JP2008284735A - Method of installing regeneration pipe and sealing implement used for the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the insertion resistance efficiently during insertion of a regeneration pipe into an existing pipe. <P>SOLUTION: During insertion of a regeneration pipe 32 into an existing pipe 30, a sealing implement 10 is arranged at a position corresponding to an insertion-resistant portion, e. g. a bent portion 36, of the existing pipe 30 to form a sealing space 48 in a part of the inside of the regeneration pipe 32. After a part of the regeneration pipe 32 is softened by heating the sealing space 48, the regeneration pipe 32 is towed over a specified distance so as to allow the softened part of the regeneration pipe 32 to pass through the bent portion 36. While the heating position for the regeneration pipe 32 is changed by transferring the sealing implement 10 successively to backward positions by the distance of towing of the regeneration pipe 32, the regeneration pipe 32 is inserted into the existing pipe 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for laying a rehabilitated pipe and a sealing tool used therefor, and more particularly to a method for laying a rehabilitated pipe in which a rehabilitated pipe is laid in an existing pipe and a sealing tool used therefor.

  Conventionally, as a method for rehabilitating an aging existing pipe, a method of inserting a rehabilitation pipe into an existing pipe and laying it is known. In addition, when the existing pipe includes a bent portion, the insertion resistance of the rehabilitated pipe increases at the bent portion.Therefore, there is a method of inserting the thermoplastic rehabilitated pipe into the existing pipe while being softened by heating. Adopted. For example, in the technique of Patent Document 1, a heated fluid is supplied from the other end opening of the rehabilitating tube, and the heated fluid is discharged through a connecting member connected to the one end opening of the rehabilitating tube, so that the rehabilitating tube is already installed. The entire rehabilitation tube is heated while being drawn into the tube.

Patent Document 2 discloses a method in which a heating mechanism is provided in a pulling jig for pulling the rehabilitation pipe, and only the tip of the rehabilitation pipe is heated and softened to insert the rehabilitation pipe into the existing pipe. Has been. When inserting the rehabilitation pipe into the existing pipe, a large insertion resistance is generated when the leading portion of the rehabilitation pipe passes through the bent portion of the existing pipe. Therefore, if the tip of the rehabilitation pipe is heated as in the technique of Patent Document 2, the initial large insertion resistance can be kept low.
JP 2006-283903 A JP 2006-43983 A

  In the technique of Patent Document 1, since the entire rehabilitation pipe is heated when the rehabilitation pipe is inserted into the existing pipe, the rehabilitation pipe is heated to a portion unrelated to the insertion resistance of the rehabilitation pipe, and the efficiency is poor. In particular, in the method of inserting the rehabilitated pipe members into the existing pipe while forming the rehabilitated pipe by sequentially connecting the rehabilitated pipe members at the site, the rehabilitated pipe must be reheated every time the rehabilitated pipe member is connected. The longer the tube is extended, the longer it takes to heat the rehabilitation tube. In addition, since it is necessary to connect the rehabilitation pipe member at room temperature, when heating the entire rehabilitation pipe, it is necessary to wait until the end (connection part) of the rehabilitation pipe falls to room temperature, which takes time. .

  Moreover, in the technique of Patent Document 2, it is possible to suppress the initial large insertion resistance, but because the heating position of the rehabilitation tube is fixed only at the tip, it is not possible to heat other parts of the rehabilitation tube, It is not possible to suppress the insertion resistance that occurs when an unheated part passes through a bent portion of an existing pipe.

  Therefore, a main object of the present invention is to provide a rehabilitating pipe laying method and a sealing tool used for the rehabilitating pipe that can efficiently suppress the insertion resistance when the rehabilitating pipe is inserted into the existing pipe.

  The present invention employs the following configuration in order to solve the above problems. The reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

  The invention of claim 1 is a laying method of a rehabilitating pipe, wherein the rehabilitating pipe is inserted into the existing pipe while changing the heating position of the rehabilitating pipe by changing the arrangement position of the sealing tool.

  In the invention of claim 1, when the rehabilitation pipe (32) is inserted and laid in the existing pipe (30), the rehabilitation pipe is heated by changing the position of the sealing tool (10) arranged in the rehabilitation pipe. The position, that is, the part of the rehabilitation tube to be softened is sequentially changed. For example, as the rehabilitation pipe is inserted into the existing pipe, the portion of the rehabilitation pipe that causes insertion resistance changes, and accordingly, the heating position of the rehabilitation pipe is changed accordingly.

  According to the invention of claim 1, the entire rehabilitation pipe is not heated, but the heating position of the rehabilitation pipe is sequentially changed to heat and soften the part of the rehabilitation pipe that causes insertion resistance. The insertion resistance when inserting the rehabilitation tube can be efficiently suppressed.

  The invention of claim 2 is dependent on the invention of claim 1, and changes the heating position of the rehabilitation pipe in correspondence with the position of the insertion resistance portion of the existing pipe.

  In the invention of claim 2, the heating position of the rehabilitation pipe (32) is sequentially changed in correspondence with the position of the insertion resistance section (36) such as the bent section of the existing pipe (30). For example, the arrangement position of the sealing tool (10) is changed and the heating position of the rehabilitating tube is changed so that the part of the rehabilitating tube located in the middle of the bent part or a predetermined distance before the bent part can be softened. Therefore, similarly to the first aspect of the invention, it is possible to efficiently suppress the insertion resistance when inserting the rehabilitation pipe into the existing pipe.

  The invention of claim 3 is a method for laying a rehabilitated pipe in which the rehabilitated pipe is inserted into the existing pipe, and (a) a sealing tool is disposed at a position corresponding to the insertion resistance portion of the existing pipe to partially (B) The sealed space formed in step (a) is heated to partially soften the rehabilitated pipe, and (c) the renewed pipe partially softened in step (b) is placed in the existing pipe. Laying the rehabilitated pipe, inserting a predetermined distance, and (d) repeating steps (a) to (c) as necessary to insert the rehabilitated pipe into the existing pipe over the entire length of the rehabilitated part of the existing pipe. Is the method.

  In the invention of claim 3, first, in step (a), the sealing tool (10) is placed at a position in the rehabilitation pipe (32) corresponding to the insertion resistance part (36) such as a bent part of the existing pipe (30). The sealing space (48, 98) is formed in a part in the rehabilitation pipe using the sealing tool. In step (b), the heated fluid is fed into the sealed space formed in step (a), and the portion of the rehabilitating tube that forms the sealed space is heated to partially soften the rehabilitating tube. In step (c), the rehabilitated pipe partially softened in step (b) is inserted into the existing pipe for a predetermined distance. As a result, the softened portion of the rehabilitation tube passes through the insertion resistance portion of the existing tube. In step (d), steps (a) to (c) are repeated as appropriate, and the portions of the rehabilitating tube that cause insertion resistance change sequentially as the rehabilitating tube is inserted into the existing tube. However, the rehabilitation pipe is laid in the existing pipe over the entire length of the rehabilitation part of the existing pipe.

  According to the invention of claim 3, the entire rehabilitation pipe is not heated, but the heating position of the rehabilitation pipe is sequentially changed to heat and soften the part of the rehabilitation pipe that causes insertion resistance. The insertion resistance when inserting the rehabilitation tube can be efficiently suppressed.

  The invention according to claim 4 is a sealing tool used for partially heating the rehabilitation pipe when the rehabilitation pipe is inserted into the existing pipe, and can be expanded and contracted, and the first sealing body It is a sealing tool provided with the channel | path part which is provided in a body and sends a heating fluid into the sealing space formed in a rehabilitation pipe | tube using the said 1st sealing body.

  In the invention of claim 4, the sealing tool (10) is used for heating and softening a part of the rehabilitation pipe when inserting the rehabilitation pipe (32) into the existing pipe (30). The sealing tool includes a first sealing body (12) and a passage portion (14). For example, the first sealing body expands when a fluid such as compressed air is supplied to the inside thereof, and contracts when the fluid inside is removed. For example, the passage portion is provided so as to penetrate the first sealing body, and a heating fluid such as steam is fed into the sealing space (48) formed in the rehabilitation pipe using the first sealing body. . When partially heating the rehabilitation pipe using this sealing tool, for example, one end of the rehabilitation pipe is sealed using another member (46), and the sealing tool is disposed at a desired position in the rehabilitation pipe. The first sealing body is expanded to form a sealed space in the rehabilitation pipe. Thereafter, the heated fluid is sent into the sealed space through the passage portion, and the portion of the rehabilitating tube that forms the sealed space is heated. Moreover, since the arrangement | positioning position of a sealing tool can be changed if the 1st sealing body is shrunk, a sealing space can be formed in the desired position in a rehabilitation pipe | tube.

  According to invention of Claim 4, the heating position of a rehabilitation pipe | tube can be changed freely.

  The invention of claim 5 is dependent on the invention of claim 4, and is provided in front of the first sealing body and capable of expanding and contracting, and the first sealing body and the second sealing body. The body further includes a coupling body that couples the body, and the passage portion sends the heating fluid into the sealed space formed in the rehabilitation pipe using the first sealing body and the second sealing body.

  In invention of Claim 5, a sealing tool (10) is further provided with the 2nd sealing body (82). The second sealing body is connected to the first sealing body (80) at a predetermined interval by the connecting body (90), and, for example, expands and contracts in conjunction with the first sealing body. The predetermined interval between the first sealing body and the second sealing body is set in consideration of the length of the insertion resistance portion (36) such as a bent portion of the existing pipe (30), for example. When the sealing body is arranged at a desired position in the rehabilitation pipe and the first sealing body and the second sealing body are expanded, a sealed space ( 98) is formed. That is, the sealing space can be formed at a desired position in the rehabilitation pipe without using another member (46). Therefore, if a heating fluid is fed into the sealed space via the passage portion (92), only a desired portion of the rehabilitation pipe can be heated.

  According to the present invention, instead of heating the entire rehabilitation pipe, the heating position of the rehabilitation pipe is sequentially changed to heat the part of the rehabilitation pipe that causes insertion resistance, so when inserting the rehabilitation pipe into the existing pipe Insertion resistance can be efficiently suppressed.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  1-4, in the laying method of the rehabilitation pipe | tube which is one Example of this invention, the rehabilitation pipe | tube 32 is changed, changing the heating position of the rehabilitation pipe | tube 32 using the sealing tool 10 shown in FIG. It is inserted into the existing pipe 30 and laid.

  As shown in FIG. 5, the sealing tool 10 includes a first sealing body 12 and a passage portion 14. The first sealing body 12 is formed in a bag shape by an elastic material such as heat-resistant rubber. An air hole 16 for taking in and out a fluid such as compressed air is formed at an appropriate position on the rear side of the first sealing body 12, and the air hole 16 is connected to a fluid supply pipe 50 described later. A pipe connection 18 is formed. Although not shown in the drawings, a suitable connection method such as a hose band tightening method, a nut tightening method, or a one-touch method may be used as a connection method between the pipe connecting portion 18 and the fluid supply pipe 50. When fluid is supplied to the inside of the first sealing body 12 through the air holes 16, the first sealing body 12 expands into a shape suitable for the shape of the rehabilitation pipe 32, for example, a hollow cylindrical shape, and contracts when the fluid inside is removed. .

  The passage portion 14 is formed of a metal such as stainless steel, and is provided in the first sealing body 12 so as to penetrate the inside of the first sealing body 12 in the axial direction. The passage portion 14 is formed in a cylindrical shape having openings at both ends, and the passage formed by the inner wall surface 20 serves as a heating fluid passage for feeding the heating fluid forward of the first sealing body 12. Further, a thread groove 22 for connecting a push rod 52 described later is formed at one end of the passage portion 14. In FIG. 5, the passage portion 14 is shown so as to penetrate the vicinity of the center of the first sealing body 12 in the axial direction. However, the present invention is not limited to this, and the passage portion 14 is formed of the first sealing body 12. It can be provided at an appropriate position. For example, the passage portion 14 can be provided so as to penetrate the vicinity of the side wall of the first sealing body 12 in the axial direction.

  As will be described in detail later, such a sealing tool 10 forms a sealed space 48 in the rehabilitation pipe 32 by expanding the first sealing body 12, and the passage portion 14 is formed in the sealed space 48. The portion of the rehabilitating tube 32 that forms the sealed space 48 is heated by feeding a heating fluid through the heating fluid. Moreover, if the 1st sealing body 12 is shrunk, since the arrangement position of the sealing tool 10 can be changed freely, the sealing space 48 can be formed in the desired position in the rehabilitation pipe | tube 32. FIG. That is, the heating position of the rehabilitation pipe 32 can be freely changed by using the sealing tool 10.

  1-4, the laying method of the rehabilitation pipe | tube which inserts the rehabilitation pipe | tube 32 in the existing pipe | tube 30 using the sealing tool 10 shown in FIG. 5 is shown below. In this embodiment, the rehabilitated pipe member 34 is inserted into the existing pipe 30 while the rehabilitated pipe member 34 is sequentially connected at the work site to form the rehabilitated pipe 32, thereby renewing the existing pipe 30. To do.

  The existing pipe 30 is a reinforced concrete pipe or an iron pipe buried in the soil, and has a bent portion 36 in a part thereof. In this embodiment, a bent portion (bent tube portion) 36 is illustrated as an insertion resistance portion of the existing pipe 30, but the insertion resistance portion has a stepped portion, for example, a passage that is temporarily narrow in the existing pipe 30. Existing pipes in which the insertion resistance of the rehabilitated pipe 32 is increased, such as a pinching part, a bulge produced at a position of a branch pipe part formed in the existing pipe 30, and a convex part produced by some damage of the existing pipe 30 Includes 30 parts. Moreover, parts other than the bending part 36 of the existing pipe 30 shall be a straight pipe. The existing pipe 30 has an inner diameter of, for example, 100 mm to 500 mm.

  The rehabilitation pipe member 34 is formed of a synthetic resin having thermoplasticity such as polyethylene, and is formed in a straight tube having a circular cross-sectional shape. The outer diameter of the rehabilitation pipe member 34 is set to be smaller than the inner diameter of the existing pipe 30, and the axial length thereof is, for example, 2 to 5 m.

  When the laying operation of the rehabilitated pipe 32 is started, first, the first shaft 38 and the second shaft 40 are provided at positions corresponding to both ends of the rehabilitated portion of the existing pipe 30, and the existing pipe 30 at those positions is cut. Remove to the outside.

  The first shaft 38 has a length (for example, 7 m) longer than the length of the rehabilitated pipe member 34 (2 to 5 m in this embodiment), and is provided at a position corresponding to one end of the existing pipe 30 to be rehabilitated. It is done. The reason why the first shaft 38 having a length longer than the length of the rehabilitated pipe member 34 is provided in order to connect the rehabilitated pipe member 34 in the first shaft 38 as will be described in detail later. is there. Moreover, the 2nd shaft 40 is provided in the position according to the other end of the existing pipe 30 to rehabilitate. The second shaft 40 does not need to be as large as the first shaft 38, and may be wide enough for an operator to enter the interior and work appropriately.

  When the first shaft 38 and the second shaft 40 are provided, the foreign matter in the existing pipe 30 is removed and cleaned. In addition, the length of the first pipe 38 to the bent portion 36, the bending, or the like by conducting a preliminary survey of the structure of the existing pipe 30 using a TV camera car or the like, or referring to the laying diagram of the existing pipe 30, etc. The length of the part 36 itself is grasped.

  Next, in the first shaft 38, the rehabilitation pipe member 34 is sequentially connected to the preceding rehabilitation pipe member 34 to form the rehabilitation pipe 32, and the top portion of the rehabilitation pipe 32 is positioned immediately before the bent portion 36. The rehabilitated tube 32 is inserted into the existing tube 30 until it reaches. The portion of the existing pipe 30 from the first resistance 38 to the bent portion 36 is a straight tube, and the insertion resistance of the rehabilitated tube 32 is small, so that the leading portion of the rehabilitated tube 32 reaches the position immediately before the bent portion 36. Until then, the rehabilitation tube 32 is not heated.

  Specifically, first, the sealing tool 10, the rehabilitation pipe member 34, the butt fusion machine (not shown), and the like are carried into the first shaft 38. Further, a winch 42 is prepared on the ground on the second shaft 40 side, and a traction tool 44 such as a wire or a rope connected to the winch 42 is connected to the first shaft 38 side from the second shaft 40 through the existing pipe 30. Leave until.

  Subsequently, a fixture 46 is attached to the front side (that is, the second resistance 40 side) end of the first rehabilitation pipe member 34, and a traction tool 44 passed through the existing pipe 30 is attached to the fixture 46. . The fixture 46 is used to attach the traction tool 44 to the first rehabilitation pipe member 34 and has a function of sealing the opening at the front end of the first rehabilitation pipe member 34.

  Then, the first rehabilitation pipe member 34 is pulled using the winch 42 and the traction tool 44 and inserted into the existing pipe 30 by a predetermined distance. At this time, the rear side of the first rehabilitated pipe member 34 (that is, the first rehabilitated pipe member 34) by the length required when the second rehabilitated pipe member 34 is connected to the first rehabilitated pipe member 34 (butt fusion). The end of the vertical shaft 38 side is projected from the existing pipe 30 into the first vertical shaft 38. Subsequently, by using a butt fusion machine, the front end portion of the second rehabilitation pipe member 34 is connected to the rear end portion of the first rehabilitation pipe member 34, and the second rehabilitation pipe member 34. A rehabilitating pipe 32 is formed by sequentially connecting the front end of the third rehabilitating pipe member 34 to the rear end, and the rehabilitating pipe member 34 subsequent to the preceding rehabilitating pipe member 34. However, the rehabilitating tube 32 is inserted into the existing tube 30 until the head portion of the rehabilitating tube 32 (that is, the end portion on the front side of the first rehabilitating tube member 34) reaches the position immediately before the bent portion 36.

  When the rehabilitation pipe 32 is inserted to a position just before the bent portion 36, the subsequent rehabilitation pipe member 34 is connected to the rehabilitation pipe 32. Thereafter, a sealing space 48 is formed in a part of the rehabilitation pipe 32 using the sealing tool 10, and a heating fluid such as steam is supplied to the sealing space 48 to heat a part of the rehabilitation pipe 32. . And the rehabilitation pipe | tube 32 of the state heated and softened is pulled by predetermined distance, and the bending part 36 of the existing pipe | tube 30 is allowed to pass through.

  Specifically, first, the fluid supply pipe 50 is connected to the sealing tool 10 via the pipe connecting portion 18 of the first sealing body 12. Further, the push rod 52 is connected to the passage portion 14.

  As shown in FIG. 6, the push-in bar 52 is made of metal such as stainless steel, and is formed in a cylindrical shape having openings at both ends, and the inside 54 serves as a passage through which the heating fluid passes. At one end of the push rod 52, a screw thread 58 is formed which is screwed into the screw groove 22 of the passage portion 14 and the screw groove 56 formed at the other end of the push rod 52. Further, the thread groove 56 formed at the other end of the push rod 52 can be screwed to a thread (not shown) formed at the end of the heated fluid supply pipe 60. That is, the push rod 52 can be connected to each of the push rod 52 itself, the passage portion 14, and the heating fluid supply pipe 60. In addition, the push rod 52 has a length of, for example, 1 to 2 m, and by connecting the push rods 52 to each other, an appropriate length, that is, a length capable of pushing the sealing body 10 to a desired position. It is possible to adjust. In addition, the connection method between the push rods 52 and the connection method between the push rods 52 and the passage portion 14 or the heating fluid supply pipe 60 are not limited to the screw type as described above, and an appropriate method such as a one-touch type is used. Can do. For example, a coupler (registered trademark, see FIG. 13) may be used.

  When the fluid supply pipe 50 and the pushing rod 52 are connected to the sealing tool 10, the pushing tool 52 is used to push the sealing tool 10 into the rehabilitation pipe 32, and a position corresponding to the bent portion 36 of the existing pipe 30, for example, bending. The sealing tool 10 is arranged at a position in front of the portion 36 by a length corresponding to the length of the rehabilitation pipe member 34. If the length of one push bar 52 is insufficient, another push bar 52 may be further connected to adjust the length. In this way, the push rod 52 is connected and its length is adjusted by utilizing the space between the pipe end of the rehabilitation pipe 32 projecting from the existing pipe 30 and the wall surface of the first resisting plate 38. Since the sealing tool 10 is pushed into the rehabilitation pipe 32, if one long push rod 52 is used, it is necessary to make the above-mentioned space larger by the length of the long push rod 52. As a result, the first resister having a long length is used. This is because it is necessary to provide 38.

  When the sealing tool 10 is disposed in the rehabilitation pipe 32, next, a fluid is supplied from the fluid supply machine 62 such as a compressor to the inside of the first sealing body 12 of the sealing tool 10 through the fluid supply pipe 50. The first sealing body 12 is expanded. As a result, the first sealing body 12 is pressed over the entire circumference of the inner surface of the rehabilitation pipe 32, and a sealed space 48 defined by the first sealing body 12, the fixture 46 and the rehabilitation pipe 32 is formed. Is done.

  Subsequently, the heating fluid supply pipe 60 is connected to the other end of the push rod 52, and the heating fluid is supplied to the sealed space 48. That is, the heating fluid from the heating fluid supplier 64 is supplied to the sealed space 48 via the heating fluid supply pipe 60, the inside 54 of the push-in rod 52, and the passage portion 14 of the sealing tool 10 (see FIG. 1). ). When the sealed space 48 is heated by the heated fluid and the portion of the rehabilitating tube 32 forming the sealed space 48 is softened, the rehabilitating tube 32 is fixed to a predetermined distance, for example, the rehabilitating tube member 34 using the winch 42 and the traction tool 44. Is pulled by the length of (see FIG. 2). Thereby, the site | part near the head of the rehabilitation pipe | tube 32 passes the bending part 36 of the existing pipe | tube 30 in the softened state.

  When the rehabilitation pipe 32 is pulled by a predetermined distance, the supply of the heating fluid to the sealing space 48 is stopped, and the fluid inside the first sealing body 12 is drawn to contract the first sealing body 12, The sealing tool 10 is extracted from the rehabilitation pipe 32 by using the push rod 52. Then, after further connecting the rehabilitation pipe member 34 following the rehabilitation pipe 32 (see FIG. 3), the sealing tool 10 is pushed again into the rehabilitation pipe 32 using the push-in rod 52, and the bent portion 36 of the existing pipe 30. The sealing tool 10 is arrange | positioned in the position corresponding to (refer FIG. 4). The position corresponding to the bent portion 36 is the same as the above-described position (for example, a position in front of the bent portion 36 by a length corresponding to the length of the rehabilitated pipe member 34). The arrangement position of the sealing tool 10 changes, and the heating position of the rehabilitation pipe 32 changes (in this embodiment, the heating position spreads backward).

  Thereafter, the same operation, that is, the formation of the sealed space 48, the heating and softening of the rehabilitated tube 32, the pulling of the rehabilitated tube 32, the removal of the sealing tool 10, and the connection of the rehabilitated tube member 34 are repeated as appropriate. Rehabilitation pipe 32 is laid over the entire length of 30 rehabilitation parts.

  In this way, as the rehabilitated pipe 32 is inserted into the existing pipe 30, the reheat pipe 32 passes through the bent portion 36 of the existing pipe 30 by changing (expanding) the heating position of the rehabilitated pipe 32 backward. Is always in a softened state, and the insertion resistance when the rehabilitated tube 32 is inserted into the existing tube 30 having the bent portion 36 (that is, the insertion resistance portion) can be appropriately suppressed. Further, every time the rehabilitating pipe member 34 is connected, the entire rehabilitating pipe 32 is not heated, but the part causing the insertion resistance of the rehabilitating pipe 32 is heated, which is efficient. That is, since the space to heat is small compared with the case where the whole renovation pipe | tube 32 is heated, a heating fluid spreads quickly in the sealing space 48, and the time which the renovation pipe | tube 32 requires for heating can be shortened.

  Further, since the rear end of the rehabilitating pipe 32 is not heated, it is not necessary to wait for the rehabilitating pipe 32 to drop to room temperature when the rehabilitating pipe member 34 is connected, and the working time can be greatly shortened.

  In addition, in the sealing tool 10 shown in FIG. 5, although the channel | path part 14 was provided so that the inside of the 1st sealing body 12 might be penetrated, it is not limited to this. For example, as shown in FIG. 7, the first sealing body 12 can be formed in a hollow donut shape (when expanded), and the passage portion 14 can be fitted into a hole 70 formed near the center thereof. . In addition, the wall of the first sealing body 12 forming the hole 70 can function as the passage portion 14. That is, instead of forming the first sealing body 12 and the passage portion 14 as separate bodies, the first sealing body 12 and the passage portion 14 can be integrally formed in advance.

  Further, as shown in FIG. 8, a passage portion 14 can be provided outside the first sealing body 12. However, in this case, when the first sealing body 12 is expanded, a portion where the first sealing body 12 is not pressed against the circumferential direction of the inner surface of the rehabilitation pipe 32 is generated, and the sealing space 48 is appropriately formed. There is a risk that it cannot be formed. In order to prevent this, for example, at the outer surface of the passage portion 14, at least when the first sealing body 12 is expanded, a portion that comes into contact with the inner surface of the rehabilitation pipe 32 has a flexible sheet-like shape such as heat-resistant rubber. It is good to affix the obstruction | occlusion material 72 of this and to ensure the airtightness in the site | part.

  Moreover, in the sealing tool 10 shown in FIG. 5, although the fluid supply pipe | tube 50 and the 1st sealing body 12 were connected via the pipe connection part 18, the fluid supply pipe | tube 50 and the 1st sealing body 12 are It can also be formed integrally in advance.

  In the rehabilitation pipe laying method according to another embodiment of the present invention shown in FIG. 9, the rehabilitation pipe 32 is placed in the existing pipe 30 while changing the heating position of the rehabilitation pipe 32 using the sealing tool 10 shown in FIG. Lay down. In addition, the same number is attached | subjected about the part which is common in the laying method of the rehabilitation pipe | tube shown in FIGS. 1-4, and the overlapping description is abbreviate | omitted or simplified.

  The sealing tool 10 shown in FIG. 10 includes a first sealing body 80 and a second sealing body 82, and the first sealing body 80 and the second sealing body 82 are interposed via a cylindrical communication portion 84. The inside communicates with each other. The first sealing body 80 and the second sealing body 82 are formed in a bag shape such as a hollow cylindrical shape (when expanded) by an elastic material such as heat-resistant rubber, and when the sealing tool 10 is inserted into the rehabilitation pipe 32. The second sealing body 82 is positioned in front of the first sealing body 80.

  An air hole 86 for taking in and out a fluid such as compressed air is formed at an appropriate position on the rear side of the first sealing body 80, and a pipe connection connected to the fluid supply pipe 50 is formed in the air hole 86. A portion 88 is formed. When the fluid is supplied to the inside of the first sealing body 80 through the air hole 86, the fluid is also supplied to the inside of the second sealing body 82 through the communication portion 84, and the first sealing body 80 and The second sealing body 82 expands in conjunction with it. Further, when the fluid is removed through the air hole 86, the first sealing body 80 and the second sealing body 82 contract.

  Moreover, between the 1st sealing body 80 and the 2nd sealing body 82, the connection body 90 for connecting these and holding a predetermined space | interval is provided. The connecting body 90 is formed in a rod shape by a soft material such as heat-resistant rubber, has flexibility to be inserted into the bent portion 36 of the existing pipe 30, and the first when the sealing tool 10 is pushed into the rehabilitation pipe 32. It has the hardness which can hold | maintain the predetermined space | interval between the sealing body 80 and the 2nd sealing body 82. FIG. The length of the coupling body 90, that is, the predetermined interval between the first sealing body 80 and the second sealing body 82, depends on the length of the bent portion 36 of the existing pipe 30, the length of the rehabilitation pipe member 34, and the like. For example, the length is set by adding the length of the rehabilitation pipe member 34 to the length of the bent portion 36.

  Although not shown in the figure, the connecting body 90 is formed in a cylindrical shape, and the inside of the connecting body 90 is used as a fluid passage that allows the insides of the first sealing body 80 and the second sealing body 82 to communicate with each other. You can also That is, instead of providing the communication portion 84 and the connection body 90 separately, the connection body 90 may also serve as the communication portion 84.

  The first sealing body 80 is provided with a passage portion 92 as in the sealing tool 10 shown in FIG. The passage portion 92 is formed of a metal such as stainless steel and penetrates the inside of the first sealing body 80 in the axial direction. A passage formed by the inner wall surface 94 of the passage portion 92 serves as a heating fluid passage for feeding a heating fluid between the first sealing body 80 and the second sealing body 82. A thread groove 96 for connecting the push-in rod 52 is formed at one end of the passage portion 92. The passage portion 92 may be provided in the first sealing body 80 in the same format as the sealing tool 10 shown in FIG. 7 or FIG.

  By using the sealing tool 10 as shown in FIG. 10, the sealing space 98 can be formed at a desired position in the rehabilitation pipe 32 without using other members, and only a desired portion of the rehabilitation pipe 32 is heated. be able to.

  Returning to FIG. 9, when the rehabilitated pipe 32 is laid in the existing pipe 30 using the sealing tool 10 shown in FIG. 10, first, in the same manner as the existing pipe laying method shown in FIGS. 1 to 4. The rehabilitation pipe 32 is inserted into the existing pipe 30 until the leading portion of the rehabilitation pipe 32 reaches the position immediately before the bent portion 36 of the existing pipe 30, and the subsequent rehabilitation pipe member 34 is connected to the rehabilitation pipe 32. In addition, the fluid supply pipe 50 and the push rod 52 are connected to the first sealing tool 80.

  Next, the sealing tool 10 is pushed into the rehabilitation pipe 32 using the push-in rod 52, and the position corresponding to the bent portion 36 of the existing pipe 30, in this case, the second sealing tool 82 is attached to the rehabilitation pipe 32. The sealing tool 10 is arrange | positioned so that it may be located near the head. Then, the fluid is supplied into the first sealing body 80 from the fluid supply device 62 such as a compressor through the fluid supply pipe 50. The fluid supplied to the first sealing body 80 also flows into the second sealing body 82 via the communication portion 84, and the first sealing body 80 and the second sealing body 62 are expanded. As a result, the first sealing body 80 and the second sealing body 82 are in pressure contact with the inner surface of the rehabilitating pipe 32 at a predetermined interval over the entire circumference, so that the first sealing body 80 and the second sealing body A sealed space 98 defined by the body 82 and the rehabilitation tube 32 is formed.

  Subsequently, the heating fluid supply pipe 60 is connected to the other end of the push rod 52 to supply the heating fluid to the sealed space 98. That is, the heating fluid from the heating fluid supplier 64 is supplied to the sealed space 98 via the heating fluid supply pipe 60, the inside 54 of the push-in rod 52, and the passage portion 92 of the sealing tool 10. When the sealed space 98 is heated by the heated fluid and the portion of the rehabilitating tube 32 forming the sealed space 98 is softened, the rehabilitating tube 32 is fixed to a predetermined distance, for example, the rehabilitating tube member 34 by using the winch 42 and the traction tool 44. Tow the length of. Thereby, the site | part near the head of the rehabilitation pipe | tube 32 passes the bending part 36 of the existing pipe | tube 30 in the softened state.

  When the rehabilitation pipe 32 is pulled by a predetermined distance, the supply of the heated fluid to the sealed space 98 is stopped, and the fluid inside the first sealed body 80 and the second sealed body 82 is drained to remove the first seal. The stopper 80 and the second sealing body 82 are contracted, and the sealing tool 10 is extracted from the rehabilitation pipe 32 using the push-in rod 52.

  Then, after further connecting the rehabilitating pipe member 34 following the rehabilitating pipe 32, the sealing tool 10 is pushed again into the rehabilitating pipe 32 by using the push-in rod 52, so that it is in a position corresponding to the bent portion 36 of the existing pipe 30. The sealing tool 10 is disposed. For example, at that time, when the head portion of the rehabilitation pipe 32 is located in the middle of the bent portion 36 or immediately after the bent portion 36, the sealing is performed so that the second sealing body 82 is located near the head of the rehabilitation tube 32. The tool 10 is arranged. Further, for example, when the head portion of the rehabilitating tube 32 has passed the bent portion 36, the sealing tool 10 is disposed in the rehabilitated tube 32 so that the second sealing body 82 is positioned immediately after the bent portion 36. (See FIG. 9). As a result, the heating position of the rehabilitation pipe 32 changes backward.

  Thereafter, the same operation, that is, the formation of the sealed space 98, the heat softening of the rehabilitated tube 32, the pulling of the rehabilitated tube 32, the removal of the sealing tool 10, and the connection of the rehabilitated tube member 34 are repeated as appropriate. Rehabilitation pipe 32 is laid over the entire length of 30 rehabilitation parts.

  As described above, as the rehabilitation pipe 32 is inserted into the existing pipe 30, the heating position of the rehabilitation pipe 32 is changed to the rear, and only the portion causing the insertion resistance of the rehabilitation pipe 32 is heated. The insertion resistance when inserting the rehabilitation pipe | tube 32 in the existing pipe | tube 30 which has can be suppressed more efficiently. This is particularly effective when the length from the bent portion 36 of the existing pipe 30 to the second counterbore 40 is long.

  In each of the above-described embodiments, in order to connect the rehabilitation pipe member 34 following the rehabilitation pipe 32, the sealing tool 10 is extracted from the rehabilitation pipe 32, but the sealing tool 10 is placed in the rehabilitation pipe 32. The rehabilitation pipe member 34 can also be connected while being fastened. For example, as shown in FIGS. 11 and 12, a connecting portion using a coupler (see FIG. 13) at the position of the fluid supply pipe 50 corresponding to the distance from the bent portion 36 of the existing pipe 30 to the first resistance 38. 100 is provided. Further, a connecting portion 102 using a coupler is also provided at a portion where the heating fluid supply pipe 60 and the push rod 52 are connected. Specifically, the end of the fluid supply pipe 50 connected to the fluid supplier 62 is provided with a coupler socket side at the end of the fluid supply pipe 50 connected to the sealing tool 10 and the end of the connecting rod 52. The plug side of the coupler is provided at the end of the heating fluid supply pipe 60.

  And when laying the rehabilitating pipe 32, after inserting the rehabilitating pipe 32 for a predetermined distance and before connecting the subsequent rehabilitating pipe member 34, the coupler-type connecting portions 100 and 102 are separated and sealed. The fluid supply pipe 50 and the push rod 52 connected to the tool 10 are combined into one by a restraining tool 104 such as a wire, rubber or string (see FIG. 11). After connecting the subsequent rehabilitating pipe member 34 to the rehabilitating pipe 32, the fluid supply pipe 50 and the push-in bar 52 connected to the sealing tool 10 are drawn together by hooking the hook onto the restraining tool 104, etc. The supply pipes 50 are connected to each other, and the push rod 52 and the heated fluid supply pipe 60 are connected (see FIG. 12). And it is good to use the method of partially heating the rehabilitation pipe | tube 32 and inserting in the existing pipe | tube 30. FIG.

  In each of the above-described embodiments, every time one rehabilitating pipe member 34 is connected, the rehabilitating pipe 32 is inserted into the existing pipe 30 by a distance corresponding to the length of the rehabilitating pipe member 34. It is not limited. For example, after connecting a plurality of rehabilitation pipe members 34 to the rehabilitation pipe 32, the rehabilitation pipes 32 may be inserted into the existing pipe 30 by a distance corresponding to the length of the plurality of rehabilitation pipe members 34. In this case, the arrangement positions of the first sealing bodies 12 and 80 may be adjusted to be rearward from the bent portion 36 by a distance corresponding to the lengths of the plurality of rehabilitated pipe members 34.

  Further, in each of the above-described embodiments, the rehabilitation pipe 32 is inserted into the existing pipe 30 while the rehabilitation pipe member 34 is connected to form the rehabilitation pipe 32 at the work site. However, the present invention is not limited to this. For example, a long rehabilitation pipe 32 having a length corresponding to the rehabilitation site of the existing pipe 30 may be prepared in advance, and the existing pipe 30 may be rehabilitated using the long rehabilitation pipe 32. Moreover, the rehabilitation pipe | tube 32 which connected the rehabilitation pipe member 34 and was previously formed in required length can also be used.

  For example, when the long rehabilitation pipe 32 is laid using the sealing tool 10 shown in FIG. 5, the rehabilitation pipe is connected to the sealing tool 10 in which the fluid supply pipe 50 and the heating fluid supply pipe 60 are connected in advance. It inserts from the rear end side of 32, and arrange | positions in the position of predetermined distance back from the head of the renovation pipe | tube 32. FIG. Thereafter, the rehabilitation pipe 32 is inserted into the existing pipe 30, and when the leading part of the rehabilitation pipe 32 reaches the bent portion 36 of the existing pipe 30, the rehabilitation pipe 32 is sealed in the rehabilitation pipe 32 using the sealing tool 10. A stop space 48 is formed, and the rehabilitation pipe 32 in a state of being partially softened by heating is inserted into the existing pipe 30 for a predetermined distance. Subsequently, the fluid inside the first sealing body 12 is once drained, the sealing tool 10 is moved backward by a predetermined distance, the sealing space 48 is formed again at a position corresponding to the bent portion 36, and the rehabilitation pipe 32. It is preferable to lay the rehabilitating pipe 32 over the entire length of the rehabilitated part of the existing pipe 30 by repeating the operation of heating the rehabilitation pipe. In this case, if the operation of moving the first sealing body 12 backward is performed quickly, a decrease in the temperature of the sealing space 48 can be suppressed to a small level. Therefore, the rehabilitation pipe 32 can be efficiently heated as compared with heating the entire long rehabilitation pipe 32, and the insertion when inserting the rehabilitation pipe 32 into the existing pipe 30 having the bent portion 36 is possible. Resistance can be suppressed efficiently.

  Further, in each of the above-described embodiments, the first sealing bodies 12 and 80 are expanded by supplying fluid to the inside through the air holes 16, but the present invention is not limited to this. For example, when a gas or liquid whose volume is increased by heating is sealed in the first sealing bodies 12 and 80 and heated by passage of a heating fluid through the passage portions 14 and 92, the first sealing body When the first and second sealing bodies 12 and 80 are expanded and cooled, the first sealing bodies 12 and 80 contract. Similarly, the second sealing body 82 may be expanded and contracted by heating and cooling instead of taking in and out the fluid.

  Further, for example, as the first sealing bodies 12, 80, hexa plugs (for example, manufactured by Rokuhyo Rubber Co., Ltd.) as shown in FIG. 14 can be used. The hexaplug includes a rubber ring 110 having a C-shaped cross section and a flat plate 112 having an inclination angle. When the two flat plates 112 are tightened, the rubber ring 110 is expanded (expanded), and the flat plate 112 is loosened. As a result, the rubber ring 110 contracts (shrinks). When the hexaplug is used, for example, the flat plate 112 is provided with a passage portion 114 having a thread 116 on the outer surface thereof and a passage formed by the inner wall surface 118 serving as a heating fluid passage. Then, the screw groove 56 of the push-in rod 52 as shown in FIG. 6 is screwed into the thread 116 of the passage portion 114 and tightened, whereby the two flat plates 112 are tightened and the rubber ring 110 is expanded. It is good to do so. Similarly, a hexaplug that expands and contracts in conjunction with the expansion and contraction of the first sealing body 80 can be used for the second sealing body 82.

  Further, in each of the above-described embodiments, the heating fluid is caused to flow through the inside 54 of the push-in rod 52, but the present invention is not limited to this. For example, a connection portion for connecting the push rod 52 is separately provided in the first sealing bodies 12 and 80, and the push rod 52 is connected to the connection portion, so that the passage portions 14 and 92 of the sealing tool 10 are connected. The heating fluid supply pipe 60 may be directly connected.

In the laying method of the rehabilitation pipe of one example of this invention, it is a schematic sectional view showing the process of forming the sealing space in a part in the rehabilitation pipe using the sealing tool. It is a schematic sectional drawing which shows the process of inserting predetermined distance in the existing pipe in the state which softened a part of rehabilitation pipe following the process of FIG. It is a schematic sectional drawing which shows the process of removing the sealing tool and connecting the subsequent rehabilitation pipe member following the process of FIG. It is a schematic sectional drawing which shows the process of forming sealing space in the other part in a rehabilitation pipe | tube using a sealing tool following the process of FIG. FIGS. 1A and 1B show an expanded state of a sealing tool used in the laying method of the rehabilitated pipe of FIG. 1, and FIG. It is sectional drawing which shows the pushing rod used for the laying method of the rehabilitation pipe | tube of FIG. FIGS. 1A and 1B show an expanded state of another example of a sealing tool used in the method for laying a rehabilitation pipe in FIG. 1. FIG. 3A is an axial sectional view, and FIG. 1A and 1B show an expanded state of still another example of a sealing tool used in the method of laying a rehabilitated pipe in FIG. 1, (A) is an axial sectional view, and (B) is a radial sectional view. In the laying method of the rehabilitation pipe of other examples of this invention, it is a schematic sectional view showing the process of forming sealing space in a part of rehabilitation pipe using a sealing tool. FIG. 10 is an axial cross-sectional view showing a state where a sealing tool used in the laying method of the rehabilitated pipe of FIG. 9 is expanded. It is a schematic sectional drawing which shows the process of removing a connection part in the state which clamped the sealing tool in the rehabilitation pipe | tube in the laying method of the rehabilitation pipe | tube of further another Example of this invention. It is a schematic sectional drawing which shows the process of connecting the subsequent rehabilitation pipe member and forming the sealed space in a part in the rehabilitation pipe following the process of FIG. It is sectional drawing which shows the connection part (coupler) used for the laying method of the rehabilitation pipe | tube of FIG. The state (A) is an axial sectional view, and (B) is a radial sectional view showing a state where a sealing tool (hexa plug) of still another example used in the laying method of the rehabilitation pipe is expanded.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Sealing tool 12,80 ... 1st sealing body 14,92 ... Passage part 16,86 ... Air hole 30 ... Existing pipe 32 ... Rehabilitation pipe 34 ... Rehabilitation pipe member 36 ... Bending part (insertion resistance part)
48, 98 ... Sealing space 82 ... Second sealing body 84 ... Communication part 90 ... Linked body

Claims (5)

  A laying method of a rehabilitating pipe, wherein the rehabilitating pipe is inserted into an existing pipe while changing the heating position of the rehabilitating pipe by changing the arrangement position of the sealing tool.   The laying method of the rehabilitation pipe according to claim 1, wherein the heating position of the rehabilitation pipe is changed in correspondence with the position of the insertion resistance portion of the existing pipe. A method of laying a rehabilitation pipe that inserts a rehabilitation pipe into an existing pipe,
(A) disposing a sealing tool at a position corresponding to the insertion resistance portion of the existing pipe to form a sealing space in a part of the renovated pipe;
(B) heating the sealed space formed in the step (a) to partially soften the rehabilitation pipe;
(C) inserting the rehabilitation pipe partially softened in the step (b) into the existing pipe for a predetermined distance; and (d) repeating the steps (a) to (c) as necessary to A laying method for a rehabilitated pipe, wherein the rehabilitated pipe is inserted into the existing pipe over the entire length of the rehabilitated portion of the pipe. A sealing tool used to partially heat the rehabilitation pipe when inserting the rehabilitation pipe into an existing pipe,
A first sealing body that can be expanded and contracted, and a passage that is provided in the first sealing body and feeds heated fluid into a sealed space formed in the rehabilitation pipe using the first sealing body The sealing tool provided with a part. A second sealing body provided in front of the first sealing body and capable of expanding and contracting; and a connecting body for connecting the first sealing body and the second sealing body;
The said channel | path part is a sealing tool of Claim 4 which sends a heating fluid into the sealing space formed in the said renovated pipe using the said 1st sealing body and the said 2nd sealing body.

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