JP2007255479A - Composite tube for lining conduit - Google Patents

Composite tube for lining conduit Download PDF

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Publication number
JP2007255479A
JP2007255479A JP2006078030A JP2006078030A JP2007255479A JP 2007255479 A JP2007255479 A JP 2007255479A JP 2006078030 A JP2006078030 A JP 2006078030A JP 2006078030 A JP2006078030 A JP 2006078030A JP 2007255479 A JP2007255479 A JP 2007255479A
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pipe
tube
layer
metal tape
conduit
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Toru Kagoura
徹 籠浦
Kozo Imai
浩三 今井
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Furukawa Electric Co Ltd
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Furukawa Electric Co Ltd
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  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite tube for lining a conduit which is hard to get flaws even if scale sticking to the inside surface of the conduit is present when the tube is drawn in an existing conduit, and capable of being easily drawn into the conduit suppressing increase in the outside diameter. <P>SOLUTION: A protective tape winding layer 4, an inner pressure reinforcement layer 5, a protective tape winding layer 6, a corrosion-proof layer 7, and an outside flaw preventing spiral tube 2 are sequentially provided on the outer periphery of a resin inner tube 1 molded by extrusion. The outside flaw preventing spiral tube 2 is formed by winding, in spiral, a metal tape 3 which is bent in S shape, in cross section, for engagement at both edges, while both edges are engaged. The inner pressure reinforcement layer 5 is formed by gap-winding the metal tape 8. The gap width G of the metal tape 9 is 5-15% of tape width W. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、管路引き込み用複合管に関し、特に老朽管路に引き込んで管路を更新するのに好適な複合管に関するものである。   The present invention relates to a composite pipe for pipe drawing, and particularly to a composite pipe suitable for renewing a pipe by drawing into an old pipe.

老朽化した水道管路、ガス管路、送油管路などを再生する手段として、既設老朽管路内に、その内径より小さい外径を有する可撓管を引き込んで、再び管路として使用できるようにするパイプインパイプ工法が知られている。この工法に適用できる可撓管としては、樹脂管の外周に補強用の外装線材を螺旋巻きし、その外周に外装線材保護用の座床層を設けた複合管が公知である(特許文献1参照)。   As a means to regenerate old water pipes, gas pipes, oil supply pipes, etc., a flexible pipe having an outer diameter smaller than its inner diameter can be drawn into an existing old pipe so that it can be used again. The pipe-in-pipe method is known. As a flexible pipe applicable to this construction method, a composite pipe in which a reinforcing sheathing wire is spirally wound around the outer periphery of a resin tube and a seating floor layer for protecting the sheathing wire is provided on the outer periphery is known (Patent Document 1). reference).

特開2001−263574号公報JP 2001-263574 A

既設老朽管路の内面には、腐食等によるスケールが多量に付着しており、そのような管路内に上記のような複合管を引き込むと、管の最外層がスケールによる突起等で傷つけられて、切れや剥離を生じ、内層側の外装線材や樹脂管が損傷するおそれがある。外装線材や樹脂管が損傷すると、内圧に対する強度が不十分になる可能性がある。   A large amount of scale due to corrosion or the like adheres to the inner surface of existing aging pipes, and when the above composite pipes are drawn into such pipes, the outermost layer of the pipes is damaged by projections by the scales, etc. As a result, cutting or peeling may occur, and the outer-layer exterior wire or resin tube may be damaged. If the exterior wire rod or the resin tube is damaged, the strength against the internal pressure may be insufficient.

また、管路引き込み用の管として、樹脂管の外側に金属コルゲート管を設けたものも知られているが、コルゲート管は可撓性をもたせるために、ある程度以上の波の高さが必要であり、その分、外径が大きくなる。外径が大きくなると、既設管路への引き込み抵抗が大きくなるので、好ましくない。またコルゲート管は、その波形形状からも、老朽管路内面のスケールとの摩擦抵抗が大きくなる要素を有しており、引き込み張力が過大となって管が破壊してしまうおそれもある。   In addition, a pipe for drawing a pipe is known in which a metal corrugated pipe is provided outside the resin pipe. However, the corrugated pipe needs to have a certain wave height in order to be flexible. Yes, the outer diameter increases accordingly. An increase in the outer diameter is not preferable because the pull-in resistance to the existing pipeline increases. In addition, the corrugated pipe also has an element that increases the frictional resistance with the scale of the inner surface of the old pipe line due to its corrugated shape, and there is a possibility that the pipe will be broken due to excessive pulling tension.

本発明の目的は、既設管路に引き込む際に、管路内面にスケールが付着していても傷がつき難く、しかも外径の増大を抑えて管路内引き込みを容易に行うことができる管路引き込み用複合管を提供することにある。   An object of the present invention is to provide a pipe that is difficult to be damaged even when a scale adheres to the inner surface of an existing pipe line while being pulled into an existing pipe line, and that can be easily drawn into the pipe line while suppressing an increase in outer diameter. The object is to provide a composite pipe for road entry.

本発明に係る管路引き込み用複合管は、押出成形された樹脂製内管の外側に、両側縁が係合可能となるように断面略S字状に屈曲された金属テープを両側縁を係合させつつ螺旋状に巻回することにより形成された外傷防止用螺旋管を配置したことを特徴とするものである。   The composite pipe for drawing a pipe according to the present invention has a metal tape that is bent in a substantially S-shaped cross section so that both side edges can be engaged with the outer side of the extruded resin inner pipe. It is characterized by arranging a spiral tube for preventing injury formed by winding in a spiral manner.

本発明において、外傷防止用螺旋管は、管路に引き込むときに先端側になる方が硬度の高い金属テープで構成され、後端側になる方が先端側よりも硬度の低い金属テープで構成されていることが好ましい。   In the present invention, the spiral tube for preventing trauma is composed of a metal tape having a higher hardness on the tip side when drawn into the conduit, and a metal tape having a lower hardness on the rear end side than the tip side. It is preferable that

本発明によれば、樹脂製内管の外側に金属製の外傷防止用螺旋管が配置されているため、既設老朽管路に引き込む際に、管路内面のスケールは外傷防止用螺旋管によって削られるから、樹脂製内管が傷つけられるおそれがない。また、樹脂製内管の外側に外傷防止用螺旋管を設けたことにより、螺旋管にテンションメンバーとしての機能をもたせることができるので、複合管全体の引張強度を向上させることができる。また、外傷防止用螺旋管は、樹脂製内管の内圧補強層としても機能するので、内圧に対する強度を高めることもできる。   According to the present invention, since the metal wound prevention spiral tube is disposed outside the resin inner tube, the scale on the inner surface of the pipeline is removed by the damage prevention spiral tube when drawn into the existing aging pipeline. Therefore, there is no possibility that the resin inner pipe is damaged. Further, by providing the wound prevention spiral tube outside the resin inner tube, the spiral tube can have a function as a tension member, so that the tensile strength of the entire composite tube can be improved. Moreover, since the wound preventing spiral tube also functions as an internal pressure reinforcing layer of the resin inner tube, it is possible to increase the strength against the internal pressure.

さらに、外傷防止用螺旋管は、管路に引き込むときに先端側になる方を硬度の高い金属テープで構成し、後端側になる方を先端側よりも硬度の低い金属テープで構成することにより、先端側は、老朽管路に引き込むときにスケールと擦れ合っても傷がつき難く、逆にスケールの突起を削り取る機能を高めることができると共に、後端側は、先端側よりも安価な金属テープを使用できるので外傷防止用螺旋管全体の材料コストを低減することができる。   Furthermore, the spiral tube for preventing trauma should be composed of a metal tape having a higher hardness on the tip side when drawn into the conduit, and a metal tape having a lower hardness than the tip side on the side becoming the rear end side. As a result, the tip side is less likely to be scratched even if it is rubbed against the scale when it is pulled into an old pipeline, and on the contrary, the function of scraping off the scale protrusion can be enhanced, and the rear end side is less expensive than the tip side. Since a metal tape can be used, the material cost of the entire wound prevention spiral tube can be reduced.

〔実施形態1〕 図1は本発明の一実施形態を示す。この管路引き込み用複合管は、押出成形された樹脂製内管1の外周に、金属製の外傷防止用螺旋管2を設けたものである。外傷防止用螺旋管2は、両側縁が係合可能となるように断面略S字状に屈曲された金属テープ3を両側縁を係合させつつ螺旋状に巻回することにより形成したものである。このようにして形成された外傷防止用螺旋管2は、老朽管路内面のスケール等と擦れ合っても損傷を受け難く、しかも厚さが薄く、可撓性があるという利点がある。 Embodiment 1 FIG. 1 shows an embodiment of the present invention. This composite pipe for pulling in a pipe is provided with a metallic wound-preventing spiral tube 2 on the outer periphery of an extruded resin inner tube 1. The wound-preventing spiral tube 2 is formed by winding a metal tape 3 bent in a substantially S-shaped cross section so that both side edges can be engaged while spirally winding both side edges. is there. The wound-preventing spiral tube 2 formed in this way is advantageous in that it is not easily damaged even when it is rubbed against a scale on the inner surface of an old pipeline, and is thin and flexible.

樹脂製内管1は、ポリエチレンやナイロン等の熱可塑性樹脂を筒状(この例では円筒状)に押出成形することにより形成される。外傷防止用螺旋管2を構成する金属テープ3としてはステンレステープ、アルミ合金テープ等を使用することができる。   The resin inner pipe 1 is formed by extruding a thermoplastic resin such as polyethylene or nylon into a cylindrical shape (cylindrical in this example). As the metal tape 3 constituting the wound prevention spiral tube 2, a stainless steel tape, an aluminum alloy tape, or the like can be used.

筒状(円筒状)に押出成形された樹脂製内管1の外周に外傷防止用螺旋管2を設けると、外傷防止用螺旋管2が、樹脂製内管1の内圧補強層として機能し、また老朽管路へ引き込む時のテンションメンバーとしても機能するので、筒状内管1の強度と相まって高強度で外径の小さい管路引き込み用複合管を構成できる。   When the spiral tube 2 for preventing trauma is provided on the outer periphery of the resin inner tube 1 extruded into a cylindrical shape (cylindrical shape), the spiral tube 2 for preventing trauma functions as an internal pressure reinforcing layer of the resin inner tube 1, Moreover, since it functions also as a tension member at the time of drawing into an old pipe line, combined with the strength of the cylindrical inner pipe 1, a high-strength and small outer diameter pipe-drawing composite pipe can be configured.

また、外傷防止用螺旋管2は、管路に引き込むときに先端側になる方を硬度の高い金属テープで構成し、後端側になる方を先端側よりも硬度の低い金属テープで構成することが好ましい。このようにすると、外傷防止用螺旋管2の先端側は、老朽管路に引き込むときにスケールと擦れ合っても傷がつき難く、逆にスケールの突起を削り取る機能を発揮する。また外傷防止用螺旋管2の後端側は、先端側によってスケールの突起が削り取られた後に引き込まれるので、硬度が低くても傷がつき難い。また硬度の低い金属テープは硬度の高い金属テープよりも安価であるので、外傷防止用螺旋管2の全長を硬度の高い金属テープで構成する場合よりも、外傷防止用螺旋管2のコストを大幅に低減することができる。硬度の高い金属テープと硬度の低い金属テープは溶接により接続すればよい。   Further, the wound prevention spiral tube 2 is composed of a metal tape having a higher hardness at the front end side when drawn into the conduit, and a metal tape having a lower hardness than the front end side at the rear end side. It is preferable. In this way, the distal end side of the wound-preventing spiral tube 2 is less likely to be scratched even if it is rubbed against the scale when it is pulled into the old pipeline, and conversely exhibits a function of scraping off the scale protrusion. Further, since the rear end side of the wound preventing spiral tube 2 is drawn after the projections of the scale are scraped off by the front end side, it is difficult to be damaged even if the hardness is low. Moreover, since the metal tape with low hardness is less expensive than the metal tape with high hardness, the cost of the spiral tube 2 for preventing trauma is significantly higher than the case where the entire length of the spiral tube 2 for preventing trauma is composed of the metal tape with high hardness. Can be reduced. The metal tape with high hardness and the metal tape with low hardness may be connected by welding.

また、外傷防止用螺旋管2は、先端側で金属テープの硬度が最も高く、後端側へ行くに従い段階的に(3段階以上に)金属テープの硬度が低くなるように構成することが、より好ましい。   Further, the spiral tube 2 for preventing trauma is configured such that the hardness of the metal tape is the highest on the front end side, and the hardness of the metal tape is lowered stepwise (in three or more steps) toward the rear end side. More preferred.

〔実施形態2〕 図2は本発明の他の実施形態を示す。この管路引き込み用複合管は、押出成形された樹脂製内管1の外周に、保護テープ巻き層4、内圧補強層5、保護テープ巻き層6、防食層7、外傷防止用螺旋管2を順次設けたものである。樹脂製内管1及び外傷防止用螺旋管2の構成は実施形態1と同じである。 Embodiment 2 FIG. 2 shows another embodiment of the present invention. This composite pipe for drawing in a pipe has a protective tape winding layer 4, an internal pressure reinforcing layer 5, a protective tape winding layer 6, an anticorrosion layer 7, and a spiral pipe 2 for preventing damage on the outer periphery of the extruded resin inner pipe 1. They are provided sequentially. The configuration of the resin inner tube 1 and the wound preventing spiral tube 2 is the same as that of the first embodiment.

内圧補強層5は、金属テープ8をギャップ巻きすることにより形成される。金属テープ9のギャップ幅Gはテープ幅Wの5〜15%にすることが好ましい。図3はギャップ(%)(テープ幅Wに対するギャップ幅Gの割合)と、樹脂製内管1の内圧補強効率との関係を実験により求めた結果を示す。テープ幅Wに対するギャップ幅Gの割合が、5〜15%の範囲では補強効率0.85以上を確保できるが、25%以上になると補強効率が0.8以下に低下してしまうことが分かる。   The internal pressure reinforcing layer 5 is formed by winding the metal tape 8 with a gap. The gap width G of the metal tape 9 is preferably 5 to 15% of the tape width W. FIG. 3 shows the result of an experiment to determine the relationship between the gap (%) (the ratio of the gap width G to the tape width W) and the internal pressure reinforcement efficiency of the resin inner tube 1. It can be seen that when the ratio of the gap width G to the tape width W is in the range of 5 to 15%, a reinforcing efficiency of 0.85 or more can be secured, but when the ratio is 25% or more, the reinforcing efficiency decreases to 0.8 or less.

内圧補強層5は、金属テープ8を、層間でギャップの位置をずらして2層巻き又は3層巻きにして構成することが好ましいが、1層巻きでよい場合もある。   The internal pressure reinforcing layer 5 is preferably formed by winding the metal tape 8 in two layers or three layers by shifting the position of the gap between the layers.

防食層7は、内圧補強層5の腐食を防止するもので、ポリエチレン、ナイロン又はポリ塩化ビニル等の樹脂材料からなる。保護テープ巻き層4、6は、内圧補強層5の金属テープ8により樹脂製内管1及び防食層7が傷つくのを防止するためのものである。   The anticorrosion layer 7 prevents corrosion of the internal pressure reinforcing layer 5 and is made of a resin material such as polyethylene, nylon, or polyvinyl chloride. The protective tape winding layers 4 and 6 are for preventing the resin inner tube 1 and the anticorrosion layer 7 from being damaged by the metal tape 8 of the internal pressure reinforcing layer 5.

以上のような構成にすると、実施形態1と同様の効果が得られる上に、内圧補強層5及び防食層7を設けたことにより、腐食環境下でも内圧補強層5の腐食を防止することができ、長期にわたって内圧補強機能を維持することができる。   With the above configuration, the same effects as those of the first embodiment can be obtained, and the internal pressure reinforcing layer 5 and the anticorrosion layer 7 can be provided to prevent the internal pressure reinforcing layer 5 from corroding even in a corrosive environment. The internal pressure reinforcing function can be maintained over a long period of time.

〔実施形態3〕 図4は本発明のさらに他の実施形態を示す。この管路引き込み用複合管は、押出成形された樹脂製内管1の外周に、外傷防止用螺旋管2、保護テープ巻き層9、防食層10を順次設けたものである。樹脂製内管1及び外傷防止用螺旋管2の構成は実施形態1と同じである。 Embodiment 3 FIG. 4 shows still another embodiment of the present invention. This composite pipe for pulling in a pipe is obtained by sequentially providing a wound prevention spiral tube 2, a protective tape winding layer 9, and an anticorrosion layer 10 on the outer periphery of an extruded resin inner tube 1. The configuration of the resin inner tube 1 and the wound preventing spiral tube 2 is the same as that of the first embodiment.

このような構成にすると、老朽管路内に引き込むときに、防食層7がスケール等によって損傷するおそれがあるが、外傷防止用螺旋管2が損傷するおそれは少なくなり、防食層7が損傷しても、残存する防食層7によって外傷防止用螺旋管2の腐食を防止することができる。   With this configuration, the anticorrosion layer 7 may be damaged by a scale or the like when pulled into the old pipeline, but the risk of damage to the wound prevention spiral tube 2 is reduced, and the anticorrosion layer 7 is damaged. However, the remaining anticorrosive layer 7 can prevent corrosion of the wound preventing spiral tube 2.

〔実施形態4〕 図5は本発明のさらに他の実施形態を示す。この管路引き込み用複合管は、押出成形された樹脂製内管1の外周に、保護テープ巻き層4、内圧補強層5、保護テープ巻き層6、防食層7、外傷防止用螺旋管2、保護テープ巻き層9、防食層10を順次設けたものである。樹脂製内管1及び外傷防止用螺旋管2の構成は実施形態1と同じである。また、外傷防止用螺旋管2以内の構成は実施形態2と同じであり、それより外側の構成は実施形態3と同じである。 Embodiment 4 FIG. 5 shows still another embodiment of the present invention. This composite pipe for drawing in a pipe is formed on the outer periphery of an extruded resin inner pipe 1 with a protective tape winding layer 4, an internal pressure reinforcing layer 5, a protective tape winding layer 6, an anticorrosion layer 7, a wound prevention spiral pipe 2, A protective tape winding layer 9 and an anticorrosion layer 10 are sequentially provided. The configuration of the resin inner tube 1 and the wound preventing spiral tube 2 is the same as that of the first embodiment. Further, the configuration within the wound preventing spiral tube 2 is the same as that of the second embodiment, and the configuration outside thereof is the same as that of the third embodiment.

〔実施形態5〕 図6は本発明のさらに他の実施形態を示す。この管路引き込み用複合管は、最外層の防食層10の内側に長手方向に連続する外傷検知線11を設けたものである。外傷検知線11としては、金属パイプ12内に光ファイバ13を収納したものを使用することができる。このような外傷検知線11を設けておくと、防食層10が損傷を受けた場合、損傷箇所で光ファイバ13の伝送ロス増や断線が発生するので、OTDRでそれを検出し、損傷を受けたこと及び損傷箇所を確認することができる。 Embodiment 5 FIG. 6 shows still another embodiment of the present invention. This composite pipe for drawing a pipe is provided with a wound detection line 11 continuous in the longitudinal direction inside the outermost anticorrosion layer 10. As the wound detection line 11, a metal pipe 12 in which an optical fiber 13 is housed can be used. If such a damage detection line 11 is provided, if the anticorrosion layer 10 is damaged, an increase in transmission loss or disconnection of the optical fiber 13 occurs at the damaged portion, so that it is detected by OTDR and damaged. And the damaged part can be confirmed.

上記以外の構成は、図5に示した実施形態5と同じであるので、同一部分には同一符号を付して説明を省略する。   Since the configuration other than the above is the same as that of the fifth embodiment shown in FIG. 5, the same parts are denoted by the same reference numerals and the description thereof is omitted.

本発明に係る管路引き込み用複合管の一実施形態を示す、(A)は横断面図、(B)は(A)のB−B線拡大断面図。1A and 1B show an embodiment of a composite pipe for drawing a pipe according to the present invention, in which FIG. 1A is a cross-sectional view, and FIG. 本発明に係る管路引き込み用複合管の他の実施形態を示す、(A)は横断面図、(B)は(A)のB−B線拡大断面図。The other embodiment of the composite pipe for pipe drawing-in which concerns on this invention is shown, (A) is a cross-sectional view, (B) is the BB expanded sectional view of (A). 内圧補強層の金属テープをギャップ巻きしたときの、テープ幅に対するギャップ幅の割合と補強効率との関係を示すグラフ。The graph which shows the relationship between the ratio of the gap width with respect to tape width, and reinforcement efficiency when the metal tape of an internal pressure reinforcement layer is gap-wrapped. 本発明に係る管路引き込み用複合管のさらに他の実施形態を示す横断面図。The cross-sectional view which shows further another embodiment of the composite pipe for conduit drawing which concerns on this invention. 同じくさらに他の実施形態を示す横断面図。The cross-sectional view which shows other embodiment similarly. 同じくさらに他の実施形態を示す横断面図。The cross-sectional view which shows other embodiment similarly.

符号の説明Explanation of symbols

1:樹脂製内管
2:外傷防止用螺旋管
3:金属テープ
4:保護テープ巻き層
5:内圧補強層
6:保護テープ巻き層
7:防食層
8:金属テープ
9:保護テープ巻き層
10:防食層
11:外傷検知線
12:金属パイプ
13:光ファイバ
1: resin inner tube 2: spiral tube 3 for preventing damage: metal tape 4: protective tape winding layer 5: internal pressure reinforcing layer 6: protective tape winding layer 7: anticorrosion layer 8: metal tape 9: protective tape winding layer 10: Anticorrosion layer 11: Injury detection line 12: Metal pipe 13: Optical fiber

Claims (2)

押出成形された樹脂製内管の外側に、両側縁が係合可能となるように断面略S字状に屈曲された金属テープを両側縁を係合させつつ螺旋状に巻回することにより形成された外傷防止用螺旋管を配置したことを特徴とする管路引き込み用複合管。   Formed by spirally winding a metal tape that is bent in a substantially S-shaped cross section so that both side edges can be engaged on the outside of the extruded resin inner tube while engaging both side edges A composite pipe for pulling in a duct, characterized in that a spiral pipe for preventing trauma is arranged. 外傷防止用螺旋管は、管路に引き込むときに先端側になる方が硬度の高い金属テープで構成され、後端側になる方が先端側よりも硬度の低い金属テープで構成されていることを特徴とする請求項1記載の管路引き込み用複合管。   The spiral tube for preventing trauma should be composed of metal tape with higher hardness at the front end side when pulled into the conduit, and metal tape with lower hardness at the rear end side than the front end side. The composite pipe for pulling in a pipeline according to claim 1.
JP2006078030A 2006-03-22 2006-03-22 Composite tube for lining conduit Pending JP2007255479A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006078030A JP2007255479A (en) 2006-03-22 2006-03-22 Composite tube for lining conduit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006078030A JP2007255479A (en) 2006-03-22 2006-03-22 Composite tube for lining conduit

Publications (1)

Publication Number Publication Date
JP2007255479A true JP2007255479A (en) 2007-10-04

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JP2006078030A Pending JP2007255479A (en) 2006-03-22 2006-03-22 Composite tube for lining conduit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101307327B1 (en) * 2011-12-27 2013-09-10 (주) 세아그린텍 Anti-corrosion duct

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101307327B1 (en) * 2011-12-27 2013-09-10 (주) 세아그린텍 Anti-corrosion duct

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