JPH10286879A - Device and method for lining branched pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for lining a branched pipeline in which the device is compact and easily passed through a main pipe and lining material is smoothly turned over and inserted into the branched pipeline and lining is performed. SOLUTION: An inscribed plate 9 separated and touched from/to a main pipe 15 is provided to the body 2 passing through the main pipe 15. A pressure resistant tube 13 is fixed to the inscribed plate 9. The inscribed plate 9 has a curved surface comformable to the shape of the inner face of the main pipe 15 and has a guide hole of diameter nearly equal to the inside diameter of a branched pipeline 14. When internal pressure equal to pressure of inversion time of lining material 18 is allowed to act, the pressure resistant tube 13 is extended at least in the lengthwise direction and also one end thereof is annularly connected with the circumferential edge of the guide hole of the inscribed plate 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a gas pipe, a water pipe,
The present invention relates to a method and an apparatus for applying a lining to a branch pipe branched from a main pipe to a pipe mainly buried in the ground, such as a pipe for laying a sewer pipe or a power line or a communication line, In particular, the branch pipe is lined from inside the main pipe by the inverted insertion method.

[0002]

2. Description of the Related Art Conventionally, in a pipeline having such a branch, when lining the branch pipeline, it has been practiced to insert a lining material from a terminal side of the branch pipeline by an inverted insertion method. However, in this method, it was difficult to treat the tip of the lining material at a branch point from the main pipe.

In view of the above, it is conceivable to insert a lining material from the main pipe side into the branch conduit by inverting insertion to line the inside. A method and an apparatus described in Japanese Patent Application Laid-Open No. Hei 6-210732 are known. Have been.

In this apparatus, a lining work tool pressed against the inner surface of a main pipe is attached to an automatic traveling vehicle running in a pipe,
A curved tubular holding portion is provided on the lower surface of the inscribed plate of the lining work tool, an outer tube is attached to the holding portion, and the collar formed at the end of the lining material accommodated in the outer tube is attached to the inner tube. The tubing is sandwiched and supported between the plate and the inner surface of the main pipe, and a fluid pressure is applied to the outer wrapping tube to insert the lining material upside down into the branch conduit.

[0005]

However, according to the present invention, the lining material disposed in the main pipe in the axial direction is bent at the inner plate by about 90 ° in the axial direction of the branch pipe. In order to induce the bending, it is necessary to form a holding portion which is approximately the same diameter as the lining material and which is curved by about 90 ° on the lower surface of the inscribed plate.
For this reason, the holding portion protrudes greatly below the inscribed plate, and the device occupies a large space in the main pipe, and it becomes difficult to proceed in the main pipe.

[0006] The outer tube can be bent at the inner plate and attached, but when the lining material is inverted and inserted, an inner pressure acts on the outer tube, so that the outer tube tends to expand in a cylindrical shape and straighten. When a force acts and bends it forcibly at the inscribed plate, it will be broken clearly, and its internal shape will shrink, making it difficult for the lining material to pass through it.

The present invention has been made in view of such circumstances, and can easily pass through the main pipe with a compact device without forming a large holding portion, and can smoothly move the lining material into the branch pipe. It is an object of the present invention to provide an apparatus and a method capable of inverting and lining a device.

[0008]

Means for Solving the Problems The invention of an apparatus for lining a branch pipe according to the present invention is an apparatus for lining a branch pipe from a main pipe into a branch pipe branched from the main pipe by reverse insertion of a lining material. There is a main body passing through the main pipe, an inscribed plate provided in the main body, a pressure-resistant tube containing a lining material therein and having one end fixed to the inscribed plate,
A rotation drive unit for rotating the inner plate with a rotation axis parallel to the central axis of the main tube; and a pressure contact unit for moving the inner plate in a radial direction of the main tube, wherein the inner plate is It has a curved surface conforming to the inner surface shape of the main pipe and has a guide hole having a diameter substantially equal to the inner diameter of the branch pipe, and the pressure-resistant tube applies an internal pressure corresponding to the pressure at the time of reversing the lining material. And at least one end thereof is annularly coupled to the peripheral edge of the guide hole of the inner contact plate, and a pressure fluid inlet pipe is attached to the other end. is there.

In the apparatus of the present invention, when the internal pressure corresponding to the pressure at the time of reversal of the lining material is applied, the pressure-resistant tube is 3% to 50% in the length direction and 1% in the radial direction.
Preferably, it can be extended by 0 to 20%.

Further, in the method of lining a branch pipe according to the present invention, when the lining is applied to a branch pipe branched from the main pipe by reversing insertion of the lining material from inside the main pipe, the lining material is inverted. When an internal pressure corresponding to the pressure at the time of acting is applied, it is housed in a pressure-resistant tube that can be extended at least in the length direction, and the end of the pressure-resistant tube has a curved surface that matches the inner surface shape of the main pipe, and An inner plate having a guide hole having a diameter substantially equal to the inner diameter of the branch pipe is fixed to the periphery of the guide hole in an annular shape, and the terminal of the lining material is annularly supported at the periphery of the guide hole, and The plate is pressed against the inner surface of the main pipe so that the guide hole coincides with the opening of the branch pipe, and a pressurized fluid is applied to the pressure-resistant tube to reversely insert the lining material into the branch pipe. With That.

In the method of the present invention, the end portion of the lining material is folded outward, a flange is formed at the end of the folded portion, and the flange is clamped between the inner plate and the inner surface of the main pipe to form an annular shape. It is preferable to support.

Further, in the method of the present invention, the lining material is covered with an airtight flexible airtight tube, the airtight tube and the lining material are inserted into a pressure-resistant tube, and the end of the airtight tube is connected to the inner connecting plate. It is fixed to the periphery of the guide hole in an annular shape, the airtight tube is inverted with the fluid pressure and inserted into the branch line with the lining material, and then the airtight tube is inverted in the opposite direction and pulled out from the branch line. preferable.

Further, in this case, a short reinforcing tube is fitted between the airtight tube and the lining material at the end of the airtight tube, and the end of the reinforcing tube is connected to the inner connecting plate together with the airtight tube. It is preferable to fix the ring in an annular shape.

Further, in the method according to the present invention, the foldable ear portion of the lining material in a state where the lining material is folded is positioned at a position perpendicular to the axial direction of the main pipe in the guide hole of the inner connecting plate. Preferably, it is supported.

[0015]

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

FIG. 1 shows an embodiment of a lining device 1 of the present invention. Reference numeral 2 denotes a main body of the lining device 1. A sled 3 for sliding along the inner surface of the main pipe of the pipeline is provided on both sides. Is provided.

Reference numeral 5 denotes a rotating body provided at a rear portion of the main body 2, which is driven by an air motor 6 as a rotating drive means to rotate with respect to the main body 2. The rotating body 5 is provided with an elevating member 7, which can be moved up and down in the figure with respect to the rotating body 5 by an air cylinder 8 as a pressing means.

At the rear of the elevating member 7, an inner plate 9 is attached. As shown in FIG. 1B, the inscribed plate 9 has a curved surface that is curved upward so as to conform to the inner surface shape of the main pipe. It has a guide hole 10 of almost the same diameter.

A short cylinder 11 protrudes from the periphery of the guide hole 10 of the inner contact plate 9 on the upper surface, and a mounting cylinder 12
The mounting cylinder 12 is formed to be slightly inclined rearward. And the mounting cylinder 1
The end of the flexible pressure-resistant tube 13 is fixed to 2.

The pressure-resistant tube 13 is made of a tubular woven fabric which is woven into a tubular shape using at least a slightly elastic fiber such as polybutylene terephthalate fiber or spandex fiber as a warp. It is preferable to use a rubber or soft synthetic resin whose inner surface is subjected to an airtight treatment. And the pressure-resistant tube 13
Has elasticity at least in the radial direction.

The degree of elasticity of the pressure-resistant tube 13 is determined in such a manner that, when an internal pressure corresponding to a fluid pressure when the below-mentioned lining material 18 is re-transferred into the branch conduit is applied to the pressure-resistant tube 13, It must be able to extend about 3-50%. Further, it is preferable that the material can extend 10 to 20% in the radial direction.

If the elasticity in the longitudinal direction is insufficient, the pressure-resistant tube 13 cannot be smoothly curved at the inner plate 9 and bends at a sharp angle to reduce the internal space. 18 cannot pass smoothly, and a high fluid pressure is required for the reversal insertion of the lining material 18 into the branch line.

If the elasticity in the radial direction is insufficient,
When the lining member 18 is inserted into the branch conduit in an inverted manner, the pressure-resistant tube 13 does not expand sufficiently, and the frictional resistance between the lining member 18 and the pressure-resistant tube 13 increases.

If the elasticity in the length direction or the radial direction is excessively large, the strength in a state where the internal pressure is applied is reduced, and there is a possibility that the lining material 18 is ruptured by the fluid pressure at the time of reverse insertion. When the strength is increased by increasing the amount of yarn of the tubular woven fabric, the flexibility of the pressure-resistant tube 13 is impaired, and it is difficult to draw the tube into the main tube.

Next, a method of lining the branch pipe 14 of the sewer pipe using the lining device 1 will be described. In FIG. 2, reference numeral 15 denotes a main pipe of a sewer pipe, and a branch pipe 14 branches at a branch section 16, and a sewage 17 is formed at a tip of the branch pipe 14.

On the other hand, as shown in FIG. 3, the pressure-resistant tube 13 and the lining material 18 are mounted on the inner connecting plate 9 of the lining device 1.

As the lining material 18, a tubular woven fabric having a diameter substantially equal to the inner diameter of the branch conduit 14 can be used, and a rubber or synthetic resin airtight layer is formed on the outer surface of the tubular woven fabric. It is preferred to use one.

Further, by using a stretchable fiber such as polybutylene terephthalate fiber or spandex fiber as the warp in the tubular woven fabric, wrinkles or the like on the lining material 18 can be obtained even if the branch pipe 14 is bent. It can be inserted smoothly without any occurrence.

First, as shown in FIG. 4, one end of the lining material 18 is folded outward, and a plurality of cuts are made at the ends of the folded portion 19 to form strips 20. And S from both sides of the strip 20
Donut sheet 21 made of a curable material such as MC
5 to form a flange 22 having a curved shape at the end of the folded portion 19 so as to conform to the inner surface shape of the main pipe 15, as shown in FIG.

When the flange 22 is formed on the lining member 18, it is preferable that a ring-shaped water-swelling rubber 23 is integrally embedded in the upper surface of the flange 22. In addition, it is preferable that the flange 22 is formed such that the folding ear 18 ′ in a state where the lining material 18 is folded flat is at a position orthogonal to the central axis direction in the curvature of the flange 22.

Next, when the lining material 18 does not have airtightness, a flexible airtight tube 24 having airtightness is put on the outside of the lining material 18, and the airtight tube 24 is attached to the folded portion 19 of the lining material 18. Fold it along the inside. At the other end of the lining material 18, the airtight tube 2
4 is fixed integrally.

Then, a curable resin liquid is injected from the folded end into the lining material 18 and impregnated into the tubular fabric over the entire length of the lining material 18. By injecting the inside of the lining material 18 while reducing the pressure, the curable resin liquid can be efficiently impregnated over the entire lining material 18.

The curable resin liquid preferably contains about 1 part by weight of a thickener such as magnesium oxide per 100 parts by weight of the resin liquid. By mixing the thickener, the curable resin liquid impregnated in the tubular fabric is thickened, the handleability of the lining material 18 is improved, and the fluidity of the resin solution is lost. Impregnation amount hardly fluctuates partially, and the physical properties after curing become more stable even when touching the intruding water in the pipeline.

Next, a short reinforcing tube 25 is disposed between the liner 18 and the airtight tube 24 at the folded portion 19 of the liner 18. This reinforcing tube 25
The same material as the tubular woven fabric of the lining material 18 can be used, but it is preferable that the diametrical expansion when an internal pressure is applied is small.

Next, the lining material 18 and the airtight tube 24 are inserted into the guide holes 10 of the inner plate 9, and the folded portion 19 of the lining material 18 is placed on the upper surface of the inner plate 9 with its curved shape matched. The pressure-resistant tube 1 is provided outside the lining material 18 and the airtight tube 24 extending downward from the inscribed plate 9.
3 and the terminal of the pressure-resistant tube 13 is air-tightly fixed to the outer periphery of the mounting tube 12 together with the reinforcing tube 25 that is folded outward. The outside end of the airtight tube 24 is airtightly fixed to the closing lid 26 together with the other end of the pressure-resistant tube 13.

The length of the pressure-resistant tube 13 is
If it is shorter than 8, an appropriate extension tube can be connected to the other end of the pressure-resistant tube 13. The extension tube may be made of the same material as the pressure-resistant tube 13, but is not necessarily required to have the elasticity in the length direction and the radial direction like the pressure-resistant tube 13.

When the pressure-resistant tube 13 is air-tight, it is not necessary to insert the outer portion of the air-tight tube 24 into the pressure-resistant tube 13. It can be fixed to the mounting cylinder 12 together with the tip.

If the lining material 18 is also pressure-resistant, the airtight tube 24 and the reinforcing tube 2
Although it is possible to use no airtight tube 5, it is preferable to use an airtight tube 24 in order to prevent leakage of the pressurized fluid from between the flange 22 and the inner plate 9. Further, the airtight tube 24 protrudes from the gap and excessively. Preferably, a stiffening tube 25 is used to prevent expansion.

A control cable 27 is attached to the other end of the lining material 18 and extends rearward through the closing lid 26. A pressure fluid for inserting a pressure fluid into the pressure-resistant tube 13 is inserted into the closing lid 26. Attach the inlet pipe 28.

In this state, as shown in FIG. 2, the lining device 1 is towed by the towing line 29 and drawn into the main pipe 15. The lining device 1 is towed by the towing line 29, slides along the inner surface of the main pipe 15 with the sled 3, and proceeds while dragging the pressure-resistant tube 13 attached to the inner plate 9 to the rear.

When the inner plate 9 reaches the branch portion 16 of the branch pipe 14, the advance of the lining device 1 is stopped. Then, while observing with a small television camera 30 suspended in the branch pipe 14, fine adjustment of the front and rear positions of the inner connecting plate 9 is performed by the towing cable 29 and the control cable 27, and the rotating body 5 is rotated by the air motor 6. To adjust the position in the circumferential direction, and to
The lining device 1 is supported on the main pipe 15 by the outrigger 4 at that position. Then, the air cylinder 8 is operated to push up the elevating member 7,
The inner plate 9 is pressed against the inner surface of the main pipe 15 around the branch portion 16, and the flange 22 of the lining material 18 is sandwiched between the inner plate 9 and the inner surface of the main pipe 15. This state is shown in FIG.

In this state, a pressure fluid such as compressed air is inserted from the pressure fluid supply pipe 28 into the pressure-resistant tube 13 (or the outside portion of the air-tight tube 24 when the air-tight tube 24 is provided) to apply the fluid pressure. Then, as shown in FIG. 7, while the lining material 18 is turned over so that the inside is turned to the outside, the inverted portion enters the branch pipe 14 and the inverted lining material 18 is moved by the fluid pressure into the branch pipe 14. It is pressed against the inner surface.

At this time, in the present invention, since the pressure-resistant tube 13 can expand and contract at least in the length direction, the pressure-resistant tube 13 is attached from the state along the axial direction of the main pipe 15 as shown in FIG. It can smoothly bend to the upward state attached to the cylinder 12.
In addition, by making the pressure-resistant tube 13 expandable and contractible in the radial direction, the diameter expands, and the unreversed lining material 18 travels through it without resistance, and is supplied to the reversing portion.

Further, the inner portion of the airtight tube 24 is inverted with the inversion of the lining material 18 while being in close contact with the lining material 18, and the pressure fluid leaks from the gap between the lining material 18 or the flange 22 and the inner plate 9. The reinforcing tube 25 covers the inside of the flange 22 to prevent the airtight tube 24 from protruding from the gap or excessively expanding and bursting.

The speed at which the reversing of the lining material 18 proceeds is adjusted by applying tension to the control rope 27 from behind.
The lining material 18 is prevented from reversing at an excessively high speed, and the lining material 18 is gradually reversed so that the reversing lining material 18 is surely connected to the branch line 1.
4 Press against the inner surface.

When the lining material 18 is inverted over its entire length, the lining material 18 is pressed against the inner surface of the branch pipe 14 over its entire length as shown in FIG. Project into the sewage trough 17.

In this state, the lining material 18 protruding into the sewage tank 17 is closed with a suitable pinch fitting or the like, and while maintaining the fluid pressure in the lining material 18, the tip of the lining material 18 is cut off to remove the terminal fitting 31. And closing the blockage while inserting a heating and pressurizing fluid such as pressurized steam from the heating and pressurizing fluid supply pipe 32.

While discharging the pressurized fluid in the lining material 18 from the pressurized fluid supply pipe 28, the fluid is replaced by inserting the heated and pressurized fluid from the heated and pressurized fluid supply pipe 32, and replaced with the heated and pressurized fluid. The branch line 14 is maintained by maintaining the fluid pressure in the lining material 18.
While being pressed against the inner surface, the curable resin liquid impregnated in the lining material 18 is cured by heating, and the lining material 18 is separated from the branch conduit 14.
Glue to the inner surface.

When the curable resin liquid has sufficiently hardened, the lining material 18 protruding into the sewage tank 17 is cut off at the end of the branch line 14, and if an airtight tube 24 is used, it is shown in FIG. As described above, the end of the airtight tube 24 is connected to the end of the control cable 27 and pulled back while being inverted in the opposite direction, peeled off from the inner surface of the lining material 18 and
Collect within.

Thereafter, the air cylinder 8 is operated to lower the elevating member 7, the support of the lining device 1 on the inner surface of the main pipe 15 by the outrigger 4 is released, and the towing cable 29 or the control cable 27 is towed. Then, the lining device 1 is taken out of the main pipe 15.

[0051]

In the present invention, since the pressure-resistant tube 13 can be expanded and contracted in its length direction, it can be bent relatively freely even when it is expanded by the application of internal pressure. Even if it is bent at a steep angle at the mounting position, it will not be broken clearly and will not hinder the progress of the lining material 18 therein.

Further, since the pressure-resistant tube 13 can expand and contract in the radial direction, when the inside of the pressure-resistant tube 13 is pressurized in order to insert the lining material 18 upside down, it expands in the radial direction and expands in the internal space. Is increased, the frictional resistance when the lining material 18 passes through is small, and the reverse insertion can be performed smoothly.

[0053]

Thus, according to the present invention, the pressure-resistant tube 1
3 can be bent at a steep angle at the position where it is attached to the inner plate 9, so that the mounting cylinder 12 does not need to be bent greatly backward as in the prior art.

Therefore, the mounting cylinder 1 downward from the inner contact plate 9
2 can be small, the lining device 1 can be made more compact, it can pass through the main pipe 15 smoothly, and even if there is a diameter variation or a step inside the main pipe 15. There is no obstruction to the passage of the lining device 1.

According to the invention of claim 5, the lining material 1
8 is turned outward, a flange 22 is formed at the turned end, and the flange 22 is pressed between the inner contact plate 9 and the inner surface of the main pipe 15 to be annularly supported. It can be supported in a state where it is partially inserted into the branch pipe 14, the support state is stabilized, and no excessive distortion occurs at the boundary between the lining material 18 and the flange 22. Can be lined.

Further, according to the invention of claim 6, the lining material 1
8 with the airtight tube 24 placed over the outside of the branch line 1
4, the reverse insertion is possible even when the lining material 18 does not have airtightness, and even if there is a gap between the inner contact plate 9 and the flange 22, the pressure fluid is supplied therefrom. The lining material 18 can be surely invertedly inserted into the branch pipe line 14 without leaking.

According to the seventh aspect of the present invention, a short reinforcing tube 25 is fitted between the hermetic tube 24 and the lining member 18 at the end of the hermetic tube 24. The portion is reinforced on the inside, so that it is possible to prevent the airtight tube 24 from protruding from the gap between the flange 22 and the inner connecting plate 9 or to be excessively expanded and burst.

According to the eighth aspect of the present invention, since the folding ear portion 18 'of the lining member 18 is supported at a position orthogonal to the direction of the central axis of the curve in the guide hole 10 of the inner contact plate 9, it is supported. The lining material 18 is arranged in a flat folded state in the pressure-resistant tube 13, and can be turned into the branch pipe 14 while being naturally bent in the width direction by the pressure-resistant tube 13, and can be inverted. The progress of the lining material 18 accompanying insertion becomes smoother.

As shown in FIG. 3, by embedding an annular water-swelling rubber 23 in the upper surface of the flange 22,
When the water in the main pipe 15 enters between the flange 22 and the main pipe 15, the water swells the water swelling rubber 23 and fills the space between the main pipe 15 and the flange 22. It can be prevented from entering between the conduit 14 and the lining material 18.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of a lining device of the present invention.

FIG. 2 is a central longitudinal sectional view showing a state in which a lining device is inserted into a main pipe in the method of the present invention.

FIG. 3 is a central longitudinal sectional view showing a state in which a pressure-resistant tube and a lining material are attached to an inner plate of the lining device.

FIG. 4 is an exploded perspective view showing a state where a flange is formed on the lining material.

FIG. 5 is a side view of a lining material formed with a flange.

FIG. 6 is a central longitudinal sectional view showing a state where a terminal of a lining material is pressed against a branch portion in the method of the present invention.

FIG. 7 is a central longitudinal sectional view showing a state in which a lining material is invertedly inserted into a branch conduit in the method of the present invention.

FIG. 8 is a central longitudinal sectional view showing a state in which the reverse insertion of the lining material into the branch pipe is completed in the method of the present invention.

FIG. 9 is a central longitudinal sectional view showing a state in which a heating and pressurizing fluid is fed into a lining material inserted into a branch conduit.

FIG. 10 is a central longitudinal sectional view showing a state in which an airtight tube is pulled out from a lining material lined in a branch conduit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lining device 2 main body 6 air motor (rotating driving means) 8 air cylinder (pressing means) 9 inner connecting plate 10 guide hole 13 pressure-resistant tube 14 branch pipe 15 main pipe 18 lining material 18 ′ folding ear 19 folding part 22 Flange 24 Airtight tube 25 Reinforcement tube

Claims (8)

[Claims] From the inside of the main pipe (15), the main pipe (15)
A liner (18) that is reversely inserted into a branch pipe (14) branching from the main pipe (14).
5) A main body (2) passing through the inside, an inner connecting plate (9) provided in the main body (2), and a lining material (18) housed therein and one end thereof is connected to the inner connecting plate (9). And a rotation driving means (6) for rotating the inner plate (9) about a rotation axis parallel to the central axis of the main pipe (15).
And pressing means (8) for moving the inner plate (9) in the radial direction of the main pipe (15).
Has a guide hole (10) having a curved surface conforming to the inner surface shape of the main pipe (15) and having a diameter substantially equal to the inner diameter of the branch pipe (14), and the pressure-resistant tube (13) is provided with the lining. When an internal pressure corresponding to the pressure at the time of reversal of the material (18) is applied, it can be extended at least in the longitudinal direction, and one end thereof is annularly formed on the peripheral edge of the guide hole (10) of the internal contact plate (9). Characterized in that a pressure fluid inlet pipe (28) is attached at the other end to the branch line. 2. The pressure-resistant tube (13) is capable of extending in a length direction by 3 to 50% when an internal pressure corresponding to a pressure at the time of reversal of the lining material (18) is applied. The lining device for a branch pipeline according to claim 1, 3. The pressure-resistant tube (13) is capable of extending in a radial direction by 10 to 20% when an internal pressure corresponding to a pressure at the time of reversal of the lining material (18) is applied. The lining device of a branch pipeline according to claim 1 or 2, 4. The main pipe (15) from within the main pipe (15).
When the liner (18) is reversely inserted into the branch conduit (14) branching from the lining, the liner (1)
8) is housed in a pressure-resistant tube (13) that can be extended at least in the length direction when an internal pressure corresponding to the pressure at the time of reversal of the lining material (18) is applied. The terminal of the inscribed plate (9) having a curved surface conforming to the inner surface shape of the main pipe (15) and having a guide hole (10) having a diameter substantially equal to the inner diameter of the branch conduit (14). The end of the lining material (18) is annularly supported at the periphery of the guide hole (10) while being fixed to the periphery of the guide hole (10) in an annular shape, and the inscribed plate (9) is fixed to the guide hole (10) by the guide hole (10). The inner surface of the main pipe (15) is pressed against the inner surface of the main pipe (15) so as to match the opening of the branch pipe (14), and
3) applying a pressurized fluid inside to insert the liner (18) upside down into the branch line (14).
How to line branch pipes 5. An end portion of the lining material (18) is turned outward, a flange (22) is formed at an end of the turned portion (19), and the flange (22) is connected to the inner plate (9). The method according to claim 4, characterized in that it is clamped between the inner surface of the pipe (15) and supported in an annular manner. 6. An airtight flexible airtight tube (24) is put on the lining material (18), and the airtight tube (24) and the lining material (18) are pressure-resistant tube (13).
At the same time, the end of the airtight tube (24) is fixed to the periphery of the guide hole (10) of the inner plate (9) in an annular shape, and the airtight tube (24) is fluid-pressured together with the lining material (18). 5. The method according to claim 4, characterized in that it is reversed and inserted into the branch line (14), after which the airtight tube (24) is reversed in the opposite direction and withdrawn from the branch line (14). How to line branch pipes 7. An airtight tube (24) and the lining material (1) at an end of the airtight tube (24).
8) is fitted with a short reinforcing tube (25), and the end of the reinforcing tube (25) is connected to the airtight tube (2).
7. The method according to claim 6, wherein the branch line is fixed to the inner plate (9) in an annular shape together with (4). 8. The folding ear part (1) in a state where the lining material (18) is folded.
8. The method for lining a branch pipe according to claim 4, wherein the inner pipe is supported at a position orthogonal to the direction of the central axis of the curve in the guide hole of the inscribed plate.