JPH0453510Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is mainly used when 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 shrinkage, and insertion and removal into the fluid conduit through an insertion hole formed by drilling into the fluid conduit. A fluid conduit cutoff that can be changed freely between a fluid conduit non-blocking state in which the fluid conduit is unblocked and a fluid conduit cutoff state in which the fluid conduit is expanded by sealing in fluid and its peripheral surface is elastically brought into close contact with the inner surface of the fluid conduit over the entire circumference. Concerning the use of bugs.

[Conventional technology]

As shown in FIGS. 9 and 10, a conventional fluid conduit blocking bag 10 has a bag main body 1 made of a large number of elastic materials made of oval rubber or the like, whose peripheral ends are adhered to each other, and when in an inflated state. It was constructed to be spherical and foldable at the adhesive portion 15.

[The problem that the idea aims to solve]

However, since the bag body 1 folded without fluid sealed has poor shape retention, it is difficult to insert the bag 10 into a predetermined position in the fluid conduit 7 through the insertion hole 24 formed in the fluid conduit 7. It is difficult and difficult to work with, and furthermore, it is difficult to insert it deep into the fluid conduit 7. In addition, cut iron chips that were scattered when the insertion hole 24 was drilled remain inside the fluid conduit 7, and these iron chips may damage the bag body or reduce the ability of the bag body 1 to shut off the fluid conduit. so as not to be degraded,
Before inserting the bag body 1 into the fluid conduit 7, it is necessary to remove iron chips from the fluid conduit 7 using a special iron scrap removal tool, which has the drawback of requiring a lot of effort.

An object of the present invention is to provide a bag that can be smoothly inserted into a predetermined position within a fluid conduit without much effort while maintaining high fluid conduit blocking performance.

[Means to solve the problem]

The characteristic configuration of the fluid conduit blocking bag of the present invention is as follows:
A first state in which the bag body made of rubber or elastic synthetic resin has a cylindrical shape in an expanded state; a second state in which the plurality of folds are held in a spirally wound state; and a shape-retaining portion that maintains the wound shape of the folds in a deformable manner at each end of the bag body;
The bag body is sealed at the tip side of the shape retention part, and a fluid supply/drainage pipe for supplying fluid to the inside of the bag body is connected to the rear end side, and a cut iron is connected to the shape retention part at the front end side. The reason is that a magnet for removing debris is provided, and its effects are as follows.

[Effect]

In other words, even if the bag body is made of a material that assumes a cylindrical first state when inflated and is made of rubber or elastic synthetic resin, it has a large number of folds formed by folding it in the circumferential direction along its entire length. By forming the bag in a spirally wound second state, each pleat forms a gutter shape along the longitudinal direction of the bag body, resulting in self-retention in the longitudinal direction. Due to the shape-retaining portion that maintains the wound shape, a rod-shaped body is formed that is self-retaining not only in the longitudinal direction but also in the radial direction, and can be easily inserted into the fluid conduit. .

Moreover, when the bag body is inserted into the fluid conduit through the insertion hole, iron debris remaining in the fluid conduit is removed by adsorption by the magnet provided in the shape-retaining portion on the distal end side.

[Effect of idea]

Therefore, the bag can be easily inserted into a predetermined position in the fluid conduit without much effort, and the bag can be easily inserted into the fluid conduit by simply inserting the bag body through the insertion hole without using a special scrap metal removal tool. By removing residual iron chips, the fluid conduit blocking performance of the bag body could be maintained at a high level, and overall workability for fluid conduit blocking could be greatly improved.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

The fluid conduit blocking bag 10 of the present invention is
As shown in the figure, when performing repair work such as repairing or replacing the middle part of a fluid conduit 7 such as a gas conduit over a certain length range, the fluid conduit near both ends of the construction section A is 7, a perforation device 25 for performing the perforation, interruption, and temporary connection shown in FIGS. 6 and 7 without blowing is attached, and a diagonal pipe 26 provided on the perforation device 25 is inserted into the fluid conduit 7 from an oblique direction. It is used to airtightly shut off fluid by inserting it. As shown in Figure 1, it is normally in a contracted state and is used to seal air or other gas inside through a hard tube 2 for supplying and discharging fluid. ,
As shown in FIG. 2, it expands and its peripheral surface elastically comes into close contact with the inner surface of the fluid conduit 7, thereby blocking the fluid conduit 7 in an airtight and watertight manner.

Then, to form the bag 10, as shown in FIGS. 1 to 5, a bag body 1 is provided, which is made of a flexible rubberized cloth and is made of a cylindrical material in an expanded state. Bag body 1,
It is folded to form a large number of folds 23 in the circumferential direction over its entire length, and has a large number of folds 23 in its cross-sectional shape.
A shape-retaining part 30 that maintains the wrapped shape of the folds 23 is formed in a spirally wound state.
The bag body 1 is sealed at one end of the shape retaining part 30, and the bag body 1 is connected to the hard tube 2 for supplying and discharging fluid to the inside of the bag body 1 through the flexible short tube 28 at the other end. It is connected.

A hard stopper 4 and a first metal cylinder member 5 are provided to seal one end of the bag body 1.
At the other end, a connecting tube 3 for connecting the short flexible tube 28 to the bag main body 1 is inserted, and a second tube is used to airtightly seal the other end in cooperation with the connecting tube 3.
A metal cylinder member 6 is provided.

That is, the bag body 1 and the flexible short tube 28
To explain the structure of the connection part with the bag body 1, as shown in FIG. A rubber cylinder 9 and a second metal cylinder member 6 are placed on the outside of the part, and this second metal cylinder member 6 is
By applying force from the outside and tightening, the second
The metal cylindrical member 6 is deformed toward the first inner cylindrical part 8 side of the connecting pipe 3, and the end of the bag body 1 and the rubber cylinder 9 are moved between the second metal cylindrical member 6 and the first inner cylindrical part 8. The connecting tube 3 is connected to the bag body 1 in an airtight manner by elastically holding the bag body 1 and the rubber cylinder 9 in close contact with the inner surface of the second metal cylinder member 6 and the outer surface of the first inner cylinder part 8. be.

A locking part 11 is provided on the outer peripheral surface of the first inner cylindrical part 8 of the connecting pipe 3 so as to protrude over the entire circumference, and a flange part formed by bending inward from the end of the second metal cylindrical member 6 is provided. 13
is locked to the locking portion 11 of the connecting pipe 3.

Furthermore, in the connecting pipe 3, the bag body 1
A second inner cylindrical portion 17 is extended on the opposite side, and in the same manner as described above, this second inner cylindrical portion 17 is inserted into a flexible short tube 28 made of polyurethane, and the flexible short tube is By fitting the first crimping cylinder member 18 on the outside of the flexible short tube 28 and then crimping the first crimping cylinder member 18, the end of the flexible short tube 28 is fixed to the second inner cylinder part 1.
7 and the first crimping cylinder member 18, the flexible short tube 28 is firmly and airtightly connected to the connecting tube 3.

The other end of the short flexible tube 28 is connected to the hard tube 2 made of steel using a coupling member 12.
That is, the joint member 12 is screwed onto one end of the hard tube 2, and the second
The other end of the short tube 28 with the crimping cylinder member 35 fitted thereon is inserted, and the second crimping cylinder member 35 is crimped to connect the short tube 28 to the joint member 12 .

On the other hand, the other end of the bag body 1 has the same structure as above, with a metal stopper 4 inserted from the end of the bag body 1 into the inside of the bag body 1, and a rubber tube 27 placed over the bag body 1. , a first metal cylindrical member 5 surrounding this outer peripheral portion is fitted onto the outside, and the first metal member 5 is crimped for sealing.

Next, to explain the production of the bag body 1, as shown in FIG.
A cylindrical body 22 is formed by wrapping a rubber-coated cloth 21 formed by applying rubber to a cylindrical shape, overlapping the ends thereof, and bonding them with an adhesive.

The warp threads of the base fabric 20 are arranged along the longitudinal direction of the cylinder body 22, and the weft threads are arranged along the circumferential direction of the cylinder body 22, and the warp threads have less elongation and tensile strength than the weft threads. By using large fibers, the pressure resistance of the bag body 1 is increased. Next, as shown in FIG. 4, the cylindrical body 22 is folded so as to form a large number of folds 23 in the circumferential direction over its entire length, and then, as shown in FIG. Wrap it in one direction so that it forms a shape. Thereafter, as described above, the plug 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 crimped with the first metal cylinder member 5 via the rubber tube 27. At the same time, the connecting tube 3 is inserted into the other end of the bag body 1, and the end of the bag body 1 is crimped with the second metal cylinder member 6 through the rubber cylinder 9, thereby maintaining the spiral state of the pleats 23. The shape retaining portion 30 is formed. 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 many folds 23 and the shape retaining portion 30. For example, one end of the fluid conduit blocking bag 10 Even if held by hand, the other end will not bend downward under its own weight, and when fluid is filled, the multiple folds 23 will unfold to form a cylindrical shape.

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, and the short flexible tube 28 made of polyurethane is made of a soft material. A nylon tube 40 is installed inside the flexible short tube 28 to efficiently transmit the pushing force and direction when the hard tube 2 is gripped and the bag body 1 is pushed from the oblique tube 26 into the fluid conduit 7. It is configured so that

A magnet 4 is provided at the tip of the plug 4 to attract and remove iron chips 42 scattered into the fluid conduit 7 when the fluid conduit 7 is bored by the punching device 25.
1 are adhered via epoxy resin.

Next, the case where the fluid conduit blocking bag 10 configured as described above is inserted into the gas conduit 7 as a fluid conduit to seal the gas conduit 7 will be explained. , C, the perforation device 2 is inserted into the gas pipe 7 near the required location.
5 and drill one hole 24, and while holding the hard tube 2 and pushing it diagonally straight through the diagonal tube 26 attached to the punching device 25 and the hole 24, cut off the fluid conduit in the contracted rod state. for bag 10
into the gas conduit 7, and
A magnet 41 provided at the tip of the bag 10 attracts and collects iron chips 42 in the gas pipe 7, and guides the bag 10 to a deep position in the gas pipe 7 while sliding in contact with the inner surface of the gas pipe 7.

At this time, the short flexible tube 28 bends while transmitting the pushing force from the hard tube 2 to change the relative posture between the bag body 1 and the hard tube 2, so the bag body 1 is connected to the gas conduit 7. The gas conduit 7 can be easily penetrated deep into the gas conduit 7 by taking a substantially parallel posture. (Figure 8 A to Figure 8 C).

Next, by sealing gas such as air into the fluid conduit blocking bag 10 through the hard tube 2 and the short tube 28, the folds 23 are expanded and expanded.
The outer peripheral surface of the fluid conduit blocking bag 10 is connected 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 (Fig. 2).

In the perforating device 25 shown in FIG. 7, 32 is a bypass pipe that bypasses the gas between the two perforating devices 25, 25, and 33 is a bypass flow path R.
This is a shutter device that shuts off the

[Another example]

The hard pipe 2 may be a hard synthetic resin pipe other than a steel pipe.

In the embodiment described above, the shape retaining parts 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. The ends of the bag body 1 may be tightened, or both ends of the bag body 1 may be sealed using an adhesive. In this case, the connecting pipe 3 is made of a hard resin pipe. It may be formed by

The flexible short tube 28 may be made of a tube made of 12 nylon, soft vinyl chloride resin, polyethylene resin, rubber, etc., other than a tube made of polyurethane, and may also be made of a tube made of flexible The nylon tube 40 installed inside the short tube 28 may be omitted.

The connecting pipe 3 and the short pipe 28, or the short pipe 28 and the hard pipe 2, may be connected by bonding or band tightening, or by bonding or band tightening, as shown in FIG. They may be integrally connected by a joint fitting 36 or the like that utilizes the locking action of the wedge member 37 as shown in FIG.

Furthermore, in producing the bag body 1, in the above embodiment, a piece of rubberized cloth 21 was wound and glued into a cylindrical shape, but it was formed into a cylindrical shape by extrusion molding. Also good. In this case, since no adhesive portion is formed on the circumferential surface of the bag body 1, the gas sealing properties within the conduit can be improved. In addition, although the bag body 1 is made of rubberized cloth 21 in order to have flexibility and pressure resistance when gas is sealed, it is also possible to use a rubberized cloth 21 made of only a rubber material without embedded base cloth. Elastic synthetic resin materials such as good and flexible polyurethane and polyethylene can be used in place of rubber. moreover,
As the base fabric 20, other than nylon, cotton or other synthetic fibers such as Tetron can also be used.

Furthermore, the first metal cylindrical member 5 and the second metal cylindrical member 6 may be made of aluminum or other metals instead of steel. 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.

The magnet 41 located at the tip of the bag 10 has a smooth spherical tip and is configured to smoothly slide into a predetermined position within the fluid conduit 7 when it comes into contact with the fluid conduit 7. It's okay.

As a means for attaching the magnet 41 to the plug 4, the magnet 41 may be held by fitting other than adhesive, and the plug 4 itself may be attached to the magnet 4.
It may consist of 1.

Furthermore, a first metal cylindrical member 5 in the shape of a cylinder with a bottom is attached to the end of the bag body 1 into which the plug 4 is inserted.
This first metal cylindrical member 5 may be fitted externally.
A magnet 41 may be attached to the tip thereof, or the first metal cylindrical member 5 itself may be made of the magnet 41.

The bag body 1 may be filled with liquid in addition to gas.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

1 to 8 and 11 of the drawings show an embodiment of the 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 the inflated state, Figs. 3 to 5 are perspective views showing the method of manufacturing the bag body, and Fig. 6 is a perforation in the gas conduit. Fig. 7 is a partially cutaway side view of the perforation device attached to the gas pipe, Fig. 8 A, B, and C are explanatory diagrams showing the insertion work, and Fig. 9 is a conventional bag. Fig. 10 is a side view of the conventional bag inserted into the gas conduit.
FIG. 1 is a partial sectional view of a main part of another embodiment of the present invention. 1...Bag body, 23...Folds, 30...Shape retention part, 41...Magnet.

Claims (1)

[Scope of utility model registration request] A first state in which the bag body 1 made of rubber or elastic synthetic resin takes on a cylindrical shape in an inflated state; A shape-retaining portion 30 is provided at each end of the bag body 1 to maintain the wound shape of the folds 23 in a second state in which the folds 23 are wound in a spiral shape. The bag body 1 is sealed at the tip side of the shape retaining portion 30, and a fluid supply/drainage pipe for supplying fluid into the bag body 1 is connected at the rear end side. A fluid conduit blocking bag in which a magnet 41 for removing cutting iron chips is provided in a shape retaining part 30.