JP2503390Y2 - Resin pipe introduction device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a resin pipe introducing device used when lining a synthetic resin pipe into an existing pipe such as a sewer pipe, a water pipe, an oil pipe, etc. Is.

[Conventional technology]

For the purpose of strengthening the strength of existing pipes such as sewer pipes and water pipes, anticorrosion measures, water leakage / water infiltration measures, and flow rate improvement, a method of forming synthetic resin pipes inside the existing pipes has been adopted.

As this construction method, a reverse lining construction method in which the lining material is inverted and crimped to the inner surface of the existing pipe, and a lining construction method in which the lining material drawn into the existing pipe is expanded and crimped to the inner surface of the existing pipe are adopted.

The lining method is a method in which a resin pipe made of a thermoplastic resin such as vinyl chloride, polypropylene, polyethylene, or polybutene is inserted into an existing pipe, and the inserted resin pipe is closely attached to the inner wall of the existing pipe. In this lining method, when a resin pipe having an outer diameter that is substantially the same as or slightly larger than that of the existing pipe is used, the resin pipe is flattened to reduce the cross-sectional area in order to insert the resin pipe into the existing pipe.

In order to reduce the cross-sectional area of the resin pipe, as shown in, for example, JP-A-64-56531, JP-A-2-43024 or JP-A-2-154882, the first
As a step, the extruded resin pipe is flattened by flattening it in the diametrical direction to make it flat, and in the second step, it is bent in the longitudinal direction so that both ends in the major axis direction are close to each other, and the cross section is U.
It is processed into a V shape or a V shape. And the cross-sectional shape is U
The resin pipes that are shaped like a letter are wound and stored on a drum.

After that, when the resin pipe is lined in the existing pipe, the resin pipe wound around a drum or the like is transported to the position of the existing pipe, and the U-shaped resin pipe is inserted into the existing pipe, and both ends or One end has a closed structure, and a heating and pressurizing fluid is supplied to the inside, or a pipe expanding tool such as a pig is moved while supplying the heating fluid to soften and expand it so that it adheres to the inner surface of the existing pipe.

[Problems to be solved by the device]

In the above conventional lining method, in order to reduce the cross-sectional area of the extruded resin pipe, the resin pipe is processed into a U-shape in a two-step processing process, and the resin pipe is wound on a drum or the like. Therefore, the cross-sectional shape at the time of winding is large, resulting in a very large winding diameter, which is not easy to store and transport, and the cost of storage and transport is high.

Also, the larger the diameter of the resin pipe, the larger the cross-sectional shape at the time of winding, and it is not possible to wind a long resin pipe with a resin pipe with a diameter of 500 mm or more, and lining a long distance of the existing pipe. There was a disadvantage that it could not be done.

Further, when the diameter is 700 mm or more, there is a disadvantage that the winding is actually impossible and the processing efficiency and the construction efficiency of the resin pipe are reduced.

Also, when inserting a flat resin pipe into an existing pipe,
Since the resin pipe wound on the drum etc. is inserted into the existing pipe in a rigid state, it can be inserted without cutting in a narrow overflow area such as a manhole. However, when introducing a vinyl chloride pipe having a small elongation into a medium- or large-diameter pipe, the both ends of the existing pipe must be widely opened and cut.

In order to eliminate this disadvantage, there is also a construction method in which the resin pipe memorized in a flat shape is heated and softened and towed and inserted into the existing pipe, but long-distance towage where the self-weight increases and the self-weight per unit length is large. When pulling a meat pipe or a medium- or large-diameter pipe, the softened resin pipe stretches during pulling and the thickness becomes uneven, and the joint part of the existing pipe is misaligned, misaligned, or backside welded. However, there is a drawback in that a good resin layer cannot be lined because it is damaged by an obstacle such as a dripping of the resin.

The present invention has been made in order to solve such a disadvantage, and an object thereof is to obtain a resin pipe introducing device capable of easily inserting a long resin pipe into an existing pipe from a narrow overflow portion such as a manhole. To do.

[Means for solving the problem]

The resin pipe introducing device according to the present invention is configured such that the center portion of a thermoplastic resin pipe having a diameter substantially the same as or slightly larger than the existing pipe inner diameter is flatly crushed to guide the flattened resin pipe so that the cross-sectional area becomes small and the existing In the resin pipe introduction device that introduces into the pipe, the middle part is bent almost at a right angle, the diameter is gradually reduced in the latter part of the bending part, and the end has a reducer part having a reducer part formed with a diameter smaller than the existing pipe inner diameter. Then, the molding cylinder that guides the flattened resin pipe along the inner wall while circulating the heating fluid, and the molding cylinder are connected inside the reducer section, and the outer diameter gradually decreases according to the bore diameter of the reducer section. And a plurality of straightening rollers.

Further, it is preferable to dispose a cooling cylinder in the latter stage of the reducer portion of the molding cylinder.

[Action]

In this invention, a thermoplastic resin pipe having a diameter that is almost the same as or slightly larger than the existing pipe inner diameter is flattened by flattening the central portion of the thermoplastic resin pipe to reduce its cross-sectional area, and a molding cylinder in which a heating fluid is circulated. While guiding along the inner wall of the tube, it is sent to the reducer section of the molding cylinder, and the flat resin pipe softened by this heating fluid is made into a double-wall circular shape smaller than the existing tube inner diameter by a plurality of straightening rollers provided in the reducer section. It is processed and introduced into the existing pipe.

The molding pipe that guides this resin pipe is bent at a substantially right angle in the middle part, and the reducer is provided in the latter part of the bending part, so that the molding pipe is installed in a narrow overflow location such as a manhole, and the resin pipe is It can be processed into a heavy wall circular shape.

Further, by disposing the cooling cylinder at the latter stage of the reducer portion of the molding cylinder, the double-walled circular resin pipe can be cooled and hardened and introduced into the existing pipe.

〔Example〕

FIG. 1 is a partially cut front view showing an embodiment of the present invention. As shown in the figure, the resin pipe introducing device 1 is provided in a cylindrical receiving portion 2 provided in the vertical direction, a reducer portion 3 provided at a right angle to the bottom portion of the receiving portion 2, and a subsequent stage of the reducer portion 3. A molding cylinder 5 including a cooling unit 4 and a plurality of straightening rollers 6a arranged in the reducer unit 3 of the molding cylinder 5.
It is composed of ~ 6d.

As shown in the top view of FIG. 2, the upper end of the receiving portion 2 of the molding cylinder 5 has an opening 8 for introducing the flat resin pipe 7.
A heating fluid supply port 9 is provided on the side surface. The diameter of the reducer portion 3 is gradually reduced from the bottom of the receiving portion 2, and the diameter of the reducer portion 3 is smaller than the inner diameter of the existing pipe at the end.

A plurality of straightening rollers 6a arranged in the reducer section 3
Each of 6d is made of a steel roller. For example, as shown in the perspective view of FIG.
a and 6b have a spheroidal shape in which both ends are cut in the vertical direction, and the correction rollers 6c and 6d in the third and fourth steps have a spheroidal shape. It is formed so that the size becomes smaller in accordance with the diameter. The first-stage and second-stage straightening rollers 6a, 6b are attached to the side plates of the receiving section 2 and the reducer section 3 by rotating shafts 10a, 10 and the third-stage and fourth-stage straightening rollers 6c. As shown in FIG. 4, the central portions of 6 and 6d are attached to support plates 11c and 11d fixed to the upper surface of the reducer portion 3 via a support mechanism 12 having a free rotation motion such as a bearing mechanism.

A cooling unit 4 having a cooling fluid supply port 14 through a shield plate 13 having a valve 13a on the outer peripheral portion, at a subsequent stage of the reducer unit 3.
Is attached.

Next, the resin pipe introducing device 1 configured as described above
The operation of introducing the flat resin pipe 7 into the existing pipe 21 by using the above will be described with reference to the sectional view of FIG.

First, as shown in FIG. 6 (a), a resin pipe 7a made of a thermoplastic resin such as vinyl chloride, polypropylene, polyethylene, or polybutene and having a shape memory with an outer diameter substantially the same as the inner diameter of the existing pipe 21 is used. It is formed by extrusion molding. While softening this resin pipe 7a in a heating atmosphere, voids 22 remain inside both ends, and the flat portion is crushed so that the central portions are in close contact and molded into a flat resin pipe 7 with a small cross-sectional area, which is wound on a drum or folded. It is stored in the heating and heat retaining container 23.

This heating / warming container 23 and a boiler for supplying heated and pressurized fluid
After bringing 24 into the field, it is installed on the ground near the manhole 25 of the existing pipe 21, and the resin pipe introducing device 1 is fixed in the manhole 25.

On the other hand, the traction belt 26 is passed from the far end of the existing pipe 21 to the manhole 25.

Next, a guide hose 28 is provided between the outlet 27 of the heating and heat insulating container 23 and the opening 8 at the upper end of the molding cylinder 5 of the resin pipe introducing device 1.
Connect with. At this time, the tip of the flat resin pipe 7 housed in the heating / warming container 23 and the end of the traction belt 26 are tied together. Further, the boiler 24 and the heating fluid supply port 9 of the resin pipe introducing device 1 are connected by a forward hose 29, and the return port 30 of the heating and heat retaining container 23 and the boiler 24 are connected by a return hose 31. In this way, the circulation system of the heating and pressurizing fluid generated from the boiler 24 is connected to the boiler 24, the outward hose 29, the resin pipe introducing device 1, the guide hose 28, the heating and retaining container 23, the return hose 3
1, Form with the boiler 24.

Further, the cooling fluid supply port 14 of the cooling unit 4 provided at the subsequent stage of the reducer unit 3 of the resin pipe introducing device 1 is provided with a manhole.
It is connected to a cooling device 32 installed near 25.

In this state, a heated and pressurized fluid having a softening temperature (above the shape recovery temperature to below the shape memory temperature) of the flat resin pipe 7 from the boiler 24 is supplied to the circulation system to soften the flat resin pipe 7 wound on a drum or the like. Put in a state. And the existing pipe
The traction belt 26 is pulled from the far end of 21 and the softened flat resin pipe 7 is sent out from the heating / heat-retaining container 23 to the resin pipe introducing device 1 without applying tension. At this time, since the softened flat resin pipe 7 is subjected to the fluid pressure by the heating and pressurizing fluid, the flat resin pipe 7 is smoothly passed through the guide hose 28 without being expanded and the shape is recovered, and the resin pipe introducing device. 1 receiving section 2 is guided.

Here, if the diameter of the guide hose 28 is set smaller than the width of the flat resin pipe 7 as shown in FIG. 7, the flat portion was wound into the heat insulation container 23 and the center portion was flat. The resin pipe 7 can be preformed in a curved shape along the inner wall of the guide hose 28 and sent to the resin pipe introducing device 1.

The flat resin pipe 7 sent to the resin pipe introducing device 1 is guided along the inner wall of the receiving portion 2 while being reduced.
Sent to The flat resin pipe 7 is bent sharply in a horizontal direction at a right angle by the straightening roller 6a of the first stage of the reducer portion 3 and the molding cylinder 5 to increase the degree of curvature. After that, as the flat resin pipe 7 passes through the second-stage straightening roller 6b, the third-stage straightening roller 6c, and the fourth-stage straightening roller 6d, each of the straightening rollers 6b to 6d and the reducer section 3 is passed. The degree of curvature gradually increases due to the pressing force with the inner wall. After passing through the fourth-stage straightening roller 6d, a flat resin pipe 7b having a double-walled circular shape as shown in FIG. 8 is formed.

When forming the flat resin pipe 7b having a double-walled circular shape, both ends of the first-stage and second-stage straightening rollers 6a and 6b are cut, and the third-stage and fourth-stage straightening rollers 6a and 6b are cut. Since the lengths of 6c and 6d are shortened according to the diameter of the reducer portion 3, both ends of the flat resin pipe 7 can be molded without contacting the straightening rollers 6a to 6d. Therefore,
The voids 22 can be retained as they are inside the both ends of the flat resin pipe 7b.

The double-walled circular flat resin pipe 7b having an outer diameter smaller than the inner diameter of the existing pipe 21 passes through the shielding plate 13 and
It is pulled and inserted inside. When it is inserted into the existing pipe 21, cold air or cold water is supplied from the cooling device 32 to the cooling unit 4 to be discharged and sprayed into the existing pipe 21 to gradually cool the flat resin pipe 7b to the softening temperature or lower. Then, by curing while maintaining the double-walled circular shape, it is possible to suppress the elongation and damage of the flat resin pipe 7b that occur when pulling a long distance.

In this way, after inserting the flat resin pipe 7b over the entire length of the existing pipe 21, the resin pipe introducing device 1 is removed and the end portion of the flat resin pipe 7b is expanded with an expansion jig, and then the flat resin pipe 7b The heating / pressurizing fluid is supplied to the inside, or a pipe expanding tool such as a pig is moved while supplying the heating fluid to soften and expand it, and the resin pipe 7a is brought into close contact with the inner surface of the existing pipe 21. When the flat resin pipe 7b is softened and expanded, the voids 22 at both ends of the flat resin pipe 7b are used as the heating fluid, so that the portion of the flat resin pipe 7b that is ahead of the expansion surface can be preheated.

[Effect of device]

As described above, this invention circulates a heating fluid through a flat resin pipe processed by flatly crushing the central part of a thermoplastic resin pipe having a diameter slightly larger than that of the existing pipe to reduce its cross-sectional area. While guiding along the inner wall of the forming cylinder, send it to the reducer part of the forming cylinder,
The flat resin pipe softened by this heating fluid was processed into a double wall circular shape smaller than the inner diameter of the existing pipe by a plurality of straightening rollers provided in the reducer part, and was introduced into the existing pipe. The resin pipe has a substantially flat shape and can be wound around a drum or folded and stored.
For this reason, it is possible to wind long resin pipes and thick resin pipes with a small diameter, and it is possible to perform long-distance construction, and at the same time, it is easy to store and transport resin pipes during construction. Can be done.

In addition, the molding cylinder that guides the resin pipe is bent at a substantially right angle in the middle part, and by providing the reducer section after the bending section, the molding cylinder is installed in a narrow overflow place such as a manhole, and the resin pipe is Since it can be processed into a double wall circular shape, extra cutting work can be omitted,
The construction cost can be reduced.

In addition, the flat resin pipe can be molded with a small resistance by bending the flat resin pipe sequentially with a plurality of straightening rollers provided in the reducer section to form a double-walled circular shape. It is possible to significantly reduce the resistance when pulling and inserting the into the existing pipe.

Furthermore, by arranging the cooling cylinder in the latter part of the reducer part of the molding cylinder, the molded double-walled circular resin pipe can be cooled and hardened and introduced into the existing pipe, and when pulling a long distance. It is possible to suppress the elongation and damage of the flat resin pipe that occurs in the above.

[Brief description of drawings]

FIG. 1 is a partially cut front view showing an embodiment of this invention, and FIG.
FIG. 3 is a top view of the receiving portion of the molding cylinder, FIG. 3 is a perspective view showing a straightening roller, FIG. 4 is a sectional view taken along line AA of FIG. 1, and FIG. 5 is a sectional view showing a construction state according to the above embodiment. FIG. 6 is a perspective view showing a process for processing a flat resin pipe, FIG. 7 is a cross-sectional view of a guide hose portion, and FIG. 8 is a cross-sectional view showing a flat resin pipe molded into a double-wall circular shape. 1; resin pipe introducing device, 2; receiving part, 3; reducer part, 4;
Cooling unit, 5; Molding cylinder, 6a to 6d; Straightening roller, 7; Flat resin pipe, 21; Existing pipe, 23; Heating / heat retaining container, 24; Boiler, 25; Manhole, 32; Cooling device.

Claims (2)

(57) [Scope of utility model registration request] 1. A resin which is introduced into an existing pipe by guiding a flattened resin pipe so as to reduce the cross-sectional area by flattening the central portion of a thermoplastic resin pipe having a diameter slightly larger than that of the existing pipe. In the pipe introduction device, the middle part is bent almost at a right angle, the diameter is gradually reduced after the bend, and the end has a reducer part formed with a diameter smaller than the existing pipe inner diameter, and flattening while circulating the heating fluid. A molding cylinder that guides the resin pipe along the inner wall, and a plurality of straightening rollers that are continuously provided inside the reducer portion of the molding cylinder and that have an outer diameter that gradually decreases in accordance with the diameter of the reducer portion. A resin pipe introducing device characterized in that 2. The resin pipe introducing device according to claim 1, wherein a cooling cylinder is arranged in a stage subsequent to the reducer portion of the molding cylinder.