JP2007217878A - Construction method for pressurized manhole - Google Patents

Construction method for pressurized manhole Download PDF

Info

Publication number
JP2007217878A
JP2007217878A JP2006036452A JP2006036452A JP2007217878A JP 2007217878 A JP2007217878 A JP 2007217878A JP 2006036452 A JP2006036452 A JP 2006036452A JP 2006036452 A JP2006036452 A JP 2006036452A JP 2007217878 A JP2007217878 A JP 2007217878A
Authority
JP
Japan
Prior art keywords
manhole
side wall
pressurized
partition
ground
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2006036452A
Other languages
Japanese (ja)
Inventor
Norio Otsuga
則男 大津賀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SANRITSU GIKEN KK
Original Assignee
SANRITSU GIKEN KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SANRITSU GIKEN KK filed Critical SANRITSU GIKEN KK
Priority to JP2006036452A priority Critical patent/JP2007217878A/en
Publication of JP2007217878A publication Critical patent/JP2007217878A/en
Pending legal-status Critical Current

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for a pressurized manhole, which can prevent ground water and sediment from flowing into the manhole due to ground-water pressure, during the execution of work associated with penetration through a side wall of a manhole buried into ground. <P>SOLUTION: In this construction method for the pressurized manhole, the inside of a manhole connected body 1 on the downside of an airtight bulkhead 4 is put into a pressurized state, and earthquake-resisting work for changing a rigid joint into an aseismatic joint by excavating the side wall 10 of a rigidly jointed section is performed from the inside of the manhole 11. This can prevent the ground water and the sediment from flowing into the manhole during the earthquake-resisting work. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、地中に埋設されたマンホールの側壁の貫通を伴う様々な工事を行う際に好適な加圧式マンホール施工方法に関わり、特に耐震化工事に好適な加圧式マンホール施工方法に係わる。   The present invention relates to a pressure-type manhole construction method suitable for performing various constructions involving the penetration of side walls of manholes buried in the ground, and more particularly to a pressure-type manhole construction method suitable for earthquake-resistant construction.

マンホールは、下水道管が側壁に接合され地中に埋設されている(特許文献1参照)。
特開2003−90077号公報
The manhole is embedded in the ground with a sewer pipe joined to the side wall (see Patent Document 1).
JP 2003-90077 A

例えば、側壁に下水道管を剛接合したマンホールを耐震化する場合には、剛接合部分のマンホール側壁を貫通して耐震接合に変更する必要がある。
この様な、貫通工事を行う場合には、下記に示す理由により、注入穴を側壁に複数個、開け、この注入穴から地盤補強剤をマンホール外側地盤に注入して地盤を固めていた(地盤補強剤注入による貫通工事)。
注入する理由:地下水圧により、開けた貫通穴から地下水や土砂がマンホール内に流入し、道路の陥没を招くのを防ぐため。
For example, when a manhole having a sewer pipe rigidly joined to the side wall is made earthquake resistant, it is necessary to change to a seismic joint through the manhole side wall of the rigid joint portion.
When performing such penetration work, for the reasons shown below, a plurality of injection holes were made in the side wall, and ground reinforcement was injected into the ground outside the manhole from these injection holes to solidify the ground (ground Penetration work with reinforcing agent injection).
Reason for injection: To prevent groundwater and earth and sand from flowing into the manhole from the open through hole due to groundwater pressure and causing the road to collapse.

しかし、上記の地盤補強剤注入による貫通工事は、下記に示す課題がある。
・地盤補強材、注入用の機材、注入する作業費が必要であり、大きなコストがかかる。
・マンホール側壁に、注入穴を複数個、開ける必要があるとともに、マンホールの強度低下を招く。
・マンホール外側地盤への地盤補強剤の注入により、地下水や地盤が汚染される。
・マンホール外側地盤の状態を調べ、地盤状態に応じて地盤補強剤の種類や注入量を調整する必要がある。なお、地盤補強が充分でないと、開けた貫通穴から地下水や土砂がマンホール内に流入してしまう。
However, the above-described penetration work by injecting the ground reinforcing agent has the following problems.
・ Ground reinforcement, injection equipment, and operation costs for injection are necessary, which is very expensive.
-It is necessary to open a plurality of injection holes on the side wall of the manhole, and the strength of the manhole is reduced.
・ Injecting ground reinforcement into the ground outside the manhole will contaminate groundwater and ground.
-It is necessary to check the condition of the ground outside the manhole and adjust the type and amount of the ground reinforcement depending on the ground condition. In addition, if ground reinforcement is not enough, groundwater and earth and sand will flow into the manhole from the opened through hole.

本発明の目的は、地中に埋設されたマンホールの側壁の貫通を伴う作業を行う際に、地下水圧に起因する、地下水や土砂のマンホール内への流入を防止できる加圧式マンホール施工方法の提供にある。   An object of the present invention is to provide a pressurized manhole construction method capable of preventing the inflow of groundwater or earth and sand into a manhole caused by groundwater pressure when performing work involving the penetration of the side wall of a manhole buried in the ground. It is in.

(請求項1について)
加圧式マンホール施工方法は、以下の手順で行う。
地中に埋設されるマンホールの側壁には下水道管が連結されているので、側壁の貫通を伴う様々な作業が終了する迄、空気が漏れない様に下水道管を塞ぐ。
(About claim 1)
The pressurized manhole construction method is performed according to the following procedure.
Since the sewer pipe is connected to the side wall of the manhole buried in the ground, the sewer pipe is closed so that air does not leak until various operations involving the penetration of the side wall are completed.

マンホール内に筒状シートを配するとともに、マンホールの内側上部に気密隔壁を取り付ける。
筒状シートがマンホール側壁の継目を覆う。なお、マンホール側壁の各継目に各々分離して筒状シートを配しても良く、各継目を覆う長い筒状シートを気密隔壁の下側に吊り下げても良い。また、気密隔壁は、蛇腹等の伸縮タイプでも良い。
A cylindrical sheet is arranged in the manhole, and an airtight partition is attached to the inner upper part of the manhole.
A tubular sheet covers the seam on the side wall of the manhole. A cylindrical sheet may be provided separately at each joint of the manhole side wall, or a long cylindrical sheet covering each seam may be suspended below the hermetic partition. Further, the airtight partition may be an expansion / contraction type such as a bellows.

隔壁下側のマンホール内を加圧状態にする。加圧は、例えば、空気ボンベを隔壁下側のマンホールに設置して空気を吹き出すか、気密隔壁を貫通するホースを介して空気をマンホール内へ送り込んで行う。
なお、側壁を貫通する位置のマンホール内の気圧が、マンホール外側の地中水圧と釣り合うか、それより高い気圧になる様にマンホール内を加圧する。
The inside of the manhole below the partition is in a pressurized state. The pressurization is performed, for example, by installing an air cylinder in the manhole below the partition wall and blowing out air, or sending air into the manhole through a hose penetrating the hermetic partition wall.
In addition, the inside of the manhole is pressurized so that the atmospheric pressure in the manhole at a position penetrating the side wall is balanced with the underground water pressure outside the manhole or higher.

隔壁下側のマンホール内を加圧すると筒状シートが膨らみ、マンホールの内壁に押し付けられ、マンホール側壁の継目を塞ぐ。これにより、マンホールの継目からの空気漏れを防止でき、マンホール内を加圧状態に維持できる。   When the inside of the manhole below the partition wall is pressurized, the cylindrical sheet swells and is pressed against the inner wall of the manhole to close the joint of the manhole side wall. Thereby, the air leak from the joint of a manhole can be prevented, and the inside of a manhole can be maintained in a pressurized state.

隔壁下側のマンホール内の気圧を、マンホール外側の地中水圧と等しいか、それより高い気圧にすることにより、側壁の貫通を伴う様々な作業を、隔壁下側のマンホール内から行う(作業人またはロボット)際に、地下水圧に起因する、地下水や土砂のマンホール内への流入を防止できる。   By making the air pressure in the manhole below the partition wall equal to or higher than the underground water pressure outside the manhole, various operations involving the penetration of the side wall are performed from inside the manhole below the partition wall (workers (Or robot), it is possible to prevent the inflow of groundwater or earth and sand into the manhole due to groundwater pressure.

(請求項2について)
加圧式マンホール施工方法は、以下の手順で行う。
鉛直に地中へ埋設されるマンホールの下方側壁には下水道管が連結されているので、側壁の貫通を伴う様々な作業が終了する迄、下水道管から空気が漏れない様に下水道管の管路を栓で塞いで閉塞する。なお、貫通工事が終了して栓を外せば、管路を容易に開放できる。
(About claim 2)
The pressurized manhole construction method is performed according to the following procedure.
Since the sewer pipe is connected to the lower side wall of the manhole that is buried in the ground vertically, the pipe line of the sewer pipe so that air does not leak from the sewer pipe until various operations involving the penetration of the side wall are completed. Is closed with a stopper. The pipe line can be easily opened by removing the plug after the penetration work is completed.

マンホール内に筒状シートを配するとともに、マンホールの内側上部に気密隔壁を略水平に取り付ける。
筒状シートがマンホール側壁の継目を覆う。なお、マンホール側壁の各継目に各々分離して筒状シートを配しても良く、各継目を覆う長い筒状シートを気密隔壁の下側に吊り下げても良い。また、気密隔壁は、蛇腹等の伸縮タイプでも良い。
加圧中に外れない様に、マンホール(通常は、断面が円形)の内側上部に気密隔壁を略水平に取り付ける。
A cylindrical sheet is arranged in the manhole, and an airtight partition is attached to the upper part inside the manhole substantially horizontally.
A tubular sheet covers the seam on the side wall of the manhole. A cylindrical sheet may be provided separately at each joint of the manhole side wall, or a long cylindrical sheet covering each seam may be suspended below the hermetic partition. Further, the airtight partition may be an expansion / contraction type such as a bellows.
An airtight partition wall is mounted substantially horizontally on the inner top of a manhole (usually circular in cross section) so that it does not come off during pressurization.

気密隔壁を貫通するホースを介して圧搾空気を送り込み、隔壁下側のマンホール内を加圧する。ホースを介して圧搾空気を隔壁下側のマンホール内へ送り込んでいるので、長時間、マンホール内を加圧状態に維持できる。
なお、側壁を貫通する位置のマンホール内の気圧が、マンホール外側の地中水圧と釣り合うか、それより高い気圧になる様にマンホール内を加圧する。
Compressed air is sent through a hose penetrating the hermetic partition, and the inside of the manhole below the partition is pressurized. Since the compressed air is sent into the manhole below the partition wall through the hose, the inside of the manhole can be maintained in a pressurized state for a long time.
In addition, the inside of the manhole is pressurized so that the atmospheric pressure in the manhole at the position penetrating the side wall is balanced with the underground water pressure outside the manhole or higher.

隔壁下側のマンホール内を加圧すると円筒状シートが円筒状に膨らみ、マンホールの内壁に押し付けられ、マンホール側壁の継目を塞ぐ。これにより、マンホールの継目からの空気漏れを防止でき、少ない送気量の圧搾空気でマンホール内の加圧状態を長時間、維持できる。   When the inside of the manhole below the partition wall is pressurized, the cylindrical sheet swells in a cylindrical shape and is pressed against the inner wall of the manhole to close the seam of the manhole side wall. Thereby, the air leak from the joint of a manhole can be prevented, and the pressurization state in a manhole can be maintained for a long time with the compressed air with little air supply amount.

隔壁下側のマンホール内の気圧を、マンホール外側の地中水圧と等しいか、それより高い気圧にすることにより、地中に埋設されたマンホールの側壁の貫通を伴う様々な作業を、隔壁下側のマンホール内から行う(作業人またはロボット)際に、地下水圧に起因する、地下水や土砂のマンホール内への流入を防止できる。   By making the air pressure in the manhole below the partition wall equal to or higher than the underground water pressure outside the manhole, various operations involving the penetration of the side wall of the manhole embedded in the ground When the work is performed from within the manhole (worker or robot), it is possible to prevent inflow of groundwater or earth and sand into the manhole due to groundwater pressure.

(請求項3について)
加圧式マンホール施工方法は、以下の手順で行う。
鉛直に地中へ埋設されるマンホールの下方側壁には下水道管が連結されているので、側壁の貫通を伴う様々な作業が終了する迄、下水道管から空気が漏れない様に下水道管の管路を栓で塞いで閉塞する。なお、貫通工事が終了して栓を外せば、管路を容易に開放できる。
(Claim 3)
The pressurized manhole construction method is performed according to the following procedure.
Since the sewer pipe is connected to the lower side wall of the manhole that is buried in the ground vertically, the pipe line of the sewer pipe so that air does not leak from the sewer pipe until various operations involving the penetration of the side wall are completed. Is closed with a stopper. The pipe line can be easily opened by removing the plug after the penetration work is completed.

下側に円筒状シートを吊り下げた気密隔壁を、加圧中に外れない様に、マンホール(通常は、断面が円形)の内側上部に略水平に取り付ける。
気密隔壁を貫通するホースを介して、隔壁下側のマンホール内へ圧搾空気を送り込み、マンホール内がマンホール外側の地中水圧と釣り合う気圧になる様に、マンホール内を徐々に加圧する。
An airtight partition with a cylindrical sheet suspended below is attached approximately horizontally to the upper part of the manhole (usually circular in cross section) so that it does not come off during pressurization.
The compressed air is sent into the manhole below the partition through a hose that penetrates the hermetic partition, and the inside of the manhole is gradually pressurized so that the inside of the manhole becomes an air pressure that balances the underground water pressure outside the manhole.

隔壁下側のマンホール内を加圧していくと円筒状シートが皺無く円筒状に膨らんでいき、マンホールの内壁にピッタリ押し付けられる。これにより、マンホールの側壁や上下のマンホールどうしの継目からの空気漏れを確実に防止でき、少ない送気量の圧搾空気でマンホール内の加圧状態を長時間、維持できる。   When the inside of the manhole below the partition wall is pressurized, the cylindrical sheet swells into a cylindrical shape without any wrinkles and is pressed perfectly against the inner wall of the manhole. Thereby, the air leak from the side wall of a manhole or the joint of the upper and lower manhole can be prevented reliably, and the pressurization state in a manhole can be maintained for a long time with the compressed air with a small amount of air supply.

マンホール側壁の貫通を伴う様々な作業を、隔壁下側の加圧状態のマンホール内から行って(作業人またはロボット)完了させる。
作業が完了し、貫通穴を塞いだら、ホースを介して排気してマンホール内の気圧を徐々に外気圧に戻す。
気密隔壁をマンホール外へ撤去して全ての作業を終了する。
Various operations involving the penetration of the manhole side wall are completed (worker or robot) from the pressurized manhole under the partition wall.
When the work is completed and the through hole is closed, the air pressure in the manhole is gradually returned to the external pressure by exhausting through the hose.
Remove the airtight bulkhead outside the manhole and finish all work.

加圧式マンホール施工方法は、隔壁下側のマンホール内の気圧を、マンホール外側の地中水圧と等しい気圧にすることにより、マンホール側壁の貫通を伴う様々な作業を、隔壁下側のマンホール内から行う(作業人またはロボット)際に、地下水圧に起因する、地下水や土砂のマンホール内への流入を防止できる。なお、マンホール内がマンホール外側の地中水圧と釣り合う気圧であるので、マンホール外側の土壌が抉られることがない。   The pressurized manhole construction method performs various operations involving the penetration of the manhole side wall from the manhole below the partition wall by setting the pressure in the manhole below the partition wall to the same atmospheric pressure as the underground water pressure outside the manhole. (Workers or robots) can prevent inflow of groundwater or earth and sand into the manhole due to groundwater pressure. In addition, since the pressure inside the manhole is balanced with the underground water pressure outside the manhole, the soil outside the manhole is not drowned.

気密隔壁の下側に円筒状シートを吊り下げ、マンホール内を加圧する構成であるので、マンホール側壁や上下のマンホールどうしの継目からの空気漏れを確実に防止でき、少ない送気量の圧搾空気でマンホール内の加圧状態を長時間、維持できる。また、吊り下げ式であるので、円筒状シートの設置と撤去を円滑に行える。   Since the cylindrical sheet is suspended under the airtight partition and pressurizes the inside of the manhole, air leakage from the manhole side walls and the seams between the upper and lower manholes can be reliably prevented, and compressed air with a small air supply volume can be used. The pressurized state in the manhole can be maintained for a long time. Moreover, since it is a suspension type, installation and removal of a cylindrical sheet | seat can be performed smoothly.

マンホール側壁に下水道管を剛接合した部分を耐震接合に変更する耐震化工事を含むマンホール施工工事は、下記に示す手順で行われる。
(1)鉛直に地中へ埋設されるマンホールの下方側壁に連結した下水道管の管路を栓で塞ぐ。
(2)下側に円筒状シートを吊り下げた気密隔壁を、隔壁浮上防止用の支柱で支えてマンホールの内側上部に水平に取り付ける。
Manhole construction work including seismic retrofitting work that changes the sewer pipe rigidly joined to the side wall of the manhole to seismic joint is performed according to the following procedure.
(1) The pipe of the sewer pipe connected to the lower side wall of the manhole vertically buried in the ground is closed with a stopper.
(2) A hermetic partition with a cylindrical sheet suspended below is supported horizontally by a support for preventing the partition from rising, and is mounted horizontally on the upper part of the manhole.

(3)気密隔壁を貫通するエアホースを介して、隔壁下側のマンホール内へ、エアホースに繋いだコンプレッサにより圧搾空気を送り込み、貫通工事を行う位置の地中水圧(例えば5mで0.05MPa)と釣り合う気圧(この例では0.05MPa)になる様に、マンホール内を徐々に加圧する。 (3) Through the air hose penetrating the airtight partition wall, the compressed air is sent by the compressor connected to the air hose into the manhole below the partition wall, and the underground water pressure (for example, 0.05 MPa at 5 m) at the position where the penetration work is performed. The inside of the manhole is gradually pressurized so that the pressure is balanced (in this example, 0.05 MPa).

(4)下水道管を剛接合した部分のマンホール側壁を貫通して耐震接合に変更する耐震化工事を加圧状態(この例では0.05MPa)で隔壁下側のマンホール内から、作業人またはロボットで行う。
(5)耐震化工事が完了し、耐震接合部分の気密が充分に確保できたら、ホースを介して排気し、マンホール内の気圧を徐々に外気圧に戻す。
(6)気密隔壁をマンホール外へ撤去してマンホール施工工事を終了する。
(4) A seismic construction that changes to seismic joint through the manhole side wall where the sewer pipe is rigidly joined is pressed (0.05MPa in this example) from inside the manhole under the partition wall from the worker or robot To do.
(5) When the earthquake-proofing work is completed and the airtightness of the seismic joint is sufficiently secured, exhaust through the hose and gradually return the pressure in the manhole to the external pressure.
(6) Remove the airtight partition outside the manhole and complete the manhole construction work.

この加圧式マンホール施工方法で、地中に埋設されたマンホールの側壁を貫通して耐震接合に変更する耐震化工事を含むマンホール施工工事を行えば、地下水圧に起因する、地下水や土砂がマンホール内へ流入することがない。   With this pressure-type manhole construction method, if manhole construction work including seismic retrofitting that changes to seismic joints through the side walls of manholes buried in the ground, groundwater and earth and sand caused by groundwater pressure will flow into the manhole. Never flow into.

本発明の実施例1(請求項1〜3に対応)を図1〜図4に基づいて説明する。
マンホールと下水道管との連結構造Aは、図4に示す如く、最下段のマンホール11の側壁10に下水道管2、3の端部21、31を耐震接合している。なお、マンホール11の内径は、90cm〜1.5mである。
A first embodiment (corresponding to claims 1 to 3) of the present invention will be described with reference to FIGS.
As shown in FIG. 4, the connecting structure A between the manhole and the sewer pipe has the end portions 21, 31 of the sewer pipes 2, 3 seismically joined to the side wall 10 of the lowermost manhole 11. The inner diameter of the manhole 11 is 90 cm to 1.5 m.

なお、図4に示すマンホールと下水道管との連結構造Aは、最下段のマンホール11に下水道管2、3の端部21、31を剛接合した既設のマンホールと下水道管との連結構造Bに耐震化工事を含むマンホール施工工事を行ったものである。   In addition, the connection structure A of a manhole and a sewer pipe shown in FIG. 4 is the connection structure B of the existing manhole and the sewer pipe which rigidly joined the end parts 21 and 31 of the sewer pipes 2 and 3 to the lowermost manhole 11. Manhole construction work including earthquake resistance work was performed.

マンホール連結体1は、マンホール11を含むマンホール12〜15を、連結部材とシール部材とを用い、上下方向に積み重ねて地中に埋設したものである。なお、現場で型枠を組んでマンホールを一体形成して地中に埋設する現場打ちタイプにも、下記のマンホール施工工事を適用できる。   In the manhole connector 1, manholes 12 to 15 including the manhole 11 are stacked in the vertical direction using a connecting member and a seal member and buried in the ground. In addition, the following manhole construction work can also be applied to an in-situ type where a formwork is assembled on site and a manhole is integrally formed and buried in the ground.

既設のマンホールと下水道管との連結構造Bに対するマンホール施工工事は、下記に示す手順で行う。
(1)鉛直に地中へ埋設されるマンホール連結体1のマンホール11に下水道管2、3の端部21、31を剛接合した既設のマンホールと下水道管との連結構造Bにおいて、管路から空気が漏れない様に、下水道管2、3の管路を栓22、32で塞ぐ(図1参照)。なお、耐震化工事が終了して栓22、32を外せば、管路を容易に開放できる。
Manhole construction work for the existing manhole and sewer pipe connection structure B is performed according to the following procedure.
(1) In an existing manhole and sewer pipe connection structure B in which the end portions 21 and 31 of the sewer pipes 2 and 3 are rigidly joined to the manhole 11 of the manhole connector 1 vertically embedded in the ground, from the pipe line The pipes of the sewer pipes 2 and 3 are closed with plugs 22 and 32 so that air does not leak (see FIG. 1). In addition, if the seismic construction is completed and the plugs 22 and 32 are removed, the pipe line can be easily opened.

(2)下面側にゴム製(ビニル製も可)の円筒状シート41を吊り下げた気密隔壁4を、蓋16と隔壁浮上防止用の支柱42、42で支えてマンホール連結体1の内側上部に、加圧中に外れない様に、ボルト式の固定具43で水平に取り付ける{図2の(a)参照}。なお、上記蓋16および気密隔壁4には、エアホース61を通すための貫通孔17、40が開けられている。
但し、気密隔壁4を取り付ける前に、先端に超硬チップ51を取り付けたリング状のコアビット52が高速回転して側壁10の掘削除去が可能な掘削装置5をマンホール底に固定しておく。
(2) The inner upper part of the manhole connector 1 is supported by the airtight partition wall 4 in which a cylindrical sheet 41 made of rubber (which may be vinyl) is suspended on the lower surface side, supported by a lid 16 and support columns 42 and 42 for preventing the partition wall from rising. In addition, it is mounted horizontally with a bolt-type fixture 43 so that it does not come off during pressurization {see (a) of FIG. 2}. The lid 16 and the airtight partition 4 are provided with through holes 17 and 40 for allowing the air hose 61 to pass therethrough.
However, before attaching the hermetic partition wall 4, the ring-shaped core bit 52 with the carbide tip 51 attached to the tip rotates at a high speed and the excavator 5 capable of excavating and removing the side wall 10 is fixed to the manhole bottom.

(3)エアホース61に繋いだエアコンプレッサ6を作動状態にし、隔壁下側のマンホール連結体1内へ圧搾空気を送り込み、貫通工事を行う位置の地中水圧(例えば5mで0.05MPa)と釣り合う気圧(この例では0.05MPa)になる様に、隔壁下側のマンホール連結体1内を徐々に加圧する。なお、蓋16が浮上しない様に、予め、下向に荷重gをかけておく。
隔壁下側のマンホール連結体1内を徐々に加圧していくとゴム製の円筒状シート41が皺にならずに円筒状に膨らんでいき、マンホール連結体1の内壁にピッタリ押し付けられる{図2の(b)参照}。
(3) The air compressor 6 connected to the air hose 61 is put into an operating state, compressed air is sent into the manhole connector 1 below the partition wall, and the ground water pressure (for example, 0.05 MPa at 5 m) at the position where the penetration work is performed is balanced. The inside of the manhole connector 1 below the partition wall is gradually pressurized so as to be at atmospheric pressure (0.05 MPa in this example). Note that a load g is applied in advance downward so that the lid 16 does not float.
When the inside of the manhole coupling body 1 under the partition wall is gradually pressurized, the rubber cylindrical sheet 41 swells into a cylindrical shape without becoming wrinkles, and is exactly pressed against the inner wall of the manhole coupling body {FIG. (B)}.

(4)掘削装置5を遠隔操作で作動状態にしてコアビット52を高速回転させ、下水道管2、3の端部21、31が剛接合している部分の側壁10を、マンホール連結体1内から掘削除去し、トーラス状の隙間を形成する(図3参照)。
(5)フレキシブルジョイント7、8を用い、耐震接合に変更する。
(4) The excavator 5 is remotely operated to rotate the core bit 52 at high speed, and the side wall 10 of the portion where the end portions 21 and 31 of the sewer pipes 2 and 3 are rigidly joined is connected from the manhole connection body 1. Excavation is removed to form a torus-shaped gap (see FIG. 3).
(5) Use flexible joints 7 and 8 and change to seismic joint.

(6)上記(4)、(5)の耐震化工事が完了すると、エアホース61を介して排気してマンホール連結体1内の気圧を徐々に外気圧に戻す。
(7)気密隔壁4および掘削装置5をマンホール連結体1外へ撤去してマンホール施工工事が終了する(図4参照)。
(6) When the seismic construction of (4) and (5) is completed, the air is exhausted through the air hose 61 and the pressure inside the manhole connector 1 is gradually returned to the external pressure.
(7) The airtight partition wall 4 and the excavator 5 are removed from the manhole connector 1 to complete the manhole construction work (see FIG. 4).

実施例1は、下記の利点を有する。
加圧式マンホール施工方法は、隔壁下側のマンホール連結体1内の気圧を、剛接合部分のマンホール外側の地中水圧と釣り合う気圧に維持して、剛接合部分の側壁10を掘削除去(貫通する)して耐震接合に変更する耐震化工事を気密隔壁4の下側のマンホール連結体1内から行う構成である。
マンホール連結体1内が適度に加圧されているので、地下水や土砂がマンホール連結体1内へ流入することなく、下水道管2、3を剛接合した部分の側壁10を掘削除去して耐震接合に変更する耐震化工事をマンホール内から行うことができる。
Example 1 has the following advantages.
The pressure type manhole construction method maintains the pressure in the manhole connector 1 below the partition wall at a pressure balanced with the underground water pressure outside the manhole in the rigid joint portion, and excavates and removes (penetrates through) the side wall 10 of the rigid joint portion. ) And the seismic retrofitting work to change to the seismic joint is performed from the inside of the manhole connection body 1 below the hermetic partition 4.
Since the inside of the manhole connector 1 is moderately pressurized, the side wall 10 at the portion where the sewer pipes 2 and 3 are rigidly joined is excavated and removed without causing groundwater or earth and sand to flow into the manhole connector 1, and the earthquake resistant joint is obtained. The earthquake-proof construction to be changed to can be done from within the manhole.

なお、エアホース61に繋いだエアコンプレッサ6を作動状態にし、隔壁下側のマンホール連結体1内へ圧搾空気を送り込み、耐震接合に変更する深さの地中水圧と釣り合う気圧になる様に、隔壁下側のマンホール連結体1内を加圧し、ゴム製の円筒状シート41をマンホール連結体1の内壁にピッタリ押し付けているので、側壁10やマンホール11〜13の継ぎ目からの空気漏れを確実に防止でき、少ない送気量の圧搾空気で、隔壁下側のマンホール連結体1内の加圧状態を長時間、維持できる。   In addition, the air compressor 6 connected to the air hose 61 is in an operating state, the compressed air is sent into the manhole connector 1 below the partition wall, and the partition wall is made to have an air pressure that balances the underground water pressure with the depth changed to the seismic joint. The inside of the lower manhole connector 1 is pressurized and the rubber cylindrical sheet 41 is pressed perfectly against the inner wall of the manhole connector 1, so that air leakage from the side wall 10 and the joints of the manholes 11 to 13 is surely prevented. The compressed state in the manhole connector 1 on the lower side of the partition wall can be maintained for a long time with compressed air with a small air supply amount.

加圧式マンホール施工方法は、地盤補強材、地盤補強材を注入するための機材、および地盤補強材を注入する作業費が不要でありコストが低減できる。
また、マンホール側壁に、地盤補強材を注入するため注入穴を開ける必要がないのでマンホールの強度低下を招かない。
更に、マンホール外側地盤へ地盤補強剤を注入しないので、地下水や地盤が汚染されない。また、マンホール外側地盤の状態を調べる必要がない。
The pressurizing manhole construction method does not require the ground reinforcing material, the equipment for injecting the ground reinforcing material, and the operation cost for injecting the ground reinforcing material, and can reduce the cost.
Further, since it is not necessary to make an injection hole in order to inject the ground reinforcing material into the side wall of the manhole, the strength of the manhole is not reduced.
Furthermore, since ground reinforcement is not injected into the ground outside the manhole, groundwater and ground are not contaminated. Moreover, it is not necessary to check the condition of the ground outside the manhole.

本発明は、上記実施例以外に、つぎの実施態様を含む。
a.剛接合部分の側壁10を掘削除去するのは、人力でも、遠隔操作できる掘削装置でも良い。なお、人力で掘削除去する場合には、潜水病を防ぐため、加圧と減圧を徐々に行うか、気密服を着用して行う。
The present invention includes the following embodiments in addition to the above embodiments.
a. The side wall 10 of the rigid joint portion may be excavated and removed by human power or a remotely operated excavator. In addition, when excavating and removing by human power, in order to prevent diving diseases, pressurization and decompression are gradually performed, or airtight clothing is worn.

b.耐震接合に変更する際、下水道管の太さに応じてフレキシブルジョイントの種類を替えるのが好ましい。
c.エアホースで圧搾空気を隔壁下側のマンホール連結体1内へ送り込む替わりに、隔壁下側のマンホール連結体1内に設置した空気ボンベから空気を放出して加圧しても良い。
b. When changing to seismic joint, it is preferable to change the type of flexible joint according to the thickness of the sewer pipe.
c. Instead of sending compressed air into the manhole connector 1 on the lower side of the partition wall with an air hose, air may be released from the air cylinder installed in the manhole connector 1 on the lower side of the partition wall and pressurized.

d.気密隔壁4の下側に円筒状シート41を吊さず、変形例の図5に示す様に、マンホール11、12、13のマンホール内壁の継目に円筒状シート44、45を貼着して、隔壁下側のマンホール連結体1内を加圧する構成であっても良い(請求項1、2に対応)。なお、この場合には、気密隔壁46の隙間に気密スペーサー47をネジ48で固定して気密を図る必要がある。 d. The cylindrical sheet 41 is not hung on the lower side of the airtight partition wall 4, and as shown in FIG. 5 of the modified example, the cylindrical sheets 44 and 45 are attached to the joints of the manhole inner walls of the manholes 11, 12, and 13, The inside of the manhole coupling body 1 below the partition wall may be pressurized (corresponding to claims 1 and 2). In this case, it is necessary to fix the airtight spacer 47 with a screw 48 in the gap of the airtight partition wall 46 to achieve airtightness.

マンホールに下水道管の端部を剛接合した既設のマンホールと下水道管との連結構造において、下水道管に栓をした状態を示す説明図である。It is explanatory drawing which shows the state which plugged the sewer pipe in the connection structure of the existing manhole and the sewer pipe which joined the end part of the sewer pipe to the manhole. (a)は下面側に円筒状シートを吊り下げた気密隔壁を、マンホール連結体の内側上部に取り付けた状態を示す説明図であり、(b)はエアホースに繋いだエアコンプレッサを作動状態にし、隔壁下側のマンホール連結体内へ圧搾空気を送り込むと円筒状シートが膨らんでマンホール連結体の内壁に押し付けられた状態を示す説明図である。(A) is explanatory drawing which shows the state which attached the airtight partition which suspended the cylindrical sheet | seat on the lower surface side to the inner upper part of a manhole coupling body, (b) made the air compressor connected to the air hose into an operation state, It is explanatory drawing which shows the state by which the cylindrical sheet swelled and pressed against the inner wall of the manhole coupling body when compressed air was sent into the manhole coupling body below the partition walls. 掘削装置を遠隔操作で作動状態にしてコアビットを高速回転させ、下水道管の端部が剛接合している部分の側壁を、マンホール連結体内から掘削除去する様子を示す説明図である。It is explanatory drawing which shows a mode that the excavator is operated by remote control, a core bit is rotated at high speed, and the side wall of the part where the end part of the sewer pipe is rigidly connected is excavated and removed from the manhole connection body. 最下段のマンホールの側壁に下水道管の端部を耐震接合したマンホールと下水道管との連結構造の説明図である。It is explanatory drawing of the connection structure of the manhole and the sewer pipe which carried out the seismic joining of the edge part of the sewer pipe to the side wall of the lowermost manhole. 変形例において、掘削装置を遠隔操作で作動状態にしてコアビットを高速回転させ、下水道管の端部が剛接合している部分の側壁を、マンホール連結体内から掘削除去する様子を示す説明図である。In a modification, it is explanatory drawing which shows a mode that excavating and removing the side wall of the part to which the end part of a sewer pipe is rigidly joined by operating a drilling apparatus by remote operation in high speed, and the end part of a sewer pipe is rigidly joined. .

符号の説明Explanation of symbols

A マンホールと下水道管との連結構造
B 既設のマンホールと下水道管との連結構造
1 マンホール連結体(マンホール)
2、3 下水道管
4 気密隔壁
10 側壁
11 マンホール
22、32 栓
41 円筒状シート(筒状シート)
60 圧搾空気
61 エアホース(ホース)
A Connection structure between manhole and sewer pipe B Connection structure between existing manhole and sewer pipe 1 Manhole connection body (manhole)
2, 3 Sewer pipe 4 Airtight partition 10 Side wall 11 Manhole 22, 32 Plug 41 Cylindrical sheet (tubular sheet)
60 Compressed air 61 Air hose (hose)

Claims (3)

地中に埋設されるマンホールの側壁に連結した下水道管を塞ぎ、
マンホール内に筒状シートを配するとともに、前記マンホールの内側上部に気密隔壁を取り付け、
隔壁下側のマンホール内を加圧状態にし、
前記側壁の貫通を伴う様々な作業を、隔壁下側の加圧状態のマンホール内から行うことを特徴とする加圧式マンホール施工方法。
Block the sewer pipe connected to the side wall of the manhole buried in the ground,
While arranging a cylindrical sheet in the manhole, an airtight partition is attached to the inner upper part of the manhole,
Pressurize the inside of the manhole under the bulkhead,
A pressurizing manhole construction method characterized in that various operations involving the penetration of the side wall are performed from within a pressurized manhole below the partition wall.
鉛直に地中へ埋設されるマンホールの下方側壁に連結した下水道管の管路を栓で塞ぎ、 マンホール内に筒状シートを配するとともに、前記マンホールの内側上部に気密隔壁を略水平に取り付け、
前記気密隔壁を貫通するホースを介して、隔壁下側のマンホール内へ圧搾空気を送り込んで加圧し、
前記側壁の貫通を伴う様々な作業を、隔壁下側の加圧状態のマンホール内から行うことを特徴とする加圧式マンホール施工方法。
The pipe of the sewer pipe connected to the lower side wall of the manhole vertically buried in the ground is closed with a stopper, a cylindrical sheet is arranged in the manhole, and an airtight partition wall is attached to the upper part inside the manhole substantially horizontally.
Via a hose penetrating the hermetic partition, compressed air is sent into the manhole below the partition and pressurized,
A pressurizing manhole construction method characterized in that various operations involving the penetration of the side wall are performed from within a pressurized manhole below the partition wall.
鉛直に地中へ埋設されるマンホールの下方側壁に連結した下水道管の管路を栓で塞ぎ、 下側に円筒状シートを吊り下げた気密隔壁を、前記マンホールの内側上部に略水平に取り付け、
前記気密隔壁を貫通するホースを介して、隔壁下側のマンホール内へ圧搾空気を送り込み、
マンホール外側の地中水圧と釣り合う気圧になる様に、マンホール内を徐々に加圧し、 マンホール側壁の貫通を伴う様々な作業を、隔壁下側の加圧状態のマンホール内から行って完了させ、
貫通穴を塞いだ後に、前記ホースを介して排気してマンホール内の気圧を徐々に外気圧に戻し、
前記気密隔壁をマンホール外へ撤去して終了する加圧式マンホール施工方法。
Plug the sewer pipe line connected to the lower side wall of the manhole vertically buried in the ground with a stopper, and attach an airtight partition wall with a cylindrical sheet suspended on the lower side to the upper part inside the manhole.
Via a hose penetrating the airtight partition, compressed air is sent into the manhole below the partition,
The inside of the manhole is gradually pressurized so that the air pressure is balanced with the underground water pressure outside the manhole, and various operations involving the penetration of the manhole side wall are performed from the inside of the pressurized manhole under the partition wall,
After closing the through hole, exhaust the air through the hose and gradually return the pressure inside the manhole to the outside pressure.
A pressurizing manhole construction method which is completed by removing the airtight partition wall from the manhole.
JP2006036452A 2006-02-14 2006-02-14 Construction method for pressurized manhole Pending JP2007217878A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006036452A JP2007217878A (en) 2006-02-14 2006-02-14 Construction method for pressurized manhole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006036452A JP2007217878A (en) 2006-02-14 2006-02-14 Construction method for pressurized manhole

Publications (1)

Publication Number Publication Date
JP2007217878A true JP2007217878A (en) 2007-08-30

Family

ID=38495458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006036452A Pending JP2007217878A (en) 2006-02-14 2006-02-14 Construction method for pressurized manhole

Country Status (1)

Country Link
JP (1) JP2007217878A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015007339A (en) * 2013-06-25 2015-01-15 日之出水道機器株式会社 Repair device and repair technique for invert and straight wall part of underground structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015007339A (en) * 2013-06-25 2015-01-15 日之出水道機器株式会社 Repair device and repair technique for invert and straight wall part of underground structure

Similar Documents

Publication Publication Date Title
WO2020173100A1 (en) Reinforcement apparatus and construction method for local freezing reinforcement of deep foundation pit in water-rich sand gravel stratum
JP5212070B2 (en) Common well and construction method of regular well
JP6650348B2 (en) Underground diaphragm wall construction method, underground diaphragm wall
JP2009068213A (en) Construction method for underground structure using caisson, and caisson with cut-off device
JP2016011550A (en) Tunnel construction method
JP4917940B2 (en) Tunnel construction method
KR100880365B1 (en) Excavating apparatus for excavating enlarged hole under the bottom of waters on which jacket facility structure is installed
JP5198992B2 (en) Ground injection device and ground improvement method using the same
CN111828025B (en) Shield receiving construction method and receiving tunnel portal water stopping device
JP2007217878A (en) Construction method for pressurized manhole
KR100823980B1 (en) Drain combination paker type pressurization grouting equipment and the upward method using the same
CN212154142U (en) Detachable bolt hole plugging structure of protective sealing wall
CN107268688B (en) Construction method for reinforcing and sealing I-shaped steel joint of underground continuous wall
JP3264437B2 (en) Water shielding device and method of measuring water permeability
JP2006070469A (en) Well construction method
CN105908746A (en) Pile body concrete drilled core grout recharging device and method
KR200229369Y1 (en) Grout cement leakage blocking device in deep well
KR101525986B1 (en) Apparatus and method for sealing carbon storage in ground
JP2576945B2 (en) Construction method of manhole combined sinking pit and cutting edge to promote sinking
CN216839456U (en) Post grouting device for pile end of steel pipe pile
JPH10176329A (en) Temporary anchor and temporary anchor execution working method
JP3540400B2 (en) Piping method of fluid pipe
JP4807930B2 (en) Water intake construction method
JP4323075B2 (en) Shaft opening structure
JP6022404B2 (en) Caisson groundwater flow suppression structure and groundwater flow suppression method

Legal Events

Date Code Title Description
A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20080117