JP2007232099A - Gas shut-off method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply shut off the flow of gas in a pipe simultaneously with cutting the pipe. <P>SOLUTION: In this gas shut-off method, the flow of gas in the pipe is shut off in the active state of the pipe. A plate-like body 4 covering the cut end of an object pipe A to be cut is provided with a plate-like plate body B having a blade part 5 wider than the outer diameter of the object pipe. A first holder C is provided, and the first holder includes: a holding part having an object pipe passing space inside and holding the plate-like body to be slidable in the passing space; a fixed part 7 to the inserted object pipe in the passing space; and a sealing part 8 fixed to the object pipe, and sealing the passing space to the outside in the state of holding the plate-like blade body on the holding part. The object pipe is inserted in the passing space, the first holder is fixed, and in the state of holding the plate-like blade body, the passing space is sealed to the outside, and the object pipe is cut by the plate-like blade body, whereby the pipe end part 28 is formed on both sides of the plate-like blade body, the pipe ends are air-tightly surrounded with the plate-like blade body and the first holder to shut off the flow of gas in the pipe. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas blocking method for blocking the flow of gas in a tube in an active tube state.

When the gas pipe is cut in a live pipe state, the gas flow in the pipe is at least at one position upstream in the gas flow direction of the planned cutting position so that the gas in the pipe does not spout when the pipe is cut. Must be shut off in a live tube state in advance.
For this reason, in the conventional gas shut-off method, a through hole is formed in at least one tube wall on the upstream side in the gas flow direction of the planned cutting portion, and a gas ejection prevention tool such as a gas bag is inserted into the gas pipe from the through hole. It is installed to block the flow of gas in the pipe, but when forming a through hole for mounting a gas blow prevention device on the pipe wall, the gas pipe After covering the outer surface with a no-blow bag, a gas blowout prevention tool is mounted in the gas pipe (this is a well-known conventional technique and information on prior art documents cannot be disclosed).

For this reason, in order to cut off the flow of the gas in the pipe in advance so that the gas in the pipe does not spout in connection with the cutting of the pipe, in addition to the pipe cutting tool, no blow bag, punching tool, fixing tool for the punching tool, It is necessary to prepare various equipment and materials such as a gas bag and a pump for inflating the gas bag, and there is a disadvantage that a series of shut-off processes becomes complicated.
The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to easily cut off the flow of gas in the pipe in the active pipe state simultaneously with the cutting of the pipe.

A first characteristic configuration of the present invention is a gas blocking method for blocking the flow of gas in a tube in an active tube state, and a plate-like body having a size capable of covering the cut end of a tube to be cut from the tube axis direction. And preparing a plate-like blade body provided with a blade portion wider than the outer diameter of the cutting object pipe, and having an insertion space through which the cutting object pipe can be inserted, and the plate-like blade body. A holding portion that is slidably held in a direction intersecting the insertion direction of the cutting target tube in the insertion space; and a fixing portion that is fixable to the cutting target tube inserted in the insertion space. A first holder including a seal portion that is fixed to the tube to be cut and that can seal the insertion space from the outside in a state where the plate-like blade body is held by the holding portion. Preparing the first holder by inserting the tube to be cut into the insertion space. The cutting target tube is fixed to the cutting target tube, and the insertion space is sealed with respect to the outside in a state where the plate blade is held by the holding portion, and the plate cutting blade is slid to move the cutting target tube. By cutting, tube end portions are formed on both sides sandwiching the plate-like blade body, and the tube end portions are hermetically surrounded by the plate-like blade body and the first holder, so that the flow of gas in the tube The point is to shut off.

[Action and effect]
A plate-like blade body having a blade part wider than the outer diameter of the tube to be cut and an insertion space through which the tube to be cut can be inserted are provided inside, and the plate-like blade body is to be cut within the insertion space. A first holder having a holding portion that is slidably held in a direction intersecting with a tube insertion direction and a fixing portion that can be fixed to a cutting target tube inserted through the insertion space is used. Then, the cutting target pipe is inserted into the insertion space of the holding portion, the first holder is fixed to the cutting target pipe, and the plate-like blade body is slid to cut the cutting target pipe.
And in cutting | disconnection of a cutting object pipe, with respect to the plate-shaped blade body which provided the blade part in the plate-shaped body of the magnitude | size which can coat | cover the cutting | disconnection edge part of a cutting object pipe | tube from a tube axial center direction, and a cutting object pipe A plate-shaped blade using a first holder having a seal portion that is capable of sealing and sealing the insertion space of the holding portion with respect to the outside while being fixed and holding the plate-like blade body on the holding portion With the body held by the holding part, the insertion space is sealed from the outside, and the pipe ends are formed on both sides of the plate blade by cutting the pipe to be cut. Simultaneously with the cutting of the tube, the plate edge and the first holder can hermetically surround the tube ends so that the flow of the gas in the tube can be easily cut off in the live tube state.

  According to the second characteristic configuration of the present invention, after blocking the flow of the gas in the tube, the tube end portion on the downstream side in the gas flow direction of the tube end portion is removed from the first holder so that the tube can be closed. A second holder holding the elastic elastic closing member inside the cylindrical member so that the elastic closing member can be pushed out, and the elastic closing member is pushed to the pipe end on the upstream side of the gas flow direction with the plate blade interposed therebetween The plate-shaped blade body is moved so that the tube end on the upstream side in the gas flow direction opens toward the elastic closing member so as to be opposed to the first holder. The elastic blocking member is pushed into the pipe from the pipe end on the upstream side in the gas flow direction.

[Action and effect]
After blocking the flow of gas in the tube, the tube end on the downstream side in the gas flow direction of the tube ends formed on both sides of the plate blade is removed from the first holder, and the tube can be closed freely. The second holder, which holds the closing member inside the cylindrical member so that it can be pushed out, is arranged so that the elastic closing member faces the pipe end on the upstream side in the gas flow direction across the plate blade in the pushing direction. The airtightly fixed to the first holder, the plate-like blade body is moved so that the tube end portion opens toward the elastic closing member, and the elastic closing member is removed from the tube end portion on the upstream side in the gas flow direction. Because it is pushed into the pipe, it prevents the gas from being blown out even if the pipe part that is no longer needed or the pipe part that is scheduled to be replaced with a new pipe is cut and removed, even if the pipe that should remain While pushing the elastic blocking member from the end of the tube into the tube, You can close the tube end to allow removal of Jo blade.

  According to a third characteristic configuration of the present invention, after the elastic closing member is pushed into the pipe from the other pipe end, the first holder, the plate-like blade body and the second holder are removed, and the other This is in that the pipe end portion and the closing pseudo tube member are connected by a mechanical joint.

[Action and effect]
After the elastic closing member is pushed into the tube from the other tube end, the first holder, the plate blade and the second holder are removed, and the other tube end and the closing pseudo tube member are mechanically connected. Since the joint is connected, the pipe end can be reliably closed without particularly processing the pipe end.

Embodiments of the present invention will be described below with reference to the drawings.
1-7 are cylindrical shapes that are no longer necessary in the buried gas pipe in which the gas supply pipe A to the user is branched and connected to the main branch (not shown) for city gas supply buried under the road. 1 shows a gas shutoff method according to the present invention in which the flow of gas in the pipe is cut off in the active pipe state in the supply pipe portion near the public-private boundary in order to cut and remove the supply pipe (pipe to be cut) A near the public-private boundary. 8 to 11 show shut-off jigs B, C, and D used for the gas shut-off method.

  As the shut-off jig, as shown in FIG. 8, a plate-like blade body B for cutting the supply pipe A, and a holding portion 1 for holding the plate-like blade body B as shown in FIGS. And a second holder D holding an elastic closing member 2 capable of closing the inside of the supply pipe as shown in FIG.

  As shown in FIG. 8, the plate-like blade body B has a plate-like body 4 having a size capable of covering the cut end portion (tube end portion) 3 of the supply pipe A from the axial direction of the pipe. A blade portion 5 wider than the outer diameter is provided, and this blade portion 5 has a pair of left and right curved blade portions 5a that are recessed in an arc shape toward the center of the plate-like body 4 in the width direction. It is formed in a shape that intersects at the central position, and the central portion in the width direction is sharpened.

  As shown in FIGS. 9 and 10, the first holder C includes an insertion space 6 into which the supply pipe A can be inserted, and a plate-like blade B within the insertion space 6 of the supply pipe A. With respect to the supply pipe A, a holding part 1 that is slidably held in an intersecting direction substantially orthogonal to the insertion direction, a fixing part 7 that can be fixed to the supply pipe A that is inserted into the insertion space 6, and In a state where the plate-like blade body B is held in the holding portion 1 while being fixed, a sealing portion 8 capable of sealing the insertion space 6 from the outside is provided.

  The holding portion 1 is constituted by a slide frame 10 having a flat slide hole 9 through which the plate-like blade body B is slidably inserted, and the slide frame 10 has substantially the same outer diameter as the supply pipe A. The fixing portion 7 is configured by penetrating the tube insertion hole 11 having an inner diameter and providing a cylindrical body 16 having an inner diameter substantially the same as the outer diameter of the supply tube A on both sides of the slide frame 10 so as to be concentric with the tube insertion hole 11. Thus, an insertion space 6 extending between the inside of the slide frame 10 and the insides of the left and right cylindrical bodies 16 is formed.

  The slide frame 10 has a guide frame 12 and a plate-like shape formed on a first frame 13 in which a guide frame 12 into which a side edge of the plate-like blade B is inserted is formed in a U shape along the tube insertion hole 11. A slide-like hole 9 is formed by assembling a plate-like second frame body 15 having a thick plate portion 14 fitted into a stepped portion with the blade body B.

  And as shown in FIG. 10, the 1st frame 13 is provided so that it can mount | wear from a pipe radial direction in the state which surrounds the supply pipe outer peripheral surface which pinches | interposes a cutting | disconnection plan location over the perimeter, First and second holder portions 17 and 18 connected up and down so as to be adjacent to each other, and a second frame 15, and third and fourth holder portions 19 connected up and down so as to be adjacent in the pipe circumferential direction. , 20 and is configured so as to be integrally assembled with screws or the like, and a rubber sealing material 21 sandwiching the outer peripheral surface portion of the plate-like blade body B inserted through the slide hole 9 from both sides is provided for each holder portion 17, 18, 19 and 20, and rubber seal material 22 is attached between each holder part 17, 18, 19, 20 and the supply pipe A and between the holder parts 17, 18, 19, 20. It is fixed to the tube A, and the holder 1 In a state in which are held the blade B, you have configured sealable seal unit 8 through the space 6 to the outside.

  In place of the third and fourth holder portions 19 and 20, the second holder D is replaced with a bottomed cylindrical member 23 that holds the elastic closing member 2 that can close the inside of the tube and that can be pushed out. 1, provided with a thick plate portion 24 and a rubber seal material 25 fitted into a step portion between the guide frame 12 and the plate-like blade body B so that the second holder portions 17 and 18 can be hermetically fixed with screws or the like. A flange 26 similar to that of the second frame 15 is provided, and a pusher 27 of the elastic closing member 2 is provided so that it can be pushed and pulled from the outside of the holder.

A gas shutoff method according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the first holder C is fixed to the supply pipe A in a state where the supply pipe A is inserted into the pipe insertion hole 11 of the holding unit 1, and the guide frame 12 of the holding unit 1 is plate-shaped. The blade body B is held, the insertion space 6 is sealed from the outside, and the plate-like blade body B is inserted along the guide frame 12 toward the supply pipe A using a manual hydraulic cylinder or the like. By sliding and moving across the space 6 and cutting the supply tube A as shown in FIG. 2, tube ends 28 are formed on both sides sandwiching the plate blade B, and the tubes The end portion 28 is hermetically surrounded by the plate-like blade body B and the first holder C to block the flow of gas in the pipe.

  Next, the third and fourth holder portions 19 and 20 are removed, and as shown in FIG. 3, the tube end portion 28 on the downstream side in the gas flow direction of the tube end portion 28, that is, the user side tube end portion. 29 is removed from the first holder C, and instead of the third and fourth holder portions 19 and 20, the second holder D is sandwiched between the elastic closing member 2 and the plate-like blade B as shown in FIG. It fixes to the 1st, 2nd holder parts 17 and 18 airtightly so that it may oppose the pipe end part 28 in the gas flow direction upstream, ie, this branch pipe side pipe end part 30, in the extrusion direction.

  Next, as shown in FIG. 5, the plate-like blade body B is slid so that the main pipe side pipe end portion 30 opens toward the elastic closing member 2, and the elastic closing member 2 is moved to the main pipe side pipe end. After elastically reducing the diameter from the portion 30 and pushing it into the pipe, the branch pipe side pipe end 30 is temporarily closed, and as shown in FIG. 6, the first and second holder parts 17 and 18 and the plate blade The body B and the second holder D are removed, and the branch pipe side pipe end 30 and the closing pseudo pipe member 31 are connected by a mechanical joint 32 as shown in FIG.

[Other Embodiments]
1. The gas blocking method according to the present invention may use a first holder that is preliminarily equipped with a plate-like blade so as to be movable.
2. The gas cutoff method according to the present invention may cut a metal cutting target tube or a resin cutting target tube.
3. The gas blocking method according to the present invention may be restored by blocking the flow of gas in the pipe and performing a desired operation, and then connecting both pipe ends to each other with a mechanical joint or the like.
4). In the gas shutoff method according to the present invention, after shutting off the flow of gas in the pipe, the pipe end on the downstream side in the gas flow direction is removed from the first holder, and the pipe end of the newly installed pipe is replaced with the pipe end. May be connected to the remaining pipe end with a mechanical joint or the like.

Explanatory diagram of gas shutoff method Explanatory diagram of gas shutoff method Explanatory diagram of gas shutoff method Explanatory diagram of gas shutoff method Explanatory diagram of gas shutoff method Explanatory diagram of gas shutoff method Explanatory diagram of gas shutoff method Plan view of plate blade Perspective view of first holder Exploded perspective view of first holder (B) Perspective view of the second holder (b) Vertical section of the second holder

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holding part 2 Elastic closure member 3 Cutting edge part 4 Plate-like body 5 Blade part 6 Insertion space 7 Fixing part 8 Sealing part 23 Cylindrical member 28 Pipe end part 31 Pseudo pipe member 32 Mechanical joint A Cutting object pipe B Plate-like blade Body C 1st holder D 2nd holder

Claims (3)

A gas shutoff method for shutting off the flow of gas in a pipe in a live pipe state,
While preparing a plate-like blade body provided with a blade portion wider than the outer diameter of the tube to be cut, on a plate-like body having a size capable of covering the cutting end portion of the tube to be cut from the tube axis direction,
A holding portion that includes an insertion space through which the cutting target pipe can be inserted, and that holds the plate-like blade body in the insertion space so as to be slidable in a direction intersecting the insertion direction of the cutting target pipe. And a fixing portion that can be fixed to the cutting target tube that is inserted into the insertion space, and is fixed to the cutting target tube, and the holding blade holds the plate-like blade body In a state, a first holder provided with a seal portion capable of sealing the insertion space with respect to the outside is prepared,
The tube to be cut is inserted into the insertion space, the first holder is fixed to the tube to be cut, and the insertion space is made to the outside in a state where the plate blade is held by the holding portion. Sealed,
By sliding the plate-like blade body to cut the tube to be cut, tube end portions are formed on both sides sandwiching the plate-like blade body, and these tube end portions are connected to the plate-like blade body and the A gas shut-off method in which the gas flow in the pipe is shut off by being hermetically surrounded by the first holder. After blocking the flow of the gas in the pipe, the pipe end on the downstream side in the gas flow direction of the pipe end is removed from the first holder,
A second holder that is held inside the cylindrical member so that the elastic closing member that can close the inside of the tube can be pushed out, and the tube end on the upstream side in the gas flow direction with the elastic closing member sandwiching the plate-like blade body To be airtightly fixed to the first holder so as to face the part in the pushing direction,
The plate-like blade body is moved so that the pipe end on the upstream side in the gas flow direction opens toward the elastic closing member, and the elastic closing member is moved away from the pipe end on the upstream side in the gas flow direction. The gas shut-off method according to claim 1, wherein the gas is pushed into the pipe.   After the elastic closing member is pushed into the tube from the other tube end, the first holder, the plate blade and the second holder are removed, and the other tube end and the closing pseudo The gas cutoff method according to claim 2, wherein the pipe member is connected with a mechanical joint.

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