JPH0771685A - Gas shutoff device for pipe unit - Google Patents

Gas shutoff device for pipe unit

Info

Publication number
JPH0771685A
JPH0771685A JP5220206A JP22020693A JPH0771685A JP H0771685 A JPH0771685 A JP H0771685A JP 5220206 A JP5220206 A JP 5220206A JP 22020693 A JP22020693 A JP 22020693A JP H0771685 A JPH0771685 A JP H0771685A
Authority
JP
Japan
Prior art keywords
pipe
gas
unit
seal
sealing means
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
Application number
JP5220206A
Other languages
Japanese (ja)
Inventor
Koichi Kondo
幸一 近藤
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.)
IHI Corp
Original Assignee
IHI Corp
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 IHI Corp filed Critical IHI Corp
Priority to JP5220206A priority Critical patent/JPH0771685A/en
Publication of JPH0771685A publication Critical patent/JPH0771685A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To improve reliability of pipe line shutoff by providing the first seal means removably mounted on a pipe unit internal wall and the second seal means formed of a seal bag unit provided in the front in a pipe unit from the first seal means and inflated by introducing gas to shut off inside the pipe unit. CONSTITUTION:In the case of mounting a shutoff device 18, first into a pipe unit 15 from its opening end, a total unit of the shutoff device 18 is inserted and fixed by tightening stopper bolts 23.... Next, a gas introducing pipe 26 is pressed in by a some degree to separate a closing plate 21 from a seal bag unit 27, and by feeding inflating gas from a base end side of the gas introducing pipe 26, the seal bag unit 27 is inflated to close the inside of the pipe unit 15. This shutoff device 18 has a closing member 19 inserted into the pipe unit 15 from its opening end and removably mounted, and this closing member is formed by providing a pipe seal unit 24 in a closing plate 21 provided in the point end part of a tube part 20 extended in the pipe unit 15, to constitute the first seal means B for performing a seal by hitting an internal peripheral surface of the pipe unit 15 to collapse a peripheral edge part of the pipe seal unit.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、管体のガス遮断装置に
係り、特に可燃性ガスが流れる管路系の改造工事等に際
して、一時的に可燃性ガスを遮断して溶接等の火気作業
を可能とした管体のガス遮断装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shut-off device for pipes, and in particular, when remodeling a pipeline system through which flammable gas flows, temporarily shut off the flammable gas to perform a fire work such as welding. The present invention relates to a gas shutoff device for a pipe body that enables the above.

【0002】[0002]

【従来の技術】近年、可燃性ガスが流れる管路系の老朽
化に伴って、その点検を兼ねた改修、改造工事が増加す
る傾向にある。この場合、設備を停止せず管路系に所定
圧の或いは減圧した可燃性ガスを流したまま老朽化の進
んだ部分のみ工事を行うことが望ましい。この工事の実
際は、老朽化の進んだ管体部分を切断し新規の管体を溶
接して付け換えるといったものであるが、この溶接作業
は火気作業であり、他方管体には可燃性ガスが送られて
くるので、遮断性の高い遮断弁等が設けられている場合
は別として、改造工事等に際しては溶接箇所の手前で確
実に且つ完全に可燃性ガスを遮断する装置が必要であ
る。
2. Description of the Related Art In recent years, there has been a tendency for repair and remodeling work, which also serves as inspection, to increase with the deterioration of a pipeline system through which combustible gas flows. In this case, it is desirable to carry out the work only on the aged part while the combustible gas of a predetermined pressure or a reduced pressure is allowed to flow through the pipeline without stopping the facility. The actual work of this work is to cut the aged pipe part and replace it by welding a new pipe, but this welding work is a fire work, and on the other hand flammable gas is in the pipe work. Since it is sent, apart from the case where a shut-off valve or the like having a high shut-off property is provided, a device for surely and completely shutting off the combustible gas is required before the welding site in the case of remodeling work.

【0003】この管体内の可燃性ガスを遮断する装置と
して、例えば図3及び図4に示すような装置を応用して
用いることが考えられる(実願平5-18321 号)。
As a device for shutting off the flammable gas in the pipe, it is possible to apply the device shown in FIGS. 3 and 4, for example (Japanese Patent Application No. 5-18321).

【0004】これら装置は、貯槽1の側ノズル2に設け
られて弁3が取付けられたフランジ部4の交換に伴い、
図の点線で示される新規溶接部5の耐圧・気密試験を行
う装置である。
These devices are accompanied by the replacement of the flange portion 4 provided on the side nozzle 2 of the storage tank 1 and having the valve 3 attached thereto.
This is an apparatus for performing a pressure resistance / airtightness test of a new welded portion 5 indicated by a dotted line in the figure.

【0005】先ず図3に示す装置は、弁3の開放端に取
付けられる閉止板6と、閉止板6を貫通して側ノズル2
内に挿入されたガス送入管7と、ガス送入管7の先端部
に設けられガスの送入により膨らんで側ノズル2内を閉
塞する袋体8と、袋体8と閉止板6との間にガスを封入
して新規溶接部5の耐圧・気密試験を行うために閉止板
6に設けられたガス封入ノズル9とから主に構成され
る。この構成により、新フランジ部4の溶接後ガス送入
管7を通じて窒素ガス等の膨脹用ガスを袋体8に送入す
ると、袋体8が膨らんで側ノズル2内は閉塞され、さら
にガス封入ノズル9から袋体8と閉止板6との間に窒素
ガス等の試験用ガスを所定圧力まで封入すれば、圧力計
13でその圧力を測定することにより新規溶接部5の耐
圧・気密試験を行うことができる。
First, in the apparatus shown in FIG. 3, a closing plate 6 attached to an open end of a valve 3 and a side nozzle 2 penetrating the closing plate 6 are provided.
A gas inlet pipe 7 inserted therein, a bag body 8 provided at the tip of the gas inlet pipe 7 and swelling by gas feed to close the inside of the side nozzle 2, a bag body 8 and a closing plate 6. It is mainly composed of a gas injection nozzle 9 provided in the closing plate 6 in order to perform a pressure resistance and airtightness test of the new welded part 5 by enclosing a gas between them. With this configuration, when the inflation gas such as nitrogen gas is fed into the bag body 8 through the gas feed pipe 7 after welding the new flange portion 4, the bag body 8 swells and the inside of the side nozzle 2 is closed, and further gas filling is performed. If a test gas such as nitrogen gas is sealed between the nozzle 9 and the bag body 8 and the closing plate 6 up to a predetermined pressure, the pressure gauge 13 measures the pressure to test the pressure resistance and airtightness of the new welded portion 5. It can be carried out.

【0006】次に図4に示す装置は、弁3の開放端に取
付けられる閉止板6と、閉止板6を貫通する貫通管10
を介して側ノズル2内に挿入された棒体11と、棒体1
1の先端部に設けられ、貫通管10との相対移動により
開閉されて側ノズル2内を閉塞する傘構造の閉塞体12
と、閉塞体12と閉止板6との間にガスを封入して新規
溶接部5の耐圧・気密試験を行うために閉止板6に設け
られたガス封入ノズル9とから主に構成される。この装
置は前述した装置の袋体8に代わって傘構造の閉塞体1
2により側ノズル2内を閉塞するもので、この装置を用
いても新規溶接部5の耐圧・気密試験を行うことができ
る。
Next, in the apparatus shown in FIG. 4, a closing plate 6 attached to the open end of the valve 3 and a through pipe 10 penetrating the closing plate 6 are provided.
And a rod body 1 inserted into the side nozzle 2 via
The closure body 12 is provided at the tip of the first nozzle 1 and has an umbrella structure that is opened and closed by relative movement with the through tube 10 to close the inside of the side nozzle 2.
And a gas sealing nozzle 9 provided in the closing plate 6 for sealing gas between the closing body 12 and the closing plate 6 to perform a pressure-proof / airtight test of the new welded portion 5. This device replaces the bag body 8 of the above-described device with an umbrella-shaped closure 1
Since the inside of the side nozzle 2 is closed by 2, the pressure resistance and airtightness test of the new welded portion 5 can be performed even by using this apparatus.

【0007】尚、図示例において弁3はバタフライ弁が
用いられているが、上記装置はいずれも弁3の種類に拘
らず弁体14を通過して側ノズル2内に挿入できるのが
特徴となっている。
In the illustrated example, a butterfly valve is used as the valve 3, but any of the above devices can be inserted into the side nozzle 2 through the valve body 14 regardless of the type of the valve 3. Has become.

【0008】[0008]

【発明が解決しようとする課題】ところで、上記装置は
あくまで溶接終了後の溶接部5における耐圧・気密試験
を行うためのものであり、袋体8或いは閉塞体12が多
少シール不十分であってもガス封入ノズル9より強制的
に試験用ガスを送り込むことにより、その新規溶接部5
を所定の試験圧力に保つことができる。逆に言えば、上
記装置はガスの遮断性能をそれほど期待できず、可燃性
ガス等が存在する管体内を閉塞して行う溶接等の火気作
業を考慮した場合、上記装置を用いることはできないと
いう問題がある。
By the way, the above-mentioned device is only for carrying out a pressure resistance / airtightness test on the welded portion 5 after the welding is completed, and the bag body 8 or the closure body 12 is somewhat insufficiently sealed. Also, by forcibly sending the test gas from the gas charging nozzle 9, the new welded portion 5
Can be maintained at a predetermined test pressure. Conversely, the above-mentioned device cannot be expected to have a high gas-blocking performance, and the above-mentioned device cannot be used in consideration of a burning work such as welding performed by closing the pipe body where flammable gas exists. There's a problem.

【0009】そこで、本発明の目的は、上記課題を解決
し、管体内の可燃性ガス等を確実に且つ完全に遮断し
て、溶接等の火気作業を安全に行ない得る管体のガス遮
断装置を提供することにある。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and to reliably and completely shut off flammable gas and the like in the pipe body, and to perform a fire work such as welding in a safe manner. To provide.

【0010】[0010]

【課題を解決するための手段】上記目的を達成するため
に本発明は、管体内にその開放端より挿入されて溶接等
が行なわれる管体の作業領域より挿入方向前方にて管体
内のガスを遮断する装置において、上記開放端より管体
内に挿入されて上記管体作業領域より前方に位置されて
管体内壁に着脱自在に取り付けられ、管体内を遮断する
第一のシール手段と、該第一のシール手段より管体内前
方に設けられ、ガスの導入により膨張して管体内を遮断
するシール袋体からなる第二のシール手段と、該第二の
シール手段にガスを導入すると共に第二のシール手段を
第一のシール手段より管体内前方に位置させて支持させ
るためのガス導入管と、上記第一のシール手段に設けら
れ、第二のシール手段と第一のシール手段との間にリー
クするガスを管体外に排気するリークガス排気管とを備
えたものである。
In order to achieve the above object, the present invention provides a gas inside the pipe body in the insertion direction in front of the working area of the pipe body where the pipe body is inserted from its open end and welded. A first sealing means that is inserted into the tubular body from the open end, is positioned in front of the tubular body working area, is detachably attached to the inner wall of the tubular body, and shuts off the tubular body. Second sealing means, which is provided in front of the first sealing means in the inside of the tubular body and is expanded by the introduction of gas to shut off the inside of the tubular body, and introduces gas into the second sealing means and A gas introducing pipe for supporting and supporting the second sealing means in front of the first sealing means in the tubular body; and a second sealing means and a first sealing means provided in the first sealing means. Gas leaks between the pipe It is obtained by a leak gas exhaust pipe for exhausting the.

【0011】[0011]

【作用】管体内に可燃性ガスが存在する場合、その可燃
性ガスは先ず膨張したシール袋体即ち第二のシール手段
により遮断される。また、もし仮に第一のシール手段よ
りリークガスが生じても、そのリークガスは今度は第一
のシール手段により遮断され、なおかつリークガス排気
管を通じて外部へ排気される。よって、上記装置にあっ
ては二重の遮断構造に排気構造を加えたものとなってお
り、これにより管体内の可燃性ガスを確実に且つ完全に
遮断することができる。
When the flammable gas is present in the pipe, the flammable gas is first blocked by the expanded seal bag body or the second sealing means. Further, even if a leak gas is generated from the first sealing means, the leak gas is blocked by the first sealing means this time and is exhausted to the outside through the leak gas exhaust pipe. Therefore, in the above-mentioned device, the exhaust structure is added to the double blocking structure, whereby the combustible gas in the pipe can be reliably and completely blocked.

【0012】[0012]

【実施例】以下本発明の一実施例を添付図面に基づいて
詳述する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

【0013】図1に示すように、この実施例において管
体15は、可燃性ガス17が貯蔵された槽体1の側ノズ
ル2(図2、図3参照)で、それは比較的大口径に形成
されたものである。この管体15にはフランジ16が作
業領域Aたる溶接部5で溶接されており、このフランジ
16の老朽化に伴う交換工事に際して、管体15内の可
燃性ガス17を管体15外に洩らさぬよう遮断する遮断
装置18が管体15に取り付けられる。
As shown in FIG. 1, in this embodiment, the tube body 15 is the side nozzle 2 (see FIGS. 2 and 3) of the tank body 1 in which the combustible gas 17 is stored, and it has a relatively large diameter. It was formed. A flange 16 is welded to the pipe body 15 at the welded portion 5 which is the work area A. During replacement work due to the deterioration of the flange 16, the flammable gas 17 inside the pipe body 15 leaks to the outside of the pipe body 15. A shutoff device 18 for shutting off is attached to the pipe body 15.

【0014】この遮断装置18は、管体15内にその開
放端即ちフランジ16の開放端より挿入され着脱自在に
取り付けられる閉止部材19を有している。閉止部材1
9は、管体15の開放端より管体15内にその軸心に沿
って延出される筒部20と、筒部20の先端部にフラン
ジ状に設けられ管体15の内径にほぼ等しい外径を有す
る閉止板21と、筒部20の略中間位置に半径方向外方
に突出して設けられた複数(3個以上)の係止部材22
と、係止部材22に螺合され管体15の内壁を押圧する
ことによって閉止部材19を固定させるストッパボルト
23とから主に構成される。
The shutoff device 18 has a closing member 19 which is inserted into the tubular body 15 from its open end, that is, the open end of the flange 16, and is detachably attached. Closing member 1
Reference numeral 9 denotes a tubular portion 20 extending from the open end of the tubular body 15 into the tubular body 15 along the axis thereof, and a flange portion provided at the tip of the tubular portion 20 and having an outer diameter substantially equal to the inner diameter of the tubular body 15. A closing plate 21 having a diameter, and a plurality of (three or more) locking members 22 provided at a substantially intermediate position of the tubular portion 20 so as to project radially outward.
And a stopper bolt 23 screwed to the locking member 22 to fix the closing member 19 by pressing the inner wall of the tubular body 15.

【0015】閉止部材19の閉止板21には、これと管
体15の内周面との隙間をシールするシール体24が設
けられる。このシール体24は、具体的には管体15の
内径よりやや大径に形成されたゴム等の板材で、その周
縁部が管体15の内周面に当って潰されることでシール
を行うものである。これら閉止部材19とシール体24
とによって第一のシール手段Bが構成され、この第一の
シール手段Bにより管体15内は遮断される。
The closing plate 21 of the closing member 19 is provided with a seal body 24 for sealing a gap between the closing plate 21 and the inner peripheral surface of the tube body 15. Specifically, the seal body 24 is a plate material such as rubber formed to have a diameter slightly larger than the inner diameter of the pipe body 15, and the peripheral portion of the seal body 24 abuts against the inner peripheral surface of the pipe body 15 to be crushed to perform sealing. It is a thing. These closing member 19 and sealing body 24
The first sealing means B is constituted by and the inside of the pipe body 15 is shut off by the first sealing means B.

【0016】閉止部材19の筒部20はその基端部が絞
られており、同時にその基端部にはガス導入管26の挿
通部25が形成される。この挿通部25の内周部にはシ
ール部材25aが設けられ、ガス導入管26が摺動自在
に且つ気密に挿通されるようになっている。ガス導入管
26の先端部は閉止板21よりさらに挿入方向前方に位
置され、その先端部には膨脹用ガスの導入により膨張し
て管体15内を閉塞する第二のシール手段Cたるシール
袋体27が設けられる。このシール袋体27は、具体的
にはゴム等の弾性体で形成された風船体であり、膨脹用
ガスが充填されないときには図の点線の如く萎んでい
る。また閉止部材19の筒部20には、シール袋体27
からリークガスRが発生した場合それを管体15外へ逃
がすためのリークガス排気管28が接続される。尚、図
示しないがリークガス排気管28の端部はある程度延出
されて外部に放置され、大気開放によりリークガスRを
逃がすようになっている。
The tubular portion 20 of the closing member 19 has a squeezed proximal end portion, and at the same time, an insertion portion 25 for a gas introduction pipe 26 is formed at the proximal end portion. A seal member 25a is provided on the inner peripheral portion of the insertion portion 25, and the gas introduction pipe 26 is slidably and airtightly inserted. The distal end of the gas introduction pipe 26 is located further forward than the closing plate 21 in the insertion direction, and the distal end of the gas introduction pipe 26 expands due to the introduction of the inflation gas to close the inside of the pipe body 15, which is a seal bag. A body 27 is provided. The seal bag body 27 is specifically a balloon body formed of an elastic body such as rubber, and is deflated as shown by the dotted line in the figure when not filled with inflation gas. Further, the sealing bag 27 is attached to the tubular portion 20 of the closing member 19.
A leak gas exhaust pipe 28 for connecting the leak gas R to the outside of the pipe 15 when the leak gas R is generated is connected. Although not shown, the end portion of the leak gas exhaust pipe 28 is extended to some extent and left outside so that the leak gas R is released by opening to the atmosphere.

【0017】このように構成された遮断装置18は、ス
トッパボルト23が溶接部5よりさらに前方の管体15
内壁に位置されて固定され、作業領域Aにおけるフラン
ジ16の切断及び再溶接作業に支障をきたさぬ配置がな
されている。また本実施例において筒部20は、閉止板
21及び係止部材22がそれぞれ両端に設けられる先端
側の第一筒部20aと、リークガス排気管28が接続さ
れる基端側の第二筒部20bとが一体的にフランジ接合
されて形成される。尚、これらをボルト止めしてフラン
ジ結合する構造とすれば、管体15の内径に応じて第一
筒部20aを交換することにより種々の管体15に対応
できる。
In the shut-off device 18 thus constructed, the stopper bolt 23 is located further forward of the welded portion 5 in the tubular body 15.
It is positioned and fixed to the inner wall, and is arranged so as not to interfere with the cutting and re-welding work of the flange 16 in the work area A. Further, in the present embodiment, the tubular portion 20 includes a first tubular portion 20a on the distal end side having a closing plate 21 and a locking member 22 provided at both ends, and a second tubular portion on the proximal end side to which the leak gas exhaust pipe 28 is connected. It is formed by integrally flange joining with 20b. In addition, if a structure is used in which these are bolted and flanged together, various pipe bodies 15 can be handled by exchanging the first cylindrical portion 20a according to the inner diameter of the pipe body 15.

【0018】次に実施例の作用を述べる。Next, the operation of the embodiment will be described.

【0019】遮断装置18の取付方法としては、先ず管
体15内にその開放端より遮断装置18全体を挿入し、
ストッパボルト23を全数均一に締め込んで閉止部材1
9を固定する。そしてガス導入管26をある程度押し込
んで閉止板21とシール袋体27とを離間させ、ガス導
入管26の基端側より膨脹用ガスを送入すれば、シール
袋体27が膨らんで管体15内は閉塞されることにな
る。
As a method of mounting the breaking device 18, first, the whole breaking device 18 is inserted into the tubular body 15 from its open end,
Closing member 1 by uniformly tightening all stopper bolts 23
Fix 9 Then, the gas introducing pipe 26 is pushed to some extent to separate the closing plate 21 from the seal bag body 27, and when inflation gas is fed from the base end side of the gas introducing pipe 26, the seal bag body 27 is inflated and the pipe body 15 The inside will be blocked.

【0020】これにより、管体15内の可燃性ガス17
は先ず膨らんだシール袋体27により遮断される。ま
た、もし仮に何かの原因でシール袋体27から僅かなリ
ークガスRが生じても、そのリークガスRは今度は第一
のシール手段Bにより洩れなく遮断され、なおかつリー
クガス排気管28を通じて外部へ逃がされる。
As a result, the combustible gas 17 in the pipe body 15 is
Is first blocked by the inflated seal bag 27. Further, even if a slight leak gas R is generated from the seal bag 27 for some reason, the leak gas R is blocked by the first seal means B without leakage and is released to the outside through the leak gas exhaust pipe 28. Be done.

【0021】特に、シール袋体27は管体15内壁の形
状に合わせて変形してそれを押圧し、それによって生じ
るフリクション抵抗によりガス導入管26を支持するこ
となく定位置に保持される。またこのフリクション抵抗
が可燃性ガス17の内圧に抗しきれずシール袋体27が
押しずらされても、ストッパボルト23で固定された閉
止板21にぶつかって規制されるので管体15外へ押出
されることはない。よって、シール袋体27を膨らまし
た後はガス導入管26を支持せずに作業を行うことがで
きる。
In particular, the seal bag 27 is deformed according to the shape of the inner wall of the tube 15 and presses it, and the friction resistance generated thereby holds the gas introduction tube 26 in place without supporting it. Further, even if the friction resistance cannot withstand the internal pressure of the flammable gas 17 and the seal bag 27 is pushed, it is restricted by hitting the closing plate 21 fixed by the stopper bolt 23, so that it is pushed out of the pipe body 15. There is no such thing. Therefore, after inflating the seal bag 27, the work can be performed without supporting the gas introduction pipe 26.

【0022】またリークガス排気管28により、シール
袋体27と閉止部材19との間の空間は外部と同じ大気
圧となることから、リークガスRが第一シール体24及
びシール部材25aを通過して外部へ洩れることはな
い。
Further, since the space between the seal bag 27 and the closing member 19 has the same atmospheric pressure as the outside due to the leak gas exhaust pipe 28, the leak gas R passes through the first seal member 24 and the seal member 25a. There is no leakage to the outside.

【0023】次に、変形実施例について述べる。Next, a modified embodiment will be described.

【0024】図2に示すように、この実施例においては
第一のシール手段Bたる閉止部材19の閉止板21を、
ガス導入管26が摺動自在且つ気密に貫通するようにな
っている。閉止板21の貫通孔21aにはOリングによ
るパッキン部材30が設けられる。また、リークガス排
気管28は外部に設置された排気手段31に接続され
る。この排気手段31は具体的にはブロワ32であり、
これによって筒部20内を僅かに吸引してリークガスR
を排気するようになっている。これにより、シール袋体
27から洩れてきたリークガスRは閉止板21手前で遮
断され、例え貫通孔21aを通過してきてもそれは排気
手段31に完全に吸引される。このように遮断装置18
を構成すれば、ガスの遮断性能をより一層向上させるこ
とができる。尚、逆にブロワ32で空気を送って筒部2
0内を僅かに加圧して、リークガスRを貫通孔21aか
ら洩れ難くしてもよい。
As shown in FIG. 2, in this embodiment, the closing plate 21 of the closing member 19 which is the first sealing means B is
The gas introduction pipe 26 is slidably and airtightly penetrates. A packing member 30 made of an O-ring is provided in the through hole 21 a of the closing plate 21. The leak gas exhaust pipe 28 is connected to an exhaust means 31 installed outside. This exhaust means 31 is specifically a blower 32,
As a result, the inside of the tubular portion 20 is slightly sucked and the leak gas R
Is designed to be exhausted. As a result, the leak gas R leaking from the seal bag 27 is blocked before the closing plate 21, and even if it passes through the through hole 21a, it is completely sucked by the exhaust means 31. Thus, the shutoff device 18
By configuring the above, the gas blocking performance can be further improved. On the contrary, the blower 32 sends air to the cylinder 2
The inside of 0 may be slightly pressurized so that the leak gas R does not easily leak from the through hole 21a.

【0025】以上述べたように、上記遮断装置18にあ
っては二重の遮断構造に排気構造を加えたものとなって
おり、これにより管体15内の可燃性ガス17を作業領
域Aへ漏洩させることなくその手前で確実に且つ完全に
遮断することができる。よって、作業領域Aにおける溶
接等の火気作業を安全に行なうことが可能となる。
As described above, the shut-off device 18 has a double shut-off structure and an exhaust structure, so that the combustible gas 17 in the pipe body 15 is transferred to the work area A. It is possible to surely and completely shut off before this without leaking. Therefore, it is possible to safely perform a fire work such as welding in the work area A.

【0026】尚、本実施例においては、ガス導入管26
を摺動自在としたがこれを完全に固定してしまってもよ
い。また、ガス導入管26に筒部20内を摺動するピス
トン(図示せず)を設けてもガスの遮断性能を向上する
ことができる。
In the present embodiment, the gas introduction pipe 26
Although it is slidable, it may be fixed completely. Further, even if the gas introducing pipe 26 is provided with a piston (not shown) that slides in the tubular portion 20, the gas blocking performance can be improved.

【0027】[0027]

【発明の効果】本発明は次の如き優れた効果を発揮す
る。
The present invention exhibits the following excellent effects.

【0028】(1)管体内の可燃性ガス等を作業領域の
手前で確実に且つ完全に遮断することができ、溶接等の
火気作業を安全に行なうことができる。
(1) Combustible gas and the like in the tube can be reliably and completely shut off before the work area, and the fire work such as welding can be performed safely.

【0029】(2)第一のシール手段と第二のシール手
段とによる二重の遮断構造に加え、リークガス排気管に
よる排気構造を有するので、ガスの遮断性能を一層向上
することができる。
(2) In addition to the double blocking structure by the first sealing means and the second sealing means, since it has the exhaust structure by the leak gas exhaust pipe, the gas blocking performance can be further improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に係るガス遮断装置の一実施例を示す側
断面図である。
FIG. 1 is a side sectional view showing an embodiment of a gas shutoff device according to the present invention.

【図2】変形実施例を示す側断面図である。FIG. 2 is a side sectional view showing a modified example.

【図3】従来例を示す側断面図である。FIG. 3 is a side sectional view showing a conventional example.

【図4】従来例を示す側断面図である。FIG. 4 is a side sectional view showing a conventional example.

【符号の説明】[Explanation of symbols]

15 管体 17 ガス 18 遮断装置 26 ガス導入管 27 シール袋体 28 リークガス排気管 A 作業領域 B 第一のシール手段 C 第二のシール手段 R リークガス 15 Pipe 17 Gas 18 Breaker 26 Gas Inlet 27 Seal Bag 28 Leak Gas Exhaust Pipe A Working Area B First Seal Means C Second Seal Means R Leak Gas

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 管体内にその開放端より挿入されて溶接
等が行なわれる管体の作業領域より挿入方向前方にて管
体内のガスを遮断する装置において、上記開放端より管
体内に挿入されて上記管体作業領域より前方に位置され
て管体内壁に着脱自在に取り付けられ、管体内を遮断す
る第一のシール手段と、該第一のシール手段より管体内
前方に設けられ、ガスの導入により膨張して管体内を遮
断するシール袋体からなる第二のシール手段と、該第二
のシール手段にガスを導入すると共に第二のシール手段
を第一のシール手段より管体内前方に位置させて支持さ
せるためのガス導入管と、上記第一のシール手段に設け
られ、第二のシール手段と第一のシール手段との間にリ
ークするガスを管体外に排気するリークガス排気管とを
備えたことを特徴とする管体のガス遮断装置。
1. A device for shutting off gas in the pipe body in the insertion direction forward of the working area of the pipe body where the pipe body is inserted from its open end to perform welding or the like, and is inserted into the pipe body from the open end. And a first sealing means that is located in front of the tubular body working area and is detachably attached to the inner wall of the tubular body and that shuts off the inside of the tubular body; A second sealing means, which is a sealing bag body that expands by the introduction and shuts off the inside of the tube, and a gas is introduced into the second sealing means, and the second sealing means is located forward of the first sealing means in the tube. A gas introduction pipe for positioning and supporting, and a leak gas exhaust pipe provided in the first sealing means for exhausting a gas leaking between the second sealing means and the first sealing means to the outside of the tubular body. Is equipped with A gas shutoff device for the pipe.
JP5220206A 1993-09-03 1993-09-03 Gas shutoff device for pipe unit Pending JPH0771685A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5220206A JPH0771685A (en) 1993-09-03 1993-09-03 Gas shutoff device for pipe unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5220206A JPH0771685A (en) 1993-09-03 1993-09-03 Gas shutoff device for pipe unit

Publications (1)

Publication Number Publication Date
JPH0771685A true JPH0771685A (en) 1995-03-17

Family

ID=16747554

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5220206A Pending JPH0771685A (en) 1993-09-03 1993-09-03 Gas shutoff device for pipe unit

Country Status (1)

Country Link
JP (1) JPH0771685A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007162785A (en) * 2005-12-12 2007-06-28 Tokyo Electric Power Co Inc:The Piping closing device, piping closing facility, and piping closing method
JP2012219918A (en) * 2011-04-08 2012-11-12 Nippon Steel Pipeline Co Ltd Device for replacing gas in gas pipe
JP2016117078A (en) * 2014-12-19 2016-06-30 三菱重工業株式会社 Laser cutting method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007162785A (en) * 2005-12-12 2007-06-28 Tokyo Electric Power Co Inc:The Piping closing device, piping closing facility, and piping closing method
JP2012219918A (en) * 2011-04-08 2012-11-12 Nippon Steel Pipeline Co Ltd Device for replacing gas in gas pipe
JP2016117078A (en) * 2014-12-19 2016-06-30 三菱重工業株式会社 Laser cutting method

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