JPH07117194B2 - Bag for blocking fluid conduit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is mainly used for repairing an intermediate part of an existing fluid conduit such as a gas pipe or a water pipe or connecting a new branch pipe to the intermediate part. It is used when performing various types of piping work that requires temporary interruption of the internal fluid, such as a fluid conduit that is contracted and can be inserted into and removed from the fluid conduit. The present invention relates to a fluid conduit blocking bag that can be expanded by encapsulation and can be changed into a fluid conduit blocking state in which the circumferential surface is elastically brought into close contact with the inner surface of the fluid conduit over the entire circumference.

[Conventional technology]

In the conventional bag (10) for blocking a fluid conduit, as shown in FIG. 12, the bag body (1) has a plurality of elastic materials made of elliptical rubber or the like adhered at their peripheral ends to each other in an expanded state. The bag body is formed into a spherical shape and is formed so as to be freely foldable by the adhesive portion (15), and the rubber tube middle tube (19) for supplying and discharging the fluid to and from the inside of the bag body (1). It was only directly connected to (1).

[Problems to be solved by the invention]

However, since the bag body (1) and the long tube (19) that are folded without enclosing the fluid are flexible and have no shape retention, the bag for blocking the fluid conduit (10) is used as the fluid conduit (7). In order to insert the bag into the predetermined position in the fluid conduit (7) through the bag inserting slant pipe (26) attached to the bag, as shown in Fig. 13, the long pipe (19) and the bag body (1) are kept. The bag (10) must be pushed into the fluid conduit (7) with the shaping steel wire (34) inserted, and the steel wire ((1) into the long pipe (19) and the bag body (1) ( There is a risk that the insertion work of 34) will take a lot of work and that the bag body (1) will be damaged by the tip of the steel wire (34) when the bag (10) is pushed into the fluid conduit (7). Besides, when inserting the bag (10) through the slant tube (26), as shown in FIG. 13, the length retained by the steel wire (34) is retained. (19) is deflected in an oblique tube (26) inner surface in sliding contact with the bag (10) inserted there is a possibility that not be performed smoothly by the frictional resistance.

An object of the present invention is to allow a bag to be smoothly inserted into a predetermined position in a fluid conduit without any trouble.

[Means for solving problems]

The characteristic configuration of the bag for blocking a fluid conduit of the present invention is that the bag body made of rubber or elastic synthetic resin is made of a cylindrical material in an expanded state, and the bag body is provided with a large number of folds in the circumferential direction over its entire length. Folding to form, and forming in a state in which the large number of folds in a cross-sectional shape are wound in a spiral shape,
Form-keeping portions for maintaining the winding shape of the folds are provided at both ends of the bag main body, and one of the shape-retaining portions seals the bag main body and the other one for supplying and discharging fluid to the inside of the bag main body. In that the rigid tube and the bag body are connected via a flexible short tube,
The effect is as follows.

[Action]

That is, even if the bag body made of a cylindrical material in an expanded state is made of rubber or elastic synthetic resin, a large number of folds formed by folding it in the circumferential direction over its entire length are wound in a spiral shape in a cross-sectional shape. By forming in the attached state,
Each fold forms a gutter shape along the longitudinal direction of the bag body,
The shape-retaining portion that is self-shaped in the longitudinal direction and maintains the winding shape of the folds eventually forms a rod-shaped body that is self-shaped not only in the longitudinal direction but also in the radial direction as a whole. Thus, it can be easily inserted into the fluid conduit.

Then, as shown in FIGS. 8 (a), (b), and (c),
When the rod-shaped bag body (1) is inserted into the fluid conduit (7) through the slant pipe (26), the fluid supply and discharge connected to the bag body (1) through the flexible short pipe (28). By gripping and pushing the hard tube (2) for use in the bag body without contacting the slant tube (26), the pushing force and pushing direction can be surely fixed without using a steel wire as in the conventional case. 1), the rod-shaped bag body (1) can be accurately inserted toward a predetermined position of the fluid conduit (7), and further, the slant pipe (26) is connected to the fluid conduit (7). Bag body (1)
As the rod-shaped back body (1) is slidably contacted with the inner surface of the fluid conduit (7) as the rod-shaped back body (1) enters (8th embodiment).
(A), (b)), compared with the conventional bag body (1) that does not have shape retention, it can be smoothly pushed in with less sliding contact area with less resistance, and the flexible short tube (28) By bending, the relative posture between the rigid tube (2) and the bag body (1) can be changed (Fig. 8 (b)), and the bag body (1) is guided into the fluid conduit (7) within the fluid conduit (7). It can be placed in a posture that suits.

〔The invention's effect〕

Therefore, unlike the conventional case, the work of inserting a steel wire into the bag is not necessary, and the bag can be easily inserted into a predetermined position in the fluid conduit without any labor, improving workability for shutting off the fluid conduit. I was able to do it.

Moreover, as shown in, for example, FIGS. 11 (a), 11 (b), and 11 (c), the conventional bag body (1) and the rigid tube (2) are connected via the flexible short tube (28). Then, it is possible to push it into the slant pipe (26) easily, but in this case, when the bag body (1) enters the fluid conduit (7) from the slant pipe (26), the bag body (1) is pushed into the bag body (1). Since it has no shape retention property, it easily hangs down (Fig. 11 (a)), and even if the hard tube (2) is used to push the bag body (1) into a predetermined position in the fluid conduit (7), Fig. 11 As shown in (b), it is difficult to push in due to the large contact resistance between the bag body (1) and the fluid conduit (7), and the short tube (28) and the bag body (1) are bent to make the bag. When the body (1) is filled with a fluid and inflated, the bag body (1) is surrounded by the fluid conduit (7) over the entire circumference as shown in FIG. 11 (c). In the present invention, when the bag body (1) held in the shape of a rod enters the slant pipe (26) into the fluid conduit (7), it may not be possible to shut off the fluid without coming into close contact with the surface. Since the approach direction is easily determined and the contact area with the fluid conduit (7) is small, it can be easily placed at a predetermined position in the fluid conduit (7) by pushing with the hard pipe (2), and rubber or elastic is used. As shown in FIG. 8C, the bag body (1) made of synthetic resin and sealed at one side of the shape-retaining portion is expanded by enclosing the fluid and is surrounded by the fluid conduit (7). The inner surface of the fluid conduit (7) can be reliably brought into close contact with the inner surface of the fluid conduit (7) at a predetermined position, so that the fluid blocking work for the fluid conduit (7) can be reliably performed.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

The bag (10) for shutting off a fluid conduit of the present invention, as shown in FIG. 6, repairs the middle portion of a fluid conduit (7) such as a gas conduit over a certain length range or by replacing it. When performing construction, perforating the fluid conduit (7) near both ends of the construction section (A) as shown in FIGS. 6 and 7,
Punching device for blocking and temporary contact without blow (25)
It is used for airtightly shutting off the fluid by installing the same and inserting it obliquely into the fluid conduit (7) through the oblique pipe (26) provided in the perforation device (25), and is shown in FIG. As shown in FIG. 2, it is normally in a contracted state, and by enclosing a gas such as air through a hard pipe (2) for supplying and discharging a fluid, as shown in FIG. ) Is elastically adhered to the inner surface of the inner wall of the pipe, and thus the fluid conduit (7) is airtightly and watertightly shut off.

In forming the bag (10), as shown in FIGS. 1 to 5, the bag body (1) is made of a flexible rubberized cloth and is made of a cylindrical material in an expanded state. ) Is provided, the bag body (1) is folded along its entire length so as to form a large number of folds (23) in the circumferential direction, and a large number of folds (23) are wound in a cross-sectional shape in a spiral shape. The shape-retaining part (3 that maintains the winding shape of the folds (23)
0) is provided on both ends of the bag body (1) to seal the bag body (1) in one of the shape-retaining parts (30) and to supply and discharge a fluid to and from the inside of the bag body (1) on the other side. (2) and the bag body (1) are connected via a flexible short tube (28).

A hard stopper (4) and a bottomed tubular first metal tubular member (5) are provided to seal one end of the bag body (1), and the other end of the bag body (1) is flexible. Sexual short pipe (28)
A second metal cylinder member (6) for inserting a connecting pipe (3) for connecting the bag to the bag body (1) and hermetically sealing the other end in cooperation with the connecting pipe (3) is provided. There is.

That is, the structure of the connecting portion between the bag body (1) and the flexible short pipe (28) will be described. As shown in FIG. 2, a connecting pipe made of a metal tube is provided in the end portion of the bag body (1). (3) The first inner cylinder part (8) is inserted, and the rubber pipe (9) and the second metal cylinder member (6) are covered on the outside of the end of the bag body (1) to form the second metal cylinder. The second metal cylinder member (6) is deformed to the first inner cylinder part (8) side of the connection pipe (3) by crimping the member (6) by applying force from the outside, and the bag body (1). ) And the rubber tube (9) are elastically sandwiched between the second metal tube member (6) and the first inner tube portion (8), and the bag body (1) and the rubber tube (9) are also held. To the inner surface of the second metal cylinder member (6) and the outer surface of the first inner cylinder part (8) to connect the connecting pipe (3) to the bag body (1) in an airtight manner. A.

A locking portion (11) is provided on the outer peripheral surface of the first inner tubular portion (8) of the connecting pipe (3) so as to project over the entire circumference thereof, and is located inside the end portion of the second metal tubular member (6). The collar (13) that is bent to
It is locked between the large diameter part (14) and the locking part (11) of the connecting pipe (3). Further, a brim piece (16) curved outward in a sectional view is formed at an end portion of the second metal cylinder member (6) on the bag body (1) side so that the bag body (1) is not damaged. It has become.

Further, a second inner cylinder part (17) is provided on the side opposite to the bag body (1) with respect to the large diameter part (14) of the connecting pipe (3), and the second inner cylinder part (17) is provided in the same manner as described above. The inner tubular part (17) is inserted into the flexible short tube (28) made of polyurethane, and the first caulking tubular member (18) is externally fitted to the outer side of the flexible short tube (28), Thereafter, the first caulking tubular member (18) is caulked, so that the end portion of the flexible short pipe (28) is separated from the second inner tubular portion (17) and the first caulking tubular member (18). The flexible short pipe (28) is firmly connected to the connecting pipe (3) by sandwiching the flexible short pipe (28).

The other end of the flexible short pipe (28) is connected to the hard pipe (2) made of steel by using a joint member (12). That is, the joint member (12) is screwed to one end of the hard pipe (2), and the second caulking tubular member (35) is externally fitted inside the connecting tubular portion (12A) of the joint member (12). The other end of the short pipe (28) is inserted and the second crimping tubular member (35) is crimped to connect the short pipe (28) to the joint member (12).

On the other hand, the other end of the bag body (1) has the same structure as described above, and a metal stopper (4) is inserted into the bag body (1) from the end of the bag body (1), (1) is covered with a rubber tube (27), and a first metal cylinder member (5) having a bottomed cylindrical shape that surrounds the outside is externally fitted, and the first metal cylinder member (5) is caulked for sealing. Has been done.
As shown in FIG. 9, the bottom portion (5A) of the first metal cylinder member (5) has a flat shape, and the outer peripheral portion (5B) is pressed at the time of caulking. It bulges and deforms into a projecting shape as shown in FIG. 2, which means that even when the bag (10) is inserted into the fluid conduit (7), it contacts the inner surface of the fluid conduit (7). It is an effective shape because it slides well. Next, the production of the bag body (1) will be described. As shown in FIG. 3, a rubberized cloth (21) formed by drawing rubber on a nylon base cloth (20) is wound in a cylindrical shape, The end portions are overlapped with each other and adhered with an adhesive to form a cylindrical body (22). The warp threads of the base fabric (20) are arranged along the longitudinal direction of the tubular body (22), the weft threads are arranged along the circumferential direction of the tubular body (22), and the warp threads have less elongation than the weft threads. ,and,
The fiber having high tensile strength is used to increase the pressure resistance of the bag body (1). Then, as shown in FIG. 4, the cylindrical body (22) is circumferentially provided with a large number of folds (2).
3) and then fold each fold (23) in one direction so as to form a spiral cross section as shown in FIG. 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 portion of the bag body (1) is first inserted through the rubber tube (27). 1 While caulking with the metal tube member (5), insert the connection pipe (3) into the other end of the bag body (1) and insert the end of the bag body (1) into the first part through the rubber tube (9). The two metal tubular members (6) are caulked to form the shape retaining portion (30) that retains the spiral state of the folds (23). With this configuration, the fluid conduit blocking bag (10) is shaped like a rod by the large number of folds (23) and the shape-retaining portion (30) when the fluid is not enclosed.
For example, even if one end of the fluid conduit blocking bag (10) is held by hand, the other end does not bend downward due to its own weight, and when the fluid is sealed, the large number of folds (23) are formed. The folds are opened to form a cylindrical shape.

The first metal cylinder member (5) and the second metal cylinder member (6) are each made of a steel material that is plastically deformable under a set load, and the polyurethane flexible short tube (28) is
Grasping the rigid tube (2) and holding the bag body (2) with the oblique tube (26)
The JIS spring hardness is set to a hardness of 70 to 98 degrees so that the pushing force and the pushing direction can be efficiently transmitted when pushing from the inside into the fluid conduit (7).

Next, the case of inserting the fluid conduit blocking bag (10) configured as described above into the gas conduit (7) as a fluid conduit to seal the gas conduit (7) will be described.
As shown in FIGS. 6 to 8 (a), (b) and (c), the perforation device (25) is attached to the gas conduit (7) near the required location to form one hole (24). Then, while holding the rigid pipe (2) and pushing it in a straight line in an oblique direction, the slant pipe (26) attached to the perforation device (25) and the fluid conduit blocking bag in a rod state contracted through the hole (24) ( 10) is inserted into the gas conduit (7), and when the tip of the first metal tubular member (5) provided at the tip of the bag body (1) contacts the inner surface of the gas conduit (7), metal and metal The first metal cylinder member (5) guides the bag (10) to a deep position of the gas conduit (7) while sliding lightly in the gas conduit (7) by a contact action with less frictional resistance with.

At this time, the flexible short tube (28) is replaced with the hard tube (2).
In order to change the relative posture between the bag body (1) and the rigid pipe (2) while transmitting the pushing force from the bag body (1), the bag body (1) is in a posture substantially along the gas pipe (7). It becomes easy to enter the deep position of (7) (FIG. 8 (a) to FIG. 8 (b)).

Then, by enclosing a gas such as air in the fluid conduit blocking bag (10) through the hard tube (2) and the short tube (28), the folds (23) are expanded and expanded to block the fluid conduit. The outer peripheral surface of the bag (10) is brought into close contact with the inner surface of the gas conduit (7) to block the passage of gas in the gas conduit (7) (Fig. 8 (c)).

In the punching device (25) of FIG. 7, reference numeral (32) is a bypass pipe that allows gas to flow by bypassing between the punching devices (25) and (25), and (33) is a bypass flow path (R). ) Is a shutter device for blocking.

[Another embodiment]

The hard pipe (2) may be a pipe made of a hard synthetic resin other than the steel pipe.

In the above embodiment, the shape-retaining parts (30) formed at both ends of the bag body (1) are sealed by caulking using the first metal cylinder member (5) and the second metal cylinder 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 by bonding with an adhesive. In this case, the connection pipe (3) may be formed of a soft resin pipe.

The flexible short tube (28) may be a tube made of 12 nylon or soft vinyl chloride resin, or polyethylene resin, or rubber, in addition to the tube made of polyurethane, and JIS. A spring type soft tube having a hardness of 70 degrees or less or a tube whose hardness is substantially increased by a reinforcing wire or a reinforcing member may be used as long as it is highly flexible.

The connection pipe (3) and the short pipe (28), or the short pipe (28) and the hard pipe (2) are bonded or banded in addition to being connected by the joint member (12) using caulking. Alternatively, as shown in FIG. 10, they may be integrally connected with each other by a joint metal fitting (36) or the like utilizing the locking action of the wedge member (37).

Further, in manufacturing the bag body (1), in the above-mentioned embodiment, one rubberized cloth (21) was wound in a tubular shape and adhered, but it may be formed into a tubular shape by extrusion molding. good. In this case, since no adhesive portion is formed on the peripheral surface of the bag body (1) at all, the gas sealability in the conduit can be improved. Further, the bag body (1) has flexibility and gas. Although the rubberized cloth (21) was used to provide pressure resistance when it was encapsulated, it is also possible to use only a rubber material with no embedded base cloth, or a flexible polyurethane, polyethylene, etc. An elastic synthetic resin material can be used instead of rubber. Further, as the base fabric (20), other synthetic fibers such as cotton or Tetron can be used in addition to nylon.

Further, the material of the first metal cylinder member (5) and the second metal cylinder member (6) may be formed of aluminum or other metal other than steel, and may be replaced by a metal cylinder member. Alternatively, a hard synthetic resin tubular member may be used. The material of the stopper (4) and the connecting pipe (3) is
Besides metal, a hard synthetic resin material such as polyamide resin may be used. Further, the locking portion (11) and the large diameter portion (1
4), the collar part (16) can be omitted.

The peripheral surfaces of the first and second inner cylindrical portions (8) and (17) and the plug (4) may be formed as smooth uneven surfaces instead of being formed as smooth surfaces.

First metal cylinder member (5) located at the tip of the bag (10)
Is formed so that the tip side is formed into a smooth spherical shape before caulking, and when it comes into contact with the fluid conduit (7), it smoothly slides to enter a predetermined position in the fluid conduit (7). Is also good.

The bag body (1) may be filled with liquid instead of being filled with gas.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a fluid conduit blocking bag according to the present invention. Fig. 1 is an overall side view, Fig. 2 is a partially cutaway side view showing an inflated state, and Figs. 3 to 5 are bags. FIG. 6 is a perspective view showing a method for producing the main body, FIG. 6 is a side view showing a state in which a perforation device is attached to a gas conduit, FIG. 7 is a partially cutaway side view of the perforation device attached to a gas conduit, and FIG. , (B), (c)
Is an explanatory view showing the insertion work, FIG. 9 is a side view of the front end portion of the bag, which is partially cut away, and FIG. 10 is a partial sectional view showing a connection structure of another embodiment, and FIG. 11 (a). , (B) and (c) are explanatory views showing the insertion work of the comparative example, FIG. 12 is a side view showing a conventional example, and FIG. 13 is a partial cross-sectional view of a conventional bag inserted into a gas conduit. Is. (1) …… Bag body, (2) …… Hard tube, (7) ……
Fluid conduit, (23) …… fold, (28) …… flexible short pipe, (3
0) …….

Claims (1)

[Claims] 1. A bag body (1) made of rubber or elastic synthetic resin is made of a cylindrical material in an expanded state, and the bag body (1) is provided with a large number of folds (2) in the circumferential direction over the entire length thereof.
(3) to form a shape-retaining part (30) that maintains the winding shape of the folds (23) by forming the plurality of folds (23) in a spiral shape in a cross-sectional shape. ) Are provided at both ends of the bag body (1) to seal the bag body (1) on one side of the shape-retaining part (30) and to supply and discharge the fluid to the inside of the bag body (1) on the other side. Rigid tube (2) and the back body (1)
A bag for shutting off a fluid conduit, which is connected to the above via a flexible short tube (28).