JP5268712B2 - Seismic retrofitting method and equipment for manhole and sewer pipe connections - Google Patents

Seismic retrofitting method and equipment for manhole and sewer pipe connections Download PDF

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JP5268712B2
JP5268712B2 JP2009049654A JP2009049654A JP5268712B2 JP 5268712 B2 JP5268712 B2 JP 5268712B2 JP 2009049654 A JP2009049654 A JP 2009049654A JP 2009049654 A JP2009049654 A JP 2009049654A JP 5268712 B2 JP5268712 B2 JP 5268712B2
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manhole
pipe
sewer pipe
groove
rotary blade
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JP2010203141A (en
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朋廣 花原
敏行 出口
尚平 岩崎
田中  勉
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Tokyo Metropolitan Sewerage Service Corp
Nippon Hume Corp
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Tokyo Metropolitan Sewerage Service Corp
Nippon Hume Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a load and a risk on a worker by eliminating an operation for removing an invert at the bottom of a manhole and reduce construction time and cost, in an aseismic construction method in which a gap is formed in a manhole side-wall around a sewage pipe for providing earthquake resistance to the connected portion of the manhole and the sewage pipe and a damping material is filled in the gap. <P>SOLUTION: This construction method includes a first step of forming, in the manhole side-wall, a groove 34 which is recessed a predetermined depth into the manhole side-wall circumferentially in the wall of the sewage pipe from the inside of the end of the sewage pipe, a second step of slitting the sewage pipe by pressing a cutting tool 36 in which a crank pin is used as a shaft-like rotary blade 39 in the radial direction from the inner groove edge of the pipe end while rotating the rotary blade, changing the direction and circumferentially turning around the pipe end after the rotary blade cuts off the pipe end, and cutting the sidewall of the manhole around the pipe end to form an annular gap which is brought into contact with the pipe end around the pipe end, and a third step of filling a rubber or resin damping material into the gap. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、マンホールと下水道管との接続部分に耐震性を持たせるため下水道管の周りのマンホール側壁に空隙を形成し、形成した空隙に緩衝材を充填することよりなる耐震化工法と、該工法で用いられる装置に関する。   The present invention provides a seismic improvement method comprising forming a gap in the side wall of the manhole around the sewer pipe, and filling the formed gap with a buffer material in order to give seismic resistance to the connecting portion between the manhole and the sewer pipe, The present invention relates to a device used in the construction method.

マンホールは、下水道管の検査や清掃のため人が出入りできるようにするために設けられ、図1に示すように下水道管1がマンホール2側壁に固定され、マンホール内に開口している。   The manhole is provided so that a person can go in and out for the inspection and cleaning of the sewer pipe. As shown in FIG. 1, the sewer pipe 1 is fixed to the side wall of the manhole 2 and opens into the manhole.

図示するようなマンホールにおいて、地震により下水道管1が上下に、或いは前後左右に揺れると、マンホール側壁に固定される下水道管端部が破損するおそれがある。このため近年では、マンホール側壁と下水道管端部を接続する部分に可撓性を持たせて地震時の揺れを吸収できるようにしているが、こうした技術が施されていない既設のマンホールに対しては、マンホール側壁と下水道管端部との接続部分に耐震性を持たせるために下水道管の周りのマンホール側壁にドリル又はコアビットを用いて貫通し或いは貫通しない程度の孔を繰返しあけて下水道管の周りに連続した環状の空隙を形成するか、或いはマンホール側壁に孔をあけるエンドミルカッター又はジェット水噴射ノズルを下水道管の周りに旋回させて環状の空隙を形成し、ついで環状の空隙に弾力性のあるゴムやプラスチック製の緩衝材を充填する工法が提案されている(特許文献1、2)。   In the manhole as shown, if the sewer pipe 1 swings up and down or back and forth and left and right due to an earthquake, the end of the sewer pipe fixed to the manhole side wall may be damaged. For this reason, in recent years, the portion connecting the manhole side wall and the end of the sewer pipe has been made flexible so that it can absorb vibrations during an earthquake. In order to provide seismic resistance to the connecting part between the manhole side wall and the end of the sewer pipe, the manhole side wall around the sewer pipe is repeatedly drilled with a drill or a core bit to the extent that it does not penetrate or penetrate the sewer pipe. Form an annular gap around the sewer pipe by forming a continuous annular gap around it, or swiveling an end mill cutter or jet water injection nozzle that drills a hole in the side wall of the manhole around the sewer pipe. A method of filling a certain rubber or plastic cushioning material has been proposed (Patent Documents 1 and 2).

特開2002−227226号公報JP 2002-227226 A 特開2001−40751号公報JP 2001-40751 A

前述する従来の工法においては、下水道管の周りに穿孔工具を旋回させるためのスペースを確保するため、図1に示すマンホール底部のインバート3を一旦撤去しなければならない。この撤去はハツリ作業によって行われるが、この作業には、作業員が長時間にわたってマンホールの中に入って行わねばならないことから、作業者への負担や危険性をもたらすうえ、施工時間、施工費用がかさむ。またハツリ取ったインバートは元の状態に復旧せねばならず、復旧作業も作業者の負担となり、手間や費用がかかる。   In the conventional method described above, the invert 3 at the bottom of the manhole shown in FIG. 1 must be removed once in order to secure a space for turning the drilling tool around the sewer pipe. This removal is done by chiseling, but this work requires the worker to enter the manhole for a long time, causing burden and danger to the worker, as well as construction time and construction cost. It's tedious. In addition, the scraped invert must be restored to its original state, and the restoration work is burdened by the operator, which takes time and cost.

またマンホールは円筒状のものが主流で、これにほぼ直交するように接続される下水道管も円筒状をなしている。図2はマンホール側壁と下水道管1の接続部4の形状を示すもので、下水道管1の周りに環状の空隙を形成する場合、空隙が三次元的に歪んだ環状のものとなる。図中、3はインバートを示す。このインバートは図示するように、下水道管管端面の下側部を覆い、表面が下水道管管端部の内周と段差のない円弧状をなしている。   In addition, cylindrical manholes are mainly used, and sewer pipes connected so as to be almost orthogonal to the manholes are also cylindrical. FIG. 2 shows the shape of the connecting portion 4 between the manhole side wall and the sewer pipe 1. When an annular gap is formed around the sewer pipe 1, the gap is a three-dimensionally distorted ring. In the figure, 3 indicates invert. As shown in the figure, this invert covers the lower part of the end face of the sewer pipe pipe, and the surface has an arc shape with no step from the inner periphery of the end of the sewer pipe pipe.

本発明は、マンホールと下水道管との接続部分に耐震性を持たせるため下水道管の周りのマンホール側壁に空隙を形成し、形成した空隙に緩衝材を充填することよりなる耐震化工法において、マンホール底部のインバートの撤去作業をなくすか、極力少なくして作業者の負担や危険性をなくすか、或いは極力少なくし、施工時間や費用を低減させることを第1の目的とし、下水道管の周りの空隙を容易かつ確実に形成することができるようにするために用いる装置を提供することを第2の目的とする。   The present invention relates to a seismic construction method in which a gap is formed in a side wall of a manhole around a sewer pipe and a buffer material is filled in the formed gap in order to give a seismic resistance to a connection portion between the manhole and the sewer pipe. The primary objective is to eliminate the bottom invert removal work, or to reduce the burden and danger of the operator by reducing it as much as possible, or to reduce the construction time and cost as much as possible. A second object is to provide an apparatus used for easily and reliably forming a void.

請求項1に係わる発明は、マンホールと下水道管との接続部分に耐震性を持たせるための工法であって、マンホール側壁にマンホールとほぼ直交して接続される下水道管のマンホール側壁に支持される管端部に対し、その内側から下水道管壁にマンホール側壁に一定深さ食い込むまでの溝を管端部の全周にわたって形成する第1工程と、クランクアームと直交して突出するクランクピンを軸状の回転刃とした形態をなす切削工具を用い、前記回転刃を管軸方向に向け、かつクランクアームを下水道管の径方向であって、第1工程において形成された環状の溝に向けた状態で、回転刃をその軸中心の回りに回転させながら、管端部の内側の前記環状溝の溝縁から径方向に押込んで切込みを入れ、回転刃が管端部を突き切ると、方向転換して管端部の周りに周方向に旋回させ、これにより管端部の周りのマンホール側壁を切削して管端部の周りに管端部と接する環状の空隙を形成する第2工程と、形成された空隙にゴムや樹脂製の緩衝材を充填する第3工程とからなることを特徴とする。   The invention according to claim 1 is a method for imparting earthquake resistance to the connecting portion between the manhole and the sewer pipe, and is supported on the manhole side wall of the sewer pipe connected to the manhole side wall substantially orthogonally to the manhole. A first step of forming a groove from the inner side of the pipe end part to the sewer pipe wall into the manhole side wall at a certain depth, and a crank pin protruding perpendicularly to the crank arm A cutting tool in the form of a cylindrical rotary blade, the rotary blade is directed in the pipe axis direction, and the crank arm is directed in the radial direction of the sewer pipe and directed to the annular groove formed in the first step In this state, while rotating the rotary blade around its axial center, the radial edge is pushed in from the groove edge of the annular groove inside the pipe end to make a cut, and the direction of the rotary blade penetrates the pipe end. Switch to pipe end In the circumferential direction, thereby cutting the manhole side wall around the pipe end to form an annular gap around the pipe end and in contact with the pipe end, and the formed gap And a third step of filling a rubber or resin cushioning material.

請求項2に係わる発明は、請求項1に係わる発明の第1工程において、管端部の全周にわたって形成される環状の溝が管端面に達する溝であり、第2工程において使用される回転刃が管端部の内側の環状溝の溝縁から径方向に切込みを入れる代わりにマンホール側壁に形成される環状溝の溝側面から管軸方向に押込んで切込みを入れ、一定深さ切込み、切削工具のクランクアームが前記環状溝に納まったのち、方向転換して管端部の周りに周方向に旋回させ、これにより管端部の周りのマンホール側壁を切削して管端部の周りに管端部と接する環状の空隙を形成することを特徴とする。   The invention according to claim 2 is the first step of the invention according to claim 1, wherein the annular groove formed over the entire circumference of the tube end reaches the tube end surface, and the rotation used in the second step. Instead of cutting in the radial direction from the groove edge of the annular groove inside the pipe end, the blade pushes in the axial direction from the groove side surface of the annular groove formed on the side wall of the manhole to make a constant depth cut, cutting After the tool's crank arm is in the annular groove, it turns and turns circumferentially around the tube end, thereby cutting the manhole side wall around the tube end and the tube around the tube end. An annular gap is formed in contact with the end portion.

請求項に係る発明は、請求項1又は2に係わる発明の第1工程及び若しくは第2工程を実施する際に使用する装置に関するもので、下水道管内に下水道管と同軸をなして取外し可能に固定され、切削工具が旋回可能に装着される旋回用レールと、該旋回用レールに固定され、切削工具に設けたならい用治具がスライド可能に係合するガイドを備えたガイド部材よりなり、前記ガイドは図2に示すマンホール側壁と下水道管の歪んだ三次元形状の環状の接続部4と同一形状をなし、切削工具が旋回用レールに沿って旋回する際、前記ならい用治具がガイドに案内されてスライドすることにより切削工具が管軸方向に移動しながら旋回することを特徴とする。
The invention according to claim 3 relates to an apparatus used when carrying out the first step and / or the second step of the invention according to claim 1 or 2 , and can be removed in the sewer pipe coaxially with the sewer pipe. A turning rail that is fixedly mounted so that the cutting tool is turnable, and a guide member that is fixed to the turning rail and includes a guide that is slidably engaged with a jig that is provided on the cutting tool, The guide has the same shape as the distorted three-dimensional annular connecting portion 4 of the manhole side wall and the sewer pipe shown in FIG. 2, and when the cutting tool turns along the turning rail, the profiling jig guides the guide. The cutting tool is swung while being moved in the tube axis direction by being guided and slid.

請求項に係わる発明は、請求項に係わる発明のガイド部材が一つの部材よりなるか、或いは複数の部材を周方向に組み合わせて形成されることを特徴とし、
請求項に係わる発明は、請求項に係わる発明のガイド部材が周方向に適当間隔をおいて並べた管軸方向の多数のロッドよりなり、各ロッドはそれぞれ旋回用レールに管軸方向に位置調整可能に止着され、各一端が前記ガイドを形成することを特徴とする。
The invention according to claim 4 is characterized in that the guide member of the invention according to claim 3 is formed of one member, or is formed by combining a plurality of members in the circumferential direction.
In the invention according to claim 5 , the guide member of the invention according to claim 3 is composed of a number of rods in the tube axis direction arranged at appropriate intervals in the circumferential direction, and each rod is respectively connected to the turning rail in the tube axis direction. It is fixed so that position adjustment is possible, and each end forms the guide.

請求項1及び2に係わる発明によると、第1工程において形成される環状の溝は、インバートと接するか、或いは離れて形成されるためインバートをハツったり、復旧する作業が不要となり、従来工法のようなインバートをハツったり復旧に要する作業者の負担や危険が解消され、インバートをハツる手間や費用を不要にできる。   According to the first and second aspects of the invention, the annular groove formed in the first step is formed in contact with or apart from the invert, so that it is not necessary to remove or restore the invert. As a result, the burden and danger of workers who need to recover and recover such inverts can be eliminated, and the labor and expense of inverting can be eliminated.

請求項に係わる発明によると、環状の溝及び若しくは管端部の周りの環状の空隙が図2に示す接続部4の形状通り精度よく、容易かつ確実に形成することができる。
請求項に係わる発明によると、ガイド部材が一つの部材で構成される場合、組付けや分解が不要となり、また複数の部材で構成される場合には、分解することによって下水道管内への持込みや持ち運びが容易となる。
According to the third aspect of the present invention, the annular groove and / or the annular gap around the pipe end can be formed easily and reliably with high accuracy according to the shape of the connecting portion 4 shown in FIG.
According to the invention according to claim 4 , when the guide member is composed of one member, assembly or disassembly is not necessary, and when it is composed of a plurality of members, it is brought into the sewer pipe by disassembling. And easy to carry.

また図2に示す接続部4の形状はマンホールや下水道管のサイズによって変化するが、請求項に係わる発明によると、ロッドの出し入れを調整し、管軸方向に位置調整することにより、図2に示す接続部4がどのような形状であってもロッド端によって形成されるガイドを接続部4の形状に合致させることができる。 The shape of the connecting portion 4 shown in FIG. 2 varies depending on the size of the manhole or sewer pipe. According to the invention according to claim 5 , by adjusting the insertion and removal of the rod and adjusting the position in the direction of the pipe axis, FIG. The guide formed by the rod end can be matched with the shape of the connecting portion 4 regardless of the shape of the connecting portion 4 shown in FIG.

マンホールの断面図。Sectional drawing of a manhole. マンホール側壁に接続される下水道管の接続部を示す斜視図。The perspective view which shows the connection part of the sewer pipe connected to a manhole side wall. 下水道管に取付けた旋回用レールとガイド部材を示す図。The figure which shows the rail for rotation and the guide member attached to the sewer pipe. 下水道管に取付けられるガイド部材の別の例を示す図。The figure which shows another example of the guide member attached to a sewer pipe. 溝形成用の切削工具を示す正面図。The front view which shows the cutting tool for groove formation. 回転刃が管端部に切り込んだ状態を示す図。The figure which shows the state which the rotary blade cut into the pipe end part. 切込溝が形成された状態を示す図。The figure which shows the state in which the notch groove was formed. 溝を掘り下げる切削刃を示す正面図。The front view which shows the cutting blade which digs a groove | channel. 掘り下げられた溝を示す図。The figure which shows the groove dug down. 空隙形成用の切削工具を示す正面図。The front view which shows the cutting tool for space | gap formation. 回転刃により切込みを入れて溝を形成した状態を示す図。The figure which shows the state which cut | notched with the rotary blade and formed the groove | channel. 空隙を形成した状態を示す図。The figure which shows the state which formed the space | gap. 空隙を形成する別の方法を示す図。The figure which shows another method of forming a space | gap. 管端部への切込みの別の例を示す図。The figure which shows another example of the notch | incision to a pipe end part. 緩衝材を充填して復旧した状態を示す図。The figure which shows the state which filled with the buffer material and was restored. インバートに切込溝を形成した状態を示す図。The figure which shows the state which formed the cut groove in the invert. 切込溝を掘り下げた状態を示す図。The figure which shows the state which dug down the cut groove. インバートへの切込みの別の例を示す図。The figure which shows another example of the cut to invert. 溝形成の別の例を示す図。The figure which shows another example of groove | channel formation. 空隙を形成する別の例を示す図。The figure which shows another example which forms a space | gap. 緩衝材を充填して復旧した状態を示す図。The figure which shows the state which filled with the buffer material and was restored.

以下、本発明の実施形態について図面により説明する。
図3は、請求項1に係わる発明の第1又は第2工程で使用する装置に関するもので、下水道管1内に下水道管1と同軸をなして取外し可能に固定される環状の旋回用レール11と、該レール11の管端面側に該レールと同軸をなして固定されるガイド部材12よりなり、該ガイド部材12は全体が一体であるか又は複数の部材に分割されて環状に組付けられ、図2に示す接続部4と同一形状をなす環状のガイド12aと、周方向に適当間隔をおいて管軸方向に伸び、前記ガイド12aとレール11とを連結してガイド12aを支持する多数のロッド12bよりなっている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 3 relates to an apparatus used in the first or second step of the invention according to claim 1, and an annular swiveling rail 11 that is coaxially and separably fixed to the sewer pipe 1 in the sewer pipe 1. And a guide member 12 fixed coaxially with the rail on the pipe end surface side of the rail 11, and the guide member 12 is integrated as a whole or divided into a plurality of members and assembled in an annular shape. 2, a ring-shaped guide 12a having the same shape as the connecting portion 4 shown in FIG. 2, and extending in the tube axis direction at an appropriate interval in the circumferential direction, and connecting the guide 12a and the rail 11 to support the guide 12a. Rod 12b.

図4は、同じく第1工程又は第2工程で使用する別の装置に関するもので、前記旋回用レール11と同一構造の旋回用レール15と、ガイド部材16よりなり、該ガイド部材16は周方向に適当間隔をおいて並べた多数のロッド17よりなり、各ロッド17はそれぞれレール15に管軸方向に抜差し可能に差込まれ、図示しないネジにて旋回用レール15に止着されて管軸方向に位置調整可能となっており、管端面側のロッド端により図2に示す接続部4と同一形状のガイド18を形成するようになっている。   FIG. 4 also relates to another apparatus used in the first step or the second step, and includes a turning rail 15 having the same structure as the turning rail 11 and a guide member 16, the guide member 16 being in the circumferential direction. The rods 17 are inserted into rails 15 so that they can be inserted and removed in the direction of the tube axis, and are fastened to the turning rails 15 by screws (not shown). The position can be adjusted in the direction, and a guide 18 having the same shape as the connecting portion 4 shown in FIG. 2 is formed by the rod end on the tube end face side.

図3に示すガイド部材12では、マンホール2のサイズや下水道管1の口径により図2に示す接続部4の形状が変化すると、その形状に応じたガイド部材12を用意する必要があり、接続部3の形状によって多数のガイド部材12が必要となるが、図4に示すガイド部材16はロッド17の軸方向の位置調整によってロッド端により形成されるガイド18の形状を図2に示す前記接続部4の形状に合わせて変更することができる。   In the guide member 12 shown in FIG. 3, when the shape of the connecting portion 4 shown in FIG. 2 changes depending on the size of the manhole 2 or the diameter of the sewer pipe 1, it is necessary to prepare the guide member 12 corresponding to the shape. 3 requires a large number of guide members 12, but the guide member 16 shown in FIG. 4 has the shape of the guide 18 formed by the rod end by adjusting the position of the rod 17 in the axial direction. It can be changed according to the shape of 4.

図5は、請求項1に係わる発明の第1工程において、環状の溝を形成するのに使用する切削工具21を示すもので、前記旋回用レール11にスライド可能に装着され、旋回用レール11に沿って旋回するベース22と、該ベース22より径方向に突出する支柱23と、該支柱23に昇降可能に支持されるブロック24と、該ブロック24に支柱23と直交して管軸方向にスライド可能に差込まれるスライドロッド25と、該スライドロッド端に固着の取付台26と、径方向を向いて取付台26に着脱可能に取付けられる回転刃27と、回転刃27をその軸中心の周りに回転させるドリル28と、前記取付台26に取付けられ、図3に示すガイド部材12のガイド12aに係合する、ならい用治具としてのならい用ローラ29とからなり(ならい用治具として図4に示すガイド部材16を用いた場合には、ならい用ローラ29に代え、複数のロッド17に跨ってガイド18を移動するソリ19が用いられる)、また図示していないが、前記ベース22には、該ベース22を旋回用レール11に沿って旋回させる作動機構が、またブロック24には該ブロック24を支柱23に沿って昇降させる昇降機構が設けられている。   FIG. 5 shows a cutting tool 21 used to form an annular groove in the first step of the invention according to claim 1. The cutting tool 21 is slidably mounted on the turning rail 11. A base 22 pivoting along the base 22, a support 23 projecting radially from the base 22, a block 24 supported by the support 23 so as to be movable up and down, and the block 24 perpendicular to the support 23 in the tube axis direction. A slide rod 25 that is slidably inserted, a mounting base 26 fixed to the end of the slide rod, a rotary blade 27 that is detachably attached to the mounting base 26 in a radial direction, and the rotary blade 27 at its center. A drill 28 that rotates around and a guide roller 29 that is attached to the mount 26 and engages with the guide 12a of the guide member 12 shown in FIG. When the guide member 16 shown in FIG. 4 is used as the jig, a sled 19 that moves the guide 18 across the plurality of rods 17 is used in place of the follower roller 29). The base 22 is provided with an operating mechanism for turning the base 22 along the turning rail 11, and the block 24 is provided with an elevating mechanism for raising and lowering the block 24 along the column 23.

ベース22をレール11に沿って旋回させる作動機構としては、例えばレール11に沿って取付けられる環状のラックと、該ラックと噛合し、モータによって回転駆動されるピニオンよりなるピニオンラック機構を用いることができる。   As an operation mechanism for turning the base 22 along the rail 11, for example, an annular rack attached along the rail 11 and a pinion rack mechanism that meshes with the rack and is rotated by a motor are used. it can.

ブロック24を支柱23に沿って昇降させる昇降機構に関しても同様にピニオンラック機構を用いることができ、これら機構は図示しないコントローラ、好ましくは作業者が携帯可能な携帯用のコントローラによって制御されるようになっている。   Similarly, a pinion rack mechanism can be used for the raising / lowering mechanism that raises and lowers the block 24 along the column 23, and these mechanisms are controlled by a controller (not shown), preferably a portable controller that can be carried by the operator. It has become.

請求項1に係わる発明の第1工程は次のようにして行われる。
先ず、下水道管内の管端部1a近くの適所に旋回用レール11を、続いてその管端面側にガイド部材12を取付ける。このガイド部材12は、旋回用レール11に固定した状態で旋回用レール11と共に下水道管1に取付けてもよい。なお、ガイド部材12は、図4に示すガイド部材16に替えてもよいが、以下の説明ではガイド部材12を用いた例について説明する。
The first step of the invention according to claim 1 is performed as follows.
First, the turning rail 11 is attached to an appropriate position near the pipe end 1a in the sewer pipe, and then the guide member 12 is attached to the pipe end face side. The guide member 12 may be attached to the sewer pipe 1 together with the turning rail 11 while being fixed to the turning rail 11. The guide member 12 may be replaced with the guide member 16 shown in FIG. 4, but in the following description, an example using the guide member 12 will be described.

旋回用レール11とガイド部材12を下水道管1に取付後、切削工具21を旋回用レール11に取付けるが、切削工具21についても旋回用レール11に予め取付けておいてもよい。   The cutting tool 21 is attached to the turning rail 11 after the turning rail 11 and the guide member 12 are attached to the sewer pipe 1, but the cutting tool 21 may also be attached to the turning rail 11 in advance.

次に切削工具21の取付台26、ドリル28又はその他の箇所を掴んでスライドロッド25と共に管軸方向に進退させ、径方向を向く回転刃27の先端を管端部1aの切削予定箇所31に合わせて位置決めする。位置決め後、コントローラの操作によりドリル28を駆動し、かつ前記昇降機構を作動して回転刃27を回転させながら径方向外方に一定速度で送り、回転刃先端を切削予定個所31に当てる。そしてそのまま押込んで下水道管管端部1aへの径方向の穿孔を行う。   Next, the mounting base 26, the drill 28 or other part of the cutting tool 21 is grasped and moved forward and backward in the tube axis direction together with the slide rod 25, and the tip of the rotary blade 27 facing in the radial direction is set as the planned cutting part 31 of the pipe end 1a. Position them together. After positioning, the drill 28 is driven by the operation of the controller, and the elevating mechanism is operated to rotate the rotary blade 27 at a constant speed while rotating the rotary blade 27, and the tip of the rotary blade is applied to the planned cutting location 31. And it pushes in as it is, and perforation of the radial direction to the sewer pipe end part 1a is performed.

回転刃27の径方向外方への送りは、目視で確認しながら行うか、或いは例えばコントローラに予め読み込んでおいた下水道管1の肉厚に相当する目標値に達するまで行われ、回転刃27の先端がマンホール2の側壁に達すると、ならい用コントローラ29がガイド部材12のガイド12aに係合する。そしてコントローラの操作により、或いは回転刃27の送りが目標値に達したときのコントローラからの出力により昇降機構による径方向への送りを停止すると共に、ベース旋回用の作動機構を作動させる。   The feed of the rotary blade 27 outward in the radial direction is performed while visually confirming or until the target value corresponding to the thickness of the sewer pipe 1 read in advance in the controller is reached, for example. When the tip of the guide reaches the side wall of the manhole 2, the follow-up controller 29 engages with the guide 12a of the guide member 12. Then, by the operation of the controller or by the output from the controller when the feed of the rotary blade 27 reaches the target value, the feed by the lifting mechanism in the radial direction is stopped and the base turning operation mechanism is operated.

作動機構が作動すると、ならい用コントローラ29がガイド12aに案内されて転動することによりベース22がガイド12aの形状に沿い管軸方向に進退しながらレール11に沿って旋回する。これに伴い回転刃27も同方向に旋回し(図6)、図の二点鎖線で示す切削予定箇所31に沿った切込みを行う。回転刃27が管端部1aを一周すると、管端部1aの切削予定箇所31に沿い、図2の接続部4の形状に合致した環状の切込溝32が形成され、それを目視により確認することにより、或いはまた例えば作動機構及びドリル28の負荷が低下することで、それを検出した検出信号によりコントローラがドリル28を停止させると共に、ブロック24の昇降機構を作動させ、回転刃27を持ち上げて切込溝32より離脱させる(図7)。その後、切込溝32により縁切りされたリング状の下水道管先端部1bをハツリ作業により躯体から剥がし取って幅広の溝34(図8参照)を形成する。   When the actuating mechanism is actuated, the follower controller 29 is guided by the guide 12a and rolls, whereby the base 22 turns along the rail 11 while moving forward and backward in the tube axis direction along the shape of the guide 12a. Along with this, the rotary blade 27 also turns in the same direction (FIG. 6), and performs cutting along the planned cutting location 31 indicated by a two-dot chain line in the figure. When the rotary blade 27 goes around the pipe end 1a, an annular cut groove 32 that matches the shape of the connection part 4 in FIG. 2 is formed along the planned cutting location 31 of the pipe end 1a. Or, for example, when the load of the operating mechanism and the drill 28 is reduced, the controller stops the drill 28 according to the detection signal that has been detected, and operates the lifting mechanism of the block 24 to lift the rotary blade 27 To be separated from the cut groove 32 (FIG. 7). Thereafter, the ring-shaped sewer pipe tip 1b edged by the notch groove 32 is peeled off from the housing by a chiseling operation to form a wide groove 34 (see FIG. 8).

下水道管先端部1bを剥がし取って幅広の溝34を形成したのち、回転刃27に代えてドリル28に漏斗状の切削刃33を取付け、切削刃33を回転させながら径方向外方に送り、幅広の溝34を更に深く切削する(図8)。この溝34の切削は、スライドロッド25に取付台26に代えて取付けた後述の空隙形成用の切削工具36による空隙形成が可能となる程度まで行われ、空隙形成は目視により確認しながら行うか、或いはコントローラに予め読み込んでおいた目標値に達するまで行われる。   After separating the sewer pipe tip 1b to form a wide groove 34, a funnel-shaped cutting blade 33 is attached to the drill 28 in place of the rotary blade 27, and the cutting blade 33 is rotated and fed radially outward. The wide groove 34 is cut deeper (FIG. 8). The groove 34 is cut to such an extent that a gap can be formed by a later-described gap forming cutting tool 36 attached to the slide rod 25 instead of the mounting base 26. Or, it is performed until the target value read in advance in the controller is reached.

切削刃33による溝34の掘り下げが管端部1aの全周にわたって行われると、前述した回転刃27と同様の方法により、切削刃33が引上げられる(図9)。
以上のようにして請求項1に係わる発明の第1工程が終了する。
When the groove 34 is dug down by the cutting blade 33 over the entire circumference of the pipe end 1a, the cutting blade 33 is pulled up by the same method as the rotary blade 27 described above (FIG. 9).
As described above, the first step of the invention according to claim 1 is completed.

前述する例では、回転刃27による切込溝32の形成・下水道管先端部のハツリ・切削刃33による溝34の掘り下げの順に所定深さの溝34が形成されるようになっているが、切込溝32を形成したり、下水道管先端部1bをハツることなく、切削刃33のみを用いて所定深さの溝34を形成することも可能である。しかしながらこの場合、切削刃33の損耗が激しくなり、好ましくない。なお切削刃33のみで溝34の形成を行う場合には、マンホール側壁に支持される下水道管管端部1aの適所にインバート3と接しない溝34の形成を行うこともできる。   In the example described above, the groove 34 having a predetermined depth is formed in the order of the formation of the cutting groove 32 by the rotary blade 27, the chipping at the tip of the sewer pipe, and the groove 34 by the cutting blade 33. It is also possible to form the groove 34 having a predetermined depth by using only the cutting blade 33 without forming the cut groove 32 or removing the sewer pipe tip 1b. However, in this case, wear of the cutting blade 33 becomes severe, which is not preferable. When the groove 34 is formed only by the cutting blade 33, the groove 34 that does not contact the invert 3 can be formed at an appropriate position of the sewer pipe end 1a supported by the side wall of the manhole.

第1工程終了後、請求項1に係わる発明の第2工程が次のようにして行われる。
先ずスライドロッド25から取付台26をドリル28ごと取外し、空隙形成用の切削工具36に付け替える(図10)。この切削工具36はスライドロッド25に取外し可能に取付けられるクランクアームの形態をなすブラケット37と、該ブラケット37の一側上部に取付けられるドリル38と、ブラケット37の他側下部に取付けられるクランクピンの形態をなし、管軸方向を向く軸状の回転刃39と、ブラケット内に組み込まれ、ドリル38から回転刃39への作動機構(図示しない)と、前述のガイド12aに係合可能なならい用ローラ40とよりなっており、ブラケット37は少なくとも径方向外側部(図の下側部)が溝34幅より細幅で溝34に遊びを存して装入できるようになっている。
After the first step is completed, the second step of the invention according to claim 1 is performed as follows.
First, the mounting base 26 is removed from the slide rod 25 together with the drill 28, and is replaced with a cutting tool 36 for forming a gap (FIG. 10). The cutting tool 36 includes a bracket 37 in the form of a crank arm that is removably attached to the slide rod 25, a drill 38 attached to one upper part on the bracket 37, and a crank pin attached to the other lower part on the bracket 37. A shaft-shaped rotary blade 39 that has a form and faces the tube axis direction, an operating mechanism (not shown) from the drill 38 to the rotary blade 39, and a guide 12a that can be engaged with the guide 12a. The bracket 37 is composed of a roller 40, and at least the radially outer side (the lower side in the figure) is narrower than the width of the groove 34, so that the groove 34 can be inserted with play.

スライドロッド25端に切削工具36を取付けたのち、回転刃39の位置決めを前述した回転刃27の位置決めと同様の方法によって行い、位置決め後、コントローラの操作によりドリル38を駆動し、かつブロック24の昇降機構を作動して回転刃39を回転させながら径方向外方に送り、マンホール側壁に支持される管端部1aに当てる。そしてそのまま押込んで管軸方向に切込みを行う。   After attaching the cutting tool 36 to the end of the slide rod 25, the rotary blade 39 is positioned by the same method as the positioning of the rotary blade 27 described above. After positioning, the drill 38 is driven by the operation of the controller, and The lifting mechanism 39 is actuated to rotate the rotary blade 39 and feed it radially outward to hit the tube end 1a supported on the side wall of the manhole. And it pushes in as it is and cuts in a pipe axis direction.

回転刃39の径方向外方への送りは、前述の回転刃27と同様の方法により回転刃39が管端部1aを突き切り、マンホール側壁に達するまで行われ(図11)、マンホール側壁に達すると、ならい用ローラ40がガイド12aに係合する。この状態でコントローラの操作により昇降機構を停止させると共に、作動機構を作動させる。   The rotary blade 39 is fed outward in the radial direction until the rotary blade 39 penetrates the tube end 1a and reaches the manhole side wall by the same method as the above-described rotary blade 27 (FIG. 11). When reached, the profile roller 40 engages the guide 12a. In this state, the lifting mechanism is stopped by operating the controller, and the operating mechanism is operated.

作動機構の作動により切削工具36がガイド12aに案内されて管軸方向に進退しながら管端部1aの外周に沿って周方向に旋回し、回転刃39によるマンホール側壁への切削を行う。そして一周りして管端部1aの周りに該管端部1aと接する環状の空隙42を形成する。なお、ブラケット37は前述するように径方向外側部が溝34幅より細幅となっているためインバート3の存在箇所でも空隙42を支障なく形成することができる。   The cutting tool 36 is guided by the guide 12a by the operation of the operating mechanism and turns in the circumferential direction along the outer periphery of the tube end 1a while moving forward and backward in the tube axis direction, and the rotating blade 39 performs cutting on the side wall of the manhole. Then, an annular gap 42 is formed around the tube end 1a so as to be in contact with the tube end 1a. Since the bracket 37 has a radially outer portion narrower than the width of the groove 34 as described above, the gap 42 can be formed without hindrance even at the location where the invert 3 exists.

回転刃39が一周して空隙形成後、ドリル38の回転が停止し、かつ前記昇降機構により回転刃39が管軸方向に形成される溝43を通して引上げられる(図12)。
以上のようにして請求項1に係わる発明の第2工程が終了する。
After the rotary blade 39 makes a round and the gap is formed, the rotation of the drill 38 is stopped, and the rotary blade 39 is pulled up through the groove 43 formed in the tube axis direction by the lifting mechanism (FIG. 12).
As described above, the second step of the invention according to claim 1 is completed.

前述する例では、空隙42は有底状をなし、マンホール側壁の薄皮状の一部が管端部1aを支持し、形成された空隙42を確実に維持すると共に、外部から土砂が空隙内に侵入しないようにしているが、下水道管1が地盤によってしっかりと支持されて管端部1aの撓みや土砂の浸入がないか、あっても少ない、と見込まれる場合には、薄皮部分を残さないでマンホール側壁を突き切って空隙42を形成してもよい。   In the example described above, the gap 42 has a bottomed shape, and a thin skin-like part of the side wall of the manhole supports the pipe end portion 1a, and the formed gap 42 is reliably maintained, and earth and sand from the outside enter the gap. If the sewer pipe 1 is firmly supported by the ground and there is no bending of the pipe end 1a or intrusion of earth or sand, or if it is expected that there will be little, no thin skin part is left. The gap 42 may be formed by cutting through the side wall of the manhole.

上述する例ではまた、回転刃39を径方向外方に送って溝43を切り、その後、回転刃39を周方向に送って空隙42を形成するようになっているが、図13に示すように、下水道管の最上部付近で回転刃39の先端をマンホール側壁に形成される溝34の側端面に側方より当て、そのまま管軸方向に一定量押込んだのち周方向に旋回させることによっても空隙42を形成することができる。この場合もブラケット37の径方向外側部は溝34内に収まるため、マンホール2の側壁やインバート3に干渉することなく空隙形成を行うことができる。   In the example described above, the rotary blade 39 is sent radially outward to cut the groove 43, and then the rotary blade 39 is sent in the circumferential direction to form the gap 42. As shown in FIG. Next, the tip of the rotary blade 39 is applied to the side end surface of the groove 34 formed on the side wall of the manhole near the uppermost part of the sewer pipe, and is pushed in a certain amount in the pipe axis direction and then swung in the circumferential direction. Can also form voids 42. Also in this case, since the radially outer portion of the bracket 37 is accommodated in the groove 34, the gap can be formed without interfering with the side wall of the manhole 2 and the invert 3.

以上のようにして請求項2に係わる発明の第2工程を行うことができる。なお、回転刃39を管軸方向に送ることができるようにするためスライドロッド25を進退させる機構、例えばピニオンラック機構を設けるのが望ましい。   As described above, the second step of the invention according to claim 2 can be performed. It is desirable to provide a mechanism for moving the slide rod 25 back and forth, such as a pinion rack mechanism, so that the rotary blade 39 can be fed in the tube axis direction.

前述する例では、下水道管1の管端部1aの全周にわたって形成される切込溝32、溝34及び空隙42は、管軸方向にも変位した三次元的な形状をなすが、マンホール2が大径で、下水道管1が小径である場合、前述する切込溝32、溝34及び空隙42は円周方向だけで管軸方向に変位しない二次元的な形状であればよいことが多い。二次元的な形状である場合にはしたがって、回転刃27、回転刃33及び回転刃39は管軸方向に移動しないで旋回のみすればよいことになり、ガイド部材12、16は不要になる。   In the example described above, the cut groove 32, the groove 34, and the gap 42 formed over the entire circumference of the pipe end 1a of the sewer pipe 1 have a three-dimensional shape that is also displaced in the pipe axis direction. Is a large diameter and the sewer pipe 1 has a small diameter, the cut groove 32, the groove 34, and the gap 42 described above are often only required to have a two-dimensional shape that is not displaced in the pipe axis direction only in the circumferential direction. . Therefore, in the case of the two-dimensional shape, the rotary blade 27, the rotary blade 33, and the rotary blade 39 need only be turned without moving in the tube axis direction, and the guide members 12 and 16 are unnecessary.

溝34を二次元的な円周溝とする場合には、回転刃27を前述のガイド部材12又は16を用いないでレール11に沿って旋回させることにより円周方向の切込溝32を形成し、ついで前述するように管先端部1bをハツッて形成することもできるが、好ましくは図10に示す切削工具36の回転刃39に代えて、複数の円盤状のブレード45を一定間隔で備えた軸46に付け替えて行われる(図14)。   When the groove 34 is a two-dimensional circumferential groove, the circumferential cutting groove 32 is formed by turning the rotary blade 27 along the rail 11 without using the guide member 12 or 16 described above. Then, as described above, the tube tip portion 1b can be formed by being cut, but preferably a plurality of disk-shaped blades 45 are provided at regular intervals instead of the rotary blade 39 of the cutting tool 36 shown in FIG. This is done by replacing the shaft 46 (FIG. 14).

すなわちブレード45による管端部1aへの溝34の形成に際しては、先ず図14に示すように、ブレード45の切断予定箇所への位置決めを前述した回転刃27の位置決めと同様にして行い、ついでコントローラの操作によりドリル38を駆動し、かつブロック24の昇降機構を作動してブレード45を回転させながら径方向外方に送り、マンホール側 壁に支持される管端部1aに当てる。そしてそのまま押込んで管軸方向に切込みを行う。   That is, when forming the groove 34 in the pipe end 1a by the blade 45, first, as shown in FIG. 14, the blade 45 is positioned at the planned cutting position in the same manner as the positioning of the rotary blade 27 described above, and then the controller 45 The drill 38 is driven by the above operation and the lifting mechanism of the block 24 is operated to rotate the blade 45 outward while rotating the blade 45 and hit the pipe end 1a supported on the side wall of the manhole. And it pushes in as it is and cuts in a pipe axis direction.

ブレード45による切込みが管外周に達すると、コントローラからの出力により昇降機構による径方向への送りを停止すると共に、ベース旋回用の作動機構を作動させる。作動機構の作動によりベース22及びブレード45がレール11に沿って旋回し、ブレード45の旋回により管端部1aに周方向の切込みが入れられる。   When the cutting by the blade 45 reaches the outer periphery of the pipe, the feed from the elevating mechanism in the radial direction is stopped by the output from the controller, and the base turning operation mechanism is operated. The base 22 and the blade 45 are swung along the rail 11 by the operation of the operation mechanism, and the cutting of the circumferential direction is made in the pipe end portion 1a by the rotation of the blade 45.

ブレード45が一周して管端部1aに環状の切込みが複数条形成されると、ブレード45を持ち上げて切込みより離脱させる。その後、切込みにより縁切りされた切込み間の管先端部1bをハツリ作業により剥し取って図8に示すような幅広の溝34を形成する。   When the blade 45 goes around and a plurality of annular cuts are formed in the tube end 1a, the blade 45 is lifted and separated from the cut. Thereafter, the tube tip 1b between the notches cut by the notch is peeled off by a chiseling operation to form a wide groove 34 as shown in FIG.

上記方法による場合、各ブレード45により形成される複数条の切込みの合計幅は、回転刃27により形成される切込溝32の溝幅より小さいため、管端部1aへの切削量が少なくなり、動力が少なくてすむ。またブレード45を複数枚設けて同時に切込みを入れることにより、一枚のブレード45を用いて複数回切込みを入れる場合に比べ、切削時間が短くなる。
幅広の溝34が形成されたのちは前述した方法により切削刃33による幅広の深い溝34が形成され、ついで回転刃39による空隙42が形成される。
In the case of the above method, the total width of the plurality of cuts formed by each blade 45 is smaller than the groove width of the cut groove 32 formed by the rotary blade 27, so that the cutting amount to the pipe end portion 1a is reduced. , Less power. In addition, by providing a plurality of blades 45 and making incisions at the same time, cutting time is shortened as compared with the case of making incisions a plurality of times using one blade 45.
After the wide groove 34 is formed, the wide deep groove 34 is formed by the cutting blade 33 by the method described above, and then the gap 42 is formed by the rotary blade 39.

第2工程終了後、形成された空隙42にゴム又は樹脂製の緩衝材48が充填される。この際、図15に示すように管端部1aの端面とモルタル49との間にも緩衝材48を充填し、地震時の下水道管1の管軸方向への動きを若干許容できるようにしておくのが望ましい。以上により請求項1に係わる発明の第3工程が終了する。   After completion of the second step, the formed gap 42 is filled with a cushioning material 48 made of rubber or resin. At this time, as shown in FIG. 15, the buffer material 48 is also filled between the end face of the pipe end portion 1a and the mortar 49 so that the movement of the sewer pipe 1 in the pipe axis direction at the time of an earthquake can be allowed a little. It is desirable to leave. Thus, the third step of the invention according to claim 1 is completed.

図16〜図21は、請求項3に係わる発明の工法について示すもので、第1工程は次のようにして行われる。
先ず、前述する請求項1に係わる発明の第1工程と同様、下水道管管端部1aに旋回用レール11及びガイド部材12(ガイド部材16であってもよい)を取付けると共に、切削工具21を旋回用レール11に取付け、回転刃27の先端を管端面より管軸方向に一定距離離れたインバート3の切削予定箇所に合わせて位置決めする。位置決め後、ドリル28を駆動し、かつ前記昇降機構を作動して回転刃27を回転させながら径方向外方に一定速度で送り、回転刃先端を切削予定個所に当てる。そしてそのまま押込んでインバート3に径方向の穿孔を行う。
FIGS. 16-21 shows about the construction method of the invention concerning Claim 3, and a 1st process is performed as follows.
First, as in the first step of the invention according to claim 1, the turning rail 11 and the guide member 12 (which may be the guide member 16) are attached to the sewer pipe end 1a, and the cutting tool 21 is attached. The rotating blade 27 is attached to the turning rail 11, and the tip of the rotary blade 27 is positioned in accordance with the planned cutting location of the invert 3 which is separated from the tube end face by a certain distance in the tube axis direction. After positioning, the drill 28 is driven and the lifting mechanism is operated to rotate the rotary blade 27 and feed it radially outward at a constant speed, and the tip of the rotary blade is applied to the planned cutting location. And it pushes in as it is, and radial drilling is performed to the invert 3.

径方向への穿孔が下水道管管端部1aの外周付近まで達すると、方向転換して旋回し、回転刃27によるインバート3への切削を行う。
インバート3の周方向全域にわたって切込溝52を形成したのち(図16)、該切込溝52から管端面までのインバート部分3aがハツリ作業により剥がし取られ、図8に示す溝34と同一幅の溝を形成する。その後、回転刃27を切削刃33に付け替え、溝を更に深く掘り下げる。溝の掘り下げはインバート3の周方向の全域にわたって行われ、図8に示す溝34と同一幅及び同一深さ、すなわち下水道管1の外形より曲率半径の大きな深さの溝53が形成される(図17)。
When the piercing in the radial direction reaches the vicinity of the outer periphery of the sewer pipe end 1a, the direction is changed and the turn is performed, and the rotary blade 27 is cut into the invert 3.
After forming the incision groove 52 over the entire circumferential direction of the invert 3 (FIG. 16), the invert portion 3a from the incision groove 52 to the pipe end surface is peeled off by a chiseling operation and has the same width as the groove 34 shown in FIG. Forming a groove. Thereafter, the rotary blade 27 is replaced with the cutting blade 33, and the groove is dug deeper. The groove is dug down over the entire area of the invert 3 in the circumferential direction, and a groove 53 having the same width and the same depth as the groove 34 shown in FIG. 8, that is, a depth having a larger radius of curvature than the outer shape of the sewer pipe 1 is formed. FIG. 17).

以上のようにして第1工程が終了し、この間の切削は、前述の請求項1に係わる発明の第1工程において述べたと同様の方法及び手順によって行われる。
マンホールが大径であると共に、下水道管が小径で、溝53が円周方向に形成される場合には、回転刃27によるインバート3への切削は前述したと同様の理由により、回転刃27を旋回のみさせて行うことができる。
The first step is completed as described above, and the cutting during this time is performed by the same method and procedure as described in the first step of the invention according to claim 1 described above.
When the manhole has a large diameter, the sewer pipe has a small diameter, and the groove 53 is formed in the circumferential direction, the rotary blade 27 is cut into the invert 3 by the same reason as described above. It can be performed only by turning.

また図18に示すように、図14に示す切削工具36、すなわち複数の円盤状のブレード45を取付けた切削工具36を用い、ブレード45をインバート3の切断予定箇所に位置決めして切込みを行い、インバートの周方向全域に3条の切込みを行ったのち、切込み間のインバートをハツリ作業により剥ぎ取って溝53を形成してもよい。いずれの場合でもガイド部材12、16は不要になる。
なお、溝53の形成は、図19に示すように切削刃33のみを用いて行うこともでき、この場合、前述するインバート部分3aのハツリ作業が不要となる。
Further, as shown in FIG. 18, the cutting tool 36 shown in FIG. 14, that is, the cutting tool 36 to which a plurality of disk-like blades 45 are attached, is positioned and cut at the planned cutting position of the invert 3, The groove 53 may be formed by removing the invert between the cuts by a chiseling operation after three cuts are made in the entire circumferential direction of the invert. In either case, the guide members 12 and 16 are unnecessary.
The formation of the groove 53 can also be performed using only the cutting blade 33 as shown in FIG. 19, and in this case, the above-described chipping work for the invert portion 3a is not necessary.

第1工程終了後の第2工程では、スライドロッド25に空隙形成用の切削工具36が付け替えられる。ついでインバート3がない箇所に切削工具36を旋回させて管軸方向を向く回転刃39を管端面外周のマンホール側壁に当てて位置決めし、そのまま管軸方向に押込んで管端部1aに接する切込を行う。マンホール側壁に管軸方向への切込が一定量行われたのち、回転刃39を管端部1aの外周に沿って周方向に旋回させ(図20)、一周させて管端部1aの周りに管端部1aと接する環状の空隙54(図21)を形成する。   In the second step after the end of the first step, the gap forming cutting tool 36 is replaced with the slide rod 25. Next, the cutting tool 36 is turned to a place where there is no invert 3, and the rotary blade 39 facing the tube axis direction is positioned against the manhole side wall on the outer periphery of the tube end surface, and is pushed in the tube axis direction as it is to make contact with the tube end 1a. I do. After a certain amount of cut in the tube axis direction is made on the side wall of the manhole, the rotary blade 39 is swung in the circumferential direction along the outer periphery of the tube end portion 1a (FIG. 20) and is rotated around the tube end portion 1a. An annular gap 54 (FIG. 21) is formed in contact with the pipe end 1a.

上記実施形態では、空隙54を形成するため回転刃39はインバート3のない箇所で一旦、マンホール側壁に管軸方向への切込を入れているが、請求項1に係わる発明の第2工程で述べたと同様に管端部1aに径方向から切込みを入れ、管端部1aを突き切ったのち、周方向に旋回させて空隙を形成することもできる。前者の場合、管端部1aへの切込みが不要になる。   In the above embodiment, the rotary blade 39 is once cut into the manhole side wall in the tube axis direction at the place where the invert 3 is not formed in order to form the gap 54. In the second step of the invention according to claim 1, In the same manner as described above, the tube end 1a can be cut from the radial direction, cut through the tube end 1a, and then swung in the circumferential direction to form a gap. In the former case, it is not necessary to cut into the tube end 1a.

本実施形態の空隙54に関しても、図示する例では薄皮部分を残して盲孔状をなしているが、下水道管1が地盤によってしっかりと支持されて管端部1aの撓みや土砂の浸入がないか、あっても少ない、と見込まれる場合には、薄皮部分を残さないでマンホール側壁を突き切って空隙54を形成してもよい。   Regarding the gap 54 of the present embodiment as well, in the example shown in the figure, it has a blind hole shape leaving a thin skin portion, but the sewer pipe 1 is firmly supported by the ground, and there is no bending of the pipe end 1a or intrusion of earth and sand. Alternatively, if it is expected that there will be few, the gap 54 may be formed by cutting through the side wall of the manhole without leaving a thin skin portion.

第2工程終了後、形成された空隙54にゴム又は樹脂製の緩衝材56が充填される。この際、図21に示すように管端部1aの端面とインバート3の切除部分に詰められたモルタル55との間にも緩衝材56を充填し、地震時の下水道管1の管軸方向への動きを若干許容できるようにしておくのが望ましい。以上により請求項3に係わる発明の第3工程が終了する。   After completion of the second step, the formed gap 54 is filled with a cushioning material 56 made of rubber or resin. At this time, as shown in FIG. 21, the buffer material 56 is also filled between the end surface of the pipe end 1a and the mortar 55 packed in the cut portion of the invert 3, and the sewer pipe 1 in the direction of the pipe axis of the sewer pipe 1 in the event of an earthquake. It is desirable to allow some movement of Thus, the third step of the invention according to claim 3 is completed.

1・・下水道管
1a・・管端部
1b・・先端部
2・・マンホール
3・・インバート
4・・接続部
11、15・・旋回用レール
12、16・・ガイド部材
12a、18・・ガイド
12b、17・・ロッド
19・・ソリ
21、36・・切削具
22・・ベース
23・・支柱
24・・ブロック
25・・スライドロッド
26・・取付台
27、39・・回転刃
28、38・・ドリル
29、40・・ならい用ローラ
31・・切削予定個所
32、52・・切込溝
33・・切削刃
34、53・・広幅の溝
37・・ブラケット
42、54・・空隙
45・・ブレード
46・・軸
48、56・・緩衝材
49、55・・モルタル
1 ··· Sewer pipe 1a ··· Pipe end 1b · · Tip 2 · · Manhole 3 · Invert 4 · · Connection 11 and 15 · · · Rails for turning 12, 16 · · Guide members 12a and 18 · · · Guide 12b, 17 · · Rod 19 · Sliding 21, 36 · · Cutting tool 22 · Base 23 · · Column 24 · · Block 25 · · Slide rod 26 · · Mounting base 27, 39 · · Rotary blades 28, 38 ·・ Drills 29 and 40 ・ ・ Panel rollers 31 ・ ・ Scheduled portions 32 and 52 ・ ・ Cutting grooves 33 ・ ・ Cutting blades 34 and 53 ・ ・ Wide grooves 37 ・ ・ Brackets 42 and 54 ・ ・ Cavity 45 ・ ・Blade 46 ... Shaft 48, 56 ... Buffer material 49, 55 ... Mortar

Claims (5)

マンホールと下水道管との接続部分に耐震性を持たせるための工法であって、マンホール側壁にマンホールとほぼ直交して接続される下水道管のマンホール側壁に支持される管端部に対し、その内側から下水道管壁にマンホール側壁に一定深さ食い込むまでの溝を管端部の全周にわたって形成する第1工程と、クランクアームと直交して突出するクランクピンを軸状の回転刃とした形態をなす切削工具を用い、前記回転刃を管軸方向に向け、かつクランクアームを下水道管の径方向であって、第1工程において形成された環状の溝に向けた状態で、回転刃をその軸中心の回りに回転させながら、管端部の内側の前記環状溝の溝縁から径方向に押込んで切込みを入れ、回転刃が管端部を突き切ると、方向転換して管端部の周りに周方向に旋回させ、これにより管端部の周りのマンホール側壁を切削して管端部の周りに管端部と接する環状の空隙を形成する第2工程と、形成された空隙にゴムや樹脂製の緩衝材を充填する第3工程とからなることを特徴とする前記接続部分の耐震化工法。   It is a method for giving seismic resistance to the connection part between the manhole and the sewer pipe, and the inner side of the pipe end supported by the manhole side wall of the sewer pipe connected to the manhole side wall almost perpendicularly to the manhole. A first step of forming a groove from the end of the pipe to the sewer pipe wall to a certain depth into the manhole side wall over the entire circumference of the pipe end, and a crank pin projecting perpendicular to the crank arm as an axial rotary blade A cutting tool is used, and the rotary blade is oriented in the pipe axis direction, and the crank arm is oriented in the radial direction of the sewer pipe and in the annular groove formed in the first step. While rotating around the center, push in the radial direction from the groove edge of the annular groove inside the tube end to make a cut, and when the rotary blade penetrates the tube end, the direction changes and the tube ends Swirled in the circumferential direction Then, the second step of cutting the manhole side wall around the pipe end portion to form an annular gap in contact with the pipe end portion around the pipe end portion, and a rubber or resin cushioning material in the formed gap And a third step of filling, wherein the connecting portion is earthquake resistant. 第1工程における管端部の全周にわたって形成される環状の溝が管端面に達する溝であり、第2工程において使用される回転刃が管端部の内側の環状溝の溝縁から径方向に切込みを入れる代わりにマンホール側壁に形成される環状溝の溝側面から管軸方向に押込んで切込みを入れ、一定深さ切込み、切削工具のクランクアームが前記環状溝に納まったのち、方向転換して管端部の周りに周方向に旋回させ、これにより管端部の周りのマンホール側壁を切削して管端部の周りに管端部と接する環状の空隙を形成することを特徴とする請求項1記載の接続部分の耐震化工法。   An annular groove formed over the entire circumference of the tube end in the first step is a groove reaching the tube end surface, and the rotary blade used in the second step is radial from the groove edge of the annular groove inside the tube end. Instead of making a cut in the tube, the tube groove is pushed in from the side surface of the annular groove formed on the side wall of the manhole to make a cut, and a constant depth cut is made. And rotating in a circumferential direction around the pipe end, thereby cutting a manhole side wall around the pipe end to form an annular gap around the pipe end in contact with the pipe end. Item 1. Seismic retrofit method for connecting parts. 請求項1又は2に係わる発明の第1工程及び若しくは第2工程を実施する際に使用する装置であって、下水道管内に下水道管と同軸をなして取外し可能に固定され、切削工具が旋回可能に装着される旋回用レールと、該旋回用レールに固定され、切削工具に設けたならい用治具がスライド可能に係合するガイドを備えたガイド部材よりなり、前記ガイドはマンホール側壁と下水道管の歪んだ三次元形状の環状の接続部と同一形状をなし、切削工具が旋回用レールに沿って旋回する際、前記ならい用治具がガイドに案内されてスライドすることにより切削工具が管軸方向に移動しながら旋回することを特徴とする装置。 An apparatus used when carrying out the first step and / or the second step of the invention according to claim 1 or 2 , wherein the device is removably fixed coaxially with the sewer pipe in the sewer pipe, and the cutting tool can be turned. And a guide member that is fixed to the turning rail and that has a guide that is slidably engaged with a jig that is provided on the cutting tool. The guide includes a manhole side wall and a sewer pipe. When the cutting tool is swung along the swiveling rail, the cutting tool is guided by the guide and slides so that the cutting tool can move along the tube axis. A device characterized by turning while moving in a direction. 前記ガイド部材が一つの部材よりなるか、或いは複数の部材を周方向に組み合わせて形成されることを特徴とする請求項記載の装置。 The apparatus according to claim 3, wherein the guide member is formed of a single member or is formed by combining a plurality of members in the circumferential direction. 前記ガイド部材が周方向に適当間隔をおいて並べた管軸方向の多数のロッドよりなり、各ロッドはそれぞれ旋回用レールに管軸方向に位置調整可能に止着され、各一端が前記ガイドを形成することを特徴とする請求項記載の装置。
The guide member is composed of a large number of rods in the tube axis direction arranged at appropriate intervals in the circumferential direction, and each rod is fixed to the turning rail so that the position of the guide member can be adjusted in the tube axis direction, and each end is attached to the guide. 4. The apparatus of claim 3 , wherein the apparatus is formed.
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