JP4478256B2 - Pipe line blocking bag and pipe line blocking method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a pipe blocking bag and a pipe blocking method for blocking gas using a gas bag at the time of pipe work involving welding work such as pipe replacement.
[0002]
[Prior art]
Gas pipe work such as pipe replacement work and branching work due to the aging of gas pipes due to laying for many years is frequently performed.
When performing such a gas pipeline construction, the construction is usually performed by shutting off the gas only in the construction section, for example, a shut-off method as shown in FIG.
As shown in FIG. 4, a work pit is formed by excavating the periphery of the repair section. Next, the bag introduction holes a and b are drilled on the upstream side and the downstream side of the repair section, and the main bag c is contracted from the bag introduction holes a and b, and enters the pipeline toward the opposite side of the repair section. Introduce and inflate.
Next, in a state where the reverse ball bag d is contracted from the bag introduction holes a and b, it is introduced into the pipeline toward the repair section side and inflated. This reverse ball bag d shuts off the excess gas in the main ball bag c.
[0003]
Further, introduction holes e and f are drilled on the repair section side from the bag introduction holes a and b. Then, a bedden stopper g folded from the introduction holes e and f is introduced into the pipe and is expanded in the pipe.
This beden stopper g is a member that receives a spark generated by welding or the like in the repair section, and is made of leather, and prevents ignition of the gas by the spark. be able to.
Further, a nitrogen replacement hose h is introduced into the pipe through the introduction holes e and f, and the gas staying in the repair section is replaced with nitrogen gas as an inert gas.
[0004]
[Problems to be solved by the invention]
By the way, in the case of the blocking method described above, the introduction holes e and f must be provided in the pipeline in addition to the bag introduction holes a and b. Therefore, it is inevitably necessary to secure a wide work area, and the work pit must be greatly cut. Therefore, the problem that the working time required for excavation and backfilling is prolonged and the cost thereof is high is derived.
In addition, since a plurality of introduction holes are drilled, there arises a problem that the working time required for drilling and restoration is prolonged and the cost thereof is increased.
[0005]
The present invention has been proposed in order to cope with such a situation, and when repairing a gas pipeline , the pipeline blocking bag capable of reducing the work time and reducing the cost , and this An object of the present invention is to provide a pipeline blocking method using a pipeline blocking bag .
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the upstream side of the repaired portion of the pipe is used to block the gas flow when repairing the existing pipe line through which the gas flows. A gas bag made of a sheet material that is introduced into the pipe line from the bag inlet port perforated on the downstream side and that can be inflated and shrunk by supplying inflation air; and the gas bag is disposed in the pipe line When the tube is inflated, a pipe blocking bag having a substantially rectangular cross-sectional shape in the laying direction of the pipe, wherein the pipe blocking bag is at least on the repair site side of the gas bag made of the sheet material. A non-combustible member is overlapped over the entire exposed portion, and a space that can be inflated independently of the gas bag is provided between the gas bag and the non-combustible member, and the gas bag is disposed in the pipe line. When introduced to An end opening portion passes through one of the side surfaces of the gas bag facing the pipe laying direction and communicates with the inside of the gas bag to supply the inflation air to the gas bag. And an air passage.
[0007]
According to a second aspect of the present invention, the space portion is formed on a side surface of the gas bag when the gas bag is inflated in the conduit, and the space portion is disposed on a side surface of the gas bag when the gas bag is inflated in the conduit. Of these, it is characterized in that it is formed on the side surface adjacent to the repaired portion of the conduit .
[0008]
According to a third aspect of the present invention, the air passage is composed of a double pipe having a gas passage inserted therein, and the one end opening side of the gas passage is at the time of expansion of the gas bag in the pipe passage. A side surface of the gas bag that faces the laying direction of the pipe line, passes through a side surface through which the air passage does not pass, and communicates with the inside of the pipe line. It is characterized in that it is such as to communicate with the inert gas supply source.
[0009]
The invention according to claim 4 is configured such that the air passage is a double pipe having a gas passage inserted therein,
The one end opening side of the gas passage is a side surface that faces the laying direction of the pipeline of the gas bag when the gas bag is inflated in the pipeline, and the side surface through which the air passage does not penetrate And communicates with the inside of the pipe line and communicates with the space portion ,
The other end opening side of the gas passage is communicated with an inert gas supply source.
[0010]
According to the fifth aspect of the present invention, when repairing an existing pipe line through which gas is circulating, it is introduced into the pipe line from a bag inlet port drilled in the upstream side and the downstream side from the repaired portion of the pipe line. And a non-combustible member is overlapped at least over the entire portion of the gas bag made of an inflatable / shrinkable sheet material exposed to the repair location side, and is independent of the gas bag between the gas bag and the non-combustible member. A space that can be inflated, and when inflated in the pipe, the cross-sectional shape of the pipe in the laying direction is substantially rectangular, and faces the pipe laying direction of the gas bag The main bag having an air passage for supplying inflation gas to the gas bag facing the gas bag from one side surface, and introduced into the pipeline from the bag introduction port, Inflatable / shrinkable sheet material A space that can be inflated independently of the gas bag between the gas bag and the non-combustible member, with a non-combustible member superimposed on at least the entire portion of the gas bag that is exposed to the repair location side. And when expanded in the pipe, the cross-sectional shape of the pipe in the laying direction is substantially rectangular, and the gas bag has a cross-sectional shape from one side surface facing the pipe laying direction. And an air passage for supplying inflation gas to the gas bag, and a side surface that is inserted into the air passage and faces the laying direction of the pipeline of the gas bag from the inside of the gas bag. The gas flow in the pipe line is circulated using a reverse ball bag having a gas passage communicating with the outside of the gas bag with one end opening projecting from a side surface through which the air passage does not penetrate. Tube to shut off In the blocking method, the main ball bag is introduced from each bag introduction port into a position facing the repaired portion of the conduit, and the main bag is introduced from the air passage of the main ball bag. After supplying the inflation air into the main ball bag and inflating the main ball bag, from one of the bag introduction ports, the one end opening of the gas passage is connected to the repaired portion of the pipeline. From the air passage of the reverse ball bag so as to be oriented in the direction of the pipe and introduced into the pipeline so as to be disposed at the front position of the main ball bag with respect to the repair point of the pipeline. The inflation air is supplied into the reverse ball bag to inflate the reverse ball bag, and then an inert gas is supplied to the gas passage provided in the reverse ball bag to supply the gas. An inert gas from one end opening of the passage to the repair location side of the conduit And ejecting and replacing said inert gas of the gas staying in the repair position, and performs repair of the repair locations.
[0014]
[Function and effect]
According to the first to fifth aspects of the present invention, the gas bag made of the inflatable / shrinkable sheet material introduced into the pipe line has at least a portion exposed to the repair location side with a space portion in the sheet material. because it is a structure obtained by superposing incombustible member is provided, if a spark occurs by welding or the like at the time of repair work of the pipeline, even if this spark is leap into the gas bag, the sheet material in this sparks The gas bag made of is never damaged.
As a result, since the conduit blocking bag of the present invention can be used for both gas blocking and spark receiver, there is no need to newly provide a spark receiver introduction hole in the repair pipe, such as drilling and recovery. in addition it is possible to shorten the working time, when the conduit is buried pipe, it is possible to reduce the work tank, a significant shortening of the working time, and the al can significantly reduce operating costs.
[0015]
Furthermore, the pipe line blocking bag according to the present invention provides a space between a gas bag made of an inflatable / shrinkable sheet material and a non-combustible member, and superimposes the sheet material and the non-combustible member. Forming.
Therefore, the conduit blocking bag has a double structure, inflatable air is supplied into the inflatable sheet material, and an inert gas is supplied into the space.
As a result, even if the non-combustible member is damaged, the inert gas flows out, so that ignition by sparks can be prevented.
In addition, when the structure is such that the inert gas is ejected from the one-end opening side of the gas passage toward the repair section, the gas staying in the repair section can be replaced with the inert gas, and the safety of the repair work is improved. improves.
[0018]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 (a) shows an embodiment of a reverse line gas bag (hereinafter referred to as "reverse ball bag" ) that is a pipe line blocking bag according to the present invention and is disposed on the repaired portion side of the pipe line. An external side view and the same figure (b) are sectional drawings.
As shown in FIG. 1 , the inverted ball bag 1 is formed by overlapping a non-combustible member 12 on a part of a gas bag 11 formed of, for example, a rubber-based member that can be expanded and contracted . And in the example shown in FIG. 1, when the gas bag 11 expand | swells in a pipe line, it is set as the structure which accumulated the nonflammable member 12 on the whole region exposed to the repair location side at least. That is, in FIG. 1, the non-combustible member 12 is disposed so as to cover the rear stage (substantially half from the lower side of FIG. 1 toward the upper side) of the gas bag 11. A nonflammable member is formed in the gas bag 11 so as to form a space 13 as shown in FIG. 1B between the rear side surface (the side surface located below the paper surface in FIG. 1) and the nonflammable member 12. 12 are superimposed.
[0019]
Here, the nonflammable member 12 is formed of a fiber having heat resistance and wear resistance . An example of such a fiber is , for example, PBO fiber (developed by Toyobo Co., Ltd.). This PBO fiber is formed by reacting diaminoresorcinol and terephthalic acid using polyphosphoric acid as a solvent, and polymerizing polyparaphenylenebenzbisoxazole (PBO).
And this PBO fiber is rich in strength, elastic modulus, heat resistance and flame resistance compared with conventional fibers in various experiments. Rubber reinforcement materials, FRP and reinforcing fibers for concrete, high temperature heat resistant felt, fire fighting It is used for various purposes such as clothes and heat-resistant work clothes.
For this reason, even if a spark is ignited on this PBO fiber, the PBO fiber is not burned or damaged. Further, since it is rich in strength and elastic modulus, without heat damage with some friction, also, it is not also damaged as caught on uneven portion such as a burr that will be formed during the drilling.
[0020]
Further, an air passage 14 for inflating and shrinking the gas bag 11 is inserted into the inside of the reverse ball bag 1, one end opening faces the inside of the gas bag 11 , and the other end opening is illustrated. Do not communicate with the air pump.
And, the wherein the air passage 14, Ri Contact is inserted a gas passage 15 having one end opening protrudes from the tip portion of the opposite ball bag 1, an inert gas cylinder, such as nitrogen gas other end opening (not shown) It is communicated to. Further, the gas passage 15 is formed with a jet port 15 a for jetting an inert gas in the space portion 13.
Here, it goes without saying that the contact portions between the passages 14 and 15 and the gas bag 11 are properly sealed.
[0021]
Due to such a configuration, as a first advantage, the gas bag 11 and the space portion 13 are inflated by independent gas supply sources. Therefore, even if the space portion 13 is damaged or contracted unfortunately, the gas bag 11 and the space portion 13 are inflated. Since the bag 11 maintains the expansion, the gas can be properly blocked in the pipeline. Further, when the space portion 13 is damaged or contracted, the inert gas flows out, so that the gas bag 11 is protected from ignition without being ignited by a spark or the like. Furthermore, because of the structure that can supply the inert gas from the tip of the gas passage 15 to the repair site side, the city gas staying at the repair site can be replaced with the inert gas after shutting off by the bag. Improvements can be made.
As a second advantage, since the gas passage 15 is inserted into the air passage 14, the gas passage 15 can be a single passage in appearance, and the bag introduction / removal work from the small perforation hole into the conduit is complicated. Is eliminated and workability is improved.
[0022]
FIG. 2 (a) is a conduit blocking bag according to the present invention, the position behind the reverse ball bag 1 introduced so as to face the repair location in the conduit, that is, the repair in the conduit. external side view of the ball bag to be introduced into the rear side of the opposite ball bag 1 to sections, FIG. (b) is a sectional view thereof.
As shown in FIG. 2 , the main bag 2 is formed by superimposing a nonflammable member 12 on a gas bag 21 that can be expanded and contracted . In the example shown in FIG. 2, the non-combustible member 12 covers the front side of substantially half of the gas bag 21, i.e., the front side of substantially half of the gas bag 21 (substantially half from the lower side of FIG. 2 toward the upper side) . It is arranged like this.
Further, the main bag 2 is provided with an air passage 22 having one end opening facing the main ball bag 2 and the other end communicating with an air pump (not shown).
[0023]
In the following, with conduit blocking bag of the present invention described above, an example of a conduit shutoff method according to the present invention will be described with reference to FIG.
As shown in FIG. 3 , a relatively small work pit P is excavated around the repaired portion X with respect to the existing existing pipeline 3.
And the bag introduction ports 31 and 32 are drilled in the upstream and downstream of the repair location X. Next, to expand the upstream side and the ball bag 2 toward the downstream side with respect to the repair position X of each channel 3 from the bag inlet 31 and 32 is introduced into the pipe 3, followed by similarly The bag 1 for reverse balls is introduced into the conduit 3 from the bag inlets 31 and 32 and inflated.
Next, the inert gas is injected from the gas passage 15 to the repair location X, and the city gas staying at the repair location X is replaced with the inert gas.
[0024]
After the above work is completed, construction work such as cutting and welding of the existing pipeline 3 is performed.
In this case, even a spark due to the work occurs, for receiving the spark nonflammable member 12 made of non-flammable fibers disposed on the opposite ball bag 1, ignition or reverse ball bag 1 by sparks Damage can be prevented. In addition, even if the reverse ball bag 1 is damaged or contracted for some reason, the nonflammable member 12 disposed in the main ball bag 2 can receive a spark, thereby preventing gas ignition by the spark. be able to.
[0025]
And, after repair work is completed, remove the bag from the pipe 3 by the respective bags 1, 2 to contract, the bag inlet 31 and 32 to recover and stop plugs, complete the repair work backfilled working pit P Let
[0026]
As described above, since the bag device of the present invention can be used for both gas shut-off and spark receiving, the perforation port can be limited to the bag introduction ports 31 and 32 as compared with the conventional construction method. The cutting area can be significantly reduced. Therefore, shortening of working time and reduction of working cost can be realized.
Furthermore, the drilling / restoring work in the buried pipe can also reduce the work time and the work cost.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an inverted ball bag of the present invention.
FIG. 2 is an explanatory diagram of a genuine ball bag according to the present invention.
FIG. 3 is an explanatory diagram of a blocking method according to the present invention.
FIG. 4 is an explanatory diagram of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reverse bag 11 Gas bag 12 Nonflammable fiber 13 Space part 14 Air passage 15 Gas passage 15a Spout 2 Main ball bag 21 Gas bag 22 Air passage 3 Existing pipe line 31 Bag introduction port 32 Bag introduction port

Claims (5)

In order to shut off the gas flow when repairing an existing pipe line through which gas is flowing, it is introduced into the pipe line from a bag introduction port drilled in the upstream side and the downstream side from the repair point of the pipe line A gas bag made of a sheet material that can be inflated and contracted by supplying inflation air, and when the gas bag is inflated in the pipeline, the cross-sectional shape in the laying direction of the pipeline is substantially rectangular A conduit blocking bag,
The conduit blocking bag is:
A non-combustible member is overlaid at least on the entire portion of the gas bag made of the sheet material exposed to the repair location side, and the gas bag is inflated independently of the gas bag between the gas bag and the non-combustible member. A space that can be
When the gas bag is introduced into the pipe line, one end opening side is communicated with the gas bag through one side face of the gas bag facing the laying direction of the pipe line. An air passage for supplying the inflation air to the gas bag.   The said space part is formed in the side of the side surface adjacent to the repair location of the said pipe line among the side surfaces of the said gas bag at the time of the said gas bag being expanded in the said pipe line. A line blocking bag according to claim 1. The air passage is composed of a double pipe having a gas passage inserted therein,
The one end opening side of the gas passage is a side surface that faces the laying direction of the pipeline of the gas bag when the gas bag is inflated in the pipeline, and the side surface through which the air passage does not penetrate And communicates with the inside of the pipe line,
2. The conduit blocking bag according to claim 1, wherein the other end opening side of the gas passage is communicated with an inert gas supply source. The air passage is composed of a double pipe having a gas passage inserted therein,
The one end opening side of the gas passage is a side surface that faces the laying direction of the pipeline of the gas bag when the gas bag is inflated in the pipeline, and the side surface through which the air passage does not penetrate And communicates with the inside of the pipe line and communicates with the space portion,
2. The conduit blocking bag according to claim 1, wherein the other end opening side of the gas passage is communicated with an inert gas supply source. When repairing an existing pipe line through which gas is circulated, a sheet that is introduced into the pipe line from a bag introduction port perforated on the upstream side and the downstream side from the repaired part of the pipe line, and is expandable / shrinkable A space in which a non-combustible member is overlaid at least on the entire portion of the gas bag made of a material that is exposed to the repair site, and can be inflated independently of the gas bag between the gas bag and the non-combustible member. Part
When inflated in the pipeline, the cross-sectional shape in the laying direction of the pipeline is substantially rectangular, and faces the gas bag from one side surface of the gas bag facing the laying direction of the pipeline. A main bag having an air passage for supplying inflation gas to the gas bag;
Similarly, a non-combustible member is overlapped over the entire region exposed to at least the repair location side of the gas bag made of an inflatable / shrinkable sheet material introduced into the conduit from the bag introduction port , and the gas bag and the A space that can be inflated independently of the gas bag between the non-combustible member ,
When inflated in the pipeline, the cross-sectional shape in the laying direction of the pipeline is substantially rectangular, and faces the gas bag from one side surface of the gas bag facing the laying direction of the pipeline. An air passage for supplying inflation air to the gas bag; and a side surface that is inserted into the air passage and faces the laying direction of the pipe line of the gas bag from the inside of the gas bag, A reverse ball bag having a gas passage communicating with the outside of the gas bag with one end opening projecting from a side surface through which the air passage does not penetrate, Road blocking method,
The inflating air is introduced into the main bag from the air passage of the main bag by introducing the main bag from the bag introduction port into a position facing the repaired portion of the conduit. And inflating the genuine bag,
From each of the bag introduction ports, the reverse ball bag is used for the main ball so that one end opening of the gas passage is directed toward the repaired portion of the conduit and the repaired portion of the conduit. It is introduced into the pipe line so as to be disposed at the front position of the bag, and the inflation air is supplied from the air passage of the reverse ball bag into the reverse ball bag. Inflated,
Subsequently, an inert gas is supplied to the gas passage provided in the bag for reverse balls, and the inert gas is ejected from one end opening of the gas passage to the repair portion side of the pipe, so that the repair is performed. A pipeline blocking method characterized in that a gas staying at a place is replaced with the inert gas to repair the repaired place.

Images