JP2004290806A - Pipe interior lining pig - Google Patents

Pipe interior lining pig Download PDF

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Publication number
JP2004290806A
JP2004290806A JP2003086173A JP2003086173A JP2004290806A JP 2004290806 A JP2004290806 A JP 2004290806A JP 2003086173 A JP2003086173 A JP 2003086173A JP 2003086173 A JP2003086173 A JP 2003086173A JP 2004290806 A JP2004290806 A JP 2004290806A
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JP
Japan
Prior art keywords
diameter
pig
small
pipe
diameter pig
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
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JP2003086173A
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Japanese (ja)
Inventor
Tomohiro Shimojo
朝洋 下条
Takuji Ikeda
卓司 池田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osaka Gas Co Ltd
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Osaka Gas Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Osaka Gas Co Ltd filed Critical Osaka Gas Co Ltd
Priority to JP2003086173A priority Critical patent/JP2004290806A/en
Publication of JP2004290806A publication Critical patent/JP2004290806A/en
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  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the coated lining agent from being damaged during the withdrawal of a large-diameter pig though the pig is moved by traction with a wire. <P>SOLUTION: The pipe interior lining pig is one wherein a large diameter pig 1 for a large-diameter pipe A and a small-diameter pig 2 for a small-diameter pipe B are separably connected with each other, and a wire 3 for traction is passed through the pigs and wherein the pigs 1 and 2 are provided with their respective through-holes 1a and 2a for wire insertion, the wire 3 is passed through the through-holes 1a and 2a and is connected with the large-diameter pig 1 through a disengagement and engagement means 5 capable of being separated at a pulling power of a set value or larger and capable of engaging with the small-diameter pig 2, and a check valve 6 that prevents a pressurized fluid from flowing from the side of the small-diameter pig 2 is formed in the through-hole 1a of the large-diameter pig 1. In one embodiment, the pigs 1 and 2 are connected with each other so that they are separated from each other at a pulling power of a set value or larger, the small-diameter pig 2 in a separated state is capable of being pulled with the wire 3, and the large-diameter pig 1 is composed of a structure that prevents the pressurized fluid from flowing from the side of the small-diameter pig 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、大径管と小径管がほぼ同心状に接続されている配管の管内面にライニング剤を塗布するべく、前記大径管用の大径ピグと前記小径管用の小径ピグが分離可能な状態で連結され、前記小径ピグを前方に位置させてその小径ピグと前記大径ピグを牽引するための牽引用の通線が設けられている管内ライニング用ピグに関する。
【0002】
【従来の技術】
このような大径管と小径管がほぼ同心状に接続された配管用の管内ライニング用ピグとしては、従来、大径管用の大径ピグと小径管用の小径ピグが、一定張力以上で分離可能な連結部材、具体的には、金属製の事務用クリップにより互いに連結され、大径ピグと小径ピグにそれぞれ牽引用の通線を取り付けたものが知られている(例えば、特許文献1参照)。
【0003】
【特許文献1】
特開平10−57889号公報(図1、図2)
【0004】
【発明が解決しようとする課題】
この公報に示されたライニング用ピグによれば、小径ピグを進行方向前方に大径ピグを進行方向後方に位置させ、小径ピグに取り付けた通線を牽引して大径ピグにより大径管の内面にライニング剤を塗布し、大径ピグが小径管に引っ掛かって前方への進行が停止された状態で、その大径ピグから小径ピグを分離して、小径ピグにより小径管の内面にライニング剤を塗布することになる。
そして、小径ピグは、そのまま小径管に設けられた出口から回収され、大径管内に残された大径ピグは、その大径ピグに取り付けた通線による牽引で大径管を逆行させて、大径管に設けられた入口から回収することになる。
【0005】
この従来のライニング用ピグでは、ピグの移動を通線による牽引で行うので、例えば、ピグの移動方向前方に分岐管があっても、ピグをライニングの対象管に沿って所望どおりに移動させることができる。例えば、ピグの後方から圧縮流体を供給してピグを移動させるものでは、ピグが必ずしもライニングの対象管に沿って移動するとは限らず、誤って分岐管に入り込み分岐管に沿って移動する可能性もある。
その点、通線による牽引の場合、誤って分岐管の方に入り込むおそれはなく、圧縮流体による場合よりも優れているのであるが、その反面、大径ピグを回収するに際し、大径ピグに取り付けた通線の牽引により逆行させるので、その通線が大径管内面に塗布した後のライニング剤に接触して、ライニング剤の損傷を招くおそれがある。
【0006】
本発明は、このような従来の問題点に着目したもので、その目的は、ピグの移動を通線による牽引で行うにもかかわらず、大径ピグの回収に際して塗布後のライニング剤を損傷することのない管内ライニング用ピグを提供することである。
【0007】
【課題を解決するための手段】
請求項1の発明の特徴構成は、大径管と小径管がほぼ同心状に接続されている配管の管内面にライニング剤を塗布するべく、前記大径管用の大径ピグと前記小径管用の小径ピグが分離可能な状態で連結され、前記小径ピグを前方に位置させてその小径ピグと前記大径ピグを牽引するための牽引用の通線が設けられている管内ライニング用ピグであって、前記大径ピグと小径ピグが、前記通線挿通用の貫通孔を備え、前記通線が、両ピグの貫通孔を挿通して、設定値以上の引張り力により分離可能で、かつ、前記小径ピグに係合可能な分離係合手段を介して前記大径ピグに連結され、前記小径ピグ側からの加圧流体の通流を阻止する逆止弁が、前記大径ピグの貫通孔に設けられているところにある。
【0008】
請求項1の発明の特徴構成によれば、大径管用の大径ピグと小径管用の小径ピグが、両ピグを牽引するための通線挿通用の貫通孔を備え、その通線が、両ピグの貫通孔を挿通して、設定値以上の引張り力により分離可能で、かつ、小径ピグに係合可能な分離係合手段を介して大径ピグに連結されているので、大径管内面へのライニング剤の塗布に際しては、前記通線による牽引で両ピグを移動させることにより、たとえピグの移動方向前方に分岐管があっても、ライニング対象管に沿って確実に移動させて、大径ピグにより大径管内面にライニング剤を確実に塗布することができ、また、小径管内面へのライニング剤の塗布に際しては、小径ピグを大径ピグから分離して、小径ピグのみにより小径管内面にライニング剤を確実に塗布することができるとともに、その小径ピグを小径管に設けた出口から回収することができる。
そして、大径ピグの貫通孔には、小径ピグ側からの加圧流体の通流を阻止する逆止弁が設けられているので、大径管内に残された大径ピグの回収については、例えば、小径管に設けた出口から加圧空気などの加圧流体を供給することにより、その加圧流体の圧力で大径ピグを大径管に設けられた入口側へ逆行させて入口から回収することができる。
したがって、大径ピグの回収に際し、従来のように塗布後のライニング剤を通線により損傷するおそれもなく、大径ピグを安全に回収することができる。
【0009】
請求項2の発明の特徴構成は、前記分離係合手段が、前記通線の先端側に連結固定された弾性体を備え、前記大径ピグの貫通孔が、前記小径ピグの貫通孔よりも大径に形成されて、前記弾性体が、前記通線の設定値以上の引張り力による変形で前記大径ピグの貫通孔を通過して前記小径ピグの貫通孔に係合するように構成されているところにある。
【0010】
請求項2の発明の特徴構成によれば、分離係合手段が、通線の先端側に連結固定された弾性体を備え、大径ピグの貫通孔が、小径ピグの貫通孔よりも大径に形成されて、前記弾性体が、通線の設定値以上の引張り力による変形で大径ピグの貫通孔を通過して小径ピグの貫通孔に係合するように構成されているので、大径ピグが小径管に引っ掛かった状態で、牽引用の通線に設定値以上の引張り力を与えることにより、通線に連結固定された弾性体の変形により大径ピグと小径ピグの連結が確実に断たれ、かつ、小径ピグに対しては、小径ピグの貫通孔への弾性体の係合により通線が確実に連結され、その後の小径ピグの牽引を確実に実行することができる。
【0011】
請求項3の発明の特徴構成は、大径管と小径管がほぼ同心状に接続されている配管の管内面にライニング剤を塗布するべく、前記大径管用の大径ピグと前記小径管用の小径ピグが分離可能な状態で連結され、前記小径ピグを前方に位置させてその小径ピグと前記大径ピグを牽引するための牽引用の通線が設けられている管内ライニング用ピグであって、前記大径ピグと小径ピグが、設定値以上の引張り力により分離可能に連結され、かつ、前記大径ピグが分離された状態で、前記小径ピグが前記通線により牽引可能に構成され、前記大径ピグが、前記小径ピグ側からの加圧流体の通流を阻止する構造体で構成されているところにある。
【0012】
請求項3の発明の特徴構成によれば、大径管用の大径ピグと小径管用の小径ピグが、設定値以上の引張り力により分離可能に連結され、かつ、大径ピグが分離された状態で、小径ピグが牽引用の通線により牽引可能に構成されているので、上述した請求項1の発明と同様に、通線による牽引で両ピグを移動させることにより、ピグをライニング対象管に沿って確実に移動させて、大径ピグにより大径管内面にライニング剤を確実に塗布することができ、また、小径ピグを大径ピグから分離し、小径ピグのみにより小径管内面にライニング剤を確実に塗布することができ、その小径ピグを小径管に設けた出口から回収することができる。
そして、大径ピグ自体が、小径ピグ側からの加圧流体の通流を阻止する構造体で構成されているので、例えば、小径管に設けた出口から加圧空気などの加圧流体を供給することにより、その加圧流体の圧力で大径ピグを大径管に設けられた入口側へ逆行させて入口から回収することができ、この場合にも、大径ピグの回収に際し、従来のように塗布後のライニング剤を通線により損傷するおそれもなく、大径ピグを安全に回収することができる。
【0013】
請求項4の発明の特徴構成は、前記小径ピグが、前記通線挿通用の貫通孔を備え、前記通線が、その小径ピグの貫通孔を挿通して、設定値以上の引張り力により分離可能で、かつ、前記小径ピグに係合可能な分離係合手段を介して前記大径ピグに連結されているところにある。
【0014】
請求項4の発明の特徴構成によれば、小径ピグが、通線挿通用の貫通孔を備え、前記通線が、その小径ピグの貫通孔を挿通して、設定値以上の引張り力により分離可能で、かつ、小径ピグに係合可能な分離係合手段を介して大径ピグに連結されているので、大径ピグが小径管に引っ掛かった状態で、牽引用の通線に設定値以上の引張り力を与えることにより、大径ピグと小径ピグの連結が確実に断たれ、かつ、小径ピグに対しては、小径ピグへの分離係合手段の係合により通線が確実に連結され、その後の小径ピグの牽引を確実に実行することができる。
【0015】
請求項5の発明の特徴構成は、前記大径ピグと小径ピグが、設定値以上の引張り力で分離可能な連結手段を介して互いに連結され、前記通線が、前記小径ピグに連結固定されているところにある。
【0016】
請求項5の発明の特徴構成によれば、大径ピグと小径ピグが、設定値以上の引張り力で分離可能な連結手段を介して互いに連結され、前記通線が、小径ピグに連結固定されているので、この場合にも、大径ピグが小径管に引っ掛かった状態で、牽引用の通線に設定値以上の引張り力を与えることにより、大径ピグと小径ピグの連結が確実に断たれ、その後、小径ピグは、小径ピグに連結固定された通線により確実に牽引される。
【0017】
請求項6の発明の特徴構成は、前記大径ピグが、断面ほぼ円形の筒状または柱状に構成されているところにある。
【0018】
請求項6の発明の特徴構成によれば、大径ピグが、断面ほぼ円形の筒状または柱状に構成されているので、例えば、大径ピグを球状に構成する場合のように自由に回転することができず、したがって、大径ピグの回収に際し、例えば、大径ピグに設けた逆止弁、分離係合手段、または、連結手段の部品などが塗布後のライニング剤に接触するのを確実に回避することができる。
【0019】
【発明の実施の形態】
本発明による管内ライニング用ピグの実施の形態を図面に基づいて説明する。
この管内ライニング用ピグは、例えば、地中に埋設された既設のガス管の内面にライニング剤を塗布する際に使用するもので、特に、図2などに示すように、大径管Aと小径管Bが異径の継手管Cを介してほぼ同心状に接続されている配管において、エポキシ樹脂などの未硬化樹脂からなるライニング剤Dを大径管Aと小径管Bおよび継手管Cの管内面に塗布するのに使用するものである。
そのため、ライニング用ピグは、図1、図4、および、図6に示すように、大径管Aの内面にライニング剤Dを塗布するための大径管用の大径ピグ1と小径管Bの内面にライニング剤Dを塗布するための小径管用の小径ピグ2を備え、小径ピグ2を進行方向前方に大径ピグ1を進行方向後方に位置させて移動させるように構成されている。
【0020】
[第1の実施形態]
第1の実施形態では、大径ピグ1と小径ピグ2が、金属、ゴム、あるいは、合成樹脂などの比較的硬い材料により形成され、図1および図2に示すように、大径ピグ1は、その中心に貫通孔1aを有する断面ほぼ円形の筒状体に構成され、小径ピグ2は、球状体に構成されて、その中心を通る貫通孔2aが設けられ、大径ピグ1の貫通孔1aの方が、小径ピグ2の貫通孔2aよりも大径の貫通孔に構成されている。
両ピグ1,2の貫通孔1a,2aは、ピグ牽引用の通線3を挿通するためのもので、両貫通孔1a,2aに挿通された通線3の端部、すなわち、両貫通孔1a,2aを挿通して大径ピグ1の後方に延出された端部には、弾性変形により縮径する弾性体4が連結固定されている。
【0021】
この弾性体4は、通常、図2の(イ)に示すように、大径ピグ1の貫通孔1aに係合して、通線3を大径ピグ1に連結する機能を有し、大径ピグ1が停止した状態で通線3に設定値以上の引張り力が作用すると、図2の(ロ)に示すように、弾性体4が弾性変形により縮径して大径ピグ1の貫通孔1a内を通過し、図2の(ハ)に示すように、小径ピグ2の貫通孔2aに係合して、通線3を小径ピグ2に連結する機能を有する。
換言すると、弾性体4、大径ピグ1の貫通孔1a、および、小径ピグ2の貫通孔2aが分離係合手段5を構成し、その分離係合手段5が、通線3に設定値以上の引張り力が作用すると、大径ピグ1と小径ピグ2を互いに分離するとともに、小径ピグ2に係合して通線3を小径ピグ2に連結するように構成されている。
【0022】
大径ピグ1には、貫通孔1aの後端側に貫通孔1aより大径の円形段部1bが設けられて、その円形段部1b内に貫通孔1aとほぼ同径の貫通孔を有する円筒体6aが内嵌されるとともに、円筒体6aと円形段部1bと間に可撓性材料からなる弁体6bの脚部が挟みこまれて、円筒体6aと弁体6bが大径ピグ1に固定されている。
この円筒体6aと弁体6bは、小径ピグ2側からの加圧流体の通流を阻止する逆止弁6を構成するもので、このような構成の逆止弁6が、大径ピグ1の貫通孔1aに設けられている。
【0023】
つぎに、この第1の実施形態によるライニング用ピグを使用して大径管Aと小径管Bの内面にライニング剤Dを塗布する方法について説明する。
まず、図3の(イ)に示すように、大径管Aと小径管Bを適当な箇所で切断して、大径管A側に入口aを形成し、小径管B側に出口bを形成して、通線3を入口aから出口bにわたって通した後、入口aからライニングに必要な量のライニング剤Dを挿入する。
そのライニング剤Dの後方側において、小径ピグ2を進行方向前方側、つまり、小径管B側に位置させて小径ピグ2と大径ピグ1を大径管A内に挿入し、出口b側に設置した牽引装置7により通線3を牽引して、両ピグ1,2を小径管B側に向けて移動させ、大径ピグ1によりライニング剤Dを大径管Bの内面に塗布する。
【0024】
両ピグ1,2が継手管C部分に到達すると、図3の(ロ)に示すように、大径ピグ1が小径管Bに引っ掛かって停止するので、通線3に作用する引張り力が徐々に大きくなり、その引張り力が設定値に達すると、図2の(ロ)と(ハ)に示したように、弾性体4が弾性変形により縮径して大径ピグ1の貫通孔1a内を通過し、小径ピグ2の貫通孔2aに係合する。
その時点で、小径ピグ2は大径ピグ1から分離し、図3の(ハ)に示すように、通線3による牽引で小径管Bを出口b側に向けて移動し、ライニング剤Dを小径管Bの内面に塗布するのであり、その小径ピグ2と余剰のライニング剤Dは出口bから回収される。
その後、図3の(ニ)に示すように、小径管Bの出口bに作業用治具8を介して加圧空気用の供給ホース9を接続し、供給ホース9から加圧空気を供給する。それにより逆止弁6が閉弁するので、大径管A内に残された大径ピグ1は、その加圧空気の圧力で入口aに向けて逆行されて入口aから回収される。
【0025】
[第2の実施形態]
第2の実施形態でも、第1の実施形態と同様に、大径ピグ1と小径ピグ2は、金属、ゴム、あるいは、合成樹脂などの比較的硬い材料により形成され、図4および図5に示すように、小径ピグ2は、その中心を通る貫通孔2aを有する球状体に構成されている。
しかし、大径ピグ1の方は、貫通孔1aのない断面ほぼ円形の柱状体、換言すると、小径ピグ2側からの加圧流体の通流を阻止する構造体に構成され、その前端部に形成された凹入部1c内に金属製の円環10aが取り付けられている。
そして、小径ピグ2の貫通孔2aに挿通された通線3の端部、すなわち、貫通孔2aを挿通して小径ピグ2の後方に延出された端部には、針金により構成されたストッパ付きフック10bが連結固定されて、そのフック10bが円環10aに係合されている。
【0026】
このフック10bは、通常、図5の(イ)に示すように、大径ピグ1の円環10aに係合して、通線3を大径ピグ1に連結する機能を有し、大径ピグ1が停止した状態で通線3に設定値以上の引張り力が作用すると、図5の(ロ)に示すように、フック10bが弾性変形により伸びて大径ピグ1への係合を解除し、その後、小径ピグ2の貫通孔2aに係合して、通線3を小径ピグ2に連結する機能を有する。
換言すると、円環10a、フック10b、および、小径ピグ2の貫通孔2aが分離係合手段11を構成し、その分離係合手段11が、通線3に設定値以上の引張り力が作用すると、大径ピグ1と小径ピグ2を互いに分離するとともに、小径ピグ2に係合して通線3を小径ピグ2に連結するように構成されている。
【0027】
また、図6および図7は、第2の実施形態の変形例を示すもので、この変形例においては、設定値以上の引張り力で伸びるフック10bが、小径ピグ2に直接取り付けられ、そのフック10bの取り付け位置と反対側の部位において、通線3が小径ピグ2に連結固定されている。
したがって、小径ピグ2には貫通孔2aがなく、大径ピグ1に取り付けられた円環10aと小径ピグ2に取り付けられたフック10bが、設定値以上の引張り力で互いに分離する連結手段12を構成する。
なお、他の構成については、第2の実施形態と特に変わるところはないので、同じ符号を付すことで、その説明を省略する。
【0028】
この第2の実施形態とその変形例によるライニング用ピグを使用して大径管Aと小径管Bの内面にライニング剤Dを塗布する方法は、先の第1の実施形態の場合とほぼ同じである。
すなわち、大径管Aと小径管Bを切断し、大径管A側に入口aを小径管B側に出口bを形成して、入口aからライニング剤Dを挿入した後、小径ピグ2を進行方向前方側に位置させて牽引装置7により通線3を牽引して、大径ピグ1によりライニング剤Dを大径管Bの内面に塗布する。
図5の(イ)および図7の(イ)に示すように、大径ピグ1が小径管Bに引っ掛かって停止し、通線3に作用する引張り力が徐々に大きくなって設定値に達すると、第2の実施形態では、図5の(ロ)に示すように、通線3の端部に連結固定したフック10bが、その変形例では、図7の(ロ)に示すように、小径ピグ2に取り付けたフック10bが、それぞれ弾性変形により伸びて円環10aから外れて、小径ピグ2が大径ピグ1から分離する。
【0029】
その後、第2の実施形態では、円環10aから外れた通線3先端のフック10bが小径ピグ2の貫通孔2bに係合して牽引し、その変形例では、小径ピグ2に連結固定された通線3が牽引して、小径ピグ2を小径管Bの出口b側に向けて移動しながら、ライニング剤Dを小径管Bの内面に塗布するのであり、小径ピグ2と余剰のライニング剤Dは出口bから回収される。
その後は第1の実施形態と同様、小径管Bの出口bに作業用治具8を介して加圧空気用の供給ホース9を接続し、供給ホース9から加圧空気を供給する。第2の実施形態とその変形例では、大径ピグ1自体が加圧流体の通流を阻止する構造体に構成されているので、大径管A内に残された大径ピグ1は、その加圧空気の圧力で入口aに向けて逆行されて入口aから回収される。
【0030】
〔別実施形態〕
(1)第1の実施形態では、設定値以上の引張り力が作用すると、弾性変形により縮径する弾性体4を使用して分離係合手段5を構成した例を示したが、その弾性体4に代えて、例えば、設定以上の引張り力の作用で破損して大径ピグ1への連結を解除する係合具などを使用することもできる。
【0031】
(2)第2の実施形態とその変形例では、大径ピグ1を中実の円柱状に構成した例を示したが、小径ピグ2側からの加圧流体の通流を阻止する構造体であればよく、したがって、例えば、有底の円筒状に構成することもできる。
また、第2実施形態における分離係合手段11とその変形例における連結手段12に関しては、特に円環10aとフック10bに限るものではなく、種々の構成を採用することができる。
【0032】
(3)さらに、いずれの実施形態においても、ライニングの対象となる配管は、特にガス管に限るものではなく、各種の流体を通流する種々の配管に適用することができる。
【図面の簡単な説明】
【図1】第1の実施形態によるライニング用ピグの斜視図
【図2】第1の実施形態によるライニング用ピグの作用を示す断面図
【図3】第1の実施形態によるライニング用ピグの使用状態を示す断面図
【図4】第2の実施形態によるライニング用ピグの斜視図
【図5】第2の実施形態によるライニング用ピグの作用を示す断面図
【図6】第2の実施形態の変形例によるライニング用ピグの斜視図
【図7】第2の実施形態の変形例によるライニング用ピグの作用を示す断面図
【符号の説明】
1 大径ピグ
1a 大径ピグの貫通孔
2 小径ピグ
2a 小径ピグの貫通孔
3 通線
4 弾性体
5 分離係合手段
6 逆止弁
11 分離係合手段
12 連結手段
A 大径管
B 小径管
D ライニング剤
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention can separate the large-diameter pig for the large-diameter pig and the small-diameter pig for the small-diameter pipe in order to apply a lining agent to the inner surface of the pipe in which the large-diameter pipe and the small-diameter pipe are connected substantially concentrically. The present invention relates to a pig for lining in a pipe, which is connected in a state, and is provided with a towing line for pulling the small-diameter pig and the large-diameter pig by positioning the small-diameter pig forward.
[0002]
[Prior art]
Conventionally, a large-diameter pig and a small-diameter pig for a small-diameter pipe can be separated at a certain tension or more as the inside-pig lining pig for a pipe in which the large-diameter pipe and the small-diameter pipe are connected almost concentrically. There are known connecting members which are connected to each other by a metal office clip, specifically, large-diameter pigs and small-diameter pigs are provided with towing lines (for example, see Patent Document 1). .
[0003]
[Patent Document 1]
JP-A-10-57889 (FIGS. 1 and 2)
[0004]
[Problems to be solved by the invention]
According to the pig for lining shown in this publication, the small-diameter pig is positioned forward in the traveling direction, the large-diameter pig is positioned in the rear in the traveling direction, and the line attached to the small-diameter pig is pulled to form the large-diameter pipe by the large-diameter pig. Apply a lining agent to the inner surface, and separate the small-diameter pig from the large-diameter pig with the large-diameter pig caught by the small-diameter tube and stop moving forward, and use the small-diameter pig to coat the lining agent on the inner surface of the small-diameter tube. Will be applied.
Then, the small-diameter pig is recovered from the outlet provided in the small-diameter pipe as it is, and the large-diameter pig left in the large-diameter pipe is caused to reverse the large-diameter pipe by pulling through the wire attached to the large-diameter pig, It will be collected from the inlet provided in the large diameter pipe.
[0005]
In the conventional pig for lining, since the movement of the pig is performed by pulling through the line, for example, even if there is a branch pipe in the forward direction of the pig, the pig can be moved as desired along the target pipe of the lining. Can be. For example, when the pig is moved by supplying compressed fluid from the rear of the pig, the pig does not necessarily move along the target pipe of the lining, but may accidentally enter the branch pipe and move along the branch pipe. There is also.
On the other hand, in the case of towing by a traffic line, there is no risk of accidentally entering the branch pipe, and it is superior to the case of using compressed fluid, but on the other hand, when collecting large diameter pigs, Since the installed wire is pulled backward by pulling the wire, the wire may come into contact with the lining agent applied to the inner surface of the large-diameter pipe, and the lining agent may be damaged.
[0006]
The present invention focuses on such a conventional problem, and its purpose is to damage the lining agent after application when collecting a large-diameter pig, despite the fact that the pig is moved by pulling through the line. It is an object of the present invention to provide an in-pipe lining pig that does not have any problem.
[0007]
[Means for Solving the Problems]
The feature of the invention according to claim 1 is that, in order to apply a lining agent to the inner surface of the pipe in which the large-diameter pipe and the small-diameter pipe are connected almost concentrically, the large-diameter pig and the small-diameter pipe are used. A small-sized pig is connected in a separable state, and a pipe for lining in a pipe in which the small-diameter pig is located in front and a towing line for pulling the small-diameter pig and the large-diameter pig is provided. The large-diameter pig and the small-diameter pig are provided with through-holes for the through-line insertion, and the through-line is inserted through the through-holes of both pigs, and can be separated by a tensile force equal to or more than a set value, and A check valve, which is connected to the large-diameter pig via separation engagement means capable of engaging with the small-diameter pig and prevents the flow of pressurized fluid from the small-diameter pig side, is provided in a through hole of the large-diameter pig. It is provided.
[0008]
According to the characteristic configuration of the invention of claim 1, the large-diameter pig for the large-diameter pipe and the small-diameter pig for the small-diameter pipe are provided with through-holes for through-hole insertion for pulling both pigs. The inner surface of the large-diameter pipe can be inserted through the through-hole of the pig and separated from the large-diameter pig through separation engaging means that can be separated by a tensile force equal to or greater than the set value and that can engage the small-diameter pig. When applying the lining agent to the lining agent, the two pigs are moved by pulling by the above-mentioned traffic lines, so that even if there is a branch pipe in the forward direction of the pig, the pig is surely moved along the pipe to be lined. The diameter pig allows the lining agent to be reliably applied to the inner surface of the large-diameter tube.When applying the lining agent to the inner surface of the small-diameter tube, the small-diameter pig is separated from the large-diameter pig, and only the small-diameter pig is used. Make sure that the lining agent is applied to the surface It is possible, it is possible to recover the small pig from an outlet provided in the small diameter tube.
And, in the through hole of the large-diameter pig, a check valve for preventing the flow of the pressurized fluid from the small-diameter pig side is provided, so for collection of the large-diameter pig left in the large-diameter pipe, For example, by supplying a pressurized fluid such as pressurized air from the outlet provided in the small-diameter pipe, the pressure of the pressurized fluid causes the large-diameter pig to move backward to the inlet side provided in the large-diameter pipe and be recovered from the inlet. can do.
Therefore, when collecting the large-diameter pig, the large-diameter pig can be safely recovered without the risk of damage due to the passage of the lining agent after application as in the related art.
[0009]
The feature configuration of the invention according to claim 2 is that the separation engaging means includes an elastic body connected and fixed to a distal end side of the communication line, and the through hole of the large diameter pig is larger than the through hole of the small diameter pig. The elastic body is formed to have a large diameter, and the elastic body is configured to pass through the through-hole of the large-diameter pig and engage with the through-hole of the small-diameter pig by a deformation due to a tensile force equal to or greater than a set value of the through line. Where it is.
[0010]
According to the characteristic configuration of the invention of claim 2, the separation engagement means includes an elastic body fixedly connected to the leading end side of the communication line, and the through hole of the large diameter pig is larger in diameter than the through hole of the small diameter pig. Since the elastic body is configured to pass through the through-hole of the large-diameter pig and to engage with the through-hole of the small-diameter pig by deformation due to a tensile force equal to or greater than the set value of the wire, When the diameter pig is hooked on the small-diameter pipe, a tensile force greater than the set value is applied to the tow line, and the large- and small-diameter pigs are securely connected due to the deformation of the elastic body connected and fixed to the line. The small-diameter pig is connected to the small-diameter pig, and the elastic wire is engaged with the through-hole of the small-diameter pig, whereby the through-line is reliably connected, and the subsequent towing of the small-diameter pig can be reliably performed.
[0011]
The characteristic configuration of the invention according to claim 3 is that the large-diameter pipe and the small-diameter pipe have a large-diameter pig and a small-diameter pipe for applying a lining agent to the inner surface of the pipe in which the large-diameter pipe and the small-diameter pipe are connected substantially concentrically. A small-sized pig is connected in a separable state, and a pipe for lining in a pipe in which the small-diameter pig is located in front and a towing line for pulling the small-diameter pig and the large-diameter pig is provided. The large-diameter pig and the small-diameter pig are separably connected by a tensile force equal to or greater than a set value, and in a state where the large-diameter pig is separated, the small-diameter pig is configured to be towable by the through-line, The large-diameter pig is constituted by a structure that blocks flow of pressurized fluid from the small-diameter pig side.
[0012]
According to the characteristic configuration of the invention of claim 3, the large-diameter pig for the large-diameter pipe and the small-diameter pig for the small-diameter pipe are connected so as to be separable by a tensile force equal to or greater than a set value, and the large-diameter pig is separated. Then, since the small-diameter pig is configured to be towable by a tow line, the pig is moved to the lining target pipe by moving both pigs by the tow line as in the first aspect of the present invention. Along with the large-diameter pig to reliably apply the lining agent to the inner surface of the large-diameter pipe.Also, separate the small-diameter pig from the large-diameter pig, and apply the lining agent to the inner surface of the small-diameter pipe using only the small-diameter pig. Can be reliably applied, and the small-diameter pig can be collected from an outlet provided in the small-diameter pipe.
Since the large-diameter pig itself is constituted by a structure that blocks the flow of the pressurized fluid from the small-diameter pig side, for example, a pressurized fluid such as pressurized air is supplied from an outlet provided in the small-diameter pipe. By doing so, it is possible to reverse the large-diameter pig to the inlet side provided in the large-diameter pipe by the pressure of the pressurized fluid and collect it from the inlet, and in this case, when collecting the large-diameter pig, the conventional method is used. As described above, the large-diameter pig can be safely recovered without the risk of damage due to the passage of the lining agent after application.
[0013]
The characteristic configuration of the invention according to claim 4 is that the small-diameter pig has the through-hole for inserting the through-hole, and the through-line is inserted through the through-hole of the small-diameter pig, and is separated by a tensile force equal to or more than a set value. It is possible and is connected to the large diameter pig via separation engagement means capable of engaging with the small diameter pig.
[0014]
According to the characteristic configuration of the invention of claim 4, the small-diameter pig is provided with a through-hole for through-hole insertion, and the through-line is inserted through the through-hole of the small-diameter pig and separated by a tensile force equal to or greater than a set value. It is possible and connected to the large-diameter pig via the separating engagement means that can engage the small-diameter pig. By applying a tensile force, the connection between the large-diameter pig and the small-diameter pig is reliably cut off, and for the small-diameter pig, the through wire is reliably connected by the engagement of the separating engagement means to the small-diameter pig. Therefore, the towing of the small-diameter pig thereafter can be reliably performed.
[0015]
A feature of the invention according to claim 5 is that the large-diameter pig and the small-diameter pig are connected to each other via a connecting means that can be separated by a tensile force equal to or greater than a set value, and the through-line is connected and fixed to the small-diameter pig. Where it is.
[0016]
According to the characteristic configuration of the invention of claim 5, the large-diameter pig and the small-diameter pig are connected to each other via a connecting means that can be separated by a tensile force equal to or greater than a set value, and the through-wire is connected and fixed to the small-diameter pig. In this case as well, when the large-diameter pig is hooked on the small-diameter pipe, the connection between the large-diameter pig and the small-diameter pig is securely disconnected by applying a tensile force greater than the set value to the towing line. After that, the small-diameter pig is reliably pulled by the wire fixedly connected to the small-diameter pig.
[0017]
A feature of the invention according to claim 6 is that the large-diameter pig is formed in a cylindrical or columnar shape having a substantially circular cross section.
[0018]
According to the characteristic configuration of the invention of claim 6, since the large-diameter pig is formed in a cylindrical or columnar shape having a substantially circular cross section, it freely rotates, for example, when the large-diameter pig is formed in a spherical shape. Therefore, when collecting the large-diameter pig, for example, it is necessary to ensure that the check valve, the separation engagement means, or the part of the connecting means provided on the large-diameter pig comes into contact with the applied lining agent. Can be avoided.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a pipe lining pig according to the present invention will be described with reference to the drawings.
The in-pipe lining pig is used, for example, when a lining agent is applied to the inner surface of an existing gas pipe buried underground. In particular, as shown in FIG. In a pipe in which the pipe B is connected substantially concentrically via a joint pipe C having a different diameter, a lining agent D made of an uncured resin such as an epoxy resin is applied to the inside of the large-diameter pipe A, the small-diameter pipe B, and the joint pipe C. It is used to apply to the surface.
Therefore, as shown in FIGS. 1, 4 and 6, the lining pig is composed of a large-diameter pig 1 and a small-diameter pipe B for applying a lining agent D to the inner surface of the large-diameter pipe A. A small-diameter pig 2 for a small-diameter pipe for applying the lining agent D to the inner surface is provided, and the small-diameter pig 2 is configured to be moved forward with the large-diameter pig 1 positioned rearward in the traveling direction.
[0020]
[First Embodiment]
In the first embodiment, the large-diameter pig 1 and the small-diameter pig 2 are formed of a relatively hard material such as a metal, rubber, or a synthetic resin. As shown in FIGS. The small-diameter pig 2 is formed into a spherical body having a through-hole 1a at the center thereof, the small-diameter pig 2 is formed into a spherical body, a through-hole 2a passing through the center thereof is provided, and the through-hole of the large-diameter pig 1 is provided. 1a is configured as a larger diameter through hole than the small diameter pig 2 through hole 2a.
The through-holes 1a and 2a of the pigs 1 and 2 are for inserting the through-holes 3 for towing the pig, and the ends of the through-holes 3 inserted into the through-holes 1a and 2a, that is, the two through-holes. An elastic body 4 whose diameter is reduced by elastic deformation is connected and fixed to an end portion of the large-diameter pig 1 that extends rearward through the first and second pigs 1a and 2a.
[0021]
This elastic body 4 usually has a function of engaging the through hole 1a of the large-diameter pig 1 to connect the through wire 3 to the large-diameter pig 1 as shown in FIG. When a tensile force equal to or greater than the set value acts on the wire 3 while the diameter pig 1 is stopped, the elastic body 4 is reduced in diameter by elastic deformation and penetrates the large diameter pig 1 as shown in FIG. It has a function of passing through the hole 1a and engaging with the through hole 2a of the small diameter pig 2 as shown in FIG.
In other words, the elastic body 4, the through-hole 1 a of the large-diameter pig 1, and the through-hole 2 a of the small-diameter pig 2 constitute the separating and engaging means 5, and the separating and engaging means 5 is connected to the communication line 3 by a set value or more. When the pulling force is applied, the large-diameter pig 1 and the small-diameter pig 2 are separated from each other, and the small-diameter pig 2 is engaged with the large-diameter pig 1 to connect the through wire 3 to the small-diameter pig 2.
[0022]
The large-diameter pig 1 is provided with a circular step portion 1b having a diameter larger than that of the through hole 1a on the rear end side of the through hole 1a, and has a through hole having substantially the same diameter as the through hole 1a in the circular step portion 1b. The cylindrical body 6a is fitted inside, and the leg of the valve body 6b made of a flexible material is sandwiched between the cylindrical body 6a and the circular step portion 1b. It is fixed to 1.
The cylindrical body 6a and the valve body 6b constitute a check valve 6 for preventing the flow of the pressurized fluid from the small-diameter pig 2 side. Is provided in the through hole 1a.
[0023]
Next, a method of applying the lining agent D to the inner surfaces of the large-diameter pipe A and the small-diameter pipe B using the lining pig according to the first embodiment will be described.
First, as shown in FIG. 3A, the large-diameter pipe A and the small-diameter pipe B are cut at appropriate places, an inlet a is formed on the large-diameter pipe A side, and an outlet b is formed on the small-diameter pipe B side. After forming and passing the wire 3 from the inlet a to the outlet b, an amount of the lining agent D necessary for lining is inserted from the inlet a.
On the rear side of the lining agent D, the small-diameter pig 2 is positioned on the front side in the traveling direction, that is, on the small-diameter pipe B side, and the small-diameter pig 2 and the large-diameter pig 1 are inserted into the large-diameter pipe A, and the exit b side is The line 3 is pulled by the installed pulling device 7 to move the two pigs 1 and 2 toward the small-diameter pipe B, and the lining agent D is applied to the inner surface of the large-diameter pipe B by the large-diameter pig 1.
[0024]
When the two pigs 1 and 2 reach the joint pipe C portion, as shown in FIG. 3B, the large-diameter pig 1 is hooked on the small-diameter pipe B and stops, so that the tensile force acting on the wire 3 gradually decreases. When the tensile force reaches a set value, the elastic body 4 is reduced in diameter by elastic deformation, as shown in (b) and (c) of FIG. And engages with the through hole 2a of the small-diameter pig 2.
At that time, the small-diameter pig 2 is separated from the large-diameter pig 1, and as shown in FIG. 3C, the small-diameter pipe B is moved toward the outlet b by traction by the wire 3, and the lining agent D is removed. It is applied to the inner surface of the small diameter pipe B, and the small diameter pig 2 and excess lining agent D are collected from the outlet b.
Thereafter, as shown in FIG. 3D, a supply hose 9 for pressurized air is connected to the outlet b of the small-diameter pipe B via a work jig 8, and pressurized air is supplied from the supply hose 9. . As a result, the check valve 6 is closed, so that the large-diameter pig 1 left in the large-diameter pipe A is moved backward toward the inlet a by the pressure of the pressurized air and collected from the inlet a.
[0025]
[Second embodiment]
In the second embodiment, as in the first embodiment, the large-diameter pig 1 and the small-diameter pig 2 are formed of a relatively hard material such as metal, rubber, or synthetic resin. As shown, the small-diameter pig 2 is formed into a spherical body having a through hole 2a passing through the center thereof.
However, the large-diameter pig 1 is constituted by a columnar body having a substantially circular cross section without the through-hole 1a, in other words, a structure that blocks the flow of the pressurized fluid from the small-diameter pig 2 side, and is provided at the front end thereof. A metal ring 10a is mounted in the formed recess 1c.
The end of the wire 3 inserted into the through hole 2a of the small-diameter pig 2, that is, the end that extends through the through hole 2a and extends rearward of the small-diameter pig 2, is provided with a stopper made of a wire. The hook 10b is connected and fixed, and the hook 10b is engaged with the ring 10a.
[0026]
This hook 10b normally has a function of engaging the ring 10a of the large diameter pig 1 to connect the through wire 3 to the large diameter pig 1 as shown in FIG. When a tensile force equal to or greater than the set value is applied to the wire 3 while the pig 1 is stopped, the hook 10b is extended by elastic deformation to release the engagement with the large-diameter pig 1, as shown in FIG. After that, it has a function of engaging the through hole 2a of the small diameter pig 2 to connect the through wire 3 to the small diameter pig 2.
In other words, when the ring 10 a, the hook 10 b, and the through hole 2 a of the small-diameter pig 2 constitute the separating and engaging means 11, and the separating and engaging means 11 exerts a tensile force equal to or more than the set value on the through wire 3. The large-diameter pig 1 and the small-diameter pig 2 are separated from each other, and the small-diameter pig 2 is engaged with the large-diameter pig 1 to connect the through wire 3 to the small-diameter pig 2.
[0027]
FIGS. 6 and 7 show a modification of the second embodiment. In this modification, a hook 10b extending with a tensile force equal to or greater than a set value is directly attached to the small-diameter pig 2, and The wire 3 is connected and fixed to the small-diameter pig 2 at a position opposite to the mounting position of 10b.
Therefore, the small-diameter pig 2 does not have the through hole 2a, and the ring 10a attached to the large-diameter pig 1 and the hook 10b attached to the small-diameter pig 2 form the connecting means 12 that separates each other with a tensile force equal to or more than a set value. Constitute.
Note that the other components are not particularly different from those of the second embodiment.
[0028]
The method of applying the lining agent D to the inner surfaces of the large-diameter pipe A and the small-diameter pipe B by using the lining pig according to the second embodiment and its modified example is almost the same as in the first embodiment. It is.
That is, the large-diameter pipe A and the small-diameter pipe B are cut, the inlet a is formed on the large-diameter pipe A side, the outlet b is formed on the small-diameter pipe B side, and the lining agent D is inserted from the inlet a. The lining agent D is applied to the inner surface of the large-diameter pipe B by the large-diameter pig 1 by pulling the through line 3 by the traction device 7 while being positioned on the front side in the traveling direction.
As shown in FIGS. 5A and 7A, the large-diameter pig 1 is caught by the small-diameter pipe B and stops, and the pulling force acting on the wire 3 gradually increases to reach the set value. Then, in the second embodiment, as shown in (b) of FIG. 5, the hook 10b connected and fixed to the end of the communication line 3 is, as shown in (b) of FIG. The hooks 10b attached to the small-diameter pig 2 are respectively extended by elastic deformation and come off from the ring 10a, and the small-diameter pig 2 is separated from the large-diameter pig 1.
[0029]
After that, in the second embodiment, the hook 10b at the tip of the through wire 3 that is disengaged from the ring 10a engages with the through-hole 2b of the small-diameter pig 2 and is pulled, and in the modified example, is connected and fixed to the small-diameter pig 2. The lining agent D is applied to the inner surface of the small-diameter pipe B while the small-diameter pig 2 is moved toward the outlet b side of the small-diameter pipe B by pulling the passing wire 3 to pull the small-diameter pig 2 and excess lining agent. D is recovered from outlet b.
Thereafter, similarly to the first embodiment, a supply hose 9 for pressurized air is connected to the outlet b of the small-diameter pipe B via a work jig 8, and pressurized air is supplied from the supply hose 9. In the second embodiment and its modified example, since the large-diameter pig 1 itself is configured as a structure that blocks the flow of the pressurized fluid, the large-diameter pig 1 left in the large-diameter pipe A is: The air is returned toward the inlet a by the pressure of the pressurized air and collected from the inlet a.
[0030]
[Another embodiment]
(1) In the first embodiment, an example is shown in which the separating and engaging means 5 is configured by using the elastic body 4 whose diameter is reduced by elastic deformation when a tensile force equal to or more than the set value is applied. Instead of 4, for example, it is also possible to use an engaging tool or the like that breaks due to the action of a tensile force greater than the setting and releases the connection to the large-diameter pig 1.
[0031]
(2) In the second embodiment and its modified example, the example in which the large-diameter pig 1 is formed in a solid cylindrical shape has been described, but a structure for preventing the flow of the pressurized fluid from the small-diameter pig 2 side. Therefore, for example, it may be configured in a bottomed cylindrical shape.
Further, the separating and engaging means 11 in the second embodiment and the connecting means 12 in the modification thereof are not particularly limited to the ring 10a and the hook 10b, and various configurations can be adopted.
[0032]
(3) Further, in any of the embodiments, the piping to be lined is not particularly limited to a gas pipe, and can be applied to various pipings through which various fluids flow.
[Brief description of the drawings]
FIG. 1 is a perspective view of a lining pig according to a first embodiment; FIG. 2 is a cross-sectional view showing the operation of the lining pig according to the first embodiment; FIG. 3 is a view illustrating use of the lining pig according to the first embodiment; FIG. 4 is a perspective view of a lining pig according to a second embodiment. FIG. 5 is a cross-sectional view showing the operation of the lining pig according to the second embodiment. FIG. 7 is a perspective view of a lining pig according to a modified example. FIG. 7 is a cross-sectional view showing the operation of a lining pig according to a modified example of the second embodiment.
DESCRIPTION OF SYMBOLS 1 Large diameter pig 1a Large diameter pig through hole 2 Small diameter pig 2a Small diameter pig through hole 3 Through wire 4 Elastic body 5 Separation engagement means 6 Check valve 11 Separation engagement means 12 Connection means A Large diameter pipe B Small diameter pipe D lining agent

Claims (6)

大径管と小径管がほぼ同心状に接続されている配管の管内面にライニング剤を塗布するべく、前記大径管用の大径ピグと前記小径管用の小径ピグが分離可能な状態で連結され、前記小径ピグを前方に位置させてその小径ピグと前記大径ピグを牽引するための牽引用の通線が設けられている管内ライニング用ピグであって、
前記大径ピグと小径ピグが、前記通線挿通用の貫通孔を備え、前記通線が、両ピグの貫通孔を挿通して、設定値以上の引張り力により分離可能で、かつ、前記小径ピグに係合可能な分離係合手段を介して前記大径ピグに連結され、前記小径ピグ側からの加圧流体の通流を阻止する逆止弁が、前記大径ピグの貫通孔に設けられている管内ライニング用ピグ。
The large-diameter pipe and the small-diameter pig for the small-diameter pipe are connected in a separable state so as to apply a lining agent to the inner surface of the pipe in which the large-diameter pipe and the small-diameter pipe are connected substantially concentrically. A pipe lining pig in which the small-diameter pig is located in front and towing lines for pulling the small-diameter pig and the large-diameter pig are provided,
The large-diameter pig and the small-diameter pig are provided with through-holes for inserting the through-line, and the through-line is inserted through the through-holes of both pigs, and can be separated by a tensile force equal to or more than a set value, and A check valve, which is connected to the large-diameter pig via separation engagement means engageable with the pig and prevents flow of pressurized fluid from the small-diameter pig side, is provided in a through-hole of the large-diameter pig. Pigs for pipe linings.
前記分離係合手段が、前記通線の先端側に連結固定された弾性体を備え、前記大径ピグの貫通孔が、前記小径ピグの貫通孔よりも大径に形成されて、前記弾性体が、前記通線の設定値以上の引張り力による変形で前記大径ピグの貫通孔を通過して前記小径ピグの貫通孔に係合するように構成されている請求項1に記載の管内ライニング用ピグ。The separation engagement means includes an elastic body connected and fixed to a distal end side of the communication line, and a through-hole of the large-diameter pig is formed to have a larger diameter than a through-hole of the small-diameter pig. The pipe lining according to claim 1, wherein the pipe is configured to pass through the through-hole of the large-diameter pig and engage with the through-hole of the small-diameter pig by deformation due to a tensile force equal to or greater than a set value of the wire. For pig. 大径管と小径管がほぼ同心状に接続されている配管の管内面にライニング剤を塗布するべく、前記大径管用の大径ピグと前記小径管用の小径ピグが分離可能な状態で連結され、前記小径ピグを前方に位置させてその小径ピグと前記大径ピグを牽引するための牽引用の通線が設けられている管内ライニング用ピグであって、
前記大径ピグと小径ピグが、設定値以上の引張り力により分離可能に連結され、かつ、前記大径ピグが分離された状態で、前記小径ピグが前記通線により牽引可能に構成され、前記大径ピグが、前記小径ピグ側からの加圧流体の通流を阻止する構造体で構成されている管内ライニング用ピグ。
The large-diameter pipe and the small-diameter pig for the small-diameter pipe are connected in a separable state so as to apply a lining agent to the inner surface of the pipe in which the large-diameter pipe and the small-diameter pipe are connected substantially concentrically. A pipe lining pig in which the small-diameter pig is located in front and towing lines for pulling the small-diameter pig and the large-diameter pig are provided,
The large-diameter pig and the small-diameter pig are separably connected by a tensile force equal to or greater than a set value, and, in a state where the large-diameter pig is separated, the small-diameter pig is configured to be towable by the through line, An in-pipe lining pig in which a large-diameter pig is constituted by a structure for preventing flow of pressurized fluid from the small-diameter pig side.
前記小径ピグが、前記通線挿通用の貫通孔を備え、前記通線が、その小径ピグの貫通孔を挿通して、設定値以上の引張り力により分離可能で、かつ、前記小径ピグに係合可能な分離係合手段を介して前記大径ピグに連結されている請求項3に記載の管内ライニング用ピグ。The small diameter pig is provided with a through hole for inserting the through line, and the through line is inserted through the through hole of the small diameter pig, and can be separated by a tensile force equal to or greater than a set value, and is connected to the small diameter pig. 4. The pig for a pipe lining according to claim 3, wherein the pig is connected to the large-diameter pig through a separable engagement means. 前記大径ピグと小径ピグが、設定値以上の引張り力で分離可能な連結手段を介して互いに連結され、前記通線が、前記小径ピグに連結固定されている請求項3に記載の管内ライニング用ピグ。The pipe lining according to claim 3, wherein the large-diameter pig and the small-diameter pig are connected to each other via a connecting means that can be separated by a tensile force equal to or greater than a set value, and the through-wire is connected and fixed to the small-diameter pig. For pig. 前記大径ピグが、断面ほぼ円形の筒状または柱状に構成されている請求項1〜5のいずれか1項に記載の管内ライニング用ピグ。The pig for pipe lining according to any one of claims 1 to 5, wherein the large-diameter pig is formed in a cylindrical or columnar shape having a substantially circular cross section.
JP2003086173A 2003-03-26 2003-03-26 Pipe interior lining pig Pending JP2004290806A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101420008B1 (en) 2012-08-21 2014-07-17 주식회사 한국가스기술공사 A cleaning apparatus for pipe
WO2014109838A1 (en) * 2013-01-10 2014-07-17 Chevron U.S.A. Inc. Pig assembly and method for maintaining a functional line for conveying fluid
US9662690B2 (en) 2014-07-15 2017-05-30 Chevron U.S.A. Inc. Systems for maintaining a functional line for conveying fluid and pig assemblies for use therein

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101420008B1 (en) 2012-08-21 2014-07-17 주식회사 한국가스기술공사 A cleaning apparatus for pipe
WO2014109838A1 (en) * 2013-01-10 2014-07-17 Chevron U.S.A. Inc. Pig assembly and method for maintaining a functional line for conveying fluid
US8813770B2 (en) 2013-01-10 2014-08-26 Chevron U.S.A. Inc. Pig assembly and method for maintaining a functional line for conveying fluid
GB2524210A (en) * 2013-01-10 2015-09-16 Chevron Usa Inc Pig assembly and method for maintaining a functional line for conveying fluid
GB2543689A (en) * 2013-01-10 2017-04-26 Chevron Usa Inc Pig assembly and method for maintaining a functional line for conveying fluid
GB2524210B (en) * 2013-01-10 2017-05-03 Chevron Usa Inc Pig assembly and method for maintaining a functional line for conveying fluid
GB2543689B (en) * 2013-01-10 2017-07-12 Chevron Usa Inc Pig assembly and method for maintaining a functional line for conveying fluid
US9662690B2 (en) 2014-07-15 2017-05-30 Chevron U.S.A. Inc. Systems for maintaining a functional line for conveying fluid and pig assemblies for use therein

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