JP2017170770A - Pipeline repairing structure and pipeline repairing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipeline repairing structure and a pipeline repairing method which, in a pipeline repairing structure having a regeneration pipe installed inside an existing pipe, can prevent ground water and sand from flowing between the existing pipe and the regeneration pipe.SOLUTION: Provided is a pipeline repairing structure having inside of an existing pipe 100 covered with a regeneration pipe 102. A non-covered region 100a, which is not covered with the repairing pipe 102, is arranged at an end part of the existing pipe 100. The pipeline repairing structure includes a cylindrical elastic member 10 that covers a boundary between the non-covered region 100a and the repairing pipe 102 over both thereof from inside and a cylindrical rigid member 20 that presses the cylindrical elastic member 10 from inside. On an outer peripheral surface of the cylindrical elastic member 10 are formed projecting parts 14-1 and 14-2 that protrude outward in a radial direction, where the protruding parts 14-1 adheres to whole circumference of the non-covered region 100a of the existing pipe and the protruding parts 14-2 adheres to the inside of the regeneration pipe 102.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a pipe repair structure and a pipe repair method such as a sewer pipe.

  In order to repair existing pipes such as sewage pipes, conventionally, repair methods have been performed in which rehabilitated pipes are installed inside existing pipes. As a method for forming the rehabilitated pipe, a cylindrical curable lining material is introduced into an existing pipe in a folded state, and then the curable lining material is cured in a state where the curable lining material is in close contact with the inner surface of the existing pipe (Patent Document 1) and a sheath pipe construction method (Patent Document 2) in which a plurality of ready-made cylindrical pieces are successively introduced into existing pipes are known.

JP 2013-028172 A JP 2011-110856 A

  However, in the above method, after the rehabilitation pipe is installed, the groundwater flowing in from the breakage / crack point of the existing pipe or the earth and sand accompanying it flows through a slight gap between the existing pipe and the rehabilitation pipe. There was a case. If groundwater or earth and sand flows into the pipe, a hollow may be formed in the ground, and damage such as ground depression may occur.

  Accordingly, an object of the present invention is a pipe repair structure in which a rehabilitation pipe is installed inside an existing pipe, and a pipe repair structure that can prevent groundwater and earth and sand from flowing between the existing pipe and the rehabilitation pipe. Another object of the present invention is to provide a pipeline repair method for forming the same.

In order to solve the above problem, the pipeline repair structure according to claim 1 is:
It is a pipeline repair structure where the inner surface of an existing pipe is covered with a rehabilitation pipe,
Of the inner surface of the existing pipe, an end portion of the existing pipe is provided with an uncovered region that is not covered with the rehabilitated pipe over the entire circumference with a predetermined width,
A cylindrical elastic member that covers the boundary between the uncovered region and the rehabilitation pipe from both inside, and a cylinder that presses the cylindrical elastic member from the inside and maintains it in pressure contact with the inner surface of the existing pipe A rigid member,
On the outer peripheral surface of the cylindrical elastic member, there are formed ridges that project radially outward and extend over the entire circumference at least at two locations with a gap in the width direction. One of them is in close contact with the non-covered region of the existing pipe over the entire circumference, and another one of the protrusions is in close contact with the inner surface of the rehabilitated pipe over the entire circumference.

  According to this configuration, even if the groundwater that has been inserted into the pipe line from the ground through the damaged part of the existing pipe flows through the minute gap between the existing pipe and the rehabilitated pipe, The cylindrical elastic member fixed by the cylindrical rigid member is installed, and the two ridges provided on the cylindrical elastic member are installed so as to block the boundary between the existing pipe and the renovated pipe from both sides. Since the water-stopping effect is exhibited, it is possible to prevent further underground water and sediment associated therewith from flowing into the pipeline.

  According to a second aspect of the present invention, in the pipe repair method, the uncovered region has a groove-shaped guide medium formed over the entire inner surface.

  For example, in the case where stress is applied to an existing pipe due to ground fluctuation such as an earthquake, the induction medium induces destruction of the existing pipe at a location where the induction medium is formed. As a result, it is possible to prevent groundwater or earth and sand from flowing into the existing pipe from the outside of the existing pipe due to the destruction of the other parts other than the guide medium of the existing pipe. Therefore, even if there is a ground change such as an earthquake, the water stop function by the existing pipe repair structure of the present invention can be sufficiently maintained.

The pipe repair method according to claim 3 is a pipe repair method in which an inner surface of an existing pipe is covered with a rehabilitation pipe,
A non-covered surface forming step for providing an uncovered region in the inner surface of the existing tube, which is not covered with the rehabilitated tube over the entire circumference, at an end of the existing tube;
A cylindrical elastic member that covers the boundary between the uncovered region and the rehabilitation pipe from both inside, and a cylinder that presses the cylindrical elastic member from the inside and maintains it in pressure contact with the inner surface of the existing pipe A cylindrical member installation step for installing a cylindrical rigid member;
Including
On the outer peripheral surface of the cylindrical elastic member, there are formed ridges that project radially outward and extend over the entire circumference at least at two locations with a gap in the width direction. One of them is in close contact with the non-covered region of the existing pipe over the entire circumference, and another one of the protrusions is in close contact with the inner surface of the rehabilitated pipe over the entire circumference.

  According to the existing pipe repair method of the present invention, the existing pipe repair structure of the present invention described above can be performed by an efficient operation. That is, the existing pipe repair structure of the present invention can be formed simply by pressing the cylindrical elastic member from the inside to the existing pipe inner surface side with the cylindrical rigid member and maintaining the state.

  The existing pipe repairing method according to claim 4 is characterized in that the thickness of the protruding portion is adjustable by forming a plurality of layers.

  Although conditions and environments such as deterioration of existing pipes vary depending on the construction site, according to the above configuration, the preparatory work can be reduced by adopting a configuration that can adjust the height of the protrusion on the site. Therefore, the whole work can be facilitated.

  The existing pipe repairing method according to claim 5, wherein after the uncovered surface forming step and before the cylindrical member installing step, a groove-shaped guide is formed in the uncovered region over the entire circumference of the inner surface. And a step of forming a medium.

  As described in claim 2, by forming a guide medium, it is possible to sufficiently maintain the water stop function by the existing pipe repair structure of the present invention even when there is ground change such as an earthquake. It becomes.

  ADVANTAGE OF THE INVENTION According to this invention, while an old existing pipe is repaired, it can prevent that groundwater and earth and sand flow between an existing pipe and a renovated pipe. Therefore, it is possible to prevent the ground depression due to the inflow of groundwater or earth and sand into the pipeline.

It is a schematic sectional drawing which shows the installation state of a rehabilitation pipe | tube. It is sectional drawing which shows the connection part of an existing pipe and a manhole. It is a perspective view which shows the example of a cylindrical elastic member and a cylindrical rigid member. It is sectional drawing of a cylindrical elastic member. It is an expanded view of a cylindrical rigid member. It is a perspective view which shows an insertion member and its insertion operation | movement. It is a schematic sectional drawing which shows the existing pipe repair structure of this invention. It is a principal part enlarged view of FIG. It is an expanded view which shows the other example of a cylindrical rigid member. It is a perspective view which shows the other example of a cylindrical rigid member. It is explanatory drawing which shows a diameter expansion operation | work.

  Hereinafter, the pipe repair structure and the pipe repair method of the present invention will be described in detail with reference to the drawings. First, each process is demonstrated about the existing pipe repair method of this invention, respectively.

  FIG. 1 is a schematic view showing a state where a rehabilitation pipe is installed inside an existing pipe. As shown in the figure, an existing pipe 100 as a sewer pipe is disposed between two manholes (relay structures) 104-1 and 104-2, and is connected to each other. A rehabilitated tube 102 is installed inside the existing tube 100, and the rehabilitated tube 102 covers the inner surface of the existing tube 100. There is a minute gap between the existing pipe 100 and the rehabilitated pipe 102, and groundwater and earth and sand flowing between the existing pipe 100 and the rehabilitated pipe 102 through cracks (not shown) of the existing pipe 100 It flows in the direction of the manhole 104-1 or 104-2 and flows into the pipeline. The present invention is intended to prevent the inflow of groundwater and earth and sand.

  In the present invention, the rehabilitation pipe may be installed by a conventionally used method. For example, a cylindrical lining material that is cured by light or heat is introduced into an existing pipe in an uncured state, and then the lining material is supplied by supplying compressed air to a sealed space formed by sealing both ends of the lining material. Examples include a lining method for curing the inner surface of the existing pipe while being pressed against the inner surface of the existing pipe, and a lining method for covering the inner surface of the existing pipe with a cylindrical lining material made of a thermoplastic resin.

[Uncoated surface forming process]
Next, the uncoated surface forming step will be described. Of the rehabilitated pipe 102 formed inside the existing pipe 100, the predetermined width at the end of the existing pipe 100 is removed over the entire circumference. As a result, as shown in the enlarged view of FIG. 2, the end portion of the existing pipe 100 in the inner surface of the existing pipe 100 is not covered with the renovated pipe 102 over the entire circumference with a predetermined width. Is formed. Any means may be used for the removal method, and it can be performed by a cutting machine or the like. Although the width | variety of the pipe-axis direction of the non-coating area | region 100a is not specifically limited, For example, it is 100-300 mm.

[Cylindrical member installation process]
Next, a process of installing a cylindrical rigid member and a cylindrical elastic member (collectively referred to as “cylindrical member”) will be described. FIG. 3 is a perspective view showing an example of a cylindrical elastic member and a cylindrical rigid member. The cylindrical elastic member 10 is installed so as to cover the boundary portion 101 between the uncovered region 100a and the rehabilitated tube 102 shown in FIG. 2, and the installation is fixed from the inside by the cylindrical rigid member 20. Is done.

  The cylindrical rigid member 20 is a diameter-expanding member whose diameter can be increased, and the cylindrical elastic member 10 is pressed to the inner surface side of the existing pipe 100 by the diameter-expanding operation of the cylindrical rigid member 20. Specifically, as shown in FIG. 4, the cylindrical base portion 12 that covers the outer peripheral surface 20 a (see FIG. 3) of the cylindrical rigid member 20 and both ends of the base portion 12 in the width direction are shown. It has protrusions 14-1 and 14-2 extending over the entire circumference on the outer peripheral surface of the part. The protruding portions 14-1 and 14-2 protrude outward in the radial direction of the cylindrical elastic member 10.

  In the present embodiment, the two protrusions 14-1 and 14-2 are formed in such a manner that the four small protrusions 14-1a and 14-2a are adjacent to each other. In the installed state, one ridge 14-1 is in close contact with the uncovered region 100a (see FIG. 2) of the existing pipe 100, and the other ridge 14-2 is the inner surface 102a (see FIG. 2) of the rehabilitated pipe 102. It will be in close contact with. Therefore, the height of the protrusion 14-1 and the protrusion 14-2 are different from each other, and the protrusion 14-1 for the existing pipe non-covered surface is the protrusion 14 for the inner surface of the rehabilitated pipe. The height is higher than −2 (that is, the length in the radial direction is longer). The thickness of the base portion 12 is, for example, 2 to 3 mm, the thickness of the protrusion 14-2 is, for example, 2 to 10 mm, and the thickness of the protrusion 14-1 is, for example, the protrusion 14 -2 and the thickness of the rehabilitation pipe 102 are totaled. The length in the width direction of the protrusions 14-1 and 14-2 is, for example, 50 to 100 mm.

  The protrusions 14-1 and 14-2 may have a structure that can be formed into a plurality of layers so that the thickness can be appropriately changed at the construction site. That is, as shown in the figure, the height can be adjusted by installing the height adjusting layer 15 having a bottom surface that fits the surface shape of the protruding portion 14-1 so as to cover the protruding portion 14-1. It may be a simple structure. In the present embodiment, the projecting portions 14-1 and 14-2 are provided at a total of two locations, one at each of both ends in the width direction on the outer peripheral surface of the cylindrical elastic member 10. Then, what is necessary is just to have provided at least 2 places at intervals in the width direction of the cylindrical elastic member, and may provide a protrusion part in another place.

  The protruding portions 14-1 and 14-2 are formed of an elastic member. Examples of the elastic member include rubber and closed cell foam. The rubber may be a normal rubber or a water swelling rubber that swells with water. Examples of the rubber material include SBR and EPDM (JIS K 6353). When water swelling rubber is used, it swells between the cylindrical rigid member 20 and the inner surface of the existing pipe 100 or the inner surface of the rehabilitation pipe 102, and the degree of adhesion is further increased and the water stop effect can be improved. The protrusions 14-1 and 14-2 are not limited to such a configuration, and may have any shape as long as the water stop effect can be exhibited.

  As shown in FIG. 3, the cylindrical rigid member 20 is used by fitting a cylindrical elastic member 10 on the outer periphery thereof. The cylindrical rigid member 20 is a diameter-expanding member that can increase the diameter of the cylindrical elastic member 10. The cylindrical rigid member 20 is expanded in diameter to an appropriate diameter in the existing pipe, that is, the cylindrical elastic member 10. The inner diameter of the cylindrical rigid member 20 is increased until a state where the pressure is pressed to the inner surface side of the existing pipe with an appropriate pressing force is obtained.

  The cylindrical rigid member 20 is formed by curving a single plate member 22, and has a size such that both end portions face each other at a predetermined interval and a gap portion 24 is formed at this portion. The final diameter expansion operation of the cylindrical rigid member 20 is performed by inserting an insertion member 30 (to be described later) into the gap portion 24 in the center direction from the end in the width direction of the cylindrical rigid member 20. Is done by spreading.

  And the maintenance of the diameter-expanded state of the cylindrical rigid member 20 is performed by fixing the insertion member 30 inserted into the gap portion 24 of the cylindrical rigid member 20 at the position as it is. The cylindrical rigid member 20 is stainless steel (SUS316 or SUS314).

  FIG. 5 shows a development view of the cylindrical rigid member 20, that is, the configuration of the plate member 22. As shown in the figure, the plate member 22 is formed of a substantially rectangular member having a predetermined flexibility such as a steel material or a synthetic resin material.

  Bending portions 24-1 and 24-2 are formed at both ends in the width direction of the plate member 22. When the cylindrical rigid member 20 is formed, the bending portions 24-1 and 24-2 are in the radial direction. It is in a state bent toward the outside. The bent portions 24-1 and 24-2 prevent the cylindrical elastic member 10 (see FIG. 3) from being displaced by flowing water or the like flowing in the existing pipe 100, and reinforce the cylindrical rigid member 20. is there. In the present embodiment, one bent portion 24-1 is formed wider than the other bent portion 24-2.

  At both ends in the length direction of the plate member 22, a base end portion 26 and a terminal end portion 28 having predetermined contour shapes, which will be described later, are formed. Further, the bent portions 24-1 and 24-2 do not exist in the vicinity of the base end portion 26 and the terminal end portion 28, and the portions corresponding to the bent portions 24-1 and 24-2 are removed. The flat end portions 31 and 32 are formed, respectively.

  In the base end portion 26 and the terminal end portion 28, inclined end portions 26a and 26b and 28a and 28b are formed on both sides in the width direction of the plate member 22, respectively. The inclined portions 26 a, 26 b, 28 a, 28 b are inclined so as to incline outward in the length direction of the plate member 22 from the respective plate member 22 width direction ends of the base end portion 26 and the terminal end portion 28 toward the center portion. Is formed. Near the central portion of the base end portion 26 and the terminal end portion 28 where the inclined end portions 26a, 26b, 28a, 28b are not formed, central portions 26c, 28c extending substantially parallel to the width direction of the plate member 22 are formed. doing. Due to these shapes of the base end portion 26 and the terminal end portion 28, the base end portion 26 and the terminal end portion 28 have symmetrical shapes. With this configuration, the plate member 22 is curved so that the base end portion 26 and the terminal end portion 28 face each other, and a gap portion 24 (see FIG. 3) is provided between the base end portion 26 and the terminal end portion 28. The cylindrical rigid member 20 is formed.

  The member denoted by reference numeral 25 is the abutting plate member 25, and has a flat, substantially rectangular shape. The plate member 25 reinforces the portion that becomes the gap portion 24 of the cylindrical rigid member 20 and prevents the cylindrical elastic member 10 from protruding from the gap portion 24 toward the inner peripheral side of the cylindrical rigid member 20. It is mounted between the cylindrical rigid member 20 and the cylindrical elastic member 10. The plate member 25 is thinner than or equal to the cylindrical rigid member 20 and can be formed of the same material as the plate member 22.

  FIG. 6 is a perspective view showing a configuration of the insertion member 30 used in the present embodiment, and shows a state in which the insertion member 30 is inserted into the gap portion 24. In order to insert the insertion member 30, in the cylindrical rigid member 20, the flat end portion 31 and the flat end portion 32 described above form an insertion port.

  As shown in the figure, the insertion member 30 is provided with an outer plate portion 38 and an inner plate portion 36 that are substantially flat so as to sandwich the wedge-shaped portion 32 from above and below. The wedge-shaped portion 32 has a length direction in the insertion direction 200, and has contact surfaces 32a and 32b that are in contact with the inclined end portion 26a and the inclined end portion 28a of the cylindrical rigid member 20, respectively. Has on both sides. The contact surfaces 32a and 32b form a narrow angle α that narrows in the insertion direction, and the narrow angle α is substantially equal to an angle β that is formed when the inclined end portion 26a and the inclined end portion 28a face each other. It is formed to become. Furthermore, the length of the contact surfaces 32a and 32b in the insertion direction (arrow 200 direction) is formed to be substantially equal to the inclined end portions 26a and 28a.

  When the insertion member 30 is inserted into the gap 24, the inclined end portion 26a and the inclined end portion 28a of the cylindrical rigid member 20 are inserted between the outer plate portion 38 and the inner plate portion 36 on both sides. In a state where the insertion member 30 is inserted into the gap portion 24, the outer plate portion 38 is positioned on the outer peripheral side of the cylindrical rigid member 20, and the inner plate portion 36 is positioned on the inner peripheral side of the cylindrical rigid member 20. It has become.

  As the insertion member 30 moves through the gap 24 toward the central portion of the cylindrical rigid member 20, the inclined end portions 26a and 28a are pushed by the contact surfaces 32a and 32b, and the width of the gap 24 increases. Move in the direction. Thereby, the diameter of the cylindrical rigid member 20 is expanded.

  Then, when the diameter of the cylindrical rigid member 20 is expanded to an optimum state, the diameter expansion operation by the insertion member 30 is stopped, and the insertion member 30 is fixed at the stop position as it is. The above-mentioned expanded diameter state is maintained. In this state, almost the entire wedge-shaped portion 32 is inserted into the gap portion 24.

  In order to arrange the cylindrical elastic member 10 and the cylindrical rigid member 20, the cylindrical elastic member 10 and the cylindrical rigid member 20 are arranged at desired positions in the existing pipe 100, and the cylindrical rigid member 20 is described above. Thus, it can carry out by expanding a diameter. Thereby, the cylindrical elastic member 10 is pressed to the inner peripheral surface side of the existing pipe 100 by the cylindrical rigid member 20 from the inner side, and is maintained in a pressure contact state.

  FIG. 7 is a view showing a state where the existing pipe repairing method of the present invention is completed, that is, a sectional view showing the existing pipe repairing structure of the present invention, and FIG. 8 is a partial detail view thereof. As shown in the figure, the cylindrical elastic member 10 covers the boundary portion 101 between the uncovered region 100a of the existing tube 100 and the rehabilitated tube 102 from both inside, and one of the protruding portions 14-1 Further, it is in close contact with the non-covering region 100a of the existing pipe 100 all around. Further, the other protrusion 14-2 is in close contact with the inner surface 102a of the rehabilitated tube 102 on the entire circumference. The protruding portions 14-1 and 14-2 are compressed by the diameter expansion operation of the cylindrical rigid member 20.

  As a result, even if the groundwater that has been inserted into the pipe line from the ground through the damaged part of the existing pipe 100 flows through the minute gap between the existing pipe 100 and the rehabilitated pipe 102, Since the protrusions 14-1 and 14-2 are installed so as to block the boundary portion 101 between the existing pipe 100 and the rehabilitation pipe 102 from both sides, the water stop effect is exhibited. Therefore, it is possible to prevent further underground water and accompanying earth and sand from flowing in. By preventing the inflow of groundwater and earth and sand, the generation of cavities in the ground can be prevented, and damage such as ground depression can be prevented.

  As described above, since one bent portion 24-1 of the cylindrical rigid member 20 is formed to be longer in width than the other bent portion 24-2, one bent portion 24-1 is provided with an existing pipe. The other bent portion 24-2 is in contact with the inner peripheral surface 102a of the rehabilitation pipe 102. Thereby, it is possible to prevent the cylindrical elastic member 10 from being displaced due to sewage or foreign matter flowing in the pipe line.

  FIG. 9 is a schematic cross-sectional view showing another embodiment. As shown in the drawing, a groove-shaped guide medium 50 is formed in the uncovered region 100 a of the existing pipe 100. The guide meditation 50 is formed over the entire circumference of the inner surface of the non-covered region 100a of the existing pipe 100.

  For example, when the existing pipe 100 is subjected to stress due to ground fluctuation such as an earthquake, the induction medium 50 induces the destruction of the existing pipe 100 at the location where the induction medium 50 is formed. Thereby, it can prevent that groundwater and earth and sand flow in into the existing pipe 100 from the outer side of the existing pipe 100 by destroying other parts other than the guide meditation 50 of the existing pipe 100. Therefore, even if there is a ground change such as an earthquake, the water stop function by the existing pipe repair structure of the present invention can be sufficiently maintained. The guide medium 50 may be filled with a sealing member such as urethane.

(Example 2 of cylindrical rigid member)
Next, another example of the cylindrical rigid member that can be used in the present invention will be described. FIG. 10 is a development view of the cylindrical rigid member 60. As shown in the figure, the cylindrical rigid member 60 includes a single rectangular plate member 62, and the plate member 62 is formed of a member having a predetermined flexibility such as a steel material or a synthetic resin material.

  A plurality of sets of locking holes 64 a to 64 c formed at intervals in the longitudinal direction of the plate member 62 are provided in the vicinity of one end 62 a of the plate member 62, and in the vicinity of the other end 62 b of the plate member 62. The locking piece 66 is formed by cutting and raising, and the locking piece 66 is formed to protrude inward of the cylindrical rigid member 60.

  The cylindrical rigid member 60 is formed by bending the plate member 62 into a cylindrical shape. Then, when the cylindrical rigid member 60 is expanded in diameter by a later-described expander and then slightly reduced in diameter, the locking piece 66 is selectively engaged with any one set of locking holes 64a to 64c. Thus, the expanded diameter state of the cylindrical rigid member 60 can be maintained.

  Further, bent portions 68-1 and 68-2 are formed at both ends in the width direction of the plate member 62. When the cylindrical rigid member 60 is formed, the bent portions 68 are radially outward. It is in a state of being bent towards. The bent portion 68 prevents the cylindrical elastic member 10 (see FIG. 4) from being displaced due to flowing water or the like flowing in the existing pipeline, and reinforces the cylindrical rigid member 60. It also has a function of facilitating the flow of water and solid matter mixed in water.

  Hereinafter, the operation | work for installing the above-mentioned cylindrical rigid member 60 and the cylindrical elastic member 10 in the existing pipe | tube 100 is demonstrated. FIG. 11 is a schematic view showing a state when the cylindrical rigid member 60 and the cylindrical elastic member 10 are installed in an existing pipe. In order to install the cylindrical rigid member 60 and the cylindrical elastic member 10, first, the cylindrical rigid member 60 and the cylindrical elastic member 10 (similar to those shown in FIG. 3) are mounted on the spreader 50.

  For example, as shown in FIG. 9, the spreader 50 includes a shaft portion 51, and an expansion portion 52 that is fixed to the shaft portion 51 and expands in a balloon shape when supplied with a pressure fluid such as compressed air. The cylindrical rigid member 60 and the cylindrical elastic member 10 are mounted on the spreader 50 in this order in a state where the expansion portion 52 is contracted.

  Next, the expansion portion 52 is expanded by the compressed air supplied from the fluid source arranged on the ground to the nipple 53 via the hose, and the cylindrical elastic member 10 and the cylindrical rigid member 60 are not displaced with respect to the spreader 50. The cylindrical elastic member 10 and the cylindrical rigid member 60 are fixed to the spreader 50 by being pressed against the cylindrical rigid member 60, and maintained in that state.

  Subsequently, the spreader 50 to which the cylindrical elastic member 10 and the cylindrical rigid member 60 are mounted is disposed at the end position of the existing pipe 100, and the expansion portion 52 is further expanded by the compressed air supplied again through the nipple 53. Inflate. The cylindrical rigid member 60 is expanded by the expansion of the expansion portion 52, and is expanded to the extent that the locking piece 66 can be engaged with any one of the locking holes 62a to 62c (see FIG. 10).

  As a result, the cylindrical elastic member 10 is pressed against the inner peripheral surface side of the existing pipe 100 by the cylindrical rigid member 60, and the protrusions 14-1 and 14-2 are elastically deformed. As described above, the cylindrical rigid member 60 and the cylindrical elastic member 10 are installed in the existing pipe 100. The repair structure of the existing pipe installed in this way can obtain the same effects as those shown in FIG.

  The present invention is not limited to the configuration of the above embodiment, and various modifications are possible within the scope of the gist of the invention. The present invention can be applied to existing pipes of any size. For example, it can be suitably used for an existing pipe having a nominal diameter of 200 to 800 mm, for example, a buried pipe, particularly a sewer pipe.

DESCRIPTION OF SYMBOLS 10 Cylindrical elastic member 12 Base part 14 Projection part 14-1a, 14-2a Small projection part 20 Cylindrical rigid member 22 Plate member 24 Gap part 24-1, 24-2 Bending part 30 Insertion member 60 Cylindrical form Rigid member 62a, 62b, 62c Locking hole 64 Locking piece 100 Existing pipe 100a Uncovered area 101 Boundary part 102 Rehabilitated pipe 104-1, 104-2 Manhole

Claims (5)

It is a pipeline repair structure where the inner surface of an existing pipe is covered with a rehabilitation pipe,
Of the inner surface of the existing pipe, an end portion of the existing pipe is provided with an uncovered region that is not covered with the rehabilitated pipe over the entire circumference with a predetermined width,
A cylindrical elastic member that covers the boundary between the uncovered region and the rehabilitation pipe from both inside, and a cylinder that presses the cylindrical elastic member from the inside and maintains it in pressure contact with the inner surface of the existing pipe A rigid member,
On the outer peripheral surface of the cylindrical elastic member, there are formed ridges that project radially outward and extend over the entire circumference at least at two locations with a gap in the width direction. 1 is closely attached to the non-covered region of the existing pipe over the entire circumference, and another one of the protrusions is closely attached to the inner surface of the rehabilitated pipe over the entire circumference. .   The pipe repair structure according to claim 1, wherein the uncovered region has a groove-shaped guide medium formed over the entire circumference of the inner surface. A pipe repair method in which the inner surface of an existing pipe is covered with a retread pipe,
A non-covered surface forming step for providing an uncovered region in the inner surface of the existing tube, which is not covered with the rehabilitated tube over the entire circumference, at an end of the existing tube;
A cylindrical elastic member that covers the boundary between the uncovered region and the rehabilitation pipe from both inside, and a cylinder that presses the cylindrical elastic member from the inside and maintains it in pressure contact with the inner surface of the existing pipe A cylindrical member installation step for installing a cylindrical rigid member;
Including
On the outer peripheral surface of the cylindrical elastic member, there are formed ridges that project radially outward and extend over the entire circumference at least at two locations with a gap in the width direction. One of them is in close contact with the non-covered area of the existing pipe over the entire circumference, and another one of the protrusions is in close contact with the inner surface of the rehabilitated pipe over the entire circumference. .   The method according to claim 3, wherein the thickness of the protrusion is adjustable by forming a plurality of layers. After the uncoated surface forming step and before the cylindrical member installing step,
5. The method according to claim 3, further comprising a step of forming a groove-shaped guide medium in the uncovered region over the entire circumference of the inner surface.

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