JP2000018479A - Gas cutoff operating no-blow bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the gas from leaking from the insertional part of an arm by installing a through-hole of a rubber ball air supplying hose separately. SOLUTION: In a gas cutoff operating no-blow bag A being composed of covering a lower bottom 3 of a bag body 1 hollowly made up by a transparent soft synthetic resin sheet with a crude rubber plate 5 provided with a mounting hole 5a to a saddle or the like 11 in the center, and likewise covering an upper bottom 2 of the bag body 1 with another crude rubber plate 4 with an insertion hole 4a for inserting the arm, a purging hose 20 is attached to the uppers bottom 2, whereby the purge of gas flowed into the bag body 1 by way of the purging hose 20 is made so as to be performable by a safety method. In addition, two rubber ball air supplying hose through-holes 22 and 23 are installed in the upper bottom 2, whereby the gas is made so as not to leak from the circumference of the arm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a no-blow bag for gas shut-off work, which is used when a new gas pipe is extended from a main pipe of an active pipe (in a gas-passed state).

[0002]

2. Description of the Related Art When extending a new pipe from an existing main pipe, it is necessary to temporarily shut off gas and open the connection point to the atmosphere. Generally, the gas is cut off by piercing an existing main pipe and inflating a rubber ball inserted therefrom. FIGS. 4A and 4B show the configuration of the no-blow bag A used in such construction. The no-blow bag A has a hole 2 having a diameter of about 100 mm at the center of an upper bottom (arm insertion side) 2 and a lower bottom (pipe mounting side) 3.
a, 3a opened, approximately 300mmφ outside diameter x 45 height
A foldable hollow cylindrical bag body 1 made of transparent soft polyvinyl chloride of about 0 mm, and an outer diameter 200 mm on the upper bottom 2
A size that can be fitted (with airtightness) to a raw rubber plate 4 with an inner diameter of 48 mmφ and an outer diameter of 200 mmφ x [inner diameter is saddle or clamp (hereinafter referred to as “saddle, etc.”) at the lower opening 3. The raw rubber plate 5 is attached to the holes 2a and 3a with the centers of the holes 4a and 5a.

[0003] The usage of this no-blow bag A is as follows.
Hole 5a is attached to the outer peripheral groove portion of the branch opening such as a saddle, and the upper bottom 2
The arm is inserted through the hole 4a of the above, and the live tube work in the branch opening such as the saddle is performed. The lower bottom 3 is between the raw rubber plate 5 stuck on the bag body 1 and the outer peripheral groove portion of the branch opening such as the saddle. so,
In addition, the upper bottom 2 is sealed between the raw rubber plate 4 and the arm to be inserted, thereby enabling a live tube operation.

An example of this operation will be described with reference to FIGS. This operation is a procedure for shutting off and opening a gas by a rubber ball using a no-blow bag of an existing main branch pipe, and is specifically as follows.

<Drilling / Plug Stopping> A saddle 11 or the like adapted to the gas pipe diameter is attached to a drilling position of the existing main pipe 10 using a chain or the like 11b (FIG. 5). The drilling adapter 12 is connected to the branch port 11 of the saddle 11 or the like.
a (Fig. 6, Fig. 7). Mounting hole 5a of raw rubber plate on lower bottom 3 of no blow bag A
Is spread and attached to the outer peripheral groove portion of the branch port 11a of the saddle 11 and the like, and the hole 4a of the upper bottom 2 is widened and lowered to below the body of the drilling adapter 12, and then the drilling 10a is formed by using a power tool or the like.
(FIG. 8). Pull up the no-blow bag A to the maximum position. The perforating adapter 12 is housed in the no-blow bag A (FIG. 9). The plug 15 coated with the sealing agent is put into the no-blow bag A from the hole 4a in the upper bottom 2 of the no-blow bag A (FIG. 10). After inserting the arm from the hole 4a of the upper bottom 2 of the no-blowing bag A, the perforating adapter 12 is removed, and the plug 15 inserted in advance is attached to the perforating hole 10a to close the perforating hole 10a (FIG. 11). . At this time, the main branch 1
The gas leaked from the zero blow bag A is filled in the no blow bag A, but the hole 5a in the lower bottom 3 of the no blow bag A is
1 and the hole 4a of the upper bottom 2 are tightly sealed to the inserted arm.
It does not leak to the periphery (FIG. 18). The arm is pulled out and the perforating adapter 12 is taken out of the no-blowing bag A, and at the same time, the accumulated gas in the no-blowing bag A is diffused from the hole 4a of the upper bottom 2 and the inside is replaced with air.

<Gas Blocking by Rubber Ball> Two rubber balls in a deflated state (main ball 13 and inverted ball 14) are put into no-blow bag A. At this time, rubber ball 1
Hose for sending air to 3 and 14 (air supply hose) 13
a and 14a are drawn to the atmosphere side from the hole 4a of the upper bottom 2 of the no-blow bag A (FIG. 12). The arm is inserted through the hole 4a in the upper bottom 2 of the no-blow bag A, and the plug 15 is gradually removed (FIGS. 13 and 14).
At this time, the air supply hoses 13a, 1
4a, the arm and the air supply hose 13a, 1
It is inevitable that a small amount of gas leaks to the vicinity of the no-blow bag A from the gap with the nozzle 4a (FIG. 19). The main ball 13 is inserted from the perforated hole 10a from which the plug 15 has been removed, and air of a specified pressure is sealed from the air supply hose 13a and expanded. Next, the reverse ball 14 is inserted in the same procedure, and air of a specified pressure is sealed and inflated. This shuts off the gas (FIG. 14). The accumulated gas in the no-blow bag A is diffused and replaced with air.

<Opening of Gas> Plug 15 coated with a sealant is inserted into no-blow bag A
(Fig. 14). With the arm inserted through the hole 4a of the upper base 2 of the no-blow bag A, the air of the main ball 13 is gradually released, and the main ball 13 is pulled out from the perforated hole 10a in a completely deflated state. At this time, the hole 10
After the gas leaked from a is filled in the no-blowing bag A, the gas leaks slightly around the no-blowing bag A from the gap between the arm of the hole 4a of the upper bottom 2 of the no-blowing bag A and the gas ball air supply hoses 13a and 14a. (FIGS. 15 and 19). Similarly, the air of the inverted ball 14 is gradually extracted, and is extracted from the perforated hole 10a in a completely deflated state. The perforated hole 10a is closed with the plug 15 prepared in advance in the no-blow bag A (FIG. 16). The rubber ball (main ball 13 and inverted ball 14) extracted from the perforated hole 10a is taken out from the no-blow bag A. The no-blow bag A is removed from the saddle or the like 11 (FIG. 17). The saddle 11 is removed from the existing main branch pipe 10.

[0008]

However, the use of the conventional no-blow bag A has the following disadvantages. In the <perforation / plug stop> step, when the perforation hole 10a is opened, pressure is applied to the no-blow bag A due to gas leaking from the perforation hole 10a, so that the seal portion needs to have a structure that can withstand the pressure. . In the <gas block by rubber ball> and <gas opening> processes, when the perforated hole 10a is opened, the arm of the hole 4a of the upper bottom 2 of the no-blow bag A and the rubber ball air supply hose 13a, 1
Gas leaks into the atmosphere from the gap 4a. When the rubber ball is inserted, the rubber ball air supply hoses 13a and 14a come into contact with the arm, so that the operation is difficult. Since abnormal deformation is applied to the hole 4a of the upper bottom 2 of the no-blow bag A, the hole 4a of the raw rubber plate 4 is easily damaged. An object of the present invention is to provide a no-blow bag that does not have the above-mentioned problems.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a no-blow bag for gas shut-off operation, wherein the bag body is formed of a transparent soft synthetic resin sheet in a hollow shape. A gas blocking operation in which the lower bottom hole is covered with a raw rubber plate provided with a mounting hole for a saddle or the like at the center, and the upper bottom hole of the bag body is further covered with a raw rubber plate having an insertion hole for inserting an arm. In the no-blowing bag, a purge hose is attached to the upper bottom, and the gas flowing into the bag via the purge hose is purged.

Further, in the invention according to claim 2,
The invention according to claim 1 is characterized in that a closing means is attached to the purge hose.

Further, in the invention according to claim 3,
According to a second aspect of the present invention, the closing means comprises a clip.

Further, in the invention according to claim 4,
The invention according to claim 2 is characterized in that the closing means comprises a quick coupling plug with a built-in valve.

Further, in the invention according to claim 5,
The invention according to claim 1 or 2, wherein a rubber ball air supply hose through hole is provided in the upper bottom.

Further, in the invention according to claim 6,
The invention according to claim 5 is characterized in that two rubber gas supply hose through holes are provided in the upper bottom.

Further, in the invention according to claim 7,
In the invention according to claim 5 or 6, the diameter of the rubber ball air supply hose through hole is set slightly smaller than the outer diameter of the air supply hose.

Further, in the invention according to claim 8,
In the invention according to claim 5, 6, or 7, the rubber ball air supply hose through hole has a means for closing when the rubber ball is not used.

Further, in the invention according to claim 9,
The invention according to claim 8 is characterized in that the closing means comprises a rubber stopper.

Further, according to the invention described in claim 10, in the invention described in claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9, the raw rubber plate constituting the upper bottom and the lower bottom Is characterized in that, in order to improve strength while maintaining flexibility, a plurality of sheets are laminated and only the outer peripheral portion is connected.

Further, the invention according to claim 11 is characterized in that, in the invention according to claim 10, the number of layers is two.

[0020]

The no-blow bag is attached to the main pipe by attaching a lower mounting hole to an outer peripheral groove of a branch port of a saddle or the like, and inserting an arm through the upper bottom hole to perform various operations. At this time, the gas from the main pipe is dissipated using the purge hose attached to the no-blow bag, thereby preventing leakage from the upper bottom hole in which the arm is inserted. When a rubber ball is used, the rubber stopper closing the rubber ball air supply hose through hole is removed, and the hose is extended out of the bag and connected to a pump or the like.

[0021]

This embodiment corresponds to the first to eleventh aspects of the present invention, and its detailed structure is shown in FIGS.
1 to 3, the no-blow bag A has holes 2a and 3a each having a diameter of about 100 mm in the center of an upper base (arm insertion side) 2 and a lower base (pipe mounting side) 3, each having an approximately outer diameter. A foldable hollow cylindrical bag body 1 made of transparent soft polyvinyl chloride having a size of about 300 mmφ x about 450 mm
The upper bottom 2 is provided with a raw rubber plate 4 having an outer diameter of 200 mmφ × the inner diameter of 48 mmφ, and the lower bottom 3 is provided with an outer diameter of 200 mmφ × [having an inner diameter which can be attached (with airtightness) to the outer peripheral groove portion of a branch port such as a saddle. The raw rubber plate 5, which has been
In this configuration, the centers of the holes 4a and 5a are aligned with the holes 3a and 3a. The shape of the no-blow bag A used in the present invention is arbitrary.

Reference numeral 20 denotes a purging hose attached to the raw rubber plate 4 on the upper bottom 2. The purging hose 20 can be opened or closed by a clip or a quick coupling plug 21. Reference numerals 22 and 23 denote hose through holes for feeding rubber balls. The hoses 13a and 14a connected to the rubber balls 13 and 14 are connected to the pump via the through holes 22 and 23. The diameter of the through holes 22 and 23 is
The hoses 13a and 14a are formed slightly smaller in outer diameter than the hoses 13a and 14a. The hoses 13a and 14a can be freely moved in and out, but are tightly adhered so that the gas does not leak outside. In addition, rubber hoses 24 and 25 are attached to the through holes 22 and 23 when the hose does not pass through.

FIG. 3 shows the structure of the raw rubber plates 4 and 5, and the raw rubber plates 4 and 5 are bonded to each other around two rubber plates so as to maintain strength while maintaining flexibility. It is devised.

Next, a procedure for shutting off and opening a gas by a rubber ball using the no-blow bag will be described. However, since the procedure is the same as the conventional example, description will be made using the conventional construction example shown in FIGS. <Drilling / Plug-off> A saddle 11 or the like suitable for the gas pipe diameter is attached to a drilling position of the existing main pipe 10 using a chain 11b or the like (FIG. 5). The drilling adapter 12 is connected to the branch port 11 of the saddle 11 or the like.
a (Fig. 6, Fig. 7). Mounting hole 5a of raw rubber plate on lower bottom 3 of no blow bag A
Is spread and attached to the outer peripheral groove portion of the branch port 11a of the saddle 11 and the like, and the hole 4a of the upper bottom 2 is widened and lowered to below the body of the drilling adapter 12, and then the drilling 10a is formed by using a power tool or the like.
(FIG. 8). The tip of the purge hose 20 attached to the upper bottom 2 of the no-blow bag A is clipped or the like, and the rubber ball air supply hose through holes 22, 23 are shown in FIG.
They are closed by rubber stoppers 24 and 25 shown in FIG. The no-blow bag A is pulled up to the maximum position, and connected to a diffusion device (not shown) provided with a purge hose 20 separately.
The perforating adapter 12 is housed in the no-blow bag A (FIG. 9). The plug 15 to which the sealing agent has been applied is put into the no-blow bag A from the hole 4a in the upper bottom 2 of the no-blow bag A (FIG. 10). After inserting the arm from the hole 4a in the upper bottom 2 of the no-blow bag A, the perforating adapter 12 is removed, the plug 15 previously inserted is attached to the perforating hole 10a, and the perforating hole 10a is closed (FIG. 11). . During this work, the gas leaked from the main pipe 10 once fills the no-blowing bag A, but is guided from the purging hose 20 on the upper bottom 2 of the no-blowing bag A to a diffusion device (not shown), thereby causing no-blowing. There is no leakage around the bag A. The arm is pulled out, the perforating adapter 12 is taken out of the no-blow bag A, and at the same time, the accumulated gas in the no-blow bag A is diffused and the inside is replaced with air.

<Glass Blocking by Rubber Ball> Two rubber balls (main ball 13 and inverted ball 14) in a deflated state are put in the no-blow bag A. At this time, the rubber ball air supply hoses 13a and 14a are connected to the upper bottom 2 of the no-blow bag A.
From the rubber ball air supply hose through holes 22 and 23 (rubber stopper 2
Pulled out to the atmosphere side (with 4 and 25 removed) (Fig. 1
2). The arm is inserted through the hole 4a in the upper bottom 2 of the no-blow bag A, and the plug 15 is gradually removed (FIGS. 13 and 14).
At this time, the hole 4a of the upper bottom 2 is tightly sealed to the arm, and the purge hose 20 is connected to a diffusion device (not shown), so that gas leaked from the hole 10a leaks out around the no-blow bag A. Never. (See FIG. 2). The main ball 13 is inserted from the perforated hole 10a from which the plug 15 has been removed, and air of a specified pressure is sealed from the air supply hose 13a and expanded. Next, the reverse ball 14 is inserted in the same procedure, and air of a specified pressure is sealed and inflated. This shuts off the gas (FIG. 14). The accumulated gas in the no-blow bag A is diffused and replaced with air.

<Opening of Gas> The plug 15 coated with the sealing agent is
(Fig. 14). With the arm inserted through the hole 4a of the upper base 2 of the no-blow bag A, the air of the main ball 13 is gradually released, and the main ball 13 is pulled out from the perforated hole 10a in a completely deflated state. At this time, the hole 10
Although the gas leaked from a is once filled in the no-blowing bag A, it is sent to the diffusion device via the purge hose 20 provided on the upper bottom 2 of the no-blowing bag A, so that the gas leaks out around the no-blowing bag A. There is no. Similarly, the air of the inverted ball 14 is gradually extracted, and is extracted from the perforated hole 10a in a completely deflated state (FIG. 2). The perforated hole 10a is closed with the plug 15 prepared in advance in the no-blow bag A (FIG. 16). The rubber balls (the main ball 13 and the inverted ball 14) extracted from the perforated hole 10a are drawn out from the hole 4a of the upper bottom 2 of the no-blowing bag A after the air supply hoses 13a and 14a are once pulled back into the no-blowing bag A. . The no-blow bag A is removed from the saddle or the like 11 (FIG. 17). The saddle 11 is removed from the existing main branch pipe 10.

[0027]

The present invention is constituted as described above and has the following effects. 1. Since the purge hose is provided on the upper bottom of the no-blow bag, the seal is ensured. 2. By providing a purge hose and a rubber ball air supply hose through hole at the upper bottom of the no-blow bag, gas leakage around the no-blow bag during operation is eliminated. 3. During the operation, there are no obstacles in contact with the arm, and the workability is improved. 4. Since the strength of the raw rubber portion is increased and abnormal deformation is eliminated, breakage can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a no-blow bag according to the present invention.

FIG. 2 is an explanatory diagram of a use state.

FIG. 3 is an explanatory view of a raw rubber plate.

FIG. 4 is an explanatory view of a conventional no-blow bag.

FIG. 5 is an explanatory diagram of a gas shutoff and opening procedure.

FIG. 6 is an explanatory diagram of a gas shutoff and opening procedure.

FIG. 7 is an explanatory diagram of a gas shutoff and opening procedure.

FIG. 8 is an explanatory diagram of a procedure for shutting off and opening a gas.

FIG. 9 is an explanatory diagram of a gas shutoff and opening procedure.

FIG. 10 is an explanatory diagram of a gas shut-off and opening procedure.

FIG. 11 is an explanatory diagram of a gas shut-off and opening procedure.

FIG. 12 is an explanatory diagram of a gas shutoff and opening procedure.

FIG. 13 is an explanatory diagram of a gas shutoff and opening procedure.

FIG. 14 is an explanatory diagram of a gas shut-off and opening procedure.

FIG. 15 is an explanatory diagram of a gas shutoff and opening procedure.

FIG. 16 is an explanatory diagram of a gas shut-off and opening procedure.

FIG. 17 is an explanatory diagram of a gas shut-off and opening procedure.

FIG. 18 is an explanatory view of a use state of a conventional no-blow bag.

FIG. 19 is an explanatory diagram of a use state of a conventional no-blow bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas bag main body 2 Upper bottom 3 Lower bottom 4 Raw rubber plate 4a hole 5 Raw rubber plate 5a hole 10 Existing main branch pipe 10a Drilled hole 11 Saddle, etc. 11a Branch part 12 Drilling adapter 13 Main ball 13a Air supply hose 14 Reverse ball 14a Air supply Hose 15 Plug 20 Purge hose 21 Quick fitting plug 22, 23 Rubber ball air supply hose through hole 24, 25 Rubber stopper A No blow bag

Claims (11)

[Claims] 1. A hole in a lower bottom of a bag body formed of a transparent soft synthetic resin sheet in a hollow shape is covered with a raw rubber plate provided with a mounting hole for a saddle or a clamp at a center. In a no-blow bag for gas blocking operation, wherein the hole is covered with a raw rubber plate having an insertion hole for inserting an arm, a purge hose is attached to the upper bottom,
A no-blowing bag for a gas shutoff operation, wherein the gas flowing into the bag via the purging hose is purged. 2. The no-blow bag according to claim 1, wherein a closing means is attached to the purge hose. 3. The no-blow bag according to claim 2, wherein the closing means comprises a clip. 4. The no-blow bag according to claim 2, wherein the closing means comprises a quick-connecting plug with a built-in valve. 5. The no-blow bag for gas shut-off work according to claim 1, wherein a rubber ball air supply hose through hole is provided in an upper bottom. 6. The no-blow bag for gas shut-off work according to claim 5, wherein two through-holes for a rubber ball air supply hose are provided at an upper bottom. 7. The no-blow bag for gas shutoff work according to claim 5, wherein the diameter of the rubber ball air supply hose through hole is set slightly smaller than the outer diameter of the air supply hose. 8. The rubber ball air supply hose through hole has a means for closing when the rubber ball is not used.
Or a no-blow bag for gas shut-off work according to 7. 9. The means for closing comprises a rubber stopper.
The no-blow bag for gas shut-off work described in the above. 10. A raw rubber plate constituting an upper bottom and a lower bottom,
A plurality of sheets are laminated and only an outer peripheral portion is connected to improve strength while maintaining flexibility, wherein the outer peripheral part is connected. The no-blow bag for gas shut-off work described in the above. 11. The no-blow bag according to claim 10, wherein the number of laminations is two.