JP2001173872A - Packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration in a sealing property by providing a reinforcing means inside a packing. SOLUTION: A packing main body to be installed in an external body is provided so as to seal a clearance formed between an existing pipe for flowing the fluid and the external body to be fitted on the existing pipe freely to be removed. The packing main body is provided with a fitting part to be fitted in a fitting groove formed in the external body and a pushing part projected from the fitting groove so as to be brought in contact with a surface of the existing pipe. A reinforcing means harder than the packing main body can be provided inside the packing main body over from the fitting part to the pushing part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket used in a non-water cutting device for cutting an existing pipe without cutting water.

[0002]

2. Description of the Related Art Conventionally, there is a well-known method of inserting a non-stop water valve in which an existing pipe is pierced with water without interruption and a gate valve body is inserted into a pierced portion in order to close the existing pipe. In such a method of inserting a valve for continuous water supply, a continuous water supply device is used so that water does not leak outside from an existing pipe buried underground.

[0003] As shown in FIG. 8A, the water suspension device includes an exterior body 51 composed of a plurality of divided bodies 50 and an exterior body 5.
1 and a cutting tool and a valve element (not shown) provided at different positions in the circumferential direction. The inner peripheral surface of each of the divided bodies 50 secures watertightness with the existing pipe 54. For this purpose, a packing 52 is attached. The packing 5
2 includes a fitting portion 52a fitted into the fitted groove 50a formed in each of the divided bodies 50, and a pressing portion 52b projecting from the fitted groove 50a and coming into contact with the surface of the existing pipe 54. .

[0004] Then, the exterior body 51 is externally fitted to a part of the existing pipe 54, and the cutting tool attached to the exterior body 51 is rotated together with the exterior body 51 in the circumferential direction of the existing pipe 54, so that the existing pipe 54 is rotated. A cutting port is formed in the circumferential direction of the pipe 54, and the valve body is inserted into the cutting port to close the cutting port and block fluid flowing through the existing pipe.

[0005]

The sealing between the inner peripheral surface of the exterior body 51 and the outer peripheral surface of the existing pipe 54 is ensured by the packing 52. However, for example,
When the outer body 51 for a cast iron pipe is used for a steel pipe as an existing pipe (several millimeters smaller in diameter than the cast iron pipe) at the construction site, the inner peripheral surface of the outer body 51 and the outer peripheral surface of the existing pipe 54 are used. And the gap S between them increases.

Therefore, water leakage from the cutting opening of the existing pipe 54 is caused by the pressure as shown in FIG.
Since b is pressed outward and bent, or the packing 52 is removed from the fitted groove 50a of the exterior body, there is a disadvantage that the sealing performance is poor.

[0007] In view of the above problems, it is an object of the present invention to provide a reinforcing means inside the packing to prevent the sealing performance from being deteriorated.

[0008]

According to a first aspect of the present invention, there is provided a packing comprising: an existing pipe through which a fluid flows; and an exterior body detachably fitted to the existing pipe. A sealing body attached to the outer body to seal a gap formed between the outer body and the packing body; a fitting portion fitted into a fitting groove formed in the outer body; A pressing portion that protrudes from the fitting groove and comes into contact with the surface of the existing pipe, and a reinforcing means harder than the packing body is provided in the packing body over the fitting portion and the pressing portion. It is in.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, in FIGS. 1 and 4 to 6 showing the schematic configuration of the first embodiment, 1
Is an uninterrupted water supply, for example, an existing pipe 2 buried underground.
Is provided with an exterior body 3 fitted to a part of the exterior body. The exterior body 3
Is composed of a first divided body 4 and a second divided body 5. A valve cover 5A is attached to the second divided body 5, and a gate valve 23 is housed in the valve cover 5A so as to be able to move up and down.

The second divided body 5 is provided with a protruding branch portion 5B through which the cutting tool 19 penetrates, and a discharge hole (not shown) for discharging chips and water when cutting the existing pipe 2 together with water. Is provided.

An opening / closing valve (work valve) (not shown) and a cutting machine 9 are attached to the branch portion 5B. The cutting machine 9 is for forming a semi-annular cutting port 17 on the upper part of the existing pipe 2 and includes a cutting tool 19.
Is sent in the radial direction of the existing pipe 2, and the cutting tool 19 is rotated by the rotational force of a motor such as a motor or an engine,
Cause a cutting motion. The structure of the cutting machine 9 is similar to that of a well-known hole saw type non-water drilling machine, and a detailed illustration and description thereof will be omitted.

A packing groove 6a as a semi-circular groove to be fitted is formed on both sides in the longitudinal direction of the tube axis of the inner peripheral surfaces of the two divided bodies 4 and 5.
Are formed, and linear packing grooves 6b are formed on both side edges of the inner peripheral surface. A plurality of flanges 6c protrude from both sides of both divided bodies 4 and 5,
Bolts B are inserted into the insertion holes of the flanges 6c, nuts N are screwed into the bolts B, and the divided bodies 4 and 5 can be attached to the existing pipe 2.

As shown in FIGS. 1 and 2, reference numeral 7 denotes a packing made of rubber or the like which is mounted on both of the divided bodies 4 and 5. The packing 7 is fitted and mounted in the semi-annular packing groove 6a. And a pair of connecting bodies 9 connected between the two arc-shaped bodies 8 and fitted in the linear packing groove 6b to form a frame. .

Each of the arc-shaped members 8 has a fitting portion 8a fitted into the semi-annular packing groove 6a, and a pressing portion 8b protruding from the packing groove 6a and coming into contact with the surface of the existing pipe 2. I have.

A reinforcing means 15 as a long core is continuously or intermittently embedded in the arc-shaped body 8 in the longitudinal direction thereof. Such reinforcing means 15
It is made of a material harder than the packing body (for example, a hard rubber material, a synthetic resin, or a metal). The cross-sectional shape of the reinforcing means 15 may be any shape such as a circular shape and an elliptical shape.

The fitting portion 8a of the arc-shaped body 8 of the packing body 14
When fitted into the semi-annular packing groove 6a, the pressing portion 8b protrudes from the tip (inner peripheral surface) of the receiving portion 20 constituting the semi-annular packing groove 6a of the exterior body 3. I have.
More specifically, as shown in FIG. 3A, the inner diameter D1 of the arc-shaped body 8 (the pressing portion 8b) is smaller than the inner diameter D2 of the receiving portion 20. Moreover, the inner diameter D3 of the reinforcing means 15 is set smaller than the inner diameter D2 of the receiving portion 20, and the reinforcing means 1
5 is set larger than the inner diameter D2 of the receiving portion. Therefore, the reinforcing means 15 is provided over (across) the fitting portion 8a fitted into the packing groove 6a of the arc-shaped body 8 and the pressing portion 8b.

The inner diameter D1 of the arc-shaped body 8 is set smaller than the outer diameter D5 of the existing pipe 2. Further, a slight gap S is formed between the inner peripheral surfaces of the two divided bodies 4 and 5 and the outer peripheral surface 2a of the existing pipe 2.

Next, the procedure of the water stopping method will be described.
First, with the fluid (water) flowing in the existing pipe 2, the first divided body 4 and the second divided body 5 of the exterior body 3 are attached to the existing pipe 2 by the bolts B and the nuts N.

At this time, the pressing portion 8b of the arc-shaped body 8 of the packing body 14 fitted into the semi-annular packing groove 6a by the fastening force of each bolt B makes the surface (outer peripheral surface) 2a of the existing pipe 2
At the same time, the connecting bodies 9 fitted into the linear packing grooves 6b are pressed against each other, so that the entire periphery of the packing 7 is stopped, and the inner surface of the exterior body 3 is reliably stopped.

In this case, the pressing portion 8b is pressed against the outer peripheral surface 2a of the existing pipe 2, but the packing 7 is formed in a frame shape by the arc-shaped body 8 and the connecting body 9, and the pressing portion 8b is provided at the tip end. Since it has a curved surface, the frictional force with the outer peripheral surface of the existing pipe 2 is small, and the outer body 3 can be rotated without hindrance in a state where water is stopped.

Next, the exterior body 3 is rotated, and the cutting tool 1 is rotated.
After setting the cutting position by 9, the cutting tool is rotated and moved in the radial direction of the existing pipe 2, and a part of the existing pipe 2 is cut and penetrated.

After that, the exterior body 3 is moved in the circumferential direction of the existing pipe 2
For example, it is rotated from about 150 degrees to 160 degrees. That is, the cutting tool 19 is rotated from the cutting start position to the cutting end position, and the cutting port 17 is formed in a part (upper part) of the existing pipe 2. In addition, the cutting chips at the time of cutting are discharged together with the water from the drainage channel of the branch portion 14 due to the water pressure overflowing from the cutting port 17.

Further, the water that is not discharged fills the inside of the exterior body 3, and the water pressure presses the pressing portion 8b of the packing 7 outward as shown in FIG. This water pressure presses the packing arc-shaped body 8 toward the receiving portion 20 and tries to curve the pressing portion 8b protruding from the receiving portion 20, but the reinforcing means 15 embedded in the arc-shaped body 8 Since it extends over the fitting portion 8a and the pressing portion 8b, even if the gap S is slightly large, the pressing portion 8b is prevented from bending outward, and the pressing portion 13 is hard to bend. There is no possibility that the fitting portion may come off the packing groove 6a, and the sealing performance is not deteriorated.

After the formation of the cutting port 17, the cutting tool 1
9 is retracted, the valve is closed, and after the valve is closed, the cutting tool 19 is removed. After that, the outer body 3 is rotated, and the cutting port 17 is closed by inserting the gate valve body 23 into the cutting port 17,
Water can be stopped in the existing pipe 2.

The present invention is not limited to the above embodiment, and the sectional shape of the reinforcing means is not particularly limited as shown in FIG. Also, the reinforcing means 15
May be provided flush with one surface of the arc-shaped body 8 (the surface in contact with the receiving portion), in addition to being completely embedded in the packing body 14.

Further, the divided body of the exterior body 3 is divided into two in the circumferential direction, but the invention is not limited to this, and it may be divided into a plurality.

The present invention is applicable not only to water pipes but also to gas pipes and the like. That is, the fluid flowing through the existing pipe 2 is not limited to water but may be any other fluid such as gas or oil, which is included in the scope of the present invention.

[0028]

As described above, according to the packing of the present invention, the gap formed between the existing pipe through which the fluid flows and the outer body detachably fitted to the existing pipe is provided. To provide a seal, a packing body attached to the outer body is provided,
The packing body includes a fitting portion fitted into the fitted groove formed in the outer body, and a pressing portion protruding from the fitted groove and coming into contact with the surface of the existing pipe. Since the reinforcing means harder than the packing body is provided over the fitting portion and the pressing portion, even if the gap formed between the existing pipe and the outer body is slightly larger, It is possible to prevent the pressing portion from being bent by the fluid pressure, and it is possible to maintain good watertightness in, for example, uninterrupted work for stopping water.

As described above, even when the diameters of the existing pipes are slightly different, since the same packing can be used, there is an advantage that the versatility is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a water suspension device according to an embodiment of the present invention.

FIG. 2 is a perspective view including a partial cross section of the packing.

FIG. 3A is a cross-sectional view showing a main part in a state where a packing is mounted on an exterior body, and FIG. 3B is a cross-sectional view showing a main part in a state sealed with the packing.

FIG. 4 is a cross-sectional front view showing a state where the exterior body is attached to an existing pipe.

FIG. 5 is a sectional side view of the same.

FIG. 6 is a cross-sectional front view showing a state where a cutting device is attached to the exterior body.

FIGS. 7A to 7D are cross-sectional views showing another embodiment of the present invention.

8A and 8B show a conventional example, in which FIG. 8A is a cross-sectional front view showing a state in which an exterior body is attached to an existing pipe, and FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water-stop device, 2 ... Existing pipe, 3 ... Outer body, 4 ... First divided body, 5 ... Second divided body, 7 ... Packing, 8 ... Arc-shaped body, 8
a: fitting portion, 8b: pressing portion, 9: connecting body, 15: reinforcing means

Claims (2)

[Claims] 1. A packing body attached to an exterior pipe for sealing a gap formed between an existing pipe through which a fluid flows and an exterior body detachably fitted to the existing pipe. The packing body comprises: a fitting portion fitted into a fitted groove formed in the exterior body; and a pressing portion protruding from the fitted groove and in contact with the surface of the existing pipe. A packing, wherein a reinforcing means harder than the packing body is provided in the main body over the fitting portion and the pressing portion. 2. The exterior body is divided into at least two parts,
2. The packing according to claim 1, wherein the packing is mounted on the inner peripheral surface of each of the divided bodies.