JP6715097B2 - Connection structure of underground pipe - Google Patents

Connection structure of underground pipe Download PDF

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JP6715097B2
JP6715097B2 JP2016120652A JP2016120652A JP6715097B2 JP 6715097 B2 JP6715097 B2 JP 6715097B2 JP 2016120652 A JP2016120652 A JP 2016120652A JP 2016120652 A JP2016120652 A JP 2016120652A JP 6715097 B2 JP6715097 B2 JP 6715097B2
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flange
buried pipe
pipe
underground buried
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JP2017225298A (en
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佑一 藤本
佑一 藤本
哲哉 稲掛
哲哉 稲掛
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Tigers Polymer Corp
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Description

本発明は、地中埋設管の接続構造に関する。特に、螺旋波付可撓管からなる地中埋設管を、ハンドホールなどの壁面に設けられた配管用貫通孔に接続する構造に関する。 The present invention relates to a connection structure for underground pipes. In particular, the present invention relates to a structure for connecting an underground buried pipe made of a flexible pipe with a spiral wave to a pipe through hole provided on a wall surface such as a handhole.

従来、地中埋設管をハンドホールなどの壁面に固定するには、ハンドホールなどの壁面に穿設した配管用貫通孔に地中埋設管の先端を挿通後、配管用貫通孔の内側より地中埋設管の先端部にベルマウスと称されるラッパ型の開口部を有する管状部材を地中埋設管の管体の螺旋形状を利用して螺入するとともに、接着材で地中埋設管を配管用貫通孔に固定していた。また、特許文献１や特許文献２には、地中埋設管のハンドホールへの接続構造として、地中埋設管の内側に螺着するベルマウス部材と、地中埋設管の外側に螺着するホルダー（締付部材）により、ハンドホール壁を挟持して地中埋設管をハンドホールの配管用貫通孔に固定する接続構造が開示されている。 Conventionally, in order to fix the underground buried pipe to the wall surface of the handhole, etc., after inserting the tip of the underground buried pipe into the through hole for piping drilled in the wall surface of the handhole, etc., from the inside of the through hole for piping A tubular member having a trumpet-shaped opening called a bell mouth is screwed into the tip of the underground buried pipe by using the spiral shape of the pipe body of the underground buried pipe, and the underground buried pipe is fixed with an adhesive. It was fixed in the through hole for piping. Further, in Patent Document 1 and Patent Document 2, as a connection structure of the underground buried pipe to the handhole, a bell mouth member screwed to the inside of the underground buried pipe and to the outside of the underground buried pipe. A connection structure is disclosed in which a holder (tightening member) holds a wall of a handhole and fixes an underground pipe to a through hole for piping of the handhole.

特開平１１−２６６５１９号公報Japanese Patent Laid-Open No. 11-266519 特開２００９−１３０９９５号公報JP, 2009-130995, A

特許文献１や特許文献２の地中埋設管の接続構造においては、ハンドホール内部に水が浸入しないように、ハンドホール壁面とホルダー（締付部材）との間にシール部材を挟み込んで、当該部位をシールする必要がある。 In the underground buried pipe connection structures of Patent Document 1 and Patent Document 2, a sealing member is sandwiched between the wall surface of the handhole and the holder (tightening member) so that water does not enter the inside of the handhole. The site needs to be sealed.

しかしながら、特許文献１や特許文献２の地中埋設管の接続構造においては、ホルダーを管の中心軸回りに回転させながら、ハンドホール壁面に向かって前進させ、ホルダーとベルマウスでハンドホールの壁を挟み込んで接続構造を完成させる必要があるが、シールが確実になされるように、この締め込み作業を行うのはなかなか難しい。 However, in the underground buried pipe connection structure of Patent Document 1 or Patent Document 2, while the holder is rotated around the central axis of the pipe, it is advanced toward the wall surface of the handhole, and the wall of the handhole is held by the holder and the bell mouth. Although it is necessary to sandwich the pin to complete the connection structure, it is difficult to perform this tightening work so that the seal can be reliably made.

すなわち、特許文献１や特許文献２の地中埋設管の接続構造においては、接続操作の際に、相対回転するハンドホール壁面とホルダーの間にシール部材が設けられているため、シール部材とハンドホール壁面の間で強い摩擦が発生して、ホルダー十分に締めこむことができなくなったり、シール部材がめくれてしまったりすることがある。いずれの場合にも、当該部位におけるシール性が不十分となるおそれがある。ハンドホール壁面が平滑な平面状に仕上げられていない場合や、ハンドホール壁面と地中埋設管とが互いに少し傾いて取り付けられるような場合には、こうしたシール不具合発生のおそれが、より高まる。 That is, in the connection structure of the underground buried pipe of Patent Document 1 or Patent Document 2, since the seal member is provided between the relative rotating handhole wall surface and the holder during the connection operation, the seal member and the hand There is a case where strong friction occurs between the wall surfaces of the holes, which makes it impossible to sufficiently tighten the holder or the sealing member may be turned up. In any case, there is a possibility that the sealing property at the site may be insufficient. If the wall surface of the handhole is not finished to be a smooth flat surface, or if the wall surface of the handhole and the underground buried pipe are attached at a slight inclination with respect to each other, the possibility of occurrence of such a seal defect is further increased.

本発明の目的は、締め込み操作がしやすく、壁面と締付部材との間のシール性がより確実になるような地中埋設管の接続構造を提供することにある。
An object of the present invention is to provide a connection structure for an underground buried pipe that facilitates tightening operation and ensures more reliable sealing between the wall surface and the tightening member.

発明者は、鋭意検討の結果、締付部材を、フランジ部材とネジ部材とを有するように分割して構成し、フランジ部材とネジ部材とが地中埋設管の中心軸回りに相対回転可能にされていると、上記課題を解決できることを知見し、本発明を完成させた。 The inventor, as a result of diligent studies, configured the fastening member by dividing it so as to have a flange member and a screw member, and the flange member and the screw member were capable of relative rotation about the central axis of the underground buried pipe. It was found that the above problems can be solved by doing so, and completed the present invention.

本発明は、ハンドホールなどの壁面に設けられた配管用貫通孔に、螺旋波付可撓管からなる地中埋設管を、地中埋設管の外側に螺合される締付部材と地中埋設管の先端に螺着したベルマウスとで固定する接続構造であって、前記締付部材は、フランジ部材とネジ部材とを有しており、フランジ部材は、前記壁面に向かって押圧されるフランジ部と、フランジ部に設けられたリング状の第１シール部材とを一端部に有し、ネジ部材は少なくともその内面が地中埋設管の螺旋波形に対応する螺合部を有し、フランジ部材とネジ部材とは、地中埋設管の中心軸回りに相対回転可能にされつつ、フランジ部材とネジ部材はネジ構造で接続されておらず、フランジ部材の地中埋設管中央側の末端部が、ネジ部材に対し、地中埋設管の中心軸に沿う方向に当接することにより、フランジ部材が地中埋設管の中央側に向かって変位することをネジ部材が規制している地中埋設管の接続構造である（第１発明）。 The present invention relates to a grounding pipe made of a flexible pipe with a spiral wave in a pipe through hole provided in a wall surface such as a handhole, and a fastening member screwed to the outside of the grounding pipe and a grounding pipe. A connection structure for fixing with a bell mouth screwed to a tip of an embedded pipe, wherein the tightening member has a flange member and a screw member, and the flange member is pressed toward the wall surface. A flange portion and a ring-shaped first seal member provided on the flange portion are provided at one end portion, and the screw member has at least an inner surface thereof with a threaded portion corresponding to the spiral waveform of the underground buried pipe. The member and the screw member are relatively rotatable around the central axis of the underground buried pipe, but the flange member and the screw member are not connected by a screw structure, and the end portion of the flange member on the central side of the underground buried pipe is not connected. , The screw member restricts the flange member from displacing toward the center side of the underground buried pipe by contacting the screw member in the direction along the central axis of the underground buried pipe. It is a pipe connection structure (first invention).

第１発明においては、フランジ部材には筒状の第１筒部が設けられると共に、ネジ部材には筒状の第２筒部が設けられ、第１筒部と第２筒部の一方が他方の内側に入りこむようにされて、第１筒部と第２筒部の間には、半径方向に挟まれるように第２シール部材が設けられていることが好ましい（第２発明）。また、第２発明においては、第２シール部材が吸水膨張性不織布を含むことが好ましい（第３発明）。 In the first invention, the flange member is provided with the tubular first tubular portion, the screw member is provided with the tubular second tubular portion, and one of the first tubular portion and the second tubular portion is the other. It is preferable that a second seal member is provided between the first cylinder portion and the second cylinder portion such that the second seal member is inserted inwardly of the first cylinder portion and the second cylinder portion ( second invention). Further, in the second invention, it is preferable that the second seal member contains a water-absorptive non-woven fabric ( third invention).

本発明の地中埋設管の接続構造（第１発明）によれば、接続操作の際の締め込み操作がしやすく、壁面と締付部材との間のシール性がより確実になる。 According to the underground buried pipe connecting structure (first invention) of the present invention, the tightening operation at the time of the connecting operation is facilitated, and the sealing property between the wall surface and the tightening member becomes more reliable.

さらに、第１発明によれば、ネジ部材による締め込み力を確実にフランジ部材に伝達でき、第１シール部材のシール性がより確実になる。また、第２発明や第３発明のようにすれば、第２シール部材の摩擦によってフランジ部材とネジ部材が相対回転しにくくなることが抑制され、締め込み操作がしやすくなる。 Further, according to the first aspect , the tightening force of the screw member can be reliably transmitted to the flange member, and the sealing property of the first seal member becomes more reliable. Further, according to the second invention and the third invention, it is suppressed that the flange member and the screw member are less likely to rotate relative to each other due to the friction of the second seal member, and the tightening operation is facilitated.

第１実施形態の地中埋設管の接続構造を示す一部断面図である。It is a partial cross section figure which shows the connection structure of the underground pipe of 1st Embodiment. 第１実施形態の地中埋設管の接続構造に用いられる締付部材の構造を示す一部断面図である。It is a partial cross section figure which shows the structure of the fastening member used for the connection structure of the underground buried pipe of 1st Embodiment. 第１実施形態の地中埋設管の接続操作の過程を示す一部断面図である。It is a partial cross section figure which shows the process of the connection operation of the underground buried pipe of 1st Embodiment. 第２実施形態の地中埋設管の接続構造に用いられる締付部材の構造を示す一部断面図である。It is a partial cross section figure which shows the structure of the fastening member used for the connection structure of the underground buried pipe of 2nd Embodiment. 第３実施形態の地中埋設管の接続構造に用いられる締付部材の構造を示す一部断面図である。It is a partial cross section figure which shows the structure of the fastening member used for the connection structure of the underground buried pipe of 3rd Embodiment.

以下図面を参照しながら、地中埋設管がハンドホールの壁面に接続される際の発明の実施形態について説明する。発明は以下に示す個別の実施形態に限定されるものではなく、その形態を変更して実施することもできる。地中埋設管の接続対象は、ハンドホールに限定されず、マンホールや情報ボックス等であってもよい。地中埋設管は、内部に電線や光ファイバなどのケーブルが通される管路とされることが多いが、具体的用途はこれら通信用途や通電用途に限定されない。 Hereinafter, an embodiment of the invention when an underground buried pipe is connected to a wall surface of a handhole will be described with reference to the drawings. The invention is not limited to the individual embodiments described below, and the modes can be modified and implemented. The connection target of the underground buried pipe is not limited to the handhole, and may be a manhole, an information box or the like. The underground buried pipe is often used as a conduit through which a cable such as an electric wire or an optical fiber is inserted, but its specific use is not limited to these communication use and electricity supply use.

図１は、第１実施形態の地中埋設管の接続構造を示す一部断面図であり、図２は、接続に用いられる締付部材１である。これらの図では、各部材の記載を、中心軸ｍの上側を断面図で、下側では外観図で示している。なお、地中埋設管３については、管全体を主に外観図で示し、先端部のみを一部断面で示している。 FIG. 1 is a partial cross-sectional view showing a connection structure of an underground buried pipe according to the first embodiment, and FIG. 2 is a fastening member 1 used for connection. In these drawings, the description of each member is shown in a sectional view on the upper side of the central axis m and in an external view on the lower side. Regarding the underground buried pipe 3, the entire pipe is mainly shown in an external view, and only the tip portion is shown in a partial cross section.

地中埋設管３は、ハンドホールの壁４に設けられた配管用貫通孔４ｂに挿通され、地中埋設管３の外側に螺着される締付部材１と、地中埋設管３の先端部内側に螺着されるベルマウス２とが壁４を挟持することによって、ハンドホールに接続固定されている。なお、以下の記載において、図１や図２及びそれ以降の図において左側、即ち、ハンドホールの内側や、地中埋設管の管端に向う側を「管端部側」とし、図１や図２及びそれ以降の図において右側、即ち、ハンドホールの外側や、地中埋設管の中央部に向う側を「管中央側」として説明する。 The underground buried pipe 3 is inserted into the piping through hole 4b provided in the wall 4 of the handhole, and the fastening member 1 screwed to the outside of the underground buried pipe 3 and the tip of the underground buried pipe 3. The bell mouth 2 which is screwed to the inner side of the part sandwiches the wall 4 so as to be connected and fixed to the hand hole. In the following description, the left side in FIGS. 1 and 2 and subsequent figures, that is, the inside of the handhole and the side facing the pipe end of the underground pipe is referred to as the “pipe end side”, and FIG. 2 and subsequent figures, the right side, that is, the outside of the handhole and the side facing the central portion of the underground buried pipe will be described as "pipe center side".

地中埋設管３は、大径部と小径部がその軸線方向に交互に設けられたじゃばら状の管壁を有する可撓管であり、特に、大径部と小径部は螺旋状に設けられている。すなわち、地中埋設管３はいわゆる螺旋波付可撓管からなるものであり、典型的には合成樹脂（例えばポリエチレン樹脂）により形成されている。 The underground buried pipe 3 is a flexible pipe having a bellows-shaped pipe wall in which a large diameter portion and a small diameter portion are alternately provided in the axial direction, and in particular, the large diameter portion and the small diameter portion are spirally provided. ing. That is, the underground buried pipe 3 is formed of a so-called flexible pipe with a spiral wave, and is typically formed of synthetic resin (for example, polyethylene resin).

地中埋設管３の先端内側には、ベルマウス２が螺着して取り付けられている。ベルマウス２は、螺着する地中埋設管３の内径よりもその外径がやや小さく形成された円筒状の本体部２１を有し、この本体部２１の外周面には地中埋設管３への螺着時にネジ山となる凸部２１ｂが螺旋状に形成されている。ベルマウス２の本体部２１の管端部側には、貫通孔２１ｄを有する円盤状のフランジ部２１ｃが一体に形成されている。このフランジ部２１ｃのハンドホールの壁面に対向する面に、薄いドーナツ状のシール部材を密着固定すれば、水密性を更に高めることができる。なお、図１の例のように、上記シール部材は、省略してもよい。また、ベルマウス２の具体的形状は、地中埋設管３が管中央側に貫通孔４ｂから抜け出してしまうことを阻止できる限りにおいて、変更してもよく、ベルマウス２を他の構成としてもよい。例えば、ベルマウスを地中埋設管３の外側に螺着させる構成としてもよい。 A bell mouth 2 is attached by screwing to the inside of the tip of the underground buried pipe 3. The bell mouth 2 has a cylindrical main body portion 21 whose outer diameter is slightly smaller than the inner diameter of the underground buried pipe 3 to be screwed, and the outer peripheral surface of the main body portion 21 has the underground buried pipe 3 The convex portion 21b, which becomes a screw thread when screwed to the, is formed in a spiral shape. A disc-shaped flange portion 21c having a through hole 21d is integrally formed on the tube end side of the body portion 21 of the bell mouth 2. If a thin donut-shaped sealing member is closely fixed to the surface of the flange portion 21c facing the wall surface of the handhole, the watertightness can be further enhanced. The seal member may be omitted as in the example of FIG. Further, the specific shape of the bell mouth 2 may be changed as long as it is possible to prevent the underground buried pipe 3 from coming out of the through hole 4b toward the center of the pipe, and the bell mouth 2 may have another configuration. Good. For example, the bell mouth may be screwed to the outside of the underground buried pipe 3.

締付部材１について説明する。締付部材１は、地中埋設管３の螺旋波付じゃばら状の外面と螺合するようにされていて、接続操作の際に締付部材１を回転させて締め付けることで、ベルマウス２と締付部材１の間にハンドホールの壁４が挟持されて、地中埋設管１がハンドホールの配管用貫通孔４ｂに接続固定される。 The fastening member 1 will be described. The tightening member 1 is adapted to be screwed with the spirally corrugated outer surface of the underground buried pipe 3, and by rotating and tightening the tightening member 1 during the connecting operation, The wall 4 of the handhole is sandwiched between the fastening members 1, and the underground pipe 1 is connected and fixed to the pipe through hole 4b of the handhole.

締付部材１は、フランジ部材１１とネジ部材１２とを有している。
フランジ部材１１は、管端部側の一端にフランジ部１１ａを有している。締付部材１の締め付けにより、フランジ部１１ａがハンドホール壁面４ａに向かって押圧される。また、フランジ部材１１は、リング状の第１シール部材１３を有しており、第１シール部材１３はフランジ部１１ａに設けられている。また、本実施形態のフランジ部材１１は、地中埋設管３の外周に配置される円筒状の筒状部１１ｂを有している。 The tightening member 1 has a flange member 11 and a screw member 12.
The flange member 11 has a flange portion 11a at one end on the pipe end side. By tightening the tightening member 1, the flange portion 11a is pressed toward the handhole wall surface 4a. Further, the flange member 11 has a ring-shaped first seal member 13, and the first seal member 13 is provided on the flange portion 11a. Further, the flange member 11 of the present embodiment has a cylindrical tubular portion 11b arranged on the outer periphery of the underground buried pipe 3.

締付部材１のネジ部材１２は、少なくともその内面が地中埋設管３の螺旋波形に対応する螺合部１２ａを有している。すなわち、ネジ部材１２の螺合部１２ａと地中埋設管３とは第１のピッチＰ１のネジで螺合している。ネジ部材１２を地中埋設管３に対して回転させることで、締付部材１が前進／後退して、接続操作がなされる。本実施形態においては、螺合部１２ａよりも管端部側に円筒状の拡径部１２ｂが設けられており、拡径部１２ｂと螺合部１２ａとは、フランジ状に設けられた接続壁１２ｃにより接続されている。また、ネジ部材１２の螺合部１２ａの内周には、波形に沿うように円筒状の第３シール部材１５が一体化されている。 At least the inner surface of the screw member 12 of the tightening member 1 has a screwing portion 12 a corresponding to the spiral waveform of the underground buried pipe 3. That is, the screwing portion 12a of the screw member 12 and the underground buried pipe 3 are screwed together with the screw having the first pitch P1. By rotating the screw member 12 with respect to the underground buried pipe 3, the fastening member 1 is moved forward/backward, and a connecting operation is performed. In the present embodiment, the cylindrical enlarged diameter portion 12b is provided on the pipe end side of the screwed portion 12a, and the enlarged diameter portion 12b and the screwed portion 12a are flange-shaped connection walls. It is connected by 12c. In addition, a cylindrical third seal member 15 is integrated with the inner periphery of the threaded portion 12a of the screw member 12 so as to follow the waveform.

フランジ部材１１とネジ部材１２とは、互いに接合もしくは固定されておらず、地中埋設管３の中心軸ｍ回りに相対回転可能にされている。さらに、フランジ部材１１が地中埋設管３の中央側に向かって変位することをネジ部材１２が規制している。本実施形態においては、フランジ部材１１の筒状部１１ｂの地中埋設管中央側の末端部が、ネジ部材１２の接続壁１２ｃに対し、地中埋設管３の中心軸ｍに沿う方向に当接することにより、変位が規制される。 The flange member 11 and the screw member 12 are not joined or fixed to each other, but are relatively rotatable about the central axis m of the underground buried pipe 3. Further, the screw member 12 regulates the displacement of the flange member 11 toward the center side of the underground buried pipe 3. In the present embodiment, the end portion of the tubular portion 11b of the flange member 11 on the center side of the underground buried pipe contacts the connection wall 12c of the screw member 12 in the direction along the central axis m of the underground buried pipe 3. The displacement is regulated by the contact.

また、フランジ部材１１には筒状の第１筒部（１１ｂ）が設けられると共に、ネジ部材１２には筒状の第２筒部（１２ｂ）が設けられ、第１筒部と第２筒部の一方が他方の内側に入りこむようにされていて、第１筒部と第２筒部の間には、半径方向に挟まれるように円筒状に第２シール部材１４が設けられていることが好ましい。
すなわち、本実施形態においては、上記第１筒部に筒状部１１ｂが対応し、上記第２筒部に拡径部１２ｂが対応していて、フランジ部材の筒状部１１ｂが、ネジ部材の拡径部１２ｂの内側に入り込んでおり、第２シール部材１４は筒状部１１ｂと拡径部１２ｂの間に設けられている。また、第２シール部材１４は、筒状部１１ｂもしくは拡径部１２ｂのいずれか一方に固定されることが好ましい。 Further, the flange member 11 is provided with a tubular first tubular portion (11b), and the screw member 12 is provided with a tubular second tubular portion (12b), and the first tubular portion and the second tubular portion are provided. One of the first and second cylinders may be inserted into the other, and a cylindrical second seal member 14 may be provided between the first cylinder and the second cylinder so as to be sandwiched in the radial direction. preferable.
That is, in the present embodiment, the tubular portion 11b corresponds to the first tubular portion, the expanded diameter portion 12b corresponds to the second tubular portion, and the tubular portion 11b of the flange member corresponds to the screw member. The second seal member 14 is inserted inside the expanded diameter portion 12b, and is provided between the cylindrical portion 11b and the expanded diameter portion 12b. Further, the second seal member 14 is preferably fixed to either the tubular portion 11b or the expanded diameter portion 12b.

第１シール部材１３、第２シール部材１４、第３シール部材１５としては、種々のシール部材、例えば、吸水膨張性不織布（吸水膨張性樹脂を用いた不織布）や、ゴムシート、スポンジシート、ゴムパッキンなどが使用できる。接続操作時に滑りが良くて締付操作がしやすく、シール性も良好であるという観点から、吸水膨張性不織布を含むようにこれらシール部材を構成することが好ましい。これらシール部材は、フランジ部材やネジ部材を成形する際に一体にしてもよいし、成形されたフランジ部材やネジ部材に後工程で接着剤などによって固定してもよい。 As the first seal member 13, the second seal member 14, and the third seal member 15, various seal members, for example, water-swellable non-woven fabric (non-woven fabric using water-swellable resin), rubber sheet, sponge sheet, rubber Packing can be used. It is preferable to configure these sealing members so as to include the water-absorptive non-woven fabric from the viewpoints of good slippage during the connecting operation, easy tightening operation, and good sealing property. These seal members may be integrated when molding the flange member or the screw member, or may be fixed to the molded flange member or the screw member by an adhesive agent or the like in a later step.

本発明の接続構造に使用される締付部材１（フランジ部材１１やネジ部材１２）やベルマウス２は、合成樹脂、好ましくはポリオレフィン系樹脂やポリ塩化ビニル樹脂により、射出成形やブロー成形などの公知の成形方法により成形できる。 The tightening member 1 (flange member 11 or screw member 12) or bell mouth 2 used in the connection structure of the present invention is made of synthetic resin, preferably polyolefin resin or polyvinyl chloride resin, and is used for injection molding or blow molding. It can be molded by a known molding method.

図３は本発明の地中埋設管の接続構造を完成する過程の中間段階を示す図である。
まず、ポリエチレン製の地中埋設管３の先端を垂直に切断し、付着した水や泥を拭き取り、締付部材１を地中埋設管３の外側に螺合するように回転させてねじ込む。すなわち、締付部材１のネジ部材１２の螺合部１２ａが地中埋設管３の先端から奥の方すなわち管中央側に位置するように螺入する。その際、螺入する長さは地中埋設管３を固定するハンドホール壁４の厚さよりも長くしておく。 FIG. 3 is a view showing an intermediate stage of the process of completing the connection structure of the underground buried pipe of the present invention.
First, the tip of the underground buried pipe 3 made of polyethylene is cut vertically, the attached water and mud are wiped off, and the fastening member 1 is rotated and screwed so as to be screwed to the outside of the buried underground pipe 3. That is, the threaded portion 12a of the screw member 12 of the tightening member 1 is screwed so as to be positioned from the tip of the underground buried pipe 3 toward the inner side, that is, on the pipe center side. At that time, the screwing length is set to be longer than the thickness of the handhole wall 4 for fixing the underground buried pipe 3.

次いで、地中埋設管３の先端を、ハンドホールの外側からハンドホールの壁４の配管用貫通孔４ｂに挿通する。次いで、地中埋設管３の先端の内側にベルマウス２の本体部２１をねじ込んでいく（図３に示した中間状態）。そして、ベルマウス２を、配管用貫通孔４ｂに挿通された地中埋設管３の先端に、ベルマウスフランジ部２１ｃが当接するまで螺入して、しっかりと固定する。 Next, the tip of the underground buried pipe 3 is inserted from the outside of the handhole into the through hole 4b for piping of the wall 4 of the handhole. Next, the main body portion 21 of the bell mouth 2 is screwed into the inside of the tip of the underground buried pipe 3 (intermediate state shown in FIG. 3). Then, the bell mouth 2 is screwed into the tip of the underground buried pipe 3 inserted into the through hole 4b for piping until the bell mouth flange portion 21c comes into contact with the pipe, and is firmly fixed.

次いで、締付部材１をハンドホールの壁面４ａに圧接する。すなわち、ハンドホールの外側で締付部材１のネジ部材１２を、接続部材１が壁面４ａに向かって進むように回転させ、フランジ部１１ａ（シール部材１３）がハンドホール壁面４ａに当接する位置まで回転させ、締結する。その結果、ハンドホールの壁４の内側面でもベルマウス２のフランジ部２１ｃが壁４に密着し、壁４をその内外両面からベルマウス２と締付部材１（フランジ部材１１）とで挟持した状態で地中埋設管３がハンドホールの壁面に設けられた配管用貫通孔４ｂに固定され、図１に示したような接続構造が完成される。 Next, the fastening member 1 is pressed against the wall surface 4a of the handhole. That is, the screw member 12 of the tightening member 1 is rotated outside the handhole so that the connecting member 1 advances toward the wall surface 4a, and the flange portion 11a (sealing member 13) contacts the handhole wall surface 4a. Rotate and fasten. As a result, the flange portion 21c of the bell mouth 2 adheres to the wall 4 even on the inner surface of the wall 4 of the handhole, and the wall 4 is sandwiched between the bell mouth 2 and the tightening member 1 (flange member 11) from both the inner and outer surfaces thereof. In this state, the underground pipe 3 is fixed to the pipe through hole 4b provided on the wall surface of the handhole, and the connection structure as shown in FIG. 1 is completed.

ネジ部材の締め込み操作が行いやすように、ネジ部材１２の外周に、スパナやレンチ、治工具などが係合するような、リブや平面部、ノッチ等を設けることが好ましい。 In order to facilitate the tightening operation of the screw member, it is preferable to provide a rib, a flat surface portion, a notch or the like on the outer periphery of the screw member 12 with which a spanner, a wrench, a jig or the like is engaged.

発明の作用および効果を説明する。特許文献１や特許文献２に開示される従来技術においては、締付部材（ホルダ）を締めこむ際に、ハンドホール壁面とフランジの間に挟まれるシール部材の摩擦が大きくなりやすく、締付に必要なトルクが過大なものとなって、十分に締付ができなくなったり、摩擦によりシール部材がはがれたりして、シール性が不十分となるおそれがあった。 The operation and effect of the invention will be described. In the prior arts disclosed in Patent Document 1 and Patent Document 2, when the tightening member (holder) is tightened, the friction of the seal member sandwiched between the wall of the handhole and the flange is likely to be large, and the tightening is difficult. There is a possibility that the required torque becomes excessive and tightening cannot be performed sufficiently, or the seal member is peeled off due to friction, resulting in insufficient sealing performance.

上記実施形態の接続構造によれば、締付部材１がフランジ部材１１とネジ部材１２とに分けて構成され、両者が、相対回転可能とされて、ネジ部材１２によりフランジ部材１１が管端部側に押し付けられる構造となっているため、第１シール部材１３の部分のシールをより確実なものとすることができる。 According to the connection structure of the above-described embodiment, the tightening member 1 is configured by being divided into the flange member 11 and the screw member 12, both of which are rotatable relative to each other, and the screw member 12 causes the flange member 11 to move toward the pipe end portion. Since the structure is pressed to the side, the seal of the portion of the first seal member 13 can be made more reliable.

即ち、接続操作の際にネジ部材１２を締めこんでいくと、フランジ部材１１のフランジ部１１ａや第１シール部材１３がハンドホール壁面４ａに当接するが、そこからさらに締めこんでいく際には、フランジ部材１１やシール部材１３はハンドホールに対し回転させず、ネジ部材だけを締めこんでいけばよい。したがって、強く押し付けられた状態で第１シール部材１３とハンドホール壁面４ａを互いに摺動させる必要がなくなる。その結果、ネジ部材１２の締め付けに必要なトルクが軽減されて、締付操作がしやすくなる。 That is, when the screw member 12 is tightened during the connection operation, the flange portion 11a of the flange member 11 and the first seal member 13 come into contact with the handhole wall surface 4a, but when tightening further from there, The flange member 11 and the seal member 13 do not need to be rotated with respect to the handhole, and only the screw member may be tightened. Therefore, it is not necessary to slide the first seal member 13 and the handhole wall surface 4a against each other while being strongly pressed. As a result, the torque required for tightening the screw member 12 is reduced, and the tightening operation becomes easier.

また、締付操作がしやすくなると、ネジ部材１２をしっかり締めこむことができて、第１シール部材１３に適度な圧縮をかけることが可能となり、シールの確実性が向上する。また、強く押し付けられた状態で第１シール部材１３とハンドホール壁面４ａを互いに摺動させることがなくなるため、第１シール部材がめくれるなどして適切な位置に配置されなくなってしまうことが未然に防止され、これも、シールの確実性の向上に寄与する。 Further, when the tightening operation becomes easy, the screw member 12 can be firmly tightened, the first seal member 13 can be appropriately compressed, and the reliability of the seal is improved. Further, since the first seal member 13 and the handhole wall surface 4a do not slide against each other in a state of being strongly pressed, the first seal member may be turned over and may not be arranged at an appropriate position. It is also prevented, which also contributes to the increased reliability of the seal.

さらに、上記第１実施形態においては、ネジ部材１２によるフランジ部材１１の変位規制が、フランジ部材の地中埋設管中央側の末端部が、ネジ部材に対し、地中埋設管の中心軸に沿う方向に当接する構成により行われており、この構成によれば、締付操作をしやすくしながら、ネジ部材１２による押し付け力を確実にフランジ部材に伝えることができ、シールの確実性がより向上する。特に、当接部において、フランジ部材１１とネジ部材１２とが、樹脂同士で当接し摺動するようにされていると、ネジ部材１２を締めこむ際の締付トルクが低減され、操作がより行いやすくなって好ましい。 Further, in the first embodiment, displacement regulation of the flange member 11 by the screw member 12 is performed such that the end portion of the flange member on the central side of the underground buried pipe is along the central axis of the underground buried pipe with respect to the screw member. With this configuration, the pressing force of the screw member 12 can be reliably transmitted to the flange member while facilitating the tightening operation, and the sealing reliability is further improved. To do. In particular, when the flange member 11 and the screw member 12 are made to contact each other and slide on each other in the contact portion, the tightening torque when tightening the screw member 12 is reduced, and the operation is further improved. It is preferable because it is easy to perform.

また、上記第１実施形態のように、フランジ部材１１には筒状の第１筒部１１ｂが設けられると共に、ネジ部材１２には筒状の第２筒部１２ｂが設けられ、第１筒部１１ｂと第２筒部１２ｂの一方が他方の内側に入りこむようにされて、第１筒部１１ｂと第２筒部１２ｂの間には、半径方向に挟まれるように第２シール部材１４が設けられる構成とした場合には、互いに相対回転するフランジ部材１１とネジ部材１２の間をシールする第２シール部材１４に、ネジ部材１２がフランジ部材１１を押し付ける力が作用しないので、第２シール部材１４の摩擦力によりネジ部材１２とフランジ部材１１の相対回転が妨げられることが抑制され、ネジ部材の締付操作がよりたやすいものとなる。 Further, as in the first embodiment, the flange member 11 is provided with the tubular first tubular portion 11b, and the screw member 12 is provided with the tubular second tubular portion 12b, and the first tubular portion is provided. One of 11b and the 2nd cylinder part 12b is made to enter the inside of the other, and the 2nd seal member 14 is provided between the 1st cylinder part 11b and the 2nd cylinder part 12b so as to be sandwiched in the radial direction. In the case of the configuration described above, the force of pressing the flange member 11 by the screw member 12 does not act on the second seal member 14 that seals between the flange member 11 and the screw member 12 that rotate relative to each other. It is possible to prevent the relative rotation of the screw member 12 and the flange member 11 from being hindered by the frictional force of the screw member 14, and the tightening operation of the screw member becomes easier.

また、フランジ部材１１には筒状の第１筒部１１ｂが設けられると共に、ネジ部材１２には筒状の第２筒部１２ｂが設けられ、第１筒部１１ｂと第２筒部１２ｂの一方が他方の内側に入りこむようにされて、第１筒部１１ｂと第２筒部１２ｂの間には、半径方向に挟まれるように第２シール部材１４が設けられる構成とされていると、シール状態を維持しながら、第１筒部１１ｂと第２筒部１２ｂとが中心軸方向に相対移動可能となるので、両者を相対的に若干傾けて締め付けることも可能となる。したがって、土圧などにより地中埋設管がハンドホール壁面に対し斜めに配置されるような状態となっても、シールが確実に維持されやすくなる。このような構成となっていると、フランジ部材１１とネジ部材１２とが若干傾いた姿勢となることができるため、地中埋設管がハンドホール壁面に対し傾く状態となっても、その傾きをフランジ部材１１とネジ部材１２の間で吸収し、フランジ部材１１がハンドホール壁面に対しまっすぐな姿勢を維持しやすくなるからである。 The flange member 11 is provided with a tubular first tubular portion 11b, and the screw member 12 is provided with a tubular second tubular portion 12b. One of the first tubular portion 11b and the second tubular portion 12b is provided. When the second seal member 14 is provided between the first cylinder portion 11b and the second cylinder portion 12b so as to be sandwiched in the radial direction, the seal is formed. Since the first tubular portion 11b and the second tubular portion 12b can move relative to each other in the central axis direction while maintaining the state, it is also possible to tighten them by slightly inclining them. Therefore, even if the underground pipe is placed obliquely with respect to the wall surface of the handhole due to earth pressure or the like, the seal is easily maintained reliably. With such a configuration, the flange member 11 and the screw member 12 can be in a slightly inclined posture, so that even if the underground buried pipe is inclined with respect to the wall surface of the handhole, the inclination of This is because absorption occurs between the flange member 11 and the screw member 12, and the flange member 11 can easily maintain a straight posture with respect to the wall surface of the handhole.

また、上記第１実施形態のように、ネジ部材１２とフランジ部材１１の間に設けられるシール部材１４が吸水膨張性不織布を含むものである場合には、シール部材１４と他の部材の間の摩擦力がさらに小さくなって、ネジ部材の締付操作がよりたやすいものとなり、シールの確実性も向上する。 When the seal member 14 provided between the screw member 12 and the flange member 11 contains a water-absorptive non-woven fabric as in the first embodiment, the frictional force between the seal member 14 and other members is increased. Is further reduced, the tightening operation of the screw member becomes easier, and the reliability of the seal is improved.

発明は、上記実施形態に限定されるものではなく、種々の改変をして実施することができる。以下に発明の他の実施形態について説明するが、以下の説明においては、上記実施形態と異なる部分を中心に説明し、同様である部分についてはその詳細な説明を省略する。また、これらの実施形態は、その一部を互いに組み合わせて、あるいは、その一部を置き換えて実施できる。 The invention is not limited to the above-described embodiment, but can be implemented with various modifications. Other embodiments of the invention will be described below, but in the following description, portions different from the above-described embodiment will be mainly described, and detailed description of the same portions will be omitted. Moreover, these embodiments can be implemented by combining some of them with each other or by replacing some of them.

上記第１実施形態の説明においては、シール部材１４がフランジ部材１１の筒状部１１ｂの側に取り付けられる例を説明したが、シール部材１４は、ネジ部材１２の拡径部１２ｂに取り付けられていてもよい。また、フランジ部材１１の筒状部１１ｂと、ネジ部材１２の拡径部１２ｂの内外の関係を逆にすることも可能である。すなわち、互いに相対回転可能であり、ネジ部材によりフランジ部材の管中央側への変位が規制される限りにおいて、両者が接する部分の具体的構成や構造、シール部材の配置等は、適宜変更することができる。 In the above description of the first embodiment, the example in which the seal member 14 is attached to the side of the tubular portion 11b of the flange member 11 has been described, but the seal member 14 is attached to the expanded diameter portion 12b of the screw member 12. May be. It is also possible to reverse the relationship between the inside and outside of the tubular portion 11b of the flange member 11 and the expanded diameter portion 12b of the screw member 12. That is, as long as the members can rotate relative to each other and the displacement of the flange member toward the center of the pipe is restricted by the screw member, the specific configuration and structure of the portion in contact with each other, the arrangement of the seal member, etc. should be appropriately changed. You can

図４は、第２実施形態の地中埋設管の接続構造の用いられる締付部材５の構造を示す一部断面図である。本実施形態において、フランジ部材５１が管端部側にフランジ部５１ａとリング状の第１シール部材５３を有する点、および、ネジ部材５２が、螺合部５２ａと円筒状の第３シール部材５５を有し、地中埋設管の外周の螺旋に螺着する点、および、フランジ部材５１とネジ部材５２とが中心軸回りに相対回転可能なようにされている点は、第１実施形態と同様である。本実施形態でも、接続操作の際の締め込み操作がしやすく、壁面と締付部材との間のシール性がより確実になる。 FIG. 4 is a partial cross-sectional view showing the structure of the fastening member 5 used in the underground buried pipe connecting structure of the second embodiment. In the present embodiment, the flange member 51 has the flange portion 51a and the ring-shaped first seal member 53 on the pipe end side, and the screw member 52 is the screw portion 52a and the cylindrical third seal member 55. And that the flange member 51 and the screw member 52 are rotatable relative to each other around the central axis, as compared with the first embodiment. The same is true. Also in this embodiment, the tightening operation at the time of the connecting operation is easy, and the sealing property between the wall surface and the tightening member becomes more reliable.

第２実施形態においては、フランジ部材５１の管中央側に第２フランジ部５１ｂが設けられ、第２フランジ部５１ｂに第２シール部材５４がリング状に設けられている。また、ネジ部材５２の管端部側の端部にフランジ５２ｂが設けられている。フランジ部材５１の第２フランジ部５１ｂと、ネジ部材のフランジ５２ｂとが、互いに対向するよう配置されて、両者の間に第２シール材５４が配置されてこの部分がシールされる。 In the second embodiment, the second flange portion 51b is provided on the pipe center side of the flange member 51, and the second seal member 54 is provided in a ring shape on the second flange portion 51b. A flange 52b is provided at the end of the screw member 52 on the pipe end side. The second flange portion 51b of the flange member 51 and the flange 52b of the screw member are arranged so as to face each other, and the second seal member 54 is arranged between them to seal this portion.

この様な実施形態とする場合には、第２シール部材５４とネジ部材のフランジ５２ｂの摩擦が極力少なくなるよう、第２シール部材を吸水膨張性不織布を含むものとしつつ、フランジ５２ｂの表面を平滑なものとすることが好ましい。 In the case of such an embodiment, the surface of the flange 52b is smoothed while the second seal member includes the water-absorptive non-woven fabric so that the friction between the second seal member 54 and the flange 52b of the screw member is minimized. It is preferable that

また、第２実施形態のように、ネジ部材５２は、複数本のリング状の波付形状とされた弾性部５２ｃを備えていてもよい。弾性部５２ｃを備えていると、弾性部５２ｃが管の中心軸方向の変位や傾きを吸収することができて、第１シール部材を弾力的に押さえつけることができて、接続構造のシール性の確実さが向上する。弾性部５２ｃの具体的な構成は、複数本のリング状の波付形状に限定されず、弾性部をらせん状の凹凸波付形状としてもよい。また、前述した第１実施形態の締付部材１のネジ部材１２において、例えば、螺合部１２ａと接続壁１２ｃの間に、同様の弾性部を備えさせてもよい。 Further, as in the second embodiment, the screw member 52 may include a plurality of ring-shaped corrugated elastic portions 52c. When the elastic portion 52c is provided, the elastic portion 52c can absorb the displacement or inclination of the pipe in the central axis direction, can elastically press the first seal member, and can improve the sealing property of the connection structure. Certainty is improved. The specific configuration of the elastic portion 52c is not limited to a plurality of ring-shaped corrugated shapes, and the elastic portion may have a spiral corrugated shape. In addition, in the screw member 12 of the tightening member 1 of the first embodiment described above, for example, a similar elastic portion may be provided between the screwing portion 12a and the connection wall 12c.

図５は、第３実施形態の地中埋設管の接続構造の用いられる締付部材６の構造を示す一部断面図である。本実施形態においては、螺合部６２ａを有するネジ部材６２の管端部側に位置する拡径部６２ｂの末端部が、フランジ部材６１のフランジ部６１ａを直接押すような構成とされている。このような実施形態としても、接続操作の際の締め込み操作がしやすく、壁面と締付部材との間のシール性がより確実になる。 FIG. 5 is a partial cross-sectional view showing the structure of the tightening member 6 used in the underground buried pipe connecting structure of the third embodiment. In the present embodiment, the end portion of the expanded diameter portion 62b located on the pipe end side of the screw member 62 having the screwing portion 62a is configured to directly press the flange portion 61a of the flange member 61. Even in such an embodiment, the tightening operation at the time of the connecting operation is easy, and the sealing property between the wall surface and the tightening member becomes more reliable.

また、第３実施形態においては、フランジ部材６１の筒状部６１ｂが、ネジ部材６２の拡径部６２ｂの内側に位置するようにされていて、両者の間に配置されるシール部材は、螺合部６２ａの内側まで覆うように設けられている。このような構成にすれば、ネジ部材６２と地中埋設管の間をシールするシール部材と、ネジ部材６２とフランジ部材６１の間をシールするシール部材を兼用するように一体に設けることができて、経済性に優れる。 Further, in the third embodiment, the tubular portion 61b of the flange member 61 is positioned inside the expanded diameter portion 62b of the screw member 62, and the seal member arranged between the two is It is provided so as to cover the inside of the joint portion 62a. With such a configuration, it is possible to integrally provide a seal member that seals between the screw member 62 and the underground pipe and a seal member that seals between the screw member 62 and the flange member 61. And is economical.

なお、フランジ部材とネジ部材とを相対回転可能にしつつ、フランジ部材が管中央側に向かって変位することをネジ部材が規制するための構成としては、上記のような構成だけでなく、他の構成、例えば、両者をネジの構造で接続する構成としてもよい。たとえば、フランジ部材側に雄ネジを設け、ネジ部材側に雌ネジを設けて両者を螺合させるように構成してもよい。その場合は、フランジ部材とネジ部材とが螺合するネジのピッチと、ネジ部材と地中埋設管とが螺合するネジのピッチとが、異なるピッチとなるようにしておけば、ネジ部材の回転操作で、フランジ部材をハンドホール壁に押し付けるようにできる。 In addition, as the configuration for restricting the displacement of the flange member toward the pipe center side by the screw member while making the flange member and the screw member relatively rotatable, not only the above-described configuration but also other A configuration, for example, a configuration in which both are connected by a screw structure may be used. For example, a male screw may be provided on the flange member side and a female screw may be provided on the screw member side so as to be screwed together. In that case, if the pitch of the screw in which the flange member and the screw member are screwed together and the pitch of the screw in which the screw member and the underground buried pipe are screwed are different, The flange member can be pressed against the wall of the handhole by a rotating operation.

上記実施形態の説明においては、地中埋設管が、情報通信用の光ファイバケーブルや、送電用の電気ケーブル、通信用の電線等を挿通する管路として用いられる場合を例として、地中埋設管の接続構造について説明したが、地中埋設管の用途は、これら用途に限定されず、他の用途、例えば気体や液体を送る用途や、各種ホースやチューブ等の配管を挿通配置するための用途とすることも可能である。 In the description of the above embodiments, the underground buried pipe is used as a conduit for inserting an optical fiber cable for information communication, an electric cable for power transmission, an electric wire for communication, etc. as an example. Although the connection structure of the pipe has been described, the application of the underground buried pipe is not limited to these applications, other applications, for example, for sending gas or liquid, for inserting and arranging piping such as various hoses and tubes. It can also be used.

本発明の地中埋設管の接続構造は、例えば通信ケーブルの敷設に使用でき、施工しやすくシール性も良好であって産業上の利用価値が高い。 INDUSTRIAL APPLICABILITY The underground buried pipe connection structure of the present invention can be used, for example, for laying communication cables, is easy to construct, has a good sealing property, and has a high industrial utility value.

１ 締付部材
１１ フランジ部材
１１ａ フランジ部
１１ｂ 筒状部（第１筒状部）
１２ ネジ部材
１２ａ 螺合部
１２ｂ 拡径部（第２筒状部）
１２ｃ 接続壁
１３ 第１シール部材
１４ 第２シール部材
１５ 第３シール部材
２ ベルマウス
３ 地中埋設管
４ ハンドホール壁
５，６ 締付部材
５１，６１ フランジ部材
５２，６２ ネジ部材 1 Tightening member 11 Flange member 11a Flange portion 11b Cylindrical portion (first tubular portion)
12 screw member 12a screwing portion 12b expanded diameter portion (second tubular portion)
12c Connection wall 13 First seal member 14 Second seal member 15 Third seal member 2 Bell mouth 3 Underground pipe 4 Handhole wall 5, 6 Tightening member 51, 61 Flange member 52, 62 Screw member

Claims (3)

ハンドホールなどの壁面に設けられた配管用貫通孔に、螺旋波付可撓管からなる地中埋設管を、地中埋設管の外側に螺合される締付部材と地中埋設管の先端に螺着したベルマウスとで固定する接続構造であって、
前記締付部材は、フランジ部材とネジ部材とを有しており、
フランジ部材は、前記壁面に向かって押圧されるフランジ部と、フランジ部に設けられたリング状の第１シール部材とを一端部に有し、
ネジ部材は少なくともその内面が地中埋設管の螺旋波形に対応する螺合部を有し、
フランジ部材とネジ部材とは、地中埋設管の中心軸回りに相対回転可能にされつつ、
フランジ部材とネジ部材はネジ構造で接続されておらず、
フランジ部材の地中埋設管中央側の末端部が、ネジ部材に対し、地中埋設管の中心軸に沿う方向に当接することにより、フランジ部材が地中埋設管の中央側に向かって変位することをネジ部材が規制している
地中埋設管の接続構造。 In the through hole for piping provided in the wall surface of the handhole, etc., the underground buried pipe consisting of a flexible pipe with a spiral wave is tightened on the outside of the underground buried pipe, and the tip of the underground buried pipe. A connection structure that is fixed with a bell mouth screwed to
The tightening member has a flange member and a screw member,
The flange member has a flange portion pressed toward the wall surface and a ring-shaped first seal member provided on the flange portion at one end portion,
At least the inner surface of the screw member has a threaded portion corresponding to the spiral corrugation of the underground pipe,
The flange member and the screw member are relatively rotatable about the central axis of the underground pipe,
The flange member and the screw member are not connected by a screw structure,
The flange member is displaced toward the center side of the underground buried pipe by abutting the end portion of the flange member on the center side of the underground buried pipe against the screw member in the direction along the central axis of the underground buried pipe. A connection structure for underground pipes that is regulated by screw members. フランジ部材には筒状の第１筒部が設けられると共に、ネジ部材には筒状の第２筒部が設けられ、第１筒部と第２筒部の一方が他方の内側に入りこむようにされて、
第１筒部と第２筒部の間には、半径方向に挟まれるように第２シール部材が設けられている
請求項１に記載の地中埋設管の接続構造。 The flange member is provided with a tubular first tubular portion, and the screw member is provided with a tubular second tubular portion so that one of the first tubular portion and the second tubular portion may enter the inside of the other. Has been
A second seal member is provided between the first tubular portion and the second tubular portion so as to be sandwiched in the radial direction.
The underground underground connection structure according to claim 1 . 第２シール部材が吸水膨張性不織布を含む請求項２に記載の地中埋設管の接続構造。 The underground buried pipe connection structure according to claim 2, wherein the second seal member includes a water-absorptive non-woven fabric.
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