JPS63130991A - Bag for interrupting fluid conduit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is mainly applicable to repairing the middle part of an existing fluid conduit such as a gas pipe or water pipe, or when connecting a new branch pipe to the middle part. It is used when performing various types of piping work that require temporary shutoff of internal fluids, such as in the fluid conduit non-blocking state in which the fluid conduit is contracted and can be freely inserted into and removed from the fluid conduit. The present invention relates to a fluid conduit blocking bag that can be inflated by sealing and can be changed into a fluid conduit blocking state in which its peripheral surface is elastically brought into close contact with the inner surface of the fluid conduit over the entire circumference, and more specifically, it is made of rubber or elastic synthetic resin. The present invention relates to a bag for blocking a fluid conduit, which includes a bag body and a connecting pipe for connecting a fluid supply pipe to the inside of the bag body.

[Conventional technology]

As shown in FIG. 10, a conventional fluid conduit blocking bag (10) is constructed by gluing together a plurality of elliptical elastic materials (28) at their circumferential ends so that they become spherical when inflated. This fluid conduit blocking bag (1
0) is formed to be foldable at the adhesive portion (29), and in order to insert and remove this fluid conduit blocking bag (10) into and out of the fluid conduit (7), the steps shown in FIGS. 9 and 10 are as follows. As shown, the bag was folded flat at the adhesive portion (29) and inserted into and removed from the fluid conduit (7) through a hole (24) bored in the fluid conduit (7). [Problems to be Solved by the Invention] However, since the conventional fluid conduit blocking bang (10) is made of a material that is flexible to begin with, it cannot be used in a state where no fluid is sealed. If it is folded flat, it does not retain its shape, and furthermore, since the fluid conduit blocking bag (10) has a large oval shape in the folded state, the fluid conduit (7) does not retain its shape. ), as shown in Figure 9, insert the fluid conduit blocking bag (10
) in a folded state by hand, wrap the tape (34) to keep it in a reduced diameter state, and open the hole (
This fluid conduit blocking bag (10) has to be inserted into the fluid conduit (7), which has the disadvantage of poor workability, and also because it does not retain its shape as described above.
) had the disadvantage of being difficult to insert deeply into the body.

Further, even when the fluid conduit blocking bag (10) is taken out from inside the fluid conduit (7), the fluid conduit blocking bag (10) is likely to rub or get caught on the inner edge of the hole (24), and the fluid conduit There was a drawback that the blocking bag was easily damaged.

The present invention has been made with attention to the above-mentioned circumstances, and
By keeping the fluid conduit blocking bag in a rod shape, it is easy to work inside the fluid conduit (it can be inserted easily and deep into the conduit, and it does not rub or get caught on the inner edge of the hole when taking it out from the fluid conduit). It is an object of the present invention to provide a fluid conduit blocking bag that can be taken out without any trouble.

[Means for solving problems]

That is, the characteristic configuration of the fluid conduit blocking bag according to the present invention is that the bag body is made of a cylindrical material in an expanded state;
The bag main body is folded to form a large number of folds in the circumferential direction along its entire length, and the large number of folds are wound in a spiral shape in a cross-sectional shape, and the winding of the folds is A shape-retaining part that maintains the shape is provided at each end of the bag body, one of the shape-retaining parts seals the bag body, and the other part is fitted with a connecting pipe. The function and structure are as follows.

[For production]

In other words, the bag body is made of a cylindrical material when inflated, and the bag body is folded to form a number of folds in the circumferential direction along its entire length, as shown in FIG. By forming the plurality of pleats into a spirally wound state, each pleat forms a gutter shape along the longitudinal direction of the lug body, resulting in self-retention in the longitudinal direction. Since a large number of gutter-shaped folds are arranged in the circumferential direction of the bag main body, a rod-shaped body is formed as a whole that has self-shape retention not only in the longitudinal direction but also in the radial direction.

In addition, shape-retaining parts are provided at both ends of the bag body to maintain the shape of the folds, so the shape-retention parts prevent the folds from returning, and the folds are wrapped in a spiral shape. It is possible to preserve the shape of the product.

Furthermore, since the bang body is sealed in one of the shape-retaining parts and the connecting tube is fitted inside the other, the fluid can be hermetically sealed inside the bag body via the connecting tube. I can do it.

〔Effect of the invention〕

As a result, the diameter of the fluid conduit blocking bag is reduced without sealing fluid inside the bag body, and a fluid conduit non-blocking state is created in which the bag can be inserted into and removed from the fluid conduit, and a fluid conduit non-blocking state is created in which the fluid conduit blocking bag is inserted into and removed from the fluid conduit. Of course, it can be freely changed to the state in which the fluid conduit is blocked by filling and inflating the fluid, and the bag body can be kept in a rod shape when the diameter is reduced, so the fluid conduit can be blocked. The bag can be easily inserted into the hole of the fluid conduit while holding the proximal end of the bag by hand, and there is no need to hold it by hand to reduce the diameter of the bag body as in the past, improving work efficiency. can be improved. Moreover, the fluid conduit blocking bag can be guided into the interior in a rod-shaped state and inserted deep into the fluid conduit. Furthermore, even when the fluid conduit blocking bag is taken out from the fluid conduit, the bag body will be reduced in diameter to a rod shape due to the resilience of the folds and the ability of the folds to retain their shape due to the shape retaining part. This allows the fluid conduit blocking bag to be pulled out from the fluid conduit without getting caught on the periphery of the hole in the fluid conduit or rubbing against it, preventing damage to the fluid conduit blocking bag and allowing long-term use. .

〔Example] Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 6, the fluid conduit blocking bag (10) of the present invention can be used for repair work such as repairing or replacing a midway portion of a fluid conduit (7) such as a gas conduit. This is used to airtightly shut off the fluid by inserting it into the fluid conduit (7) at both ends of the construction section (A).

As shown in FIG. 1, this fluid conduit blocking bag (10) is normally in a contracted state, and the fluid supply conduit (2)
By sealing a gas such as air through the tube, it expands as shown in Figure 2, and its peripheral surface elastically adheres to the inner surface of the fluid conduit (7), making the fluid conduit (7) airtight and watertight. Configured to block.

Below, first, the structure of the fluid conduit blocking bag (10) will be explained in detail.

Figure 2 shows the fluid conduit blocking bag (10) in an inflated state.The bag body (1) is made of flexible rubberized cloth, and is formed of a cylindrical material in the inflated state. It is something that exists. One end of the bag body (1) is sealed with a hard stopper (4) and a first metal cylinder member (5), and the other end of the bag body (1) is sealed with a hard stopper (4) and a first metal cylinder member (5).
1) Connect the fluid supply pipe (2) to the bag body (1)
Insert the connecting pipe (3) to be connected to the second metal cylindrical member (
6) is hermetically sealed.

That is, the bag body (1) and the fluid supply pipe (2)
), as shown in Fig. 2, the first inner cylindrical part (8) of the connecting pipe (3) made of a metal cylinder is inserted into the end of the bag body (1). ,
A rubber cylinder (9) and a second metal cylinder member (6) are placed on the outside of the end of the bag body (1), and the second metal cylinder member (6)
By applying force from the outside and tightening, the second metal cylindrical member (6) is deformed toward the first inner cylindrical part (8) of the connecting pipe (3), and the end of the bag body (1) is and rubber tube (9)
is elastically sandwiched between the second metal cylinder member (6) and the first inner cylinder part (8), and the bag body (1) and the rubber cylinder (9) are held between the second metal cylinder member (6) and the rubber cylinder (9). The connecting tube (3) is airtightly connected to the bag body (1) in close contact with the inner surface and the outer surface of the first inner cylindrical portion (8).

A locking portion (11) is provided on the outer peripheral surface of the first inner cylindrical portion (8) of this connecting pipe (3) over the entire circumference, and the position of the locking portion (11) on the end side An uneven part (12) having a sawtooth cross section is provided on the circumferential surface of the first inner cylindrical part (8), and a flange part is bent inward from the end of the second metal cylindrical member (6). (13) is locked between the large diameter part (14) of the connecting pipe (3) and the locking part (11), and when the second metal cylindrical member (6) is crimped, the uneven part (12), the end of the bag body (1) and the rubber cylinder (9) are more strongly and airtightly clamped, and are prevented from being pulled out. Further, a flange piece (16) curved outward in cross-sectional view is formed at the end of the second metal cylinder member (6) on the side of the bag body (1),
This prevents damage to the bag body (1).

Further, a second inner cylinder part (17) is extended outward from the large diameter part (14) of the connecting pipe (3), and the second inner cylinder part (17) is made of nylon in the same manner as described above. Fluid supply pipe (2)
At the same time, by fitting the crimping member (18) on the outside of the fluid feeding tube (2) and then crimping the crimping member (18), the end of the fluid feeding tube (2) is inserted into the fluid feeding tube (2). is sandwiched between the second inner cylindrical portion (17) and the crimping member (18) to connect the fluid supply pipe (2) to the connecting pipe (3) in a highly airtight and strong manner.

The second inner cylindrical portion (17) is also provided with an uneven portion (19) on its circumferential surface so as to improve the connection performance with the fluid supply pipe (2).

On the other hand, the other end of the bag body (1) has the same structure as above, and the other end of the bag body (1) has a structure similar to that described above.
) and the metal stopper (4) inserted inside the bag body (
1) and the first rubber tube (27) that surrounds the outside.
It is sealed by caulking with the metal cylinder member (5).
Next, to explain the production of the bag body (1), as shown in FIG. 3, a rubberized cloth (21) formed by applying rubber to a nylon base cloth (20) is wound into a cylindrical shape.
The ends are overlapped and bonded with adhesive to form a cylinder (22). The warp of the base fabric (20) is arranged along the longitudinal direction of the cylinder (22), and the weft is arranged along the circumferential direction of the cylinder (22), and the warp has less elongation than the weft. , and using fibers with high tensile strength, the hang body (1
) to increase its pressure resistance.

Next, as shown in FIG. 4, the cylindrical body (22) is folded over its entire length to form a large number of folds (23) in the circumferential direction, and then, as shown in FIG. Wrap it in one direction so that it has a spiral cross-sectional shape.

Then, as described above, the stopper (4) is inserted into one end of the bag body (1) in the folded and reduced diameter state, and the end of the bag body (1) is closed through the rubber tube (27). 1. While tightening with the metal cylinder member (5), tighten the bag body (1).
Insert the connecting pipe (3) into the other end of the rubber tube (9).
The end of the bag body (1) is connected to the second metal cylindrical member (6
) to form a shape-retaining portion (30) that retains the spiral shape of the folds (23). If you do this,
In a state where no fluid is sealed, the fluid conduit blocking bag (10) is retained in a rod shape by the numerous folds (23) and the shape retaining portion (30). ), no matter which end is held by hand, the other end will not bend downward under its own weight, and when fluid is filled, the folds of the many folds (23) will open and form a cylindrical shape. It is what it is.

The rubber-coated fabric (21) can be produced using the so-called friction method, in which the rubber is rubbed onto the fabric by varying the rotational speed between the rolls, and the topping method, in which the rotational speed between the rolls is adjusted to match the rubber to the fabric. However, either method can be used, and the folds (23) can be formed on the bag body (1) by heating the bag body (1) in a folded state with dry heat or steam. be able to.

Further, the first metal cylindrical member (5) and the second metal cylindrical member (
6) are each made of a steel material that can be plastically deformed under a set load.

Next, the case where the fluid conduit blocking bag (10) constructed as described above is inserted into the gas conduit (7) as a fluid conduit to seal the gas conduit (7) will be described. As shown, connect the gas pipe near the required cutoff point (7
), and the fluid conduit blocking bag (10) is passed through the hole (24) in a contracted rod state.
is inserted into the gas conduit (7), and the fluid supply pipe (
2) is further inserted into the fluid conduit (7), the fluid conduit blocking bag (10) is disposed deep in the fluid conduit (7), and then the fluid conduit blocking bag (10) is placed in the deep position of the fluid conduit (7) through the fluid supply pipe (2). By filling the bag (10) with a gas such as air, the folds (23) are expanded and expanded, and the outer peripheral surface of the fluid conduit blocking bag (10) is closed to the gas conduit (7).
It is placed in close contact with the inner surface of the gas conduit (7) to block gas passage within the gas conduit (7).

Next, the sealing performance (overgas amount) was measured when the gas pressure in the gas conduit (7), the internal pressure of the air sealed in the fluid conduit blocking bag (10), etc. were set, and will be described.

The seal performance test device shown in FIG. 7 was used. In the figure, (7) is a gas conduit with both ends closed, (10
) is a fluid conduit blocking bag inserted into the gas conduit (7), (25) is a flow meter, (26) is a pressure gauge for measuring the pressure inside the fluid conduit blocking bag (10), (32) ) is a pressure regulator, and (23) is a U gauge that measures the gas pressure in the gas conduit (7).

Here, the gas pressure in the gas conduit (7) was set to 200 mmAq, and the internal pressure of the fluid conduit blocking bag (10) was gradually increased, and the amount of overflowing gas at each pressure was measured. Furthermore, after 3 minutes had elapsed at each pressure, measurement was performed for 10 minutes using a flowmeter (25), and the results were converted to 1/hr. The test results are shown in Table 1.

[Another example]

In the embodiment described above, the shape retaining portions (30) formed at both ends of the bag body (1) are sealed by crimping using the first metal cylindrical member (5) and the second metal cylindrical member (6). However, the ends of the bag body (1) may be tightened using a band, or the ends of the bag body (1) may be sealed using an adhesive.
In this case, the connecting pipe (3) may be formed of a soft resin pipe.

In addition, in producing the bag main body (1), in the above embodiment, a piece of rubberized cloth (21) was wound and glued into a cylindrical shape, but it could also be formed into a cylindrical shape by extrusion molding. good. In this case, the adhesive part is attached to the bag body (1).
Since no gas is formed on the circumferential surface of the conduit, the gas sealing property within the conduit can be improved. In addition, the bag body (
In 1), rubberized fabric (21) was used in order to provide flexibility and pressure resistance when gas is enclosed, but it may also be made of rubber material without embedded base fabric. Furthermore, elastic synthetic resin materials such as flexible polyurethane and polyethylene can be used instead of rubber. Furthermore, as the base fabric (20), other than nylon, synthetic fibers such as cotton or Tetron may also be used.

Further, the first metal cylindrical member (5) and the second metal cylindrical member (
As for the material 6), other than steel, it may be made of aluminum or other metals, and a hard synthetic resin cylindrical member may be used instead of the metal cylindrical member. As the material for the plug (4) and the connecting pipe (3), in addition to metal, hard synthetic resin materials such as polyamide resin can also be used. Furthermore, the rubber tube (9) can also be omitted.

The first and second inner cylinder parts (8), (17) and the stopper (4)
) may be formed to have a smooth surface instead of having an uneven surface.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the fluid conduit blocking bag according to the present invention, FIG. 1 is a side view showing the fluid conduit blocking bag in a reduced diameter state, and FIG. 2 is a side view showing the fluid conduit blocking bag in the fluid conduit. 3 to 5 are perspective views showing the method of manufacturing the bag body, and FIG. 6 shows a state in which the fluid conduit blocking bag is inserted into the gas conduit. FIG. 7 is a schematic diagram of a super gas amount test, FIG. 8 is an explanatory diagram showing an insertion operation, and FIGS. 9 to 10 are explanatory diagrams showing a conventional insertion operation. (1)...Bag body, (2)...Fluid supply pipe, (3)...Connecting pipe, (23)...
... folds, (30) ... shapeless part.

Claims (1)

[Claims] A fluid conduit blocking bag comprising a bag body (1) made of rubber or elastic synthetic resin, and a connecting pipe (3) for connecting a fluid supply pipe (2) to the inside of the bag body (1), the bag comprising: The main body (1) is made of a cylindrical material in an expanded state, and the bag main body (1) is folded to form a large number of pleats (23) in the circumferential direction along its entire length, and the cross-sectional shape Shape-retaining parts (30) are provided at each of both ends of the bag body (1), which form a large number of folds (23) in a spirally wound state and maintain the wrapped shape of the folds (23), A bag for shutting off a fluid conduit, in which the bag body (1) is sealed in one of the shape-retaining parts (30), and the connecting pipe (3) is fitted inside the other part.