JPH0325507Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a pipe closure device that is advantageously used to measure the pressure inside a transportation pipe that transports gas such as city gas prior to construction work.

BACKGROUND ART The pressure in the transportation pipes that transport city gas must be maintained even during construction. Conventionally, before construction, a total of at least three operation holes were formed on both sides of the construction site to confirm whether the gas flow in the transport pipe was one-sided or two-sided supply. Pressure gauges are connected to both ends, and the bag is inserted into the transport pipe through another operation hole to observe changes in pressure values.

Such a typical prior art involves inserting the end of a tube 71 into a bag 70, as shown in FIG. 13, and inserting the end of the tube 71 into a bag 70, as shown in FIG. It is wound around the tube body 71 and maintained in a wound state by an O-ring 72, and then inserted into the tube. Compressed air from an air pump is sent into the tube body 71, and then the end of the tube body 71 is It is fed into the bag body 70 through a through hole 73 formed in the section to inflate the bag body 70, and the air inside the bag body 70 is sucked by an air pump to shrink the bag body 70. It is designed so that it can be taken out of the tube.

In such prior art, when compressed air is sent into the bag body 70, the O-ring 72 comes off and the bag body 70 suddenly expands, which completely blocks the flow of gas in the transport pipe. be. Furthermore, when pulling out the bag 70, it is necessary to use an air pump to create a negative pressure inside the bag 70. If the bag 70 is pulled out without releasing the air, the bag 70 may get caught on the perforated part of the metal pipe, and the bag 70 may be scratched or damaged. Also, bag body 7
When there is residual air inside the bag 70, if you try to wrap the bag body 70 around the tube body 71 by rotating the tube body 71 around its axis, the air that is formed in the tube body 71 inside the bag body 70 will be removed. The through hole 73 is closed by the bag 70, and the bag 70 remains slightly inflated due to residual air, making it difficult to pull it out of the tube.

In another prior art, as shown in FIG. 14, a bag 61 is attached to the end of a flexible tube 60, and when the bag 61 is contracted, it can be broken toward the outer circumferential side of the bag. It is configured to wrap a paper tape 62 around it.

Such prior art has a problem in that when compressed air is supplied into the bag 61, the paper tape 62 breaks and the bag 61 suddenly expands. Further, when the bag 61 is pulled out, it is likely to get caught, as in the prior art, and the bag 61 may be damaged or damaged.

Problems to be solved by the invention The purpose of the invention is to solve the above-mentioned technical problems,
To provide a pipe closure with a simple structure, which allows a bag to be inserted into and pulled out of a transport pipe, and enables reliable pressure measurement of the transport pipe.

Means for Solving the Problems The present invention provides a flexible bag body 30 that includes:
In a state where compressed air is not supplied into the bag body 30, the bag body 30 is flat and its plane is a right angled quadrilateral; and a pair of mutually opposing side portions of the bag body 30. A pair of flexible tube bodies 3 each having one end inserted into the bag body 30 along the line and fixed to the bag body 30.
2, 33, in which the one end of each tube 32, 33 is formed with a through hole 66 on opposing surfaces within the bag 30; and pipe joints 51 and 52 that removably connect the other ends of the tube bodies 32 and 33 extending outward of the bag body 30 to the air pump 53, respectively. It is a closure.

Effect According to the present invention, the bag body 30 is wrapped around the pipe bodies 32, 33 with the pipe bodies 32, 33 and the air pump 53 removed through the pipe joints 51, 52, and such wrapping is performed. Then, the tube bodies 32 and 33 are rotated to expand the bag body 30, and then the pipe joints 51 and 52 are connected to the air pump 53, and the tube body 32, Air is forced into the bag 30 through the bag 33 to inflate the bag 30 and close the transport pipe.

In order to escape the bag 30 from inside the transportation pipe, remove the pipe bodies 32 and 33 and the air pump 53 using the pipe joints 51 and 52, and rotate one of the pipe bodies 33 of the pair of pipe bodies 32 and 33. and wrap the bag body 30 around it. At this time, the air inside the bag body 30 is removed from the other tube body 3.
The liquid is reliably discharged from the through hole 66 formed in 2. This through hole 66 is connected to the bag body 30 of the tube bodies 32 and 33.
From the through hole 66 of the other tube body 32,
This ensures that the air is evacuated as described above.

Embodiment FIG. 1 is a sectional view showing the basic configuration of the present invention. The present invention is suitably implemented in order to carry out work such as replacing the transport pipe 1 at a construction site indicated by reference numeral L on the gas transport pipe 1 that is buried underground and transports city gas. Construction location L of transport pipe 1
Two operation holes 2 and 3 are bored on both sides of the hole. A U-shaped water column gauge, which is a pressure gauge 4, is connected to one of the operation holes 2, and the pressure inside the transport pipe 1 is measured. A sealing bag 30 is inserted from the other operation hole 3 closer to the construction site L with respect to the other operation hole 3 . A pressure gauge 6, such as a U-shaped water column gauge, is also connected to the operation hole 3. Bag body 30
A fluid such as compressed air is supplied to the bag body 3.
0 will inflate to the extent that it does not block the transport pipe 1. By observing changes in the pressure gauges 4 and 6 at this time, it can be determined whether the gas supply in the transport pipe 1 is double-pushing or single-pushing, as will be described later.

2 is an exploded perspective view of the working device 7 installed in relation to the operation hole 3, FIG. 3 is a sectional view of the working device 7, and FIG. 4 is a plan view of the working device 7. . With reference to these drawings, work device 7
has a mounting member 8 extending perpendicularly to the pipe axis of the transport pipe 1. This mounting member 8 has a mounting hole 9 and a mounting notch 10 formed therein. One threaded portion 12 of a U-shaped bolt 11 surrounding the transport pipe 1 is inserted through the mounting hole 9 and screwed into a nut 13 . Another threaded portion 14 of the U-shaped bolt 11 engages with the mounting notch 10 and is screwed into the nut 15. In this way, the attachment member 8 is fixed to the transport pipe 1. An insertion hole 16 formed in the mounting member 8 is connected to the operation hole 3 formed in the transport pipe 1 in a corresponding airtight manner. A right cylindrical base 17 that is connected to the insertion hole 16 is erected on the mounting member 8 . The operation hole 3 can be opened and closed by a plug 18 made of a magnetic material, and the plug 18 can be held by a chuck 19 containing a permanent magnet or the like housed in the base body 17. The chuck 19 is connected to the lower end of the operating rod 20. The other end of the operating rod 20 is connected to a handle 21 on the outside of the base body 17. The operating rod 20 is airtightly displaceable in the axial direction and circumferential direction of the operating rod 20 by a gasket 22 on the upper part of the base body 17. A butterfly bolt 24 is screwed into a cylinder 23 attached to the upper part of the base body 17, and by tightening the butterfly bolt 24, the operating rod 20 is displaced upward in FIG.
It can be maintained in the state shown in .

The base end portions of guide tubes 26 and 27 that extend obliquely upward along the axial direction of the transport tube 1 are connected to the side wall of the base body 17 . The free ends of the guide tubes 26 and 27 are
It is closed by closing members 28 and 29. Inside the guide tubes 26 and 27 are flexible sealing bags 30 and 3.
1 is stored. A pair of tube bodies 32 and 33 attached to the bag body 30 are inserted through insertion holes 34 and 35 formed in the closing member 28. The tubes 32 and 33 are inserted into a packing 36 installed in the guide tube 26 near the closing member 28 to achieve airtightness. The tubes 32 and 33 are axially displaceable and angularly displaceable about their axes. Pipe bodies 37 and 38 are connected to the other bag body 31 in the same manner. This pipe body 3
7 and 38 are inserted through insertion holes 39 and 40 formed in the closing member 29. The tubes 37 and 38 are movable in their axial direction and angularly displaceable in their circumferential direction. The packing 41 achieves airtightness.

A pipe joint 42 is attached near the top of the base 17. The pipe fitting 42 is provided with a mounting tube 44 having a pipe fitting 43 connected thereto. A pipe joint 45 facing upward is attached to the attachment tube 44 .
A pipe joint 47 is attached to the lower end of the diffusion pipe 46 . The pipe joints 45 and 47 are so-called click joints, and when they are connected, gas can flow through them, and when they are separated, the pipe joint 45 is closed and the mounting tube is closed. 44
The gas inside will not be released to the outside,
It is airtight. Connection and disconnection of the pipe joints 45 and 47 can be performed by simple operations.

Insertion holes 3 formed in the closing members 28 and 29
4, 35; 39, 40 are distributed on the left and right sides of the pipe axis of the transport pipe 1 when the mounting member 8 is attached to the transport pipe 1, as clearly shown in FIG. As a result, when the bags 30, 31 in the guide tubes 26, 27 are individually inserted into the transport pipe 1 from the insertion hole 16 and the operation hole 3 through the inside of the base body 17, the bags 30, 31 are inserted into the tube body. 37, 38; 32, 3
Although the bags 30 and 31 are slightly in contact with the transport pipe 3, the bag bodies 30 and 31 can be smoothly inserted into the transport pipe 1, and can be easily removed from the transport pipe 1.

A pressure gauge 6 realized by a U-shaped water column gauge or the like is attached to the mounting tube 44 .

Referring to FIG. 5 1, the intraductal closure device 57 according to the present invention basically consists of a flexible bag body 30
and a pair of flexible tube bodies 32 and 33 having a through hole 66 formed in a portion extending into the bag body 30. The bag body 30 is flat when no compressed air is supplied therein, and its plane is a right quadrilateral. The bag body 30 is made of cloth-lined rubber or the like. The tube bodies 32 and 33 are connected to the side part 49 of the bag body 30,
These tubes 32 and 33 communicate with each other within the bag 30 along the tube 50 . The tubes 32, 33 are flexible and relatively rigid in the axial direction, so the tubes 32, 33 are flexible and relatively rigid in the axial direction.
The bag 30 can be inserted into the transport pipe 1 by pushing in the bag 33, and is made of, for example, acrylic resin. The tube bodies 32, 33 are connected to an air pump 53 by pipe fittings 51, 52 called clicks.

When inserting the bag 30 into the transport pipe 1, there is a
The through hole 66 is formed in the surface facing one tube body 33 as described above, and in the same way, the other tube body 33 is
A through hole similar to the aforementioned through hole 66 is formed on the surface of each of the two tube bodies 33 facing the tube body 32 .

When inserting the bag 30 into the transport pipe 1, the pipe bodies 32 and 33 are separated from the air pump 53 by the pipe joints 51 and 52, and then the pipe body 32 is moved around its axis. Alternatively, the two tubes 32 and 33 are wound around their axes in mutually opposite directions to obtain the condition shown in FIG. 53, or alternatively, the tubes 32, 3
One of the pipe bodies 33 of 3 is shown at arrow 74 in FIG.
It can be wound in the direction shown in FIG. 5 to form the state shown in FIG. In this way, from the guide tube 26 to the transport pipe 1
The bag 30 can be smoothly inserted into the interior, damage to the bag 30 can be avoided, and the bag 30 can be easily removed from the transport pipe 1.

Inside the base body 17 of the working device 7, the chuck 19 holding the plug 18 is placed in the raised position as shown by the imaginary line 25 in FIG. It is pushed through the base body 17 and inserted into the transport pipe 1. As a result, the bag body 30 is positioned closer to the construction site L with respect to the operation hole 3. A state in which the bag body 30 is inserted into the transport pipe 1 is shown in FIG. 6 1, and a simplified cross-section of the transport pipe 1 taken perpendicular to the axis is shown in FIG. 6 2. Pipe body 3
2 and 33 are rotated in opposite directions about their axes as shown by arrows 54 and 55 in FIG. Each is wrapped.

The bag 30 is then unfolded as shown in FIG. 71. In this state, the axis-perpendicular cross section of the transport pipe 1 is as shown in FIG. 72. The bag body 30 in the state shown in FIG. 6 above is shown in FIG.
To obtain the state shown in FIG. 7, the tubes 32 and 33 are turned in the opposite direction to the arrows 54 and 55, as shown by reference numerals 56 and 57 in FIG. 7. This allows the bag 30 wrapped around the tubes 32 and 33 to be expanded.

Therefore, as shown in FIG.
1 and 52 connect the pipe bodies 32 and 33 and the air pump 5
3, and the air pump 53 connects the pipe body 3.
Compressed air is supplied into the bag body 30 through the air passages 2 and 33. A state in which the bag body 30 is slightly inflated is shown in FIG. 81, and a cross-section perpendicular to the axis of the transport pipe 1 in this state is shown in FIG. 82. Bag body 30
By further supplying compressed air to the eighth
As shown in FIG. 3, the bag 30 is inflated, and before the bag 30 blocks the transport pipe 1, the pressure is observed by the pressure gauges 4 and 6 as will be described later.

When the bag body 30 is sufficiently inflated, the transport pipe 1 can be completely closed as shown in FIG. This also applies to the other bag 31.

FIG. 10 shows the experimental results of the inventor. 10, the bag 30 is inserted into the transport pipe 1 shown in FIG. 1, and compressed air is supplied to the bag 30 from the state shown in FIG. 7 as shown in FIGS. 8 and 9. At this time, pressure changes measured by pressure gauge 4 or pressure gauge 6 are shown. Transport pipe 1 has a diameter of 150 mm from the right side of Figure 1.
City gas is supplied at mmH ₂ O and 71.8 m ³ /h. When compressed air was supplied to the bag 30 at a constant flow rate, the pressure change measured by the pressure gauge 4 decreased relatively slowly, as shown by line 1.

For reference, a bag was connected to the tip of a single tube, the bag was inserted into transport pipe 1, and compressed air was supplied to the tube at a constant flow rate to inflate the bag. The pressure change detected by the pressure gauge 4 at this time changes rapidly, as shown by line 2. The bag connected to the tip of the single tube is folded with a breakable tape and inserted into the transport pipe 1, and compressed air is supplied to the bag. Then, the bag expands, and this expansion force causes the tape to break, and the bag expands within the transport pipe 1. According to such a configuration, the inside of the transport pipe 1 is closed in a short time. Therefore, it is difficult to observe changes in the pressure inside the transport pipe 1 along with the inflation state of the bag using the pressure gauge 4 or the pressure gauge 6. On the other hand, according to the present invention, when compressed air is supplied to the bag body 30 at a constant flow rate, the pressure change observed by the pressure gauge 4 or pressure gauge 6 is shown by line 1. Therefore, the transport pipe 1 will not be erroneously sealed by the bag body 30, and the risk of blocking gas transport through the transport pipe 1 will be reliably eliminated.

After the bag 30 is used in the transport pipe 1, it is returned to the transport pipe 1.
When removing the bag body 30 from the pipe fitting 5,
Pipe bodies 32, 33 and air pump 53 by 1, 52
The connection state with the bag body 30 is released, the tube bodies 32 and 33 and the air pump 53 are removed, and the compressed air inside the bag body 30 is released to the outside. Thereafter, for example, as shown in FIG. 5, one of the tubes 32 and 33 is rotated around its axis as indicated by the arrow 74. As a result, the air remaining in the bag body 30 is transferred to the other tube body 3.
Flows to the 3rd side. In this way, it is possible to ensure that no air remains within the bag body 30. With the bag 30 wrapped around the one tube 32 in this manner, the tubes 32 and 33 can be pulled and returned from inside the transport pipe 1 through the base 17 and into the guide tube 26.

Referring to FIG. 11, the procedure for cutting out and replacing the construction site L of the transport pipe 1 will be described. First of all
1 As shown in Figure 1, operation holes 2 and 3 are provided in the transport pipe 1.
A pressure gauge 4 is attached to the operation hole 2. The operating device 7 is attached to the operating hole 3, and the plug 18 (see FIG. 3) that has previously closed the operating hole 3 is removed by operating the handle 21, and the bag 30 is removed by operating the handle 21.
Then, the pipe bodies 32 and 33 are inserted into the transport pipe 1 by pushing them. The bag body 30 is inserted closer to the construction site L with respect to the operation hole 3. Whether the bag body 30 has reached the optimal position within the transport pipe 1 is determined by the tube body 3.
It can be known from the outside by the marks displayed in advance at 2 and 33. When compressed air is not supplied to the bag body 30, the pressure gauge 4 and the working device 7
Compare the pressure measured by the pressure gauge 6 attached to the pressure gauge 4 and confirm that the pressure values measured by the pressure gauges 4 and 6 are the same.

Therefore, the bag 30 is changed from the state shown in the sixth figure to the state shown in the seventh figure, and then compressed air is supplied into the bag 30 by the air pump 53. As a result, the bag body 30 gradually inflates. Observe the pressure values on the pressure gauges 4 and 6 before the bag 30 blocks the transport pipe 1. At this time, if there is no pressure change in either the pressure gauges 4 or 6 and the pressure remains the same, gas is being supplied to the transport pipe 1 from both sides of the bag body 30, which is a so-called double-pressure supply. It turns out that there is something. At this time, compressed air is further supplied to the bag body 30 to close the transport pipe 1 as shown in FIG. 11 and 2. Similarly, another bag 31 is inserted into the transport pipe 1 using the working device 7 and inflated, and the transport pipe 1 is closed as shown in FIG. 11, 3. A dissipation pipe 46 is attached to the working device 7 through pipe joints 45 and 47. Similarly, operation hole 2
From then on, using a working device 7a having the same configuration as the working device 7, the bags 30a and 31a are inserted into the transport pipe 1.
The transport pipe 1 is cut off by inserting the pipe into the pipe. Since the working device 7 is equipped with the dissipation pipe 46, the bags 30, 3
1, the gas in the space inside the transport pipe 1 is dissipated into the atmosphere, and the bags 31, 31a
The city gas that passes between the pipe wall and the pipe wall of the transport pipe 1 can be dissipated into the atmosphere. The same applies to the other working device 7a. In this way, with the transport pipe 1 blocked by the bags 30, 31; 30a, 31a, it is possible to cut out and replace the construction site L.

Referring to FIG. 12, another procedure for removing and replacing the construction site L will be described. The procedure for storing the bag 30 in the transport pipe 1 using the working device 7 and inflating the bag 30 to the extent that the transport pipe 1 is not blocked is described in relation to FIG. 11 above. The procedure is similar to that described above. At this time, when a change occurs in the pressure values of the pressure gauges 4 and 6 and it is observed that the pressure values of both the pressure gauges 4 and 6 become different from each other, the transport pipe 1 is connected to the bag body 30 only from either the left or right side. It can be seen that the gas is supplied in a so-called one-sided supply. At this time, the bag 30 is contracted and returned to the guide tube 26 of the working device 7 for storage. Therefore, as shown in FIG. 12, connecting holes 61 and 62 are formed in the transport pipe 1 on the outside of the pipe axis of the operation holes 2 and 3, and these connecting holes 61 and 62 are connected to each other by a bypass pipe line 63. Connect. With the bypass pipe line 63 connected to the transport pipe 1 in this way, the bag 30 is again inserted into the transport pipe 1 by the working device 7 as shown in FIG. occlude. Similarly, the bag 31 is inserted into the transport pipe 1 to shut off the transport pipe 1. Also, the working device 7a is attached to the operation hole 2, and the bags 30a, 31
The transport pipe 1 is shut off by a. Therefore, the gas in the transport pipe 1 including the construction site L can be dissipated in the same manner as described above, and the construction site L can be cut out and replaced.

In this way, there is no need to use paper tape or O-rings to bind the bag body 30 as in the past, and therefore, when compressed air is introduced into the bag body 30, the force directed outward in the radial direction is used. There is no fear that the transport pipe 1 will be suddenly closed at the moment the paper tape or the like breaks.

The present invention can be widely implemented not only in connection with a city gas transport pipe, but also in relation to a transport pipe that transports other gases.

Effects As described above, according to the present invention, by simply rotating the tubes 32 and 33 fixed along a pair of mutually opposing sides of the bag 30, the bag 30 can be connected to a transport pipe. Insertion and removal are extremely easy, and work efficiency is significantly improved.

In particular, according to the present invention, the bag body 30 is flat when no compressed air is supplied to the inside thereof;
Moreover, its plane is a right-angled quadrilateral, and one end of each of the tubes 32 and 33 is inserted along the pair of opposing sides and fixed to the bag 30, so that, for example, the fifth As shown in Figure 4,
When one tube body 33 is rotated around its axis and the bag body 30 is wrapped around it, the air remaining in the bag body 30 flows through the through hole 66 of the other tube body 33 to the other tube body 32. It is then discharged. Therefore, the bag 30 can be inserted into and removed from the transport pipe while the bag 30 is reduced in size, improving workability and preventing damage to the bag 30.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is an exploded perspective view of the working device 7, FIG. 3 is a sectional view of the working device 7, FIG. 4 is a plan view of the working device 7, and FIG.
The figure is a perspective view showing the bag body 30 and the tube bodies 32, 33, etc.; Figures 6, 7, and 8 are diagrams for explaining the procedure for inflating the bag body 30 in the transport pipe 1; and Figure 9. 10 is a graph showing the experimental results, and FIG. 11 is a sectional view for explaining the procedure for measuring the pressure of the transport pipe 1. FIG. 12 is a sectional view for explaining another procedure for measuring the pressure of the transport pipe 1, and FIGS. 13 and 14 are diagrams for explaining the prior art. 1... Transport pipe, 2, 3... Operation hole, 4, 6...
Pressure gauge, 7... Working device, 17... Base, 26,
27... Guide tube, 30, 30a; 31, 31a...
... Bag body, 32, 33; 37, 38 ... Tube body, 53
...Air pump, 57...Pipe closure.

Claims (1)

[Claims for Utility Model Registration] A flexible bag 30, which is flat when compressed air is not supplied into the bag 30, and whose plane is a right quadrilateral. Such a bag 30; and a pair of flexible bags each having one end inserted into the bag 30 along a pair of mutually opposing sides of the bag 30 and fixed to the bag 30. Pipe body 3
2, 33, in which the one end of each tube 32, 33 is formed with a through hole 66 on opposing surfaces within the bag 30; and pipe joints 51 and 52 that removably connect the other ends of the tube bodies 32 and 33 extending outward of the bag body 30 to the air pump 53, respectively. Closure.