JP3379751B2 - Rehabilitation repair method for 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 method for rehabilitating an existing pipe, and more particularly, to a curing treatment for an adhesive used when a lining tube is attached to the inner surface of the pipe.

[0002]

2. Description of the Related Art Various techniques have been developed and proposed so far as a technique for rehabilitating an existing pipe by laying it without digging. A lining technique is generally used as a technique for rehabilitating an existing pipe. For example, a lining lining method is known in which a flexible tube is drawn into the pipe and attached to the inner surface of the pipe. At present, this method has already been put to practical use as an effective repair technology for the deterioration of existing pipelines.

As one of the lining lining methods, the reverse lining lining method is applied.
In the reverse lining lining method, as shown in FIG. 7, a flexible inner lining tube 1 having an outer diameter substantially equal to the inner diameter of the pipe and containing an adhesive is reversed with respect to the existing pipe P so that the inner surface becomes the outer surface. While being introduced into the pipe, the lining tube 1 is adhered to the inner surface of the existing pipe P with the above adhesive.

As a concrete method, first, an adhesive is previously sealed in the flexible lining tube 1, and one end of the lining tube 1 is annularly fixed to one end (not shown) of the existing pipe P. Then, a folded portion is formed on the tube 1, and a fluid pressure is applied to the formed folded portion so as to apply pressure from the rear portion toward the other end of the conduit, so that the inner surface of the lining tube 1 becomes the outer surface. Invert it into the tube. In this way, the folded portion is gradually advanced along the inside of the pipe from one end of the pipe to the other end, and the lining tube 1 is pressed against the inner surface of the pipe over the entire length of the existing pipe P by the fluid pressure and the adhesive.

As the lining tube 1 advances in the reverse direction, the tip end of the tube comes out from the other end of the existing pipe P indicated by the reference symbol P'in FIG. Then, it is necessary to circulate the heating fluid to the inner lining tube 1 which is pressure-bonded to the inner surface of the existing pipeline to accelerate the curing of the adhesive. When circulating the heating fluid, as an example, the device having the configuration shown in FIG. 8 is used. In the circulation device shown in FIG. 8, the other end P ′ of the existing pipeline P is inserted, for example, as shown in the specification of Japanese Patent Application No. 8-255672 of the present applicant. The socket member 2, the cylindrical body portion 3 that seals the lining tube 1 that comes out of the other end P ′ and the cap member 4 that is fastened thereto, the connecting member 5, and the fluid introducing member 6 are provided. It is equipped with. Inside the cylindrical body portion 3, a tubular protruding portion 3A protruding downward from the lower end of the cylindrical body portion 3 is incorporated, and the tip thereof is connected to the connecting member 5.
The upper end surface 5A has a tapered surface.
The fluid introducing member 6 has a tip portion that can penetrate the outer wall of the cylindrical body portion 3 to open the lining tube 1, and a heater is built in the tip portion to facilitate the formation of the opening of the lining tube 1. Can be made into. In the above configuration, the socket member 2 is provided at the other end P ′ of the existing pipeline P.
While the connection member 5 is inserted thereinto,
The cylindrical body portion 3 is fastened to the socket member 2, and the cap member 4 is attached to the cylindrical body portion 3 to seal the inside.

FIG. 9 is a view showing an assembled state of the circulation device. In the assembled circulation device, the tip of the lining tube 1 coming out from the other end P ′ of the existing pipeline P is covered by the cap member 4. Before being stopped, a gap is provided between the tip end surface of the tubular protrusion 3A and the top end surface of the connecting member 5. When the lining tube 1 advances from the other end P ′ toward the cap member 4 and the tip is stopped by the cap member 4, the pressure applied inside the lining tube 1 is increased to increase the tubular protrusion 3A and the connecting member 5. A part of the lining tube 1 is inflated and deformed from the gap between and. After that, when the socket member 2 is rotated along the threaded surface of the tubular body portion 3 to reduce the gap between the distal end surface of the tubular protruding portion 3A and the upper end surface of the connection member 5, as shown in FIG. 9 (B). The expanded and deformed portions of the lining tube 1 sandwiched between these respective surfaces are intimately sandwiched between the distal end surface of the tubular protruding portion 3A and the upper end surface of the connecting member 5, respectively. When such a process is completed, an opening is formed in the lining tube 1 by the tip of the fluid introduction part 6,
A part of a circulation path for a fluid such as hot water flowing in the lining tube 1 is formed. In the circulation device C having the above configuration, when hot water or the like leaks from the opening of the lining tube 1 formed by the fluid introduction part 6, the outer surface of the lining tube 1 is separated by the expansion deformation part formed in the lining tube 1. Since the fluid such as hot water that tries to flow through the flow path is blocked, the entry of the fluid from the other end P ′ into the existing pipeline P is blocked. Therefore, it is possible to prevent the adhesive located between the outer surface of the inner tube 1 and the inner surface of the existing pipeline P from causing adhesion failure due to the interposition of the fluid.

[0007]

However, when the fluid such as hot water for hardening the adhesive is circulated after the above-mentioned lining tube 1 is inverted and inserted, there are the following problems.
In other words, when the circulation device is used, the state of the lining tube cannot be confirmed from the outside when the lining tube is inserted inside. Therefore, it is not possible to confirm the sandwiching state of a part of the expanded and deformed lining tube, and if the sandwiching is insufficient, it is possible to block the flow of fluid into the existing pipeline with that part as a boundary. become unable. As a result, there is a possibility that defective adhesion cannot be reliably prevented.
Moreover, in order to expand and deform the lining tube, a high pressure must be applied unlike when the fluid is introduced. For this reason, it is not possible to consistently set the pressure when inserting the lining tube, and not only the workability is poor, but also the lining tube that can withstand the high pressure needs to be prepared, which may increase the work cost. There is. Further, the size of the opening formed in the lining tube for circulating the fluid depends on the size of the tip of the fluid introducing portion, so that the size is limited. Therefore, the flow rate of the fluid circulated from the opening may be smaller than the flow rate of the fluid flowing in the lining tube, and the flow rate of the fluid supplied to the existing pipeline again may be insufficient. is there. In particular, when the length of the conduit inserted through the lining tube is long, the difference between the amount of fluid flowing in the conduit and the amount of fluid returning via the above-mentioned opening becomes large, causing insufficient flow rate. It will be easier.

[0008] The present invention is the light of the problems in the conventional retreading repair method, the adhesion failure of the adhesive is possible reliably prevented to be used in adhesion of the lining tube, the process for eliminating the adhesion failure even special pressure control An object of the present invention is to provide a method for rehabilitating and repairing an existing pipeline that can be easily performed without requiring such work.

[0009]

In order to achieve this object, the invention according to claim 1 provides a flexible lining tube in the pipeline from the opening at one end of the existing pipeline buried in the ground. Introduced while inverting, the adhesive interposed between the tube and the inner wall surface of the pipe is cured, and the tube is attached to the inner surface of the pipe in the rehabilitation repair method of the existing pipe, at the other end of the existing pipe. Connect one end of the flexible resin pipe, connect a transparent tube to the other end of the resin pipe, and after confirming that the lining tube has advanced into the transparent tube, clamp the flexible resin pipe. , The outer surface of the lining tube and the flexible resin pipe
Among the lining tubes in the transparent tube in the state of being in close contact with the inner peripheral surface, the other end of the flexible resin pipe is cut as a reference, and the fluid introduction device is connected to the other end of the flexible resin pipe. In addition, the holding of the flexible resin pipe is released, and the fluid is circulated through the lining tube and the circulation device.

According to a second aspect of the present invention, in the method for rehabilitating an existing pipeline according to the first aspect, the fluid introducing device is:
It is characterized in that it can be attached to the other end of the flexible resin pipe in a state of communicating with the other end of the lining tube located at the other end of the flexible resin pipe.

The invention according to claim 3 is the invention according to claim 1 or 2.
In the existing pipeline rehabilitation repair method described above, the lining tube is characterized by being advanced by negative pressure air generated in the traveling direction front side in the existing pipeline and pressurized air added in the traveling direction rear side. I am trying.

[0012]

According to the first aspect of the present invention, one end of the flexible resin pipe is connected to the other end of the existing pipeline, and the transparent tube is connected to the other end of the flexible resin pipe. The progress state can be confirmed from the outside, and the flexible resin pipe located in a part of the extension direction of the lining tube can be pinched in a state where it can be confirmed from the outside, and
The peripheral surface and the inner peripheral surface of the flexible resin pipe can be brought into close contact with each other. For this reason, it is possible to easily determine the time when the lining tube exits from the existing pipeline, and to apply an excessive internal pressure to the lining tube only by sandwiching the flexible resin pipe located in a part of the extension direction of the lining tube. It is possible to reliably seal a part of the inner lining tube without fail and to reliably block the fluid that is trying to reach the outer surface of the inner lining tube.

According to the second aspect of the invention, since the flow path of the fluid introducing device communicates with the extension line of the lining tube,
The flow path of the lining tube can be extended as it is without providing an opening or the like on the peripheral surface of the lining tube. As a result, unlike the case where the circulation path communicating with the lining tube is formed in a direction different from the extension direction of the lining tube, the flow path diameter does not become extremely small. It is possible to prevent the difference from the amount of fluid flowing in the passage from becoming small and the fluid flowing again in the lining tube from becoming insufficient.

According to the third aspect of the present invention, the lining tube can be inserted into the existing pipeline without requiring a traction member or the like for advancing the lining tube in the reverse direction.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the invention described in the claims will be described below with reference to illustrated embodiments. FIG. 1 is a diagram showing an apparatus used in the rehabilitation repair method according to the inventions described in claims 1 to 3, in which the other end of an existing pipeline (for convenience, a symbol P shown in the figure is used) is provided. , One end of a pipe material (hereinafter referred to as a flexible resin pipe) 10 made of a flexible resin such as polyethylene resin is connected, and the other end of the flexible resin pipe 10 is a transparent tube via an elbow 11. 12 are connected.
An intermediary member 13 is used to connect the flexible resin pipe 10 and the existing pipeline P, and the intermediary member 13 includes socket members 14 and 14 'at both ends in the extension direction. The intermediary member 13 is
As shown in FIG. 2, it is a connection member for connecting the existing resin pipe P and the flexible resin pipe 10 having a different diameter relationship, and as shown in FIG. , 14 'can be respectively fastened. The intermediate member main body 13A is formed with an existing conduit insertion portion 13A1 and a flexible resin pipe insertion portion 13A2 having different inner diameters inside, and the respective insertion portions are continuous with a tapered surface. Existing pipe P and flexible resin pipe 10
Are insertion parts 13A1 and 13A in the intermediate member body 13A.
The outer peripheral surface is clamped and prevented from coming off by being inserted into the connector 2 and fastening the socket members 14 and 14 '.

On the other hand, the other end of the flexible resin tube 10 and the transparent tube 12 are connected by the structure shown in FIG. In the case of the present embodiment, the structure shown in FIG. 3 is set up so that the working position of the lining tube (reference numeral 1 shown in the drawing is used for the sake of convenience) when cutting is brought close to the operator's hand, as described later. Has been That is, in FIG. 3, the socket member 15 having the same configuration as that shown in FIG. 2 is attached to the other end of the flexible resin pipe 10.
A resin pipe connector 16 is integrated with the socket member 15 via a taper screw portion formed on the inner peripheral surface of the end portion of the socket member 15. The resin pipe connector 16 has a screw formed on the outer peripheral surface of the end portion on the opposite side to the fastening portion with the socket member 15, and the elbow 11 is fastened to the screw at one end in the extension direction. The tube mounting member 17 is fastened to the elbow 11 via a screw formed on the outer peripheral surface of the other end in the extension direction. A recess for stopping the end of the flexible resin pipe 10 is formed on the inner surface of the resin pipe connector 16, so that the flexible resin pipe 10 can be fitted into the recess. Has become. The tube fitting 17 is
A corrugated groove portion 17A is formed on the outer peripheral surface near the tip portion, and a bellows-shaped transparent tube (in FIG. 3, for convenience,
The ends of 12) (shown as straight tubes) are fitted together.

In the rehabilitation repair method of this embodiment using the flexible resin tube 10, the elbow 11, the transparent tube 12 and the intermediary member 13 having the above structure, the following procedure is executed. First, as a first step, one end of the flexible resin pipe 10 is connected to the other end of the existing pipeline P via the intermediary member 13, and the elbow 11 is attached to the other end of the flexible resin pipe 10. The transparent tube 12 is connected via the. As shown in FIG. 4, the transparent tube 12 is connected to a resin recovery device 19 that communicates with a suction pump 18, and communicates via the flexible resin tube 10 when the suction pump 18 is driven. Existing pipeline P
The inside of the can be made negative pressure.

The inside of the existing pipeline P is made negative pressure by the suction pump 18 through the flexible resin tube 10, the elbow 11 and the transparent tube 12, and the lining tube 1 inserted from one end opening of the existing pipeline P. And the adhesive resin 20 is moved forward. In FIG. 4, the adhesive resin 20 is preliminarily injected from one end opening (not shown) of the existing pipeline P, and then the lining tube 1 filled with the adhesive resin is inserted between the mating surfaces. . In FIG. 4, reference numeral 20A indicates a lining pig that moves in front of the adhesive resin 20. Adhesive resin 20 and lining tube 1 injected and inserted into the existing pipeline P
Moves toward the other end of the existing pipeline P due to the negative pressure generated by the suction pump 18, but is expanded toward the inner surface of the existing pipeline P by the addition of pressurized air from the rear side in the traveling direction. You can proceed in a state.

The lining tube 1 that has advanced in the existing pipeline P
Also, the adhesive resin 20 advances even after reaching the other end of the existing pipeline P, passes through the intermediate member 13, the flexible resin tube 10 and the elbow 11, and advances into the transparent tube 12.

When the lining tube 1 advances into the transparent tube 12, the second step is executed. The second step is
After confirming that the lining tube 1 has advanced into the transparent tube 12, the flexible resin tube 10 is sandwiched, the transparent tube 12 is removed, and the lining tube 1 that has advanced into the transparent tube 12 is cut. In this step, as shown in FIG. 5, the clamp device 2 in which the flexible resin tube 10 shows only a part thereof
The outer peripheral surface of the lining tube 1 sandwiched by 1 and inserted through the inside and the inner peripheral surface of the flexible resin pipe 10 are in close contact with each other. By bringing the outer peripheral surface of the lining tube 1 and the inner peripheral surface of the flexible resin pipe 10 into close contact with each other, a fluid is flown between the inner peripheral surface of the flexible resin pipe 10 and the outer peripheral surface of the inner lining tube 1. In this case, the flow path when hot water used to accelerate the hardening of the adhesive resin is blocked is blocked. Moreover, the adjustment of the sandwiched state of the flexible resin tube 10 is performed while confirming it from the outside, so that the above-mentioned close contact state can be completed. When the sandwiching of the flexible resin pipe 10 is completed, the lining tube 1 is cut. At that time, the cutting is performed with the other end position of the flexible resin pipe 10 as a reference. Therefore, the lining tube 1 is barely exposed from the end of the flexible resin tube 10.

When the lining tube 1 is cut, the third step is executed. In the third step, hot water is circulated to accelerate the curing of the adhesive resin. In this case, the elbow 11 connected to the other end of the flexible resin pipe 10 is removed from the socket member 15, and the circulation device 22 is attached instead.
As shown in FIG. 6, the circulation device 22 has a fluid inlet 22A.
Is composed of a hose member connected to the other end of the flexible resin pipe 10 on the extension line of the flexible resin pipe 10, and a cock 23 having an opening / closing valve in a part, and a pressure gauge (not shown) are attached. Has been. When the circulation device 22 is connected to the other end of the flexible resin pipe 10, the flexible resin pipe 10 is unpinched with the cock 23 closed and the lining tube 1 in the flexible resin pipe 10 is removed. Restores the original shape so that warm water, which is a fluid, flows. When the sandwiching of the flexible resin pipe 10 is released, hot water is caused to flow into the lining tube 1 by a pump and a heating device (not shown), but prior to this, the circulation device 2
The second cock 23 is opened. Accordingly, the hot water passing through the lining tube 1 in the flexible resin tube 10 flows into the circulation system 2 in 2, via the circulator 22 and fed back to the pump and the heating device, flow into the re-lining tube 1 Circulate.

According to the above embodiment, the existing pipeline P
The threaded portion which is conventionally formed on the outer peripheral surface of the other end is unnecessary. That is, unlike the conventional construction method shown in the figure, the other end of the existing pipeline P does not require processing of a screw portion or the like, so that the number of working steps can be reduced.

[0023]

As described above, according to the invention described in claim 1, one end of the flexible resin pipe is connected to the other end of the existing pipeline, and the other end of the flexible resin pipe is connected to the other end. By connecting a transparent tube, the progress of the lining tube can be confirmed from the outside, and moreover, the flexible resin pipe located in a part of the extension direction of the lining tube is sandwiched in a state that can be confirmed from the outside , The outer surface of the liner tube and the flexible resin tube
Can adhere to the inner peripheral surface . For this reason, it is possible to easily determine the time when the lining tube exits from the existing pipeline, and to apply an excessive internal pressure to the lining tube only by sandwiching the flexible resin pipe located in a part of the extension direction of the lining tube. It is possible to reliably seal a part of the inner lining tube without fail and to reliably block the fluid that is trying to reach the outer surface of the inner lining tube. As a result, it is possible to reliably prevent defective adhesion of the adhesive used for bonding the lining tube, and it is possible to easily perform processing for eliminating this defective adhesion without requiring special pressure control or other work. .

According to the second aspect of the invention, since the flow passage of the fluid introducing device communicates with the extension line of the lining tube, the flow passage of the lining tube can be formed without providing an opening or the like on the peripheral surface of the lining tube. It can be extended as it is. As a result, unlike the case where the circulation path communicating with the lining tube is formed in a direction different from the extension direction of the lining tube, the flow path diameter does not become extremely small. It is possible to prevent the difference from the amount of fluid flowing in the passage from becoming small and the fluid flowing again in the lining tube from becoming insufficient.

According to the third aspect of the present invention, the lining tube can be drawn into the existing pipeline without requiring a traction member or the like for advancing the lining tube.
It is possible to prevent the equipment required for the rehabilitation repair from increasing in size and reduce the work cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of an apparatus used for a rehabilitation repair method according to the first to third aspects of the present invention.

FIG. 2 is a partial cross-sectional view of a main part shown in FIG.

FIG. 3 is a partial cross-sectional view of another portion of the main part shown in FIG.

FIG. 4 is a schematic diagram for explaining an example of equipment used in the rehabilitation repair method according to the invention described in claims 1 to 3.

FIG. 5 is a perspective view for explaining one step of the rehabilitation repair construction method according to the invention described in claims 1 to 3.

FIG. 6 is a perspective view for explaining another step of the rehabilitation repair method according to the invention described in claims 1 to 3.

FIG. 7 is a schematic diagram for explaining an outline of a rehabilitation repair method using an inner lining tube.

8 is a perspective view for explaining a conventional example of a device used in the rehabilitation repair method shown in FIG.

9A and 9B are views for explaining the operation of the apparatus shown in FIG. 8, in which FIG. 9A is an assembled state, and FIG. 9B is a cross-sectional view showing a part of a lining tube applied to the assembled apparatus. Is.

[Explanation of symbols]

1 Lined tube 10 Flexible resin tube 12 transparent tubes 13 Mediation member 14, 14 'socket member 16 Resin pipe connector 17 Tube fitting 18 Suction pump 19 Resin recovery device 20 Resin for adhesives 21 Clamp member 22 Circulator

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-122154 (JP, A) JP-A-7-208681 (JP, A) JP-A-60-165226 (JP, A) Patent 2986743 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29C 63/00-63/48

Claims (3)

(57) [Claims] 1. A flexible lining tube is introduced into the pipeline through an opening at one end of an existing pipeline buried in the ground, and the flexible lining tube is interposed between the tube and the inner wall surface of the pipeline. In a rehabilitation repair method for an existing pipe in which an adhesive is cured to attach the tube to the inner surface of the pipe, one end of the flexible resin pipe is connected to the other end opening of the existing pipe, and the flexible resin pipe the other end connected to the transparent tube, after confirming that the above lining tube into the transparent tube is advanced, sandwiching the flexible resin tube, lining tube
In a state where the outer peripheral surface of the flexible resin tube and the inner peripheral surface of the flexible resin tube are in close contact with each other, the lining tube in the transparent tube is cut with the other end of the flexible resin tube as a reference. A method for rehabilitating and repairing an existing pipeline, characterized in that the fluid introduction device is connected to the other end, and the holding of the flexible resin pipe is released to circulate the fluid through the lining tube and the circulation device. . 2. The method for rehabilitating an existing pipeline according to claim 1, wherein the fluid introduction device has a flow path formed on an extension line of the lining tube and communicating with an opening of the lining tube. The existing pipeline rehabilitation method. 3. The method for rehabilitating an existing pipeline according to claim 1 or 2, wherein the lining tube is added to the negative pressure air generated on the front side in the traveling direction in the existing pipeline and on the rear side in the traveling direction. A method for rehabilitating existing pipelines characterized by moving forward with pressurized air.