JPH08312843A - Repairing pipe for existing piping and repairing method using such pipe - Google Patents
Repairing pipe for existing piping and repairing method using such pipeInfo
- Publication number
- JPH08312843A JPH08312843A JP7145351A JP14535195A JPH08312843A JP H08312843 A JPH08312843 A JP H08312843A JP 7145351 A JP7145351 A JP 7145351A JP 14535195 A JP14535195 A JP 14535195A JP H08312843 A JPH08312843 A JP H08312843A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- repair
- existing pipe
- existing
- repairing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Pipe Accessories (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、地下に埋設されている
ガス配管、水道配管などの既設配管の補修用パイプおよ
びその補修用パイプを用いて既設配管を埋設したまま補
修する方法に関するものであり、特に屈曲部が多数存在
する既設配管の補修に適用し得る補修用パイプおよびそ
れを用いる補修方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair pipe for an existing pipe such as a gas pipe or a water pipe buried underground, and a method for repairing an existing pipe by using the repair pipe. In particular, the present invention relates to a repair pipe applicable to repair an existing pipe having many bent portions and a repair method using the repair pipe.
【０００２】[0002]
【従来の技術】一般に、地下に埋設されているガス配
管、水道配管などの既設配管は、長期にわたり使用する
うちに、管の腐食や継手部の緩みなどが生じて漏洩が起
こり、その漏洩予防や保全のために補修が必要となる。
昨今は、交通量の増大や工期の短縮など種々の理由によ
り、これらの埋設配管を埋設したままの状態で更生修理
することが行われている。このような場合の一般的な工
法としては、古くからパイプリバース法がよく知られて
いる。この工法によれば、筒状の織布または不織布等の
繊維質補強体を芯材とし、外面をゴムまたは合成樹脂で
被覆し、内面に反応性硬化型接着剤を塗布した柔軟な筒
状の内張り材を、流体圧力などにより反転させて裏返し
ながら管路内に挿通し、反転した内張り材を上記流体圧
力の作用で管路内面に圧着し、必要により拡張用プラグ
等を通過させて、反応性硬化型接着剤を介し既設配管内
面に接着して内張りとする（特公平７−２２７３６号か
ら特公平７−２２７３９号公報他）。しかしながら、こ
の工法では、屈曲部が多数存在する既設配管や狭い管路
を有する既設配管の場合には、内張り材が円滑に反転せ
ず、しばしば工事の中断を余儀なくされるという欠点を
有している。2. Description of the Related Art Generally, existing pipes such as gas pipes and water pipes underground are leaked due to corrosion of pipes and loosening of joints during long-term use. Repair is necessary for maintenance.
Recently, for a variety of reasons such as an increase in traffic volume and a shortened construction period, rehabilitation repair is being performed with these buried pipes being buried. As a general construction method in such a case, the pipe reverse method has long been well known. According to this method, a fibrous reinforcing material such as a tubular woven fabric or a non-woven fabric is used as a core material, the outer surface is covered with rubber or a synthetic resin, and the inner surface is coated with a reactive curable adhesive to form a flexible tubular material. Insert the lining material into the pipe line by inverting it with fluid pressure and turning it inside out, crimp the inverted lining material to the inner surface of the pipe line by the action of the above fluid pressure, and pass the expansion plug etc. as necessary to react. It is adhered to the inner surface of the existing pipe via a thermosetting adhesive to form a lining (Japanese Patent Publication No. 7-22736 to Japanese Patent Publication No. 7-22739). However, with this construction method, in the case of existing piping having many bent portions or existing piping having a narrow pipeline, there is a drawback that the lining material does not invert smoothly and the construction is often interrupted. There is.
【０００３】また、特開昭６３−１６２２２１号公報に
は、既設配管より口径の小さい熱可塑性樹脂製管体を既
設配管内に挿入した後、管体を加熱して軟化させつつ管
体内部に拡張用プラグを通過させ、同時に加圧流体によ
り管体を既設配管内面に圧着する方法が開示されてい
る。また、特開昭６３−２０３３１６号公報には、既設
配管の内径とほぼ同じ外径を有し、かつ保形性のある熱
可塑性樹脂製の内張り管を、外径を減小させるように変
形して既設配管内に挿入し、次いで内張り管の内面側か
ら加熱および加圧を行って元の形状に復元する方法が開
示されている。しかしながら、前者においては、挿入す
る管体の可撓性が十分でないため、挿入後にプラグを用
いて拡管を行っており、煩雑な工程を要するものであ
る。また、後者の場合には、既設配管が長く、かつ屈曲
部が多数存在するとき、パイプを強制的に牽引挿入する
ためにパイプの破損や亀裂が生じ施工不能となる。Further, in Japanese Patent Laid-Open No. 63-162221, a thermoplastic resin pipe having a smaller diameter than that of an existing pipe is inserted into the existing pipe, and then the pipe is heated to soften the inside of the pipe. A method is disclosed in which a pipe is passed through an expansion plug, and at the same time, a pipe is pressed against an inner surface of an existing pipe by a pressurized fluid. Further, in Japanese Patent Laid-Open No. 63-203316, a lining pipe made of a thermoplastic resin having an outer diameter substantially the same as the inner diameter of an existing pipe and having shape retention is modified so as to reduce the outer diameter. Then, the method of inserting into the existing pipe and then heating and pressurizing from the inner surface side of the lining pipe to restore the original shape is disclosed. However, in the former case, since the flexibility of the tube body to be inserted is not sufficient, the plug is used to expand the tube after the insertion, which requires a complicated process. In the latter case, when the existing pipe is long and there are a large number of bent portions, the pipe is forcibly pulled and inserted, so that the pipe is damaged or cracked, which makes the construction impossible.
【０００４】一方、特開平２−２０２４３１号公報に
は、常温で十分な保形性を有する硬質の合成樹脂管の周
壁に、部分的に軸線方向に沿って１ないし複数条の抗張
性補強条が埋設された管体を用い、内部に高温流体を導
入することによって加熱軟化させながら一端を牽引して
既設管内へ挿入する方法が開示されている。しかしなが
らこの方法では、管体を挿入するときに、内部に高温流
体を導入して加熱軟化させる工程が必要であり、非常に
煩雑な工程であるためコストが高く、かつ温度調整が困
難であり、さらに高温流体の取扱い等の安全性の問題や
加熱軟化した管体が固化する前に迅速に挿入等の施工を
完了しなければならないなどの種々の問題点を有してい
る。以上のように、屈曲部を多数有する既設配管に対し
て、破損や切断などを起こすことなく容易に挿入するこ
とができ、かつ既設配管の内壁へ良好に密着させること
ができる補修用パイプおよびそのパイプを用いる既設配
管の補修方法について改良が望まれている。On the other hand, in Japanese Patent Laid-Open No. 202243/1990, one or a plurality of tensile strength reinforcements are partially provided along the axial direction on the peripheral wall of a hard synthetic resin pipe having sufficient shape retention at room temperature. There is disclosed a method in which a pipe body in which a strip is embedded is introduced into a preexisting pipe by pulling one end while heating and softening it by introducing a high temperature fluid into the pipe body. However, in this method, when inserting the tubular body, a step of introducing a high temperature fluid to heat and soften it is necessary, and the cost is high because it is a very complicated step, and temperature adjustment is difficult, Further, there are various problems such as safety problems such as handling of high-temperature fluids and the need to promptly complete construction such as insertion before the heat-softened pipe body is solidified. As described above, a repair pipe that can be easily inserted into an existing pipe having a large number of bent portions without causing damage or cutting, and can be closely adhered to the inner wall of the existing pipe, and its repair pipe It is desired to improve the method of repairing existing pipes using pipes.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上記のよう
な事情に鑑み、屈曲部を多数有する既設配管を埋設した
まま修復するに際し、補修用パイプの牽引などによる伸
びや破断を防いで既設配管内への円滑な挿入を可能に
し、また挿入後における補修用パイプの既設配管内壁へ
の密着を良好にすることにより、補修工事の迅速化とコ
ストの低減を図ることを目的とするものである。SUMMARY OF THE INVENTION In view of the above circumstances, the present invention prevents the extension or breakage due to the pulling of a repair pipe when repairing an existing pipe having a large number of bent portions while it is buried. The purpose of this is to enable smooth insertion into the pipe and to improve the adhesion of the repair pipe to the inner wall of the existing pipe after insertion to speed up repair work and reduce costs. is there.
【０００６】[0006]
【問題を解決するための手段】本発明者らは、上記の目
的に沿って鋭意検討を行った結果、パイプの材料として
特定の樹脂を用い、かつパイプの周壁に軸方向と平行に
補強条材を埋設してパイプの引張強度を補強し、牽引時
の伸びを防止することにより上記の目的を達成し得るこ
とを見出して本発明を完成した。すなわち、本願の第１
発明は、常温で可撓性を有する熱可塑性樹脂からなるパ
イプの周壁に軸方向と平行に少なくとも１本の補強条材
が埋設されたことを特徴とする既設配管の補修用パイプ
に関するものである。本願の第２発明は、屈曲部が複数
箇所存在する既設配管を補修するにあたり、常温で可撓
性を有する熱可塑性樹脂からなるパイプの周壁に軸方向
と平行に少なくとも１本の補強条材を埋設してなる補修
用パイプを、断面の最大差渡しが既設配管の内径より小
さくなるように変形して既設配管の一端開口部から挿入
し、既設配管の他端開口部側から牽引して挿通した後、
該補修用パイプを内面側から加圧して断面形状を復元し
かつ既設配管の内面に密着させることを特徴とする既設
配管の補修方法に関するものである。Means for Solving the Problems As a result of intensive studies in view of the above-mentioned objects, the inventors of the present invention have used a specific resin as the material of the pipe and have a reinforcing strip parallel to the axial direction on the peripheral wall of the pipe. The present invention has been completed by finding that the above object can be achieved by embedding a material to reinforce the tensile strength of the pipe and preventing elongation during traction. That is, the first of the present application
The present invention relates to a repair pipe for an existing pipe, wherein at least one reinforcing strip is embedded in a peripheral wall of the pipe made of a thermoplastic resin having flexibility at room temperature in parallel with the axial direction. . A second invention of the present application is, when repairing an existing pipe having a plurality of bent portions, at least one reinforcing strip is provided in parallel with an axial direction on a peripheral wall of a pipe made of a thermoplastic resin having flexibility at room temperature. Deform the buried repair pipe so that the maximum cross-section cross section is smaller than the inner diameter of the existing pipe, insert it from one end opening of the existing pipe, and pull by inserting it from the other end opening side of the existing pipe. After doing
The present invention relates to a method for repairing an existing pipe, wherein the repair pipe is pressed from the inner surface side to restore the cross-sectional shape and to be in close contact with the inner surface of the existing pipe.
【０００７】[0007]
【作用】本発明の補修用パイプは、常温で可撓性を有す
る材料を使用し、かつパイプ周壁に軸方向と平行に補強
条材を埋設したことにより、牽引等により伸びや破断を
生ずることがなく、既設配管内へ円滑に挿入することが
可能であり、また挿入後には既設配管内壁へ容易に密着
させることができる。The repairing pipe of the present invention uses a flexible material at room temperature and has a reinforcing strip embedded in the peripheral wall of the pipe in parallel with the axial direction, so that it may be stretched or broken by pulling or the like. It can be smoothly inserted into the existing pipe, and can be easily adhered to the inner wall of the existing pipe after the insertion.
【０００８】本発明の補修用パイプとは、常温で可撓性
を有する熱可塑性樹脂からなり、パイプの周壁に軸方向
と平行に少なくとも１本の補強条材が埋設されたことを
特徴とするものであり、常温で可撓性を有する熱可塑性
樹脂としては、ポリオレフィン、ポリアミド、ポリエス
テル、ポリ塩化ビニル、熱可塑性樹脂エラストマー等が
挙げられる。The repair pipe of the present invention is characterized in that it is made of a thermoplastic resin having flexibility at room temperature, and at least one reinforcing strip is embedded in the peripheral wall of the pipe in parallel with the axial direction. Examples of the thermoplastic resin having flexibility at room temperature include polyolefin, polyamide, polyester, polyvinyl chloride, and thermoplastic resin elastomer.
【０００９】上記ポリオレフィンとしては、超低密度ポ
リエチレン、線状低密度ポリエチレン、ポリプロピレ
ン、プロピレン−エチレン共重合体、ポリ１−ブテン等
のα−オレフィンの単独重合体またはα−オレフィン相
互の共重合体；エチレン−プロピレン共重合体ゴム、エ
チレン−プロピレン−ジエン共重合体ゴム等のα−オレ
フィン相互の共重合体ゴム；低密度ポリエチレン、エチ
レン−酢酸ビニル共重合体、エチレン−アクリル酸エチ
ル共重合体等の高圧ラジカル重合による単独重合体また
はエチレンと極性基含有コモノマーとの共重合体等が挙
げられる。また、熱可塑性樹脂エラストマーとしては、
スチレン系、塩化ビニル系、オレフィン系、ポリエステ
ル系、ポリアミド系、ウレタン系等のエラストマーが挙
げられる。これらの内、特に可撓性に優れた超低密度ポ
リエチレン、低密度ポリエチレン、エチレン−酢酸ビニ
ル共重合体、エチレン−アクリル酸エチル共重合体、エ
チレン−プロピレン共重合体ゴム、エチレン−プロピレ
ン−ジエン共重合体ゴムおよび熱可塑性樹脂エラストマ
ー等が好ましい。なお、これらの熱可塑性樹脂は、単独
で用いてもよいし、２種以上の組成物として用いてもよ
い。Examples of the above-mentioned polyolefin include ultra-low density polyethylene, linear low density polyethylene, polypropylene, propylene-ethylene copolymer, poly-1-butene and other α-olefin homopolymers or α-olefin mutual copolymers. Ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber and other α-olefin copolymer rubbers; low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer And a copolymer of ethylene and a polar group-containing comonomer. Further, as the thermoplastic resin elastomer,
Examples thereof include styrene type, vinyl chloride type, olefin type, polyester type, polyamide type and urethane type elastomers. Among these, ultra-low density polyethylene, low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-propylene copolymer rubber, ethylene-propylene-diene, which are particularly excellent in flexibility. Copolymer rubbers and thermoplastic resin elastomers are preferred. In addition, these thermoplastic resins may be used alone or may be used as a composition of two or more kinds.
【００１０】本発明において、熱可塑性樹脂の可撓性の
目安としては曲げこわさが用いられる。すなわち、曲げ
こわさは２００〜５,０００kgf/cm2、好ましくは３００
〜１,２００kgf/cm2の範囲とする。熱可塑性樹脂の曲げ
こわさが２００kgf/cm2未満では柔らかすぎて機械的強
度に劣るため、パイプを牽引して既設配管内へ敷設挿入
する際に切断や破断の起こる可能性があり、信頼性に欠
けるものとなる。一方、５,０００kgf/cm2を超えるもの
は可撓性が不十分であるため、屈曲部を多数有する既設
配管内へ常温でパイプを変形させて牽引挿入することが
困難である。In the present invention, bending stiffness is used as a measure of the flexibility of the thermoplastic resin. That is, the bending stiffness is 200 to 5,000 kgf / cm 2 , preferably 300.
The range is up to 1,200 kgf / cm 2 . If the bending stiffness of the thermoplastic resin is less than 200 kgf / cm 2, it is too soft and has poor mechanical strength. Therefore, cutting or breaking may occur when the pipe is towed and installed into the existing pipe, which may reduce reliability. It will be lacking. On the other hand, those having a weight of more than 5,000 kgf / cm 2 have insufficient flexibility, and it is difficult to deform and pull and insert the pipe into the existing pipe having many bent portions at room temperature.
【００１１】本発明において、常温で可撓性を有する熱
可塑性樹脂からなるパイプの周壁に軸方向と平行に埋設
する補強条材としては、ガラス繊維、炭素繊維、ボロン
繊維、金属繊維等の無機繊維、またはアラミド繊維、ビ
ニロン繊維、ポリエステル繊維、ポリアミド繊維、木綿
等の合成もしくは天然の有機繊維などの単繊維、集束繊
維、撚糸、フラットヤーン等、およびそれらを用いた織
布、不織布、編布等からなるテープ、帯状体等の繊維製
品群が挙げられる。また、他の例としては、鉄、鋼、黄
銅、銅等の金属材料、それらの撚線、ワイヤロープ等が
挙げられる。なお、上記補強条材の役割は、既設配管内
に補修用パイプを挿入する際の破断を防止するために、
引張荷重を負担してパイプの強度を増大させることであ
る。In the present invention, the reinforcing strips to be embedded in the peripheral wall of the pipe made of a thermoplastic resin having flexibility at room temperature in parallel with the axial direction include inorganic materials such as glass fiber, carbon fiber, boron fiber and metal fiber. Fibers, monofilaments such as aramid fibers, vinylon fibers, polyester fibers, polyamide fibers, synthetic or natural organic fibers such as cotton, bundled fibers, twisted yarns, flat yarns, etc., and woven, non-woven or knitted fabrics using them. Examples include tapes, strips, and other fiber products made of the like. Other examples include metal materials such as iron, steel, brass, and copper, and twisted wires and wire ropes thereof. The role of the reinforcing strips is to prevent breakage when inserting the repair pipe into the existing pipe,
The purpose is to bear the tensile load and increase the strength of the pipe.
【００１２】上記補強条材は、その破断点伸びが熱可塑
性樹脂の降伏点伸びに近いものを選択することが望まし
い。補強条材の破断点伸びと熱可塑性樹脂の降伏点伸び
が等しい場合に、補強条材と熱可塑性樹脂の強度の和が
最大となる。補強条材の破断点伸びが熱可塑性樹脂の降
伏点伸びより大きい場合には、パイプに伸びが発生する
ので好ましくない。補修用パイプの引張降伏点荷重は６
００〜１,０００kgf であることが好ましい。本発明の
補修用パイプは、屈曲部を有する既設配管に適用し得る
ことが望ましく、既設配管には通常３０〜９０゜の屈曲
部が多数存在する。引張降伏点荷重が６００kgf 未満で
は、これらの屈曲部を通して牽引挿入するときにパイプ
の伸びや切断が起こるため好ましくない。また引張降伏
点荷重が１,０００kgf を超えると、牽引挿入するとき
に既設配管の破壊が生じるなどの懸念がある。なお、補
強条材の断面積は、上記の引張降伏点荷重を確保するこ
とができるように、補強条材の材料および本数に応じて
適宜決定する。It is desirable to select the reinforcing strip material whose elongation at break is close to the elongation at yield of the thermoplastic resin. When the elongation at break of the reinforcing strip and the elongation at yield of the thermoplastic resin are equal, the sum of the strengths of the reinforcing strip and the thermoplastic resin becomes maximum. When the elongation at break of the reinforcing strip is larger than the elongation at yield of the thermoplastic resin, elongation is generated in the pipe, which is not preferable. Tensile yield point load of repair pipe is 6
It is preferably from 00 to 1,000 kgf. The repair pipe of the present invention is preferably applicable to an existing pipe having a bent portion, and the existing pipe usually has many bent portions of 30 to 90 °. When the tensile yield point load is less than 600 kgf, the pipe is stretched or cut when it is pulled and inserted through these bent portions, which is not preferable. Further, if the tensile yield point load exceeds 1,000 kgf, there is a concern that the existing pipe may be broken during pulling and insertion. The cross-sectional area of the reinforcing strip is appropriately determined according to the material and the number of reinforcing strips so that the above tensile yield point load can be secured.
【００１３】本発明の補修用パイプの肉厚は、最終的に
は既設配管の用途、種類、耐用年数、使用頻度、口径、
膨張率、輸送内容物等により適宜決定されるが、一般的
には０.５〜２０ｍｍ、好ましくは１.０〜１５ｍｍ、さ
らに好ましくは１.０〜１０ ｍｍの範囲から選択され
る。また、補修用パイプの外径は、既設配管の内径の７
０〜１１０％程度の範囲が望ましい。外径が既設配管の
内径の１１０％を超えると既設配管内への挿入が困難と
なったり、挿入後拡張したときにしわが発生する懸念が
あり、７０％未満であると既設配管内へ挿入後拡張した
ときに周壁に空隙または偏肉を生じる懸念がある。The wall thickness of the repair pipe of the present invention is ultimately determined by the use, type, service life, frequency of use, diameter, etc. of the existing pipe.
Although it is appropriately determined depending on the expansion coefficient, the contents of transportation, etc., it is generally selected from the range of 0.5 to 20 mm, preferably 1.0 to 15 mm, more preferably 1.0 to 10 mm. The outer diameter of the repair pipe is 7 times the inner diameter of the existing pipe.
The range of 0 to 110% is desirable. If the outer diameter exceeds 110% of the inner diameter of the existing pipe, it may be difficult to insert it into the existing pipe, or wrinkles may occur when expanded after the insertion. If it is less than 70%, it may be inserted into the existing pipe. When expanded, there is a risk of creating voids or uneven thickness on the peripheral wall.
【００１４】以下、本発明の補修用パイプを添付図面に
基づいて詳述する。図１は、本発明の補修用パイプにお
いて、内周面に補強条材を埋設した一実施態様の断面斜
視図である。補修用パイプ１ａは、補強条材２を可撓性
を有する熱可塑性樹脂層３の内周面に軸方向と平行に埋
設したものである。図２は、補修用パイプの肉厚中間部
に補強条材を埋設した一実施態様の断面斜視図である。
補修用パイプ１ｂは、補強条材２を熱可塑性樹脂層３の
パイプ壁の肉厚中間部に軸方向と平行に埋設したもので
ある。図３は、補修用パイプの外周面に補強条材を埋設
した一実施態様の断面斜視図である。補修用パイプ１ｃ
は、補強条材２を熱可塑性樹脂層３の外周面に軸方向と
平行に埋設したものである。The repair pipe of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional perspective view of an embodiment in which a reinforcing strip is embedded in an inner peripheral surface of a repair pipe of the present invention. The repair pipe 1a has a reinforcing strip 2 embedded in the inner peripheral surface of a flexible thermoplastic resin layer 3 parallel to the axial direction. FIG. 2 is a cross-sectional perspective view of an embodiment in which a reinforcing strip is embedded in the middle portion of the repair pipe.
In the repair pipe 1b, the reinforcing strip 2 is embedded in the middle portion of the thickness of the pipe wall of the thermoplastic resin layer 3 in parallel with the axial direction. FIG. 3 is a cross-sectional perspective view of an embodiment in which a reinforcing strip is embedded in the outer peripheral surface of a repair pipe. Repair pipe 1c
Is a reinforcing strip 2 embedded in the outer peripheral surface of the thermoplastic resin layer 3 parallel to the axial direction.
【００１５】これらの補強条材は、図１から図３に示し
たように、熱可塑性樹脂パイプの周壁の内周面、肉圧中
間部および外周面のいずれに埋設することもできる。ま
たその配置方法は、樹脂管の周壁に沿って等間隔に配置
することが一般的であるが、場合により樹脂管の周壁の
一部のみに偏在する状態に配置してもよい。補強条材の
数は、パイプ径により異なるが、３〜２０本程度が用い
られ、好ましくは５本以上である。また、隣接する補強
条材は相互に十分な間隔を保ち、樹脂管の円周方向の変
形を妨げないようにすることが必要である。As shown in FIGS. 1 to 3, these reinforcing strips can be embedded in any of the inner peripheral surface, the intermediate wall thickness portion and the outer peripheral surface of the peripheral wall of the thermoplastic resin pipe. In addition, the arranging method is generally arranged at equal intervals along the peripheral wall of the resin pipe, but in some cases, it may be arranged so as to be unevenly distributed only on a part of the peripheral wall of the resin pipe. The number of reinforcing strips varies depending on the pipe diameter, but about 3 to 20 are used, and preferably 5 or more. Further, it is necessary that the adjacent reinforcing strips be sufficiently spaced from each other so as not to interfere with the circumferential deformation of the resin pipe.
【００１６】上記補修用パイプの製造方法としては、押
出成形等により樹脂パイプを成形する際に同時に補強条
材を埋設してもよく、また樹脂パイプを押出した直後に
その外周面に補強条材を添接し、押圧手段を用いて埋設
してもよい。さらに、予め配列した補強条材の表裏両面
を熱可塑性樹脂により被覆して一体化したシートを作製
した後、これをパイプ状に成形してもよく、また予め成
形したパイプの外周面に補強条材を添接し、その上に樹
脂シートを接着剤等で貼合わせて一体化することもでき
る。本発明の補修用パイプは、円形断面のまま用いるこ
とができるが、保管、輸送など便宜のために、偏平形状
に変形して卷取り、そのまま使用することができる。As a method of manufacturing the above-mentioned repair pipe, a reinforcing strip may be embedded at the same time when the resin pipe is formed by extrusion molding or the reinforcing strip may be formed on the outer peripheral surface immediately after the resin pipe is extruded. May be attached and embedded by using a pressing means. Furthermore, the front and back surfaces of the prearranged reinforcing strips may be coated with a thermoplastic resin to form an integrated sheet, which may then be formed into a pipe shape, or the reinforcing strips may be formed on the outer peripheral surface of the preformed pipe. It is also possible to attach a material, and to bond the resin sheet on it with an adhesive or the like for integration. The repair pipe of the present invention can be used as it is in a circular cross section, but for convenience of storage, transportation, etc., it can be deformed into a flat shape, rolled up, and used as it is.
【００１７】本発明においては、熱可塑性樹脂と補強条
材との接着力を向上させるために、予め補強条材に化学
的または物理的な表面処理を施してもよい。化学的表面
処理としては、ステアリン酸、オレイン酸、パルミチン
酸などの脂肪酸またはその金属塩、パラフィンワック
ス、ポリエチレンワックスなどのワックスまたはそれら
の変性物、変性ポリエチレン、有機ボラン、有機チタネ
ートなどで被覆する方法が挙げられる。物理的表面処理
としては、コロナ放電処理、プラズマ処理、紫外線処理
等が挙げられる。In the present invention, in order to improve the adhesive force between the thermoplastic resin and the reinforcing strip, the reinforcing strip may be previously subjected to a chemical or physical surface treatment. As the chemical surface treatment, a method of coating with fatty acids such as stearic acid, oleic acid and palmitic acid or metal salts thereof, waxes such as paraffin wax and polyethylene wax or modified products thereof, modified polyethylene, organic borane, organic titanate, etc. Is mentioned. Examples of the physical surface treatment include corona discharge treatment, plasma treatment, ultraviolet treatment and the like.
【００１８】本発明において用いる熱可塑性樹脂パイプ
の成形方法としては、押出成形法、射出成形法等が用い
られ、特に限定されるものではない。また、本発明の要
旨を逸脱しない範囲において、熱可塑性樹脂に対して、
帯電防止剤、防曇剤、有機あるいは無機充填剤、酸化防
止剤、滑剤、有機あるいは無機顔料、紫外線吸収剤、分
散剤、造核剤、発泡剤、難燃剤、架橋剤等の添加剤を配
合してもよい。As a method for molding the thermoplastic resin pipe used in the present invention, an extrusion molding method, an injection molding method or the like can be used, and it is not particularly limited. Further, within a range not departing from the gist of the present invention, with respect to the thermoplastic resin,
Additives such as antistatic agents, antifogging agents, organic or inorganic fillers, antioxidants, lubricants, organic or inorganic pigments, UV absorbers, dispersants, nucleating agents, foaming agents, flame retardants, crosslinking agents, etc. You may.
【００１９】本発明の補修用パイプを適用し得る既設配
管としては、前記水道管、ガス管等のほか、排気管や電
気配線用収納管など各種の目的に使用される配管であっ
て、金属管、ヒューム管、アスベスト管、合成樹脂管等
の広範囲の材料からなるものが挙げられる。The existing pipes to which the repair pipe of the present invention can be applied include pipes used for various purposes such as the water pipe, the gas pipe, the exhaust pipe and the storage pipe for electric wiring. Examples include a wide range of materials such as pipes, fume pipes, asbestos pipes, and synthetic resin pipes.
【００２０】次に、本発明の既設配管の補修方法につい
て詳述する。まず、既設配管を補修に適する長さ（例え
ば１００〜２００ｍ）に区切り、埋設管の場合にはその
両端で地上から竪穴を掘削した後、既設配管の両端を開
放し、その開口部を利用して既設配管の内部を掃除す
る。次いで、補修用パイプを、断面の最大差渡しが既設
配管の内径より小さくなるように、例えばＵ字型などに
変形して、一方の開口部から既設配管内に挿入し、他の
開口部から挿通した牽引ロープ等を補修用パイプの先端
に結合して牽引し、補修用パイプを他端の開口部まで挿
通する。続いて、補修用パイプの一端を閉塞し、パイプ
内に空気、スチーム、水、温水等の流体を供給して内面
から加圧することにより、補修用パイプの断面形状を復
元すると共に既設配管の内面に密着させる。復元に用い
る圧力は、０.２〜５kg/cm2・Gの範囲である。次いで、
開放した既設配管の両端を接続し、埋設管の場合には竪
穴を埋めもどして補修を完了する。Next, the method for repairing the existing pipe of the present invention will be described in detail. First, divide the existing pipe into a length suitable for repair (for example, 100 to 200 m), and in the case of a buried pipe, after excavating vertical holes from the ground at both ends, open both ends of the existing pipe and use the opening. Clean the inside of the existing pipe. Next, the repair pipe is deformed into, for example, a U-shape so that the maximum cross-section cross section is smaller than the inner diameter of the existing pipe, and is inserted into the existing pipe through one opening, and then the other pipe is opened. The tow rope etc. inserted is connected to the tip of the repair pipe and towed, and the repair pipe is inserted to the opening at the other end. Next, by closing one end of the repair pipe and supplying a fluid such as air, steam, water, or hot water into the pipe to pressurize it from the inner surface, the cross-sectional shape of the repair pipe is restored and the inner surface of the existing pipe is restored. In close contact with. The pressure used for restoration is in the range of 0.2 to 5 kg / cm 2 · G. Then
Connect both ends of the existing open pipe, and in the case of a buried pipe, refill the vertical holes to complete the repair.
【００２１】本発明の補修用パイプは、常温で可撓性に
優れているため、管路に多数の屈曲部が存在しても既設
配管内へ円滑に挿通することができる。また、可撓性に
優れ、柔軟性に富むにもかかわらず、その周壁には軸方
向と平行に補強条材を埋設してあるため、既設配管が長
尺の場合においても、挿通する際に引張荷重によって破
断することはない。また、挿通した補修用パイプは、常
温で可撓性に優れ、かつ周壁には補強条材を軸方向にの
み埋設してあるため、一端を閉塞して他端から流体を供
給し加圧することによって、容易に円筒状の原形に復元
し、既設配管の内壁に密着させることが可能である。な
お、必要であれば既設配管の内面と補修用パイプの外面
とを接着剤を介して接合してもよい。Since the repair pipe of the present invention is excellent in flexibility at room temperature, it can be smoothly inserted into the existing pipe even if there are many bent portions in the pipe line. In addition, even though it is excellent in flexibility and has a lot of flexibility, a reinforcing strip is embedded in its peripheral wall parallel to the axial direction, so even when the existing pipe is long, it can be easily inserted. It does not break under tensile load. In addition, the repair pipe inserted is excellent in flexibility at room temperature, and the reinforcing strip is embedded in the peripheral wall only in the axial direction.Therefore, close one end and supply the fluid from the other end to pressurize. By this, it is possible to easily restore the original shape of the cylindrical shape and bring it into close contact with the inner wall of the existing pipe. If necessary, the inner surface of the existing pipe and the outer surface of the repair pipe may be joined with an adhesive.
【００２２】[0022]
【実施例】以下、本発明を実施例に基づいてさらに詳述
する。物性の測定に用いた試験方法は以下の通りであ
る。 （物性試験方法） 密度： ＪＩＳ Ｋ６７６０ 準拠 ＭＦＲ： ＪＩＳ Ｋ６７６０ 準拠 引張降伏点荷重： ＪＩＳ Ｋ６３０１ 準拠 引張伸び： ＪＩＳ Ｋ６３０１ 準拠 曲げこわさ： ＪＩＳ Ｋ７１０６ 準拠EXAMPLES The present invention will be described in more detail based on the following examples. The test methods used for measuring the physical properties are as follows. (Physical property test method) Density: JIS K6760 compliant MFR: JIS K6760 compliant Tensile yield point load: JIS K6301 compliant Tensile elongation: JIS K6301 compliant Bending stiffness: JIS K7106 compliant
【００２３】＜実施例１＞密度０.９０５g/cm3、ＭＦＲ
１.０g/10分および曲げこわさ７３０kgf/cm2の超低密度
ポリエチレン（商品名：日石ソフトレックス Ｄ９５１
０、日本石油化学(株)製）を、パイプ成形機（スクリュ
ー径６０ｍｍ、Ｌ／Ｄ比２０の押出機）により成形温度
１６５℃で押出し、一方、予めステアリン酸カルシウム
で表面処理を行った２０号のたこ糸（径２.０ｍｍの木
綿撚糸）からなる補強条材１６本を、補強条材送出リー
ルからパイプ成形機のダイスに供給し、上記超低密度ポ
リエチレン製パイプの内周面に等間隔、かつ軸方向と平
行に配列して埋設し、図１に示す補修用パイプを製造し
た。パイプの外径は５０ｍｍ、肉厚は４ｍｍであり、引
張降伏点荷重は７３４kgf であった。地下に埋設された
既設配管５０ｍを修復工区として、その両端を掘削し、
既設配管の内面の錆やスケールを除去した。次いで、上
記パイプを偏平に押し潰し、断面がＵ字型になるように
軸方向に２つ折にして既設配管内へ挿入し易いように変
形した後、既設配管の一端から引き込み治具を用いて挿
通した。既設配管の内径は５５ｍｍであり、既設配管内
には９０゜の屈曲部が５箇所存在したが、パイプの伸び
や破損はなく、円滑に挿通することができた。さらに挿
通したパイプの一端を閉塞し、スチームの圧力で加圧し
て膨張させ、Ｕ字型に変形したパイプを元の円筒状に復
元し、かつ既設配管内壁に密着させて補修を完了した。
このように、既設配管の補修用パイプとして十分な可撓
性を有しており、軸方向の伸びがなく、かつ補修用パイ
プの引張降伏点荷重以下の力で挿通することができた。
またパイプの円周方向に伸長し得るため、既設配管の内
壁へ良好に密着させることができた。<Example 1> Density 0.905 g / cm 3 , MFR
1.0 g / 10 min and flexural stiffness 730kgf / cm 2 ultra-low density polyethylene (trade name: Nisseki Soft Rex D951
No. 20, manufactured by Nippon Petrochemical Co., Ltd., was extruded at a molding temperature of 165 ° C. by a pipe molding machine (extruder having a screw diameter of 60 mm and an L / D ratio of 20), while being surface-treated with calcium stearate in advance. 16 pieces of reinforcing strips made of sawtooth yarn (twisted cotton yarn with a diameter of 2.0 mm) are supplied from the reinforcing strip feeding reel to the die of the pipe forming machine, and are evenly spaced on the inner peripheral surface of the ultra low density polyethylene pipe. Further, the repair pipe shown in FIG. 1 was manufactured by arranging the pipes parallel to the axial direction and burying them. The outer diameter of the pipe was 50 mm, the wall thickness was 4 mm, and the tensile yield point load was 734 kgf. Excavating both ends of the existing pipe 50m buried underground as a repair work section,
Rust and scale on the inner surface of the existing pipe were removed. Next, the pipe is flatly crushed, folded in two in the axial direction so as to have a U-shaped cross section, deformed so as to be easily inserted into the existing pipe, and then a pulling jig is used from one end of the existing pipe. I inserted it. The existing pipe had an inner diameter of 55 mm, and there were five 90 ° bends in the existing pipe, but the pipe was not stretched or damaged, and could be inserted smoothly. Further, one end of the inserted pipe was closed, pressurized by steam pressure to expand, the U-shaped deformed pipe was restored to the original cylindrical shape, and the pipe was adhered to the inner wall of the existing pipe to complete the repair.
Thus, the existing pipe had sufficient flexibility as a repair pipe, had no axial extension, and could be inserted with a force equal to or lower than the tensile yield point load of the repair pipe.
Further, since it can extend in the circumferential direction of the pipe, it was possible to make good adhesion to the inner wall of the existing pipe.
【００２４】＜実施例２＞補強条材として直径１.０ｍ
ｍのステンレス鋼ワイヤを用いた他は、実施例１と同様
にして補修用パイプの製造および補修を行い、良好な結
果を得た。得られたパイプの引張降伏点荷重は７１１kg
f であった。<Example 2> 1.0 m diameter as a reinforcing strip
A repair pipe was manufactured and repaired in the same manner as in Example 1 except that the stainless steel wire of m was used, and good results were obtained. The tensile yield point load of the obtained pipe is 711 kg.
It was f.
【００２５】＜実施例３＞補強条材として直径２.０ｍ
ｍのアラミド繊維を用いた他は、実施例１と同様にして
補修用パイプの製造および補修を行い、良好な結果を得
た。得られたパイプの引張降伏点荷重は８０７kgf であ
った。<Example 3> Diameter of 2.0 m as a reinforcing strip
A repair pipe was manufactured and repaired in the same manner as in Example 1 except that m aramid fiber was used, and good results were obtained. The tensile yield point load of the obtained pipe was 807 kgf.
【００２６】＜比較例１＞熱可塑性樹脂として、ウレタ
ン系エラストマー（曲げこわさ１８０kgf/cm2）を用
い、補強条材なしで実施例１と同様にしてパイプを製造
した。得られたパイプの引張降伏点荷重は４８０kgf で
あり、既設配管内にパイプを牽引挿入しようとしたが、
パイプが切断し、挿通は不可能であった。Comparative Example 1 A pipe was manufactured in the same manner as in Example 1 except that a urethane elastomer (bending stiffness of 180 kgf / cm 2 ) was used as the thermoplastic resin and no reinforcing strip was used. The tensile yield point load of the obtained pipe was 480 kgf, and I tried to pull and insert the pipe into the existing pipe.
The pipe was cut and it was impossible to insert it.
【００２７】＜比較例２＞熱可塑性樹脂として、密度
０.９５０g/cm3、ＭＦＲ０.１５g/10分および曲げこわ
さ６,７００kgf/cm2の高密度ポリエチレン（商品名：日
石スタフレン Ｅ８０１（Ｄ）、日本石油化学(株)製）
を用い、実施例１と同様に補強条材を埋設してパイプを
製造した。得られたパイプは可撓性が不十分であり、常
温でパイプを変形して既設配管に牽引挿入しようとした
が、９０゜の屈曲部を挿通することができなかった。<Comparative Example 2> As a thermoplastic resin, a high density polyethylene having a density of 0.950 g / cm 3 , a MFR of 0.15 g / 10 min and a bending stiffness of 6,700 kgf / cm 2 (trade name: Nisseki Staflen E801 (D ), Manufactured by Nippon Petrochemical Co., Ltd.)
Was used to embed a reinforcing strip in the same manner as in Example 1 to produce a pipe. The obtained pipe had insufficient flexibility, and the pipe was deformed at room temperature to try to pull and insert it into the existing pipe, but the 90 ° bent portion could not be inserted.
【００２８】[0028]
【発明の効果】本発明の補修用パイプは、周壁に軸方向
と平行に繊維、繊維製品、ワイヤ等の補強条材を埋設し
て、軸方向の強度を補強し伸びを抑制したことにより、
補修工事においてパイプの変形や破断を防止することが
できる。さらに、特定範囲の曲げこわさを有する熱可塑
性樹脂を用い、かつ補修用パイプの円周方向に沿って補
強部材を設けていないので、パイプは可撓性に富み、円
周方向に伸縮性を有している。従って、屈曲部が多数存
在する既設配管においても施工が容易であり、既設配管
の内壁へ良好に密着させることができる。また、従来法
のように加熱を行って変形する必要がないので、作業性
および安全性に優れ、かつ迅速な施工が可能である。以
上の特性を有するパイプは、水道管、ガス管等の既設配
管を補修または更生する際に好適に使用することができ
る。EFFECTS OF THE INVENTION The repairing pipe of the present invention is constructed by embedding a reinforcing strip material such as a fiber, a fiber product, or a wire in the peripheral wall in parallel with the axial direction to reinforce the axial strength and suppress the elongation.
It is possible to prevent deformation and breakage of pipes during repair work. Furthermore, since a thermoplastic resin having a bending stiffness in a specific range is used and no reinforcing member is provided along the circumferential direction of the repair pipe, the pipe is highly flexible and has elasticity in the circumferential direction. are doing. Therefore, the construction is easy even in an existing pipe having a large number of bent portions, and it can be closely adhered to the inner wall of the existing pipe. Further, unlike the conventional method, there is no need to perform heating and deformation, so that workability and safety are excellent, and quick construction is possible. The pipe having the above characteristics can be suitably used when repairing or rehabilitating an existing pipe such as a water pipe or a gas pipe.
【図１】内周面に補強条材を埋設した補修用パイプの一
例を示す断面斜視図である。FIG. 1 is a cross-sectional perspective view showing an example of a repair pipe in which a reinforcing strip is embedded in an inner peripheral surface.
【図２】肉厚中間部に補強条材を埋設した補修用パイプ
の一例を示す断面斜視図である。FIG. 2 is a cross-sectional perspective view showing an example of a repair pipe in which a reinforcing strip is embedded in a middle portion of the wall thickness.
【図３】外周面に補強条材を埋設した補修用パイプの一
例を示す断面斜視図である。FIG. 3 is a sectional perspective view showing an example of a repair pipe in which a reinforcing strip is embedded on the outer peripheral surface.
１ａ、１ｂ、１ｃ 補修用パイプ ２ 補強条材 ３ 熱可塑性樹脂層 1a, 1b, 1c Repair pipe 2 Reinforcing strip 3 Thermoplastic resin layer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長沼 徹郎 神奈川県川崎市高津区梶ヶ谷２−11−２ ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuro Naganuma 2-11-2 Kajigaya, Takatsu-ku, Kawasaki-shi, Kanagawa
Claims (5)
なるパイプの周壁に軸方向と平行に少なくとも１本の補
強条材を埋設したことを特徴とする既設配管の補修用パ
イプ。1. A repair pipe for an existing pipe, wherein at least one reinforcing strip is embedded in the peripheral wall of the pipe made of a thermoplastic resin having flexibility at room temperature in parallel with the axial direction.
〜５,０００kgf/cm2であることを特徴とする請求項１に
記載の既設配管の補修用パイプ。2. The bending stiffness of the thermoplastic resin is 200.
The pipe for repairing the existing pipe according to claim 1, wherein the pipe is 5,000 kgf / cm 2 .
維またはそれらの繊維製品からなることを特徴とする請
求項１または２に記載の既設配管の補修用パイプ。3. The repair pipe for an existing pipe according to claim 1, wherein the reinforcing strip is made of an inorganic fiber, an organic fiber or a fiber product thereof.
レン、エチレン−酢酸ビニル共重合体、エチレン−アク
リル酸エチル共重合体、エチレン−プロピレン共重合体
ゴムおよび熱可塑性エラストマーから選択された少なく
とも１種であることを特徴とする請求項１から３のいず
れかに記載の既設配管の補修用パイプ。4. The thermoplastic resin is at least one selected from ultra-low density polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-propylene copolymer rubber and thermoplastic elastomer. A repair pipe for an existing pipe according to any one of claims 1 to 3, characterized in that it is a kind.
修するにあたり、常温で可撓性を有する熱可塑性樹脂か
らなるパイプの周壁に軸方向と平行に少なくとも１本の
補強条材を埋設してなる補修用パイプを、断面の最大差
渡しが該既設配管の内径より小さくなるように変形して
既設配管の一端開口部から挿入し、該既設配管の他端開
口部側から牽引して挿通した後、該補修用パイプを内面
側から加圧して断面形状を復元しかつ既設配管の内面に
密着させることを特徴とする既設配管の補修方法。5. When repairing an existing pipe having a plurality of bent portions, at least one reinforcing strip is embedded parallel to the axial direction in the peripheral wall of a pipe made of a thermoplastic resin having flexibility at room temperature. The repair pipe is deformed so that the maximum cross-section of the cross section is smaller than the inner diameter of the existing pipe, and is inserted from one end opening of the existing pipe, and pulled by inserting from the other end opening side of the existing pipe. After that, the method for repairing an existing pipe is characterized in that the repair pipe is pressurized from the inner surface side to restore the cross-sectional shape and to be brought into close contact with the inner surface of the existing pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7145351A JPH08312843A (en) | 1995-05-19 | 1995-05-19 | Repairing pipe for existing piping and repairing method using such pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7145351A JPH08312843A (en) | 1995-05-19 | 1995-05-19 | Repairing pipe for existing piping and repairing method using such pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08312843A true JPH08312843A (en) | 1996-11-26 |
Family
ID=15383189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7145351A Pending JPH08312843A (en) | 1995-05-19 | 1995-05-19 | Repairing pipe for existing piping and repairing method using such pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08312843A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0908656A1 (en) * | 1997-08-18 | 1999-04-14 | Pfaudler Werke GmbH | Tubular article used as a valve seat |
| JP2005240961A (en) * | 2004-02-27 | 2005-09-08 | Nishihara Engineering Co Ltd | Fluid piping |
| KR100785250B1 (en) * | 2006-06-21 | 2007-12-12 | 주식회사 포스코 | Hydroforming method for preventing exprosion defect of tube |
| CN107606380A (en) * | 2017-09-29 | 2018-01-19 | 北京中财万鑫科技有限公司 | A kind of pipe renovating system and method |
| CN110701425A (en) * | 2019-09-12 | 2020-01-17 | 上海井园市政工程有限公司 | Non-excavation type pipeline repairing method |
| JP2021020624A (en) * | 2019-07-30 | 2021-02-18 | 横浜ゴム株式会社 | Piping system for air conditioner mounted on automobile |
-
1995
- 1995-05-19 JP JP7145351A patent/JPH08312843A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0908656A1 (en) * | 1997-08-18 | 1999-04-14 | Pfaudler Werke GmbH | Tubular article used as a valve seat |
| JP2005240961A (en) * | 2004-02-27 | 2005-09-08 | Nishihara Engineering Co Ltd | Fluid piping |
| KR100785250B1 (en) * | 2006-06-21 | 2007-12-12 | 주식회사 포스코 | Hydroforming method for preventing exprosion defect of tube |
| CN107606380A (en) * | 2017-09-29 | 2018-01-19 | 北京中财万鑫科技有限公司 | A kind of pipe renovating system and method |
| JP2021020624A (en) * | 2019-07-30 | 2021-02-18 | 横浜ゴム株式会社 | Piping system for air conditioner mounted on automobile |
| US11813920B2 (en) | 2019-07-30 | 2023-11-14 | The Yokohama Rubber Co., Ltd. | Piping system for air conditioner installed in vehicle |
| CN110701425A (en) * | 2019-09-12 | 2020-01-17 | 上海井园市政工程有限公司 | Non-excavation type pipeline repairing method |
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