JP2815333B2 - Branch pipe lining material and pipe lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe lining material for lining the inner peripheral surface of a branch pipe, and a pipe lining method constructed by using the branch pipe lining material.

[0002]

2. Description of the Related Art When a pipe such as a sewer pipe buried in the ground is deteriorated, a pipe lining method for repairing the pipe by lining its inner peripheral surface without excavating the pipe is known. It has been proposed and is already in practical use.

In the pipe lining method, a pipe lining material obtained by impregnating an uncured curable resin into a tubular resin absorbent whose outer peripheral surface is coated with a highly airtight film is inverted and inserted into a pipe by fluid pressure. Then, while pressing the inverted pipe lining material against the inner circumferential surface of the pipe, the curable resin impregnated in the pipe lining material is cured, and the inner circumferential surface of the pipe is lined with the hardened pipe lining material. Then, the pipe is repaired.

The above-mentioned pipe lining method can be similarly applied to a main pipe such as a sewer pipe and a branch pipe which joins the main pipe.

[0005] As a branch pipe lining material for lining a branch pipe, the one shown in FIG. 11 has been proposed. That is, FIG. 11 is a perspective view in which a part of the conventional branch pipe lining material 101 is cut away.
Has a tubular resin absorbent 104 made of a nonwoven fabric such as polyester, the outer peripheral surface of which is coated with a highly airtight plastic film.
Is impregnated with an uncured liquid curable resin.

[0006] One end of the tubular resin absorbent member 104 is bent outward to form a flange portion 105. The flange portion 105 has an arc substantially equal to the curvature of a main pipe 110 (see FIG. 12) described later. It is curved in a curved shape, and its outer diameter is set to be larger than the inner diameter of a branch pipe 111 (see FIG. 12) described later. The flange 105 retains the above-described arcuate curved surface shape by curing the curable resin impregnated therein.

Here, a pipe lining method using the branch pipe lining material 101 will be described with reference to FIGS. 12 to 14 are sectional views showing a conventional pipe lining method in the order of steps.

In FIG. 12, reference numeral 110 denotes a main pipe, and 111 denotes a small-diameter branch pipe which joins the main pipe 110.
Inside, a work robot 11 that is pre-assembled and integrated on the ground
2. The pressure bag 113, the branch pipe lining material 101, and the like are introduced and set.

The head 114 of the working robot 112
Is provided with a set nozzle 116, and the flange 10 of the branch pipe lining material 101 is provided on the set nozzle 116.
5 is fixedly set, and the flange portion 1 of the branch pipe lining material 101 is provided.
The portion other than 05 (the non-reversed portion) is accommodated in the pressure bag 113 as shown.

While monitoring the inside of the main pipe 110 and the inside of the branch pipe 111 on the ground with the TV camera 115 installed in the work robot 112 and the TV camera 140 introduced into the branch pipe 111, respectively, Lining material 1
01 is positioned at the branch pipe opening 110a of the main pipe 110, and then the head 114 of the working robot 112 is positioned.
Is moved upward, and the flange portion 10 of the branch pipe lining material 101 is moved.
5 is pressed against the peripheral edge of the branch pipe opening 110a of the main pipe 110 to make it closely adhere.

Next, by driving a compressor (not shown) installed on the ground to supply compressed air into the pressure bag 113 via the air hose 118, as shown by a broken line in FIG. The material 101 is inserted into the branch pipe 111 toward the ground in the direction indicated by the arrow while being inverted under the pressure of the compressed air.

Thus, the branch pipe 1 of the branch pipe lining material 101
11 is completed, the branch pipe lining material 1
01 is pressed against the inner peripheral surface of the branch pipe 111, and the curable resin impregnated therein is cured by an arbitrary method. Therefore, the branch pipe 111 is hardened by the hardened branch pipe lining material 101. The peripheral surface is lined and repaired.

When the lining of the branch pipe 111 is completed as described above, the lining of the main pipe 110 is performed in the following manner.

That is, as shown in FIG. 13, a main pipe lining material 125 is reversely inserted into the main pipe 110 by compressed air pressure. The main pipe lining material 125 is formed by impregnating a curable resin into a tubular resin absorbent material like the branch pipe lining material 101, and at least the outer peripheral surface of the resin absorbent material before inversion has high airtightness. The plastic film is covered.

As described above, the main pipe lining material 125
When the inverted insertion of the main pipe 110 into the main pipe 110 is completed over the entire length of the main pipe 110, the hardening impregnated in the main pipe lining material 125 is performed while the main pipe lining material 125 is pressed against the inner peripheral surface of the main pipe 110. When the conductive resin is cured by an arbitrary method, the main pipe 110 is repaired by lining its inner peripheral surface with the cured main pipe lining material 125. still,
When the main pipe lining material 125 is hardened, the main pipe lining material 125 oozes out from the main pipe lining material 125 and is hardened.
The curable resin adhering to the flange 105 is also cured at the same time, so that the flange 105 of the branch pipe lining material 101 and the main pipe lining material 125 are joined and integrated.

When the lining of the main pipe 110 is completed in the above manner, as shown in FIG. 14, the cutter 138 attached to the tip of the work robot 137 introduced into the main pipe 110 is driven to rotate, and While monitoring the inside of the main pipe 110 with the TV camera 139 installed on the robot 137, the portion of the main pipe lining material 125 covering the branch pipe opening 110 a is cut off by the cutter 138, and the branch pipe 111 is opened into the main pipe 110. At least the branch pipe 11
1 and the main pipe 110 are communicated.

[0017]

However, in the conventional branch pipe lining material 101 described above, the flange 105 is cured in advance and is not impregnated with an uncured curable resin. If the curable resin that oozes out of the lining material 125 and adheres to the flange portion 105 is hardened, the flange portion 105 and the main pipe lining material 125 are not securely joined and integrated, and a gap is generated between the two. However, problems such as infiltration of groundwater or the like into the main pipe 110 through the gap have occurred.

Accordingly, it is an object of the present invention to provide a branch pipe lining material and a pipe lining method capable of reliably joining and integrating the flange portion of the branch pipe lining material with the main pipe lining material. It is in.

In the operation of cutting a part of the main pipe lining material 125 by using the cutter 138, since there is no clear mark indicating the cut position, the cutter 13
There is also a problem that it is difficult to position the 8 and it is difficult to perform accurate cutting.

Therefore, the object of the present invention is to easily cut off the portion covering the branch pipe opening of the main pipe lining,
Another object of the present invention is to provide a branch pipe lining material and a pipe lining method that can be performed accurately.

[0021]

In order to achieve the above object, according to the first aspect of the present invention, an uncured curable resin is impregnated in a tubular resin absorbent having a cured flange formed at one end. In the branch pipe lining material configured, a plurality of holes are formed in the flange portion of the tubular resin absorbent material, and at least some of the holes are passed through the string-shaped resin absorbent material so that adjacent holes are connected to the string-shaped resin absorbent material. It is characterized by being connected by lumber.

According to a second aspect of the present invention, in the first aspect of the present invention, the plurality of holes are formed on concentric circles along the inner periphery of the flange portion of the tubular resin absorbent material, and the plurality of holes are formed in the holes. The adjacent holes are connected by the string-shaped resin absorbent through the resin absorbent.

According to a third aspect of the present invention, an uncured curable resin is impregnated in a tubular resin absorbent material having a cured flange portion formed at one end, and a plurality of holes are formed in the tubular resin absorbent material. A branch pipe lining material, which is formed by drilling and connecting adjacent holes with the string-shaped resin absorbent material through at least some of the holes through the string-shaped resin absorbent material, is inserted into the main pipe and set therein; With the flange of the lining material pressed against the periphery of the branch pipe opening of the main pipe, the same branch pipe lining material is invertedly inserted into the branch pipe from the main pipe side to the ground by fluid pressure, and then the branch pipe lining material is removed. While pressing the inner wall of the branch pipe, the curable resin impregnated in the branch pipe lining material is cured, and then the tubular resin absorbent material is impregnated with the curable resin. After inverted insertion into the pipe, the main pipe lining material While pressed against the inner peripheral surface of the main pipe, it allowed to cure the curable resin impregnated in the main pipe liner bag,
A portion of the hardened main pipe lining material that blocks the branch pipe opening is cut off.

According to a fourth aspect of the present invention, in the third aspect of the invention, the plurality of holes are formed on a concentric circle along an inner periphery of a flange portion of the branch pipe lining material, and the plurality of holes are formed in the holes. The adjacent holes are connected by the string-shaped resin absorbent through the resin absorbent.

Therefore, according to the pipe lining method according to the third aspect, which is performed using the branch pipe lining material according to the first aspect, a plurality of holes are formed in the flange portion of the tubular resin absorbent constituting the branch pipe lining material. Since the adjacent holes were connected to each other with the string-shaped resin absorbent material through at least a part of the holes through the string-shaped resin absorbent material, the uncured curable resin that leaked out of the main pipe lining material was removed. It is impregnated with a string-shaped resin absorbent and hardens,
As a result, the flange portion of the branch pipe lining material and the main pipe lining material are more firmly joined and integrated, and no gap is generated between them.

According to the pipe lining method according to the fourth aspect, which is performed using the branch pipe lining material according to the second aspect, the inner circumference of the flange portion of the tubular resin absorbent constituting the branch pipe lining material. A plurality of holes were drilled on concentric circles along the line, and the adjacent holes were connected to each other with the string-shaped resin absorbent material through the string-shaped resin absorbent material. When the lining is performed, the periphery of the branch pipe opening of the main pipe lining material is swelled by the string-shaped resin absorbing material. Therefore, while positioning the cutter using the swelling as a mark, the branch pipe opening of the main pipe lining material is reduced. The part covering the part can be easily and accurately cut off.

[0027]

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

FIG. 1 is a partially cutaway perspective view showing a branch pipe lining material according to the present invention, FIG. 2 is an enlarged sectional view taken along line AA of FIG. 1, and FIG. 2 is a flange portion of the branch pipe lining material. Plan view, FIG. 4
FIG. 4 is an enlarged sectional view taken along line BB of FIG. 3.

The lateral pipe lining material 1 according to the present invention has a plastic film 2, 3 of which outer peripheral surface is highly airtight.
It has a tubular resin absorbent material 4 made of a nonwoven fabric such as polyester, polypropylene, acrylic or the like coated with (see FIG. 2). The tubular resin absorbent material 4 is impregnated with an uncured liquid thermosetting resin. I have. The materials of the plastic films 2 and 3 are polyurethane, polyethylene,
A polyethylene / nylon copolymer, vinyl chloride, or the like is used, and a polyester resin, an epoxy resin, a vinyl ester resin, or the like is used as the thermosetting resin.

One end of the tubular resin absorbent material 4 is
As shown in FIG. 5, the flange 5 is formed by being folded outward, and has a shape curved into an arc-shaped curved surface substantially equal to the curvature of a main pipe 10 (see FIG. 5) described later. The outer diameter is set to be larger than the inner diameter of a branch pipe 11 (see FIG. 5) described later. The flange portion 5 retains the above-described arcuate curved surface shape by curing the curable resin impregnated therein.

Thus, the branch pipe lining material 1 according to the present invention
As shown in FIG. 3, the flange 5 has three concentric circles C1, C2, and C3, each of which has a plurality of circular holes 6, 7, and 8 formed at an equal angular pitch. As shown in FIG. 4, a string-shaped resin absorbent material 9 is passed through a plurality of circular holes 6 formed on a concentric circle C1 along the inner periphery of 5, and adjacent circular holes 6 are formed in a string-like shape. They are connected to each other by a resin absorbent 9.

Similarly, a plurality of circular holes 8 formed on a concentric circle C3 along the outer periphery of the flange portion 5 are also provided with a string-shaped resin absorbing material 9, and the adjacent circular holes 8 are connected to each other by a string-shaped resin. They are connected to each other by the absorber 9.

Therefore, the string-shaped resin absorbing material 9 appears over both surfaces of the flange 5. The string-shaped resin absorbent 9 is made of the same material as the tubular resin absorbent 4, but the resin absorbent 9 is not impregnated with a thermosetting resin.

Next, a pipe lining method according to the present invention, which is constructed using the branch pipe lining material configured as described above, will be described with reference to FIGS. 5 to 10 are sectional views showing the pipe lining method according to the present invention in the order of steps.

In FIG. 5, 10 is the main pipe, and 11 is the main pipe 1.
In the main pipe 10, a working robot 12, a pressure bag 13, a branch pipe lining material 1, and the like, which are previously assembled and integrated on the ground, are introduced and set in the main pipe 10.

The work robot 12 is driven by hydraulic pressure so that its head 14 moves back and forth in the directions of arrows aa 'and bb' in FIG. 5, and rotates in the direction of cc '. A TV camera 15 for monitoring is installed on the upper part.

A set nozzle 16 is attached to the head 14 of the working robot 12. The flange 5 of the branch pipe lining material 1 is fixedly set on the set nozzle 16. The portion excluding the flange portion 5 (unreversed portion) is accommodated in the pressure bag 13 as shown in FIG.

On the other hand, the pressure bag 13 is closed at one end by a cup 17.
The other end opening is attached to the cylindrical portion 16a of the set nozzle 16 as shown. The pressure bag 13 is connected to the air hose 18 connected to the cup 17.
Is connected to a compressor 19 installed on the ground.

While monitoring the inside of the main pipe 10 on the ground by the TV camera 15 installed on the working robot 12, the flange 5 of the branch pipe lining material 1 is
After being positioned at the branch pipe opening 10a of the main pipe 10, the head 14 of the working robot 12 is moved in the direction of arrow b (upward) in FIG. It is pressed against the peripheral edge of the portion 10a to make it closely contact.

Next, by driving the compressor 19 installed on the ground to supply compressed air into the pressure bag 13 through the air hose 18, the branch pipe lining material is obtained as shown by the broken line in FIG. 1 is inserted into the branch pipe 11 from the main pipe 10 side toward the ground in the direction indicated by the arrow while being inverted under the pressure of the compressed air.

When the inverted insertion of the branch pipe lining material 1 into the branch pipe 11 is completed, a cup 20 is attached to the upper end of the branch pipe lining material 1 and connected to the cup 20 as shown in FIG. The compressed air is supplied into the branch pipe lining material 1 from the air hose 21 thus pressed, and the branch pipe lining material 1 is pressed against the inner peripheral surface of the branch pipe 11. Then, while maintaining this state, the hot water pump 22 is driven to supply the hot water in the hot water tank 23 into the branch pipe lining material 1 via the hot water hose 24, and the thermosetting impregnated in the branch pipe lining material 1 The resin is cured by heating, and the branch pipe 11 is repaired by lining its inner peripheral surface with the cured branch pipe lining material 1.

Thereafter, the hot water in the branch pipe lining material 1 is drained, the head 14 of the work robot 12 is moved in the direction of arrow b '(downward) in the figure, and the set nozzle 16 is detached from the branch pipe lining material 1. When the work robot 12 is moved in the main pipe 10 and removed from the main pipe 10, the pressure bag 13 attached to the set nozzle 16 is also removed from the main pipe 10 together with the work robot 12, and the branch pipe is placed there. A series of lining operations for 11 is completed.

When the lining of the branch pipe 11 is completed, the lining of the main pipe 10 is performed in the following manner.

That is, as shown in FIG. 7, one end of the main pipe lining material 25 is attached to the outer periphery of the lower end opening of the pressure vessel 26, and the compressor 27 installed on the ground is driven to generate compressed air. When the main pipe lining material 25 is supplied from the pipe 28 into the pressure vessel 26, the main pipe lining material 25 is inserted into the main pipe 10 in the direction indicated by the arrow in FIG. The main pipe lining material 25 is formed by impregnating a thermosetting resin into a tubular resin absorbent like the branch pipe lining material 1. At least the outer peripheral surface of the resin absorbent before inversion is airtight. Tall plastic film is coated. Further, as shown in FIG. 7, a pressure gauge 29 and a valve 30 are mounted in the middle of the pipe 28.

A hot water hose 31 is attached to the end of the main pipe lining material 25, and the main pipe lining material 25 is inserted upside down into the main pipe 10 over its entire length as shown in FIG. Then, the hot water hose 31 is drawn into the main pipe lining material 25 and the pressure vessel 26. A plurality of injection ports (not shown) for discharging hot water are formed at appropriate intervals in a portion of the hot water hose 31 facing the main pipe lining material 25.

As shown in FIG. 8, a hot water pump 32 is provided on the ground, and a hot water discharge pipe 33 attached to a lower portion of the pressure vessel 26 is connected to a suction side of the hot water pump 32. I have. The discharge side of the hot water pump 32 is connected to a boiler 34, and the hot water hose 31 is connected to the boiler 34. A thermometer 35 and a valve 36 are mounted in the middle of the hot water hose 31.

When the main pipe lining material 25 and the pressure vessel 26 are filled with compressed air and the main pipe lining material 25 is pressed against the inner peripheral wall of the main pipe 10, the main pipe lining material 25 is impregnated. Part of the uncured thermosetting resin that has leaked out flows into the plurality of circular holes 6, 7, 8 formed in the flange portion 5 of the branch pipe lining material 1, and absorbs string-like resin. Material 9 is impregnated.

While maintaining the above state, the hot water pump 3
When the boiler 34 and the boiler 34 are driven, the hot water heated to a predetermined temperature by the boiler 34 flows through the hot water hose 31 in the direction of the arrow in FIG. 8 and is ejected from a plurality of injection ports formed in the hot water hose 31. Then, the main pipe lining material 25 is subjected to hot water showering from the inside, and the thermosetting resin impregnated in the main lining material 25 is heated by the hot water to be hardened, and the main pipe lining material 25 is hardened.
Is repaired by lining its inner peripheral surface with the cured main pipe lining material 25.

When the main pipe lining material 25 is cured, a plurality of circular holes 6, which exude from the main pipe lining material 25 and are formed in the flange 5 of the branch pipe lining material 1.
Since the thermosetting resin flowing into the tubes 7 and 8 and the thermosetting resin impregnated in the string-shaped resin absorbent material 9 are also cured at the same time, the flange portion 5 of the branch pipe lining material 1 and the main pipe lining material 25 are more likely to be hardened. It is firmly joined and integrated, and the generation of a gap between the two is reliably prevented.

When the lining of the main pipe 10 is completed in the above manner, as shown in FIG. 9, the cutter 38 attached to the tip of the work robot 37 introduced into the main pipe 10 is driven to rotate, and the work robot 37 is rotated. TV set in
While monitoring the inside of the main pipe 10 and the inside of the branch pipe 11 with the camera 39 and the TV camera 40 introduced into the branch pipe 11, respectively, the portion covering the branch pipe opening 10a of the main pipe lining material 25 is cut off by the cutter 38. Then, the branch pipe 11 is opened into the main pipe 10 so that the branch pipe 11 communicates with the main pipe 10.

In this embodiment, a plurality of holes 6 are formed on a concentric circle C1 along the inner periphery of the flange 5 of the lateral pipe lining material 1, and a string-like resin absorption is formed in the holes 6. Since the adjacent holes 6 are connected to each other by the string-shaped resin absorbent material 9 through the material 9, as shown in FIG. 9, the periphery of the branch pipe opening 10 a of the main pipe lining material 25 has a string-shaped resin absorbent material 9. Therefore, the portion covering the branch pipe opening 10a of the main pipe lining material 25 can be easily and accurately cut off while positioning the cutter 38 using the swelling as a mark.

When the cutting operation of the main pipe lining material 25 is completed as described above, as shown in FIG.
The main pipe 10 is lined and repaired by the branch pipe lining material 1 and the main pipe lining material 25, respectively, and the flange 5 of the branch pipe lining material 1 and the main pipe lining material 10 are securely joined and integrated as described above. Therefore, there is no problem that a gap is generated between the two and groundwater or the like intrudes from the gap.

[0053]

As is apparent from the above description, claim 1
According to the pipe lining method according to claim 3, which is constructed using the branch pipe lining material described above, a plurality of holes are formed in the flange portion of the tubular resin absorbent material constituting the branch pipe lining material, and at least a part thereof is formed. Since the adjacent holes were connected to each other with the string-shaped resin absorbent through the string-shaped resin absorbent, the uncured curable resin that oozed out of the main pipe lining material impregnated the string-shaped resin absorbent. As a result, the flange portion of the branch pipe lining material and the main pipe lining material are more firmly joined and integrated, and the effect of reliably preventing the generation of a gap between the two can be obtained. Can be

According to the pipe lining method according to the fourth aspect, which is performed using the branch pipe lining material according to the second aspect, the inner periphery of the flange portion of the tubular resin absorbent constituting the branch pipe lining material. A plurality of holes were drilled on concentric circles along the line, and the adjacent holes were connected to each other with the string-shaped resin absorbent material through the string-shaped resin absorbent material. When the lining is performed, the periphery of the branch pipe opening of the main pipe lining material is swelled by the string-shaped resin absorbing material. Therefore, while positioning the cutter using the swelling as a mark, the branch pipe opening of the main pipe lining material is reduced. The effect that the part covering the part can be easily and accurately cut off is obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a branch pipe lining material according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is a plan view of a flange portion of the lateral pipe lining material according to the present invention.

FIG. 4 is an enlarged sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view showing a pipe lining method according to the present invention.

FIG. 6 is a sectional view showing a pipe lining method according to the present invention.

FIG. 7 is a sectional view showing a pipe lining method according to the present invention.

FIG. 8 is a sectional view showing a pipe lining method according to the present invention.

FIG. 9 is a sectional view showing a pipe lining method according to the present invention.

FIG. 10 is a sectional view showing a pipe lining method according to the present invention.

FIG. 11 is a partially cutaway perspective view of a conventional branch pipe lining material.

FIG. 12 is a sectional view showing a conventional pipe lining method.

FIG. 13 is a sectional view showing a conventional pipe lining method.

FIG. 14 is a sectional view showing a conventional pipe lining method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Branch pipe lining material 4 Tubular resin absorber 5 Flange 6-8 Circular hole (hole) 9 String-shaped resin absorber 10 Main pipe 10a Branch pipe opening of main pipe 11 Branch pipe 25 Main pipe lining material

Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 23:00 (72) Inventor Yasuhiro Yokoshima 175-3 Sasayama, Ishishita-cho, Yuki-gun, Ibaraki Pref. Limited company Yokoshima (72) Inventor Hiroyuki Aoki Saitama (56) References JP-A-4-355116 (JP, A) JP-A-62-279924 (JP, A) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B29C 63/00-63/48 F16L 1/00 F16L 55/16-55/18

Claims (4)

(57) [Claims] 1. A branch pipe lining material formed by impregnating an uncured curable resin into a tubular resin absorbent material having a cured flange portion formed at one end, wherein the tubular resin absorbent material has a plurality of flange portions. Characterized in that at least some of the holes are penetrated, and adjacent holes are connected to each other through the string-shaped resin absorbing material through a string-shaped resin absorbing material. 2. A plurality of holes are formed on concentric circles along an inner periphery of a flange portion of the tubular resin absorbent material, and adjacent holes are passed through the holes through the resin resin material in the form of a string. The branch pipe lining material according to claim 1, wherein the branch pipe lining material is connected with a resin absorbent material. 3. An uncured curable resin is impregnated into a tubular resin absorbent material having a cured flange formed at one end, and a plurality of holes are formed in the tubular resin absorbent material. The branch pipe lining material, which is formed by connecting the adjacent holes with the string-shaped resin absorbent material through the string-shaped resin absorbent material into the holes of the part, is inserted and set in the main pipe, and the flange portion of the branch pipe lining material is removed. In a state where the branch pipe lining material is pressed against the periphery of the branch pipe opening portion, the branch pipe lining material is invertedly inserted from the main pipe side toward the ground into the branch pipe by fluid pressure, and then the branch pipe lining material is placed on the branch pipe inner peripheral surface. While pressing, the curable resin impregnated in the branch pipe lining material is cured, and then the main pipe lining material obtained by impregnating the curable resin into the tubular resin absorbent material is inverted and inserted into the main pipe by fluid pressure. Pressing the main pipe lining material against the inner peripheral surface of the main pipe. A pipe lining method characterized by curing the curable resin impregnated in the main pipe lining material while removing the portion of the hardened main pipe lining material that closes the branch pipe opening. 4. A plurality of holes are formed on a concentric circle along an inner periphery of a flange portion of the branch pipe lining material, and the adjacent holes are passed through the string-shaped resin absorbing material to form the string-like holes. The pipe lining method according to claim 3, wherein the pipe lining is connected by a resin absorbent.