JP3048331B2 - Reversing jig used for rehabilitation repair method of existing piping - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing jig used for a reversing lining method for maintenance of an existing pipe such as a gas pipe.

[0002]

2. Description of the Related Art Various techniques have been developed and proposed for a technique for rehabilitating and repairing existing pipes without digging while laying the existing pipes. For example, there is known a lining method in which a flexible tube is drawn into a tube and attached to the inner surface of the tube. At present, this method has already been put to practical use as an effective repair technique for aging existing pipelines.

[0003] As one of the lining methods, an inverted lining method is also applied. In the inverted lining lining method, a flexible lining tube having an outer diameter substantially equal to the inner diameter of the pipe and in which an adhesive is sealed is introduced into the existing pipe while inverting the inner surface to the outer surface. The lining tube is reverse-adhered to the inner surface of the existing pipe with an adhesive.

[0004] Specifically, an adhesive is first sealed in a flexible lining tube in advance, and one end of the lining tube is folded back and fixed in an annular shape to one end of an existing pipe. Then, a fluid pressure is applied to the formed folded portion so as to press from the rear portion to the other end of the conduit, and the lining tube is inverted and introduced into the tube so that the inner surface becomes the outer surface. In this manner, the folded portion is gradually advanced from one end to the other end of the pipe along the inside of the pipe, and the lined tube is pressed against the inner surface of the pipe by the fluid pressure and the adhesive over the entire length of the existing pipe.

[0005] Finally, by circulating a heating fluid (liquid) in the inverted lining tube to promote the curing of the adhesive, the lining tube is securely bonded to the inner surface of the existing pipe.

[0006]

However, the above-mentioned conventional method has the following problems.

[0007] That is, the lining tube is composed of a plastic layer and a fiber layer, and after being reversely introduced into the existing pipeline, the plastic layer becomes the inner surface of the tube and the fiber layer becomes the outer surface of the tube. Since a liquid fluid is used during the above operation, such a liquid fluid tends to penetrate into the fiber layer, and flows between the outer surface of the tube and the inner surface of the existing pipe along the fiber layer. It has become.

In the above-described reversing lining construction, no measures are taken to release the liquid fluid that has entered the fiber layer of the lining tube after the reversal, so that the liquid fluid that has entered the fiber layer of the tube remains in the fiber layer as it is. become. Therefore, there is a possibility that the adhesive between the outer surface of the lining tube and the inner surface of the existing pipeline may not be able to bond between the outer surface of the lining tube and the inner surface of the existing pipeline due to the influence of the liquid fluid that has entered the fiber layer. is there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is used for the construction of an inverted pipe lining of an existing pipe, and the liquid that has entered the fiber layer of the lining tube after the drain is discharged to the outside. It is an object of the present invention to provide a reversing jig configured so as to be able to do so.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is directed to a method of reversing a flexible lining tube in a pipeline from one end opening of an existing pipeline buried underground. Introducing the reversing jig used in the existing pipe rehabilitation repair method of introducing and curing the adhesive interposed between the tube and the pipe inner wall surface and attaching the tube to the pipe inner surface, A substantially cylindrical jig body attached to one end of the conduit and having a plurality of through holes in a circumferential wall surface; and a substantially cylindrical jig reinforcing member fitted to an inner peripheral surface of a rear end portion of the jig body. A ring member attached to the inner peripheral surface of the jig reinforcing member and holding one end of the lining tube between the jig reinforcing member and fixing the one end of the lining tube and the ring member in the jig reinforcing member. A cover member attached to the outside of the jig reinforcing member so as to And wherein the Rukoto.

Further, in the present invention, the jig main body is formed of a plastic material to which resin does not easily adhere, and the jig reinforcing member and the cover member are formed of a metal material having required strength. Is another feature.

Further, the present invention is characterized in that the jig body is formed of polyethylene, Teflon (registered trademark) or Duracon (registered trademark).

Further, the present invention is characterized in that the cover member is screwed to the outside of the jig reinforcing member.

Further, the present invention is characterized in that the ring member is made of a material having elasticity, and the wall portion of the ring member is tapered.

[0015]

According to the present invention constructed as described above, when the lining tube is introduced into the pipe while being inverted, the reversing jig is attached to one end of the existing pipe. The reversing jig includes a jig body attached to one end of the pipe, a jig reinforcing member attached to one end of the jig body, and a jig reinforcing member attached to the jig reinforcing member to stop one end of the lining tube. And a cover member attached to the outside of the jig reinforcing member so that one end of the lining tube and the ring member are fixed in the jig reinforcing member. Since the jig body has a cylindrical shape and is formed with a plurality of through holes in the wall portion, the liquid fluid that has entered the fiber layer of the lining tube which is the outer surface after the inversion in the pipe is introduced. Since the water can be discharged to the outside through these through holes, the adhesion between the outer surface of the lining tube and the inner surface of the tube is of high quality.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an exploded view of a reversing jig according to the present invention. As shown in FIG. 1, a reversing jig according to the present invention includes a jig main body 1 mounted on one end of a pipe, a jig reinforcing member 10 mounted on one end of the jig main body 1, and one end of a lining tube. A ring member 11 mounted in the jig reinforcing member 10 so as to stop the
And a cover member 15 attached to the outside of the jig reinforcing member 10 so as to be fixed in the jig reinforcing member 10.

The jig body 1 is made of a plastic material having a certain degree of strength and to which resin does not easily adhere, such as polyethylene or Teflon (registered trademark) or Duracon (registered trademark). Made of material. The jig body 1 has a cylindrical shape having a flange portion 3 on its outer peripheral surface, but has a relatively thin wall portion 1a and a relatively thick wall portion 1b. The inner diameter d1 is larger than the inner diameter d2. A plurality of through-holes 2 are formed in the wall 1b, and the through-holes 2 allow the liquid fluid that has entered the fiber layer of the lining tube to be described later to be discharged from the fiber layer. Further, a ring-shaped sealing material 4 is provided on the inner surface of the wall 1b, and a plurality of screw holes 5 are formed through the wall 1b.

The jig reinforcing member 10 is made of a metal material having a required strength, for example, brass. The jig reinforcing member 10 has a relatively thin wall 10a and a relatively thick wall 1
0b, and the inner peripheral surface thereof is tapered. The wall portion 10a can be mounted inside one end of the jig body 1. A screw portion 10c is formed on the outer peripheral surface of the wall portion 10b. By mounting such a metal reinforcing member 10 on the plastic jig main body 1, the jig main body 1 does not have to be damaged during the reverse lining.

The ring member 11 is made of an elastic plastic material, and has a tapered wall. The size of the ring member 11 is such that its tapered outer peripheral surface can be substantially engaged with the tapered inner peripheral surface of the jig reinforcing member 10.

The cover member 15 is formed of the jig reinforcing member 10.
Made of the same brass material as. The cover member 15 is
It has an opening 15b, and has a screw 15 on its inner peripheral surface.
a is formed. The cover member 15 can be screwed to the reinforcing member 10 by the screw portion 10c formed on the outer peripheral surface of the jig reinforcing member 10 and the screw portion 15a formed on the inner peripheral surface of the cover member 15.

Next, the use state of the reversing jig of the present invention will be described.

First, as shown in FIG. 3, the jig body 1 is mounted on one end of a pipe P to be constructed. At this time, pipe P
Of the pipe P abuts (non-closely contacts) the step portion 1c (FIG. 1) in the jig body 1, and the outer surface near the open end of the pipe P abuts on the inner surface of the wall 1a of the jig body 1. Become like

Next, the jig reinforcing member 10 is mounted on the jig main body 1 in the positional relationship shown in FIG. At this time, the outer surface of the wall 10a of the jig reinforcing member 10 comes into contact with the inner surface of the wall 1b of the jig main body 1. The jig reinforcing member 10 is fixed to one end of the jig main body 1 by inserting a screw (not shown) into the screw hole 5 and tightening the screw.

Thereafter, as shown in FIG.
1 is mounted on the inverted lining tube L. Specifically, the ring member 11 is passed through the inverted lining tube L in the direction shown in FIG. 2 to a length f (about the same as the width of the ring member 11). Then, a claw of a ring setter (not shown) is inserted into the inside of the tip of the reversing tube L, the tip of the tube L is spread, and the tube corresponding to the length f is folded back to cover the outer surface of the ring member 11.

Next, an adhesive is sealed in the inverted lining tube L. The ring member 11 covered with one end of the tube L after sealing the adhesive is fixed to the jig reinforcing member 10 in the direction shown in FIG.
Install inside. At this time, due to the elasticity of the ring member 11, one end of the lining tube L is annularly fixed in the jig reinforcing member 10 in a folded state.

Finally, the cover member 15 is connected to the jig reinforcing member 1.
By screwing to 0, one end of the inverted lining tube L and the ring member 11 are stopped so as not to fall outside.

In the reversing lining method, a reversing joint (not shown) is connected to the cover member 15 side. Since the pressurized fluid from the rear flows into the reversing jig through the reversing joint, the fluid pressure acts on the folded portion 22 of the lining tube L through the space 21 as shown in FIG. . As described above, since the folded portion 22 is gradually advanced from one end of the pipe to the other end thereof along the pipe, the lining tube L is reversely introduced into the pipe P so that its inner surface becomes the outer surface. become. As a result, as shown in FIG.
It is pressed against the inner surface of the existing pipe P over the entire length of the existing pipe P by the fluid pressure and the adhesive.

As described above, after the lining tube L is reversely introduced into the existing pipeline P and pressed against the inner surface of the pipe, the heating fluid (liquid) passes through the lining tube L via a reversing joint (not shown). Circulated. The circulation of the heating fluid accelerates the curing of the adhesive, so that the adhesion between the outer surface of the lined tube L after inversion and the inner surface of the tube is accelerated.

On the other hand, a liquid fluid is generally used as the heating fluid, and since the outer surface of the lined tube L after inversion is a water-absorbing fiber layer, the liquid fluid easily penetrates the fiber layer. Has become. The liquid fluid that has entered the fiber layer flows along the fiber layer due to the pressure of the heating fluid circulating in the lined tube L after inversion. Through the through hole 2 (FIG. 4).

As described above, the reversing jig uses the lining tube L
Since there are a plurality of through holes 2 for letting out the liquid fluid that has entered the fiber layer of the tube L, the liquid fluid that has entered the fiber layer of the tube L does not remain in the fiber layer. Therefore, it is possible to prevent the adhesiveness between the outer surface of the lining tube L and the inner surface of the tube from being deteriorated, and the bonding between the outer surface of the tube L and the inner surface of the tube is of high quality due to the above-described heating action of the circulating fluid.

[0031]

According to the present invention constructed as described above, since the reversing jig is formed with a plurality of through holes in its wall, it becomes an outer surface after the inversion of the pipe. Since the liquid fluid that has entered the fiber layer of the tube can be discharged to the outside through these through holes, it is possible to prevent the adhesiveness between the outer surface of the lining tube and the inner surface of the existing tube from being deteriorated. Therefore, by circulating the heating fluid in the lining tube which has been inverted and introduced into the existing pipe, the adhesion between the outer surface of the lining tube and the inner surface of the pipe is of high quality, and the quality of the inverted lining construction is improved.
Also, by mounting the reversing jig at the end of the pipeline, one end of the lining tube can be easily locked, and the tube can be accurately adhered to the inner wall of the pipeline,
The work of so-called pipe end treatment for preventing liquid from entering between the tube and the pipe inner wall surface at the pipe end can be omitted, and the construction labor can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded view of a reversing jig according to the present invention.

FIG. 2 is a view showing an inverted lining tube to which a ring member is attached.

FIG. 3 is a sectional view of the reversing jig of the present invention assembled at one end of an existing pipeline just before the reversing lining.

FIG. 4 is a sectional view of the reversing jig of the present invention at one end of an existing pipeline immediately after the reversing lining.

[Explanation of symbols]

 P Existing piping L Inverted lining tube 1 Jig body 1a Wall section 1b Wall section 1c Step section 2 Through hole 3 Flange section 4 Seal material 5 Screw hole 10 Jig reinforcing member 10a Wall section 10b Wall section 10c Screw section 11 Ring member 15 Cover member 15a Screw part 15b Opening

Continuation of front page (56) References JP-A-4-208434 (JP, A) JP-A-5-37857 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 63 / 00-63/48 F16L 1/00 F16L 55/16-55/18

Claims (5)

(57) [Claims] 1. A flexible lining tube is introduced into a pipeline from an opening at one end of an existing pipeline buried underground while being inverted, and is interposed between the tube and an inner wall surface of the pipeline. In a reversing jig used for a method of rehabilitating and repairing an existing pipe in which an adhesive is cured and a tube is adhered to an inner surface of a pipeline, the reversing jig is attached to one end of the pipeline, and a plurality of through-holes penetrate a circumferential wall surface. A substantially cylindrical jig body having a hole, a substantially cylindrical jig reinforcing member fitted to an inner peripheral surface of a rear end portion of the jig body, and a lining attached to the inner peripheral surface of the jig reinforcing member. A ring member for holding one end of the tube between the jig reinforcing member, and a cover member attached to the outside of the jig reinforcing member so as to fix the one end of the lining tube and the ring member inside the jig reinforcing member; Used for rehabilitation and repair of existing pipes, characterized by having That reversing jig. 2. The jig body is formed of a plastic material to which resin does not easily adhere, and the jig reinforcing member and the cover member are formed of a metal material having a required strength. The reversing jig according to claim 1. 3. The jig body is made of polyethylene, Teflon (registered trademark) or Duracon (registered trademark).
3. The reversing jig according to claim 2, wherein the reversing jig is formed of: 4. The reversing jig according to claim 1, wherein the cover member is screwed to the outside of the jig reinforcing member. 5. The reversing jig according to claim 1, wherein the ring member is made of a material having elasticity, and a wall of the ring member is tapered.