JP7123331B2 - no blow bag - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a no-blow bag capable of attaching and detaching pipes in which gas is flowing (hereinafter referred to as live pipes) without leaking gas to the outside.

As a conventional no-blow bag, there is one that is used when installing a new pipe branched from a live pipe, as disclosed in Patent Document 1, for example.

The no-blow bag disclosed in Patent Document 1 has holes in the lower surface and the upper surface of a cylindrical bag whose interior is visible. A rubber plate having a circular hole is attached to the lower and upper surfaces of the bag so as to match the hole. In other words, the outside and inside of the bag are open. Through this one hole, the bag is fitted over a saddle attached to the live pipe. An operator puts his arms through the other hole and works inside the bag. Both holes clamp the saddle and the operator's hands and arms by the elastic force of the rubber plate, so that the gas flowing out of the live pipe during work stays in the bag without leaking out of the bag through both holes. The operator can work while the gas remains in the bag, and the gas will not leak out of the bag during work.

JP-A-2000-18479

However, although the no-blow bag having such a configuration can be used for installing a branch pipe from a live pipe, it cannot be used for other work such as attaching or detaching the live pipe itself.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a no-blow bag that allows the attachment and detachment of live pipes without gas leakage.

In order to achieve this object, the no-blow bag according to the present invention is
In a gas pipe comprising a fixed pipe and a connected pipe which is rotatable about its axis and one end of which is threadedly connected to said fixed pipe, attaching and detaching said connected pipe without stopping gas supply. A blowback bag for working,
a tube-shaped bag that covers a connecting portion between the fixed pipe and the connected pipe for performing the attachment/detachment work;
a first sealing body that is pierced by the fixed pipe and adheres to the outer peripheral surface of the fixed pipe;
a second blocking body that is penetrated by the connected pipe and is in close contact with the outer peripheral surface of the connected pipe and capable of rotating the connected pipe about its axis;
a third closure that allows the hands and arms of an operator to be placed inside the bag and is in close contact with the surroundings of the hands and arms;
A working space is formed between the third blocking body and the connecting portion in the inside of the bag body so that a worker can attach and detach the connected pipe by hand,
The second blocking body is composed of a chloroprene rubber sponge or a rubber member whose inner peripheral surface has a reduced friction coefficient by surface treatment ,
A stepped slit is formed in the second blocking body from the upper end to the lower end,
The slits are, in order from top to bottom, an upper slit that is formed straight in the axial direction, a middle slit that is continuous with the upper slit and is formed straight in the direction perpendicular to the axial direction, and a middle slit that is continuous with the middle slit and is formed in the axial direction. a straight lower slit;
The second blocking body has a split structure that can be split open from the slit, and can be attached to the connected pipe from the direction perpendicular to the axis of the connected pipe .

Further, in the no-blow bag according to the present invention, the first sealing body is a rubber body integrally formed with an annular plate portion having an open center and a bell mouth portion projecting outward from the plate portion. is more preferable.

According to the present invention, the bag covers the connecting portion from which gas flows out during work, the first blocking body is the fixed pipe, the second blocking body is the connected pipe, and the third blocking body is the arm of the operator. Since they are in close contact with each other, it is possible to work while keeping the gas flowing out from the connection part inside the no-blow bag. That is, it is possible to attach and detach live pipes without gas leakage to the outside of the no-blow bag.

Further, according to the present invention, at least one of the first blocking body and the second blocking body is arranged at a position eccentric from the center of the one end face or the other end face, so that the first blocking body or the second blocking body The distance from the second closure to the wall of the bag can be shortened. Therefore, the pipe can be laid close to the wall, that is, the distance from the wall to the pipe can be reduced. As a result, unobtrusive piping work can be performed.

It is a figure which shows the use condition of the no-blow bag which concerns on embodiment of this invention. It is a figure of the bag body which concerns on the same no-blow bag. It is a three-dimensional view of the 2nd blocking body which concerns on the same no-blow bag. It is a cross-sectional view of the main part of the same no-blow bag. It is a figure which shows the usage procedure of the same no-blow bag. FIG. 6 is a diagram showing the next procedure of FIG. 5; FIG. 7 is a diagram showing the next procedure of FIG. 6; In particular, (a) shows the procedure for attaching the second blocking body to the connected pipe, and (b) shows the subsequent procedure. FIG. 8 is a diagram showing the next procedure of FIG. 7; FIG. 9 is a diagram showing the next procedure of FIG. 8; In particular, (a) shows the procedure for removing the pipe to be connected from the joint member, and (b) shows the procedure for attaching the plug to the joint member. FIG. 10 is a diagram showing another usage example of the no-blow bag according to the present invention;

The no-blow bag according to the embodiment of the present invention is a pipe in which gas is flowing (hereinafter referred to as a live pipe), especially a service pipe for taking gas from a public gas pipe into a facility such as a house. , a fixed pipe to be buried and a connected pipe connected to the fixed pipe and led to the ground.

The work of removing live pipes is performed, for example, when removing live pipes connected to a facility where gas supply is no longer needed, or when replacing deteriorated pipes with new ones.

E shown in FIG. 1 is the ground after excavating to expose the buried pipe. Moreover, W is the outer wall of facilities, such as a house. As shown in FIG. 1, the fixed pipe 1 is dug up so as to be parallel to the ground E. As shown in FIG. An elbow 4 a is attached to one end of the fixed pipe 1 . A connected pipe 2 parallel to the outer wall W is screwed into the elbow 4a. As a result, the fixed pipe 1 and the connected pipe 2 are connected to form a live pipe P having an L shape. Although not shown in FIG. 1, the connected pipe 2 is connected at its upper end to a horizontal pipe, and this horizontal pipe penetrates the outer wall W and is piped to the facility, thereby supplying gas to the facility. there is In order to remove the connected pipe 2 from the fixed pipe 1, the connected pipe 2 is removed from the elbow 4a, and after removal, a plug or the like is attached to one end of the elbow 4a in order to stop the gas flowing out from one end of the elbow 4a. It is something to do. Here, when the connected pipe 2 is removed from the elbow 4a, a no-blow bag 10 is used to prevent gas from flowing out into the atmosphere.

As shown in FIG. 1, the no-blow bag 10 includes a cylindrical tubular bag body 20 that is flexible and whose interior is visible, a first blocking body 30 that is penetrated by a fixed pipe 1, and a connected pipe 2 that is penetrated. and a third blocking body 50 pierced by the operator's arm 80R.

The bag body 20 is made of vinyl chloride, for example, and is arranged so as to cover the connection point C between the fixed pipe 1 and the connected pipe 2, as shown in FIG.

As shown in FIG. 2, a hole 21a is formed at an eccentric position on one end surface 21 of the bag body 20. As shown in FIG. A first blocking member 30 is provided on the one end surface 21 so as to be aligned with the hole 21 a and is penetrated by the fixed pipe 1 and is in close contact with the outer peripheral surface of the fixed pipe 1 .

The first blocking member 30 is a rubber body in which an annular plate portion 31 with an open center and a bell mouth portion 32 protruding from the plate portion 31 toward the outside of the bag body 20 are integrally formed.

The plate portion 31 is formed to be larger than the hole 21a, and the portion of the plate portion 31 formed to be larger than the hole 21a is adhered or welded to the one end face 21 with an adhesive. , a first closure 30 is attached to one end face 21 .

The bell mouth portion 32 has an opening portion 33 that is continuous with the opening of the plate portion 31 .

Since the diameter of the bell mouth portion 32 gradually decreases from the proximal end to the distal end, the opening 33 on the inner peripheral surface is also formed so that the diameter decreases toward the distal end. When the fixed tube 1 penetrates the first blocking member 30, the opening 33 widens due to the elastic force of the rubber body. Therefore, the inner peripheral surface of the first blocking member 30 is in close contact with the outer peripheral surface of the fixed pipe 1 . Since the diameter of the bell mouth portion 32 decreases toward the tip, tightening due to the elastic force becomes stronger toward the tip of the bell mouth portion 32, and the degree of adhesion between the first blocking body 30 and the fixed pipe 1 increases.

Further, as shown in FIG. 1, an adhesive tape 70a is wound around the outer periphery of the bell mouth portion 32 to fix the position of the first blocking member 30 with respect to the fixed pipe 1. As shown in FIG. In addition, since the adhesive tape 70a tightens the first closing body 30, the adhesion of the first closing body 30 to the fixed tube 1 is further increased.

As shown in FIG. 1, at an eccentric position on the other end surface 22 of the bag body 20, that is, at a position eccentric from the center of the other end surface 22 in the direction of the outer wall W, the connected pipe 2 penetrates and the outer circumference of the connected pipe 2 is provided. A second closure 60 is provided that adheres to the surface.

As shown in FIG. 2, a hole 22a is formed in the other end face 22 at a position where the second blocking member 60 is provided. A connecting portion 40 consisting of is provided.

A bulge-shaped fitting portion 41 is formed along the entire circumference of the edge of the opening 42 .

As shown in FIGS. 1 and 3, the second closure 60 is cylindrical. The second blocking body 60 is made of chloroprene rubber sponge, for example.

As shown in FIG. 3, a stepped slit 62 is formed in the second blocking body 60 from the upper end to the lower end. The slits 62 are, in order from top to bottom, an upper slit 62a that is formed straight in the axial direction, a middle slit 62b that is continuous with the upper slit 62a and is formed straight in a direction perpendicular to the axial direction, and an axial slit that is continuous with the middle slit 62b. It consists of a lower slit 62c formed straight in the direction.

The second blocking member 60 has a split structure that can be split open from the slit 62 . Since the second blocking body 60 has a split structure, the second blocking body 60 can be attached to the connected pipe 2 from the direction orthogonal to the axis of the connected pipe 2 .

After the second blocking member 60 is attached to the connected pipe 2, the adhesive tape 70b is wrapped around the outer peripheral surface of the second blocking member 60, as shown in FIGS. By tightening the second blocking body 60 with the adhesive tape 70 b , the second blocking body 60 having a split structure is crimped to the connected pipe 2 .

Here, FIG. 4 shows a state in which the connected pipe 2 penetrates the second blocking body 60, and as shown in FIGS. 4, a fitting groove 61 is formed on the outer peripheral surface near the lower end thereof. The second blocking body 60 and the bag body 20 are connected by fitting the fitting portion 41 of the connecting portion 40 into the fitting groove 61 . The diameter of the opening 42 of the connecting portion 40 shown in FIG. 2 is smaller than the diameter 60D of the second blocking body 60 shown in FIG. 4 and the groove diameter 61D. The connecting portion 40 can be fitted into the fitting groove 61 by widening the . Since the diameter of the opening 42 is smaller than the groove diameter 61D, after the fitting portion 41 is fitted into the fitting groove 61, the inner wall 61a of the fitting groove 61 is tightened by the elastic force to return to the original diameter. Furthermore, at this time, since the fitting portion 41 has a bulging shape, and the second closing body 60 is made of chloroprene rubber sponge and is softer than the fitting portion 41, the fitting portion 41 is positioned above the fitting groove 61. It bites into and contacts the wall 61b and the lower wall 61c. As a result, after the fitting portion 41 is fitted into the fitting groove 61, the fitting portion 41 does not come off from the fitting groove 61, and the fitting portion 41 and the fitting groove 61 are in contact with each other without gaps.

As shown in FIG. 2, a hole 23a is formed in a side surface 23 of the bag body 20 at a position opposite to the hole 21a or the hole 22a across the center of the one end surface 21 or the other end surface 22. As shown in FIG. 1, the position of the hole 23a corresponds to the position on the opposite side of the ground E and the outer wall W with the live pipe P on the side surface 23 of the bag body 20 interposed therebetween. A third blocking body 50 is provided in alignment with the hole 23a so as to be penetrated by the arm 80R of the operator and closely attached to the outer periphery of the arm 80R.

The third blocking member 50 is made of an annular plate-shaped rubber body having an opening 51 in the center.

The opening 51 is formed to have a smaller diameter than the arm 80R. When the arm 80R penetrates the third blocking member 50, the opening 51 expands due to the elastic force of the rubber body. The blocker 50 is in close contact with the outer circumference of the arm 80R.

Here, since the first blocking body 30 penetrating the fixed pipe 1 and the second blocking body 60 penetrating the connected pipe 2 are eccentric from the center of the one end face 21 and the other end face 22, respectively, The connection point C with the connected pipe 2 is positioned rightward within the no-blow bag 10 in the state shown in FIG. In addition, as described above, the third blocking body 50 through which the operator's hands and arms 80R penetrate during work has the hole 21a (first blocking body 30) or the hole 22a (second 2 on the opposite side of the block 60). Due to the positional relationship between the third blocking body 50 and the connection point C, the distance between the third blocking body 50 into which the arm 80R is inserted and the connection point C can be increased, and the work space in which the worker can work. Widely forms J.

As described above, the bag body 20 covers the connection point C, the first blocking body 30 is in close contact with the fixed pipe 1, the second blocking body 60 is in close contact with the connected pipe 2, and the third blocking body 50 is in contact with the arm 80R. Therefore, even if the connected pipe 2 is removed inside the bag body 20 by the arm 80R and the gas flows out of the live pipe P, the flowing gas remains inside the bag body 20 and does not flow outside the bag body 20. It never leaks out. That is, by sealing the bag body 20 with the first to third sealing bodies, it is possible to prevent gas from leaking out of the bag body 20 .

Furthermore, since the chloroprene rubber sponge is used as the second blocking member 60, the friction generated on the contact surface between the second blocking member 60 and the connected pipe 2 can be reduced as compared with the case where a rubber member is simply used. . Therefore, the connected pipe 2 in close contact with the second blocking body 60 can be easily rotated while being in close contact with the second blocking body 60, so that the connected pipe 2 can be easily removed from the elbow 4a. It should be noted that the second blocking member 60 does not have to be made of chloroprene rubber sponge, as long as it can be easily rotated while in close contact with the connected pipe 2 . For example, when a rubber member is used as the second blocking member 60, the inner peripheral surface may be surface-treated to reduce the coefficient of friction of the inner peripheral surface.

The slit 62 of the second blocking body 60 has a middle slit 62b formed straight in the direction perpendicular to the axial direction at its intermediate part, so that the occurrence of misalignment and the occurrence of twisting when pulled are prevented. can be effectively prevented.

Furthermore, since the middle slit 62b is formed straight in the direction orthogonal to the axis, when the second blocking body 60 is attached to the connected pipe 2, the slit-constituting surfaces of the middle slit 62b are brought into contact with each other, thereby It is possible to prevent the blocking member 60 from shifting in the axial direction across the slit 62 . Therefore, it is possible to prevent the fitting groove 61 formed around the outer periphery of the second blocking body 60 from being displaced along the slit 62 after the second blocking body 60 is attached. The fitting groove 61 without deviation can facilitate the fitting of the fitting portion 41 .

Here, the adhesive tape 70a is used as a material for tightening the first blocking member 30, and the adhesive tape 70b is used as a material for tightening the second blocking member 60. Instead of these, a belt-like object or a string-like object may be used. etc. may be used.

Next, a procedure for removing live tubes using the no-blow bag 10 will be described.

In FIG. 5, first, the cock 2c provided in the connected pipe 2 is closed to prevent the gas flowing from the fixed pipe 1 at any time from flowing to the downstream side of the cock 2c. After that, the connected pipe 2 is removed from the pipeline and its upper end is closed with a cock or the like. At this time, since gas is stopped by the cock 2c, gas does not flow out from the connected pipe 2. - 特許庁The opening 33 of the first blocking body 30 is widened and the connected pipe 2 is passed through the first blocking body 30 of the bag body 20 . After passing the connected pipe 2 through the first blocking body 30 , the opening 42 of the connecting portion 40 of the bag 20 is widened and the connected pipe 2 is passed through this opening 42 . As a result, the bag body 20 is pierced by the connected pipe 2 .

In this state, as shown in FIG. 6, the bag body 20 is moved to a position where it can cover the connection point C. Then, as shown in FIG. That is, the first blocking body 30 is arranged at the position of the fixed pipe 1, and the connecting portion 40 is arranged at the position of the connected pipe 2, respectively. Once the position of the bag body 20 is determined, the adhesive tape 70a is wrapped around the outer circumference of the first closing body 30 to fix the position of the first closing body 30. As shown in FIG. The first blocking member 30 is firmly adhered to the fixed tube 1 by the adhesive tape 70a and the elastic force of the rubber.

Next, the second blocking body 60 is attached to the connected pipe 2 . As shown in FIG. 7( a ), the second blocking member 60 is split open from the slit 62 and wrapped around the connected pipe 2 so as to cover the connected pipe 2 in the direction orthogonal to the axis. The inner peripheral surface of the second closing body 60 is in close contact with the connected pipe 2 due to the elastic force that tends to return to the original cylindrical shape from the open state. At this time, the second blocking body 60 attached to the connected pipe 2 is positioned near the bag body 20 .

As shown in FIG. 7(b), an adhesive tape 70b is wound around the outer peripheral surface of the second blocking member 60. As shown in FIG. As a result, the second blocking body 60 is crimped to the connected pipe 2 , and the split structure second blocking body 60 does not come off from the connected pipe 2 by mistake. After that, the opening 42 of the connecting portion 40 of the bag body 20 is widened by hand, and the fitting portion 41 is fitted into the fitting groove 61 of the second closing body 60 . The fitting portion 41 tightens the inner wall 61a of the second blocking body 60 by an elastic force that tends to return to the original diameter, and bites into and contacts the upper wall 61b and the lower wall 61c. Thereby, the space between the fitting portion 41 and the fitting groove 61 is sealed.

Next, the connected pipe 2 is removed.

As shown in FIG. 8, the operator puts one arm 80R into the bag body 20 from the third blocking body 50. As shown in FIG. Then, while grasping the second blocking body 60 with the other arm 80L outside the bag body 20 to prevent the second blocking body 60 from rotating, the connected pipe 2 is grasped with the one arm 80R inside the bag body 20. to rotate. At this time, since the second blocking member 60 is gripped by the other arm 80L, the connected pipe 2 does not rotate as the connected pipe 2 rotates. Specifically, since the chloroprene rubber sponge is used as the second blocking member 60, the friction generated on the contact surface between the second blocking member 60 and the connected pipe 2 can be made smaller than when a rubber member is simply used. , and only the connected pipe 2 can be easily rotated. Furthermore, since the inside of the bag 20 can be visually recognized, the work inside the bag 20 can be easily performed while looking at the inside of the bag 20 from the outside of the bag 20 .

As shown in FIG. 9A, when the connected pipe 2 is rotated, the screw 2t cut at the end of the connected pipe 2 is removed from the elbow 4a, thereby removing the connected pipe 2 from the elbow 4a. Then, the gas flows out from the removed part. Even if the gas flows out, the first sealing body 30 is in close contact with the fixed pipe 1, the second sealing body 60 is in close contact with the connected pipe 2, and the third sealing body 50 is in close contact with the arm 80R. It serves as a seal, and the gas flowing out from the elbow 4a does not leak out of the no-blow bag 10. - 特許庁In addition, in the second blocking body 60, the upper slit 62a is compressed in the width direction of the upper slit 62a by tightening the adhesive tape 70b, and the slit width is narrowed. is extremely low.

As shown in FIG. 9(b), while supporting the connected pipe 2 with the arms 80L outside the no-blow bag 10, insert it into the no-blow bag 10 in advance with the arms 80R inside the no-blow bag 10. Attach the plug 5 to the end of the elbow 4a. This plugs the end of the elbow 4a to prevent gas from flowing out. After that, the arm 80R is pulled out from the third blocking body 50, the adhesive tape 70a wrapped around the first blocking body 30 is removed, the first blocking body 30 is moved to the end of the fixed tube 1, and the no blow bag is carried out. 10 is removed.

With the above procedure, the removal of the live pipe P leading to the facility where the gas supply is no longer needed is completed.

Although the removal (removal) of the L-shaped live pipe P has been described above, as shown in FIG. . Even when such a live tube P is used, the live tube P can be removed (removed) by following the procedure described above.

E Ground W Outer Wall P Live Pipe 1 Fixed Pipe 2 Connected Pipe 10 No Blow Bag 20 Bag Body 30 First Blocking Body 60 Second Blocking Body 50 Third Blocking Body

Claims (2)

In a gas pipe comprising a fixed pipe and a connected pipe which is rotatable about its axis and one end of which is threadedly connected to said fixed pipe, attaching and detaching said connected pipe without stopping gas supply. A blowback bag for working,
a tube-shaped bag that covers a connecting portion between the fixed pipe and the connected pipe for performing the attachment/detachment work;
a first sealing body that is pierced by the fixed pipe and adheres to the outer peripheral surface of the fixed pipe;
a second blocking body that is penetrated by the connected pipe and is in close contact with the outer peripheral surface of the connected pipe and capable of rotating the connected pipe about its axis;
a third closure that allows the hands and arms of an operator to be placed inside the bag and is in close contact with the surroundings of the hands and arms;
A working space is formed between the third blocking body and the connecting portion in the inside of the bag body so that a worker can attach and detach the connected pipe by hand,
The second blocking body is composed of a chloroprene rubber sponge or a rubber member whose inner peripheral surface has a reduced friction coefficient by surface treatment ,
A stepped slit is formed in the second blocking body from the upper end to the lower end,
The slits are, in order from top to bottom, an upper slit that is formed straight in the axial direction, a middle slit that is continuous with the upper slit and is formed straight in the direction perpendicular to the axial direction, and a middle slit that is continuous with the middle slit and is formed in the axial direction. a straight lower slit;
The second blocking body has a split structure that can be split open from the slit, and can be attached to the connected pipe from the direction perpendicular to the axis of the connected pipe.
A no-blow bag characterized by: 2. The first sealing member is a rubber body integrally formed with an annular plate portion having an open center and a bell mouth portion protruding from the plate portion to the outside of the bag body. No blow bag.

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