JP2001108145A - In-pipe lining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To line inside of a pipe while a passage area is secured by a resin lining layer formed by a cloth-made tubular body impregnated with resin and an air-tight tube for lining made adhere to the resin lining layer. SOLUTION: According to this in-pipe lining construction method, a cloth- made tubular body 3 where an existing pipe A is passed and a lining air-tight tube 2 passed through the cloth-made tubular body are increased in diameter by a pressure fluid 5 supplied to the inside thereof, and lining is applied to the inside of an existing pipe by a resin lining layer obtained by hardening unhardened resin 4 impregnating the cloth-made tubular body and a lining air-tight tube made adhere to the resin lining layer. In this method, after the cloth-made tubular body is preliminarily increased in diameter by a diameter enlarging air-tight tube 10 passed by a reversal construction method, the lining air-tight tube passed through the cloth-made tubular body by the reversal construction method and the cloth-made tubular body are integrated after the preliminary diameter enlarging process of drawing the diameter enlarging air- tight tube from the inside of the cloth-made tubular body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a flexible cloth cylinder inserted through an existing pipe and a flexible lining airtight tube inserted through the cloth cylinder.
A resin lining layer formed by expanding the diameter with the pressurized fluid supplied inside the airtight tube for lining and curing the uncured resin impregnated in the cloth cylinder, and adhered to the resin lining layer. The present invention relates to an in-pipe lining method for lining the inside of the existing pipe with the air-tight tube for lining performed.

[0002]

2. Description of the Related Art In the above-mentioned in-pipe lining method, conventionally, a cloth tubular body is drawn into an existing pipe and inserted into the existing pipe, and then the inner and outer surfaces of the tube are turned upside down in order from the leading end in the insertion direction into the pipe. The lining airtight tube is inserted into the cloth cylinder by the reversal method of expanding the diameter of the tube portion with the pressurized fluid supplied to the inside, and the pressurized fluid supplied to the inside of the inverted tube portion is used for lining. Expand the airtight tube with the cloth cylinder,
The inside of the existing pipe is lined.

[0003]

For this reason, there is a disadvantage that it is difficult to secure a flow path area once a portion where the diameter of the lining airtight tube cannot be sufficiently expanded is formed in the existing pipe. In other words, when the lining airtight tube is inserted by the inversion method into the cloth cylinder inserted through the existing pipe, the lining airtight tube is sufficiently expanded in diameter together with the cloth cylinder, and the cloth cylinder is the cloth cylinder. In the middle of the part that is tightly adhered to the inside of the existing pipe with uncured resin impregnated in
If the diameter of the lining airtight tube is not sufficiently expanded and there is a poorly expanded portion where a space remains between the cloth tube and the existing tube, the air in the space of the poorly expanded portion will be It is difficult to get out of the tube through the space between the front and rear cloth cylinders and the existing tube.In this state, supply a high-pressure pressurized fluid inside the lining airtight tube, and use Even if the tube is further expanded in diameter together with the cloth tube, it is difficult to expand the diameter sufficiently, and once a diameter expansion failure portion is formed, it is difficult to secure a flow path area. In addition, as shown in FIG. 11, in the case where a bent pipe portion C is provided in the middle of the existing pipe A, the lining airtight tube 2 is hard to expand in the bent pipe portion C together with the cloth cylinder 3, and the bent pipe portion There is a disadvantage that it is difficult to secure the flow area of the portion C. That is, as shown in FIG. 11A, the cloth tubular body 3 easily expands in the longitudinal direction and contracts in the radial direction due to the pulling force at the time of being drawn into the existing pipe A, and furthermore, in the bent pipe section C, Since the cloth tube 3 is drawn in a state of being pressed against the small-diameter tube wall E, the cloth tube 3 is inserted in the bent tube portion C in a state where the diameter of the cloth tube 3 is particularly difficult to expand. The resistance for expanding the diameter together with 3 is large. For this reason, as shown in FIG.
When the lining hermetic tube 2 is inserted into the cloth cylinder 3 inserted through the tube section C by a reversing method, the lining hermetic tube 2 passes through the curved pipe portion C without sufficiently expanding the diameter of the cloth cylinder 3. Into the straight pipe section B, and in the straight pipe section B before and after the bent pipe section C is sandwiched, the cloth cylinder 3
Is sufficiently enlarged, and the uncured resin 4 impregnated in the cloth cylinder 3 is easily brought into close contact with the inside of the existing pipe A. However, in the bent pipe section C, the gap between the cloth cylinder 3 and the existing pipe A is increased. The air in the space S hardly escapes outside the pipe through the straight pipe portion B, and in this state, a high-pressure pressurized fluid is supplied to the inside of the lining airtight tube 2, Even if it is attempted to further increase the diameter of the lining airtight tube 2 of the curved pipe portion C together with the cloth cylinder 3, it is difficult to increase the diameter sufficiently.
It is difficult to secure the flow passage area of the bent pipe portion C. The present invention has been made in view of the above circumstances, and a resin lining layer formed of a cloth cylinder impregnated with a resin, and a lining airtight tube adhered to the resin lining layer, the flow path area The purpose is to enable lining while securing the space.

[0004]

According to a first aspect of the present invention, there is provided a flexible tubular body inserted through an existing pipe, and a flexible tubular body inserted through the tubular body. And a resin lining layer formed by curing the uncured resin impregnated in the cloth cylinder by expanding the diameter of the lining airtight tube with the pressurized fluid supplied inside the lining airtight tube. And, the in-pipe lining method for lining the inside of the existing pipe with the air-tight tube for lining adhered to the resin lining layer, while sequentially inverting the inner and outer surfaces of the tube from the tip side in the insertion direction into the pipe, By the reversal method of expanding the tube part with the pressurized fluid supplied inside,
After inserting a flexible diameter-enlarging tube with flexibility into the cloth cylinder and preliminarily expanding the cloth cylinder, preliminarily expanding the diameter-enlarging tube from the inside of the cloth cylinder. A step is provided, and after the pre-diameter expanding step, the lining airtight tube is inserted into the pre-expanded cloth cylinder by the inversion method, and the cloth cylinder and the lining airtight tube are integrated. In the point that [Operation] The airtight tube for diameter expansion was inserted into the cloth cylinder inserted through the existing pipe by the inversion method, and the airtight tube for diameter expansion was expanded together with the cloth cylinder, thereby preliminarily expanding the cloth cylinder. After that, the preparatory expansion step of pulling out the airtight tube for expanding from the inside of the cloth cylinder causes the cloth cylinder to have a small resistance to expand the airtight tube for lining in the post-process and is easily expanded in the radial direction. After this preliminary diameter expansion step, when the lining airtight tube is inserted into the cloth cylinder by the inversion method,
It is easy to insert the lining airtight tube with the cloth cylinder while expanding it sufficiently, and even if there is a poor diameter expansion part where space remains between the cloth cylinder and the existing pipe at the time of preliminary expansion, Since the lining airtight tube is not inserted into the inside of the cloth cylinder, it is easy to remove the air in that space by pushing it out of the pipe by the lining airtight tube inserted into the cloth cylinder by the inversion method. In addition, it is difficult to form a poor diameter expansion portion in which a space remains between the cloth tube and the existing pipe. [Effect] Accordingly, the resin lining layer formed of the cloth cylinder impregnated with the resin and the lining airtight tube adhered to the resin lining layer allow lining while securing a flow path area.

[0005] A feature of the invention according to claim 2 is that a bent pipe portion is provided in the middle of the existing pipe. [Operation] The airtight tube for diameter expansion is inserted by a reversing method into the cloth cylinder inserted into the existing pipe, and the diameter of the airtight tube for diameter expansion is expanded together with the cloth cylinder. After the pre-expansion, the pre-expansion step of pulling out the air-tight tube for expansion from the inside of the cloth cylinder causes the cloth cylinder of the bent tube section to have a resistance for expanding the air-tight tube for lining in the post-process. Is small and easy to expand in the radial direction, so that it can be loosely inserted into the bent pipe section.After this preliminary expanding step, when the lining airtight tube is inserted into the cloth cylinder by the reversal method, the lining airtight The tube is easy to enter the straight pipe section after the cloth cylinder of the bent pipe section is sufficiently expanded, and there is a poor diameter expansion part where space remains between the cloth cylinder and the bent pipe section at the time of preliminary diameter expansion. Even if you can do it, Since the lining airtight tube is not inserted into the inside of the cloth cylinder, it is easy to remove the air in that space by pushing it out of the pipe by the lining airtight tube inserted into the cloth cylinder by the inversion method. In addition, it is difficult to form a poor diameter expansion portion in which a space remains between the cloth cylinder and the bent tube portion. [Effect] Therefore, even when lining an existing pipe provided with a curved pipe portion in the middle, lining can be performed while securing the flow path area of the curved pipe portion.

A third feature of the present invention is that the one end side of the pull-in cord inserted into the airtight tube for expansion or the airtight tube for lining before inversion is connected to the airtight tube for expansion or the lining. And the other end of the pull-in cord is inserted into the cloth cylinder, and the diameter-enlarging airtight tube or the lining airtight tube is subjected to the inversion method. While pulling in the pull-in direction by the pull-in cord while inserting into the cloth cylinder. [Action] While inserting the airtight tube for diameter expansion or the airtight tube for lining through the cloth cylinder by the inversion method,
The other end of the pull-in cord inserted through the cloth tube is pulled in the pull-in direction. [Effect] The airtight tube for expanding or the airtight tube for lining can be easily inserted into the cloth cylinder by the inversion method. Further, even in an existing pipe having a bent pipe portion that is difficult to insert the airtight tube for diameter expansion or the airtight tube for lining into a cloth cylinder, the airtight tube for diameter expansion or the airtight tube for lining is turned into a cloth cylinder by a reversal method. Easy to insert.

According to a fourth feature of the present invention, one end of a pull-out cord is connected to a rear end side of the diameter-enlargement airtight tube before insertion in the insertion direction, and the diameter-expansion airtight tube is turned by the inversion method. After the airtight tube is inserted through the cloth cylinder and the cloth cylinder is preliminarily expanded in a state in which the pull-out cord is pulled inside the airtight tube for diameter expansion, the airtight tube for diameter expansion is used. Is pulled in the pulling-out direction such that the inner and outer surfaces of the pulling-out rope body are sequentially reversed from the leading end side in the insertion direction, and the airtight tube for expanding the diameter is pulled out from the inside of the cloth cylinder. [Effect] After expanding the diameter-enlarging tube together with the cloth cylinder and preliminarily expanding the cloth cylinder, when pulling out the diameter-enlarging tube from the inside of the cloth cylinder, the diameter-enlarging tube is enlarged. With the pull-out cord pulled into the inside of the tube, the diameter-enlargement airtight tube is pulled in the pull-out direction so that the inner and outer surfaces are sequentially inverted from the insertion direction front end side, and the diameter-expansion airtight tube is placed inside the cloth cylinder. Can be withdrawn from. [Effect] Since the inner and outer surfaces of the diameter-enlargement airtight tube are sequentially reversed from the front end side in the insertion direction, and the diameter-enlargement airtight tube can be separated from the inside of the cloth cylinder, the diameter-enlargement airtight tube is replaced with the cloth cylinder. Can be easily pulled out from inside the body.

A feature of the invention according to claim 5 is that the airtight tube for expanding is also used as the airtight tube for lining. [Function] After expanding the lining airtight tube with the cloth cylinder and preliminarily expanding the cloth cylinder, after the preliminary diametric expansion step of drawing out the lining airtight tube from the inside of the cloth cylinder, the lining airtight tube is subjected to a pre-expansion step. The airtight tube is inserted again into the pre-expanded cloth cylinder by the inversion method. [Effect] The lining can be easily performed so that the flow path area can be ensured without separately preparing and using the airtight tube for diameter expansion and the airtight tube for lining.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, portions denoted by the same reference numerals as those of the conventional example indicate the same or corresponding portions. FIG. 1 shows an in-pipe lining structure for preventing corrosion leaks, joint leaks, and breakage leaks that occur later in a gas pipe A as an example of an existing pipe. A cloth cylinder 3 having impact resistance and a lining airtight tube 2 made of polyurethane elastomer and having flexibility inserted through the cloth cylinder 3 were supplied to the inside of the lining airtight tube 2. A resin lining for reinforcement formed by curing an uncured epoxy resin (an example of a thermosetting resin) 4 impregnated in the cloth cylinder 3 by expanding the diameter with pressurized air 5 as a pressurized fluid. Layer 1
The inside of the gas pipe A is lined with a lining airtight tube 2 for forming an airtight layer adhered to the resin lining layer 1.

At both ends of the lining hermetic tube 2, enlarged-diameter biasing rings 6 are attached, and the resin lining layer 1 and the lining hermetic tube 2 are pressed against the inside of the gas pipe A, and the resin lining layer 1 is The peeling from the end of the lining airtight tube 2 is prevented. The cloth cylinder 3
A weft thread made of polyethylene fiber (a kind of high-strength fiber) along the cylinder circumferential direction, so that the circumferential length is substantially the same as the inner circumferential length of the straight pipe portion B of the gas pipe A; It is plain woven in a cylindrical shape with a warp made of polyethylene fiber (a kind of high-strength fiber) along the longitudinal direction.

A lining method for lining the inside of the gas pipe A with the resin lining layer 1 and the lining airtight tube 2 will be described with reference to FIGS.
As shown in FIG. 2 (a), pits D1 and D2 are excavated at both ends of the lining section, the gas pipe A exposed in each pit D1 and D2 is cut, and towing is performed using a wire tool or the like. Wire W1 is inserted through the gas pipe A in the lining section,
One end of the towing wire W1 is connected to the feed-out end of the cloth cylinder 3 wound around the drum 7 in a state of being folded in the radial direction.

Then, as shown in FIG. 2B, the other end of the towing wire W1 is towed by the winch 8, and the cloth tube 3 is inserted into the gas pipe A. In the middle of the gas pipe A in the lining section, two curved pipe portions C are provided at the street elbow 9. When the lining airtight tube 2 and the diameter-enlarging airtight tube 10 described below are drawn into the cloth tube 3, a wire for drawing in is inserted into the cloth tube 3.
(Example of pulling cord) Wire W used as W2
2a is inserted in advance and connected to the tow wire W1. The cloth cylinder 3 inserted into the gas pipe A is deformed to have a reduced diameter with many wrinkles along the cylinder longitudinal direction.

Next, as shown in FIG.
And cut the cloth cylinder 3 on the side of the pit D2 into the gas pipe A.
The uncured epoxy resin 4 is injected into the cloth cylinder 3 from the pit D1 side, and the air hose 12 of the compressor 11 is connected to the open end of the gas pipe A on the pit D1 side. Then, the epoxy resin 4 is moved to the other end of the cloth cylinder 3 by the pressurized air 5 supplied from the compressor 11, and the uncured epoxy resin 4 is impregnated into the entire cloth cylinder 3. The uncured epoxy resin 4
Has a viscosity of about 800 cP at room temperature, and contains a curing agent so that it hardens to the touch in about 3 to 4 hours.

Next, flexibility is provided by a reversing method in which the inner and outer surfaces of the tube are sequentially reversed from the distal end side in the insertion direction into the tube, and the reversed tube portion is enlarged by the pressurized fluid supplied to the inside thereof. A pre-diameter expansion step of inserting the expanded diameter airtight tube 10 into the cloth cylinder 3 to preliminarily expand the diameter of the cloth cylinder 3, and then pulling out the diameter expansion airtight tube 10 from the inside of the cloth cylinder 3. Move on to

That is, the diameter-enlarging airtight tube 10 has a hardness (J
(ISK7311A method) is about 80-90 and thickness is 0.5mm
As shown in FIG. 3 (d), the lining airtight tube 2 is made to fold and deform in the radial direction, and the drum 13 is wound up so that the lining airtight tube 2 can be rolled out freely. Is installed in the pit D1.
The lining airtight tube 2 has a winding start end side sealed in advance, and a length corresponding to the length of the lining section is wound around the drum 13, and a wire W2b used as a drawing wire W2 inside thereof. Is inserted in advance, and one end thereof is connected to the rear end side of the lining airtight tube 2 in the insertion direction, that is, the winding start end side.

After the lining airtight tube 2 is inserted into the cloth cylinder 3 as the diameter expansion airtight tube 10 to preliminarily expand the diameter of the cloth cylinder 3, the lining airtight tube 2 is removed from the cloth cylinder 3. One end of a pull-out wire (an example of a pull-out cord) W3 used for once pulling is connected to the rear end side of the lining airtight tube 2 in the insertion direction, that is, the winding start end side, and the other end side is connected. It is fixed to the drum 13 and wound around the drum 13. And
As shown in FIG. 4, the wires W2a and W2b used as the pull-in wire W2 are connected to each other, and the inner and outer surfaces of the end of the lining airtight tube 2 on the feeding side from the drum 13 are inverted to form the cloth cylinder 3 At the same time, it is fixed to the end of the gas pipe A with the fixing jig 15, and the connection portion 16 provided on the casing 14 is airtightly connected to the end of the gas pipe A as shown in FIG.

Next, as shown in FIG.
The pressurized air 5 at normal temperature as a pressurized fluid is supplied by the compressor 11, and the lining airtight tube 2, which is folded and deformed in the radial direction by the pressure of the pressurized air 5, is inserted into the inside of the cloth tube 3. The lining airtight tube 2 is turned over from the front end side in the insertion direction while
The pressurized air 5 supplied between the tube part before the inversion and the tube part after the inversion inserted into the airtight tube 2 for lining by a reversing method in which the tube part after the reversal is expanded and deformed together with the cloth cylinder 3. Is drawn through the cloth cylinder 3 while the diameter of the cloth cylinder 3 is preliminarily expanded, and the drawing wire W2 is pulled in the drawing direction, as shown in FIG.
The lining airtight tube 2 is inserted through the entire length of the section to be lined.

In the pre-expanded cloth cylinder 3, the diameter of the cloth cylinder passing through the curved pipe section C is insufficient, and the space S between the curved pipe section C and the cloth cylinder 3 is insufficient. Are formed and air is accumulated. By the reversing method, as the winding start end of the lining airtight tube 2 enters the inside of the cloth cylinder 3, the drawing wire W3 connected to the lining airtight tube 2 is drawn out from the drum 13, and It is drawn inside the airtight tube 2 for lining after inversion.

Next, as shown in FIGS. 8 and 9, while the inside of the lining airtight tube 2 inserted through the cloth cylinder 3 is kept in a pressurized state, the pull-out wire W3 is connected to the drum 1.
3, the lining airtight tube 2 is pulled in the pull-out direction such that the inner and outer surfaces are sequentially reversed from the insertion direction front end side, and the lining airtight tube 2 is inwardly extended over the entire length of the cloth tube 3 , And is wound up around the drum 13 to complete the pre-expanding step of pre-expanding the cloth tube 3.

Next, while the pulling wire W2 is pulled in the pulling direction by the above-described reversing method, the lining airtight tube 2 is again inserted into the pre-expanded cloth cylinder 3 as shown in FIG. , Along with its insertion,
A space S formed between the curved pipe portion C and the cloth tube 3
Is pushed out of the tube, and the cloth cylinder 3 is expanded together with the lining airtight tube 2 so as to be substantially in close contact with the inside of the bent tube portion C. Then, after the lining airtight tube 2 is inserted over the entire length of the cloth cylinder 3, the inside of the lining airtight tube 2 is maintained so that the lining airtight tube 2 and the cloth cylinder 3 can be maintained in an expanded state. After the epoxy resin 4 impregnated in the cloth cylinder 3 is cured while maintaining the pressurized state, the casing 14 and the fixing jig 15 are removed, and the ends of the cloth cylinder 3 and the lining airtight tube 2 are removed. The tube is cut along the end of the gas pipe A, and the cloth cylinder 3 and the lining airtight tube 2 are integrated with the cured epoxy resin 4 as shown in FIG.

[Other Embodiments] The in-pipe lining method according to the present invention may use a cloth cylinder formed by braiding high-strength fiber yarns into a braid, and the method of knitting the cloth cylinder is not particularly limited. 2. In the in-pipe lining method according to the present invention, an airtight tube for lining made of vinyl chloride-based elastomer, polyolefin-based elastomer, or rubber may be used in addition to various polyurethane-based elastomers. 3. In the in-pipe lining method according to the present invention, a dedicated air-tight tube for diameter expansion other than the air-tight tube for lining may be used instead of using the air-tight tube for diameter expansion as the air-tight tube for lining. 4. In the in-pipe lining method according to the present invention, a resin lining layer may be formed by curing an uncured thermosetting resin other than the epoxy resin impregnated in the cloth cylinder. 5. In the pipe lining method according to the present invention, when the lining airtight tube is inserted into the cloth cylinder after the pre-expansion by the inversion method, the lining airtight tube is pressed with a pressurized heating fluid such as steam as a pressurized fluid. The diameter may be enlarged to promote the curing of the uncured resin impregnated in the cloth cylinder. 6. The in-pipe lining method according to the present invention may be applied to lining the inside of an existing pipe having no bent pipe portion. 7. The in-pipe lining method according to the present invention may be applied to not only existing gas pipes but also existing water pipes and sewer pipes.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pipe lining structure.

FIG. 2 is an explanatory view of a pipe lining method.

FIG. 3 is an explanatory view of a pipe lining method.

FIG. 4 is an explanatory view of a pipe lining method.

FIG. 5 is an explanatory view of a pipe lining method.

FIG. 6 is an explanatory view of a pipe lining method.

FIG. 7 is an explanatory view of a pipe lining method.

FIG. 8 is an explanatory view of a pipe lining method.

FIG. 9 is an explanatory view of a pipe lining method.

FIG. 10 is an explanatory view of a pipe lining method.

FIG. 11 is an explanatory view of a conventional in-pipe lining method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin lining layer 2 Airtight tube for lining 3 Cloth cylinder 4 Resin 5 Pressurized fluid 10 Airtight tube for diameter expansion A Existing pipe C Curved pipe W2 Pull-in cord W3 Pull-out cord

Claims (5)

[Claims] 1. A pliable cloth cylinder inserted through an existing pipe and a pliable lining airtight tube penetrated through the cloth cylinder are placed inside the lining airtight tube. A resin lining layer formed by curing the uncured resin impregnated in the cloth cylinder by expanding the diameter with the pressurized fluid supplied to the airtight tube, and the air-tight tube for lining adhered to the resin lining layer And an inner pipe lining method for lining the inside of the existing pipe with the pressurized fluid supplied to the inside of the inverted tube portion while the inner and outer surfaces of the tube are sequentially inverted from the leading end side in the insertion direction into the pipe. After the diameter of the cloth tube has been preliminarily expanded by inserting a flexible air-tight tube with flexibility into the cloth cylinder by the reversing method of expanding the diameter, the diameter of the cloth tube is increased. Is provided from the inside of the cloth cylinder, and after the pre-diameter expansion step, the airtight tube for lining is inserted into the pre-expanded cloth cylinder body by the inversion method, and the cloth is formed. An in-pipe lining method for integrating a tubular body and the lining airtight tube. 2. The in-pipe lining method according to claim 1, wherein a bent pipe portion is provided in the middle of the existing pipe. 3. An end of a pull-in cord inserted through the diameter-enlarging airtight tube or the lining airtight tube before reversing, and a rear end side of the diameter-enlarging airtight tube or the lining airtight tube in the insertion direction. Connected to
The other end of the pull-in cord is inserted into the cloth cylinder, and the enlarging airtight tube or the lining airtight tube is inserted into the cloth cylinder by the reversing method, and the pulling cable is inserted. The in-pipe lining method according to claim 1, wherein the pipe is pulled in a pulling direction by a strip. 4. An end of a pull-out cord is connected to a rear end side of the diameter-enlargement airtight tube before insertion in the insertion direction, and the diameter-expansion airtight tube is inserted into the cloth cylinder by the inversion method. Then, after the cloth tubular body is preliminarily expanded in a state where the pull-out cord is pulled into the inside of the diameter-enlargement air-tight tube, the diameter-enlargement air-tight tube is moved by the pull-out cord. The inner and outer surfaces are pulled in the pull-out direction such that the inner and outer surfaces are sequentially reversed from the leading end side in the insertion direction, and the airtight tube for expanding the diameter is pulled out from the inside of the cloth cylinder.
In-pipe lining method according to any one of the above. 5. The air-tight tube for diameter expansion is also used as the air-tight tube for lining.
In-pipe lining method described in paragraph.