JPH10272403A - Lining equipment for partial repair of existing pipelines - Google Patents

Abstract

(57) [Problem] To provide a lining device having a configuration capable of reducing repair cost when performing lining repair on a pipeline in which a defective portion is partially generated. SOLUTION: A resin tank 2 is connected to a front side along a moving direction in a pipe, and a coating nozzle 3 is connected to a rear side, and the resin tank 2 is accommodated at a repair point in the pipe. The coating nozzle 3 includes a structure 22 capable of extruding a resin.
Is a resin passage 31 communicating with the resin tank 2 at the center of the inside.
And an injection unit 34 for radiating the resin flowing through the resin passage 31 in the radial direction.
The resin extruded toward is radially radiated in the tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining device for repairing a defective portion generated in an existing pipeline from the inside of the pipeline using a paint such as an epoxy resin.

[0002]

2. Description of the Related Art Gas and water supply pipelines are
A main pipe and branch pipes serving as low-pressure conduits are laid under the road, and a large number of supply pipes are branched from these conduits to constitute a piping system for supplying gas and the like to peripheral customers. In many cases, steel pipes commonly called “white gas pipes” are used for the main pipes and branch pipes described above. There is a possibility that a defective portion such as a hole may occur. Conventionally, a rehabilitation repair method has been proposed in which a lining film is formed on the inner surface of a pipe by using an epoxy resin or the like in order to regenerate the inside of the pipe that has been deteriorated.

Conventionally, in the above resin lining method, an epoxy resin is introduced into a pipe in a whole area in a pipe, and the epoxy resin is supplied to a predetermined area over the entire pipe by an air current transfer method, a pig transfer method or a differential pressure transfer method. A method of forming a lining film having a thickness is generally used.

[0004]

However, in a pipeline requiring rehabilitation and repair, a defective portion where a leak hole or the like occurs due to aging due to progress of corrosion hardly occupies the entire area of the pipeline. Often occurs. When rehabilitation repair is performed on such a pipeline, applying the conventionally proposed resin lining method will result in lining work being performed over the entire area of the pipeline, including the defective part that needs repair. Therefore, consumption of resin is large,
In addition, the operation time increases, and the repair cost may increase.

An object of the present invention is to provide a structure capable of reducing the repair cost when performing lining repair on a pipe in which a defective portion is partially generated in view of the above-mentioned problems in the conventional lining method. It is to provide a lining device.

[0006]

Means for Solving the Problems To achieve the above object, the invention according to claim 1 is an apparatus for applying a lining resin to an inner wall surface of a pipe while moving inside the pipe, wherein the lining resin is coated inside. The contained resin tank, the resin tank is provided with an application nozzle that can be sprayed lining resin integrated with the resin tank, the resin tank has a configuration that can extrude the contained resin at a repair location in the pipe, The coating nozzle includes a resin passage communicating with the resin tank at an inner center thereof, and an injection unit that radially radiates resin flowing through the resin passage, and is extruded from the resin tank toward the resin passage. It is characterized in that the resin is radiated radially in the pipeline.

According to a second aspect of the present invention, in the lining device for partial repair of an existing pipeline according to the first aspect, the resin tank slides toward a communicating position with the resin passage by an externally applied pressure. It is characterized in that a possible piston is provided.

According to a third aspect of the present invention, in the lining device for partial repair of an existing pipeline according to the first aspect, an annular resin formed inside the coating nozzle with a diameter larger than the resin passage. A reservoir portion is provided, an injection portion capable of communicating with the inside of the pipeline is provided on an outer diameter surface of the resin reservoir portion, and a resin introduction portion formed to be inclined from the resin passage is provided on an inner diameter surface. It is characterized by having.

According to a fourth aspect of the present invention, in the lining device for partial repair of an existing pipeline according to the third aspect, the resin introduction portion is constituted by a plurality of passages formed along a circumferential direction. Features.

[0010]

According to the first and second aspects of the invention, when the resin in the resin tank is extruded, the resin is radiated in the coating nozzle in the radial direction and is coated. The resin radiated in the radial direction from the application nozzle is injected at right angles to the inner wall surface of the pipeline, and therefore does not flow in the axial direction of the pipeline. Thereby, the thickness of the coating film on the inner wall surface of the conduit is made uniform.

According to the third aspect of the present invention, since the resin reservoir provided inside the application nozzle is formed in an annular shape, the resin from the resin passage can be evenly distributed in the circumferential direction. In addition, when a pressurized pressure from the resin flowing from the resin passage acts on the stored resin, an elastic restoring force of the stored resin is generated to increase the injection pressure together with the pressurized pressure. . In addition, since the injection portion in which the outer diameter surface of the resin reservoir communicates with the inside of the pipeline is provided continuously in the circumferential direction together with the resin reservoir, the resin can be uniformly injected in the circumferential direction of the pipeline. This can prevent uneven coating on the inner wall surface of the pipeline. Furthermore, since the resin introduction portion is inclined from the resin passage toward the resin pool portion, the flow direction of the lining resin when the resin introduction portion reaches the resin pool portion is not suddenly changed, and so-called resin flow is prevented. Can be radiated without disturbing. This makes it possible to perform uniform spraying in the circumferential direction of the pipeline.

According to the fourth aspect of the present invention, since the resin introduction portion can uniformly supply the oil in the circumferential direction of the oil reservoir, the resin can be applied in the circumferential direction of the pipeline without excess or shortage.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view for explaining a configuration of a main part of a lining device for partial repair (hereinafter referred to as a lining device for convenience) according to the first to fourth aspects of the present invention. In FIG. 1, a lining device 1 includes a pipe (for convenience, FIG.
Can be moved (in the direction indicated by arrow S) through the inside of the resin pipe 2 and the coating nozzle 3 on the same axis along the moving direction. Are connected to each other and provided in an integrated state.
The resin tank 2 includes a cylinder portion 21 capable of storing a lining resin therein, and a piston member 22 and a guide member 23 slidably disposed in the cylinder portion 21. The two ends of the cylinder portion 21 in the axial direction parallel to the moving direction of the lining device 1 are closed by plug members 24 and 24 ′, and the outer peripheral surface of the plug member 24 is positioned at equal positions in the circumferential direction in FIG. A guide member 23 as shown is provided. In FIG. 2, the guide member 23 includes plug members 24, 2
An elastic body 2 such as a spring inserted into a support member 25 fastened and fixed to a base 24A formed on the outer peripheral surface of 4 '.
The guide piece 27 is provided with a habit of protruding toward the inner peripheral surface of the pipeline by 6. The guide piece 27 slides on the inner peripheral surface of the pipeline to provide a centering function of the lining device 1.

Of the plug members 24 and 24 ', one end of a traction member 4 (see FIG. 4) made of a flexible hose wire is attached to the plug member 24 located on the front side in the moving direction of the lining device 1. The internal space of the traction member 4 is communicated with the space of the cylinder portion 21. For this reason, the plug member 24 has a vent hole 24 penetrating in the axial direction at the center thereof.
A is formed.

The piston member 22 located inside the cylinder portion 21 can slide inside the cylinder portion 21 by receiving compressed air from the traction member 4. A screw hole is formed in an end surface of the end surface of the piston member 22 opposite to the connection position of the traction member 4, and a rod 50 is formed in the screw hole as shown in FIG. It is designed to be removable. The rod 50 is a plug member 2
4 has an outer diameter that can be inserted into the ventilation hole 24A, and has a threaded portion at the tip. The rod 50
It is a member that can slide the piston member 22 by an external operation by being fastened and attached to the piston member 22. When the piston member 22 is pulled in the same direction as the moving direction of the lining device 1, the same principle as that of a so-called syringe is provided. With this, the lining resin can be injected into the cylinder portion 21. When introducing the lining resin into the inside of the cylinder portion 21, the plug member 24 ′ located on the side opposite to the side where the rod 50 is inserted is removed from the cylinder portion 21, and The opening of the portion 21 allows the injection of the lining resin. In FIG. 1, reference numeral 5 denotes a seal member mounted on the outer peripheral surface of the piston member 22.

On the other hand, the application nozzle 3 is fastened to and integrated with one plug member 24 'in the axial direction of the resin tank 2, and as shown in FIG. Lining resin passage 24 'penetrated to the center position at
A (see FIG. 1) is formed with a resin passage 31 communicating with A. As shown in FIG. 3, inside the application nozzle 3, a resin pool portion 32 formed of an annular concave portion is formed at a position larger in diameter than the resin passage 31.
Only the outer diameter surface has a slight gap in the axial direction (reference t in FIG. 3).
An injection portion 34 is formed with a gap (indicated by) and communicates with the outside air. The injection unit 34 is formed in the axial direction of the application nozzle 3 and in the radial direction of the application nozzle 3, and is configured to be capable of injecting the lining resin at right angles to the inner wall surface of the pipe. Although not shown, the inner diameter surface of the resin reservoir 32 is provided with a sealing member so that the resin does not leak toward the center.

Further, a resin passage 31 and a resin reservoir 32 are provided.
Are communicated with each other by the resin introduction section 33. The resin introduction portion 33 has openings in the resin passage 31 and the resin reservoir 32, respectively, and rises from the resin passage 31 toward the resin reservoir 32 by utilizing a difference in the arrangement position between the resin passage 31 and the resin reservoir 32. It is composed of a passage inclined in the direction.

Since the present embodiment has the above configuration,
It is used for the partial repair of the existing pipeline described in FIG. An existing pipeline which is to be partially repaired and described in FIG. 4 is a gas supply pipeline buried under a road L, and a branch pipe 6 as a low-pressure pipe from which a supply pipe 7 to a demand destination is branched. The pipe is a steel pipe commonly called a "white gas pipe". As a construction method at the time of the partial repair, a no-blow method is used in which repair is performed without removing gas in the pipe. 6A is formed, and the opening 6A is hermetically closed while allowing the lining device 1 to move, thereby preventing gas leakage. In the case of partial repair, the construction extension of the branch pipe 6 for repair is decided,
An opening 6A is provided by excavating a working shaft A on the ground and cutting off the branch pipe 6 at this position. Prior to the repair of the branch pipe 6, the location of the defective portion to be repaired in the pipeline is checked in advance by a well-known acoustic flaw detection method or a leak test based on internal pressure fluctuation.

Prior to the partial repair, if there is no lining resin in the resin tank 2 of the lining device 1, the lining resin is filled. At this time, the rod 50 is inserted from the side of the plug member 24 provided at one axial end of the cylinder portion 21 and fastened to the piston member 22, while the plug member 24 ′ at the other axial end is removed and one end of the cylinder portion 21 is removed. Is opened, and the opening is inserted into a resin housing member (not shown), and the rod 50 is pulled. Thereby, the lining resin is injected into the cylinder portion 21. This operation is performed not only in preparation for partial repair, but also when replenishing the lining resin in the resin tank 2.

When it is confirmed that the lining resin is filled in the resin tank 2, the branch pipe 6 having the defective portion is connected to the opening 6 A on the shaft A side by using the structure described in FIGS. 1 to 3. Is introduced into the pipe, and the lining apparatus 1 can be moved in the pipe to a location requiring partial repair.

When the lining device 1 is used, the tip of the traction member 4 of the lining device 1 is a shaft A
The lining device 1 is connected to a winch 8 installed on the ground, and the lining device 1 is moved by a winding operation of the winch 8.

An extension end of the traction member 4 wound around the winch 8 is communicated with a compressor 9 (fluid pressure supply means) having an adjustment valve installed on the ground together with the winch 8. Pressure is applied to the inside of the cylinder portion 21 of the resin tank 2 through the inside of the traction member 4. When the lining device 1 wound up by the winch 8 reaches a defective portion, fluid pressure from the compressor 9 is applied at a timing when the lining resin can be applied to the defective portion.

When the fluid pressure from the compressor 9 is applied, the pressure of the cylinder portion 21 in the resin tank 2 increases, the piston member 22 is pressurized, and the lining resin is injected from the application nozzle 3. In this case, the resin tank 2
Since the piston member 22 is pushed toward the coating nozzle 3 in the cylinder portion 21 provided therein, a uniform amount of the lining resin in the circumferential direction is applied to the resin passage 31 in the coating nozzle 3 by the resin introduction portion 33. Is extruded and supplied. When the lining resin reaches the resin reservoir 32, the pressure in the resin reservoir 32 is increased. The pressure in the resin reservoir 32 is increased by continuously filling the lining resin with the lining resin, and the lining resin is injected from the injection unit 34 with the increase in the pressure. The lining resin to be injected is injected at right angles to the pipe inner wall surface since the injection unit 34 is formed at right angles to the pipe inner wall surface, that is, in the radial direction of the application nozzle 3. Does not flow in the axial direction of the branch pipe 6 unlike the case where the pipe is inclined. In addition, the pressure on the accumulated lining resin is increased by newly supplying the lining resin to the accumulated lining resin in the resin accumulating portion 32. The pressure in the injection unit 34 is increased. This makes it possible to reduce the particle size of the lining resin sprayed on the inner wall surface of the pipeline, so that so-called spray coating can be performed, and the lining resin adhered to the inner wall surface of the pipeline is applied in a layered manner. This makes it easier to make the film thickness uniform.

Further, the resin introduction portion 33 which connects the resin passage 31 on the application nozzle 3 side with the resin accumulation portion 32 is formed to be inclined with respect to the resin accumulation portion 32, so that the resin introduction portion 33 is inclined. The radiation can be radiated without disturbing the flow of the resin without abruptly changing the flow direction of the lining resin when reaching the resin reservoir 32 from the portion 33. As a result, uneven jetting on the inner wall surface of the pipe is prevented.

When the partial repair is completed, the opening 6A of the branch pipe 6 is opened.
The lining device 1 is taken out from the opening, the opening 6A of the branch pipe 6 that has been interrupted is communicated with the other opening, and the shaft A
Is backfilled and the repair ends.

According to the present embodiment, the piston member 22 located in the cylinder portion 21 can be slid by the external operation by fastening the rod 50, so that new resin is refilled in the resin tank 2. Can be. This eliminates the need to replace the resin tank 2 itself,
It is possible to reduce the cost required for preparing a replacement resin tank.

[0027]

As described above, claims 1 and 2
According to the described invention, when the resin in the resin tank is extruded, the resin is radiated and applied in the coating nozzle at the coating nozzle, so that the lining can be performed only in a portion requiring partial repair. Become. As a result, partial repair can be performed without covering the entire pipeline, thereby reducing repair costs. In addition, at the time of the partial repair, the resin radiated from the application nozzle in the radial direction is injected at right angles to the inner wall surface of the pipeline, so that the resin does not flow in the axial direction of the pipeline. Thereby, the thickness of the coating film on the inner wall surface of the conduit is made uniform.

According to the third aspect of the present invention, as a configuration for performing a partial repair of the pipeline, the resin reservoir provided inside the coating nozzle is formed in an annular shape. The resin from the passage can be evenly distributed in the circumferential direction, and the elasticity of the stored resin is restored when the pressurized pressure from the resin flowing from the resin passage acts on the stored resin. Since the injection pressure can be increased together with the pressurizing pressure by generating a force, it becomes possible to apply the resin efficiently, and thereby the repair cost can be surely reduced. . In addition, since the injection portion in which the outer diameter surface of the resin reservoir communicates with the inside of the pipeline is provided continuously in the circumferential direction together with the resin reservoir, the resin can be uniformly injected in the circumferential direction of the pipeline. This makes it possible to prevent uneven coating on the inner wall surface of the pipeline and eliminate post-processing such as finishing at the time of partial repair, thereby reducing repair costs. Furthermore, since the resin introduction portion is inclined from the resin passage toward the resin pool portion, the flow direction of the lining resin when the resin introduction portion reaches the resin pool portion is not suddenly changed, and so-called resin flow is prevented. Can be radiated without disturbing. As a result, coating can be performed by uniform spraying in the circumferential direction of the pipeline, so that post-processing after repair can be omitted, and repair cost can be reduced.

According to the fourth aspect of the present invention, the resin introduction section can supply the resin uniformly in the circumferential direction of the oil reservoir, so that the resin can be applied in the circumferential direction of the pipeline without excess or shortage. It becomes possible to reduce the repair cost by eliminating the need for an inspection process or the like of the applied state of the coating.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an embodiment of a lining device for partial repair of an existing pipeline according to the present invention.

FIG. 2 is a view in the direction of an arrow II in FIG.

FIG. 3 is a cross-sectional view in which only a coating nozzle in the lining device shown in FIG. 1 is extracted.

FIG. 4 is a schematic diagram for explaining an existing pipeline to which the lining device shown in FIG. 1 is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lining apparatus 2 Resin tank 21 Cylinder part 22 Piston part 23 Guide member 24, 24 'Plug member 24'A Lining resin passage 3 Coating nozzle 31 Resin passage 32 Resin storing part 33 Resin introduction part 34 Injection part 4 Traction member 6 Tube Branch pipes 8 Winches 9 Fluid pressure supply means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Nobukatsu Ike 3-18-3 Daikan, Yamato-shi, Kanagawa Prefecture Inside the Hakko Technology Development Center Co., Ltd. (72) Masahito Shinozaki 3-183-3 Daikan, Yamato-shi, Kanagawa No. Inside the Hakko Technology Development Center

Claims (4)

[Claims] An apparatus for applying a lining resin to an inner wall surface of a pipe while moving in a pipe, comprising: a resin tank containing a lining resin therein; and an application capable of spraying the lining resin by being integrated with the resin tank. A nozzle, and the resin tank has a configuration capable of extruding the resin contained at a repair location in the pipe. The coating nozzle has a resin passage communicating with the resin tank at an inner center thereof, An injection unit for radially radiating the resin flowing through the resin passage, wherein the resin extruded toward the resin passage from the resin tank is radially radiated in the pipeline. Lining equipment for partial repair of existing pipelines. 2. The lining device for partial repair of an existing pipeline according to claim 1, wherein the resin tank is provided with a piston slidable toward a communication position with the resin passage by an externally applied pressure. A lining device for partial repair of an existing pipeline. 3. The lining device for partial repair of an existing pipeline according to claim 1, wherein an annular resin reservoir formed with a diameter larger than the resin passage is provided inside the coating nozzle, An injection portion capable of communicating with the inside of the pipeline is provided on an outer diameter surface of the resin reservoir portion, and a resin introduction portion formed to be inclined from the resin passage is provided on an inner diameter surface. Lining equipment for partial repair of existing pipelines. 4. The lining device for partial repair of an existing pipeline according to claim 3, wherein the resin introduction portion is constituted by passages formed at a plurality of positions along a circumferential direction. Lining equipment for partial repair of pipelines.