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JP3774484B2 - Coated corrugated tube and gas leak inspection method - Google Patents
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JP3774484B2 - Coated corrugated tube and gas leak inspection method - Google Patents

Coated corrugated tube and gas leak inspection method Download PDF

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Publication number
JP3774484B2
JP3774484B2 JP26807194A JP26807194A JP3774484B2 JP 3774484 B2 JP3774484 B2 JP 3774484B2 JP 26807194 A JP26807194 A JP 26807194A JP 26807194 A JP26807194 A JP 26807194A JP 3774484 B2 JP3774484 B2 JP 3774484B2
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JP
Japan
Prior art keywords
gas
pipe
tube
nail
coated
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.)
Expired - Lifetime
Application number
JP26807194A
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Japanese (ja)
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JPH08105589A (en
Inventor
信一 鹿又
孝 穴水
文隆 佐藤
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.)
Saibu Gas Co Ltd
Osaka Gas Co Ltd
Tokyo Gas Co Ltd
Toho Gas Co Ltd
Original Assignee
Saibu Gas Co Ltd
Osaka Gas Co Ltd
Tokyo Gas Co Ltd
Toho 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
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Application filed by Saibu Gas Co Ltd, Osaka Gas Co Ltd, Tokyo Gas Co Ltd, Toho Gas Co Ltd filed Critical Saibu Gas Co Ltd
Priority to JP26807194A priority Critical patent/JP3774484B2/en
Publication of JPH08105589A publication Critical patent/JPH08105589A/en
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Rigid Pipes And Flexible Pipes (AREA)

Description

【0001】
【産業上の利用分野】
本発明は、都市ガスの家内配管等に用いられる被覆コルゲート管に関する。とくには、被覆コルゲート管への釘打ちトラブルが起きた場合におけるガス洩れ検査時に、釘打ちトラブルを容易に発見することのできる被覆コルゲート管に関する。
また、そのような被覆コルゲート管のガス洩れ検査方法に関する。
【0002】
【従来の技術】
図3は、従来の被覆コルゲート管の管壁構造を示す断面図である。この被覆コルゲート管1´は、コルゲート管7とその外面の被覆3とからなる。コルゲート管7は、厚さ0.2 mm程度の薄肉ステンレス鋼管にコルゲート加工(円還状の凹凸加工)を施したものである。被覆3は、厚さ0.75mm程度の塩化ビニル等の樹脂被覆である。被覆の目的は、コルゲート管7の防触・キズ防止等である。コルゲート管7の内側の管内9には、圧力200mmH2 O程度の都市ガスが流れる。
【0003】
このような被覆コルゲート管は、可とう性に優れているので、ゴムホースや電線を引き回すような要領で、ガス管を屋内各所に引き回すことができる。そのため、従来のガス管(SGP)を用いた配管工事とは較べものにならないくらい施工性が良い。現状では、呼径8A〜32Aの被覆コルゲート管が市販されており、首都圏においては、戸建住宅の約7割、集合住宅の約5割のガス配管が被覆コルゲート管となっている。
【0004】
【発明が解決しようとする課題】
このように優れた被覆コルゲート管にも欠点がある。それは釘打に弱いことである。コルゲート管の肉厚が薄い(0.2 mm)ので、容易に釘が刺さってしまう。
【0005】
建築工程においては、建物の外側構造ができた後に、被覆コルゲート管を屋内の床下や壁裏に引き回す荒配管工事を行い、続いて床はり、壁はり工事を行い、その後に配管の端末を室内に引込んでガスバルブを付けて固定する(配管完成)。この床はり、壁はり工事の際に、すでに引き回された被覆コルゲート管に釘を打ってしまうことがあるのである。特に、壁立上り部のグリッパ(カーペット固定用)取付け時に、釘を被覆コルゲート管に打ち込みやすい。
【0006】
大工さんも、当然、被覆コルゲート管に釘を打たないように注意を払う。しかし、最近の高能率化された工事では、空気銃を用いて、多数の釘を短時間に打つので、金槌で釘を打つ場合と違って空気銃では釘を打つ時の感触がないため、被覆コルゲート管に釘を打っても、打ったことが分らない。また、被覆コルゲート管を保護する防護板(鉄製の厚さ1mm程度の板)も使われてはいるが、施工しにくいため、トラブルの防止は完全ではない。
【0007】
さらに具合の悪いことに、被覆コルゲート管に釘が打たれても、配管工事後のモレチェックの時などの際、すぐにはガス洩れにつながらず、建物が完成して、住人が入居後年月が経ってからガス洩れが起こることがある。というのは、樹脂被覆を釘が貫通した部分において、被覆が釘と密着してガス洩れをシールしてしまうからである。なお、コルゲート管と釘との間は、普通、そのようなシール特性が存在しないので、ガス洩れが起こる。
【0008】
このように入居後に初めてガス洩れが発見された場合は、その修復工事は極めて面倒である。家具を移動し、内装をはがし、家の各部をメチャクチャにしてしなうような事態となる。よって、釘打の有無を、配管工事後のモレチェックで検出できるようにせねばならない。
【0009】
本発明は、被覆コルゲート管への釘打トラブルが起きた場合に、ガス洩れ検査時にその検知の容易な被覆コルゲート管を提供することを目的とする。また、そのような被覆コルゲート管のガス洩れ検査方法を提供することを目的とする。
【0010】
上記課題を解決するため、本発明の被覆コルゲート管は、コルゲート加工された薄肉金属管の外周に樹脂被覆の施された、内部にガスの流れる被覆コルゲート管であって、上記被覆の内側に、管の長手方向に伸びる溝が設けられており、該被覆コルゲート管に釘打が生じた状態では、上記樹脂被覆を釘が貫通した部分においては被覆が釘と密着してガス洩れをシールし、上記金属管に釘が刺さっている部分からガスが該金属管の外側に洩れ、漏れたガスは、上記の溝を伝わって管の長手方向に流れ、管の端部から空気中に出てくることを特徴とする。
また、本発明の被覆コルゲート管のガス洩れ検査方法は、コルゲート加工された薄肉金属管の外周に樹脂被覆の施された、内部にガスの流れる被覆コルゲート管のガス洩れ検査方法であって、上記被覆の内側に、管の長手方向に伸びる溝を設けておき、該被覆コルゲート管に釘打が生じた状態でガスモレチェックを行った場合、上記樹脂被覆を釘が貫通した部分においては被覆が釘と密着してガス洩れをシールし、上記金属管に釘が刺さっている部分から、ガスが該金属管の外側に洩れ、漏れたガスは、上記の溝を伝わって管の長手方向に流れ、管の端部から空気中に出てくるため、配管内の圧力が徐々に下がることとなり、釘打ち込みの有無を知ることを特徴とする。
【0011】
【作用】
被覆コルゲート管に釘打が生じた状態でモレチェックを行った場合、コルゲート管(薄肉金属管)に釘が刺さっている部分から、ガスがコルゲート管(薄肉金属管)の外側に洩れる。漏れたガスは、上記の溝を伝わって管の長手方向に流れる。そして、管の端部(継手との接続部等)から空気中に出てくる。そのため、配管内の圧力が徐々に下がることとなり、釘打ち込みの有無を知ることができる。このモレチェックの段階で釘打ち込みを発見できれば、処置は比較的楽である。
【0012】
【実施例】
以下、本発明の実施例を説明する。
図1は、本発明の一実施例に係る被覆コルゲート管の断面構造を示す縦断面図である。従来同様に、コルゲート管(金属管)7の外側に被覆3が巻かれているが、この被覆3の内側には、管の長手方向に伸びる多数の溝5が入っている。
【0013】
図2は、図1の被覆コルゲート管に釘が打たれた状態における管壁構造を示す横断面図である。
管内9のガスは、釘がコルゲート管7を打ち抜いた穴13から、コルゲート管7の外側に洩れる。釘11と被覆3の間の穴15は、前述のとおり、被覆3が釘11の外周に密着してシールされている。そのため、穴15から外へはガスは漏れない。したがって、そのガスは、溝5を伝って、管の長手方向に進む。そして、管端から大気中に出る。
【0014】
このような構造となっているので、モレチェックの際に、ガス管内9に溜められたガスの圧力は、次第に低下してくる。そのため、ガス配管係統に異状があることが分かり、早めに処置することができる。
【0015】
【発明の効果】
以上の説明から明らかなように、本発明の被覆コルゲート管及びそのガス洩れ検査方法は、釘の打込みがあった場合、モレチェック時にその異状を捉えることができるので、住民の入居前に対処(修理)することが可能となる。そのため、安全面で改善されるとともに、対処のための手間も格段に少なくて済む。
【図面の簡単な説明】
【図1】本発明の一実施例にかかわる被覆コルゲート管の断面構造を示す縦断面図である。
【図2】図1の被覆コルゲート管に釘が打たれた状態における管壁構造を示す横断面図である。
【図3】従来の被覆コルゲート管の管壁構造を示す断面図である。
【符号の説明】
1 被覆コルゲート管 3 被覆
5 溝 7 コルゲート管
9 管内 11 釘
13 穴 15 穴
[0001]
[Industrial application fields]
The present invention relates to a coated corrugated pipe used for household piping of city gas. In particular, the present invention relates to a coated corrugated pipe that can easily find a nailing trouble at the time of gas leak inspection when a nailing trouble occurs in the coated corrugated pipe.
The present invention also relates to a gas leak inspection method for such a coated corrugated pipe.
[0002]
[Prior art]
FIG. 3 is a cross-sectional view showing a tube wall structure of a conventional coated corrugated tube. The coated corrugated tube 1 'is composed of a corrugated tube 7 and a coating 3 on the outer surface thereof. The corrugated tube 7 is a thin stainless steel tube having a thickness of about 0.2 mm, which is subjected to corrugating (returned uneven processing). The coating 3 is a resin coating such as vinyl chloride having a thickness of about 0.75 mm. The purpose of the coating is to prevent the corrugated pipe 7 from being touched or to be scratched. In the tube 9 inside the corrugated tube 7, city gas having a pressure of about 200 mmH 2 O flows.
[0003]
Since such a coated corrugated pipe is excellent in flexibility, the gas pipe can be routed to various places in the room in such a way as to route a rubber hose or an electric wire. Therefore, the workability is so good that it does not compare with the piping work using the conventional gas pipe (SGP). At present, coated corrugated pipes having a diameter of 8A to 32A are commercially available. In the Tokyo metropolitan area, about 70% of detached houses and about 50% of apartment houses are covered with corrugated pipes.
[0004]
[Problems to be solved by the invention]
Such an excellent coated corrugated tube also has drawbacks. It is vulnerable to nailing. Since the corrugated tube is thin (0.2 mm), the nail is easily pierced.
[0005]
In the building process, after the outside structure of the building is completed, rough piping work is performed to route the coated corrugated pipe under the floor or behind the wall, followed by floor beam and wall beam work, and then the piping terminal is installed indoors. Pull in and fix it with a gas valve (piping completed). When this floor beam or wall beam work is done, nails may be struck into the already covered corrugated pipe. In particular, it is easy to drive a nail into a coated corrugated pipe when attaching a gripper (for fixing a carpet) at a wall rising portion.
[0006]
Of course, the carpenter also pays attention not to nail the coated corrugated tube. However, in recent high-efficiency construction, using an air gun, a large number of nails are hit in a short time, so unlike the case of hitting a nail with a hammer, there is no feel when hitting a nail with an air gun, Even if a nail is struck in the coated corrugated tube, it is not known that the struck. Moreover, although a protective plate (iron plate with a thickness of about 1 mm) that protects the coated corrugated pipe is used, it is difficult to prevent trouble because it is difficult to construct.
[0007]
To make matters worse, even if a nail is struck on the coated corrugated pipe, it will not immediately lead to gas leaks, such as during a mole check after piping work. Gas leaks may occur after the moon passes. This is because at the portion where the nail penetrates the resin coating, the coating adheres to the nail and seals the gas leak. Note that normally there is no such sealing property between the corrugated tube and the nail, and therefore gas leakage occurs.
[0008]
Thus, when a gas leak is discovered for the first time after moving in, the repair work is extremely troublesome. Moving furniture, peeling off the interior, making every part of the house messed up. Therefore, it must be possible to detect the presence or absence of nailing by a mole check after piping work.
[0009]
It is an object of the present invention to provide a coated corrugated tube that can be easily detected during a gas leak inspection when a nailing trouble occurs in the coated corrugated tube. It is another object of the present invention to provide a gas leak inspection method for such a coated corrugated pipe.
[0010]
To solve the above problem, coating corrugated pipe of the present invention was subjected to resin coating on the outer periphery of the thin metal tube is corrugated, a coated corrugated tube of flow of gas into the inside of the coating, A groove extending in the longitudinal direction of the pipe is provided, and in a state where nailing has occurred in the coated corrugated pipe, in the portion where the nail penetrates the resin coating, the coating is in close contact with the nail to seal gas leakage, Gas leaks to the outside of the metal tube from the portion where the nail is inserted into the metal tube, and the leaked gas flows in the longitudinal direction of the tube through the groove and comes out into the air from the end of the tube. It is characterized by that.
A gas leak inspection method for a coated corrugated pipe according to the present invention is a gas leak inspection method for a coated corrugated pipe in which gas is flown inside, wherein the outer periphery of a corrugated thin metal pipe is coated with a resin. When a groove extending in the longitudinal direction of the pipe is provided on the inner side of the coating, and a gas mole check is performed with the coated corrugated pipe being nailed , the coating is not applied in the portion where the nail penetrates the resin coating Gas leakage leaks to the outside of the metal tube from the portion where the nail is stuck in the metal tube, and the leaked gas flows in the longitudinal direction of the tube through the groove. Since it comes out into the air from the end of the pipe, the pressure in the pipe gradually decreases, and it is characterized by knowing whether or not nails are driven.
[0011]
[Action]
If nailing the coating corrugated tube is subjected to leakage check in a state resulting from the portion that nail stuck in the corrugated tube (thin metal tube), leaking to the outside of the gas corrugated pipe (thin metal tube). The leaked gas flows in the longitudinal direction of the pipe along the groove. And it comes out in the air from the edge part (connection part etc. with a coupling) of a pipe. Therefore, the pressure in the pipe gradually decreases, and it is possible to know the presence or absence of nailing. If nailing is found at the stage of this mole check, the procedure is relatively easy.
[0012]
【Example】
Examples of the present invention will be described below.
FIG. 1 is a longitudinal sectional view showing a sectional structure of a coated corrugated pipe according to an embodiment of the present invention. As in the prior art, a coating 3 is wound on the outside of a corrugated tube (metal tube) 7, and a number of grooves 5 extending in the longitudinal direction of the tube are contained inside the coating 3.
[0013]
FIG. 2 is a cross-sectional view showing a tube wall structure in a state in which a nail is struck in the coated corrugated tube of FIG.
The gas in the tube 9 leaks to the outside of the corrugated tube 7 from the hole 13 in which the nail punches the corrugated tube 7. As described above, the hole 15 between the nail 11 and the cover 3 is sealed so that the cover 3 is in close contact with the outer periphery of the nail 11. Therefore, gas does not leak out from the hole 15. The gas therefore travels along the groove 5 in the longitudinal direction of the tube. And it goes out to the atmosphere from the pipe end.
[0014]
Since it has such a structure, the pressure of the gas accumulated in the gas pipe 9 gradually decreases during the mole check. Therefore, it can be seen that there is an abnormality in the gas piping staff, and treatment can be performed early.
[0015]
【The invention's effect】
As is clear from the above description, the coated corrugated pipe and the gas leak inspection method of the present invention can catch abnormalities at the time of mole check when a nail is driven. Repair). As a result, the safety is improved and the effort for dealing with the problem is significantly reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a sectional structure of a coated corrugated pipe according to an embodiment of the present invention.
2 is a cross-sectional view showing a tube wall structure in a state in which a nail is struck in the coated corrugated tube of FIG. 1. FIG.
FIG. 3 is a cross-sectional view showing a tube wall structure of a conventional coated corrugated tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coated corrugated pipe 3 Coated 5 Groove 7 Corrugated pipe 9 In the pipe 11 Nail 13 Hole 15 Hole

Claims (2)

コルゲート加工された薄肉金属管の外周に樹脂被覆の施された、内部にガスの流れる被覆コルゲート管であって、
上記被覆の内側に、管の長手方向に伸びる溝が設けられており、
該被覆コルゲート管に釘打が生じた状態では、上記樹脂被覆を釘が貫通した部分においては被覆が釘と密着してガス洩れをシールし、上記金属管に釘が刺さっている部分からガスが該金属管の外側に洩れ、漏れたガスは、上記の溝を伝わって管の長手方向に流れ、管の端部から空気中に出てくることを特徴とする被覆コルゲート管。
A corrugated pipe with a resin coating on the outer periphery of a corrugated thin-walled metal pipe, in which gas flows inside,
A groove extending in the longitudinal direction of the tube is provided inside the coating ,
In the state where the nail is generated in the coated corrugated pipe , the coating is in close contact with the nail at the portion where the nail penetrates the resin coating to seal the gas leak, and the gas is fed from the portion where the nail is stuck in the metal pipe. A coated corrugated pipe, wherein the leaked gas leaks to the outside of the metal pipe, flows in the longitudinal direction of the pipe through the groove, and comes out into the air from the end of the pipe.
コルゲート加工された薄肉金属管の外周に樹脂被覆の施された、内部にガスの流れる被覆コルゲート管のガス洩れ検査方法であって、
上記被覆の内側に、管の長手方向に伸びる溝を設けておき、
該被覆コルゲート管に釘打が生じた状態でガスモレチェックを行った場合、上記樹脂被覆を釘が貫通した部分においては被覆が釘と密着してガス洩れをシールし、上記金属管に釘が刺さっている部分から、ガスが該金属管の外側に洩れ、漏れたガスは、上記の溝を伝わって管の長手方向に流れ、管の端部から空気中に出てくるため、配管内の圧力が徐々に下がることとなり、釘打ち込みの有無を知ることを特徴とする被覆コルゲート管のガス洩れ検査方法。
A gas leak inspection method for a coated corrugated pipe in which a gas flows inside, wherein the outer periphery of a corrugated thin metal pipe is coated with a resin,
A groove extending in the longitudinal direction of the tube is provided inside the coating ,
When a gas mole check is performed in a state where nailing has occurred in the coated corrugated pipe , the coating is in close contact with the nail at the portion where the nail penetrates the resin coating, and the gas leakage is sealed. Gas leaks from the pierced portion to the outside of the metal tube, and the leaked gas flows in the longitudinal direction of the tube through the groove and exits into the air from the end of the tube. A method for inspecting a gas leak of a coated corrugated pipe, characterized in that the pressure gradually decreases and the presence or absence of nailing is known.
JP26807194A 1994-10-07 1994-10-07 Coated corrugated tube and gas leak inspection method Expired - Lifetime JP3774484B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26807194A JP3774484B2 (en) 1994-10-07 1994-10-07 Coated corrugated tube and gas leak inspection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26807194A JP3774484B2 (en) 1994-10-07 1994-10-07 Coated corrugated tube and gas leak inspection method

Publications (2)

Publication Number Publication Date
JPH08105589A JPH08105589A (en) 1996-04-23
JP3774484B2 true JP3774484B2 (en) 2006-05-17

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