JP6134252B2

JP6134252B2 - Pipe fitting and manufacturing method thereof

Info

Publication number: JP6134252B2
Application number: JP2013229975A
Authority: JP
Inventors: 佑一藤本
Original assignee: Tigers Polymer Corp
Current assignee: Tigers Polymer Corp
Priority date: 2013-11-06
Filing date: 2013-11-06
Publication date: 2017-05-24
Anticipated expiration: 2033-11-06
Also published as: JP2015090181A

Description

本発明は、螺旋状波付管（例えば地中に埋設される光ケーブル等の保護管や橋梁等に使用されるケーブル保護シース管）を接続するのに使用される管継手、特に吸水膨張性を有する素材をシール材に使用した管継手、およびその製造方法に関する。 The present invention relates to a pipe joint used for connecting a spiral corrugated pipe (for example, a protective pipe such as an optical cable buried in the ground or a cable protective sheath pipe used for a bridge), particularly a water-absorbing expansibility. The present invention relates to a pipe joint using a material having a sealing material, and a manufacturing method thereof.

このような管継手やその製造方法について、特許文献１や特許文献２に開示されたようなものが知られている。特許文献１には、吸水膨張性の樹脂素材からなる繊維シートを円筒状に捲回して、管継手の内周面に成形一体化した管継手が開示されている。また、特許文献２には、吸水膨張性の樹脂粉末を担持させた長方形状のシール材を略円筒状に捲回して、管継手の内周面に成形一体化した管継手が開示されている。このような管継手は、接続する管の端部に管継手をねじ込むだけで、管と簡単に接続できると共に、管継手内面に設けられた吸水膨張性素材の作用により、接続部に水が来た際には、吸水膨張性素材が膨張して接続部の隙間を封止して接続部の止水性を発揮するものである。 About such a pipe joint and its manufacturing method, what was disclosed by patent document 1 or patent document 2 is known. Patent Document 1 discloses a pipe joint in which a fiber sheet made of a water-swellable resin material is wound into a cylindrical shape and molded and integrated on the inner peripheral surface of the pipe joint. Patent Document 2 discloses a pipe joint in which a rectangular sealing material carrying a water-swellable resin powder is wound into a substantially cylindrical shape and molded and integrated on the inner peripheral surface of the pipe joint. . Such a pipe joint can be easily connected to the pipe simply by screwing the pipe joint into the end of the pipe to be connected, and water is brought to the connection part by the action of the water-absorbing and expansive material provided on the inner surface of the pipe joint. In this case, the water-swellable material expands and seals the gaps between the connecting portions to exhibit the water-stopping properties of the connecting portions.

また、特許文献３には、螺旋状波付管用の管継手において、吸水膨張性素材製のシール材を、所定の間隔を有するような螺旋状に配設される第１シール材と、第１シール材の隣り合う部分にまたがって配設される第２シール材により構成する技術が開示されている。 Further, in Patent Document 3, in a pipe joint for a spiral corrugated pipe, a seal material made of a water-swellable material is arranged in a spiral shape having a predetermined interval; A technique is disclosed that includes a second sealing material disposed across adjacent portions of the sealing material.

実公平７−５２４６７号公報No. 7-52467 実公平８−９５１０号公報No. 8-9510 特開２０１１−１２０４６９号公報JP 2011-120469 A

これら吸水膨張性素材を使用した管継手においては、確実な止水性が求められている。止水性が不十分であると、管の内部に水が進入して配線やケーブルの機能が損なわれるおそれがある。 In pipe joints using these water-absorbing expandable materials, a certain water-stopping property is required. If the water stoppage is insufficient, water may enter the inside of the pipe and the functions of the wiring and cable may be impaired.

しかしながら、これら管継手において、止水の確実性については、以下のようにいまだ改善の余地がある。
螺旋状波付管は可撓性を有しているので、管路をカーブさせて配設できる点がメリットとなっている。しかしながら、発明者らが検討したところ、管継手によって螺旋状波付管が接続される部分が、管路のカーブした部分に設けられると、管継手の止水性の確実性が損なわれうることが判明した。 However, in these pipe joints, there is still room for improvement as to the certainty of water stoppage as follows.
Since the spiral corrugated tube has flexibility, it is advantageous in that it can be arranged with a curved curve. However, as a result of investigations by the inventors, if the portion where the spiral corrugated pipe is connected by the pipe joint is provided in a curved portion of the pipe line, the certainty of the water stoppage of the pipe joint may be impaired. found.

本発明の目的は、螺旋状波付管を接続する管継手の止水性をより確実なものとすることにある。
An object of the present invention is to make the water stoppage of a pipe joint connecting helical corrugated pipes more reliable.

発明者は、鋭意検討の結果、螺旋状凹凸条を有する管継手本体部材の外面の凹溝部分に、凹溝の両側を橋渡しするように、螺旋状の連結部材を接合一体化すると、管路が曲がった部分で管継手を使用しても、管継手の止水性が損なわれにくくなることを知見し、本発明を完成させた。 As a result of intensive studies, the inventor joined and integrated the spiral connecting member so as to bridge both sides of the concave groove to the concave groove portion on the outer surface of the pipe joint main body member having the spiral concave and convex strips. It was found that even if a pipe joint is used at a bent portion, the water stoppage of the pipe joint is hardly impaired, and the present invention has been completed.

本発明は、螺旋状波付管に螺合させて接続可能であり、略円筒状の管継手本体部材の内周面に、接続すべき螺旋状波付管の外周面と対向するようにシール材を一体化した管継手であって、前記管継手本体部材は、螺旋状凹凸条を有する波付円筒状に形成されており、シール材は、吸水膨張性素材からなるシール材であるとともに、前記螺旋状凹凸条に対応して管継手本体部材外面に現れる凹溝には、凹溝に沿って、螺旋状連結部材が配設されており、前記螺旋状連結部材によって、管継手本体部材の凹溝の側面部もしくは凹溝に隣接する肩部が、凹溝底部をまたいで橋渡しされるように、螺旋状連結部材が管継手本体部材に接合一体化された管継手である（第１発明）。 The present invention can be connected by screwing into a spiral corrugated pipe, and seals the inner peripheral surface of a substantially cylindrical pipe joint body member so as to face the outer peripheral surface of the spiral corrugated pipe to be connected. A pipe joint in which materials are integrated, wherein the pipe joint body member is formed in a corrugated cylindrical shape having a spiral ridge, and the seal material is a seal material made of a water-swellable material, A spiral coupling member is disposed along the concave groove in the concave groove appearing on the outer surface of the pipe joint main body member corresponding to the spiral concave and convex strips. A pipe joint in which a spiral connecting member is joined and integrated with a pipe joint body member so that a side surface portion of the groove or a shoulder adjacent to the groove is bridged across the groove bottom (first invention). ).

本発明においては、螺旋状連結部材が、溶着により、管継手本体部材に接合一体化されることが好ましい（第２発明）。 In the present invention, it is preferable that the helical connecting member is integrally joined to the pipe joint main body member by welding ( second invention).

また、本発明は、第２発明の管継手を製造する方法であって、管継手の製造方法は、スパイラル成形法により中空管状の管継手前駆体を連続成形するスパイラル成形工程と、形成された管継手前駆体を所定の長さに切断する切断工程と、を含み、前記スパイラル成形工程において、樹脂の押出装置から第１の合成樹脂条帯を所定の断面に半溶融状態で押出して、管の成形装置の成形軸に供給し、螺旋状に捲回して、隣接する合成樹脂条帯の両側端部を互いに溶着一体化して、後に管継手本体部材となるべき螺旋状凹凸条を有する波付円筒状の合成樹脂筒を形成すると共に、吸水膨張性素材からなる所定幅の条帯を、第１合成樹脂条帯の内側となるように前記成形軸に供給し、螺旋状に捲回して、前記合成樹脂筒の内側に配設一体化し、さらに、樹脂の押出装置から第２の合成樹脂条帯を所定の断面に半溶融状態で押出して、前記波付円筒状合成樹脂筒の外面に現れる螺旋状の凹溝の部分に供給し、第２の合成樹脂条帯を前記波付円筒状合成樹脂筒の螺旋状凹溝の部分に溶着させ、前記切断工程において、管継手前駆体を所定の長さに切断して、前記合成樹脂筒を管継手本体部材とすることを特徴とする管継手の製造方法である（第３発明）。 Further, the present invention is a method for manufacturing a pipe joint of the second invention, wherein the pipe joint manufacturing method is formed by a spiral forming step of continuously forming a hollow tubular pipe joint precursor by a spiral forming method. Cutting a pipe joint precursor into a predetermined length, and in the spiral molding process, a first synthetic resin strip is extruded from a resin extrusion device into a predetermined cross section in a semi-molten state. Is supplied to the molding shaft of the molding machine, wound spirally, and welded and integrated with both end portions of the adjacent synthetic resin strips to have a corrugated spiral strip to be a pipe joint body member later. While forming a cylindrical synthetic resin tube, supplying a strip of a predetermined width made of a water-swellable material to the molding shaft so as to be inside the first synthetic resin strip, wound in a spiral shape, Integrated and integrated inside the synthetic resin cylinder; A second synthetic resin strip is extruded from a resin extrusion device into a predetermined cross section in a semi-molten state, and is supplied to a spiral groove portion that appears on the outer surface of the corrugated cylindrical synthetic resin cylinder. The synthetic resin strip is welded to the spiral groove portion of the corrugated cylindrical synthetic resin cylinder, and in the cutting step, the pipe joint precursor is cut to a predetermined length, and the synthetic resin cylinder is pipe-jointed. It is a manufacturing method of the pipe joint characterized by making it a main-body member ( 3rd invention).

本発明の管継手（第１発明）によれば、螺旋状波付管を接続する管継手の止水性をより確実なものとできるという効果が得られる。 According to the pipe joint (the first invention) of the present invention, an effect that the water stoppage of the pipe joint connecting the spiral corrugated pipe can be made more reliable is obtained.

さらに、第２発明や第３発明の構成の管継手であれば、スパイラル成形法を応用することにより効率的に製造できるという効果も得られる。また第４発明にかかる管継手の製造方法によれば、本発明の管継手を特に効率的に製造できる。
Furthermore, if it is a pipe joint of the structure of 2nd invention or 3rd invention, the effect that it can manufacture efficiently by applying a spiral forming method is also acquired. Moreover, according to the manufacturing method of the pipe joint concerning the 4th invention, the pipe joint of the present invention can be manufactured especially efficiently.

第１実施形態の管継手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 pipe joint of 1st Embodiment. 管継手の使用形態例を示す模式図である。It is a schematic diagram which shows the usage example of a pipe joint. 第１実施形態の管継手の製造方法におけるスパイラル成形工程を示す模式図である。It is a schematic diagram which shows the spiral shaping | molding process in the manufacturing method of the pipe joint of 1st Embodiment. 第２実施形態の管継手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 pipe joint of 2nd Embodiment.

以下図面を参照しながら、地中埋設管に使用される螺旋状波付管の管継手を例として、発明の実施形態について説明する。なお、本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。 Hereinafter, embodiments of the invention will be described with reference to the drawings, taking as an example a pipe joint of a helical corrugated pipe used for underground pipes. In addition, this invention is not limited to the separate embodiment shown below, The form can also be changed and implemented.

図１は第１実施形態の管継手１を示す一部断面図であり、管継手１の上側半分を断面図として、下側半分を外観図として示す。略円筒状の管継手１は、管継手本体部材１１の内周面に、略円筒状に形成されたシール材１２が、接続すべき管の外周面と対向するように一体化された管継手である。
管継手１は、外周面が螺旋状の凹凸条に形成された螺旋状波付管２を接続するための管継手である。
図２に管継手１の使用形態を示す。螺旋状波付管２の外周の螺旋凹凸条と、管継手内周面の螺旋凹凸条を合致させて、螺旋状波付管２を管継手１の内側にねじ込むように相対回転させて、螺旋状波付管２と管継手１とを螺合させて接続する。そして、管継手１の両側から、螺旋状波付管の端部をそれぞれねじ込むことにより、一対の螺旋状波付管が接続できる。図２（ｂ）には、螺旋状波付管２を、管継手１の略中央部までねじ込んで、管継手１と螺旋状波付管２とを接続した接続構造を示している。 FIG. 1 is a partial cross-sectional view showing a pipe joint 1 according to the first embodiment, and shows an upper half of the pipe joint 1 as a cross-sectional view and a lower half as an external view. The substantially cylindrical pipe joint 1 is a pipe joint in which a seal member 12 formed in a substantially cylindrical shape is integrated on the inner peripheral surface of a pipe joint main body member 11 so as to face the outer peripheral surface of a pipe to be connected. It is.
The pipe joint 1 is a pipe joint for connecting a spiral corrugated pipe 2 whose outer peripheral surface is formed in a spiral rugged strip.
FIG. 2 shows how the pipe joint 1 is used. The spiral corrugations on the outer periphery of the spiral corrugated pipe 2 and the spiral corrugations on the inner peripheral surface of the pipe joint are matched, and the spiral corrugated pipe 2 is relatively rotated so as to be screwed into the inner side of the pipe joint 1. The corrugated pipe 2 and the pipe joint 1 are connected by screwing. And a pair of spiral corrugated pipes can be connected by screwing the ends of the spiral corrugated pipes from both sides of the pipe joint 1. FIG. 2B shows a connection structure in which the spiral corrugated pipe 2 is screwed to the substantially central portion of the pipe joint 1 and the pipe joint 1 and the spiral corrugated pipe 2 are connected.

管継手１は、略円筒状の管継手本体部材１１と、管継手本体部材１１の内周面に設けられたシール材１２と、管継手本体部材１１の外側に接合一体化された螺旋状連結部材１３とを有している。 The pipe joint 1 includes a substantially cylindrical pipe joint main body member 11, a seal member 12 provided on the inner peripheral surface of the pipe joint main body member 11, and a helical connection joined and integrated to the outside of the pipe joint main body member 11. Member 13.

管継手本体部材１１は、螺旋状凹凸条を有する波付円筒状に形成されている。管継手本体部材１１は、接続すべき螺旋状波付管２の外周面の螺旋状凹凸形状に略合致し、適度なクリアランスを有するように、螺旋状の凹凸条（即ち大径部と小径部）を有する内周面が形成された略円筒状の部材である。管継手本体部材は、典型的には合成樹脂製であり、射出成形や後述するスパイラル成形などによって成形されうる。本実施形態においては、管継手本体部材１１の管壁は略均一な肉厚に形成されているが、管壁の肉厚は部分的に変更されていても良い。 The pipe joint main body member 11 is formed in a corrugated cylindrical shape having a helical ridge. The pipe joint body member 11 has a spiral ridge (that is, a large-diameter portion and a small-diameter portion so as to substantially match the spiral concavo-convex shape of the outer peripheral surface of the spiral corrugated pipe 2 to be connected and to have an appropriate clearance. ) Is a substantially cylindrical member formed with an inner peripheral surface. The pipe joint body member is typically made of a synthetic resin and can be formed by injection molding, spiral molding described later, or the like. In the present embodiment, the pipe wall of the pipe joint body member 11 is formed to have a substantially uniform thickness, but the thickness of the pipe wall may be partially changed.

管継手本体部材１１の管壁は、管壁全体が、半径方向外側に突出した大径部１１１と半径方向内側に凹入する小径部１１２とが交互に螺旋状凹凸条をなすように設けられた波付状に形成されている。管継手の外側から見た場合、小径部１１２の部分は、螺旋状の凹溝として現れる。すなわち、管継手本体部材の外面には、小径部１１２に対応して現れる螺旋状の凹溝が存在する。 The pipe wall of the pipe joint body member 11 is provided so that the entire pipe wall is alternately formed with spiral concavo-convex strips of large-diameter portions 111 protruding radially outward and small-diameter portions 112 recessed radially inward. It is formed in a wavy shape. When viewed from the outside of the pipe joint, the portion of the small diameter portion 112 appears as a spiral concave groove. That is, there is a spiral concave groove that appears corresponding to the small diameter portion 112 on the outer surface of the pipe joint body member.

管継手本体部材１１の外周面側には、螺旋状連結部材１３が接合一体化されている。螺旋状連結部材１３は、管継手本体部材１１の外面に現れる凹溝に沿って螺旋状に配設されている。本実施形態においては、螺旋状連結部材１３も合成樹脂製である。螺旋状連結部材１３は、管継手本体部材１１と同種の合成樹脂製であることが好ましく、同じ合成樹脂製であることが特に好ましい。あるいは、ホットメルト接着剤のような熱可塑性樹脂によって螺旋状連結部材１３を形成することも好ましい実施の形態である。 On the outer peripheral surface side of the pipe joint main body member 11, a spiral connecting member 13 is joined and integrated. The spiral connecting member 13 is spirally disposed along the concave groove that appears on the outer surface of the pipe joint main body member 11. In the present embodiment, the helical connection member 13 is also made of synthetic resin. The helical connecting member 13 is preferably made of the same type of synthetic resin as the pipe joint main body member 11, and is particularly preferably made of the same synthetic resin. Alternatively, it is also a preferred embodiment to form the spiral connecting member 13 with a thermoplastic resin such as a hot melt adhesive.

そして、螺旋状連結部材１３によって、凹溝の両側が橋渡しされるように、螺旋状連結部材１３が管継手本体部材１１に接合一体化されている。換言すると、管継手本体部材１１の外面に現れる凹溝の側面部１１４、１１４もしくは凹溝に隣接する肩部１１５，１１５が、螺旋状連結部材１３によって、凹溝底部１１３をまたいで橋渡しされるように、螺旋状連結部材１３の両側縁が管継手本体部材１１に接合一体化されている。 The spiral coupling member 13 is joined and integrated with the pipe joint main body member 11 so that both sides of the groove are bridged by the spiral coupling member 13. In other words, the side surface portions 114 and 114 of the concave groove appearing on the outer surface of the pipe joint main body member 11 or the shoulder portions 115 and 115 adjacent to the concave groove are bridged across the concave groove bottom portion 113 by the spiral connecting member 13. As described above, both side edges of the spiral connecting member 13 are joined and integrated with the pipe joint body member 11.

ここで、凹溝底部１１３とは、管継手本体部材１１の外面に現れる凹溝の底に該当する部分であり、管継手本体部材１１の小径部１１２に該当する部分である。また、凹溝の肩部１１５とは、管継手本体部材の大径部１１１の一部であって、凹溝に隣接する部分である。また、凹溝の側面部１１４とは、凹溝底部１１３と凹溝の肩部１１５との間を接続する部分である。 Here, the concave groove bottom portion 113 is a portion corresponding to the bottom of the concave groove appearing on the outer surface of the pipe joint main body member 11, and is a portion corresponding to the small diameter portion 112 of the pipe joint main body member 11. Moreover, the shoulder part 115 of a ditch | groove is a part of the large diameter part 111 of a pipe joint main body member, Comprising: It is a part adjacent to a ditch | groove. Further, the side surface portion 114 of the concave groove is a portion that connects the concave groove bottom portion 113 and the shoulder portion 115 of the concave groove.

本実施形態においては、螺旋状連結部材１３によって、凹溝の側面部１１４と側面部１１４が互いに橋渡しされている。螺旋状連結部材は、後述する実施形態にように、凹溝の肩部と肩部が互いに橋渡しされるように設けられてもよい。あるいは、螺旋状連結部材は、凹溝の肩部と凹溝の側面部とが互いに橋渡しされるように設けられてもよい。 In the present embodiment, the spiral connecting member 13 bridges the side surface portion 114 and the side surface portion 114 of the groove. The spiral connecting member may be provided so that the shoulder portion of the groove and the shoulder portion are bridged to each other as in the embodiment described later. Alternatively, the spiral connecting member may be provided so that the shoulder portion of the concave groove and the side surface portion of the concave groove are bridged to each other.

管継手本体部材１１と螺旋状連結部材１３の接合一体化には、種々の手段が採用できる。特に、管継手本体部材や螺旋状連結部材が合成樹脂製である場合には、接着や溶着により、両者を接合一体化することが好ましい。本実施形態においては、高密度ポリエチレン樹脂によって、管継手本体部材１１と螺旋状連結部材１３を形成し、両者を溶着によって接合一体化している。 Various means can be adopted for joining and integrating the pipe joint main body member 11 and the helical connecting member 13. In particular, when the pipe joint main body member and the helical connecting member are made of synthetic resin, it is preferable to join and integrate them by adhesion or welding. In this embodiment, the pipe joint main body member 11 and the helical connection member 13 are formed of high-density polyethylene resin, and both are joined and integrated by welding.

シール材１２は、吸水膨張性素材からなるシール材である。シール材１２は、管継手本体部材１１の内周面に一体化されていて、シール材１２によって、螺旋状波付管２の外周面と管継手本体部材１１の内周面の間がシールされる。
吸水膨張性素材としては、吸水膨張性樹脂製の素材や吸水膨張性ゴムや、吸水膨張性不織布などが例示されるが、吸水膨張性不織布が特に好ましく使用できる。 The sealing material 12 is a sealing material made of a water-swellable material. The seal material 12 is integrated with the inner peripheral surface of the pipe joint main body member 11, and the seal material 12 seals between the outer peripheral surface of the spiral corrugated pipe 2 and the inner peripheral surface of the pipe joint main body member 11. The
Examples of the water-swellable material include a water-swellable resin material, a water-swellable rubber, and a water-swellable nonwoven fabric. A water-swellable nonwoven fabric is particularly preferably used.

本実施形態においてシール材１２を構成する吸水膨張性不織布とは、不織布素材に吸水膨張性樹脂を担持させた不織布である。吸水膨張性樹脂の担持の形態は、粉末状、繊維状、含浸、コーティングなどの形態とすることができる。吸水膨張性樹脂とは、水分を吸収して膨張する性質を有する樹脂であり、ポリアクリル酸ナトリウム塩を主成分とした樹脂やアルケン（アルキレン）オキサイド変性物を主成分として含む樹脂を例示することができる。特に後者は、海水などのイオン濃度が比較的高い水分に対しても吸水膨張性を発揮するので、塩分の多い使用環境においては後者を使用することが好ましい。
市販されている吸水膨張性樹脂としては、例えば、ランシール（登録商標東洋紡績株式会社製品）などの繊維状製品が例示できる。アルケン（アルキレン）オキサイド変性物系の吸水膨張性樹脂としては、アクアコーク（登録商標住友精化株式会社製品）が例示できる。 In the present embodiment, the water-swellable nonwoven fabric constituting the sealing material 12 is a nonwoven fabric in which a water-swellable resin is supported on a nonwoven fabric material. The form of supporting the water-absorbing expandable resin can be in the form of powder, fiber, impregnation, coating, or the like. The water-absorbing expandable resin is a resin that has the property of absorbing moisture and swells, and exemplifies a resin containing polyacrylic acid sodium salt as a main component or a resin containing an alkene (alkylene) oxide modified compound as a main component. Can do. In particular, the latter exhibits a water-swelling property even with respect to water having a relatively high ion concentration such as seawater. Therefore, it is preferable to use the latter in an environment where the amount of salt is high.
Examples of commercially available water-swellable resins include fibrous products such as Lanseal (registered trademark Toyobo Co., Ltd. product). Examples of the alkene (alkylene) oxide-modified water-absorbent expandable resin include Aqua Coke (registered trademark, Sumitomo Seika Co., Ltd.).

不織布素材を構成する基材繊維は特に限定されるものではないが、合成樹脂繊維であることが好ましく、ポリエステル繊維やナイロン繊維、ポリエチレンテレフタレート繊維、アクリル繊維、ポリプロピレン繊維などの合成樹脂繊維が使用できる。基材繊維は、ポリプロピレン繊維やポリエチレンテレフタレート（ＰＥＴ）繊維のような親水性に乏しい繊維でもよいが、アクリル繊維、ナイロン繊維のような親水性の繊維であることが望ましい。不織布層に適度な弾力性が得られるよう、不織布の目付けは１００〜５００ｇ／平方メートルくらいが好ましい。 The base fiber constituting the nonwoven material is not particularly limited, but is preferably a synthetic resin fiber, and synthetic resin fibers such as polyester fiber, nylon fiber, polyethylene terephthalate fiber, acrylic fiber, and polypropylene fiber can be used. . The base fiber may be a poorly hydrophilic fiber such as polypropylene fiber or polyethylene terephthalate (PET) fiber, but is preferably a hydrophilic fiber such as acrylic fiber or nylon fiber. The basis weight of the nonwoven fabric is preferably about 100 to 500 g / square meter so that a suitable elasticity can be obtained in the nonwoven fabric layer.

また、シール材１２を構成する素材には、吸水膨張性不織布に限定されるものではなく、水分を吸収して膨張する素材でシール性を発揮する素材あれば、他の吸水膨張性素材を使用することもできる。他の吸水膨張性素材としては、例えば、前述した吸水膨張性樹脂をシート状やひも状に加工した素材およびこれら素材を、ゴムや樹脂や透水性素材などからなる他のシート状素材に積層した素材などが例示できる。管継手と螺旋状波付管を接続する際の接続操作の容易さを高めるために、発明に使用する吸水膨張性素材は弾力性やクッション性を備えるものであることが好ましく、また、管継手本体部材１１の内周面に沿って一体化しやすいような柔軟性と伸縮性を有するものであることが好ましい。このような性質を有するものとして、特に不織布状のものが適している。 In addition, the material constituting the sealing material 12 is not limited to the water-absorbable expandable nonwoven fabric, and other water-absorbable expandable materials can be used as long as the material absorbs moisture and expands and exhibits a sealing property. You can also Other water-swellable materials include, for example, materials obtained by processing the above-described water-swellable resin into a sheet or string shape, and these materials are laminated on other sheet-like materials made of rubber, resin, water permeable material, etc. A material etc. can be illustrated. In order to increase the ease of connection operation when connecting a pipe joint and a spiral corrugated pipe, it is preferable that the water-absorbable expandable material used in the invention has elasticity and cushioning properties. It is preferable to have flexibility and stretchability so as to be easily integrated along the inner peripheral surface of the main body member 11. Nonwoven fabrics are particularly suitable as those having such properties.

本実施形態においては、シール材１２は第１シール部材１２１と第２シール部材１２２とにより構成されている。
吸水膨張性不織布からなる第１シール部材１２１は、所定幅に裁断されたテープ状の吸水膨張性不織布（Ｔ１）を、管継手本体部材１１の大径部１１１の内側に位置するように、その側縁同士が所定の間隔で離間するように螺旋状に捲回して、管継手本体部材内周面に貼り付けて一体化したものである。すなわち、第１シール部材１２１は、管継手本体部材１１が有する螺旋状凹凸条に沿って、螺旋状に設けられている。また、第１シール部材１２１は、管継手１の全長（軸方向の全長）にわたって螺旋状に連続して配設されている。 In the present embodiment, the sealing material 12 includes a first sealing member 121 and a second sealing member 122.
The first seal member 121 made of a water-absorbent expandable nonwoven fabric is a tape-like water-expandable nonwoven fabric (T1) cut to a predetermined width so that the first seal member 121 is positioned inside the large-diameter portion 111 of the pipe joint main body member 11. The side edges are spirally wound so as to be separated from each other at a predetermined interval, and are attached to and integrated with the inner peripheral surface of the pipe joint body member. That is, the first seal member 121 is provided in a spiral shape along the spiral ridges of the pipe joint body member 11. Further, the first seal member 121 is continuously disposed in a spiral shape over the entire length of the pipe joint 1 (the total length in the axial direction).

吸水膨張性不織布からなる第２シール部材１２２は、第１シール材が互いに離間している部分をまたいで橋渡しするように設けられ、管継手本体部材１１の内周面の凹凸に追従して貼り付けられている。特に、本実施形態では、第２シール部材１２２は、管継手の中心軸とほぼ平行に、管継手の全長にわたって、直線状に設けられている。
螺旋状の第１シール部材１２１と、またぐように設けられた第２シール部材１２２が組み合わせられて、閉じたリング状のシールライン（図１中で破線で示す）が形成されて、接続部分のシールがなされる。 The second seal member 122 made of a water-absorbent expandable nonwoven fabric is provided so as to bridge the part where the first seal material is spaced from each other, and is attached following the unevenness of the inner peripheral surface of the pipe joint body member 11. It is attached. In particular, in the present embodiment, the second seal member 122 is provided linearly over the entire length of the pipe joint substantially parallel to the central axis of the pipe joint.
The first seal member 121 having a spiral shape and the second seal member 122 provided so as to straddle are combined to form a closed ring-shaped seal line (shown by a broken line in FIG. 1). A seal is made.

第１実施形態の管継手の製造方法について、その一例を説明する。管継手１は、スパイラル成形法により中空管状の管継手前駆体Ｐを連続成形するスパイラル成形工程と、形成された管継手前駆体Ｐを所定の長さに切断する切断工程とを含む製造工程により、製造できる。管継手前駆体Ｐは、管継手１の管継手本体部材１１を長さ方向に延長したような外観を有する中空管状の部材であって、シール部材を内周に備えた部材である。管継手前駆体Ｐを所定長さに切断すると、管継手１の管継手本体部材１１やその他の部分が得られる。 An example of the manufacturing method of the pipe joint of the first embodiment will be described. The pipe fitting 1 is manufactured by a manufacturing process including a spiral forming process of continuously forming a hollow tubular pipe joint precursor P by a spiral forming method and a cutting process of cutting the formed pipe joint precursor P into a predetermined length. Can be manufactured. The pipe joint precursor P is a hollow tubular member having an appearance such that the pipe joint body member 11 of the pipe joint 1 is extended in the length direction, and is a member provided with a seal member on the inner periphery. When the pipe joint precursor P is cut into a predetermined length, the pipe joint body member 11 and other parts of the pipe joint 1 are obtained.

管継手前駆体Ｐを連続成形するスパイラル成形工程について説明する。図３は不定長の管継手前駆体Ｐを連続形成するスパイラル成形工程を示す模式図である。
本工程においては、公知の管成形装置の回転駆動される管成形軸ＳＦＴに、所定幅に裁断された吸水膨張性素材のテープＴ１と、樹脂の押出装置から所定の断面（本実施例では逆ハット形状）に押出された半溶融状態の第１合成樹脂条帯Ｔ２と、別の所定断面に押出された半溶融状態の第２合成樹脂条帯Ｔ３とを、連続的に供給しながら螺旋状に巻きつけて、不定長の管継手前駆体Ｐを連続して形成する。 A spiral molding process for continuously molding the pipe joint precursor P will be described. FIG. 3 is a schematic view showing a spiral molding process for continuously forming a pipe joint precursor P having an indefinite length.
In this process, a pipe forming shaft SFT that is rotationally driven by a known pipe forming apparatus is subjected to a predetermined cross section (in the present embodiment, reverse) from a water-swellable material tape T1 cut to a predetermined width and a resin extrusion apparatus. The first synthetic resin strip T2 in a semi-molten state extruded in a hat shape) and the second synthetic resin strip T3 in a semi-molten state extruded in another predetermined cross-section are continuously spirally fed. The pipe joint precursor P having an indefinite length is continuously formed.

その際、吸水膨張性不織布製のテープＴ１は、管成形軸ＳＦＴに螺旋状に捲回され、テープＴ１の互いに隣接する側縁部の間に所定の隙間が生ずるように捲回される。テープＴ１が所定の配置・形状となりやすいように、テープＴ１を所定の温度に加熱して管成形軸ＳＦＴに供給したり、予備成形ローラ（図示せず）などによって所定の形状に予備成形してから管成形軸ＳＦＴに供給したりすることが好ましい。このテープＴ１は、後に第１シール部材１２１となる。 At that time, the water-swellable nonwoven fabric tape T1 is wound spirally around the tube forming shaft SFT so that a predetermined gap is formed between adjacent side edges of the tape T1. The tape T1 is heated to a predetermined temperature and supplied to the tube forming shaft SFT so that the tape T1 is likely to have a predetermined arrangement and shape, or is pre-formed into a predetermined shape by a pre-forming roller (not shown). To the tube forming shaft SFT. This tape T1 will later become the first seal member 121.

そして、テープＴ１を覆うように半溶融状態の第１合成樹脂条帯Ｔ２が捲回され、第１合成樹脂条帯Ｔ２の隣接する両側端部を互いに重ね合わせて溶着一体化して、螺旋状凹凸条を有する波付円筒状の合成樹脂製筒を形成する。この合成樹脂製筒は、後に管継手本体部材となる部分である。本実施形態では、管継手本体部材の大径部１１１に対応する部分で第１合成樹脂条帯Ｔ２の側縁部が重ね合わせられて合成樹脂製筒の管壁が構成されているが、条帯Ｔ２を、管継手本体部材の小径部１１２に対応する部分で重ね合わせるようにしても良い。 Then, the first synthetic resin strip T2 in a semi-molten state is wound so as to cover the tape T1, and adjacent side ends of the first synthetic resin strip T2 are overlapped with each other to be welded and integrated to form spiral irregularities. A corrugated cylindrical synthetic resin tube having a strip is formed. This synthetic resin cylinder is a portion that will later become a pipe joint body member. In the present embodiment, the side wall portion of the first synthetic resin strip T2 is overlapped at the portion corresponding to the large diameter portion 111 of the pipe joint body member to constitute the tube wall of the synthetic resin tube. The band T2 may be overlapped at a portion corresponding to the small diameter portion 112 of the pipe joint body member.

テープＴ１と第１樹脂条帯Ｔ２の捲回を管成形軸２１上で連続的に行うことにより、管継手本体部材の螺旋状の大径部１１１に対応する部分の内側に沿って、吸水膨張性素材のテープＴ１が配設一体化されたような、不定長の管体が得られる。吸水膨張性素材の一体化は、接着剤や粘着材を使用して接着しても良いし、半溶融状態の合成樹脂条帯Ｔ２の有する熱量を利用して溶着しても良い。 By continuously winding the tape T1 and the first resin strip T2 on the tube forming shaft 21, the water absorption expansion is performed along the inside of the portion corresponding to the spiral large-diameter portion 111 of the pipe joint body member. An indefinite-length tubular body in which a tape T1 made of a conductive material is arranged and integrated is obtained. The water-swellable material may be integrated by using an adhesive or a pressure-sensitive adhesive, or may be welded using the heat amount of the semi-molten synthetic resin strip T2.

本実施形態では、さらに、別の樹脂の押出機から、所定の断面形状（本実施形態では矩形状）を有する第２の合成樹脂条帯Ｔ３を半溶融状態で押出成形し、管成形軸ＳＦＴ上で形成されつつある前記合成樹脂製筒の外周面に現れた凹溝の部分に、合成樹脂条帯Ｔ３を供給し、捲回する。すると、第２の合成樹脂条帯Ｔ３の両側縁部が、凹溝の側面部や肩部に溶着して、第２合成樹脂条帯Ｔ３が前記合成樹脂製筒の凹溝部分に接合一体化される。第２合成樹脂条帯Ｔ３は、螺旋状連結部材１３に対応する部分である。 In the present embodiment, the second synthetic resin strip T3 having a predetermined cross-sectional shape (in the present embodiment, a rectangular shape) is extruded from a different resin extruder in a semi-molten state, and the tube forming shaft SFT is formed. The synthetic resin strip T3 is supplied to the concave groove portion appearing on the outer peripheral surface of the synthetic resin cylinder being formed and wound. Then, both side edge portions of the second synthetic resin strip T3 are welded to the side surface portion or shoulder portion of the concave groove, and the second synthetic resin strip T3 is integrally joined to the concave groove portion of the synthetic resin cylinder. Is done. The second synthetic resin strip T3 is a part corresponding to the spiral connecting member 13.

以上の行程がスパイラル成形行程において行われることにより、管継手前駆体Ｐが得られる。管継手前駆体Ｐは、管継手１の管継手本体部材１１と第１シール部材１２１と螺旋状連結部材１３に対応する部分を備えている。 The pipe joint precursor P is obtained by performing the above process in the spiral molding process. The pipe joint precursor P includes portions corresponding to the pipe joint body member 11, the first seal member 121, and the spiral coupling member 13 of the pipe joint 1.

スパイラル成形工程に引き続いて、切断工程を行う。切断工程においては、スパイラル成形工程で得られた不定長の管継手前駆体Ｐを、カッターなどによって、所定の長さに切断する。
その後、切断工程を経て得られた部材の内側に、所定幅の吸水膨張性素材（不織布）からなるテープを、管軸方向に平行に貼り付けることによって、上記第１実施形態の管継手１を得ることができる。 Following the spiral molding process, a cutting process is performed. In the cutting step, the indefinite length pipe joint precursor P obtained in the spiral forming step is cut into a predetermined length by a cutter or the like.
Thereafter, a pipe made of a water-swellable material (nonwoven fabric) having a predetermined width is affixed in parallel to the pipe axis direction on the inner side of the member obtained through the cutting step, whereby the pipe joint 1 of the first embodiment is attached. Can be obtained.

上記製造方法によれば、管継手本体部１１を成形するのと同時に、第１シール材１２１をその内周面に螺旋状に接着一体化し、螺旋状連結部材１３をその外周面に接合一体化すると共に、そのような管継手前駆体Ｐを不定長で連続して製造でき、製造効率が非常に高い。従って、上記製造方法によれば、管継手１を効率的に製造することができる。 According to the manufacturing method, at the same time that the pipe joint body 11 is formed, the first sealing material 121 is spirally bonded and integrated on the inner peripheral surface, and the helical connecting member 13 is bonded and integrated on the outer peripheral surface. At the same time, such a pipe joint precursor P can be continuously produced with an indefinite length, and the production efficiency is very high. Therefore, according to the said manufacturing method, the pipe joint 1 can be manufactured efficiently.

なお、上記製造方法においては、スパイラル成形行程で第２合成樹脂条帯Ｔ３が接合一体化されているが、第２合成樹脂条帯Ｔ３や対応する螺旋状連結部材１３は、管継手前駆体の切断行程の後で一体化されるものであっても良い。ただ、スパイラル成形工程中で第２合成樹脂条帯Ｔ３を接合一体化すると、管継手の製造効率が特に高められる。 In the above manufacturing method, the second synthetic resin strip T3 is joined and integrated in the spiral molding process. However, the second synthetic resin strip T3 and the corresponding spiral connecting member 13 are made of a pipe joint precursor. It may be integrated after the cutting process. However, when the second synthetic resin strip T3 is joined and integrated in the spiral molding process, the manufacturing efficiency of the pipe joint is particularly improved.

上記実施形態の管継手１の作用及び効果について説明する。上記実施形態の管継手１によれば、螺旋状凹凸条を有する管継手本体部材１１の外面の凹溝部分（１１２）に、凹溝の両側を橋渡しするように、螺旋状の連結部材１３を接合一体化しているので、管継手１と螺旋状波付管２の接続部の止水性をより確実なものにできる。 The operation and effect of the pipe joint 1 of the above embodiment will be described. According to the pipe joint 1 of the said embodiment, the helical connection member 13 is connected to the concave groove part (112) of the outer surface of the pipe joint main body member 11 which has a helical uneven | corrugated strip so that both sides of a concave groove may be bridged. Since they are joined and integrated, the water stoppage of the connecting portion between the pipe joint 1 and the spiral corrugated pipe 2 can be made more reliable.

上記実施形態の管継手１により止水性がより確実なものとなる理由について説明する。
発明者の検討によれば、特許文献３に開示されたような、螺旋状凹凸条を有する管継手本体部材を有する従来の管継手においては、管路が曲がった部分で管継手が使用されて螺旋状波付管が接続される場合において、止水性の確実性が低下する傾向にあることが判明した。 The reason why the water stoppage becomes more reliable by the pipe joint 1 of the above embodiment will be described.
According to the inventor's study, in a conventional pipe joint having a pipe joint main body member having a spiral ridge as disclosed in Patent Document 3, a pipe joint is used at a portion where a pipe line is bent. When the spiral corrugated pipe is connected, it has been found that the certainty of water-stopping tendency tends to decrease.

発明者は、その理由についてさらに検討を進めた。螺旋状の凹凸条を有する管継手本体部材によって螺旋状波付管の接続を行った場合、従来の管継手においては、螺旋状波付管と螺合している部分では、管継手本体部材の螺旋状凹凸条は波付管の凹凸条と噛み合っていてあまり伸縮しないのに対し、管継手本体部材の中央部のように、螺旋状波付管と噛み合っていないあるいは噛み合いが不十分な部分では、螺旋状凹凸条の部分がジャバラのように伸縮しうる部分となる。そのため、従来の管継手においては、管継手の両端部では、螺旋状波付管が挿入され螺合されて、管継手本体部材の伸縮変形が抑制されるのに対し、管継手の中央部では、管継手本体部材の伸縮変形があまり抑制されないことになる。 The inventor further investigated the reason. When a spiral corrugated pipe is connected by a pipe joint body member having a spiral ridge, in a conventional pipe joint, in a portion screwed with the spiral corrugated pipe, The spiral ridges mesh with the undulations of the corrugated tube and do not expand or contract very much, but in the parts that are not meshed with the spiral corrugated tube or insufficiently engaged, such as the center of the pipe joint body member. The portion of the spiral irregularities becomes a portion that can expand and contract like a bellows. Therefore, in the conventional pipe joint, the spiral corrugated pipe is inserted and screwed at both ends of the pipe joint, so that the expansion and contraction deformation of the pipe joint body member is suppressed. The expansion / contraction deformation of the pipe joint main body member is not so suppressed.

管継手の中央部に局所的に管継手本体部材の伸縮が抑制されていない部分が存在すると、管継手本体部材の凹凸条が螺旋状に設けられているため、中央部における伸縮が、管継手の周方向に均一に生ずるのではなく、周方向の一部の領域において偏在して生ずることになる。 If there is a portion where the expansion and contraction of the pipe joint body member is not locally suppressed in the center part of the pipe joint, the projections and recesses of the pipe joint body member are provided in a spiral shape. However, it is unevenly distributed in a partial region in the circumferential direction.

すると、従来の管継手により螺旋状波付管が接続された部分に、曲げ変位や曲げの力が加えられると、周方向に偏在した一部の領域のみが管軸方向の伸縮を許容されるようになって、管継手本体部材の伸縮が周方向に偏りを生じたものとなってしまう。すると、本来円筒状に形成された管継手本体部材の断面形状がゆがんで、管継手本体部材と螺旋状波付管の間の隙間寸法が周方向にばらつきやすくなる。
発明者の推察によれば、従来の管継手では、このような管継手本体部材のゆがみにより、管路が曲げ配置される部分において、止水性の確実さが低下するものと考えられる。 Then, when bending displacement or bending force is applied to the portion where the spiral corrugated pipe is connected by the conventional pipe joint, only a partial area unevenly distributed in the circumferential direction is allowed to expand and contract in the pipe axis direction. As a result, the expansion and contraction of the pipe joint main body member is biased in the circumferential direction. Then, the cross-sectional shape of the pipe joint body member that is originally formed in a cylindrical shape is distorted, and the gap dimension between the pipe joint body member and the spiral corrugated pipe is likely to vary in the circumferential direction.
According to the inventor's guess, in the conventional pipe joint, due to the distortion of the pipe joint body member, it is considered that the certainty of water stoppage is lowered in the portion where the pipe line is bent.

これに対し、上記第１実施形態の管継手１によれば、螺旋状凹凸条を有する管継手本体部材１１の外面の凹溝部分（１１２）に、凹溝の両側を橋渡しするように、螺旋状の連結部材１３を接合一体化しているので、管継手本体部材の凹溝の部分の伸縮変形が螺旋状連結部材の働きによって抑制される。従って、上記第１実施形態の管継手１では、管継手１に曲げの力やモーメントが作用しても、螺旋状凹凸条や凹溝部分がほとんど伸縮せず、従って、管継手の周方向の一部に伸縮が大きな部分が偏って生じることも無くなる。 On the other hand, according to the pipe joint 1 of the said 1st Embodiment, it spirals so that the both sides of a ditch | groove may be bridged to the ditch | groove part (112) of the outer surface of the pipe joint main body member 11 which has a spiral uneven | corrugated strip. Since the connecting member 13 is joined and integrated, expansion and contraction of the concave groove portion of the pipe joint body member is suppressed by the action of the spiral connecting member. Therefore, in the pipe joint 1 according to the first embodiment, even if a bending force or moment acts on the pipe joint 1, the spiral ridges and grooves are hardly expanded and contracted. There is no possibility that a part with large expansion and contraction is biased.

従って、上記第１実施形態の管継手１によれば、管継手本体部材１１の断面形状がゆがんでしまうことが抑制され、管継手本体部材１１と螺旋状波付管２の間の隙間寸法に周方向のばらつきが生じにくい。従って、上記第１実施形態の管継手１によれば、管継手の止水性をより確実なものにできる。 Therefore, according to the pipe joint 1 of the said 1st Embodiment, it is suppressed that the cross-sectional shape of the pipe joint main body member 11 is distorted, and the clearance gap dimension between the pipe joint main body member 11 and the spiral corrugated pipe 2 is made. Less variation in the circumferential direction. Therefore, according to the pipe joint 1 of the said 1st Embodiment, the water stop of a pipe joint can be made more reliable.

止水性をより確実なものとする観点からは、螺旋状連結部材１３を、凹溝の両側の肩部１１５，１１５同士を橋渡しするように配設し、接合一体化することが好ましく、このようにすれば、管継手本体部材１１の凹溝の部分が管軸方向に伸縮することを確実に抑止できて、止水をより確実なものと出来る。また、同じ理由により、螺旋状連結部材１３を、凹溝の両側の側面部１１４，１１４同士を橋渡しするように配設し、接合一体化する場合であっても、なるべく肩部１１５，１１５に近い位置に螺旋状連結部１３を接合することが好ましい。 From the viewpoint of ensuring the water-stopping property, it is preferable that the helical connecting member 13 is disposed so as to bridge the shoulder portions 115 on both sides of the concave groove, and is integrally joined. If it does, it can suppress reliably that the part of the ditch | groove of the pipe joint main body member 11 expands / contracts in a pipe-axis direction, and can make water stop more reliable. For the same reason, even when the spiral connecting member 13 is disposed so as to bridge the side portions 114 and 114 on both sides of the groove and is joined and integrated, the shoulder portions 115 and 115 are connected as much as possible. It is preferable to join the helical connecting portion 13 at a close position.

発明者は、呼び径φ５０ｍｍの螺旋状波付管２に対応する上記第１実施形態の管継手１を作成し、止水試験を行った。止水試験は、一対の螺旋状波付管２，２を管継手１にねじ込んで螺合接続したものに、曲げ半径が約２５ｃｍとなるような曲げを与え、管継手の部分を水没させて０．５気圧に相当する水圧を加え、５分後の管路内への水の浸入状況を確認して行なった。 The inventor created the pipe joint 1 of the first embodiment corresponding to the spiral corrugated pipe 2 having a nominal diameter of φ50 mm, and performed a water stop test. In the water stop test, a pair of spiral corrugated pipes 2 and 2 are screwed into the pipe joint 1 and screwed together to bend so that the bending radius is about 25 cm, and the pipe joint portion is submerged. Water pressure corresponding to 0.5 atm was applied, and the state of water intrusion into the pipeline after 5 minutes was confirmed.

上記第１実施形態の管継手１によれば、１０個のサンプルで試験を行ったが、管路内に水が浸入したものは無かった。比較例として、螺旋状連結部材がない点を除けば上記第１実施形態の管継手と同様の仕様を有する管継手を製作し、対比試験を行った。比較例によれば、１０個のサンプルで試験を行ったところ、２つのサンプルで、管継手の内側に水がにじみ出ていることが確認された。上記第１実施形態の管継手１が、管路が曲がった部分においても止水性の確実さを有していることが確認された。 According to the pipe joint 1 of the said 1st Embodiment, although the test was done with ten samples, there was no thing which water infiltrated into the pipe line. As a comparative example, a pipe joint having the same specifications as the pipe joint of the first embodiment except that there is no spiral connecting member was manufactured, and a comparison test was performed. According to the comparative example, when 10 samples were tested, it was confirmed that water oozed out of the pipe joint in two samples. It was confirmed that the pipe joint 1 according to the first embodiment has certainty of water stoppage even at a portion where the pipe line is bent.

本発明は、上記実施形態に限定されるものではなく、種々の改変を加えて実施することができる。以下に本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 present invention is not limited to the above embodiment, and can be implemented with various modifications. Other embodiments of the present invention will be described below. However, in the following description, portions different from the above embodiment will be mainly described, and detailed descriptions of the same portions will be omitted. Moreover, these embodiments can be implemented by combining some of them or replacing some of them.

図４には、発明の第２実施形態の管継手４を一部断面図で示す。管継手本体部材４１や第１シール部材４２１の形態は、第１実施形態と同様であるが、本実施形態では、螺旋状連結部材４３や第２シール部材４２２の形態が変更されている。
本実施形態においては、螺旋状連結部材４３は、管継手本体部材４１の外面に現れる凹溝の両側の肩部４１３と肩部４１３の間を橋渡しするように、管継手本体部材４１の最外周面に被着される形態で設けられている。 In FIG. 4, the pipe joint 4 of 2nd Embodiment of invention is shown with a partial cross section figure. The form of the pipe joint main body member 41 and the first seal member 421 is the same as that of the first embodiment, but in this embodiment, the form of the spiral connecting member 43 and the second seal member 422 is changed.
In the present embodiment, the spiral coupling member 43 is formed on the outermost periphery of the pipe joint body member 41 so as to bridge between the shoulder parts 413 on both sides of the groove that appears on the outer surface of the pipe joint body member 41. It is provided in a form that is attached to the surface.

このように、螺旋状連結部材は、凹溝の両側部を互いに連結するものであればよく、凹溝の側面部に接合されるものであっても、凹溝の肩部に接合されるものであっても良い。管継手本体部材の局所変形を防止し、止水性の確実性を向上させる観点からは、凹溝の肩部同士を螺旋状連結部材で接続することが好ましい。また、螺旋状連結部材の断面形状は特に限定されるものではなく、矩形状、楕円形状、円形状などの形態であっても良いが、管継手本体部材の局所変形を防止し、止水性の確実性を向上させる観点からは、管継手本体部材と螺旋状連結部材とが接合される部分の間を直線的につなぐような断面形状（例えば、矩形状）であることが好ましい。 Thus, the spiral connecting member only needs to connect both side portions of the concave groove to each other, and even if it is bonded to the side surface portion of the concave groove, it is bonded to the shoulder portion of the concave groove. It may be. From the viewpoint of preventing local deformation of the pipe joint body member and improving the certainty of water-stopping properties, it is preferable to connect the shoulder portions of the concave groove with a spiral connecting member. Further, the cross-sectional shape of the spiral connecting member is not particularly limited, and may be a rectangular shape, an elliptical shape, a circular shape, etc. From the viewpoint of improving the certainty, it is preferable that the cross-sectional shape (for example, a rectangular shape) connects the portions where the pipe joint body member and the helical connection member are joined linearly.

また、本実施形態においても、螺旋状連結部材４３と管継手本体部材４１の接合は、凹溝に沿って連続して接合されている。この接合は、断続的なものであっても良いが、管継手本体部材の局所変形を防止し、止水性の確実性を向上させる観点からは、凹溝に沿って連続して接合されることが好ましい。 Also in the present embodiment, the helical connection member 43 and the pipe joint body member 41 are joined continuously along the concave groove. This joining may be intermittent, but from the viewpoint of preventing local deformation of the pipe joint body member and improving the certainty of water-stopping, it is continuously joined along the concave groove. Is preferred.

管継手に備えられるシール材の形態も変更が可能である。第２実施形態においては、第１シール部材４２１は螺旋状に設けられており、第２シール部材４２２は、第１シール部材４２１の離間した部分をまたぐように、部分的に設けられている。このような形態であっても、閉じたシールラインが形成されて、接続部分のシールがなされうる。また、第２シール部材は、第１シール部材の離間部をまたぐように、管継手本体部材の螺旋状凹凸条に沿って、螺旋状に１周ないし２周する形態に設けられていても良い。 The form of the sealing material provided in the pipe joint can also be changed. In the second embodiment, the first seal member 421 is provided in a spiral shape, and the second seal member 422 is partially provided so as to straddle the spaced apart portion of the first seal member 421. Even in such a configuration, a closed seal line can be formed to seal the connection portion. In addition, the second seal member may be provided in a form that spirals once or twice along the spiral irregularities of the pipe joint body member so as to straddle the separation portion of the first seal member. .

シールが効果的になされる限りにおいて、シール材の配設形態は種々の形態が採用できる。シール材は、例えば、管継手本体部材の内周面全体を覆うような円筒状の配設形態や、リング状のシール材を管継手本体部材の両端部の内周面に設けるような配設形態や、吸水膨張性不織布を密接させて螺旋状に捲回して管継手本体部材の内周面全体を覆うような円筒状に配設した形態としても良い。 As long as the sealing is effectively performed, various forms of the sealing material can be adopted. The sealing material is, for example, a cylindrical arrangement form that covers the entire inner peripheral surface of the pipe joint body member, or an arrangement in which ring-shaped sealing materials are provided on the inner peripheral surfaces of both ends of the pipe joint body member. It is good also as a form arrange | positioned in the cylindrical form which close | sucks a form or a water absorptive expandable nonwoven fabric, and winds spirally and covers the whole internal peripheral surface of a pipe joint main body member.

また、上記実施形態の管継手は、スパイラル成形法を応用した製造方法により効率的に製造できるが、それ以外の製造方法によっても製造できる。 Moreover, although the pipe joint of the said embodiment can be efficiently manufactured with the manufacturing method which applied the spiral molding method, it can be manufactured also with the other manufacturing method.

例えば、管継手本体部材は、樹脂の射出成形によって製造しても良い。また、シール材と管継手本体部材の一体化は、管継手本体部材の成形工程と同時に（例えばインサート射出成形や、上記スパイラル成形により）行なっても良いし、完成した管継手本体部材に後工程でシール材を一体化するようにしても良い。また、螺旋状連結部材は、管継手本体部材の成形工程と同時に（例えば上記スパイラル成形により）行なっても良いし、完成した管継手本体部材に後工程で螺旋状連結部材を接合一体化するようにしても良い。後工程で螺旋状連結部材を設ける方法としては、例えば、管継手本体部材の凹溝部分の肩部に半溶融状態のホットメルト接着剤をひも状に供給して、凹溝部分の肩部同士を接続する方法などが例示できる。 For example, the pipe joint body member may be manufactured by resin injection molding. Further, the integration of the seal material and the pipe joint body member may be performed simultaneously with the molding process of the pipe joint body member (for example, by insert injection molding or spiral molding), or the completed pipe joint body member is subjected to a post-process. The sealing material may be integrated. Further, the spiral connecting member may be performed simultaneously with the forming process of the pipe joint main body member (for example, by the above spiral forming), or the spiral connecting member is joined and integrated to the completed pipe joint main body member in the subsequent process. Anyway. As a method of providing the spiral connecting member in the subsequent process, for example, a hot melt adhesive in a semi-molten state is supplied in a string shape to the shoulders of the recessed groove portions of the pipe joint body member, and the shoulder portions of the recessed groove portions are Examples of such a method are as follows.

管継手を効率的に製造するという観点からは、管継手の管継手本体部材が、樹脂の押出装置から所定の断面に押出された半溶融状態の合成樹脂条帯を螺旋状に捲回して、隣接する合成樹脂条帯の両側端部を互いに溶着一体化して波付円筒状に形成されたものであり、シール材が、管継手全長にわたって螺旋状に連続して配設されたシール部材を含むものであることが好ましい。このような管継手であれば、管継手本体部材と螺旋状のシール部材とをスパイラル成形法を応用して効率的に製造することができる。 From the viewpoint of efficiently producing a pipe joint, the pipe joint body member of the pipe joint is spirally wound around a synthetic resin strip in a semi-molten state extruded into a predetermined cross section from a resin extrusion device, Both end portions of adjacent synthetic resin strips are welded and integrated with each other to form a corrugated cylindrical shape, and the sealing material includes a sealing member continuously disposed in a spiral shape over the entire length of the pipe joint. It is preferable. With such a pipe joint, the pipe joint body member and the spiral seal member can be efficiently manufactured by applying the spiral molding method.

また、さらに、螺旋状連結部材が、溶着により、管継手本体部材に接合一体化されるものであれば、螺旋状連結部材もスパイラル工程中で接合一体化できて、製造の効率性がより高められて、好ましい。なお、管継手本体部材の製造にスパイラル成形工程を応用する場合であっても、螺旋状連結部材やシール材を必ずスパイラル成形工程で製造しなければならないわけではない。 Furthermore, if the spiral connecting member is joined and integrated with the pipe joint body member by welding, the spiral connecting member can also be joined and integrated in the spiral process, so that the manufacturing efficiency is further improved. And preferred. Even when the spiral molding process is applied to the manufacture of the pipe joint main body member, the spiral connecting member and the sealing material are not necessarily manufactured by the spiral molding process.

上記説明では、ケーブル保護用途に使用される地中埋設管（螺旋状波付管）の管継手を中心に説明したが、管継手の応用分野は、これに限定されるものではなく、螺旋状波付管の接続において広く使用できる。例えば、上記実施形態の管継手は、螺旋状波付形態を有するＰＣケーブルシースの接続部分や、地上に配設される螺旋状波付形態を有するケーブル保護管の接続部分に使用することができる。 In the above description, the description has been made centering on the pipe joints of underground buried pipes (spiral corrugated pipes) used for cable protection, but the application field of pipe joints is not limited to this. Can be widely used in corrugated tube connection. For example, the pipe joint of the above embodiment can be used for a connection portion of a PC cable sheath having a spiral wavy form or a connection portion of a cable protection tube having a spiral wavy form disposed on the ground. .

本発明の管継手は、例えば螺旋状波付形態を有する地中埋設管（ケーブル保護管）に使用でき、産業上の利用価値が高い。 The pipe joint of the present invention can be used, for example, in underground pipes (cable protection pipes) having a spiral corrugated form, and has high industrial utility value.

１管継手
１１管継手本体部材
１１１大径部
１１２小径部（凹溝）
１１３凹溝底部
１１４凹溝側面部
１１５凹溝肩部
１２シール材
１２１第１シール部材
１２２第２シール部材
１３螺旋状連結部材
２螺旋状波付管
ＳＦＴ管製造装置の成形軸
Ｔ１吸水膨張性不織布の条帯
Ｔ２第１合成樹脂条帯
Ｔ３第２合成樹脂条帯
Ｐ管継手前駆体
４管継手
４１管継手本体部材
４２シール材
４２１第１シール部材
４２２第２シール部材
４３螺旋状連結部材 1 Pipe fitting 11 Pipe fitting body member 111 Large diameter portion 112 Small diameter portion (concave groove)
113 concave groove bottom 114 concave groove side surface 115 concave groove shoulder 12 seal material 121 first seal member 122 second seal member 13 spiral connecting member 2 spiral corrugated tube SFT forming axis T1 of water-swellable non-woven fabric Strip T2 First synthetic resin strip T3 Second synthetic resin strip P Pipe joint precursor 4 Pipe joint 41 Pipe joint body member 42 Seal material 421 First seal member 422 Second seal member 43 Spiral connecting member

Claims

螺旋状波付管に螺合させて接続可能であり、略円筒状の管継手本体部材の内周面に、接続すべき螺旋状波付管の外周面と対向するようにシール材を一体化した管継手であって、
前記管継手本体部材は、螺旋状凹凸条を有する波付円筒状に形成されており、
シール材は、吸水膨張性素材からなるシール材であるとともに、
前記螺旋状凹凸条に対応して管継手本体部材外面に現れる凹溝には、凹溝に沿って、螺旋状連結部材が配設されており、
前記螺旋状連結部材によって、管継手本体部材の凹溝の側面部もしくは凹溝に隣接する肩部が、凹溝底部をまたいで橋渡しされるように、螺旋状連結部材が管継手本体部材に接合一体化された
管継手。 It can be connected by screwing into a spiral corrugated pipe, and a seal material is integrated with the inner peripheral surface of the substantially cylindrical pipe joint body member so as to face the outer peripheral surface of the spiral corrugated pipe to be connected Pipe fittings,
The pipe fitting main body member is formed in a corrugated cylindrical shape having a helical ridge,
The sealing material is a sealing material made of a water-swellable material,
In the concave groove appearing on the outer surface of the pipe joint main body member corresponding to the spiral concave and convex strips, a spiral connecting member is disposed along the concave groove,
The spiral coupling member is joined to the pipe joint body member by the spiral coupling member so that the side surface of the groove of the pipe joint body member or the shoulder adjacent to the groove is bridged across the bottom of the groove. Integrated pipe joint.

螺旋状連結部材が、溶着により、管継手本体部材に接合一体化された請求項１に記載の管継手。 The pipe joint according to claim 1 , wherein the spiral connecting member is joined and integrated with the pipe joint main body member by welding.

請求項２に記載された管継手を製造する方法であって、
管継手の製造方法は、スパイラル成形法により中空管状の管継手前駆体を連続成形するスパイラル成形工程と、形成された管継手前駆体を所定の長さに切断する切断工程と、を含み、
前記スパイラル成形工程において、
樹脂の押出装置から第１の合成樹脂条帯を所定の断面に半溶融状態で押出して、管の成形装置の成形軸に供給し、螺旋状に捲回して、隣接する合成樹脂条帯の両側端部を互いに溶着一体化して、後に管継手本体部材となるべき螺旋状凹凸条を有する波付円筒状の合成樹脂筒を形成すると共に、
吸水膨張性素材からなる所定幅の条帯を、第１合成樹脂条帯の内側となるように前記成形軸に供給し、螺旋状に捲回して、前記合成樹脂筒の内側に配設一体化し、
さらに、樹脂の押出装置から第２の合成樹脂条帯を所定の断面に半溶融状態で押出して、前記波付円筒状合成樹脂筒の外面に現れる螺旋状の凹溝の部分に供給し、第２の合成樹脂条帯を前記波付円筒状合成樹脂筒の螺旋状凹溝の部分に溶着させ、
前記切断工程において、
管継手前駆体を所定の長さに切断して、前記合成樹脂筒を管継手本体部材とする
ことを特徴とする管継手の製造方法。 A method for manufacturing a pipe joint according to claim 2 , comprising:
The method for manufacturing a pipe joint includes a spiral molding step of continuously forming a hollow tubular pipe joint precursor by a spiral molding method, and a cutting step of cutting the formed pipe joint precursor into a predetermined length.
In the spiral molding process,
A first synthetic resin strip is extruded from a resin extrusion device into a predetermined cross section in a semi-molten state, supplied to a forming shaft of a tube forming device, wound in a spiral shape, and both sides of adjacent synthetic resin strips The end portions are welded and integrated with each other to form a corrugated cylindrical synthetic resin tube having a spiral ridge to be a pipe joint body member later,
A strip having a predetermined width made of a water-swellable material is supplied to the molding shaft so as to be inside the first synthetic resin strip, wound in a spiral shape, and arranged and integrated inside the synthetic resin tube. ,
Further, the second synthetic resin strip is extruded from the resin extrusion device in a semi-molten state to a predetermined cross section, and is supplied to the spiral groove portion that appears on the outer surface of the corrugated cylindrical synthetic resin cylinder. 2 is welded to the spiral groove portion of the corrugated cylindrical synthetic resin cylinder,
In the cutting step,
A pipe joint manufacturing method, wherein a pipe joint precursor is cut into a predetermined length, and the synthetic resin cylinder is used as a pipe joint body member.