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 PDF

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JP5060184B2
JP5060184B2 JP2007167351A JP2007167351A JP5060184B2 JP 5060184 B2 JP5060184 B2 JP 5060184B2 JP 2007167351 A JP2007167351 A JP 2007167351A JP 2007167351 A JP2007167351 A JP 2007167351A JP 5060184 B2 JP5060184 B2 JP 5060184B2
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榮治 今井
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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)。
実開昭５８-１９１８５号公報 実開昭６１-９７６８０号公報 特開昭６１-２３６９９０号公報 特開平１０-６１８５０号公報 特開２０００−２６６２６０号公報 Conventionally, as a connection structure for giving a pipe joint a seismic isolation function, a pipe joint with a bellows shape and a coil spring arranged on the outer periphery of a flexible pipe joint have been proposed (Patent Documents). 1-4) In the connection method by non-cutting as described above, it is difficult to provide the joint pipe with the earthquake resistance that expands and contracts in two directions by a normal connection method or connection structure. Therefore, recently, as suitable for this, a seismic propulsion method and pipe in which a coil spring is interposed between the insertion port of the pipe to be joined and the side of the receiving port of the succeeding pipe and a cover is provided on the outer periphery of the coil spring. A joint has been proposed (Patent Document 5).
Japanese Utility Model Publication No. 58-19185 Japanese Utility Model Publication No. 61-97680 JP-A 61-236990 Japanese Patent Laid-Open No. 10-61850 JP 2000-266260 A

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 Patent Document 5, expansion and contraction in the axial direction of the pipe to be joined and the subsequent pipe is ensured, but sufficient for bending in the left-right direction and movement in the cross-axis direction (horizontal direction). There is a possibility that the seismic isolation function cannot be provided.

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 branch pipe 12 to the underground main pipe 11 according to the present invention and the connection structure 1 thereof. FIG. 1 shows the connection of the branch pipe 12 to the underground main pipe 11 through the joint pipe 2. FIG. 2 is a partially sectional front view showing the configuration of the joint pipe 2, and FIG. 3 is an exploded view showing the constituent members of the joint pipe 2 as well. FIG. ing.

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 branch pipe 12 are connected by a non-cutting method, and a propulsion pipe (not shown) is built from the ground toward the underground main pipe 11 by a well-known method and the propulsion is performed. A connecting hole 11a is opened in the underground main pipe 11 with an auger (not shown) lowered in the propelling pipe in a state where the pipe has reached the underground main pipe 11, and after the auger is pulled up, a joint pipe is attached to the tip portion. 2 is inserted using the propulsion pipe as a guide, and the tip of the joint pipe 2 is connected to the connection hole 11a via the attachment pipe body 3, and the connection portion is filled with a filler 13 to be described later. It is a connection method and a connection structure for sealing.

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 joint pipe 2 and the attachment pipe main body 3, and the attachment pipe main body 3 is inserted into the connection hole 11 a and the gap with the connection hole 11 a is sealed with the filler 13. . The joint pipe 2 is formed of an elastic material such as rubber, and has a joint pipe body 4 in which a spiral groove 4a is formed in an accordion shape on an outer peripheral surface, and is disposed below the joint pipe body 4 and connected to the mounting pipe body 3. The lower connecting member 5 and the upper connecting member 6 arranged on the upper part and connected to the branch pipe 12, the coil spring-like reinforcing member 7 arranged to be fitted to the spiral groove 4a, and the reinforcing member 7 And a cover cylinder 8 made of an elastic material such as rubber arranged so as to cover the outer periphery, so that the joint pipe 2 has a seismic isolation function.

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 cylindrical portions 4b and 4c are formed in the lower portion and the upper portion. The lower connecting member 5 and the upper and lower connecting members 6 to be inserted into the cylindrical portions 4b and 4c are formed of hard plastic or the like, and a retaining jaw (or groove) is formed on the outer peripheral surface of each of the connecting portions of both connecting members. ) 5a and 6a are formed. As shown in FIGS. 2 and 3, the upper portion of the upper connecting member 6 is inserted into a connecting pipe 9 having an abutment rib 9 a on the inner surface, and the branch pipe 12 is connected through the connecting pipe 9. It has become so.

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 cylindrical portions 4b and 4c at positions corresponding to the retaining jaws 5a and 6a are fastened and fixed from the outer periphery by double fastening bands 10 and 10, respectively, so that the retaining is more reliable.

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 main body 3 to the attachment hole 11a, the means described in Japanese Patent Application Laid-Open No. 2000-282557 previously proposed by the present applicant can be employed as it is. For example, as shown in FIG. 4, the mounting pipe main body 3 is formed of thermoplastic inner and outer double cylinders 3a and 3b and a flange 13 formed at the tip of the outer cylinder 3a is formed on the surface of the underground main pipe 11. On the other hand, the tip of the inner cylinder 3b is inserted into the mounting hole 11a, and the tip of the inner cylinder 3b is softened with a warm air heater (not shown) lowered in the propelling pipe in this state, Next, an expansion device (not shown) with a balloon body attached to the tip is lowered from the propelling tube in a state where the balloon body is deflated, and the balloon body is inflated and softened by pumping air. A clamping flange 14 is formed by expanding the distal end portion of the inner cylinder 3b outward, and the clamping flange 14 and the flange 13 are attached so that the thickness of the underground main pipe 11 is clamped. Flange 13 and clamping In this method, the gap between the working flange 14 and the mounting hole 11a is sealed.

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 branch pipe 12. Indicates a state of relative movement (stretching) in the vertical direction, (B) indicates a state in which the branch pipe 12 is tilted, and (C) indicates a state in which a lateral shift has occurred.

支管を継手管を介して地中本管に接続した状態を示す正面図である。It is a front view which shows the state which connected the branch pipe to the underground main pipe through the joint pipe. 継手管の構成を示す一部断面正面図である。It is a partial cross section front view which shows the structure of a joint pipe. 継手管の構成部材を示す分解図である。It is an exploded view which shows the structural member of a joint pipe. 地中本管への取付管本体の取付構造を示す要部の断面図である。It is sectional drawing of the principal part which shows the attachment structure of the attachment pipe main body to an underground main pipe. 継手管の免震機能を説明する正面図であり、（Ａ）は地中本管と支管とが上下方向に相対移動（伸縮）した状態を示し、（Ｂ）は支管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。It is a front view explaining the seismic isolation function of a joint pipe, (A) shows the state where the underground main pipe and the branch pipe are relatively moved (stretched) in the vertical direction, and (B) is a movement that tilts the branch pipe. (C) shows a state in which a lateral shift has occurred.

符号の説明Explanation of symbols

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 Connection structure 2 Joint pipe 3 Mounting pipe main body 4 Joint pipe main body 5 Lower connection member 6 Upper connection member 7 Reinforcement member 8 Cover cylinder 9 Connection pipe 10 Tightening band 11 Underground pipe 12 Branch pipe 13 Flange 14 Clamping flange 2 Filling Material

Claims (4)

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地中本管への支管の接続工法において、
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. 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. 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を特徴とする請求項２に記載された接続構造。 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 The connection structure according to claim 2, wherein a cover tube is extrapolated so as to cover an outer surface . 継手管本体に対し、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外周面から締付バンドで締め付け固定されていることを特徴とする請求項２又は請求項３のいずれか１項に記載された接続構造。   4. The joint pipe main body according to claim 2, wherein the lower connection member and the upper connection member are respectively inserted and fastened and fixed with a fastening band from an outer peripheral surface. The described connection structure.
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