【０００１】
【発明の属する技術分野】
本発明は、拡径変形自在な閉塞部材を縮径状態で管内に挿抜自在に設け、前記閉塞部材を管内で拡径変形させて、管内を閉塞可能に設けてある管内閉塞具に関する。
【０００２】
【従来の技術】
上記管内閉塞具では、従来、ガスバッグなどの縮径状態の閉塞部材を管内面に対して摺接させながら移動させて、管内の所望の閉塞位置に挿入したり、閉塞位置から管外に抜き出したりしている（ 例えば、特許文献１参照） 。
【０００３】
【特許文献１】
特開２００２−１６８３９１号公報
【０００４】
【発明が解決しようとする課題】
このため、縮径状態の閉塞部材を、例えばエルボなどの継手を接続してある管内で、その継手を通過して移動させて、管内の所望の閉塞位置に挿入したり、その閉塞位置から継手を通過して管外に抜き出すような場合に、継手の接続部に形成されている段部に閉塞部材が引っ掛かって、円滑に挿抜しにくい欠点がある。本発明は上記実情に鑑みてなされたものであって、管内で拡径変形させた閉塞部材のシール機能を損なうことなく、縮径状態の閉塞部材が管内の段部などを通過する際に、閉塞部材が引っ掛かりにくい管内閉塞具を提供することを目的とする。
【０００５】
【課題を解決するための手段】
請求項１記載の発明の特徴構成は、拡径変形自在な閉塞部材を縮径状態で管内に挿抜自在に設け、前記閉塞部材を管内で拡径変形させて、管内を閉塞可能に設けてある管内閉塞具であって、前記閉塞部材の外側を管内挿入方向の前後に亘って湾曲状態で跨ぐ滑りガイド部材を、管径方向内方側に向けて弾性変形自在に設けると共に、その滑りガイド部材の複数本を前記閉塞部材の周方向に互いに間隔を隔てて配置した状態で、それらの両端部を前記閉塞部材の管内挿入方向の前後位置に支持する一対の支持部を設け、前記閉塞部材を拡径させた状態で、前記滑りガイド部材を挟む管内面と前記閉塞部材との間の隙間をシールするシール機構を設けてある点にある。
【０００６】
〔作用及び効果〕
閉塞部材の外側を管内挿入方向の前後に亘って湾曲状態で跨ぐ滑りガイド部材の複数本を、閉塞部材の周方向に互いに間隔を隔てて配置して、それらの両端部を一対の支持部で閉塞部材の管内挿入方向の前後位置に支持してあるので、滑りガイド部材を管内面に対して摺接させながら移動させて、縮径状態の閉塞部材を、管径方向の中心部近くに保持した状態で、管内の所望の閉塞位置に挿入したり、閉塞位置から管外に抜き出したりすることができる。
また、各滑りガイド部材を管径方向内方側に向けて弾性変形自在に設けてあるので、エルボなどの継手を接続してあって管内面に段部が形成されているような管内で、縮径状態の閉塞部材がその段部を通過するように挿抜する場合でも、各滑りガイド部材が管内面との接触状態に応じて管径方向に弾性変形して、閉塞部材を、管径方向の中心部近くに保持した状態で、段部を円滑に通過させることができる。
その上、閉塞部材を拡径させた状態で、滑りガイド部材を挟む管内面と閉塞部材との間の隙間をシールするシール機構を設けてあるので、閉塞部材を管内で拡径させても、滑りガイド部材を挟む管内面と閉塞部材との間の隙間を通して管内流体が移動するおそれも少ない。
従って、管内で拡径変形させた閉塞部材のシール機能を損なうことなく、縮径状態の閉塞部材が管内の段部などを通過する際に、閉塞部材が引っ掛かりにくい。
【０００７】
請求項２記載の発明の特徴構成は、前記滑りガイド部材を板バネ材で構成してある点にある。
【０００８】
〔作用及び効果〕
滑りガイド部材を板バネ材で構成してあるので、滑りガイド部材を管径方向内方側に向けて弾性変形自在に設けるにあたって、滑りガイド部材を管径方向外方側に向けて弾性付勢する弾性体を別途設けるような必要がなく、構造の簡素化を図ることができる。
【０００９】
請求項３記載の発明の特徴構成は、前記一対の支持部どうしを、前記滑りガイド部材の管径方向内方側に向けての弾性変形に伴って、管内挿入方向に沿って互いに離間する方向に相対移動自在に設けてある点にある。
【００１０】
〔作用及び効果〕
一対の支持部どうしを、滑りガイド部材の管径方向内方側に向けての弾性変形に伴って、管内挿入方向に沿って互いに離間する方向に相対移動自在に設けてあるので、管内径が小さい箇所では、一対の支持部どうしが互いに離間しながら、滑りガイド部材が管径方向内方側に向けて弾性変形し、管内径が大きい箇所では、一対の支持部どうしが互いに近接しながら、滑りガイド部材が管径方向外方側に向けて復帰変形し、縮径状態の閉塞部材が管内面に形成された段部を通過するように挿抜する場合に、各滑りガイド部材が管内径の変化に応じて管径方向に容易に弾性変形して、段部を円滑に通過させることができる。
【００１１】
【発明の実施の形態】
以下に本発明の実施の形態を図面に基づいて説明する。
図１は、拡径変形自在な閉塞部材１を縮径状態で管内に挿抜自在に設け、管内に挿入した閉塞部材１を管内で拡径変形させることにより、閉塞部材１の管周方向に沿う外周面２を略全周に亘って管内面３側に弾性的に密着させて、その管内を閉塞可能に設けてある管内閉塞具の一例としての流体遮断用バッグＡを示す。
【００１２】
前記流体遮断用バッグＡは、例えば都市ガス配管などの流体供給管（以下ガス管を例に説明する）の途中部分を或る長さ範囲に亘って補修したり、取り替えるなどの補修工事をする場合に、図５に示すように、その工事区間の両端箇所近くのガス管Ｂに、穿孔、遮断、仮連絡をノーブローで行うための穿孔装置Ｃを取付けて、その穿孔装置Ｃに設けた斜管Ｃ１とガス管Ｂに穿設した貫通孔Ｂ１とを通して、斜め方向からガス管Ｂ内に挿入してガスを気密遮断するために用いられるものである。
【００１３】
つまり、バッグ本体（ 閉塞部材の一例） １に流体給排用の可撓性を備えた硬質短管４を接続して流体遮断用バッグＡを構成し、ガス管Ｂ内に挿入したバッグ本体１を短管４に接続した可撓性を備えた硬質管５で押し込んで、閉塞予定箇所において、硬質管５と短管４とを通して内部に供給した加圧空気などで拡径変形させることにより、図３，図４に示すように、バッグ本体１の管周方向に沿う外周面２を略全周に亘ってガス管Ｂの管内面３側に弾性的に密着させて、その管内を気密に閉塞遮断できるように構成してある。
【００１４】
前記バッグ本体１は、図２に示すように、天然ゴムなどの柔軟な材料で形成してある円筒状の筒体６の外周面に、全周に亘ってゴム体（ クロロプレンゴム等） や独立発泡弾性樹脂などで形成した弾性樹脂層７を接着し、筒体６の両端部に弾性樹脂層７と共に先端保形部８と基端保形部９を固定して構成してある。
【００１５】
そして、先端保形部８と基端保形部９とにガイド球体１０，１１を設けて、基端ガイド球体１１に形成した貫通孔１２に短管４を挿通し、複数本（ 本実施形態では４本） の滑りガイド部材１３を、バッグ本体１の外側を管内挿入方向の前後に亘って湾曲状態で跨ぐ姿勢で設けてある。
【００１６】
前記滑りガイド部材１３の各々は、金属や樹脂製の板バネ材で側面視でくの字形の帯状に形成して、管径方向内方側に向けて弾性変形自在に設けてあり、それらの滑りガイド部材１３をバッグ本体１の周方向に互いに等間隔を隔てて配置した状態で、それらの両端部をバッグ本体１の管内挿入方向の前後位置に支持する一対の支持部１４を設けて、バッグ本体１を管内で移動させるときに、図１中に仮想線で示すように、各滑りガイド部材１３を管内面３との接触で管径方向内方側に向けて強制的に弾性変形させて、管内面３に対して摺接移動させるようにしてある。
【００１７】
前記先端保形部８は、筒体６の内側に硬質の筒状スペーサ１５を内嵌するとともに、その筒状スペーサ１５の内側に栓部材１６を嵌め込んで、筒体６の外周側に金属筒部材１７を被せて弾性樹脂層７ごとかしめることにより、栓部材１６と金属筒部材１７との間に筒体６の端部を弾性樹脂層７および筒状スペーサ１５とともに気密に挟み込んで固定し、金属筒部材１７の抜け止め用キャップ１８に先端ガイド球体１０を一体に設けてある。
【００１８】
前記基端保形部９は、筒体６の内側に硬質の筒状スペーサ１５を内嵌するとともに、短管４をバッグ本体１に接続する金属製の内筒部材１９をその筒状スペーサ１５の内側に嵌合し、筒体６の外周側に金属筒部材１７を被せて弾性樹脂層７ごとかしめることにより、内筒部材１９と金属筒部材１７との間に筒体６の端部を弾性樹脂層７および筒状スペーサ１５とともに気密に挟み込んで、短管４を内筒部材１９に接続し、金属筒部材１７の抜け止め用鍔部材２０に基端ガイド球体１１を一体に設けてある。
【００１９】
そして、硬質管５と短管４とに亘って挿通したチューブ２１を、栓部材１６に形成した貫通孔２２に連通接続するとともに、その貫通孔２２に連通する連通孔２３を先端ガイド球体１０に形成して、流体遮断用バッグＡで閉塞した管内のバッグ本体１よりも奥側の管内圧力を、チューブ２１を通して、管外から測定できるようにしてある。
【００２０】
前記一対の支持部１４は、先端保形部８の金属筒部材１７と基端保形部９の金属筒部材１７との外周面に、リング部材２４を抜け止め状態で筒軸方向に移動自在に外嵌するとともに、これらのリング部材２４に各滑りガイド部材１３の両端部を管内挿入方向に沿って斜めに固定して、滑りガイド部材１３の管径方向内方側に向けての弾性変形に伴って、管内挿入方向に沿って互いに離間する方向に相対移動自在に設けてある。
【００２１】
また、各滑りガイド部材１３の基部側に、その基部側を包むように、ゴム体（ クロロプレンゴム等） や独立発泡弾性樹脂で形成した弾性樹脂層２５を接着して、図３，図４に示すように、バッグ本体１を拡径させた状態で、バッグ本体１に設けた弾性樹脂層７との共同で、滑りガイド部材１３を挟む管内面３とバッグ本体１との間の隙間をシールするシール機構２６を設けてある。
【００２２】
図５は、上記流体遮断用バッグＡのバッグ本体１を、既述のように、縮径状態でガス管Ｂ内に挿入して、滑りガイド部材１３を管内面３に対して摺接させながら、短管４と硬質管５とで押し込んで、所定の閉塞予定箇所に移動させる状態を示している。
【００２３】
前記ガス管Ｂには、エルボＢ２の接続箇所に段部Ｄが形成されており、直管部を移動するときのバッグ本体１（ 図中、１ａで示す） は、各滑りガイド部材１３の弾性力で管径方向の中心部近くに保持された状態で移動し、エルボＢ２を移動するときのバッグ本体１（ 図中、１ｂで示す） は、各滑りガイド部材１３が管内面３との接触状態に応じて管径方向に弾性変形して、バッグ本体１が管径方向の中心部近くに保持された状態で段部Ｄを円滑に通過する。
【００２４】
そして、閉塞予定箇所に移動したバッグ本体１（ 図中、１ｃで示す） は、硬質管５及び短管４を通じて供給した加圧空気で膨張させて拡径変形し、バッグ本体１の外周面２を管内面３側に弾性的に密着させる。
【００２５】
このとき、図３，図４に示したように、各滑りガイド部材１３と管内面３との隙間は、滑りガイド部材１３に接着してある弾性樹脂層２５でシールされ、各滑りガイド部材１３とバッグ本体１との隙間は、滑りガイド部材１３に接着してある弾性樹脂層２５とバッグ本体１に設けてある弾性樹脂層７とでシールされるので、管内を確実に閉塞することができる。
【００２６】
〔その他の実施形態〕
１．本発明による管内閉塞具は、滑りガイド部材を管径方向外方側に向けて弾性付勢する弾性体を別途設けて、滑りガイド部材を管径方向内方側に向けて弾性変形自在に設けてあっても良い。
２．本発明による管内閉塞具は、滑りガイド部材の両端部を閉塞部材の管内挿入方向の前後位置に支持する一対の支持部の双方、又は、一方を、閉塞部材側に移動不能に設けてあっても良い。
３．本発明による管内閉塞具は、滑りガイド部材やバッグ本体の外周面に設けた独立気泡の発泡弾性樹脂層に液状シール材を塗布したり、滑りガイド部材やバッグ本体の外周面に設けた連続気泡の発泡弾性樹脂層に液状シール材を含浸させて、閉塞部材を拡径させた状態で、滑りガイド部材を挟む管内面と閉塞部材との隙間を効果的にシールできるように構成してあっても良い。
４．本発明による管内閉塞具は、上水道管や下水道管などの各種流体管の管内を閉塞するために使用しても良い。
【図面の簡単な説明】
【図１】管内閉塞具の側面図
【図２】管内閉塞具の縦断面図
【図３】閉塞部材を管内で拡径変形させた管内閉塞具の側面図
【図４】図３のＩＶ−ＩＶ 線矢視断面図
【図５】閉塞部材の管内移動の説明図
【符号の説明】
１ 閉塞部材
３ 管内面
１３ 滑りガイド部材
１４ 支持部
２６ シール機構[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an in-tube obturator in which a closing member capable of expanding and deforming is provided in a reduced diameter state so as to be freely inserted into and removed from a tube, and the closing member is expanded and deformed in the tube so that the inside of the tube can be closed.
[0002]
[Prior art]
Conventionally, in the above-mentioned in-pipe closing device, a closing member in a reduced diameter state such as a gas bag is moved while sliding against the inner surface of the pipe to be inserted into a desired closed position in the pipe or pulled out from the closed position to the outside of the pipe. (For example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-168391
[Problems to be solved by the invention]
For this reason, the closing member in the reduced diameter state is moved through the joint, for example, in a pipe to which a joint such as an elbow is connected, and inserted into a desired closed position in the pipe, or the joint is connected from the closed position. In the case where the joint member is pulled out of the pipe through the pipe, there is a drawback that the closing member is caught by the step formed in the joint portion of the joint, so that it is difficult to smoothly insert and remove the joint. The present invention has been made in view of the above circumstances, without impairing the sealing function of the closing member that has been expanded and deformed in the pipe, when the closing member in the reduced diameter state passes through a step portion or the like in the pipe, It is an object of the present invention to provide an in-pipe obturator in which an obstructing member is hardly caught.
[0005]
[Means for Solving the Problems]
In the characteristic configuration of the invention according to the first aspect, a closing member capable of expanding and deforming is provided so as to be freely inserted into and removed from the pipe in a reduced diameter state, and the closing member is provided so as to be capable of expanding and deforming in the pipe so that the inside of the pipe can be closed. An in-pipe obturator, wherein a sliding guide member that straddles the outside of the obstructing member in a curved state across the front and rear in the in-tube insertion direction is provided so as to be elastically deformable inward in the pipe radial direction, and the sliding guide member is provided. In a state in which a plurality of the closing members are arranged at intervals in the circumferential direction of the closing member, a pair of support portions for supporting both ends thereof at front and rear positions in the pipe insertion direction of the closing member are provided, and the closing member is provided. The present invention is characterized in that a seal mechanism for sealing a gap between the inner surface of the pipe sandwiching the slide guide member and the closing member in a state where the diameter is enlarged is provided.
[0006]
[Action and effect]
A plurality of sliding guide members that straddle the outside of the closing member in a curved state across the front and back in the insertion direction in the tube are arranged at intervals in the circumferential direction of the closing member, and both ends thereof are supported by a pair of support portions. Since the closing member is supported at the front and rear positions in the inserting direction of the pipe, the sliding guide member is moved while sliding against the inner surface of the pipe to hold the closing member in the reduced diameter state near the center in the pipe diameter direction. In this state, it can be inserted into a desired closed position in the tube, or can be extracted out of the tube from the closed position.
Also, since each slide guide member is provided so as to be elastically deformable toward the pipe radially inward side, in a pipe where a joint such as an elbow is connected and a step is formed on the pipe inner surface, Even when the closing member in the reduced diameter state is inserted and removed so as to pass through the step portion, each sliding guide member is elastically deformed in the pipe diameter direction according to the contact state with the inner surface of the pipe, and the closing member is moved in the pipe diameter direction. Can be smoothly passed through the stepped portion while being held near the center of the.
In addition, since the sealing member is provided with a sealing mechanism for sealing a gap between the inner surface of the tube sandwiching the slide guide member and the closing member in a state where the closing member is expanded, even if the closing member is expanded in the tube, The fluid in the pipe is less likely to move through the gap between the inner surface of the pipe sandwiching the sliding guide member and the closing member.
Therefore, the closing member is less likely to be caught when the closing member in the reduced diameter state passes through a step or the like in the tube without impairing the sealing function of the closing member that has been expanded and deformed in the pipe.
[0007]
A feature of the invention according to claim 2 is that the slide guide member is formed of a leaf spring material.
[0008]
[Action and effect]
Since the slide guide member is made of a leaf spring material, when the slide guide member is elastically deformed inward in the pipe radial direction, the slide guide member is elastically biased outward in the pipe radial direction. There is no need to separately provide an elastic body to be used, and the structure can be simplified.
[0009]
The feature configuration of the invention according to claim 3 is a direction in which the pair of support portions are separated from each other along the tube insertion direction with elastic deformation of the slide guide member toward the inside in the tube radial direction. Is provided so as to be relatively movable.
[0010]
[Action and effect]
Since the pair of support portions are provided so as to be relatively movable in a direction away from each other along the insertion direction in the tube with the elastic deformation of the slide guide member toward the inner side in the tube diameter direction, the inner diameter of the tube is reduced. At a small portion, the pair of support portions are separated from each other, the sliding guide member is elastically deformed inward in the pipe radial direction, and at a portion with a large pipe inner diameter, the pair of support portions are close to each other, When the sliding guide member is deformed to return toward the outer side in the radial direction of the pipe, and when the closing member in the reduced diameter state is inserted and removed so as to pass through the step formed on the inner surface of the pipe, each sliding guide member has an inner diameter of the pipe. It can be easily elastically deformed in the pipe diameter direction according to the change, and can smoothly pass through the step.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a state in which a closing member 1 capable of expanding and deforming is provided in a reduced-diameter state so that it can be inserted into and removed from a pipe, and the closing member 1 inserted in the pipe is expanded and deformed in the pipe, so that the closing member 1 extends along the circumferential direction of the pipe. A fluid blocking bag A is shown as an example of a pipe closing device in which an outer peripheral surface 2 is elastically brought into close contact with the pipe inner surface 3 over substantially the entire circumference and is provided so as to close the pipe.
[0012]
For the fluid blocking bag A, for example, repair work such as repairing or replacing an intermediate portion of a fluid supply pipe such as a city gas pipe (hereinafter described as an example of a gas pipe) over a certain length range. In this case, as shown in FIG. 5, a drilling device C for performing drilling, blocking, and temporary communication with no blow is attached to a gas pipe B near both ends of the construction section, and a slope provided on the drilling device C is provided. The gas is inserted obliquely into the gas pipe B through the pipe C1 and the through hole B1 formed in the gas pipe B, and is used to hermetically shut off gas.
[0013]
That is, the bag body 1 (an example of the closing member) 1 is connected to the flexible hard short pipe 4 for supplying and discharging the fluid to form the fluid blocking bag A, and the bag body 1 inserted into the gas pipe B Is pressed by a flexible hard tube 5 connected to the short tube 4, and is expanded and deformed by pressurized air supplied to the inside through the hard tube 5 and the short tube 4 at a portion to be closed, As shown in FIGS. 3 and 4, the outer peripheral surface 2 of the bag body 1 along the circumferential direction of the bag is elastically adhered to the inner surface 3 of the gas pipe B over substantially the entire circumference, so that the inside of the pipe is airtight. It is configured so that blockage can be blocked.
[0014]
As shown in FIG. 2, the bag body 1 has a rubber body (chloroprene rubber or the like) or an independent body on the outer peripheral surface of a cylindrical body 6 formed of a flexible material such as natural rubber. An elastic resin layer 7 formed of a foamed elastic resin or the like is adhered, and a distal end shape retaining portion 8 and a base end shape retaining portion 9 are fixed to both ends of the cylindrical body 6 together with the elastic resin layer 7.
[0015]
Then, guide spheres 10 and 11 are provided on the distal end shape retaining portion 8 and the proximal end shape retaining portion 9, and the short pipe 4 is inserted into the through hole 12 formed in the proximal end guide spherical portion 11, and a plurality of short tubes 4 (in this embodiment) In this case, four sliding guide members 13 are provided so as to straddle the outside of the bag body 1 in a curved state across the front and rear in the tube insertion direction.
[0016]
Each of the sliding guide members 13 is formed in a U-shaped band shape in a side view from a leaf spring material made of metal or resin, and is provided so as to be elastically deformable inward in the pipe radial direction. In a state where the sliding guide members 13 are arranged at equal intervals in the circumferential direction of the bag body 1, a pair of support portions 14 for supporting both ends thereof at front and rear positions in the tube insertion direction of the bag body 1 are provided, When the bag body 1 is moved in the pipe, each slide guide member 13 is forcibly elastically deformed inward in the pipe radial direction by contact with the pipe inner surface 3 as shown by a virtual line in FIG. Thus, it is slidably moved with respect to the pipe inner surface 3.
[0017]
The tip shape retaining portion 8 has a hard cylindrical spacer 15 fitted inside the cylindrical body 6 and a plug member 16 fitted inside the cylindrical spacer 15, so that the outer peripheral side of the cylindrical body 6 By covering the tubular member 17 and crimping the elastic resin layer 7 together, the end of the tubular body 6 is hermetically sandwiched and fixed between the plug member 16 and the metallic tubular member 17 together with the elastic resin layer 7 and the tubular spacer 15. The tip guide sphere 10 is provided integrally with the cap 18 for retaining the metal cylinder member 17.
[0018]
The base-end retaining portion 9 has a hard cylindrical spacer 15 inside the cylindrical body 6 and a metal inner cylindrical member 19 for connecting the short pipe 4 to the bag body 1. Of the cylindrical body 6 between the inner cylindrical member 19 and the metal cylindrical member 17 by fitting the metal cylindrical member 17 on the outer peripheral side of the cylindrical body 6 and crimping the elastic resin layer 7 together. With the elastic resin layer 7 and the tubular spacer 15 in an airtight manner, the short pipe 4 is connected to the inner tubular member 19, and the base guide sphere 11 is integrally provided on the retaining flange member 20 of the metal tubular member 17. is there.
[0019]
The tube 21 inserted between the hard tube 5 and the short tube 4 is connected to a through hole 22 formed in the plug member 16, and a communication hole 23 communicating with the through hole 22 is connected to the tip guide sphere 10. The pressure inside the tube closed by the fluid blocking bag A and located on the back side of the bag body 1 can be measured from outside the tube through the tube 21.
[0020]
The pair of support portions 14 are movable on the outer peripheral surfaces of the metal cylindrical member 17 of the distal end shape retaining portion 8 and the metal cylindrical member 17 of the proximal end shape retaining portion 9 in the cylinder axial direction while retaining the ring member 24. And both ends of each slide guide member 13 are obliquely fixed to these ring members 24 along the direction of insertion into the tube, and the slide guide member 13 is elastically deformed inward in the radial direction of the tube. Accordingly, they are provided so as to be relatively movable in a direction away from each other along the tube insertion direction.
[0021]
An elastic resin layer 25 made of a rubber body (chloroprene rubber or the like) or a closed-cell elastic resin is adhered to the base side of each sliding guide member 13 so as to wrap the base side, as shown in FIGS. As described above, in a state where the bag body 1 is expanded, in cooperation with the elastic resin layer 7 provided on the bag body 1, a gap between the pipe inner surface 3 sandwiching the slide guide member 13 and the bag body 1 is sealed. A seal mechanism 26 is provided.
[0022]
FIG. 5 shows that the bag body 1 of the fluid blocking bag A is inserted into the gas pipe B in a reduced diameter state as described above, and the sliding guide member 13 is slid on the inner surface 3 of the pipe. And a state in which the short pipe 4 and the hard pipe 5 are pushed into each other and moved to a predetermined obstructed portion.
[0023]
The gas pipe B has a step portion D formed at a connection portion of the elbow B2. When the straight pipe portion is moved, the bag body 1 (indicated by 1a in the figure) is provided with elasticity of each sliding guide member 13. When the bag body 1 (indicated by 1b in the figure) moves while being held near the center in the pipe radial direction by the force and moves the elbow B2, each sliding guide member 13 comes into contact with the pipe inner surface 3. The bag body 1 is elastically deformed in the pipe radial direction according to the state, and smoothly passes through the step D in a state where the bag body 1 is held near the center in the pipe radial direction.
[0024]
Then, the bag body 1 (indicated by 1c in the figure) that has moved to the position to be closed is inflated and deformed by pressurized air supplied through the hard tube 5 and the short tube 4, and the outer peripheral surface 2 of the bag body 1 is deformed. Is elastically adhered to the tube inner surface 3 side.
[0025]
At this time, as shown in FIGS. 3 and 4, the gap between each slide guide member 13 and the pipe inner surface 3 is sealed by the elastic resin layer 25 adhered to the slide guide member 13, and each slide guide member 13 The gap between the bag body 1 and the bag body 1 is sealed by the elastic resin layer 25 adhered to the slide guide member 13 and the elastic resin layer 7 provided on the bag body 1, so that the inside of the pipe can be reliably closed. .
[0026]
[Other embodiments]
1. The in-pipe obturator according to the present invention is provided with a separate elastic body for elastically biasing the slide guide member outward in the pipe radial direction, and providing the slide guide member elastically deformable inward in the pipe radial direction. May be.
2. The in-pipe closure device according to the present invention is provided such that both or one of a pair of support portions that support both end portions of the sliding guide member at front and rear positions in the pipe insertion direction of the closure member are immovably provided on the closure member side. Is also good.
3. The in-pipe obstruction device according to the present invention may be a liquid sealing material applied to the foamed elastic resin layer of closed cells provided on the outer peripheral surface of the sliding guide member or the bag body, or a continuous cell provided on the outer peripheral surface of the sliding guide member or the bag body. The foamed elastic resin layer is impregnated with a liquid sealing material, and in a state where the diameter of the closing member is increased, the gap between the inner surface of the tube and the closing member sandwiching the sliding guide member can be effectively sealed. Is also good.
4. The pipe closing device according to the present invention may be used for closing the inside of various fluid pipes such as water pipes and sewer pipes.
[Brief description of the drawings]
FIG. 1 is a side view of an in-pipe obturator. FIG. 2 is a longitudinal sectional view of the in-pipe occluder. FIG. 3 is a side view of an in-pipe obturator in which a closing member is expanded and deformed in a pipe. FIG. 5 is a cross-sectional view taken along line IV. FIG. 5 is an explanatory view of movement of a closing member in a pipe.
DESCRIPTION OF SYMBOLS 1 Closing member 3 Pipe inner surface 13 Sliding guide member 14 Supporting part 26 Sealing mechanism
