JP5060184B2 - Connection method of branch pipe to underground main pipe and its connection structure - Google Patents
Connection method of branch pipe to underground main pipe and its connection structure Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 28
- 230000002093 peripheral effect Effects 0.000 claims description 19
- 238000002955 isolation Methods 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 10
- 239000013013 elastic material Substances 0.000 claims description 7
- 239000004927 clay Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 239000005445 natural material Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
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Description
本発明は、下水道本管等の地中本管に配水管等の支管を接続する接続工法とその接続構造に係り、地中本管と支管との接続部の免震機能を高めるようにした接続工法及び接続構造に関するものである。 The present invention relates to a connection method for connecting a branch pipe such as a distribution pipe to an underground main pipe such as a sewer main and the connection structure thereof, and has improved the seismic isolation function of the connection portion between the underground main pipe and the branch pipe. The present invention relates to a connection method and a connection structure.
従来より、地中本管に支管を接続する接続工法として、地上から地中本管に向かって推進管を建て込むと共に該推進管が地中本管に到達した状態で前記推進管内を降下させたオーガにより前記地中本管に接続孔を開口し、前記オーガの引き上げ後に前記推進管をガイドとして先端部に継手管を設けた支管を挿入すると共に該継手管と前記接続孔とを接続し、その接続部を充填材でシールする非開削による接続工法が採用されており、我々も先にこの工法についての改良技術を提案すると共にこの工法を実施している。 Conventionally, as a connection method for connecting a branch pipe to an underground main pipe, a propulsion pipe is built from the ground toward the underground main pipe, and the propulsion pipe is lowered while the propulsion pipe reaches the underground main pipe. Open a connection hole in the underground main pipe with a raised auger, and after lifting the auger, insert a branch pipe provided with a joint pipe at the tip using the propelling pipe as a guide and connect the joint pipe and the connection hole. The connection method by non-open cutting that seals the connection part with a filler is adopted, and we have proposed this improvement method and implemented this method first.
近時は地中埋設物においても免震機能を持たせることが重要課題となっているが、前記のような接続工法及び接続構造においては、通常の形態では接続部に縦方向又は横方向の免震機能を持たせることができない。 Recently, it has become an important issue to provide seismic isolation functions even for underground buried objects. However, in the connection method and connection structure as described above, in the normal form, the vertical or horizontal direction is applied to the connection part. Cannot have seismic isolation function.
従来より、管継手に免震機能を持たせる接続構造として、一般的には管継手をベローズ形にしたものや柔軟な管継手の外周にコイルスプリングを配置したものが提案されている(特許文献1〜4)が、前記のような非開削による接続工法においては、継手管に二方向へ伸縮する耐震性を持たせることは、通常の接続工法や接続構造では困難である。そこで、近時、これに適するものとして、継合する管の挿し口と後続管の受口の側面との間にコイルバネを介装し、該コイルバネの外周にカバーを設けた耐震推進工法及び管継手が提案されている(特許文献5)。
しかしながら、特許文献5に記載のものでは、継合する管と後続管の軸方向への伸縮は確保されるが、左右方向への撓みや交軸方向(水平方向)への移動については充分な免震機能を持たせることができないおそれがある。
However, in the one described in
前記のような地中本管と支管との接続構造に確実な免震機能を持たせるためには、継手管の先端部と接続孔との隙間をシールする充填材についても検討が必要であり、例えば、従来のように通常のモルタルを使用すると振動によって剥離、ひび割れ等が生じたり接続部が剪断してしまうおそれがある。 In order to provide a reliable seismic isolation function to the connection structure between the underground main pipe and the branch pipe as described above, it is necessary to study the filler that seals the gap between the tip of the joint pipe and the connection hole. For example, when a conventional mortar is used as in the prior art, there is a risk that peeling, cracking, or the like may occur due to vibration or the connection portion may be sheared.
また、充填材は、従来は接続工程において推進管が地中本管に接触したままの状態で充填しているが、推進管には作業振動等が常時加えられるおそれがあり、充填材の充填後に加振されると前記シール材の固定が阻害されるから、この点も検討する必要がある。 In addition, the filler is conventionally filled in the state where the propulsion pipe is in contact with the underground main pipe in the connection process, but there is a risk that work vibration and the like may be constantly applied to the propulsion pipe. If the vibration is applied later, the fixing of the sealing material is hindered, and this point needs to be examined.
本発明は、地中本管と支管との接続構造として、確実な免震機能を持たせることができる地中本管への支管の接続工法及び接続構造を提供することを目的とする。 An object of the present invention is to provide a connection method and a connection structure of a branch pipe to the underground main pipe that can have a reliable seismic isolation function as a connection structure between the underground main pipe and the branch pipe.
本発明は、上記課題を解決するために、地中本管への支管の接続工法においては、地上から地中本管に向かって推進管を建て込むと共に該推進管が地中本管に到達した状態で前記推進管内を降下させたオーガにより前記地中本管に接続孔を開口し、前記オーガの引き上げ後に前記推進管をガイドとして先端部に継手管を取り付けた支管を挿入すると共に該継手管の先端部と前記接続孔とを取付管本体を介して接続し、該接続部を充填材でシールする接続工法において、
前記継手管は、前記継手管は、筒状をなすと共に外周面には螺旋溝が蛇腹状に形成されていて可撓性を有する継手管本体と、前記取付管本体に接続される下部接続部材及び前記支管に接続される上部接続部材と、前記継手管本体の外周側に前記螺旋溝に嵌合させて配置されるコイルスプリング状の補強部材と、該補強部材の外周を覆うように配置されるカバー筒とで構成して前記継手管を免震継手とし、前記継手管本体はゴム等の弾性材で筒状に形成されると共に該継手管本体の下部及び上部に筒部が形成され、該筒部にそれぞれ前記下部接続部材及び上下部接続部材が挿入され、前記下部接続部材及び上下部接続部材は硬質プラスチック等で形成されると共に、それぞれの前記筒部への挿入部の外周面には抜け止めが形成され、
前記充填材は、粘土セメントを主材料とすると共にこれに通常セメント及び繊維バインダーを混合して水で混練したものであり、前記推進管を前記継手管の上端部近傍まで引き上げた状態で前記接続孔と前記取付管本体との隙間に前記充填材を充填することを特徴とする接続工法である。
In order to solve the above-mentioned problems, the present invention provides a method for connecting a branch pipe to an underground main pipe, and constructs a propulsion pipe from the ground toward the underground main pipe and the propulsion pipe reaches the underground main pipe. In this state, a connection hole is opened in the underground main pipe by the auger lowered in the propelling pipe, and after the auger is pulled up, a branch pipe with a joint pipe attached to the tip is inserted using the propelling pipe as a guide and the joint In the connection method of connecting the tip of the tube and the connection hole via the mounting tube main body, and sealing the connection portion with a filler,
The joint pipe is formed in a cylindrical shape, and a spiral groove is formed in a bellows shape on the outer peripheral surface thereof, and a flexible joint pipe main body, and a lower connecting member connected to the mounting pipe main body And an upper connecting member connected to the branch pipe, a coil spring-like reinforcing member disposed by being fitted in the spiral groove on the outer peripheral side of the joint pipe body, and an outer periphery of the reinforcing member. The joint pipe is formed as a seismic isolation joint, and the joint pipe body is formed into a cylindrical shape with an elastic material such as rubber, and a cylindrical portion is formed at the lower and upper parts of the joint pipe body, The lower connecting member and the upper and lower connecting members are inserted into the cylindrical portions, respectively, and the lower connecting member and the upper and lower connecting members are formed of hard plastic or the like, and on the outer peripheral surface of the inserting portion to the cylindrical portions. Is formed with a stopper,
The filler is made of clay cement as a main material and usually mixed with a cement and fiber binder and kneaded with water, and the connection is made in a state where the propulsion pipe is pulled up to the vicinity of the upper end of the joint pipe. The connecting method is characterized in that the filler is filled in a gap between a hole and the mounting pipe main body.
また、地中本管への支管の接続構造は、地上から地中本管に向かって推進管を建て込むと共に該推進管が地中本管に到達した状態で前記推進管内を降下させたオーガにより前記地中本管に接続孔を開口し、前記オーガの引き上げ後に前記推進管をガイドとして先端部に継手管を取り付けた支管を挿入すると共に該継手管の先端部と前記接続孔とを取付管本体を介して接続し、該接続部を充填材でシールしてなる地中本管への支管の接続構造において、
前記継手管は、筒状をなすと共に外周面には螺旋溝が蛇腹状に形成されていて可撓性を有する継手管本体と、前記取付管本体に接続される下部接続部材及び前記支管に接続される上部接続部材と、前記継手管本体の外周側に前記螺旋溝に嵌合させて配置されるコイルスプリング状の補強部材と、該補強部材の外周を覆うように配置されるカバー筒と、で構成して前記継手管が免震機能を有し、
前記継手管本体はゴム等の弾性材で筒状に形成されると共に該継手管本体の下部及び上部に筒部が形成され、該筒部にそれぞれ前記下部接続部材及び上下部接続部材が挿入され、前記下部接続部材及び上下部接続部材は硬質プラスチック等で形成されると共に、それぞれの前記筒部への挿入部の外周面には抜け止めが形成されていることを特徴とする。
The connecting structure of the branch pipe to the underground main pipe is an auger in which the propulsion pipe is built from the ground toward the underground main pipe and the propulsion pipe is lowered in the propulsion pipe in a state of reaching the underground main pipe. To open a connection hole in the underground main pipe, and after pulling up the auger, insert a branch pipe with a joint pipe attached to the tip using the propelling pipe as a guide and attach the tip of the joint pipe and the connection hole In the connection structure of the branch pipe to the underground main pipe formed by connecting through the pipe body and sealing the connection portion with a filler,
The joint pipe has a cylindrical shape, and a spiral groove is formed in an outer peripheral surface in a bellows shape, and has a flexible joint pipe main body, a lower connection member connected to the mounting pipe main body, and a connection to the branch pipe An upper connecting member, a coil spring-like reinforcing member arranged by being fitted to the spiral groove on the outer peripheral side of the joint pipe main body, a cover tube arranged to cover the outer periphery of the reinforcing member, the joint tube have a seismic isolation function in configuration to,
The joint pipe body is formed in a cylindrical shape with an elastic material such as rubber, and cylindrical parts are formed at the lower and upper parts of the joint pipe body, and the lower connection member and the upper and lower connection members are inserted into the cylinder parts, respectively. the lower connecting member and the upper and lower connecting members together is formed of a hard plastic or the like, on the outer peripheral surface of the insertion portion into each of the tubular portion, characterized that you have been retaining formation.
前記継手管本体の前記筒部の外周面と、前記螺旋溝の外面と、前記補強部材の外面と、が略同一の円周面内に位置し、これらの筒部、螺旋溝及び補強部材の外面を覆ってカバー筒が外挿されていることが望ましく、また、継手管本体の本体部に対し、筒状ソケットからなる前記下部接続部材及び上部接続部材がそれぞれ挿入されると共に本体部の外周面から締付バンドで締め付け固定するのが好ましい。 The outer peripheral surface of the cylindrical portion of the joint pipe main body, the outer surface of the spiral groove, and the outer surface of the reinforcing member are positioned within substantially the same circumferential surface, and the cylindrical portion, the spiral groove, and the reinforcing member It is desirable that a cover cylinder is inserted so as to cover the outer surface, and the lower connecting member and the upper connecting member made of a cylindrical socket are respectively inserted into the main body portion of the joint pipe main body and the outer periphery of the main body portion. It is preferable to fasten and fix from the surface with a fastening band.
本発明の地中本管への支管の接続工法及び接続構造によれば、継手管は、筒状をなすと共に外周面には螺旋溝が蛇腹状に形成されていて可撓性を有する継手管本体と、前記取付管本体に接続される下部接続部材及び前記支管に接続される上部接続部材と、前記継手管本体の外周側に前記螺旋溝に嵌合させて配置されるコイルスプリング状の補強部材と、該補強部材の外周を覆うように配置されるカバー筒と、で構成して三層構造となっているから、継手管の軸方向への伸縮はもちろん、左右方向への撓みや水平方向への移動を確実に吸収することができる。 According to the connecting method and the connecting structure of the branch pipe to the underground main pipe of the present invention, the joint pipe has a cylindrical shape, and a spiral groove is formed on the outer peripheral surface in a bellows shape, so that the joint pipe has flexibility. A main body, a lower connecting member connected to the mounting pipe main body, an upper connecting member connected to the branch pipe, and a coil spring-like reinforcement disposed on the outer peripheral side of the joint pipe main body so as to be fitted into the spiral groove Since it is composed of a member and a cover cylinder arranged so as to cover the outer periphery of the reinforcing member, it has a three-layer structure. The movement in the direction can be reliably absorbed.
前記接続工法に使用する充填材は、粘土セメントを主材料とし、これに通常セメント及び繊維バインダーを混合して水で混練したものであるから、柔軟性があり、シール部にシワ、亀裂等が発生することはなく、また、液状化しないと共に有害物質を含まない天然資材であるから、地下水を汚染するおそれはないし、充填に際しては通常の圧入機で施工することができる。しかも、この充填材の充填は前記推進管を前記継手管の上端部近傍まで引き上げた状態で行われるから、推進管の振動がシール部に影響を与えることはなく、シワ、ひび割れ等は発生しない。 The filler used in the connection method is mainly made of clay cement, usually mixed with cement and fiber binder, and kneaded with water, so it has flexibility, wrinkles, cracks, etc. in the seal part. It does not occur and is a natural material that does not liquefy and does not contain harmful substances, so there is no risk of contaminating groundwater, and filling can be done with a normal press-fitting machine. Moreover, since the filling of the filler is performed in a state where the propulsion pipe is pulled up to the vicinity of the upper end of the joint pipe, the vibration of the propulsion pipe does not affect the seal portion, and wrinkles, cracks, etc. do not occur. .
図面は本発明に係る地中本管11への支管12の接続工法及びその接続構造1の実施例を示し、図1は前記支管12を継手管2を介して前記地中本管11に接続した状態を示す正面図、図2は継手管2の構成を示す一部断面正面図、図3は同じく継手管2の構成部材を示す分解図であり、各部材は一部を断面して示している。
The drawings show an embodiment of the method of connecting the
前記地中本管11と支管12との接続は非開削工法で行われるものであり、周知の工法によって、地上から地中本管11に向かって推進管(図示しない)を建て込むと共に該推進管が地中本管11に到達した状態で推進管内を降下させたオーガ(図示しない)で前記地中本管11に接続孔11aを開口し、前記オーガを引き上げた後に、先端部に継手管2を取り付けた支管12を前記推進管をガイドとして挿入すると共に該継手管2の先端部を取付管本体3を介して前記接続孔11aに接続し、該接続部を後に説明する充填材13でシールする接続工法と接続構造である。
The underground main pipe 11 and the
前記のような推進管を使用する非開削工法自体及び継手管先端部と地中本管11の接続孔11aとの接続工法については本出願人も提案し(特開平6-65958号公報及び特開2000−282557号公報)現実に実施しており、従来の工法及びその部材等はそのまま使用することができる。 The present applicant also proposed the non-cutting method using the propulsion pipe as described above and the connection method between the joint pipe tip and the connection hole 11a of the underground main pipe 11 (Japanese Patent Laid-Open No. 6-65958 and No. 2000-282557) In practice, the conventional method and its members can be used as they are.
前記接続構造1は、前記継手管2と取付管本体3とからなり、取付管本体3は前記接続穴11aに挿入されて該接続孔11aとの隙間が充填材13でシールされる構造である。前記前記継手管2は、ゴム等の弾性材で形成されていて外周面に螺旋溝4aが蛇腹状に形成されている継手管本体4と、その下部に配置され前記取付管本体3に接続される下部接続部材5及び上部に配置され前記前記支管12に接続される上部接続部材6と、前記螺旋溝4aに嵌合させて配置されるコイルスプリング状の補強部材7と、該補強部材7の外周を覆うように配置されるゴム等の弾性材からなるカバー筒8と、で構成して前記継手管2が免震機能を有するように構成したものである。
The connection structure 1 is composed of the
具体的には、前記継手管本体4はゴム等の弾性材で筒状に形成されると共に下部及び上部に筒部4b、4cが形成される。該筒部4b、4cにそれぞれ挿入される下部接続部材5及び上下部接続部材6は硬質プラスチック等で形成されていて、両接続部材のそれぞれの挿入部の外周面には抜け止めギザ(又は溝)5a、6aが形成されている。なお、前記上部接続部材6の上部は、図2、図3に示すように、内側面に突き当てリブ9aを有する連結管9に挿入され、該連結管9を介して前記支管12が連結されるようになっている。
Specifically, the joint pipe body 4 is formed in a cylindrical shape with an elastic material such as rubber, and the
前記抜け止めギザ5a,6aに対応する位置の前記筒部4b、4cは外周からそれぞれ二重の締付バンド10、10で締付固定され、抜け止めがより確実なものとなっている。
The
前記取付管本体3を前記取付孔11aに取り付ける接続取付手段は、本出願人が先に提案した特開2000−282557号公報に記載の手段をそのまま採用することができる。例えば、図4に示すように、前記取付管本体3を熱可塑性プラスチックで内外二重筒3a、3bで形成すると共に外筒3aの先端部に形成したフランジ13を地中本管11の表面に当接するようにし、一方、内筒3bの先端は前記取付孔11aに挿入し、この状態で前記推進管内を降下させた温風ヒータ(図示しない)で前記内筒3bの先端部を軟化させ、次に先端部に風船体を取り付けた膨張装置(図示しない)を該風船体を萎ませた状態で推進管から降下し、空気を圧送することにより前記風船体を膨張させて軟化している前記内筒3bの先端部を外方向に押し拡げることにより挟持用フランジ14を形成し、該挟持用フランジ14と前記フランジ13とで地中本管11の肉厚を挟持するようにして取り付けると共に前記フランジ13及び挟持用フランジ14と取付孔11aとの隙間をでシールする方法である。
As connection attachment means for attaching the attachment tube
前記は、公知の粘土セメントを主材料とし、これに通常セメントとこれも公知の繊維バインダーを混合して水で混練したものであり、粘土セメントと繊維バインダーの使用によりシール部に粘性を持たせることができると共にひび割れ等がなく、また、液状化のおそれはないと共に粘土セメントは有害物質を含まない天然資材であるから地下水の汚染等の環境汚染のおそれはない。施工に際しては通常の圧入機で充填することができる。 In the above, a known clay cement is used as a main material, and a normal cement and a known fiber binder are mixed and kneaded with water, and the seal portion is made viscous by using the clay cement and the fiber binder. In addition, there is no risk of cracking and the like, and there is no risk of liquefaction, and since clay cement is a natural material that does not contain harmful substances, there is no risk of environmental pollution such as contamination of groundwater. At the time of construction, it can be filled with a normal press-fitting machine.
従来は前記の充填は前記推進管が地中本管11に接触した状態で行われていたが、接続構造1を前記のような免震構造とすることにより、推進管を継手管の免震機能を阻害しない位置、すなわち、継手管の上端部近傍まで引き上げた状態でを充填するようにする。これにより免震継手管に無用の加圧をかけたりが継手管の可撓を妨げたりすることなく施工することができる。 Conventionally, the filling has been performed in a state where the propulsion pipe is in contact with the underground main pipe 11. However, by making the connection structure 1 the seismic isolation structure as described above, the propulsion pipe is isolated from the joint pipe. In a state where the function is not hindered, that is, in a state where it is pulled up to the vicinity of the upper end of the joint pipe, it is filled. Thereby, construction can be performed without applying unnecessary pressure to the seismic isolation joint pipe or hindering the flexibility of the joint pipe.
図5は以上のような接続工法及び接続構造で地中本管に支管を接続した場合の継手管の免震機能を説明する正面図であり、(A)は地中本管11と支管12とが上下方向に相対移動(伸縮)した状態を示し、(B)は支管12が傾倒するような移動が生じた状態を示し、(C)は横ずれが生じた状態を示している。
FIG. 5 is a front view for explaining the seismic isolation function of the joint pipe when the branch pipe is connected to the underground main pipe by the connection method and the connection structure as described above, and (A) is the underground main pipe 11 and the
1 接続構造
2 継手管
3 取付管本体
4 継手管本体
5 下部接続部材
6 上部接続部材
7 補強部材
8 カバー筒
9 連結管
10 締付バンド
11 地中本管
12 支管
13 フランジ
14 挟持用フランジ
2 充填材
DESCRIPTION OF SYMBOLS 1
Claims (4)
前記継手管は、筒状をなすと共に外周面には螺旋溝が蛇腹状に形成されていて可撓性を有する継手管本体と、前記取付管本体に接続される下部接続部材及び前記支管に接続される上部接続部材と、前記継手管本体の外周側に前記螺旋溝に嵌合させて配置されるコイルスプリング状の補強部材と、該補強部材の外周を覆うように配置されるカバー筒とで構成して前記継手管を免震継手とし、前記継手管本体はゴム等の弾性材で筒状に形成されると共に該継手管本体の下部及び上部に筒部が形成され、該筒部にそれぞれ前記下部接続部材及び上下部接続部材が挿入され、前記下部接続部材及び上下部接続部材は硬質プラスチック等で形成されると共に、それぞれの前記筒部への挿入部の外周面には抜け止めが形成され、
前記充填材は、粘土セメントを主材料とすると共にこれに通常セメント及び繊維バインダーを混合して水で混練したものであり、
前記推進管を前記継手管の上端部近傍まで引き上げた状態で前記接続孔と前記取付管本体との隙間に前記充填材を充填することを特徴とする接続工法。 A propulsion pipe is built from the ground toward the underground main pipe and a connection hole is opened in the underground main pipe by an auger lowered in the propulsion pipe in a state where the propulsion pipe reaches the underground main pipe, After the auger is pulled up, a branch pipe with a joint pipe attached to the tip using the propulsion pipe as a guide is inserted, and the tip of the joint pipe and the connection hole are connected via a mounting pipe main body, and the connection is filled with a filler. In the connection method of the branch pipe to the underground main pipe sealed with
The joint pipe has a cylindrical shape, and a spiral groove is formed in an outer peripheral surface in a bellows shape, and has a flexible joint pipe main body, a lower connection member connected to the mounting pipe main body, and a connection to the branch pipe An upper connecting member, a coil spring-like reinforcing member arranged to be fitted in the spiral groove on the outer peripheral side of the joint pipe body, and a cover cylinder arranged to cover the outer periphery of the reinforcing member The joint pipe is configured as a seismic isolation joint, and the joint pipe main body is formed into a cylindrical shape with an elastic material such as rubber, and a cylindrical portion is formed at the lower and upper parts of the joint pipe main body. The lower connecting member and the upper and lower connecting members are inserted, and the lower connecting member and the upper and lower connecting members are formed of hard plastic or the like, and a stopper is formed on the outer peripheral surface of the inserting portion to each of the cylindrical portions. And
The filler is made of clay cement as a main material and usually mixed with cement and fiber binder and kneaded with water.
A connecting method characterized in that the filler is filled in a gap between the connection hole and the mounting pipe main body in a state where the propulsion pipe is pulled up to the vicinity of the upper end of the joint pipe.
前記継手管は、筒状をなすと共に外周面には螺旋溝が蛇腹状に形成されていて可撓性を有する継手管本体と、前記取付管本体に接続される下部接続部材及び前記支管に接続される上部接続部材と、前記継手管本体の外周側に前記螺旋溝に嵌合させて配置されるコイルスプリング状の補強部材と、該補強部材の外周を覆うように配置されるカバー筒と、で構成して前記継手管が免震機能を有し、
前記継手管本体はゴム等の弾性材で筒状に形成されると共に該継手管本体の下部及び上部に筒部が形成され、該筒部にそれぞれ前記下部接続部材及び上下部接続部材が挿入され、前記下部接続部材及び上下部接続部材は硬質プラスチック等で形成されると共に、それぞれの前記筒部への挿入部の外周面には抜け止めが形成されていることを特徴とする接続構造。 A propulsion pipe is built from the ground toward the underground main pipe and a connection hole is opened in the underground main pipe by an auger lowered in the propulsion pipe in a state where the propulsion pipe reaches the underground main pipe, After the auger is pulled up, a branch pipe with a joint pipe attached to the tip using the propulsion pipe as a guide is inserted, and the tip of the joint pipe and the connection hole are connected via a mounting pipe main body, and the connection is filled with a filler. In the connection structure of the branch pipe to the underground main pipe sealed with
The joint pipe has a cylindrical shape, and a spiral groove is formed in an outer peripheral surface in a bellows shape, and has a flexible joint pipe main body, a lower connection member connected to the mounting pipe main body, and a connection to the branch pipe An upper connecting member, a coil spring-like reinforcing member arranged by being fitted to the spiral groove on the outer peripheral side of the joint pipe main body, a cover tube arranged to cover the outer periphery of the reinforcing member, the joint tube have a seismic isolation function in configuration to,
The joint pipe body is formed in a cylindrical shape with an elastic material such as rubber, and cylindrical parts are formed at the lower and upper parts of the joint pipe body, and the lower connection member and the upper and lower connection members are inserted into the cylinder parts, respectively. connection structure wherein the lower connecting member and the upper and lower connecting members together is formed of a hard plastic or the like, on the outer peripheral surface of the insertion portion into the respective said tubular portions, characterized that you have been retaining formation.
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