JP2007268874A - Lining method of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lining method of pipes for a preventing a pressurized fluid flowing in a pipeline from entering in a gap even if the gap is generated between a pipe lining material and the pipeline, and also for preventing the pressurized fluid from leaking from the pipeline. <P>SOLUTION: In the lining method of pipes, the pipe lining material 6 formed by impregnating uncured curable resin is inserted in the pipeline 10. With the pipe lining material 6 pressed against the inner wall of the pipeline 10, the pipeline 10 are repaired by curing the impregnated curable resin. The pipe lining material 6 is projected from an opening end of the pipeline 10, and a resin flange 20 is formed on a projected part so that the resin flange 20 and the pipe lining material 6 are integrated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe lining method for repairing pipes on which internal pressure acts, such as water pipes, industrial water pipes, agricultural water pipes, gas pipes, etc., and in particular pipe lining method by CIPP (CURED-IN-PLACE PIPES). It is about.

  When pipes such as water pipes and industrial water pipes are aged, the pipes are restored by lining the inner peripheral surface without digging out the aged pipes from the ground. A pipe lining method is known (see, for example, Patent Document 1).

This pipe lining method uses fluid pressure in an aged pipe lining made by impregnating an uncured thermosetting resin into a tubular resin absorbent whose outer surface is covered with a highly airtight plastic film. The thermosetting resin is cured by heating with the pipe lining material attached to the inner wall of the pipe, and the pipe is repaired in a non-excavated manner by forming a plastic pipe in the pipe. To do.
JP 62-122738 A

  However, in the above-mentioned pipe lining method, the pipe lining material does not adhere to the inner wall of the pipe line due to the curing shrinkage and thermal shrinkage of the thermosetting resin impregnated in the pipe lining material, and the pipe line and the pipe lining material are restored after repair. There may be a slight gap between the two.

  Here, FIG. 10 shows a partial cross section of a pipe line repaired by a conventional pipe lining method, and pipe lines 110, 110 ′ partially cut for lining are flanged as shown in the figure. The joint 123 was connected. In this case, when the gap is generated in each of the pipes 110 and 110 ′ lined by the pipe lining materials 106 and 106 ′, the pressure fluid flowing through the pipes 110 and 110 ′ is, for example, the end of the pipe lining material 106 as illustrated. There arises a problem of leaking out from the pinhole 110a of the pipe line 110 through the gap from the portion.

  The invention described in Patent Document 1 has been made to solve the above problem, but is not effective in the field, and effectively solves the problem of leakage of pressure fluid from the pipe line. Can not.

  The present invention has been made in order to solve the above-described problems. The purpose of the present invention is that even if a gap is generated between the pipe lining material and the pipe, the pressure fluid flowing through the pipe flows into the gap. Therefore, it is an object of the present invention to provide a pipe lining method capable of preventing the occurrence of a problem that pressure fluid leaks from a pipe line.

  In order to achieve the above object, the invention according to claim 1 is a state in which a pipe lining material impregnated with an uncured curable resin is inserted into a pipeline, and the pipe lining material is pressed against the inner wall of the pipeline. In the pipe lining method in which the curable resin impregnated therein is cured to restore the pipe line, the pipe lining material is protruded from the open end of the pipe line, and a resin flange is formed at the protruding part, and the resin The flange is integrated with the pipe lining material.

  The invention according to claim 2 is the resin according to claim 1, wherein the resin flange is a resin in which two flanges are inserted into the outer periphery of the protruding portion of the pipe lining material, and a curable resin is impregnated between both flanges. It is characterized by being formed by winding an absorbent material or sandwiching a resin putty and curing the resin absorbent material or the resin putty.

  According to a third aspect of the present invention, in the second aspect of the present invention, the two flanges are made of FRP plates, and the inner peripheral surface thereof is sanded.

  A fourth aspect of the invention is characterized in that, in the first aspect of the invention, a plurality of pipelines are connected to each other through a joint flange connected to the resin flange.

  According to a fifth aspect of the present invention, in the first aspect of the invention, a tubular mold having an inner diameter substantially equal to the inner diameter of the pipe is connected to an end of the pipe, and the pipe lining material is removed from the mold. It protrudes outward, and the mold is removed after the tube lining material is cured.

  The invention according to claim 6 is the pipe lining material impregnated with an uncured curable resin is inserted into the pipe line, and the pipe lining material is pressed against the inner wall of the pipe line and impregnated in the pipe lining material. In a pipe lining method in which a curable resin is cured to repair a pipe line, the pipe lining material is protruded from the opening ends facing each other in adjacent pipe lines, and a joint pipe having substantially the same diameter as the protruding portion is pipe lining material. It arrange | positions between both protrusion parts of this, and this joint pipe and both protrusion parts of a pipe lining material are connected airtightly, It is characterized by the above-mentioned.

  The invention described in claim 7 is characterized in that, in the invention described in claim 6, the thickness of the protruding portion of the pipe lining material is made thicker than the thickness of the other portion.

  The invention described in claim 8 is characterized in that, in the invention described in claim 6 or 7, the outer diameter of the protruding portion of the pipe lining material is substantially the same as the outer diameter of the pipe.

  According to invention of Claims 1-5, a pipe lining material is made to protrude from the opening end of a pipe line, is hardened, a resin flange is formed in the protrusion part, and both are integrated, and the opening end of an adjacent pipe line Since they are connected to each other through a flange joint that is coupled to a resin flange, even if a gap occurs in each pipeline lined with a pipe lining material, the gap is reliably sealed by the resin flange, and the pipe The pressure fluid flowing through the passage does not flow into the gap, and the conventional problem that the pressure fluid leaks out from the pinhole of the pipe does not occur.

  By the way, the method of bonding the resin flange during the curing of the pipe lining material was also conducted as an experiment. However, when the pipe lining material is cured, the pipe lining material shrinks not only in the circumferential direction but also in the length direction. The resin flange is firmly bonded to the pipe lining material during the curing of the pipe lining material. However, as the pipe lining material is cooled after the lining, the resin flange is drawn into the pipe line. However, there is a problem that the pipe is caught in the opening of the pipe and warps, or the resin flange is peeled off from the pipe lining material.

  However, according to the present invention, since the resin flange is formed on the outer periphery of the protruding portion of the pipe lining material after the pipe lining material is sufficiently cooled, the resin flange is caught by the pipe opening and warped. The problem that the flange peels from the pipe lining material does not occur.

  According to the sixth to eighth aspects of the present invention, the open ends of adjacent pipe lines are hermetically connected by both the projecting portions of the pipe lining material and the joint pipe, and the pressure fluid is connected to both the projecting portions of the pipe lining material and the joint. Even if a gap occurs in each pipeline lined with the pipe lining material because it flows inside the pipe, the pressure fluid flowing through the pipeline does not flow into the gap, and the pressure fluid flows from the pinhole of the pipeline to the outside. The conventional problem of leaking out does not occur.

[First invention]
Embodiments of the first invention will be described below with reference to the accompanying drawings.

  1 (a) to 1 (d) are partial perspective views showing various forms of a jacket, in which a strip-shaped woven fabric or woven fabric made of polyester fiber, polypropylene fiber or vinylon fiber is rounded, and ends thereof are shown in FIG. As shown in FIG. 1 (a), a tubular jacket 1 as shown in FIG. 1 (a) is obtained by overlaying as shown in a) and joining the overlapped portions by sewing. Alternatively, the belt-shaped woven fabric or woven fabric is rolled, its end is folded back as shown in FIG. 1 (b), the folded portions are alternately overlapped, and the overlapped portions are joined together by sewing. A tubular jacket 1 as shown in b) is obtained.

  Further, as shown in FIG. 1C, a seamless tubular jacket 1 may be obtained by knitting polyester fiber, polypropylene fiber or vinylon fiber into a tubular shape. In addition, as shown in FIG.1 (d), you may adhere | attach the strip | belt-shaped glass fiber 2 on the surface of the jacket 1. FIG.

  Next, a pipe lining method constructed using the jacket 1 will be described with reference to FIGS. 2 is a cross-sectional view showing the reverse insertion of the jacket into the pipe line, FIG. 3 is a cross-sectional view showing the reverse insertion of the pipe lining material into the pipe line, and FIG. 4 is an end of the pipe line during hardening of the pipe lining material. FIG. 5 is a partial cross-sectional view showing the operation of forming a resin flange on the protruding portion of the pipe lining material, and FIG. 6 is a partial cross-sectional view showing a connection state between adjacent pipe lines.

  The pipe lining method according to the present invention is suitable for repairing pipelines such as water pipes, industrial water pipes, gas pipes, etc., having a diameter of φ50 mm to φ1500 mm and a pressure fluid of 0.1 MPa to 1.0 MPa flowing inside.

  In FIG. 2, reference numeral 10 denotes a pipe line that is buried substantially horizontally in the ground, and 11 denotes a manhole that opens to the ground. When the pipe line 10 is repaired, the jacket 1 is first drawn into the pipe line 10. Deployed. Specifically, as shown in FIG. 2, the jacket 1 is housed in the pressure vessel 3, one end of the tubular plastic film 4 is folded outward, and the folded portion is attached to the outer periphery of the nozzle portion 3 a of the pressure vessel 3. The other end (inversion end) of the tubular plastic film 4 is connected to one end of the jacket 1.

  Next, when compressed air is supplied from the compressor 5 into the pressure vessel 3, the tubular plastic film 4 is inverted and inserted into the conduit 10 by air pressure, and the jacket 1 connected to the end of the tubular plastic film 4 is shown in FIG. As shown in FIG. 2, the pipe 10 is drawn into the tubular plastic film 4. In order to reinforce the tubular plastic film 4, a woven fabric or a nonwoven fabric may be welded to the outer surface of the tubular plastic film 4. As another method, the jacket 1 may be drawn directly into the conduit 10.

  Next, as shown in FIG. 3, the pipe lining material 6 is inverted and inserted into the inside of the jacket 1 provided in the pipe line 10 by water pressure. That is, when one end of the pipe lining material 6 is folded outward, the folded portion is attached to the cylindrical fixture 7, and water is injected into the folded portion of the pipe lining material 6 from the water injection hose 8, the pipe lining material 6 is Then, it is inverted and inserted into the inside of the jacket 1 in the pipe line 10 by water pressure.

  Here, the pipe lining material 6 covers the outer surface of a tubular resin absorbent material made of a polyester nonwoven fabric or a composite material in which glass fiber (glass mat) is combined with a highly airtight plastic film, and the tubular resin absorbent material. The outer diameter is set smaller by 5% to 20% than the inner diameter of the pipe 10. As the thermosetting resin, unsaturated polyester resin, epoxy resin, vinyl ester resin or the like having an elongation of 5% to 30% is used.

  By the way, when the pipe lining material 6 is inverted and inserted into the inside of the jacket 1, the inside of the tubular plastic film 4 is extracted by the vacuum pump 9 and the inside of the jacket 1 is evacuated, so that a good plastic pipe free from air accumulation is obtained. (The pipe lining material 6 is hardened) is obtained, and the inner wall of the pipe line 10 is lined and repaired by this plastic pipe.

  Thus, when the pipe lining material 6 is inverted and inserted into the inside of the jacket 1 in the pipe line 10 by water pressure, the pipe lining material 6 is applied to the inner wall of the pipe line 10 by applying water pressure inside the pipe lining material 6. In the pressed state, hot water is supplied from the hot water hose 12 shown in FIG. 4 into the pipe lining material 6, and the pipe lining material 6 is heated by this hot water. Then, the thermosetting resin impregnated in the pipe lining material 6 is cured by heat, and a plastic pipe is formed on the inner wall of the pipe line 10 by the hardened pipe lining material 6, and the inner wall of the pipe line 10 is formed by this plastic pipe. Is lined and repaired.

  Note that the tube lining material 6 may be inverted and inserted into the pipe line 10 (jacket 1) by air pressure, and the tube lining material 6 may be heated by a hot water shower or steam.

  By the way, as shown in FIG. 4, a semi-cracked tubular mold 13 is connected to the open end of the pipe 10 by a plurality of bolts 14 and nuts 15, and the pipe lining material 6 passes through the mold 13. It protrudes from the end of the lever. When the pipe lining material 6 is cured, the bolt 14 and the nut 15 are removed, and the mold 13 is removed from the pipe line 10. Then, the hardened pipe lining material 6 protrudes outward by a predetermined length from the opening end of the pipe line 10, but as shown in FIG. 5, the protruding portion is slightly smaller than the outer diameter of the pipe lining material 6. Two flanges 16 each having a circular hole having a large inner diameter are fitted into each other. The plate thickness in the vicinity of the protruding portion of the pipe lining material 6 is thicker than the plate thickness in the other portions. As a method of partially increasing the plate thickness in the vicinity of the protruding portion of the pipe lining material 6 in this way. For example, a method in which a tubular resin absorbent material having a short length impregnated with a curable resin is disposed on the outer periphery of the jacket, a method in which the plate thickness of both ends of the pipe lining material 6 is partially increased, and the like can be considered. .

  For the two flanges 16, FRP plates having a thickness of 1.0 mm to 6.0 mm are used, and in order to improve adhesion to the pipe lining material 6, the inner peripheral surface of the circular hole can be sanded. desirable. These flanges 16 are arranged so that the distance between them is 1 cm to 3 cm, and a resin absorption impregnated with an uncured curable resin in a portion between both flanges 16 on the outer peripheral portion of the cured pipe lining material 6. The material is wound and the gap between the flanges 16 is filled with the resin absorbent material 17.

  Next, as shown in FIG. 5, the outer peripheral portions of both flanges 16 are sandwiched by a plurality of clamps 18, and the inner diameter portions of both flanges 16 are fixed by a cylindrical fixing jig 19 inserted into the outer periphery of the end portion of the pipe lining material 6. In a state where the resin is sandwiched between the flange portions 10a of the pipe line 10, the curing of the curable resin impregnated in the resin absorbent material 17 is awaited.

  When the curable resin impregnated in the resin absorbent material 17 is cured, a resin flange comprising the cured resin absorbent material 17 and both flanges 16 is formed on the outer periphery of the protruding portion of the tube lining material 6 that protrudes outward from the pipe line 10. 20 is formed, and this resin flange 20 is integrated with the pipe lining material 6. The resin flange 20 may be formed on the outer periphery of the protruding portion of the pipe lining material 6 by sandwiching a resin putty in the gap between the flanges 16 and curing the resin putty.

  When the resin flange 20 is integrally formed on the outer periphery of the protruding portion of the pipe lining material 6 as described above, the clamp 18 and the fixing jig 19 are removed, and as shown in FIG. A plurality of bolt insertion holes 20a are formed by a drill, and a flange joint 23 is attached to the flange portion 10a of the pipe line 10 and the resin flange 20 by a bolt 21 passed through the bolt insertion hole 20a and a nut 22 screwed to the bolt 21.

  Next, another flange joint 24 is connected to the flange joint 23 by a plurality of bolts 25 and nuts 26, and another pipe line 10 ′ is connected to the flange joint 24 by a plurality of bolts 27 and nuts 28. The opening between 10 and the pipe line 10 ′ is sealed with flange joints 23 and 24. The connecting portion between the flange joint 23 and the resin flange 20, the connecting portion between the flange joints 23 and 24, and the connecting portion between the flange joint 24 and the flange portion 10a 'of the pipe line 10' are hermetically sealed by the packing 29, respectively. The

  As described above, in the present embodiment, the pipe lining material 6 is protruded from the opening end of the pipe line 10 and cured, and the resin flange 20 is formed at the protruding part to integrate the two. Since the opening ends of 10 and 10 'are connected via the flange joints 23 and 24 coupled to the resin flange 20, even if a gap occurs in the pipe line 10 lined with the pipe lining material 6, The gap is securely sealed by the resin flange 20. For this reason, the pressure fluid flowing through the pipes 10 and 10 ′ does not flow into the gap, and the problem that the pressure fluid leaks out from the pinhole of the pipe 10 does not occur.

  Further, the resin flange 20 is formed on the protruding portion of the pipe lining material 6 from the pipe line 10 after the lining for the pipe line 10 is completed and the hardening shrinkage and heat shrinkage of the pipe lining material 6 are completely eliminated. The lining material 6 does not shrink and the resin flange 20 is not drawn into the pipe 10.

[Second invention]
Next, an embodiment of the second invention will be described with reference to the attached drawings.

  7 is a cross-sectional view of a pipe end portion showing the pipe lining method according to the second invention, FIG. 8 is a cross-sectional view taken along line AA of FIG. 7, and FIG. 9 is a connection portion between the pipe lines in the pipe lining method. It is a fragmentary sectional view.

  Also in the pipe lining method according to the present invention, the pipe lining material 6 is inverted and inserted into the pipe line 10 by the fluid pressure as in the first invention. However, as shown in FIG. A tubular mold 30 is attached, and the pipe lining material 6 protruding from the open end passes through the mold 30 and protrudes outward from the mold 30.

  Here, as shown in FIG. 8, the mold 30 joins the flanges of the half-split tube 30a divided into two parts, and is half-cut by a bolt 31 inserted through these flanges and a nut 32 screwed into the bolt 31. The cracked pipes 30 a are joined to each other so as to be attached to the outer peripheral portion of the opening end of the pipe line 10, and the inner diameter thereof is set to be substantially the same as the outer diameter of the pipe line 10. Accordingly, the outer diameter of the protruding portion that protrudes from the opening end of the pipe line 10 of the pipe lining material 6 is set to be approximately the same as the outer diameter of the pipe line 10. The plate thickness of the protruding portion of the pipe lining material 6 is set to be thicker than the plate thickness of other portions.

  Thus, as in the first invention, a pressure is applied to the inside of the pipe lining material 6, and the pipe lining material 6 is pressed into the inner wall of the pipe line 10 while being pulled into the pipe lining material 6. Hot water is supplied from the hot water hose 12 and the pipe lining material 6 is heated by this hot water. Then, the thermosetting resin impregnated in the pipe lining material 6 is cured by heat, and a plastic pipe is formed on the inner wall of the pipe line 10 by the hardened pipe lining material 6, and the inner wall of the pipe line 10 is formed by this plastic pipe. Is lined and repaired.

  Thereafter, when the mold 30 is removed from the pipe line 10, as shown in FIG. 9, the protruding portion of the hardened pipe lining material 6 protrudes from the open end of the pipe line 10. Similarly, the protruding portion of the pipe lining material 6 ′ protrudes from the opening ends of the pipe line 10 ′ facing each other. The outer diameter of the protruding portion of the pipe lining material 6, 6 ′ is substantially the same as the outer diameter of the pipe lines 10, 10 ′, and the joint pipe 33 having the same diameter as the protruding portion is formed by the pipe lining material 6, 6 ′. The joint pipe 33 and the both projecting portions of the pipe lining material 6, 6 ′ are hermetically connected by a packing 34 and a fastening band 35. Then, the open ends of the adjacent pipe lines 10 and 10 ′ are airtightly connected to both projecting portions of the pipe lining materials 6 and 6 ′ by the joint pipe 33.

  Form frames 36, 37, 38, and 39 are respectively attached to the outer periphery of the open ends of the adjacent pipe lines 10 and 10 ′ and the outer periphery of the joint pipe 33, and the adjacent pipe lines 10 and 10 ′ are By fixing the plurality of steel bars 40 inserted through the frames 36 to 39 with the nuts 41, the joints are reinforced.

  As described above, in the present invention, the open ends of the adjacent pipes 10 and 10 'are hermetically connected by the protruding portions of the pipe lining materials 6 and 6' and the joint pipe 33, and the pressure fluid is pipe lining. Since both the projecting portions of the materials 6 and 6 ′ and the inside of the joint pipe 33 flow, even if a gap is generated in each of the conduits 10 and 10 ′ lined by the tube lining materials 6 and 6 ′, the conduits 10 and 10. The pressure fluid flowing through 'does not flow into the gap, and the problem that the pressure fluid leaks out from the pinhole of the pipes 10 and 10' does not occur.

(A)-(d) is a fragmentary perspective view which shows the various forms of a jacket. It is sectional drawing which shows inversion insertion into the pipe line of a jacket in the pipe lining construction method which concerns on 1st invention. It is sectional drawing which shows inversion insertion into the pipe line of a pipe lining material in the pipe lining construction method which concerns on 1st invention. It is a fragmentary sectional view which shows the state of the pipe line end part during pipe lining material hardening in the pipe lining construction method which concerns on 1st invention. It is a fragmentary sectional view which shows the operation | work which forms the resin flange in the protrusion part of a pipe lining material in the pipe lining construction method which concerns on 1st invention. It is a fragmentary sectional view which shows the connection state of the adjacent pipe lines in the pipe lining construction method which concerns on 1st invention. It is sectional drawing of the pipe line end part which shows the pipe lining construction method concerning 2nd invention. It is the sectional view on the AA line of FIG. It is a fragmentary sectional view which shows the connection part of the pipe lines in the pipe lining construction method which concerns on 2nd invention. It is a fragmentary sectional view of the pipe line repaired by the conventional pipe lining construction method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Jacket 2 Glass fiber 3 Pressure vessel 4 Tubular plastic film 5 Convolver 6, 6 'Pipe lining material 7 Fixing tool 8 Water injection hose 9 Vacuum pump 10, 10' Pipe line 11 Manhole 12 Hot water hose 13 Formwork 16 Flange 17 Resin absorbent material 18 Clamp 19 Fixing jig 20 Resin flange 23, 24 Flange joint 29 Packing 30 Mold frame 33 Joint pipe 34 Packing 35 Tightening band 36 to 39 Mold frame 40 Steel bar

Claims (8)

A pipe lining material impregnated with an uncured curable resin is inserted into the pipe line, and the pipe lining material is pressed against the inner wall of the pipe line, and the curable resin impregnated therein is cured to obtain a pipe. In pipe lining method to repair the road,
A pipe lining method characterized by projecting the pipe lining material from an open end of a pipe line, forming a resin flange at the projecting portion, and integrating the resin flange with the pipe lining material.   The resin flange includes two flanges inserted into the outer periphery of the protruding portion of the pipe lining material, and a resin absorbent material impregnated with a curable resin is wound or sandwiched between both flanges, and the resin absorbent material or The pipe lining method according to claim 1, wherein the pipe lining method is formed by curing a resin putty.   3. The pipe lining method according to claim 2, wherein the two flanges are made of FRP plates and the inner peripheral surface thereof is sanded.   The pipe lining method according to claim 1, wherein a plurality of pipe lines are connected to each other through a joint flange connected to the resin flange.   A tubular mold having an inner diameter substantially equal to the inner diameter of the pipe is connected to an end of the pipe, the pipe lining material is protruded outward from the mold, and the pipe lining is cured and then the mold The pipe lining method according to claim 1, wherein the pipe lining method is removed. A pipe lining material impregnated with an uncured curable resin is inserted into the pipe line, and the pipe lining material is pressed against the inner wall of the pipe line, and the curable resin impregnated therein is cured to obtain a pipe. In the pipe lining method to repair the road,
The pipe lining material is protruded from the opposite open ends of the adjacent pipe lines, and a joint pipe having substantially the same diameter as the protrusion is disposed between the two protrusion parts of the pipe lining material, and the joint pipe and the pipe lining material A pipe lining method characterized by airtightly connecting both protrusions.   7. The pipe lining method according to claim 6, wherein the thickness of the projecting portion of the pipe lining material is made thicker than the thickness of other portions.   The pipe lining method according to claim 6 or 7, wherein the outer diameter of the protruding portion of the pipe lining material is substantially the same as the outer diameter of the pipe line.

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