JPH02236096A - Join of pipe - Google Patents

Abstract

PURPOSE:To prevent the leakage of fluid from a joined portion by putting an end lining material, for which a frange is integrally provided in the outer periphery of the end of a short pipe in contact with the inner periphery of the end of a pipe, in contact with the inner periphery of the end of the pipe and the front face of the frange to harden impregnated resin. CONSTITUTION:A lined tube 10 on the inner periphery of a pipe 1 comprises a resin impregnated layer of felt or woven fabric and a resin film coating the inner periphery thereof, with thermosetting resin hardened. The tube 10 is cut off at the end of the pipe 1 and the inner periphery of the end is cut into a taper face to weld an end pipe 31 with a frange 32 to the end of the pipe 1. An end lining material 40 comprises a short pipe portion 41 and a frange 42 and is constituted by laminating the resin impregnated layer of felt and the resin film, while the short pipe portion 41 has a taper face 41a of the same thickness as the tube 10. The lining material 40 is put in contact with the inner periphery of the end of the pipe 1 and the frange 32 to thermally harden the thermosetting resin by a heater 33. The above-mentioned constitution permits certain leakage prevention of fluid from the joined portion of the pipe 1 and a joined pipe 22.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for connecting pipes.

[Conventional technology]

As a method of lining the inside of water pipes, sewage pipes, gas pipes, oil transmission pipes, etc., a lining tube is inserted into the pipe with its inner and outer circumferential surfaces turned upside down, and this tube is pre-impregnated with oil. There is a tube reversal type lining method in which the inside of the pipe is lined with the tube by curing the curable resin.

Figures 3 to 5 show the above-mentioned tube inversion lining method, where 1 is a pipe buried underground (existing pipe or newly constructed pipe), 2 is a vertical shaft, and pipe 1 is a vertical shaft. It is separated within 2. 10 is a lined tube inserted into the pipe 1 from the vertical shaft 2.

This lining retube 10 is a sheet material in which a resin-impregnated layer made of felt (nonwoven fabric) or woven fabric, etc., and a resin film that becomes a coating film on the inner circumferential surface when the inner and outer circumferential surfaces of the tube are turned over are laminated. It is molded into a tube shape. This tube 10 is manufactured to a length that corresponds to the length of the lining of the pipe 1 (a length with a slight margin for the pipe length), and the rear end of this tube 10 is designed to prevent water leakage. It is sealed. Further, the lining tube 10 is wound around the reel 3 in a flat and crushed state.
The tube 1 is unrolled from the tube and impregnated with thermosetting resin.
inserted within. To insert the tube 10 into the pipe 1, the tip of the tube 10 is inverted with its inner and outer peripheral surfaces and fixed to the tube retaining ring 4 installed at the upper end of the shaft 2, and then the inverted part of the tube 10 is Pump 5 inside 10a
This is done by pouring water. When water is injected into the inside of the inverted portion 10a of the tube 10, the inverted portion 10a of the tube 10 expands into a cylindrical shape due to water pressure, and the tube 10 forms a folded portion between the non-inverted portion 10b and the inverted portion 10a. It moves forward as it is pushed by the water pressure applied to it, and enters the pipe 1 from the shaft 2 while turning over so that the inner circumferential surface becomes the outer circumferential surface. A guide member 6 is provided in the shaft 2 to guide the inverted portion 10a of the tube 10 into the pipe 1, and the tube 10 descending inside the shaft 2 is guided by this guide member 6. and enter the pipe 1. In addition, the inverted portion 1 of the tube 10 inserted into the tube 1
0a is expanded by water pressure to form a lined pipe. Further, a hot water supply hose 7 is connected to the rear end of the tube 10 as shown in FIG.
0a, and finally inserted over the entire length of tube 1o, which has been inverted and inserted into tube 1, as shown in FIG.

After this, the pump 5 is stopped to stop water injection into the tube 1o, and the rear end of the hot water supply hose 7 is connected to the boiler 8 as shown in FIG. By supplying hot water and injecting this hot water into the water in the tube 10 through the nozzle hole provided in the hot water supply hose 7 to raise the temperature of this water, the heat can be used to increase the temperature of the tube 1o.
The thermosetting resin impregnated with the resin is cured. In addition, in FIG. 5, 7a is a hot water circulation hose that is encased in the hot water supply hose 7 and guided into the water inside the tube 10, and hot water is supplied from the hot water supply hose 7 into the tube 10 through The water is circulated through the boiler 8 through the circulation hose 7a.

When the resin impregnated into the tube 10 in this manner is cured, the tube 1 becomes a two-layered tube whose inner wall surface is lined with the tube 10. After this, after draining the water in the tube 10, cut the folded part at the tip of the tube to separate the hot water supply hose 7 from the tube 10, pull out the hot water supply hose 7, and remove unnecessary parts of the tube 10. (
Cut off the part that protrudes outside of tube 1. In addition, the pipe 1 whose inner circumferential surface has been lined in this way is the pipe 1 of the next section.
After lining the pipe in the same manner as above, pipe 1 of this next section is lined.
and are connected via a connecting pipe.

Note that here, the lining retube 10 is attached to the pipe 1 by water pressure.
Although we have explained the case where the lining tube 10 is inserted into the pipe 1 using air pressure, there is also a tube reversal type lining construction method in which the lining tube 10 is inserted into the pipe 1 using air pressure. The resin impregnated into the tube 10 is cured by heat curing with a steam or photocuring with ultraviolet rays.

By the way, the connection of pipes lined with the above-mentioned lined tube 10 is generally performed by the following method. 6th
The figure is a diagram showing a cross section of a connecting portion of a pipe. A conventional pipe connection method will be explained with reference to the same figure. First, the lining retube 1o is cut at the end of the tube 1. Then, the flange 23 of the connecting pipe 22 having approximately the same diameter as the pipe 1 is joined to the flange 22 provided on the outer periphery of the end of the pipe 1 via the packing 24,
Bolt both flanges 21 and 23. In this way, the lined pipe 1 is connected.

However, when connecting pipes using the above-mentioned connection method, the cut end surface of the lined retube 10 is exposed inside the pipe 1, so the end of the lined pipe 10 is peeled off due to the pressure of the transport fluid flowing inside the pipe 1. There was a problem in that fluid could flow between the pipe 1 and the lining tube 10.

For this reason, it has conventionally been considered to fold the tip of the lining tube 10 that is cut at the end of the pipe 1 onto the front surface of the flange 21 of the pipe 1 and to support it between the flange 21 and the flange 23 of the connecting pipe 22. There is. That is, as shown in FIG. 7, the lining retube 10 is cut to such a length that its end slightly protrudes from the tube 1, and a number of cuts are made around the protrusion of the tube 10, and the protrusion is removed. It is spread out at each cut and folded over the front surface of the flange 21 of the pipe 1, and in this state the flange 21 and the flange 23 of the connecting pipe 22 are joined. According to such a connection method, peeling of the lining tube due to the transport fluid can be effectively prevented.

[Problem to be solved by the invention]

However, even with the pipe connection method shown in FIG. 7, there is a problem in that the transport fluid leaks from between the pipe 1 and the connecting pipe 22. That is, in order to fold the protruding part of the lining tube 10 flatly over the front surface of the flange 21 of the tube 1, the protruding part of the lining tube 10 must be bent and cut close to the base. Therefore, the strength of the cut portion of the lining tube 10 is weakened, and a tear may occur in this portion. As a result, lined tube 1
Pipe 1 and connecting pipe 2 joined across the folded part of 0
A gap is created between the flanges 21 and 23 due to tearing of the cut portion of the tube 10, and the transport fluid leaks from this gap.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a pipe connection that can connect pipes lined with lined retubes without leakage of transport fluid. The purpose is to provide a method.

[Means to solve the problem]

In order to achieve the above object, the pipe connecting method of the present invention connects pipes whose inner circumferential surfaces are lined with a lining retube impregnated with a curable resin via a connecting pipe. is cut on the inner side of the tube from the end of the tube, and the inner peripheral surface of the end of this lined tube is processed into a tapered surface, and then the inner peripheral surface of the end of the tube and the front surface of the flange on the outer periphery of the end of this tube are cut. , an end lining material made of felt or woven fabric, which has a tapered surface overlapping the tapered surface of the lining tube on the outer periphery of one end, and a disk-shaped flange integrally formed on the outer periphery of the other end of the short tube. After impregnating this with a curable resin and bringing them into contact with each other, and curing the impregnated resin of the end lining material, the flange of the connecting pipe and the flange of the pipe are connected to the flange part of the end lining material. It was made to join by sandwiching it.

[Effect]

According to the pipe connecting method of the present invention, the end lining material provided at the end of the pipe lined with the lined tube is placed on the outer periphery of the end of the short pipe portion that is in contact with the inner peripheral surface of the end of the pipe. Since the end lining material is brought into contact with the inner peripheral surface of the end of the tube and the front surface of the flange and the impregnated resin is cured, the inner periphery of the end of the tube is cured. The front surface of the flange can be covered with the end lining material.

Since the flange of the end lining material is in the shape of a disc that touches the entire circumference of the front surface of the flange of the pipe, the strength of this flange is sufficient and there is no possibility of cracks or the like. Since there is no gap between the flanges of the pipe and the joint pipe that are sandwiched and joined, leakage of transport fluid from between the flanges of the pipe and the connecting pipe can be reliably prevented. Moreover, in the present invention, the inner circumferential surface of the end of the lining retube lined on the inner circumferential surface of the pipe is processed into a tapered surface shape, and the outer circumferential surface of the short tube portion of the end lining material is processed into a tapered surface shape. Since the tapered surfaces of these two are overlapped, by curing the impregnated resin of the end lining pipe, the short pipe part of the end lining material can be integrated with the lining tube inside the pipe, and therefore the end lining material Transport fluid will not leak out from the joint between the short pipe section and the lining tube inside the pipe.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained in FIGS. 1 and 2 (
This will be explained with reference to a) and (b). FIG. 1 is a cross-sectional view of a connecting portion of pipes connected by the pipe connecting method according to the present embodiment. The inner peripheral surface of the tube 1 shown in the figure is lined with a lining tube 10. This lining tube 10 is
It consists of a resin-impregnated layer made of felt or woven fabric and a resin film covering the inner peripheral surface of the resin-impregnated layer, and the lined tube is constructed by curing the thermosetting resin impregnated into the resin-impregnated layer. When connecting the pipe 1, first cut the lining retube 10 at the end of the pipe 1,
The inner peripheral surface of the end portion is cut into a tapered surface shape. Next, an end tube 3 having a flange 32 on the outer periphery of the end of the tube 1 is attached.
1 is welded, and an end lining material 40 is attached to the inner peripheral surface of the end of the extended pipe 1 and the front surface of the flange 32 by connecting the end pipe 31.

FIGS. 2(a) and 2(b) are diagrams showing the shape of the end lining shrine, with FIG. 2(a) showing a plan view and FIG. 2(b) showing a sectional view. As shown in the figure, the end lining material 40 is formed integrally with a short tube section 41 that is lined with the inner peripheral surface of the end of the tube 1 including the end tube 31, and an outer circumference of the end of this short tube section 41. A disc-shaped flange 4 that is in contact with the front surface of the flange 32 of the pipe
It has a shape consisting of 2. This end lining material 40
has a laminated structure of a resin-impregnated layer made of felt molded into the above shape and a resin film covering the inner peripheral surface of the short tube portion and the front surface of the flange. The short tube part 41 of the end lining material 40 has the same thickness as the lining tube 10, and the outer circumferential surface of the end thereof has a taper 41a that overlaps the tapered surface formed on the inner circumferential surface of the end of the lining tube 10. is formed.

After this end lining material 40 is brought into contact with the inner circumferential surface of the end of the pipe 1 and the flange 32 thereof, two parts are placed opposite the rear surface of the flange 31 and the outer circumferential surface of the end of the pipe 1 as shown by the two-dot chain line in the figure. A split-type annular heating body 33 is installed, and the heat of this heating body 33 thermosets the thermosetting resin impregnated in the resin-impregnated layer of the end lining shrine 40.

Once the thermosetting resin impregnated in the end lining material 40 is thermoset, the pipe 1 is then inserted between the flange portion 42 of the end lining material 40 and the annular packing 34 installed on the front surface thereof. The flange 31 and the flange 23 of the connecting pipe 22 are bolted together.

In the above manner, a pipe 1 having a lined pipe ] 0 is formed.
connection is terminated.

According to such a pipe connection method, the lining tube 10
An end lining material 40 is provided at the end of the pipe 1 lined with 1, and a disk-shaped flange 42 is integrally provided on the outer periphery of the end of the short pipe section 41 that is in contact with the inner peripheral surface of the end of the pipe 1. Therefore, if this end lining material 40 is brought into contact with the inner circumferential surface of the end of the tube 1 and the front surface of the flange 32 and the impregnated resin is thermally cured, the front surface of the flange 32 will be removed from the inner circumferential surface of the end of the tube 1. It can be covered with the end lining material 40 described above. Since the flange 42 of the end lining 40 is in the shape of a disc that touches the entire front surface of the flange 32 of the tube 1, the strength of the flange 42 is sufficient and no cracks or the like will occur. Since there is no gap between the flanges of the pipe 1 and the joint pipe 22 which are joined with the flange 42 in between, leakage of transport fluid from the joint between the pipe 1 and the connecting pipe 22 can be reliably prevented. Moreover, in this embodiment, the inner circumferential surface of the end of the lined tube 10 lined on the inner circumferential surface of the pipe 1 is processed into a tapered surface shape, and the outer circumferential surface of the short tube section 41 of the end lining material 40 is formed into a tapered surface. Since the tapered surfaces of both are overlapped as 41a, the end lining material 40
The end lining material 40 is formed by curing the impregnated resin of
The short tube section 41 of the end lining material 40 can be integrated with the lining tube 10 in the tube 1, so that the transport fluid does not leak out from the joint between the short tube section 41 of the end lining material 40 and the lining tube 10 in the tube. Nor.

In the above embodiment, the thermosetting resin impregnated into the resin-impregnated layer is cured by heating from the outside of the tube 1, but it may be heated from the inside of the tube 1. Further, a photocurable resin may be used instead of a thermosetting resin. Furthermore, a woven fabric may be used as the resin-impregnated layer of the end lining material 40.

〔Effect of the invention〕

As described in detail above, according to the present invention, the end lining material provided at the end of the pipe lined with the lining retube is applied circularly to the outer periphery of the end of the short pipe portion that is in contact with the inner peripheral surface of the end of the pipe. A plate-shaped flange is integrally provided, and the end lining material is brought into contact with the inner peripheral surface of the end of the tube and the front surface of the flange to harden the impregnated resin, so that the inner peripheral surface of the end of the tube is connected to the front surface of the flange. The above end can be covered with a lining moon. Since the flange of the end lining is in the shape of a disc that touches the entire circumference of the front surface of the pipe flange, the strength of this flange is sufficient and there is no possibility of cracking, and the flange is joined by sandwiching the flange. Since there is no gap between the flanges of the connected pipe and the connecting pipe, it is possible to reliably prevent the transport fluid from leaking from the joint between the pipe and the connecting pipe. Moreover, in the present invention, the inner circumferential surface of the end of the lined tube lined on the inner circumferential surface of the pipe is processed into a tapered surface shape, and the outer circumferential surface of the short tube part of the end lining material is formed into a tapered surface to form a tapered surface. - Since the pipe surfaces are overlapped, the short pipe part of the end lining can be integrated with the lining tube inside the pipe by curing the impregnated resin of the end lining material. It is possible to reliably prevent transport fluid from leaking from the joint between the short pipe section and the lining tube inside the pipe.

[Brief explanation of drawings]

FIG. 1 and FIGS. 2(a) and 2(b) are diagrams showing an embodiment of the present invention, FIG. 1 is a sectional view of a pipe connected by the pipe connecting method according to the embodiment, and FIG. (a) is a plan view of the end-lined shrine, (b) is a sectional view of the end-lined shrine, Figures 3 to 5 are diagrams for explaining the inverted lining method, and Figure 6 is the conventional method. FIG. 7 is a diagram for explaining another conventional method, and is a plan view of the end of the connecting tube. 10... Lining tube, 22... Connection pipe, 23.
...Connecting pipe side flange, 31... End pipe, 32...
Pipe flange, 40... End lining material, 41... Short pipe portion, 42... Flange. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] In a method of connecting pipes whose inner peripheral surfaces are lined with a lining tube impregnated with a curable resin via a connecting pipe, the lining tube inside the pipe is cut from the end of the pipe inside the pipe, and the lining tube is After processing the inner peripheral surface of the end into a tapered surface shape, a tapered surface that overlaps the tapered surface of the lining tube is formed on the outer peripheral surface of one end on the inner peripheral surface of the end of the tube and the front surface of the flange on the outer periphery of the end of this tube. An end lining material made of felt or woven fabric with a disk-shaped flange integrally provided on the outer periphery of the other end of the formed short pipe is impregnated with a curable resin and brought into contact with the end lining material. A method for connecting pipes, comprising: curing the impregnated resin of the lining material, and then joining the flange of the connecting pipe and the flange of the pipe with the flange portion of the end lining material interposed therebetween.