JPH11351490A - Partial repairing method and jig for existing conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the partial repairing method of an existing conduit and its necessary jig, capable of partially repairing the existing conduit with a partial damage part with a fixing tubing with shape recoverableness. SOLUTION: This is a partial repairing method for an existing conduit 3 having a partially damaged part with thermoplastic resinous repair tubing 1, and as this repairing tubing 1, such one as being deformed so as to make a sectional external area decrease in a state that such a capacity as is shape- recovered to a cylinder body at a shape memory temperature is imparted, is used, which consists of the following three processes that the repairing tubing 1 is inserted into the damaged part 3A, the repairing tubing 1 is heated by the shape memory temperature from the inside and thereby being recovered to the original cylinder body, and this cylinder body 1' is expanded by air pressurization from the inside in an afterheat state and then being air-cooled whereby a regenerated pipe is formed in the damaged part 3A of the existing conduit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a jig for repairing a part of an existing pipeline having a damaged part with a repair pipe made of thermoplastic resin.

[0002]

2. Description of the Related Art Conventionally, as a method of rehabilitating an aging pipe made of reinforced concrete pipe (fume pipe) or steel pipe, a new resin pipe having a predetermined length and a small diameter is inserted into an existing pipe while sequentially connecting the pipes. And laying a rehabilitation pipeline,
There is known a method of sealing by injecting a backfill material such as mortar or a foamable resin material into a gap with an existing pipeline.

In the rehabilitation method using this backfill material, there is a problem that the effective flow rate is reduced because the inner diameter of the rehabilitation pipe is considerably smaller than the inner diameter of the existing pipe. Since it is necessary to inject a sealing material into the gap between the road and the seal, there is a problem that workability is poor and rehabilitation work is slow.

In view of this point, for example, Japanese Patent Laid-Open No.
No. 31 discloses a pipe liner deformed into a U-shaped cross section having a cylindrical shape at a shape memory temperature made of a thermoplastic resin and drawn into a pipe inner surface such as a sewage pipe by heating and pressure expansion. And lining the inner surface of the pipe.

[0005]

However, this method is a method for lining the inner surface of a pipe such as a sewage pipe and the like, and it is not suitable for repairing an existing pipe where a damaged portion is partially generated. There is a problem that it cannot be applied.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and allows an existing pipe line having a damaged portion to be partially repaired with a repairing pipe material having shape recoverability. An object of the present invention is to provide a method and a jig for repairing a part of a pipeline.

[0007]

The invention according to claim 1 of the present application (the present invention 1) provides an existing pipe for repairing an existing pipe having a damaged portion with a repair pipe made of thermoplastic resin. A method of repairing a part of a road, wherein the repairing tubing is modified so that the cross-sectional outer area is reduced in a state where the shape of the cylindrical body is restored at a shape memory temperature. Inserting the repair tube into the damaged portion of the existing pipeline, heating the repair tube to the shape memory temperature from the inside to recover the shape to the substantially original cylinder, and thereafter, leaving the cylinder in a residual heat state A method for repairing a part of an existing pipeline, which comprises a step of forming a rehabilitated pipe at a damaged portion of the existing pipeline by air-pressing and expanding the interior of the pipeline by air cooling.

The invention described in claim 2 of the present application (Invention 2)
Is a partial repair of an existing pipeline in which the existing pipeline having a part of the damage is repaired with a repair pipe made of thermoplastic resin,
The repair jig comprises a tip jig connected to the tip of the repair tube and a rear jig connected to the rear end. The tip jig has a wire for pulling the repair tube to the head of the main body. An eyebolt is provided for fixing the rubber piper, and a rubber stopper is provided at a base end thereof, and an internal pressure is applied to the rubber packer from an air source in a distal end portion of the repair pipe. In addition to being able to be locked by expanding the diameter, there is provided a through hole for discharging the steam supplied into the repair tubing to the outside, and the rear end jig is provided at the front end of the main body. A retaining rubber packer is provided. The rubber packer can be locked by expanding its diameter by applying an internal pressure from an air source in a rear end portion of the repairing pipe material, and There is a through hole to supply steam in the pipe設管 path is a partial repair jig.

In the present invention, examples of the material of the repair pipe include a thermoplastic resin such as polyethylene which can be used as a pipe for normal rehabilitation, and high-density polyethylene is particularly preferable.

In the present invention, as a repair pipe, a cylindrical pipe extruded from an extruder is cooled to a shape memory temperature.
In a state where the performance of recovering the shape into a cylindrical shape at the shape memory temperature is given, a shape which is deformed so as to reduce the cross-sectional outer area and which is wound around a drum in this state is used.

According to the present invention, in the existing pipeline after the partial repair, the outer shape area of the cross section is further reduced in a state in which the shape of the cylindrical body is restored at the shape memory temperature. Insert the deformed pipe liner over the entire length including the damaged part, heat it to the shape memory temperature from the inside to recover the shape to the substantially original cylinder, and expand the cylinder by applying air pressure from the inside in the residual heat state After that, the lining is rehabilitated by air cooling. The pipe liner is not limited to the above, and any pipe liner that can be used as a normal pipe liner can be appropriately used.

[0012]

According to the method of the present invention for repairing a part of an existing pipe, the repairing pipe is deformed so as to reduce the cross-sectional outer area in a state where the shape of the cylindrical body is restored at a shape memory temperature. The repairing tubing, inserting the repairing tubing into the damaged portion of the existing pipeline, heating the repairing tubing to the shape memory temperature from the inside to recover the shape to the substantially original cylindrical body, After expanding the cylindrical body by pressurizing air from the inside in a residual heat state, by air cooling,
By forming a rehabilitated pipe in the damaged part of the existing pipeline, after forming a rehabilitated pipe having substantially the same inner diameter as the other part in the damaged part of the existing pipeline, partially repairing the The entire inner surface including the repaired portion of the existing pipeline can be lined with an appropriate pipe liner to rehabilitate it so as to have a uniform inner diameter continuously.

[0013] The partial repair jig of the existing pipe line according to the second aspect of the present invention comprises a front jig connected to the front end of the repair pipe and a rear end jig connected to the rear end. An eyebolt for fixing a wire for pulling the repair pipe material is provided at the head of the main body, and a stopper rubber packer is provided at a base end portion.The rubber packer includes:
Within the distal end of the repair tube, the inner diameter can be expanded and locked by applying an internal pressure from an air source,
A through hole is provided for discharging steam supplied into the repair pipe material to the outside, and the rear end jig is provided with a retaining rubber packer at a front end portion of the main body. In the rear end portion of the repair pipe material, a diameter is increased by applying an internal pressure from an air source so that the diameter can be locked, and a through hole for supplying steam into the repair pipe material is provided. As a result, the front end jig is mounted on the front end of the repair tube, the rear end jig is mounted on the rear end, and the inner diameter is increased and locked by applying internal pressure from an air source to the rubber packer. After supplying steam to the repair tube and heating it to the shape memory temperature to recover the shape to the substantially original cylinder, the cylinder is air-pressurized from the inside in a residual heat state. After expansion, air cooling is performed to update the damaged part of the existing pipeline. It can be used as a jig for forming a tube.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a part of a repair pipe used in the present invention, and FIG. 2 is a front view illustrating a manufacturing process of the repair pipe shown in FIG.

As shown in FIG. 1, the repair tubing 1 is made of high-density polyethylene, and is provided with an ability to recover to a cylindrical shape at a shape memory temperature. It has a concave portion 11 and is deformed so as to reduce the cross-sectional outer area.

As a method for manufacturing the repair pipe material 1, for example, as shown in FIG. 2, a cylindrical pipe is extruded by an extruder 21 (extrusion temperature 190 ° C.), and the cylindrical pipe is
After passing through the traverse part 25, it is cooled by the deformation device 23 at the shape memory temperature (resin temperature 125 ° C.) so as to have a concave portion along the axial direction on the outer periphery. Then, a method of winding on the drum 26 or the like is adopted.

An example of the method for repairing an existing pipeline according to the present invention will be described below with reference to FIGS. First, in the first step, as shown in FIG. 3, a repair pipe 1 having a length corresponding to a damaged portion of an existing pipeline was cut out, and the repair pipe 1 was connected to a front and rear end of a partial repair jig. In this state, it is inserted into the damaged portion 3A of the existing pipeline 3 by being pulled by the wire 8 with the winch 7.

As shown in FIG. 4, as the partial repair jig, a jig composed of a front jig 4 connected to the front end of the repair tube 1 and a rear end jig 5 connected to the rear end is used. The tip jig 4 is provided with an eyebolt 42 for fixing a wire for pulling the repair tubing 1 to the head of the main body 41,
The base end is provided with a retaining rubber packer 43. A swivel joint may be provided instead of the eyebolt 42. In that case, even if the repair pipe 1 which pulls the repair pipe 1 is twisted, it can be towed. The rubber packer 43 is adapted to be expanded and locked in the distal end portion of the repair tube 1 by applying an internal pressure from an air source (not shown). In the rubber packer 43, the repair tubing 1
There is provided a through hole 45 leading to a steam discharge hose 44 for discharging the steam supplied into the outside (see FIG. 5).

The rear end jig 5 is provided with a retaining rubber packer 52 at the front end of a main body 51. Rubber packer 5
Reference numeral 2 denotes an inner diameter that can be expanded and locked by applying an internal pressure from an air source (not shown) in the rear end portion of the repair pipe 1. The rubber packer 52 has a through hole 521 that communicates with a steam supply hose 53 for supplying steam into the repair pipe 1.
Is provided.

A tip jig 4 is attached to the tip of the repair pipe 1.
The rubber packer 43 is inserted so that the inner diameter is increased and locked by applying an internal pressure from an air source, and the rear end jig 5 is provided at the rear end with the rubber packer 52.
Is inserted, and the diameter is increased and locked by applying an internal pressure from an air source.

Next, as shown in FIG. 6, steam is supplied from the steam generator / pressurizer 6 through the steam supply hose 53 into the repair pipe 1 and the steam is discharged through the steam discharge hose 44.
The repair tubing 1 is heated to a shape memory temperature of 125 ° C. so as to discharge the outside. As a result, the heat is restored to the cylindrical body 1 '.

In the next step, as shown in FIG. 7, the steam discharge hose 44 is closed, and the steam generation /
The compressed air is sent from the pressurizer 6 into the cylindrical body to be pressurized and expanded from the inside. In this pressurized state, after cooling and fixing to form the rehabilitating pipe 1 '' at the damaged portion 3A, the tip is cured. The tool 4 and the rear end jig 5 are removed, and the partial repair of the damaged portion of the existing pipeline 3 is completed.

Thereafter, although not particularly shown, in the existing pipeline after the partial repair, the cross-sectional outer area is reduced in a state where the ability to recover the shape of the cylindrical body at the shape memory temperature is appropriately provided. Insert the deformed pipe liner over the entire length including the damaged part, heat it to the shape memory temperature from the inside to recover the shape to the substantially original cylinder, and pressurize the cylinder from the inside with residual heat After swelling, lining and rehabilitation are performed by air cooling.

[0024]

The method for repairing an existing pipeline according to the present invention 1 is as follows.
With the above configuration, it is possible to form a rehabilitating pipe having substantially the same inner diameter as the other part in the damaged part of the existing pipeline, and to partially repair the rehabilitating pipe.

Since the jig for repairing a part of an existing pipeline according to the second aspect of the present invention is constructed as described above, a rehabilitated pipe having substantially the same inner diameter as the other part is formed in a damaged part of the existing pipeline. It can be used as a jig for partial repair.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of an example of a repair pipe used in the present invention.

FIG. 2 is a front view showing an example of a method for manufacturing the repair pipe material shown in FIG.

FIG. 3 is a partial cross-sectional view illustrating a first step of an example of the partial repair method for an existing pipeline according to the present invention.

4 is a cross-sectional plan view showing a state in which the jig for repairing an existing pipeline of the present invention is used in the process shown in FIG. 3;

FIG. 5 is a sectional view taken along the line AA in FIG. 4;

FIG. 6 is a partial cross-sectional view illustrating an intermediate step of an example of the method for partially repairing an existing pipeline of the present invention.

FIG. 7 is a partial cross-sectional view illustrating a latter half of an example of the method for partially repairing an existing pipeline of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Repair pipe material 1 'Cylindrical body 1 "Rehabilitation pipe 3 Existing pipeline 4 Front jig 5 Rear end jig

Claims (2)

[Claims] 1. A method for repairing an existing pipeline having a damaged part with a repair pipe made of a thermoplastic resin, wherein the repair pipe has a cylindrical shape at a shape memory temperature. A step of inserting the repair pipe into the damaged part of the existing pipeline, using a piece deformed so as to reduce the cross-sectional outer area in a state where the shape recovery performance is given to the body, A step of heating the tube material to a shape memory temperature from the inside to recover the shape to a substantially original cylindrical body, then expanding the cylindrical body by applying air pressure from the inside in a residual heat state, and then cooling the air by air cooling. A method for repairing a part of an existing pipeline, comprising a step of forming a rehabilitation pipe in a damaged portion of the existing pipeline. 2. A jig for repairing an existing pipeline having a damaged portion with a repair pipe made of thermoplastic resin, the jig being connected to a tip of the repair pipe. Consisting of a tip jig and a rear end jig connected to the rear end, the tip jig is provided with an eyebolt for fixing a wire for pulling the repair pipe to the head of the main body, The base is provided with a retaining rubber packer, and the rubber packer can be locked by expanding its diameter by applying an internal pressure from an air source within the distal end of the repair tube. In addition, a through hole for discharging the steam supplied into the repair pipe material to the outside is provided, and the rear end jig is provided with a retaining rubber packer at a front end portion of the main body, The rubber packer has an air source inside the rear end of the repair pipe. A jig for repairing an existing pipeline, characterized in that the inner diameter of the jig can be increased and locked by applying internal pressure, and a through hole for supplying steam is provided in the repair pipe.