JP2678151B2 - Pipe lining material and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe lining material mainly used in a pipe lining method in which an inner peripheral surface of an aged pipe is lined to repair the pipe and a manufacturing method thereof.

[0002]

2. Description of the Related Art When a pipeline such as a sewer pipe buried underground is aged, a pipe lining method for lining and repairing the inner peripheral surface of the pipeline without excavating the pipeline. Has been proposed and put into practical use.

In the above-mentioned pipe lining method, a flexible pipe lining material impregnated with a curable resin is inserted into a pipe line while being inverted by a fluid pressure, and then the pipe lining material is pressed against an inner wall of the pipe line. In this method, the curable resin impregnated therein is cured, and the inner peripheral surface of the pipe is lined with the cured pipe lining material to repair the pipe.

By the way, FIG. 12 (a) shows a cross section of a main part of a conventional pipe lining material 110 used in such a pipe lining method. The conventional pipe lining material 110 is a resin absorbent material cut into a band shape. The thin ribbon-shaped tape 1 is attached to the outer surface of the sewn portion of the tubular resin absorbent material 101 obtained by butting the end portions in the width direction of the
No. 01a is applied and the outer surface of the tubular resin absorbent material 101 is covered with a highly airtight plastic tube 103, and the tubular resin absorbent material 101 is impregnated with an uncured liquid curable resin at the time of use. .

[0005]

The pipe lining material 110 is formed to have a diameter slightly smaller than the diameter of the pipe so that wrinkles do not occur when it is hardened in the pipe. 12 after the resin is inverted and cured in the pipeline.
As shown in (b), there is a problem that the sewn portion is opened and the strength of the portion is reduced.

The present invention has been made in view of the above problems, and its object is to make a pipe lining material capable of ensuring substantially uniform strength over the entire circumference without opening the seam after curing. And to provide a manufacturing method thereof.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 abuts the widthwise ends of the resin absorbent material cut into strips, and stitches the abutted portions. In a pipe lining material obtained by coating the outer surface of the obtained tubular resin absorbent material with a highly airtight plastic tube, a thin resin absorbent material was interposed along the length direction at the sewn portion of the tubular resin absorbent material. It is characterized by

According to a second aspect of the present invention, a tubular resin is formed by overlapping the widthwise ends of the resin absorbent material cut into strips with a thin resin absorbent material interposed therebetween, and stitching the overlapped portions. After the absorbent material is obtained, the outer surface of the tubular resin absorbent material is coated with a highly airtight plastic tube to produce a pipe lining material.

Therefore, according to the invention, since the thin resin absorbent material is present along the length direction in the sewn portion of the pipe lining material, after the pipe lining material is inverted and inserted into the pipe line,
Even if the ends of the tubular resin absorbent material are opened due to the hardening of the curable resin impregnated in it, the stitches will open due to the thin resin absorbent material between them, and a gap will be created there. Therefore, the pipe lining material has a substantially uniform strength over the entire circumference, and the partial strength does not become insufficient.

[0010]

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

1 to 5 are explanatory views showing a method of manufacturing a pipe lining material according to the present invention in the order of steps thereof, and FIG. 6 is a sectional view showing a vacuum drawing of a resin absorbent material. FIG. 7 is a partial perspective view of a pipe lining material manufactured by the method of the present invention.

In the method of the present invention, first, as shown in FIG. 1, the resin absorbent material 1'cut into strips is overlapped with each other with the narrow resin absorbent material 2 sandwiched between the widthwise ends thereof. When the stitching portion is sewn with a sewing machine (lock stitching), and when this stitching is completed, the sewn portion is pulled in the circumferential direction to obtain the tubular resin absorbent material 1 in which both widthwise end portions are abutted as shown in FIG. . At this time, the resin absorbent 2 is interposed in the sewn portion of the tubular resin absorbent 1. Incidentally, the resin absorbent 1
As (1 ') and 2, woven or non-woven fabrics such as polyester, nylon, acrylic, and polypropylene are used.

Next, as shown in FIG. 3, a ribbon-shaped tape 1a made of a thin non-woven fabric is attached to the outer periphery of the tubular resin absorbent material 1 along the sewn portion thereof to hide the seams. still,
As the tape 1a, the same material as the resin absorbents 1 (1 ') and 2 is used.

Thereafter, as shown in FIG. 4, a highly airtight plastic tube 3 is prepared, the tubular resin absorbent material 1 shown in FIG. 3 is passed through the plastic tube 3, and the tubular resin absorbent material 1 is hermetically sealed inside. Highly flexible pressurizing tube 4
Insert As the material of the plastic tube 3, polyurethane, polyvinyl chloride, polyethylene, polypropylene, nylon or the like is used.

Then, from the state shown in FIG. 4, both ends of the pressurizing tube 4 are closed so that the pressurizing tube 4 has a sealed structure, and the compressor 5 shown in FIG. 5 is driven to pass compressed air through the air hose 26. When it is supplied into the pressurizing tube 4, the pressurizing tube 4 receives the pressure of compressed air and expands, thereby expanding the tubular resin absorbent material 1 and the plastic tube 3 into a cylindrical shape.

While maintaining the above state, as shown in FIGS. 5 and 6, if the inside of the tubular resin absorbent material 1 is evacuated by using the vacuum pump 7 and the pressure reducing hose 8, the tubular resin absorbent material 1 will be drawn. The plastic tube 3 positioned on the outer side of is attracted to the negative pressure generated in the tubular resin absorbent material 1 and adheres to the outer peripheral surface of the tubular resin absorbent material 1.

Thereafter, as shown in FIG. 5, the tubular resin absorbent material 1 is passed through the cylindrical heating device 11 together with the plastic tube 3 and the pressurizing tube 4, and the heating device 11 is driven while being pulled. By pulling with and moving it from one end to the other end of the tubular resin absorbent material 1 in the direction of the arrow in the figure, the plastic tube 3 is heated and melted by the heating device 11, and is welded to the outer peripheral surface of the tubular resin absorbent material 1 one after another. As shown in FIG. 7, a pipe lining material 10 composed of a tubular resin absorbent material 1 whose surface is covered with a plastic tube 3 is obtained.

The heating device 11 includes an electric heater 1 spirally wound in the longitudinal direction along the inner peripheral surface of a cylindrical housing 13 having a diameter sufficiently larger than that of the tubular resin absorbent 1.
When the electric heater 14 is energized from the power source 15, the electric heater 14 generates heat and heats the plastic tube 3 as described above, and welds it to the outer surface of the tubular resin absorbent material 1. .

Next, a pipe lining method performed by using the pipe lining material 10 obtained as described above will be described with reference to FIGS. 8 to 11. 8 and 9 are sectional views showing the pipe lining method, FIG. 10 is an enlarged sectional view taken along the line AA of FIG. 9, and FIG. 11 is an enlarged detailed view of a portion B of FIG.

In FIG. 8, reference numeral 20 denotes a pipe line such as a sewer pipe buried in the ground, and the pipe lining material 10 is reversely inserted into the pipe line 20 by fluid pressure. That is, as shown in FIG. 8, one end of the pipe lining material 10 is folded back and attached to the outer periphery of the lower end opening of the pressure vessel 21, and the compressor 22 installed on the ground is driven to compress compressed air into the pipe 23. When the pipe lining material 10 is supplied from the inside into the pressure vessel 21, the pipe lining material 10 is inserted into the pipe line 20 in the direction of the arrow (right side) in FIG. 8 while being reversed by the pressure of the compressed air. As shown in FIG. 8, a pressure gauge 24 and a valve 25 are attached in the middle of the pipe 23.

By the way, a hot water hose 26 is attached to the end portion of the pipe lining material 10, and the pipe lining material 10 extends over the entire length of the pipe line 20 as shown in FIG.
The hot water hose 26 is drawn into the pipe lining material 10 and the pressure vessel 21 when it is inverted and inserted therein. A plurality of jet outlets (not shown) for jetting hot water are formed at appropriate intervals at a portion of the hot water hose 26 that faces the pipe lining material 10.

Further, as shown in FIG. 9, a hot water pump 27 is installed on the ground, and a drain pipe 2 attached to the lower part of the pressure vessel 21 is provided on the suction side of the hot water pump 27.
8 are connected. The discharge side of the hot water pump 27 is connected to the boiler 29, and the hot water hose 26 is connected to the boiler 29. Hot water hose 2
A thermometer 30 and a valve 31 are attached in the middle of 6.

Then, the inside of the pipe lining material 10 and the pressure vessel 21 are filled with compressed air to fill the pipe lining material 10 with the compressed air.
The hot water pump 2 while pressing the inner wall of the pipe 20.
When 7 and the boiler 29 are driven, hot water heated to a predetermined temperature by the boiler 29 flows through the hot water hose 26 in the direction of the arrow in FIG. 9 and is jetted from the jet port formed in the hot water hose 26. Then, the pipe lining material 10 is subjected to showering of hot water from the inside, and the thermosetting resin impregnated in the pipe lining material 10 is heated and cured by the hot water, and the inner circumference of the pipe 20 is lined with the hardened pipe lining material 10. To be done.

By the way, the pipe lining material 10 is formed to have a diameter slightly smaller than the diameter of the pipe line 20 so that wrinkles do not occur when the pipe lining material 10 is hardened in the pipe line 20. Even if the ends of the tubular resin absorbent material 1 are opened as shown in FIG. 11 after the curable resin is hardened, the thin resin absorbent material 2 intervenes between them so that the seam portion is opened and a gap is generated. , The resin absorbent 2 is integrated with the tubular resin absorbent 1 by curing the thermosetting resin impregnated in the resin absorbent 2 and the pipe lining material 1
0. Therefore, the pipe lining material 10 secures a substantially uniform strength over the entire circumference, and a partial lack of strength does not occur.

[0025]

As is apparent from the above description, according to the present invention, the thin resin absorbent material is interposed in the sewn portion of the pipe lining material along the lengthwise direction, so that the pipe lining material is provided in the pipe line. Even if the end portions of the tubular resin absorbent material are opened because the curable resin impregnated into the resin resin has been inverted after inserting it inside, the sewn portion will open because the thin resin absorbent material is interposed between them. There is no gap formed there, and the effect that the pipe lining material has a substantially uniform strength over the entire circumference can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a method for manufacturing a pipe lining material according to the present invention.

FIG. 2 is a perspective view showing a method for manufacturing a pipe lining material according to the present invention.

FIG. 3 is a perspective view showing a method for manufacturing a pipe lining material according to the present invention.

FIG. 4 is a perspective view showing a method for manufacturing a pipe lining material according to the present invention.

FIG. 5 is a perspective view showing a method for manufacturing a pipe lining material according to the present invention.

FIG. 6 is a cross-sectional view showing vacuuming of the resin absorbent material.

FIG. 7 is a partial perspective view of a pipe lining material produced by the method of the present invention.

FIG. 8 is a cross-sectional view showing a pipe lining method of construction using the pipe lining material according to the present invention.

FIG. 9 is a cross-sectional view showing a pipe lining method of construction using the pipe lining material according to the present invention.

FIG. 10 is an enlarged sectional view taken along the line AA of FIG. 9;

11 is an enlarged detailed view of a B part in FIG.

FIG. 12 is a cross-sectional view of a main part of a conventional pipe lining material.

[Explanation of symbols]

 1 Tubular Resin Absorbing Material 1'Band-shaped Resin Absorbing Material 2 Thin Resin Absorbing Material 3 Plastic Tube 10 Tube Lining Material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-56-501355 (JP, A) JP-A-57-2749 (JP, A) JP-A-58-14734 (JP, A) JP-A 61- 143128 (JP, A) JP 4-59227 (JP, A) JP 5-506821 (JP, A) JP 6-328566 (JP, A) JP 7-125069 (JP, A)

Claims (2)

(57) [Claims] 1. An outer surface of a tubular resin absorbent material obtained by abutting widthwise ends of resin absorbent material cut into strips and stitching the abutted portions with a highly airtight plastic tube. In the pipe lining material, the pipe lining material is characterized in that a thin resin absorbent material is intervened along the length direction at the seam portion of the tubular resin absorbent material. 2. A tubular resin absorbent material is obtained by stacking the resin absorbent material, which is cut into strips, with widthwise end portions sandwiching a thin resin absorbent material therebetween, and sewing the overlapped portions to obtain a tubular resin absorbent material. A method for producing a pipe lining material, which comprises coating an outer surface of a tubular resin absorbent material with a highly airtight plastic tube.