JPH08281799A - Joining structure and method for pipe lining materials - Google Patents

Abstract

PURPOSE: To provide a joining structure for pipe lining materials not generating a gap in the joined part of the pipe lining materials after curing and not narrowing the cross-sectional area of a pipeline by the joined part of the pipe lining materials. CONSTITUTION: The multilayered tubular resin absorbing materials 2, 12 and 3, 13 constituting a plurality of pipe lining material 1, 11 are mutually joined at the end parts thereof so that the joined parts A, B of the tubular resin absorbing materials 2, 12 and 3, 13 are shifted in the length direction of the pipe lining materials. Since the joined parts A, B are shifted in the length direction, it is prevented that the joined parts A, B are expanded to narrow the cross section of a pipeline. Even if a gap is generated in the joined parts A, B after the curing of the joined pipe lining materials 1, 11, the gap is covered with the tubular resin absorbing materials 13, 2 of the other layer and, therefore, no gap is generated as the whole of the pipe lining materials 1, 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure and joining method for pipe lining materials used for repairing pipe lines.

[0002]

2. Description of the Related Art When a pipeline such as a sewer pipe buried in the ground is deteriorated, the pipeline is repaired by lining its inner peripheral surface without excavating the pipeline from the ground. The pipe lining method is known.

That is, in the above pipe lining method, the pipe lining material is formed by impregnating an uncured curable resin into a flexible tubular resin absorbent material whose outer peripheral surface is covered with a highly airtight plastic film. The pipe lining material is inserted into the pipe line while being inverted by pressure, and the pipe lining material is pressed against the inner peripheral surface of the pipe line. This is a method of lining the inner peripheral surface of the conduit by curing the resin.

By the way, since the pipe lining material used in such a pipe lining method is used by cutting a pipe having a predetermined length into the length of the pipe line, a part which is not used and remains useless is serious. It was uneconomical.

Therefore, it is conceivable that a plurality of pipe lining materials are joined to form one long pipe lining material, and the long pipe lining material is cut to a required length for use.

[0006]

As a method of joining pipe lining materials to each other, the ends of two pipe lining materials are butted and the butted parts are sewn together with a thread to join the two pipe lining materials. If the pipe lining materials are joined together by this method, especially if the pipe lining material is composed of multiple layers of tubular resin absorbent material, the joint will swell and narrow the cross-sectional area of the pipeline. When the curable resin impregnated in the pipe lining material is cured, there is a problem that the joint portion separates due to heat shrinkage and a gap is generated between both pipe lining materials.

The present invention has been made in view of the above problems, and an object of the present invention is to form a gap in a joint portion of a pipe lining material after curing the pipe lining material or to disconnect a pipe line at a joint portion of the pipe lining material. An object of the present invention is to provide a joining structure and joining method for a pipe lining material that does not partially reduce the area.

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 is such that the end portions of the tubular resin absorbent materials of the respective layers of the plurality of pipe lining materials made of the multilayer tubular resin absorbent material are in contact with each other. Is joined together, and the joining portion of the tubular resin absorbent material of each layer is shifted in the lengthwise direction to form a joining structure of the pipe lining material.

Further, the invention according to claim 2 is a method of joining end portions of a plurality of pipe lining materials composed of a multi-layered tubular resin absorbent material formed into a tubular shape by sewing, in which the respective pipe lining materials are joined. Each layer of two adjacent pipe lining materials is formed by unthreading a predetermined length portion of the end of the tubular resin absorbent material of each layer to flatten the portion and cutting the flat portion of the tubular resin absorbent material of at least one layer. The end portions of the tubular resin absorbent material are abutted in a stepwise manner in the length direction, the abutted portions are sewn with a thread, and then the unthreaded portions of both pipe lining materials are sewn with a thread and restored. To do.

[0010]

According to the present invention, since the joint portion of the tubular resin absorbent material of each layer of the two pipe lining materials is displaced in the longitudinal direction,
The joint portion does not bulge at one place and the cross-sectional area of the pipeline is not narrowed. Further, even if a gap is formed in the joint portion of the tubular resin absorbent material of each layer after curing of the joined pipe lining material, since the gap is covered by the tubular resin absorbent material of the other layer, the pipe lining material as a whole There is no gap.

[0011]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial perspective view showing a joint structure of a pipe lining material according to the present invention.

In FIG. 1, reference numerals 1 and 11 denote pipe lining materials joined to each other.
Has a multilayer structure composed of two layers of inner and outer tubular resin absorbents 2, 12 (inner tubular resin absorbent) and 3, 13 (outer tubular resin absorbent). The outer peripheral surfaces of the are covered with highly airtight plastic tubes 4 and 14.

Thus, the two tubular lining materials 1 and 11 are joined to each other by the inner tubular resin absorbents 2 and 12 forming the inner layers thereof at the portion A shown in the figure, and the outer tubular resin forming the outer layers. The absorbers 3 and 13 are joined at the portion B shown in the figure, and the two joints A and B are displaced by the distance L in the length direction of the pipe lining materials 1 and 11. The ends of the plastic tubes 4 and 14 are overlapped with each other at a position between the joints A and B by a length ΔL. The outer circumferences of the joints A and B are covered with tapes 5 and 6 made of non-woven fabric, respectively.

Next, a method of joining the pipe lining materials 1 and 11 will be described with reference to FIGS. 2 to 10. 2 to 10 are explanatory views showing the joining method of the pipe lining materials 1 and 11 in the order of steps thereof.

In FIG. 2, reference numerals 1 and 11 denote two pipe lining materials to be joined.
Reference numeral 11 is configured by passing tubular resin absorbents 2, 12 and 3, 13 inside highly airtight plastic tubes 4 and 14, and the plastic tubes 4 and 14 have a larger diameter than the tubular resin absorbents 3 and 13. However, in the state before the both pipe lining materials 1 and 11 are joined, the plastic tubes 4 and 14 are not in close contact with the tubular resin absorbent materials 3 and 13.

By the way, the inner and outer tubular resin absorbent materials 2, 12 and 3, 13 constituting the respective pipe lining materials 1, 11 are
A sheet-shaped nonwoven fabric made of polyester, nylon, acrylic, polypropylene or the like is rolled into a tubular shape, and the butted portions are sewn together with threads 7 and 8 (see FIG. 7). Further, as the plastic tubes 4 and 14, tubes made of polyurethane, polyvinyl chloride, polyethylene, EVA, nylon or the like or tubes obtained by joining each of them in a multilayer structure are used.

In order to join the two pipe lining materials 1 and 11, first, as shown in FIG. 3, a plastic tube 4 covering the end portions of the pipe lining materials 1 and 11 on the joined side. , 14 are respectively folded back to the outside and pulled in the direction of the arrow shown in the drawing, and are turned up to expose the ends of the tubular resin absorbent materials 2, 12 and 3, 13 over a predetermined length. next,
The threads 7, 8 (see FIG. 7) on the exposed portions of the tubular resin absorbent materials 2, 12 and 3, 13 are unraveled, and the unraveled portions are opened and flattened as shown in FIG. Then, as shown in FIG. 5, of the respective pipe lining materials 1 and 11, for one pipe lining material 1, an end portion of the flattened portion of the outer tubular resin absorbent material 3 is cut by a length L, For the other pipe lining material 11, the end of the flattened portion of the inner tubular resin absorbent material 12 is cut by a length L.

Next, as shown in FIG. 6, the tubular resin absorbent materials 2, 12 and 3, 13 of the respective layers of the respective pipe lining materials 1, 11 are provided.
End portions of the tubular resin are abutted in a stepwise manner in the lengthwise direction, and first, a thin strip tape 5 made of a nonwoven fabric is adhered to the back side (outer peripheral surface side) of the abutted portions of the tubular resin absorbent materials 2 and 12 on both sides to form a tubular resin. The absorbers 2 and 12 are temporarily fixed, and the butted portions are sewn together with the thread 9.

When the two tubular resin absorbent materials 2 and 12 are joined as described above, the open flat portions of both are rolled back to the original tubular shape as shown in FIG. When sewn together, the tubular resin absorbent materials 2 and 12 become one continuous tube.

Next, as shown in FIG. 8, a thin strip tape 6 made of non-woven fabric is adhered to the back side (outer peripheral surface side) of the abutting portions of the outer tubular resin absorbent materials 3 and 13, and both tubular resin absorbent materials are adhered. 3 and 13 are temporarily fixed, and the butted portion is
Sew together.

When the tubular resin absorbent materials 3 and 13 are joined as described above, as shown in FIG. 9, the open flat portions of both are rolled back to the original tubular shape, and the portion where the thread 8 is unwound is unrolled. When sewn together, the tubular resin absorbent materials 3, 13 become one continuous tube.

Then, in the two pipe lining materials 1 and 11, the inner tubular resin absorbent materials 2 and 12 constituting the inner layers thereof are joined at the portion A in FIG. 9, and the outer tubular resin absorbent materials constituting the outer layer are absorbed. The materials 3 and 13 are joined at the portion B in FIG. 9, and the joining portions A and B are displaced from each other by the distance L in the length direction of the pipe lining materials 1 and 11.

Next, the wrapped plastic tubes 4 and 14 are returned to their original positions, and the ends of the tubular resin absorbents 2, 12 and 3, 13 are covered with the plastic tubes 4 and 14, and as shown in FIG. Both plastic tubes 4,1
The end portions of 4 are overlapped by a predetermined length ΔL.

Then, in the state shown in FIG. 10, if the tubular resin absorbents 2, 12 and 3, 13 are evacuated by a vacuum pump (not shown), the plastic tubes 4, 14 will become tubular resin absorbents 3, 13. If the plastic tubes 4 and 14 are heated while keeping close contact with the outer peripheral surface of the
The plastic tubes 4, 14 are tubular resin absorbent materials 3,
1 is welded to the outer circumference of 13, and the outer circumferences of the tubular resin absorbent materials 3 and 13 are coated with highly airtight plastic tubes 4 and 14, and the joining work of the both pipe lining materials 1 and 11 is completed, as shown in FIG. A joined structure can be obtained.

The pipe lining materials 1 and 11 joined by the above series of operations are used for repairing the pipe line in a state where the curable resin is impregnated in the tubular resin absorbent materials 2, 12 and 3, 13.

In the above, according to the present embodiment, the tubular resin absorbent materials 2, 1 of the respective layers of the two pipe lining materials 1, 11 are provided.
Since the joints A and B of 2 and 3, 13 are displaced by L in the length direction, the joints A and B do not bulge at one place and narrow the cross-sectional area of the conduit. Further, even if a gap occurs in the joint portions A and B of the tubular resin absorbent materials 2, 12 and 3, 13 of each layer after the pipe lining materials 1 and 11 that have been joined are cured, the gap is the tubular resin of the other layer. Covered with absorber (joint A
The gap at is covered with the outer tubular resin absorbent material 13,
Since the gap at the joint B is covered with the inner tubular resin absorbent material 2), no gap is generated in the joined pipe lining materials 1 and 11 as a whole.

Although the above description refers to the joining structure and joining method for a pipe lining material having a two-layer structure, the present invention is also applicable to a joining structure and joining method for a pipe lining material having a multilayer structure having three or more layers. Of course, it is possible.
Further, in the above embodiment, the ends of the tubular resin absorbent materials at the joint of the pipe lining material are abutted with each other at a surface perpendicular to the length direction, but they may be abutted with an oblique surface.

[0029]

As is apparent from the above description, according to the present invention, the joint portion of the tubular resin absorbent material of each layer of the two pipe lining materials is displaced in the length direction, so that the joint portion swells at one place. Does not narrow the cross-sectional area of the pipe line, and even if a gap occurs in the joint of the tubular resin absorbent material of each layer after curing of the joined pipe lining material, that gap will not absorb the tubular resin absorbent material of other layers. Since the pipe lining material is covered with the material, no gap is generated in the entire pipe lining material.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a joint structure of a pipe lining material according to the present invention.

FIG. 2 is an explanatory view showing a method of joining pipe lining materials according to the present invention.

FIG. 3 is an explanatory view showing a method for joining pipe lining materials according to the present invention.

FIG. 4 is an explanatory view showing a method of joining pipe lining materials according to the present invention.

FIG. 5 is an explanatory view showing a method of joining pipe lining materials according to the present invention.

FIG. 6 is an explanatory view showing a method of joining pipe lining materials according to the present invention.

FIG. 7 is an explanatory view showing a method of joining pipe lining materials according to the present invention.

FIG. 8 is an explanatory view showing a method of joining pipe lining materials according to the present invention.

FIG. 9 is an explanatory view showing a method of joining pipe lining materials according to the present invention.

FIG. 10 is an explanatory view showing a method of joining pipe lining materials according to the present invention.

[Explanation of symbols]

 1,11 Pipe lining material 2,12 Tubular resin absorbent material 3,13 Tubular resin absorbent material 5,6 Tape 7-10 Thread A, B Joint part L Joint part displacement amount

Claims (2)

[Claims] 1. An end portion of a tubular resin absorbent material of each layer of a plurality of pipe lining materials composed of a multilayer tubular resin absorbent material is joined together, and a joined portion of the tubular resin absorbent material of each layer is lengthwise. A joint structure for pipe lining materials, which is constructed by shifting. 2. A method for joining end portions of a plurality of pipe lining materials composed of a multi-layered tubular resin absorbent material formed into a tubular shape by sewing, the tubular resin absorbent material being in each layer of each pipe lining material. Unscrew the thread of a predetermined length at the end to flatten that portion and cut the flat portion of the tubular resin absorbent material of at least one layer to cut the tubular resin absorbent material of each layer of two adjacent tube lining materials. Butts the ends in a stepwise manner in the lengthwise direction, and sew the butted parts together with a thread,
Then, a method for joining pipe lining materials, characterized in that the unthreaded portions of both pipe lining materials are sewn together with the threads and returned to the original state.