーンとしては小型移動式クレーン（例えば２５ｔラフタークレーン）が好適に用いられるが、これに限定されるものではなく、作業現場への搬入及び設置が可能な範囲で大型化してもよい。 First, in order to remove the existing steel pipe 12, at least the upper half of the existing steel pipe 12 (here, the upper two-thirds) from a part of the existing steel pipe 12 exposed on the ground in the middle of the longitudinal direction of the penstock line 11. The hatching portion of FIGS. 1 and 2) is removed to form the opening 21 as shown in FIG. At this time, as shown in FIGS. 1 and 3, since the intermediate fixing table 17 is fixed in the middle of the hydraulic line 11 in the longitudinal direction, the downstream opening is opened on the downstream side and the upstream side of the intermediate fixing table 17, respectively. A portion 21a and an upstream opening portion 21b are formed. As a result, the existing iron pipes 12a and 12b on the downstream side and the upstream side of the opening 21 (excluding the portions fixed by the downstream side fixing base 18 and the upstream side fixing base 16) are in the circumferential direction and the axial direction, respectively. It is divided, transported to the downstream opening portion 21a and the upstream opening portion 21b, and taken out from the downstream opening portion 21a and the upstream opening portion 21b.
As shown in FIG. 1, the portion removed from the existing steel pipe 12 when forming the opening 21 (downstream opening portion 21a and upstream opening portion 21b) moves up and down in advance to the tip of the boom 23 of the crane 22. By being hung by the hook 24 that can be attached, it does not fall at the time of division, and is lifted and removed by the crane 22 after the division. At this time, by leveling the upper part of the tunnel 14 near the opening 21 and installing the crane 22, the existing steel pipe 12 can be carried out and the new pipe can be carried in efficiently. As the crane, a small mobile crane (for example, a 25t rough terrain crane) is preferably used, but the crane is not limited to this, and may be increased in size to the extent that it can be carried and installed at the work site.

本実施の形態で、開口部２１を形成するために除去される範囲は、図２に示すように、既設鉄管１２の全周のうち、小支台２０で支持されている下側の１／３の領域に相当する部分を除く、上側の２／３の部分であって、開口部２１（下流側開口部位２１ａ及び上流側開口部位２１ｂ）を形成することにより、後に開口部２１より下流側及び上流側で円周方向及び軸方向に分割される既設鉄管１２ａ、１２ｂがスムーズに搬出されるようにした。なお、開口部（下流側開口部位及び上流側開口部位）の形状及び大きさは、分割された既設鉄管が搬出可能な範囲で適宜、選択することができるが、少なくとも既設鉄管１２の上半分が除去されることが好ましい。 In the present embodiment, as shown in FIG. 2, the range removed to form the opening 21 is the lower 1 / of the entire circumference of the existing iron pipe 12 supported by the small abutment 20. It is an upper two-thirds portion excluding the portion corresponding to the region of 3, and by forming the opening 21 (downstream opening portion 21a and upstream opening portion 21b), it is later downstream from the opening 21. The existing iron pipes 12a and 12b, which are divided in the circumferential direction and the axial direction on the upstream side, are smoothly carried out. The shape and size of the openings (downstream opening portion and upstream opening portion) can be appropriately selected within the range in which the divided existing steel pipe can be carried out, but at least the upper half of the existing steel pipe 12 is used. It is preferable to remove it.

次に、図４、図５に示すように、開口部２１より下流側の既設鉄管１２ａ（ここでは、トンネル１４内に設置されている）の天井部２６（図４、図５のハッチング部）を分割する。このとき、天井部２６は、予めトンネル１４の天井内面２７に取り付けたトンネル用チェーンブロック２８で吊下げられた状態で分割され、分割後に既設鉄管１２ａの底部２９に載置される。また、天井部２６の下側の幅方向両側には、支持部材３０を介してスライドシュー３１が取り付けられ、上面側の幅方向中央部には、図６に示す搬送用のチェーンブロック３３を連結するための連結具３４が取り付けられている。これにより、分割された天井部２６は底部２９の内周面上を内周面に沿って開口部２１までスムーズに搬送され、下流側開口部位２１ａから取り出される。天井部２６の分割及び搬出は上流側から下流側に向かって順次行われ、分割時の軸方向長さは適宜、選択することができる。例えば、最初から下流側開口部位２１ａから取り出すことが可能な長さ毎に天井部２６を分割して順次、上流側に搬送してもよいし、下流側開口部位２１ａの軸方向長さよりも長目（例えば、下流側開口部位２１ａの軸方向長さの２～３倍）に分割した天井部２６を上流側に搬送し、下流側開口部位２１ａの下方で、下流側開口部位２１ａの軸方向長さと同程度の長さに分割を繰り返してもよい。よって、トンネル用チェーンブロック２８及びスライドシュー３１の数と配置は、天井部の分割時の軸方向長さに応じて、適宜、選択することができるが、少なくとも軸方向の２箇所（前後）に左右２つずつ計４つ設置することが好ましい。なお、チェーンブロック３３は、中間固定台１７の周壁部を利用して取り付けることができる。 Next, as shown in FIGS. 4 and 5, the ceiling portion 26 (hatched portion of FIGS. 4 and 5) of the existing steel pipe 12a (here, installed in the tunnel 14) on the downstream side of the opening 21. Is divided. At this time, the ceiling portion 26 is divided in a state of being suspended by a tunnel chain block 28 previously attached to the ceiling inner surface 27 of the tunnel 14, and after the division, the ceiling portion 26 is placed on the bottom portion 29 of the existing steel pipe 12a. Further, slide shoes 31 are attached to both sides in the width direction on the lower side of the ceiling portion 26 via support members 30, and a chain block 33 for transport shown in FIG. 6 is connected to the central portion in the width direction on the upper surface side. A connecting tool 34 for the purpose is attached. As a result, the divided ceiling portion 26 is smoothly conveyed on the inner peripheral surface of the bottom portion 29 along the inner peripheral surface to the opening 21, and is taken out from the downstream opening portion 21a. The ceiling portion 26 is divided and carried out sequentially from the upstream side to the downstream side, and the axial length at the time of division can be appropriately selected. For example, the ceiling portion 26 may be divided and sequentially transported to the upstream side for each length that can be taken out from the downstream opening portion 21a from the beginning, or may be longer than the axial length of the downstream opening portion 21a. The ceiling portion 26 divided into eyes (for example, 2 to 3 times the axial length of the downstream opening portion 21a) is transported to the upstream side, and below the downstream opening portion 21a, in the axial direction of the downstream opening portion 21a. The division may be repeated to the same length as the length. Therefore, the number and arrangement of the tunnel chain block 28 and the slide shoe 31 can be appropriately selected according to the axial length when the ceiling portion is divided, but at least at two locations (front and back) in the axial direction. It is preferable to install a total of four, two on each side. The chain block 33 can be attached by using the peripheral wall portion of the intermediate fixing base 17.

以上のようにして既設鉄管１２ａの天井部２６を全て除去した後、図７、図８に示すように、両側面部３５ａ、３５ｂ（図７、図８のハッチング部）を分割する。まず、一方の側面部３５ａが、トンネル用チェーンブロック２８で吊下げられた状態で分割され、分割後に既設鉄管１２ａの底部２９に載置される。このとき、側面部３５ａの外周側の幅方向両側には、スライドシュー３６が取り付けられ、内周側の幅方向中央部には、天井部２６と同様に、連結具３４が取り付けられている。これにより、分割された側面部３５ａは底部２９の内周面上を内周面に沿って開口部２１までスムーズに搬送され、下流側開口部位２１ａから取り出される。ここで、側面部３５ａの軸方向の分割及び搬送の手順については、前述の天井部２６と同様なので説明を省略する。また、他方の側面部３５ｂの分割及び搬送の手順は、側面部３５ａと同様なので説明を省略する。なお、一方の側面部３５ａと他方の側面部３５ｂを軸方向に所定の長さずつ交互に分割して除去することが好ましいが、一方の側面部３５ａを全て除去してから、他方の側面部３５ｂの除去を行うこともできる。
このように、円周方向に分割される既設鉄管１２の底部２９を利用して天井部２６及び両側面部３５ａ、３５ｂを搬送することにより、別途、搬送台車等を使用する必要がなくなり、作業現場への資機材の搬入量を削減することができる。 After removing all the ceiling portions 26 of the existing steel pipe 12a as described above, both side surface portions 35a and 35b (hatched portions in FIGS. 7 and 8) are divided as shown in FIGS. 7 and 8. First, one side surface portion 35a is divided in a state of being suspended by the tunnel chain block 28, and after the division, it is placed on the bottom portion 29 of the existing steel pipe 12a. At this time, slide shoes 36 are attached to both sides in the width direction on the outer peripheral side of the side surface portion 35a, and connecting tools 34 are attached to the central portion in the width direction on the inner peripheral side in the same manner as the ceiling portion 26. As a result, the divided side surface portion 35a is smoothly conveyed on the inner peripheral surface of the bottom portion 29 to the opening 21 along the inner peripheral surface, and is taken out from the downstream opening portion 21a. Here, since the procedure for axially dividing and transporting the side surface portion 35a is the same as that of the ceiling portion 26 described above, the description thereof will be omitted. Further, since the procedure for dividing and transporting the other side surface portion 35b is the same as that for the side surface portion 35a, the description thereof will be omitted. It is preferable that one side surface portion 35a and the other side surface portion 35b are alternately divided and removed by a predetermined length in the axial direction, but after removing all the one side surface portion 35a, the other side surface portion is removed. It is also possible to remove 35b.
In this way, by transporting the ceiling portion 26 and both side surface portions 35a and 35b using the bottom portion 29 of the existing steel pipe 12 divided in the circumferential direction, it is not necessary to separately use a transport trolley or the like, and the work site. It is possible to reduce the amount of materials and equipment brought into the area.

次に、既設鉄管１２のうち、下流側固定台１８で固定されている部分（図７の網掛部）を撤去する。この部分は湾曲しており、下流端側に向かって縮径しているので、下流側固定台１８の内部で周囲のコンクリートと共に解体され、バケツ等で回収されて下流端から搬出される。このとき、水車及び発電機は一時的に撤去されている。
次に、図９に示すように、下流側固定台１８の内部に設置される新規鉄管が、クレーン２２によって開口部２１（下流側開口部位２１ａ）から搬入される。このとき、下流側固定台１８の内部（空洞部）は湾曲しており、下流端側が部分的に縮径しているので、設置場所に応じて、円筒状の新規鉄管３８と、図１０に示す折り畳み式の新規鉄管３９を使い分ける。
新規鉄管３９は、図１０に示すように、円周方向に３分割され、底部壁４０と、底部壁４０の幅方向両側に回動可能に連結された左右の回動壁４１とを有しており、各回動壁４１を底部壁４０側に折り畳むことにより、背を低くすることができるので、円筒状の新規鉄管３８が通過できない場所を通過することができる。よって、新規鉄管３９は、各回動壁４１が底部壁４０側に折り畳まれた状態で、下流側の設置位置まで搬送されて円管状に組立てられる。
新規鉄管３８、３９は、いずれも既設鉄管１２ａの底部２９を利用して下流側固定台１８まで搬送され、搬送には、前述の搬送用のチェーンブロック３３が用いられる。なお、新規鉄管３９は、搬送台車４２に載置することにより、スムーズに搬送することができる。本実施の形態では、チェーンブロック３３を連結するための連結具３４を底部壁４０の上面側の幅方向中央部に取り付けたが、搬送台車に取り付けてもよい。 Next, of the existing steel pipe 12, the portion fixed by the downstream fixing base 18 (the shaded portion in FIG. 7) is removed. Since this portion is curved and the diameter is reduced toward the downstream end side, it is disassembled together with the surrounding concrete inside the downstream side fixing base 18, collected by a bucket or the like, and carried out from the downstream end. At this time, the water turbine and the generator have been temporarily removed.
Next, as shown in FIG. 9, a new steel pipe installed inside the downstream side fixing base 18 is carried in from the opening 21 (downstream side opening portion 21a) by the crane 22. At this time, the inside (cavity) of the downstream fixed base 18 is curved, and the downstream end side is partially reduced in diameter. Therefore, depending on the installation location, a new cylindrical steel pipe 38 and FIG. The new foldable steel pipe 39 shown is used properly.
As shown in FIG. 10, the new iron pipe 39 has a bottom wall 40 divided into three in the circumferential direction, and left and right rotating walls 41 rotatably connected to both sides of the bottom wall 40 in the width direction. By folding each rotating wall 41 toward the bottom wall 40, the height can be lowered, so that the new cylindrical iron pipe 38 can pass through a place where the new iron pipe 38 cannot pass. Therefore, the new steel pipe 39 is conveyed to the installation position on the downstream side in a state where each rotating wall 41 is folded toward the bottom wall 40 side, and is assembled into a circular tube.
The new steel pipes 38 and 39 are both transported to the downstream fixed base 18 using the bottom 29 of the existing steel pipe 12a, and the chain block 33 for transport described above is used for transport. The new steel pipe 39 can be smoothly transported by being placed on the transport carriage 42. In the present embodiment, the connecting tool 34 for connecting the chain block 33 is attached to the center portion in the width direction on the upper surface side of the bottom wall 40, but it may be attached to the transport carriage.

次に、既設鉄管１２ａの底部２９（図９のハッチング部）を除去する。底部２９は、下流側から上流側に向かって順次軸方向に分割されて、図１１に示すように、残存する上流側の底部２９の内周面上を内周面に沿って開口部２１まで搬送されて除去される。このとき、底部２９も、前述の天井部２６及び両側面部３５ａ、３５ｂと同様に、トンネル用チェーンブロック２８で吊下げられた状態で分割される。そして、底部２９の内周（上面）側の幅方向中央部に、前述の連結具３４が取り付けられているので、搬送用のチェーンブロック３３を連結して上流側に引っ張ることにより、分割された底部２９を上流側の底部２９に載置して搬送することができる。
以上のようにして底部２９が全て除去され、既設鉄管１２ａの除去が完了する。 Next, the bottom portion 29 (hatched portion in FIG. 9) of the existing steel pipe 12a is removed. The bottom portion 29 is sequentially divided in the axial direction from the downstream side to the upstream side, and as shown in FIG. 11, the bottom portion 29 is on the inner peripheral surface of the remaining upstream side bottom portion 29 to the opening 21 along the inner peripheral surface. Transported and removed. At this time, the bottom portion 29 is also divided in a state of being suspended by the tunnel chain block 28, similarly to the ceiling portion 26 and the side surface portions 35a and 35b described above. Then, since the above-mentioned connecting tool 34 is attached to the central portion in the width direction on the inner peripheral (upper surface) side of the bottom portion 29, it is divided by connecting the chain block 33 for transportation and pulling it to the upstream side. The bottom portion 29 can be placed on the bottom portion 29 on the upstream side and transported.
As described above, the bottom portion 29 is completely removed, and the removal of the existing steel pipe 12a is completed.

次に、図１２に示すように、新規鉄管４４が、開口部２１（下流側開口部位２１ａ）が形成されていた場所から輪切り状態で搬入されて、開口部２１より下流側に順次搬送され、隣り合う他の新規鉄管４４と連結されて設置される。なお、クレーン２２で搬入される新規鉄管４４は、１つずつチェーンブロック３３で下流側に搬送されて、先に設置された他の新規鉄管４４と連結されてもよいし、トンネル１４の入口（上流端）付近で他の新規鉄管４４と連結された後、まとめて下流側に搬送されて、先に設置された他の新規鉄管４４とさらに連結されてもよい。このとき、新規鉄管４４の搬入位置で小支台２０が設置されていない場所に、水圧管路１１の長手方向に沿って支持台４５を仮設することにより、新規鉄管４４を確実に支持して案内し、搬送作業をスムーズに行うことができる。なお、小支台２０の上流端側の周縁に、小支台２０の内周面（円周方向）に沿って２～３個のスライドシューを取り付け、新規鉄管４４の底面側の外周面にスライドレールを取り付けることにより、新規鉄管４４を小支台２０の軸方向に沿ってスムーズに移動させることができる。 Next, as shown in FIG. 12, the new steel pipe 44 is carried in in a sliced state from the place where the opening 21 (downstream opening portion 21a) was formed, and is sequentially conveyed to the downstream side from the opening 21. It is installed in connection with other new steel pipes 44 adjacent to each other. The new iron pipes 44 carried in by the crane 22 may be conveyed to the downstream side one by one by the chain block 33 and connected to the other new iron pipes 44 installed earlier, or may be connected to the entrance of the tunnel 14 (the entrance of the tunnel 14 ( After being connected to another new iron pipe 44 in the vicinity of the upstream end), the crane may be collectively transported to the downstream side and further connected to the other new iron pipe 44 installed earlier. At this time, the new steel pipe 44 is reliably supported by temporarily installing the support base 45 along the longitudinal direction of the hydraulic pipe 11 in a place where the small abutment 20 is not installed at the carry-in position of the new steel pipe 44. It is possible to guide and smoothly carry out the transportation work. Two to three slide shoes are attached to the peripheral edge of the small abutment 20 on the upstream end side along the inner peripheral surface (circumferential direction) of the small abutment 20, and are attached to the outer peripheral surface on the bottom surface side of the new iron pipe 44. By attaching the slide rail, the new iron pipe 44 can be smoothly moved along the axial direction of the small abutment 20.

次に、開口部２１（上流側開口部位２１ｂ）より上流側の既設鉄管１２ｂの除去を行う。まず、天井部４６（図１３、図１４のハッチング部）を除去するが、既設鉄管１２ａの天井部２６を除去した場合とは異なり、天井部４６の分割及び搬出は、下流側から上流側に向かって順次行われる。また、既設鉄管１２ｂは、地上に露出して設置されているので、トンネル用チェーンブロック２８（図５参照）の代わりに、図１４に示すように、既設鉄管１２ｂの外周を囲うように設置される門型フレーム４７に取り付けられた地上用チェーンブロック４８で吊下げられた状態で分割され、分割後に既設鉄管１２ｂの底部４９に載置される。そして、天井部２６の場合と同様の支持部材３０、スライドシュー３１及び連結具３４を用いることにより、底部４９の内周面上を内周面に沿って開口部２１までスムーズに搬送され、上流側開口部位２１ｂから取り出される。なお、図１３に示すように、既設鉄管１２ｂの搬送用のチェーンブロック５０は、上流側固定台１６の入口（上流）側（例えば水槽１３内の適切な位置）に取り付けられ、連結具３４までの経路の途中に適宜、設置されるチェーン滑車５１により方向転換及びルート選択を行うことができる。 Next, the existing steel pipe 12b on the upstream side of the opening 21 (upstream opening portion 21b) is removed. First, the ceiling portion 46 (hatched portions in FIGS. 13 and 14) is removed, but unlike the case where the ceiling portion 26 of the existing steel pipe 12a is removed, the ceiling portion 46 is divided and carried out from the downstream side to the upstream side. It is done sequentially toward. Further, since the existing steel pipe 12b is exposed on the ground and installed, it is installed so as to surround the outer periphery of the existing steel pipe 12b as shown in FIG. 14 instead of the tunnel chain block 28 (see FIG. 5). It is divided in a state of being suspended by a ground chain block 48 attached to a gate-shaped frame 47, and after the division, it is placed on the bottom 49 of the existing steel pipe 12b. Then, by using the support member 30, the slide shoe 31, and the connecting tool 34 as in the case of the ceiling portion 26, the support member 30, the slide shoe 31, and the connecting tool 34 are smoothly conveyed on the inner peripheral surface of the bottom portion 49 to the opening 21 along the inner peripheral surface, and upstream. It is taken out from the side opening portion 21b. As shown in FIG. 13, the chain block 50 for transporting the existing steel pipe 12b is attached to the inlet (upstream) side (for example, an appropriate position in the water tank 13) of the upstream side fixing base 16 to the connecting tool 34. The direction can be changed and the route can be selected by the chain pulley 51 installed in the middle of the route.

以上のようにして既設鉄管１２ｂの天井部４６を全て除去した後、図１５、図１６に示すように、両側面部５３ａ、５３ｂ（図１５、図１６のハッチング部）を除去するが、既設鉄管１２ａの両側面部３５ａ、３５ｂを除去した場合とは異なり、両側面部５３ａ、５３ｂの分割及び搬出は、下流側から上流側に向かって順次行われる。なお、両側面部５３ａ、５３ｂを分割する際に、トンネル用チェーンブロック２８（図８参照）の代わりに、地上用チェーンブロック４８を使用し、両側面部５３ａ、５３ｂを搬送する際に、チェーンブロック５０を使用する以外は、既設鉄管１２ａの両側面部３５ａ、３５ｂを分割、搬送する場合と同様の手順で行われるので、説明を省略する。
次に、図１７に示すように、既設鉄管１２のうち、上流側固定台１６で固定されている部分（図１７の網掛部）を撤去する。この部分は、上流側固定台１６の内部で周囲のコンクリートと共に解体されてバケツ等で回収され、搬送用のチェーンブロック５０を利用して開口部２１（上流側開口部位２１ｂ）が形成されていた場所まで搬送される。
次に、既設鉄管１２ｂの底部４９（図１７のハッチング部）を除去する。底部４９は、上流側から下流側に向かって順次軸方向に分割されて、残存する下流側の底部４９の内周面上を内周面に沿って開口部２１まで搬送されて除去される。底部４９を分割する際に、図１４、図１６に示した地上用チェーンブロック４８を使用し、底部４９を搬送する際に、チェーンブロック５０を使用する以外は、既設鉄管１２ａの底部２９を分割、搬送する場合と同様の手順で行われるので、説明を省略する。 After removing all the ceiling portions 46 of the existing steel pipe 12b as described above, as shown in FIGS. 15 and 16, both side surface portions 53a and 53b (hatched portions of FIGS. 15 and 16) are removed, but the existing steel pipes are removed. Unlike the case where both side surface portions 35a and 35b of 12a are removed, the division and carry-out of both side surface portions 53a and 53b are sequentially performed from the downstream side to the upstream side. When the both side surface portions 53a and 53b are divided, the ground chain block 48 is used instead of the tunnel chain block 28 (see FIG. 8), and when the both side surface portions 53a and 53b are conveyed, the chain block 50 is used. The procedure is the same as that for dividing and transporting the side surface portions 35a and 35b of the existing steel pipe 12a except that the above is used, so the description thereof will be omitted.
Next, as shown in FIG. 17, a portion (shaded portion in FIG. 17) of the existing steel pipe 12 fixed by the upstream fixing base 16 is removed. This portion was disassembled together with the surrounding concrete inside the upstream fixing base 16 and collected by a bucket or the like, and an opening 21 (upstream opening portion 21b) was formed by using the chain block 50 for transportation. Will be transported to the place.
Next, the bottom 49 (hatched portion in FIG. 17) of the existing steel pipe 12b is removed. The bottom portion 49 is sequentially divided in the axial direction from the upstream side to the downstream side, and is conveyed on the inner peripheral surface of the remaining downstream side bottom portion 49 along the inner peripheral surface to the opening 21 and removed. The bottom 29 of the existing steel pipe 12a is split except that the ground chain block 48 shown in FIGS. 14 and 16 is used when the bottom 49 is divided and the chain block 50 is used when the bottom 49 is conveyed. , Since the procedure is the same as that for transporting, the description thereof will be omitted.

以上のようにして既設鉄管１２ｂの底部４９を全て除去した後、図１８に示すように、既設鉄管１２のうち、中間固定台１７で固定されている部分（図１８の網掛部）を撤去する。この部分は、中間固定台１７の内部で周囲のコンクリートと共に解体されてバケツ等で回収され、開口部２１（下流側開口部位２１ａ）が形成されていた場所からクレーン２２で搬出される。
次に、図１９に示すように、上流側固定台１６の出口（下流側）から、先に設置した最上流の新規鉄管４４の入口（上流端）までの間に、新規鉄管５５～６０を設置する。ここで、新規鉄管５５～５８は、開口部２１（下流側開口部位２１ａ又は上流側開口部位２１ｂ）が形成されていた場所から輪切り状態で搬入され、順次、上流側に搬送されて、隣り合う他の新規鉄管５６～５８と連結される。このとき、水圧管路１１の長手方向に沿って、小支台２０が設置されていない場所に仮設される複数の支持台４５により、新規鉄管５６～５８の搬送を案内することができ、新規鉄管５６～５８を所定の位置に配置することができる。なお、ストレート形状の新規鉄管５５の他に、側面視して台形状に形成され、上流側固定台１６の湾曲部に設置される新規鉄管５６、テーパ状に形成された新規鉄管５７、軸方向に伸縮可能に形成された新規鉄管５８を適宜、組み合わせて、所定の位置に設置する。そして、最後に、下流側開口部位２１ａが形成されていた場所に短尺の新規鉄管５９と軸方向に伸縮可能な新規鉄管６０を搬入し、前後（上流側及び下流側）の新規鉄管５７、４４との隙間を調整して、それぞれ連結することにより、更新作業が完了する。なお、ストレート形状の新規鉄管５５の軸方向長さは全てが同一である必要はなく、長さの異なるものを組み合わせてもよい。また、その他の新規鉄管５７～６０の数及び配置も適宜、選択することができる。 After removing all the bottom portion 49 of the existing steel pipe 12b as described above, as shown in FIG. 18, the portion of the existing steel pipe 12 fixed by the intermediate fixing base 17 (the shaded portion in FIG. 18) is removed. .. This portion is disassembled together with the surrounding concrete inside the intermediate fixing base 17, collected by a bucket or the like, and carried out by the crane 22 from the place where the opening 21 (downstream opening portion 21a) was formed.
Next, as shown in FIG. 19, the new steel pipes 55 to 60 are inserted between the outlet (downstream side) of the upstream fixing base 16 and the inlet (upstream end) of the new upstream steel pipe 44 installed earlier. Install. Here, the new steel pipes 55 to 58 are carried in in a round slice state from the place where the opening 21 (downstream side opening portion 21a or upstream side opening portion 21b) was formed, and are sequentially conveyed to the upstream side and adjacent to each other. It is connected to other new steel pipes 56 to 58. At this time, the transport of the new steel pipes 56 to 58 can be guided by a plurality of support bases 45 temporarily installed in a place where the small abutment 20 is not installed along the longitudinal direction of the hydraulic pipe line 11, and the new steel pipes 56 to 58 can be guided. The iron pipes 56 to 58 can be arranged at predetermined positions. In addition to the straight-shaped new steel pipe 55, a new steel pipe 56 formed in a trapezoidal shape when viewed from the side and installed in the curved portion of the upstream fixed base 16, a new steel pipe 57 formed in a tapered shape, and an axial direction. A new steel pipe 58 formed so as to be expandable and contractible is appropriately combined and installed at a predetermined position. Finally, a short new steel pipe 59 and a new steel pipe 60 that can be expanded and contracted in the axial direction are carried into the place where the downstream opening portion 21a was formed, and the front and rear (upstream and downstream) new steel pipes 57 and 44 are carried in. The update work is completed by adjusting the gap between the pipe and the pipe and connecting them. The lengths of the new straight steel pipes 55 in the axial direction do not necessarily have to be the same, and pipes having different lengths may be combined. In addition, the number and arrangement of other new steel pipes 57 to 60 can be appropriately selected.

以上、本発明の実施の形態を説明したが、本発明は何ら上記した実施の形態に記載の構成に限定されるものではなく、特許請求の範囲に記載されている事項の範囲内で考えられるその他の実施の形態や変形例も含むものである。
例えば、既設鉄管の除去及び新規鉄管の設置の手順は、上記実施の形態で説明した通りである必要はなく、一部の順序を入れ替えたり、複数の工程を同時に（並行して）行ったりしてもよい。
また、上記実施の形態では、既設鉄管及び新規鉄管の搬送に、クレーンとチェーンブロックを併用する場合について説明したが、チェーンブロックを使用せず、クレーンのみを使用することも可能である。クレーンのみを使用する場合、一側がクレーンのフックに連結されたチェーンを、要所に方向転換用のチェーン滑車が設置された経路（ルート）に沿って配置し、チェーンの他側を搬送対象となる既設鉄管又は新規鉄管に連結すれば、フックの上下動（昇降）により引き上げや送り出しを行うことができる。 Although the embodiment of the present invention has been described above, the present invention is not limited to the configuration described in the above-described embodiment, and can be considered within the scope of the matters described in the claims. Other embodiments and modifications are also included.
For example, the procedure for removing the existing steel pipe and installing the new steel pipe does not have to be as described in the above embodiment, and some of the orders may be changed or a plurality of steps may be performed simultaneously (in parallel). You may.
Further, in the above embodiment, the case where the crane and the chain block are used in combination for the transportation of the existing steel pipe and the new steel pipe has been described, but it is also possible to use only the crane without using the chain block. When using only a crane, place the chain connected to the hook of the crane on one side along the route where the chain pulley for turning is installed at the key point, and the other side of the chain is the target of transportation. If it is connected to an existing steel pipe or a new steel pipe, it can be pulled up or sent out by moving the hook up and down (up and down).

１０：水力発電所、１１：水圧管路、１２、１２ａ、１２ｂ：既設鉄管、１３：水槽、１４：トンネル、１６：上流側固定台、１７：中間固定台、１８：下流側固定台、２０：小支台、２１：開口部、２１ａ：下流側開口部位、２１ｂ：上流側開口部位、２２：クレーン、２３：ブーム、２４：フック、２６：天井部、２７：天井内面、２８：トンネル用チェーンブロック、２９：底部、３０：支持部材、３１：スライドシュー、３３：チェーンブロック、３４：連結具、３５ａ、３５ｂ：側面部、３６：スライドシュー、３８、３９：新規鉄管、４０：底部壁、４１：回動壁、４２：搬送台車、４４：新規鉄管、４５：支持台、４６：天井部、４７：門型フレーム、４８：地上用チェーンブロック、４９：底部、５０：チェーンブロック、５１：チェーン滑車、５３ａ、５３ｂ：側面部、５５～６０：新規鉄管 10: Hydroelectric power plant, 11: Hydraulic pipeline, 12, 12a, 12b: Existing iron pipe, 13: Water tank, 14: Tunnel, 16: Upstream side fixed base, 17: Intermediate fixed base, 18: Downstream side fixed base, 20 : Small abutment, 21: Opening, 21a: Downstream opening, 21b: Upstream opening, 22: Crane, 23: Boom, 24: Hook, 26: Ceiling, 27: Ceiling inner surface, 28: For tunnel Chain block, 29: bottom, 30: support member, 31: slide shoe, 33: chain block, 34: connector, 35a, 35b: side surface, 36: slide shoe, 38, 39: new iron pipe, 40: bottom wall , 41: Rotating wall, 42: Pulley, 44: New iron pipe, 45: Support, 46: Ceiling, 47: Gate frame, 48: Ground chain block, 49: Bottom, 50: Chain block, 51 : Chain pulley, 53a, 53b: Side part, 55-60: New iron pipe

Claims (11)

水力発電所の水圧管路から既設鉄管を除去して新規鉄管を設置する水圧管路更新方法であって、
前記水圧管路の長手方向の途中で、地上に露出している前記既設鉄管の一部から少なくとも該既設鉄管の上半分が除去されて開口部が形成され、該開口部より下流側及び上流側の前記既設鉄管は、該既設鉄管の円周方向及び軸方向に分割されて、前記開口部まで搬送されて除去されることを特徴とする水圧管路更新方法。 It is a method of renewing a hydraulic pipe that removes an existing steel pipe from the hydraulic pipe of a hydroelectric power plant and installs a new steel pipe.
In the middle of the longitudinal direction of the penstock, at least the upper half of the existing steel pipe is removed from a part of the existing steel pipe exposed on the ground to form an opening, and the downstream side and the upstream side from the opening. The method for renewing a hydraulic pipeline, wherein the existing steel pipe is divided in the circumferential direction and the axial direction of the existing steel pipe, and is conveyed to the opening and removed. 請求項１記載の水圧管路更新方法において、前記既設鉄管は、該既設鉄管の円周方向に分割される際に、天井部、両側面部及び底部の４つの部分に分割され、分割された前記天井部及び前記両側面部は前記底部の内周面上を該内周面に沿って搬送されることを特徴とする水圧管路更新方法。 In the hydraulic pipeline renewal method according to claim 1, when the existing steel pipe is divided in the circumferential direction of the existing steel pipe, the existing steel pipe is divided into four parts, a ceiling portion, both side surface portions, and a bottom portion, and the division is performed. A method for renewing a hydraulic pipeline, characterized in that the ceiling portion and the both side surface portions are conveyed on the inner peripheral surface of the bottom portion along the inner peripheral surface. 請求項２記載の水圧管路更新方法において、前記開口部より下流側の前記既設鉄管は、分割された前記天井部及び前記両側面部が除去された後、前記底部が下流側から上流側に向かって順次軸方向に分割されて、残存する上流側の前記底部の内周面上を該内周面に沿って前記開口部まで搬送されて除去され、前記開口部より上流側の前記既設鉄管は、分割された前記天井部及び前記両側面部が除去された後、前記底部が上流側から下流側に向かって順次軸方向に分割されて、残存する下流側の前記底部の内周面上を該内周面に沿って前記開口部まで搬送されて除去されることを特徴とする水圧管路更新方法。 In the hydraulic pipeline renewal method according to claim 2, in the existing iron pipe on the downstream side of the opening, the bottom portion is directed from the downstream side to the upstream side after the divided ceiling portion and both side surface portions are removed. The existing iron pipe on the upstream side of the opening is removed by being sequentially divided in the axial direction and conveyed on the inner peripheral surface of the bottom portion on the remaining upstream side to the opening along the inner peripheral surface. After the divided ceiling portion and both side surface portions are removed, the bottom portion is sequentially divided in the axial direction from the upstream side to the downstream side, and the remaining downstream side portion is on the inner peripheral surface of the bottom portion. A method for renewing a hydraulic pipeline, characterized in that it is transported to the opening along the inner peripheral surface and removed. 請求項１～３のいずれか１記載の水圧管路更新方法において、前記開口部は、前記水圧管路の長手方向の途中で、前記既設鉄管の外周をコンクリートで覆って該既設鉄管を固定する既設の中間固定台の下流側及び上流側にそれぞれ形成された下流側開口部位及び上流側開口部位を有し、前記開口部より下流側の前記既設鉄管は、分割されて前記下流側開口部位から取り出され、前記開口部より上流側の前記既設鉄管は、分割されて前記上流側開口部位から取り出されることを特徴とする水圧管路更新方法。 In the hydraulic pipeline renewal method according to any one of claims 1 to 3, the opening covers the outer periphery of the existing iron pipe with concrete in the middle of the longitudinal direction of the hydraulic pipeline to fix the existing iron pipe. The existing iron pipe having a downstream opening portion and an upstream opening portion formed on the downstream side and the upstream side of the existing intermediate fixing base, respectively, and the existing iron pipe on the downstream side of the opening is divided from the downstream opening portion. A method for renewing a hydraulic pipeline, which is taken out and the existing iron pipe on the upstream side of the opening is divided and taken out from the upstream opening portion. 請求項１～４のいずれか１記載の水圧管路更新方法において、前記新規鉄管は、前記既設鉄管が除去された後、前記開口部が形成されていた場所から輪切り状態で搬入され、該開口部より下流側及び上流側に順次搬送されて、隣り合う他の前記新規鉄管と連結されることを特徴とする水圧管路更新方法。 In the hydraulic pipeline renewal method according to any one of claims 1 to 4, after the existing steel pipe is removed, the new steel pipe is carried in in a round slice state from the place where the opening was formed, and the opening is opened. A method for renewing a hydraulic pipeline, which is sequentially conveyed to the downstream side and the upstream side from the section and connected to the other adjacent new steel pipes. 請求項５記載の水圧管路更新方法において、前記水圧管路の長手方向に沿って仮設される複数の支持台により、前記新規鉄管の搬送を案内することを特徴とする水圧管路更新方法。 The method for renewing a penstock according to claim 5, wherein the transport of the new steel pipe is guided by a plurality of support stands temporarily provided along the longitudinal direction of the penstock. 請求項１～４のいずれか１記載の水圧管路更新方法において、前記新規鉄管のうち、前記水圧管路の下流側で湾曲して既設の下流側固定台に固定される部分は、円周方向に３分割され、底部壁と、該底部壁の幅方向両側に回動可能に連結された左右の回動壁とを有し、該各回動壁が前記底部壁側に折り畳まれた状態で前記開口部から下流側の設置位置まで搬送されて円管状に組立てられることを特徴とする水圧管路更新方法。 In the hydraulic pipeline renewal method according to any one of claims 1 to 4, the portion of the new iron pipe that is curved on the downstream side of the hydraulic pipeline and fixed to the existing downstream side fixing base is circumferential. It has a bottom wall divided into three in the direction and left and right rotating walls rotatably connected to both sides of the bottom wall in the width direction, and each rotating wall is folded toward the bottom wall side. A method for renewing a hydraulic pipeline, which is conveyed from the opening to an installation position on the downstream side and assembled into a circular tube. 請求項１～７のいずれか１記載の水圧管路更新方法において、前記既設鉄管及び前記新規鉄管の搬送、前記既設鉄管の搬出及び前記新規鉄管の搬入には、共通する１台のクレーンが使用されることを特徴とする水圧管路更新方法。 In the hydraulic pipeline renewal method according to any one of claims 1 to 7, one common crane is used for transporting the existing steel pipe and the new steel pipe, carrying out the existing steel pipe, and carrying in the new steel pipe. A method for renewing a hydraulic pipeline, characterized in that it is performed. 請求項８記載の水圧管路更新方法において、前記既設鉄管及び前記新規鉄管の搬送に、前記クレーンとチェーンブロックが併用されることを特徴とする水圧管路更新方法。 The hydraulic pipeline renewal method according to claim 8, wherein the crane and the chain block are used in combination for transporting the existing steel pipe and the new steel pipe. 請求項１～９のいずれか１記載の水圧管路更新方法において、前記既設鉄管のうち、トンネル内に設置されている部分は、該トンネルの天井内面に取り付けられるトンネル用チェーンブロックで吊下げられて分割が行われることを特徴とする水圧管路更新方法。 In the hydraulic pipeline renewal method according to any one of claims 1 to 9, a portion of the existing steel pipe installed in the tunnel is suspended by a tunnel chain block attached to the inner surface of the ceiling of the tunnel. A method for renewing a hydraulic pipeline, which is characterized in that division is performed. 請求項１～１０のいずれか１記載の水圧管路更新方法において、前記既設鉄管のうち、地上に露出して設置されている部分は、該既設鉄管の外周を囲うように設置される門型フレームに取り付けられた地上用チェーンブロックで吊下げられて分割が行われることを特徴とする水圧管路更新方法。 In the hydraulic pipeline renewal method according to any one of claims 1 to 10, the portion of the existing steel pipe exposed to the ground and installed is a gate type installed so as to surround the outer periphery of the existing steel pipe. A hydraulic pipeline renewal method characterized in that it is suspended by a ground chain block attached to a frame and divided.
JP2020206911A 2020-12-14 2020-12-14 Hydraulic pipeline renewal method Pending JP2022094094A (en)

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