WO2020209000A1

WO2020209000A1 - Pipe lining material and production method therefor

Info

Publication number: WO2020209000A1
Application number: PCT/JP2020/011022
Authority: WO
Inventors: 和明小倉
Original assignee: 株式会社湘南合成樹脂製作所
Priority date: 2019-04-11
Filing date: 2020-03-13
Publication date: 2020-10-15
Also published as: KR20210136098A; KR102450177B1; TW202037480A; TWI816027B; JPWO2020209000A1

Abstract

In this invention, a tubular resin-absorbing material 13 at a terminal portion of a pipe lining material 10 has attached thereto a pull belt 14 that pulls a hot water hose 18 and extends from the pipe lining material terminal portion to the exterior. The pull belt and the terminal portion of the pipe lining material are covered by a seal tube 17 whereof the end portion 17a on the pull belt side is open, and the end portion 17b on other side is heat-welded onto the pipe lining material terminal portion. The tubular resin absorbing material 13 whereto the pull belt has been attached is woven in the width direction with a rope 15, which seals the terminal portion of the tubular resin absorbing material.

Description

Tube lining material and its manufacturing method

The present invention relates to a pipe lining material for pipeline rehabilitation made of a flexible tubular resin absorbent material and a method for manufacturing the same.

When existing pipes such as sewer pipes and water pipes buried in the ground deteriorate, a pipe lining material made of a tubular resin absorbent material impregnated with thermosetting resin is inverted and inserted into the existing pipe to insert the existing pipe. A rehabilitation method is known (Patent Document 1). The end of the pipe lining used in this method is closed by tightening bolts and nuts and is airtightly covered with a sealed tube. When the pipe lining material is inverted and inserted into the existing pipe, the hot water supplied from the hot water hose attached to the end is shuffled to the pipe lining material, and the thermosetting resin is heated and cured to heat and cure the existing pipe. Is lined.

Patent Document 1 describes, as a method of attaching a hot water hose to the end portion of a pipe lining material, a method of fixing a mounting belt to a bolt that closes the end portion of the pipe lining material and attaching the hot water hose via the mounting belt. Has been done. Further, in the same document, a method of attaching a hot water hose to a closed tube that airtightly seals the end portion of the pipe lining material, or in the case of a two-layer structure pipe lining material, the end portion of the tubular resin absorbent material of the outer layer is extended. It also describes how to attach a hot water hose to its end.

In Patent Document 2, in order to invert the pipe lining material, a pipe lining material having a certain length is drawn in through a slit-shaped inlet, the inlet is closed, the outlet is opened, and compressed air is chambered. A configuration is described in which the pipe lining material is fed into the existing pipe and inverted and inserted into the existing pipe. In this configuration, after the pipe lining material of a certain length is inverted and inserted into the existing pipe, the outlet is sealed, the inlet is opened, and a new pipe lining material of a certain length is drawn into the chamber. By repeating this operation, the pipe lining material can be continuously inverted and inserted into the existing pipe over a long distance.

Japanese Unexamined Patent Publication No. 2001-105495 Special Table 2012-516251

The thermosetting resin impregnated in the pipe lining material is cured by hot water supplied from a hot water hose attached to the end of the pipe lining material. As described in Patent Document 1, when the hot water hose is attached to a closed tube that seals the end of the pipe lining material, the strength is weak because the closed tube is made of plastic, and the hot water hose is towed. There is a problem that it is difficult. In addition, since the end of the pipe lining material is hermetically sealed by a sealed tube, there is a drawback that the air accumulated in the pipe lining material cannot be discharged at the time of reversal, and the pressure resistance at the time of reversing and curing of the pipe lining material is poor. There is also the problem.

In a configuration in which the end of the tubular resin absorbent material in the outer layer is extended with a two-layer pipe lining material and a hot water hose is attached to the end, the contact surface between the inner layer and the outer layer is a non-woven fabric, so the structure should be airtight. In addition to being difficult, there is a problem that the outer layer is weak in strength and it is difficult to pull the hot water hose.

In addition, when the mounting belt is fixed to a metal fitting such as a bolt used to close the end of the pipe lining and the hot water hose is attached via this mounting belt, the metal fitting obstructs the passage of the terminal of the pipe lining material. Therefore, there is a problem that it is difficult to smoothly insert the hot water hose into the existing pipe.

Therefore, the present invention has been made to solve such a problem, and the hot water hose can be reliably towed, the air accumulated in the pipe lining material can be discharged at the time of reversal, and the end of the pipe lining material can be discharged. An object of the present invention is to provide a pipe lining material capable of smoothly passing a portion through a slit-shaped seal opening and a method for manufacturing the same.

The present invention
It has a flexible tubular resin absorbent that can be impregnated with thermosetting resin and an airtight plastic film that covers the outer peripheral surface of the tubular resin absorbent, and is supplied from a hot water hose after being inverted and inserted into an existing pipe. A tube lining material in which a thermosetting resin is heated and cured by warm water.
A tow belt that pulls a hot water hose and extends outward from the end of the pipe lining material is attached to the tubular resin absorber at the end of the pipe lining material.
The tubular resin absorber to which the tow belt is attached is woven with a rope in the width direction, and the end portion of the tubular resin absorber is closed.
The end portion of the pipe lining material and the tow belt are characterized in that the end portion on the side of the tow belt is open and the other end portion is covered with a closed tube which is heat-welded to the end portion of the pipe lining material.

In addition, the present invention
It has a single-layer or multi-layer flexible tubular resin absorbent that can be impregnated with a thermosetting resin, and an airtight plastic film that covers the outer peripheral surface of the tubular resin absorbent, and after being inverted and inserted into an existing pipe, A method for producing a tube lining material in which a thermosetting resin is heated and cured by hot water supplied from a hot water hose.
In the case of a single-layer pipe lining material, a step of installing the tubular resin absorbent material in the tubular resin absorbent material at the end portion and cutting both sides in the width direction of the pipe lining material end portion,
The process of turning over the tubular resin absorbent material in the direction opposite to the end of the tube lining material to expose the internal tubular resin absorbent material,
A step of towing a hot water hose and attaching a tow belt extending outward from the end of the pipe lining material to the exposed tubular resin absorbent material.
The step of weaving the exposed tubular resin absorbent material with a rope in the width direction to close the tubular resin absorbent material, and
The process of turning over the turned-up tubular resin absorber to its original state and
A step of covering the end portion of the pipe lining material and the tow belt with a sealing tube opened by the tow belt side end portion, and heat-welding the other side end portion of the sealing tube and the pipe lining material end portion.
It is characterized by having.

In the present invention, since the tubular resin absorbent material is woven with a rope and closed, the surface of the end portion of the pipe lining material has less unevenness, and the end portion can have a flexible structure. As a result, the end portion of the pipe lining material can smoothly pass through the slit-shaped seal opening, so that the hot water hose connected to the end portion can be smoothly guided into the existing pipe. In addition, the end of the tow belt side of the sealed tube that seals the end of the pipe lining material is open, and the air mixed in the tubular resin absorber is discharged to the outside from the open end, so it can be used as a pipe lining material. The air pool is eliminated and the lining quality can be improved.

It is a perspective view which shows the appearance of the pipe lining material. It is the top view which looked at the state which made the tube lining material flat. It is sectional drawing which follows the AA line of FIG. 2a. It is a front view seen from the BB line of FIG. 2a. It is a top view of the pipe lining material when both sides of the end portion of the pipe lining material are cut. It is a top view which shows the exposed tubular resin absorbent material. It is sectional drawing which follows the CC line of FIG. 4a. It is a top view of the pipe lining material when the tow belt for pulling a hot water hose is attached to the tubular resin absorbent material. FIG. 5 is a cross-sectional view taken along the line DD of FIG. 5a. It is a top view when the exposed tubular resin absorbent material is woven with a rope. 6 is a cross-sectional view taken along the line EE of FIG. 6a. It is a top view when the end part of a pipe lining material and a tow belt are covered with a closed tube. FIG. 5 is a cross-sectional view taken along the line FF of FIG. 7a. It is explanatory drawing which shows the state which the pipe lining material is inverted and inserted into the existing pipe, and the pipe lining material is heated and hardened. It is a front view which shows the pipe lining material of a multilayer structure. It is sectional drawing which shows the state which attached the tow belt to the pipe lining material of a multilayer structure. It is the top view when the end part of the tube lining material of a multi-layer structure and the tow belt are covered with a closed tube. 11 is a cross-sectional view taken along the line GG of FIG. 11a.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached figures.

FIG. 1 shows a pipe lining material 10 for lining the inner wall surface of an existing pipe. The tube lining material 10 is made of a flexible tubular resin absorbent 11 and a highly airtight plastic film 12 such as polyethylene, polypropylene, nylon, or vinyl chloride that covers the outer peripheral surface (which becomes the inner peripheral surface after inversion). It has become.

The tubular resin absorbent 11 is a non-woven fabric using plastic fibers such as polyamide, polyester, or polypropylene, a woven fabric, or a mat, or a woven fabric using glass fibers, or a mat, or a non-woven fabric in which the above plastic fibers and glass fibers are combined. , A woven fabric, or a mat, a strip-shaped resin absorbent having a predetermined width and a predetermined length is rolled, and both end portions 11a thereof are abutted and sewn. A tape 11b made of polyurethane, polyethylene or polypropylene is adhered to the butt portion 11a, and the plastic film 12 is heat-welded to the entire outer peripheral surface of the rolled tubular resin absorbent material 11.

The tip portion 10a of the pipe lining material 10 is folded back and attached to a reversing nozzle of a reversing machine (not shown), and a tubular resin absorbing material 13 is inserted into the end portion 10b. The tubular resin absorbent 13 is woven with a rope and used to close the end portion 10b of the pipe lining material 10, and is also used to attach a tow belt that pulls a hot water hose, as will be described later. The tubular resin absorbent 13 is made of the same material as the tubular resin absorbent 12, is thinner than that, and is provided at the end portion 10b over a predetermined length in the pipe length direction. The tubular resin absorbent 13 is fixed at a plurality of locations on the tip portion 10a side of the tube lining material by heat welding or by using an adhesive or the like so as not to be displaced from the tubular resin absorbent 11.

FIG. 2a is a top view of the flattened pipe lining material 10, FIG. 2b is a cross-sectional view taken along the line AA of FIG. 2a, and FIG. 2c is a front view seen from the line BB of FIG. 2a. It is a figure. As can be seen from each figure, the tubular resin absorbent 13 is provided at the terminal portion 10b of the pipe lining material 10 toward the tip portion 10a over a predetermined length t1.

From FIG. 3, the process of processing the terminal portion 10b of the pipe lining material 10 is illustrated. In addition, the cross-sectional view shown in each figure is not an actual size but an enlarged view in the vertical direction in order to clearly show the cross-sectional structure.

As shown in FIG. 3, the terminal portion 10b of the pipe lining material 10 has a width of t2 in the length direction on both sides of the pipe lining material in the width direction (vertical direction in FIG. 3) in a state where the pipe lining material is flattened. It is cut diagonally with a length of w1 in the direction, and the cut surface is indicated by

reference numerals

10c and 10d. For example, when the pipe lining material 10 has a circular cross section and has a diameter of 200 mm and a thickness of 7.5 mm, the width w2 of the pipe lining material 10 is set to 270 mm in a flat state, t2 is set to 200 mm, and w1 is set to 80 mm. Will be done. Hereinafter, specific set values of various dimensions will be described with parentheses after the reference numerals, and the set values indicate values when the pipe lining material 10 has a diameter of 200 mm and a thickness of 7.5 mm.

As shown in FIGS. 4a and 4b, in the tube lining material 10, the outer tubular resin absorbent material 11 is turned over so that the inner tubular resin absorbent material 13 is exposed over a predetermined length.

As shown in FIGS. 5a and 5b, a long tow belt 14 for pulling the hot water hose is placed on the exposed tubular resin absorbent 13 in the center when viewed in the width direction of the pipe lining material 10. It is attached so as to extend to the outside of the material. The tow belt 14 is a belt-shaped belt having a length t6 (about 850 mm) and a width w3 (70 mm), which is made of polyester and has a tensile strength of 2 tons or more. The tow belt 14 is attached to the tubular resin absorbent material 13 by folding back and sewing one end 14a thereof, whereby the tow belt 14 is firmly attached to the tubular resin absorbent material 13. Further, in the tubular resin absorbent material 13, when viewed in the length direction of the pipe lining material, t3 (100 mm) from the inner end of the

cut surface

10c and 10d, and t4 (50 mm) from the end 14a to t4 (50 mm) of the tow belt 14. Rope braided holes 13a (10 in the embodiment) are formed on both sides of the tow belt 14 at a pitch of 20 mm.

As shown in FIGS. 6a and 6b, the tubular resin absorbent 13 is woven with a rope 15 made of PP (polypropylene) resin through a rope weaving hole 13a and closed. In the braiding with the rope 15, as shown in FIG. 6b, a space 13b is formed in the central portion of the tubular resin absorbent material 13, and the resin injection pipe 16 is inserted into this space 13b to form the tubular resin

absorbent materials

11 and 13. This is done so that the thermosetting resin can be impregnated. The tow belt 14 may be directly attached to the rope 15.

After the tubular resin absorbent 13 is woven with the rope 15, the tubular resin absorbent 11 is turned back to its original state. After that, as shown in FIGS. 7a and 7b, the end portion 10b of the pipe lining material 10 and the tow belt 14 have the same diameter as the outer diameter of the pipe lining material 10 and have a length extending outward from the end portion 10b. It is covered with a closed tube 17 of t5 (500 mm), for example, composed of three layers of PE (polyethylene), NY (nylon) and PE (polyethylene). This coating is performed by opening one end of the sealing tube 17 on the tow belt side as an open end 17a and heat-welding the other end 17b to the plastic film 12 of the pipe lining material end portion 10b to seal it airtightly. The length t5 of the sealing tube 17 extending outward from the end portion 10b of the pipe lining material is set to be a plurality of times the width w3 of the tow belt 14, for example, about 7 times or more.

After coating the closed tube 17, the end portion 10b of the pipe lining material 10 and the portion 17'shown by the alternate long and short dash line are cut off according to the shape of the tow belt 14. The portion indicated by the alternate long and short dash line that has been cut out and divided into two pieces is heat-welded and airtightly sealed so as to create a small space between the pipe lining material end portion 10b and the traction belt 14.

A loop 14b is formed at the other end of the tow belt 14, and a hot water hose 18 is attached to the tow belt 14 via a rope 19 attached to the loop 14b.

The

tubular resin absorbers

11 and 13 have thermosetting properties such as unsaturated polyester resin, vinyl ester resin, and epoxy resin before attaching the tow belt 14 and the sealing tube 17 or before attaching the hot water hose. The resin is impregnated. When the thermosetting resin is impregnated after the sealing tube 17 is attached, the resin injection pipe 16 is inserted into the space 13b of the tubular resin absorbent 13 from the open end 17a of the sealing tube 17 as shown in FIG. 6b. To impregnate the resin.

The pipe lining material 10 having the end portion processed in this way is attached to the reversing nozzle of the reversing machine (not shown) with the tip portion 10a folded back. When compressed air is applied to the pipe lining material 10, the pipe lining material 10 is inserted into the existing pipe while being inverted. As shown in FIG. 8, when the pipe lining material 10 is inverted and inserted until the hot water hose 18 protrudes from the end of the existing pipe 20, the air pressure is maintained and a large number in the length direction of the hot water hose 18 is maintained. Hot water is sprayed onto the pipe lining material 10 from the provided injection holes (not shown). By this spraying, the thermosetting resin impregnated in the

tubular resin absorbents

11 and 13 is cured, and then the portion protruding from the existing pipe 20 is cut, and the lining work is completed.

In the pipe lining material of this embodiment, the end portion is closed by knitting a tubular resin absorbent material with a rope instead of tightening bolts as in the conventional case, so that the end portion surface is uneven. Since there are no metal fittings such as bolts and nuts, the end part has a flexible structure, and it can be effectively used for a reversing device that reverses and inserts the pipe lining material by passing it through the slit-shaped seal opening. it can. Further, in the closing by knitting the rope, the rope 15 is a pipe lining material because the additional tubular resin absorbent material 13 inserted in the tubular resin absorbent material 11 is woven instead of the original tubular resin absorbent material 11 being woven. The above-mentioned effect can be further improved without being exposed to the outer surface of 10.

Further, in the conventional case, the end portion is closed by bolting by tightening two bolts, whereas in this embodiment, a plurality of rope knitting holes 13a are provided and tightly knitted by the rope 15 to form a pipe lining material. Since the end portion is closed, the pressure resistance of the pipe lining material can be improved.

Further, in this embodiment, the sealing tube 17 that seals the end portion 10b of the pipe lining material 10 has the tow belt side end portion open as an open end 17a, so that the

tubular resin absorbers

11 and 13 are impregnated with the resin. When the pipe lining material is inverted, the air mixed in is discharged from the ends of the

tubular resin absorbers

11 and 13 to the outside through the open end 17a of the sealing tube 17 due to the inverted air pressure as shown by the dotted arrows in FIG. It is discharged. As a result, the pipe lining material 10 has no air pool, so that the lining quality can be improved. Further, since the length t5 extending outward from the terminal portion 10b of the pipe lining material 10 of the closed tube 17 is long and the tow belt 14 is contained in this portion, the airtightness is improved and the pipe lining material 10 is inverted. At the time of curing, it is possible to obtain the effect that hot water and air are less likely to leak to the outside and the pressure resistance can be improved.

In Example 1, the pipe lining material 10 was a single-layer tubular resin absorbent material, but the pipe lining material may be made of a multi-layer tubular resin absorbent material. Such a tube lining material is shown in FIG. The tube lining material 30 has two layers, a tubular resin absorbent material 31 as an outer layer and a tubular resin absorbent material 33 as an inner layer, and a plastic film 32 of the same material as the plastic film 12 is provided on the entire outer peripheral surface of the tubular resin absorbent material 31. Is heat welded. The

tubular resin absorbents

31 and 33 both have the same length in the longitudinal direction, are made of the same material as the tubular resin absorbent 11 of the tube lining material 10, and have the same layer thickness, and any of the

tubular resin absorbents

31 and 33 has the same layer thickness. Has a structure that can be impregnated with a thermosetting resin.

The diameter of the tubular resin absorbent material 33 is set so that there is no gap between the layers of the tubular resin

absorbent material

31 and 33 when the pipe lining material 30 is expanded in a circular cross section, and the tubular resin

absorbent materials

31 and 33 are set to each other. It is fixed by adhesive or heat welding at multiple locations so that it does not shift. When the tube lining material 30 is folded flat, the tubular resin absorbent material 33 has a smaller diameter than the tubular resin absorbent material 31, so that the tubular resin absorbent material 33 has a bent portion 33a as shown in FIG. It can be folded in the state.

In this way, even with the multi-layered pipe lining material 30, the end portion can be processed in the same manner as with the single-layer pipe lining material 10. Similar to the first embodiment, the terminal portion of the pipe lining material 30 is cut on both sides in the width direction of the pipe lining material 30 in a flat state, and the tubular resin absorbent 33 of the inner layer has a predetermined length. The tubular resin absorbent 31 in the outer layer is turned over so as to be exposed across.

As shown in FIG. 10, a tow belt 14 is sewn on the exposed upper portion of the tubular resin absorbent 33 by folding back one end 14a at the center in the width direction of the pipe lining material 30. Further, the tubular resin absorbent material 33 is woven with a rope 15 at the same place as the tubular resin absorbent material 13 of the first embodiment, and the end portion thereof is closed. In the braiding with the rope 15, a space is created in the central portion of the tubular resin absorbent material 33 as in the first embodiment, and the resin injection pipe 16 is inserted into this space, and the thermosetting resin is inserted into the tubular resin

absorbent materials

31 and 33. Is done so that it can be impregnated.

After that, the tubular resin absorbent 31 is turned over to the original state as in the first embodiment. As shown in FIGS. 11a and 11b, one end of the end portion 30b and the tow belt 14 of the pipe lining material 30 is opened as an open end 17a and the other end 17b is the end portion of the pipe lining material, as in the first embodiment. It is covered with a closed tube 17 that is heat welded to 30b. In the airtight tube 17, the portion 17'shown by the alternate long and short dash line is cut off according to the shape of the end portion 30b of the pipe lining material 30 and the tow belt 14, and the portion indicated by the alternate long and short dash line is cut out and divided into two pieces. , It is heat-welded and airtightly sealed so that a small space is formed between the pipe lining material end portion 30b and the traction belt 14.

In Example 2, the same effect as in Example 1 can be obtained. In the second embodiment, since the structure is multi-layered, the tow belt can be attached by using the tubular resin absorbent material in the inner layer. Therefore, as in the first embodiment, the tubular resin absorbent material 13 for attaching the tow belt. There is an advantage that there is no need to interpolate. When the pipe lining material has a multi-layer structure of two or more layers, the tow belt is attached to the tubular resin absorbent material of the inner layer adjacent to the outermost layer.

10

Tube lining material

11, 13 Tubular resin absorber 12 Plastic film 14 Tow belt 15 Rope 16 Resin injection pipe 17 Sealed tube 18 Hot water hose 20 Existing pipe 30

Tube lining material

31, 33 Tubular resin absorber

Claims

It has a flexible tubular resin absorbent that can be impregnated with thermosetting resin and an airtight plastic film that covers the outer peripheral surface of the tubular resin absorbent, and is supplied from a hot water hose after being inverted and inserted into an existing pipe. A tube lining material in which a thermosetting resin is heated and cured by warm water.
A tow belt that pulls a hot water hose and extends outward from the end of the pipe lining material is attached to the tubular resin absorber at the end of the pipe lining material.
The tubular resin absorber to which the tow belt is attached is woven with a rope in the width direction, and the end portion of the tubular resin absorber is closed.
The pipe lining material, wherein the end portion of the pipe lining material and the tow belt are covered with a closed tube in which the end portion on the tow belt side is open and the other end portion is heat-welded to the end portion of the pipe lining material.
The tubular resin absorbent material is composed of a single layer, the tubular resin absorbent material is interpolated inside the tubular resin absorbent material of the single layer, and a tow belt is attached to the interpolated tubular resin absorbent material. The pipe lining material according to claim 1, which is characteristic.
The pipe lining material according to claim 1, wherein the tubular resin absorbent material is composed of multiple layers, and a tow belt is attached to the tubular resin absorbent material in the inner layer.
The pipe lining according to any one of claims 1 to 3, wherein the knitting with the rope is performed so as to form a space for inserting the resin injection pipe in the central portion when viewed in the width direction. Material.
The sealed tube has a shape corresponding to the shape of the end portion of the pipe lining material and the tow belt, and is heat-welded so as to create a space between the closed tube and the tow belt. The pipe lining material according to any one of the above items.
The pipe lining material according to any one of claims 1 to 5, wherein the length extending outward from the end portion of the pipe lining material of the tow belt is a plurality of times longer than the width of the tow belt.
It has a single-layer flexible tubular resin absorber that can be impregnated with thermosetting resin, and an airtight plastic film that covers the outer peripheral surface of the tubular resin absorber. After being inverted and inserted into the existing pipe, a hot water hose This is a method for producing a tube lining material in which a thermosetting resin is heated and cured by hot water supplied from.
A process of installing a tubular resin absorbent material inside the tubular resin absorbent material at the end of the pipe lining material and cutting both sides in the width direction of the terminal part of the pipe lining material.
The process of turning over the tubular resin absorbent material in the direction opposite to the end of the tube lining material to expose the internal tubular resin absorbent material,
A step of towing a hot water hose and attaching a tow belt extending outward from the end of the pipe lining material to the exposed tubular resin absorbent material.
The step of weaving the exposed tubular resin absorbent material with a rope in the width direction to close the tubular resin absorbent material, and
The process of turning over the turned-up tubular resin absorber to its original state and
A step of covering the end portion of the pipe lining material and the tow belt with a sealing tube opened by the tow belt side end portion, and heat-welding the other side end portion of the sealing tube and the pipe lining material end portion.
A method for manufacturing a tube lining material, which comprises.
It has a multi-layered flexible tubular resin absorber that can be impregnated with thermosetting resin, and an airtight plastic film that covers the outer peripheral surface of the tubular resin absorber. After being inverted and inserted into an existing pipe, warm water is used. A method for producing a tube lining material in which a thermosetting resin is heated and cured by hot water supplied from a hose.
The process of cutting both sides of the end of the pipe lining material in the width direction,
The process of turning over the outer layer of the tubular resin absorbent material in the direction opposite to the end of the tube lining material to expose the tubular resin absorbent material of the inner layer,
A step of pulling a hot water hose and attaching a tow belt extending to the outside from the end of the pipe lining material to the exposed inner layer tubular resin absorbent material.
A step of knitting the exposed inner layer tubular resin absorbent material with a rope in the width direction and closing the tubular resin absorbent material.
The step of turning over the tubular resin absorbent material of the outer layer to the original state and
A step of covering the end portion of the pipe lining material and the tow belt with a sealing tube opened by the tow belt side end portion, and heat-welding the other side end portion of the sealing tube and the pipe lining material end portion.
A method for manufacturing a tube lining material, which comprises.
The method for manufacturing a pipe lining material according to claim 7 or 8, wherein the knitting with the rope is performed so that a space into which the resin injection pipe can be inserted is formed in the central portion when viewed in the width direction.
The sealed tube has a shape corresponding to the shape of the end portion of the pipe lining material and the tow belt, and is heat-welded so as to create a space between the closed tube and the tow belt. The method for producing a tube lining material according to any one item.