JPH0229920B2 - KATOSEIRAININGUHOOSUNYORIHOSHUSARERUKANNOTANBUSHORIHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating the ends of pipes, such as water pipes, sewer pipes, gas pipes, etc., to be repaired with a flexible lined hose.

Conventionally, when repairing water pipes, sewer pipes, gas pipes, etc. by attaching a flexible lining hose to the inner peripheral surface, the pipe at one end in the front and back direction of the area to be repaired was cut and removed to an appropriate length and lined. A working space is formed for attaching the hose, as shown in Figure 4.
After the lining hose 1 is attached to the inner peripheral surface of the pipe 2, the end of the lining hose 1 is cut at a point slightly inside the end of the pipe 2, and the end of the lining hose 1 is cut into the lining hose 1. The lining hose 1 is covered with a sealing material 16 having a U-shaped cross section and having an annular portion attached between the outer circumferential surface and the inner circumferential surface of the pipe 2 and an annular portion abutted against the inner circumferential surface of the lining hose 1. , a fixed ring 1 is attached to the inner peripheral surface of this annular sealing material 16.
7 and presses and fixes the annular sealing material 16 to the inner circumferential surface of the pipe 2, preventing the lining hose end from peeling off from the inner circumferential surface of the pipe and transporting fluid (such as water or water) between the lining hose 1 and the pipe 2. In order to prevent the intrusion of water (sewage, gas, etc.), this pipe 2 and the joint pipe 5, which will be newly installed at the location where the pipe was removed to create a work space for installing the lining hose, are Since the pipes 2 and 5 were connected via a joint pipe 3' having an inner diameter larger than the outer diameter, the shape of the inner circumferential surface formed between the pipe 2 and the joint pipe 5 was similar to that of the fixed ring 17. It has a complicated shape that protrudes toward the tube axis at the attachment point, and enters into the inner peripheral surface of the coupling tube 3' at a location between the end surface of the tube 2 and the end surface of the coupling tube 5.
This results in an increase in pressure drop and resistance during fluid transportation, and if the fluid to be transported is sewage that often contains solids, the solids may get caught on the protruding fixed ring 17 and clog the pipe. This is likely to occur, and furthermore, there is a risk that the fixed ring 17 may come off and the lining hose 1 may peel off during long-term use.

In addition, in order to accurately cover the edge of the lining hose with the annular sealing material 16 to prevent the lining hose 1 from peeling off and the transport fluid from entering between the lining hose 1 and the pipe 2 over a long period of time, It is necessary to accurately cut the end of the lining hose 1 along the circumferential direction, which has the disadvantage that the cutting operation is time-consuming.

Among these drawbacks, pressure loss and resistance are caused by the shape of the inner circumferential surface of the tube being such that it enters the inner circumferential surface of the coupling tube 3' at a location between the end surface of the tube 2 and the end surface of the coupling tube 5. Regarding the increase in the number of joint pipes 5
This can be solved by accurately finishing the end face of the pipe 2 that faces the end face of the pipe 2, but finishing with such precision at a construction site where the pipe 2 is already installed requires a lot of equipment and a lot of effort. However, it is difficult in practice.

The present invention has been made in view of the above-mentioned circumstances, and by devising a method for attaching a flexible lining hose, it is possible to install a lining hose without using the conventional annular sealing material or fixed ring. It prevents peeling of the lining hose and the intrusion of transportation fluid between the lining hose and the pipe, and also minimizes pressure loss and increase in resistance at the connection between the pipe and the fitting pipe, and has excellent workability. It is an object of the present invention to provide a method for treating the end of a pipe repaired with a flexible lined hose.

The characteristic configuration of the method for treating the end of a pipe repaired by a flexible lined hose according to the present invention in order to achieve the above object is as follows: , a step of concentrically connecting diameter-expanding deformable guide tubes each having a tapered inner circumferential surface whose inner diameter increases as the distance from the end of the tube increases;

(b) The ends of the flexible lining hoses are folded back toward the outer circumferential surface and installed in the pipe, and pressure fluid is supplied between the outer circumferential surfaces of the flexible lining hoses that are positioned facing each other across the folded portions. , invert the flexible lining hose to a position where its inner circumferential surface faces the inner circumferential surface of the tube, and align the inner circumferential surface of the flexible lining hose with the inner circumferential surface of the tube and the diameter expansion deformation guide tube. The process of expanding the diameter and adhering it to the tapered inner circumferential surface of.

(c) sandwiching the flexible lining hose and pressing a coupling tube having an inner diameter larger than the inner diameter of the lining hose portion located inside the tube onto the tapered inner circumferential surface of the diameter expansion deformation guide tube; The process of fixing concentrically.

It has the steps (a) to (c) above, and this configuration provides the following effects.

That is, by the step (a), the end of the tube is shaped into a substantially tangled shape.

Next, in step (b) above, the outer circumferential surface of the lining hose is reversed by the pressure of the pressure fluid to a position facing the tube axis, and the lining hose is installed across the tube and the diameter expansion deformation guide tube. At this time, the lining hose is expanded in diameter by the pressure of the pressure fluid and is bonded to the tapered inner circumferential surface of the diameter expansion deformation guide tube.

Then, in the step (c), the end portion of the lining hose is sandwiched between the diameter expansion deformation guide tube and the coupling tube, and is strongly fixed.

Therefore, without using a conventional annular sealing material or a fixed ring, it is possible to reliably prevent the lining hose from peeling off and the transportation fluid from entering between the lining hose and the pipe and the diameter-expanding deformation guide pipe. This solves the problem of clogging caused by the use of an annular sealing material or fixed ring, and peeling of the lining hose caused by the fixed ring being easy to come off.

In addition, since the end of the lining hose is clamped and fixed between the joint pipe and the diameter expansion guide pipe, the end of the lining hose can be easily processed, and the workability is excellent. The circumferential surface and the inner circumferential surface of the joint pipe can be connected relatively smoothly, and increases in pressure loss and resistance of the transport fluid can be suppressed as much as possible.

Hereinafter, implementation sequences of the method of the present invention will be explained based on the drawings.

As shown in FIGS. 1 and 2, at the end of the tube 2,
A flexible lining hose is created by connecting a diameter-expanding deformable guide tube 3 having a tapered inner circumferential surface 3A whose minimum inner diameter is approximately the same as the inner diameter of the tube 2 and whose inner diameter increases as the distance from the end of the tube 2 increases. Pressurized supply of air from one end side between the outer circumferential surfaces of flexible lining hoses 1, which are placed in the tube 2 with the end portions of the hoses 1 folded back toward the outer circumferential surfaces, and are positioned facing each other across the folded portions. and pulling the flexible lining hose 1 to the other end via rope a, the flexible lining hose 1 is reversely moved from the back state where the adhesive 1a is applied to the inner peripheral surface to the front state where the adhesive coated surface is outside. The inner circumferential surface of the tube 2 and the guide tube 3 are
The flexible lining hose 1 is bonded across the tapered inner circumferential surface 3A of the pipe 2 to repair the pipe 2.

The lining hose 1 is bonded to the tapered inner circumferential surface 3A by being expanded and deformed into a tapered shape in which the diameter gradually increases toward the outside by supplying the air under pressure. .

As shown in FIG. 2, the guide tube 3 has a coupling tube 5 with another tube 4 having an inner diameter larger than the inner diameter of the hose 1 portion located inside the tube 2. The lining hose end portion 1A is fixedly pressed against the tapered inner circumferential surface 3A by the tapered outer circumferential surface 5A on one end side which is parallel to the tapered inner circumferential surface 3A.

One specific structure of the lining hose 1 is a structure consisting of a polyester cloth layer that forms an adhesive surface to the inner peripheral surface of the pipe, and a polymerized polyethylene waterproof sheet layer on the inner peripheral surface of this cloth layer. be able to.

The guide tube 3 is constructed by moving the flange 3a of the guide tube 3 and an annular body 6 axially opposed thereto relatively close to each other by tightening bolts 7.
annular sealing material 8 interposed between a and the circular body 6;
The annular sealing material 8 is attached to the tube 2 with a frictional force against the outer circumferential surface of the tube 2 by deforming the annular sealing material 8 so as to come into pressure contact with the outer circumferential surface of the tube 2 .

The coupling pipe 5 has its flange 5a and the flange 3b of the guide pipe 3 moved relatively close to each other by tightening the bolts 9, so that the hose end portion 1A is connected to the tapered inner and outer circumferential surfaces 3A and 5A. It is inserted and fixed into the guide tube 3 in a pinched state.

Reference numeral 10 denotes a joint pipe for connecting the joint pipe 5 and another pipe 4, and means for attaching the joint pipe 10 to the joint pipe 5 and the other pipe 4 is the joint pipe 1.
By tightening the bolts 12, 12', the flanges 10a, 10a' at both axial ends of the flange 10a' and the annular bodies 11, 11' disposed axially opposite the flanges 10a, 10a' are moved relatively close to each other by tightening the bolts 12, 12'. , 10a' and the annular bodies 11, 11'.
3 and 13' are respectively deformed so as to come into pressure contact with the outer peripheral surfaces of the joint pipe 5 and the other pipe 4, so that the frictional force of the annular sealing material 13 and 13' against the outer peripheral surfaces of the pipes 5 and 4 can be applied to both pipes. It is attached to 5 and 4. 14 is
This is a hose withdrawal limiter when the hose 1 is introduced into the pipe 2, and is attached to the guide pipe 3.

Next, to briefly explain the construction capacity, after installing the hose 1 in the pipe 2 with the guide pipe 3 attached to the pipe 2, the hose withdrawal limiter 14 is removed from the guide pipe 3, and the hose 1 is inserted into the guide pipe 2. After that, the fitting tube 5 is inserted and fixed into the guide tube 3, and the tangled end portion 1A of the hose 1 is pressed against the tapered inner circumferential surface 3A of the guide tube 3 and fixed.

According to the configuration of the above embodiment, the joint pipe 5
Since the outer circumferential surface 5A that presses and fixes the lug-shaped end portion 1A to the tapered inner circumferential surface 3A of the guide tube 3 is tapered, by inserting the coupling tube 5 into the guide tube 3, This allows the end portion 1A to be fixed.

FIG. 3 shows another embodiment, in which an O-ring 15 is provided on the tapered outer circumferential surface 5A of the coupling tube 5 to improve sealing performance.

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 drawings]

The drawings show an embodiment of the method for treating the end of a pipe repaired by a flexible lining hose according to the present invention, and FIG. 1 is a longitudinal cross-sectional view showing the construction procedure of the lining hose, and FIG. 2 is a longitudinal cross-section of the main part. It is a diagram. Third
The figure is an enlarged vertical cross-sectional view of the main part showing another embodiment, and FIG. 4 is a vertical cross-sectional view of the main part showing a conventional example. 1...Flexible lining hose, 2...Pipe, 3
...Diameter expansion deformation guide tube, 5...Coupling pipe, 3A...
Tapered inner peripheral surface, 5A...pressing surface, 15...O
ring.

Claims (1)

[Scope of Claims] 1. A method for treating the end of a pipe repaired with a flexible lining hose, which includes the following steps (a) to (c). (a) A diameter-expanding deformation guide tube 3 provided at the end of the tube 2 with a tapered inner circumferential surface 3A whose minimum inner diameter is approximately the same as the inner diameter of the tube 2 and whose inner diameter increases as the distance from the end of the tube 2 increases. The process of connecting concentrically. (b) The ends of the flexible lining hoses 1 are folded back toward the outer circumferential surface and installed in the tube 2, and pressure fluid is applied between the outer circumferential surfaces of the flexible lining hoses 1 that are positioned facing each other with the folded portions in between. by supplying
The flexible lining hose 1 is turned over so that its inner circumferential surface faces the inner circumferential surface of the tube 2, and the inner circumferential surface of the flexible lining hose 1 is aligned with the inner circumferential surface of the tube 2.
and the tapered inner circumferential surface 3A of the diameter-expanding deformation guide tube 3. (c) On the tapered inner circumferential surface 3A of the diameter expansion deformation guide tube 3 with the flexible lining hose 1 in between,
A step of pressing and concentrically fixing the coupling pipe 5 having an inner diameter larger than the inner diameter of the flexible lining hose 1 portion located inside the pipe 2. 2. End treatment of a pipe repaired by a flexible lining hose according to claim 1, wherein an O-ring 15 is provided on a pressing surface 5A of the coupling pipe 5 against the tapered inner circumferential surface 3A. Method. 3 The pressing surface 5A of the joint pipe 5 against the tapered inner circumferential surface 3A is the tapered inner circumferential surface 3A.
A method for treating the end of a pipe repaired by a flexible lining hose according to claim 1 or 2, which is formed in a tapered shape parallel or substantially parallel to the lining hose.