JP2011102626A - Method for installing regeneration pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new method for installing a regeneration pipe which reduces friction produced between a bottom portion of an existing pipe and the regeneration pipe during installation of the regeneration pipe. <P>SOLUTION: In the method for installing the regeneration pipe, strip-shaped members are spirally wound, and one edge portion and the other edge portion of the strip-shaped members which are spirally adjacent to each other are sequentially connected to manufacture the regenerated pipe. The regeneration pipe is inserted into the existing pipe while being rotated. A spacer or a rolling element for supporting the rotating regeneration pipe is provided in the vicinity of the bottom portion of the existing pipe. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rehabilitating pipe construction method for rehabilitating existing pipes such as sewage pipes, water pipes, agricultural water pipes, and gas pipes.

  Conventionally, as a method of rehabilitating existing pipes, a belt-like member is supplied to a pipe making machine, spirally wound so as to draw an arc, and one side edge and the other side edge of an adjacent belt-like member are overlapped sequentially. A method has been proposed in which a rehabilitated pipe is produced by joining and inserted into an existing pipe while rotating the rehabilitated pipe (see, for example, Patent Document 1 and Patent Document 2 below).

  That is, in the inventions described in Patent Documents 1 and 2, a pipe making machine is installed in a start side shaft such as a manhole adjacent to an existing pipe, and a rehabilitation pipe is made by the pipe making machine, and the rehabilitation pipe is rotated. It is inserted into the existing pipe so that it is pushed out in sequence.

  However, in this method, as the rehabilitation pipe is inserted deeply into the existing pipe, the rehabilitation pipe hangs down due to its own weight, and the suspended portion contacts the bottom of the existing pipe. When the rotating rehabilitating pipe comes into contact with the existing pipe bottom, friction occurs at the contact portion, and as a result, wear and breakage occur on the outer surface of the rehabilitating pipe.

  When a certain amount of fluid is flowing through the existing pipe, measures can be taken to reduce the generated friction, such as giving buoyancy to the rehabilitation pipe. Such means cannot be adopted.

  Further, when the generated friction increases, the smooth rotation and extrusion of the rehabilitated pipe is hindered, and an excessive burden is placed on the pipe making machine. In some cases, the pipe making operation cannot be continued.

  In order to reduce the friction generated between the rehabilitated pipe and the existing pipe, before inserting the rehabilitated pipe into the existing pipe, the inner peripheral surface of the existing pipe against the T-shaped reinforcing rib existing on the outer peripheral surface of the rehabilitated pipe. A method of locking a rolling element that can make rolling contact with the roller has been developed (for example, see Patent Document 3 below).

JP 2005-528243 Gazette Special table 2008-536027 gazette JP-A-1-219227

  In the method described in Patent Document 3, the rolling elements are locked to the reinforcing ribs of the rehabilitating pipes one after another during the production of the rehabilitating pipes. There is a problem in terms of wide application. That is, since the adjacent ribs having a T-shaped cross section are used for locking, it cannot be applied to a belt-like member having a reinforcing rib other than such a shape.

  The present invention has been developed to solve such technical problems, and is a new rehabilitation pipe that can reduce friction generated between the bottom of the existing pipe and the rehabilitation pipe during the construction of the rehabilitation pipe. The purpose is to provide a construction method.

  The first rehabilitation pipe construction method of the present invention (hereinafter referred to as “the first method of the present invention”) is a method of winding a belt-like member in a spiral shape, In the construction method of a rehabilitation pipe which is inserted into an existing pipe while rotating the rehabilitation pipe by rotating the rehabilitation pipe by sequentially joining the side edges, one or a plurality of rods supporting the rotating rehabilitation pipe The spacer is arranged near the bottom of the existing pipe.

  According to the second rehabilitation pipe construction method of the present invention (hereinafter referred to as “the second method of the present invention”), a belt-shaped member is wound in a spiral shape, one side edge portion of the spiral belt-shaped adjacent members, and the like. In the construction method of the rehabilitation pipe which is inserted into the existing pipe while rotating the rehabilitation pipe by rotating the rehabilitation pipe, the rolling rehabilitation pipe is supported while rotating the rehabilitation pipe. A plurality of rolling elements are arranged near the bottom of the existing pipe.

  Hereinafter, the first method of the present invention and the second method of the present invention will be described in detail.

  In the first method of the present invention, a rehabilitation pipe is formed by winding a belt-like member in a spiral shape, and sequentially joining one side edge and the other side edge of a spiral adjacent belt-like member. This is a method for constructing a rehabilitation pipe that is inserted into an existing pipe while rotating.

  Examples of the strip-shaped member used in the method of constructing the rehabilitation pipe include, for example, a member provided with a reinforcing rib having an I-shaped or T-shaped cross section rising along the length direction of the back surface of the substrate, Although the thing which raised self-supporting intensity | strength by embedding reinforcement members, such as a metal plate, can be mentioned, In the 1st method of this invention, it does not specifically limit about the shape of the said strip | belt-shaped member.

  In addition, there are various means such as an adhesive type, a fusion type, and a fitting type for the means for sequentially joining one side edge and the other side edge of the belt-shaped member. However, in the first method of the present invention, It is not particularly limited.

  In the first method of the present invention, when inserting the rehabilitating pipe into the existing pipe while rotating it, one or a plurality of rod-like spacers for supporting the rotating rehabilitation pipe are arranged near the bottom of the existing pipe.

  That is, in the first method of the present invention, the rehabilitating tube comes into contact with the bottom of the existing tube by supporting the rehabilitating tube rotating with the rod-shaped spacer interposed between the vicinity of the bottom of the existing tube and the rehabilitating tube. Thus, the friction generated when inserting the rehabilitation pipe while rotating it into the existing pipe is reduced.

  In the first method of the present invention, the spacer is not particularly limited as long as the spacer has a physical strength capable of supporting the rehabilitated pipe in the vicinity of the existing pipe bottom. Specific examples of the shape include a square bar shape such as a substantially triangular shape and a substantially quadrangular cross section, and a round bar shape whose cross section is a substantially circular shape. Among them, the round bar shape is preferable because the rotating rehabilitation pipe is excellent in sliding, and is also expected to rotate in response to the rotation of the rehabilitation pipe and to smoothly rotate the rehabilitation pipe.

  The spacer diameter (thickness) is not particularly limited, but if the spacer is too thin, the required strength may not be obtained. On the other hand, if the spacer is too thick, the diameter of the rehabilitated tube may be affected. give. Therefore, in the first method of the present invention, although it depends on the diameter of the existing pipe, it is generally preferable that the diameter (thickness) of the spacer is about 5 to 100 mm.

  In the first method of the present invention, the length of the rod-shaped spacer is not particularly limited. About the length of this spacer, when the rehabilitation pipe is supported in the vicinity of the existing pipe bottom, at least 3 points (preferably, 5 points or more) of the reinforcing ribs present in a spiral form on the outer peripheral surface of the rehabilitation pipe are in contact. If it is set as length, the load given to a reinforcement rib top part can be disperse | distributed effectively.

  In the first method of the present invention, it is preferable to form a plurality of protrusions standing upright in the length direction of the rod-shaped spacer. Specific examples of the protrusion include a rib, a node, and a spiral protrusion. The height of the protrusion is not particularly limited, but if the height of the protrusion is too high, the diameter of the rehabilitation pipe is affected. In the present invention, the height of the protrusion is generally preferably about 1 to 50 mm. Deformed reinforcing bars are commercially available as rod-shaped members having such protrusions (for example, SD295, SD345, SD390, SD490 manufactured by Daiwa Steel Co., Ltd.), and these can also be used.

  The spacer used in the first method of the present invention is difficult to recover after the construction of the rehabilitation pipe. Usually, when constructing the rehabilitated pipe, a backfilling material filling operation is generally performed in which a gap between the existing pipe and the pipe body is filled with a backfilling material such as mortar. In the first method of the present invention, a spacer is used. The backfilling material is filled without performing the recovery operation. Accordingly, the spacer material is preferably selected from metals, plastics, and the like that are unlikely to deteriorate over the long term. Further, since the strength of the backfill material can be expected by the spacer embedded in the backfill material, it is more preferable to select a material having high strength.

  In the first method of the present invention, the spacer is disposed in the vicinity of the existing pipe bottom. This is because the rehabilitation pipe hangs down due to its own weight and almost contacts the bottom of the existing pipe. In the first method of the present invention, “the vicinity of the existing pipe bottom” means a position somewhat along the circumferential direction from the bottom in the existing pipe (in the case of an annular existing pipe, the bottom of the existing pipe is used as the origin, and the surroundings from there. Up to ± 30 degrees along the direction). In the first method of the present invention, a plurality of spacers may be arranged in the vicinity of the existing pipe bottom. When arranging a plurality of spacers in the vicinity of the bottom of the existing pipe, the plurality of spacers may be arranged intermittently at appropriate intervals, even if they are arranged continuously along the pipeline of the existing pipe. May be. In addition, the spacers may be arranged not only in a line along the pipeline but also in a plurality of lines of two or more.

  By the way, during the implementation of the first method of the present invention, the spacer arranged near the bottom of the existing pipe may be pushed away along the circumferential direction of the existing pipe. This is likely to occur when the weight of the rehabilitation pipe is large or when the rotation speed of the rehabilitation pipe is high. If the spacer is pushed away from the vicinity of the existing pipe bottom, the existing pipe bottom and the renovated pipe come into contact with each other, so that a desired friction reduction effect cannot be obtained.

  Therefore, in the first method of the present invention, it is preferable to prevent the spacer from being pushed away by the rehabilitation pipe by using a holder and holding the spacer near the bottom of the existing pipe. When the spacer is in the shape of a round bar, the spacer is preferably held in a state where it can rotate in the circumferential direction, particularly when the spacer is held near the bottom of the existing pipe.

  Subsequently, the second method of the present invention will be described in detail. However, the materials and sizes preferable as rolling elements to be used in place of the strip-shaped member and the spacer, the wording, etc., are the matters described in the first method of the present invention. The description is omitted to avoid repetition.

  In the second method of the present invention, a rehabilitating pipe is formed by winding a belt-like belt-like member in a spiral shape and sequentially joining one side edge and the other side edge of the adjacent spiral belt-like members. The rehabilitation pipe is inserted into the existing pipe while rotating the rehabilitation pipe.

  Then, in the second method of the present invention, when inserting the rehabilitation pipe into the existing pipe while rotating, one or a plurality of rolling elements that roll while supporting the rotating rehabilitation pipe are placed near the bottom of the existing pipe. Deploy.

  That is, in the second method of the present invention, the rolling element is interposed between the existing pipe and the rehabilitation pipe to support the rotating rehabilitation pipe, thereby preventing the rehabilitation pipe from contacting the bottom of the existing pipe. is doing. In the second method of the present invention, since the rolling element rolls upon receiving the rotation of the rehabilitation pipe, the rehabilitation pipe can be smoothly rotated. As a result, friction generated when inserting the rehabilitation pipe while rotating the existing pipe is reduced.

  In the second method of the present invention, the shape of the rolling element is not particularly limited as long as it can roll upon receiving the rotation of the rehabilitation pipe. Specific examples of the shape include a spherical shape, a cylindrical shape, a spindle shape, and a dumbbell shape. The rolling element is a type that supports a reinforcing rib that exists in a spiral shape on the outer peripheral surface of the rehabilitated pipe, and a type that supports the substrate in the belt-shaped member that forms the rehabilitated pipe when arranged near the bottom of the existing pipe. And those that support both the reinforcing ribs and the substrate.

  In the second method of the present invention, the rolling element is disposed in the vicinity of the existing pipe bottom. When arranging the rolling elements in the vicinity of the existing pipe bottom, a plurality of rolling elements may be arranged.

  In the second method of the present invention, the rolling elements arranged in the vicinity of the existing pipe bottom part roll by receiving the rotation of the rehabilitation pipe, so that they usually remain at the positions where they are initially arranged irrespective of the pushing out of the rehabilitation pipe. Therefore, during the construction work of the rehabilitation pipe, the rolling element continues to roll at the position where it was originally arranged. Thereby, a rolling element can be arrange | positioned at a fixed point and a friction can be effectively reduced with a comparatively small number of rolling elements. Moreover, if a rolling element is arrange | positioned in the position which has unevenness, such as a level | step difference, in the existing pipe inner wall, the malfunction of the rehabilitation pipe | tube produced by the said unevenness can also be corrected.

  However, during the execution of the second method of the present invention, the rolling elements arranged near the bottom of the existing pipe may be pushed away along the circumferential direction of the existing pipe.

  Therefore, in the second method of the present invention, it is preferable to use a holder that can hold the rolling element in a rollable manner, and hold the rolling element in the vicinity of the existing pipe bottom so as to be able to roll. That is, by using a holder to hold the rolling element in the vicinity of the existing pipe bottom, the rolling element is prevented from being pushed away by the rehabilitation pipe.

  According to this invention, the friction which arises between the existing pipe bottom part at the time of construction of a renovated pipe and a renovated pipe can be reduced.

FIG. 1 is a perspective view (a) and a cross-sectional view (b) showing an example of a belt-like member used in the first method and the second method of the present invention. FIG. 2 is a cross-sectional view illustrating a process of joining the belt-shaped member of FIG. 1 ((a) molten resin application process, (b) joining process). FIG. 3 is an explanatory view showing a state in which a conventional method for constructing a rehabilitated pipe is carried out using the belt-like member of FIG. 1. FIG. 4 is an explanatory view schematically showing Embodiment 1 according to the first method of the present invention ((a) a side view in which a part of an existing pipe is cut away, and (b) a front sectional view). FIG. 5 is an explanatory view schematically showing an embodiment according to the first method of the present invention ((a) a perspective view in which a part of an existing pipe is cut out and a rehabilitated pipe is shown in a transparent state, and (b) a front sectional view) ). FIG. 6 is an explanatory view schematically showing an embodiment according to the first method of the present invention ((a) a side view in which a part of an existing pipe is cut out and a rehabilitated pipe is shown in a transparent state, and (b) a front sectional view). ). FIG. 7: is explanatory drawing ((a) the side view which cuts off a part of existing pipe, and (b) front sectional drawing) which shows typically Embodiment 1 which concerns on the 2nd method of this invention. FIG. 8: is explanatory drawing ((a) the side view which cuts off a part of existing pipe, and (b) front sectional drawing) which shows typically Embodiment 2 which concerns on the 2nd method of this invention. FIG. 9: is explanatory drawing ((a) the side view which cuts off a part of existing pipe, and (b) front sectional drawing) which shows typically Embodiment 3 which concerns on the 2nd method of this invention. FIG. 10 is an explanatory view schematically showing Embodiment 4 according to the second method of the present invention ((a) a side view in which a part of an existing pipe is cut away, and (b) a front sectional view). FIG. 11: is explanatory drawing ((a) The side view which cuts off a part of existing pipe, and (b) Front sectional drawing) which shows typically Embodiment 5 which concerns on the 2nd method of this invention. FIG. 12 is a cross-sectional view (a) showing another example of a strip-shaped member used in the first method and the second method of the present invention, and a cross-sectional view (b) showing the joining state thereof. FIG. 13: is sectional drawing (a) which shows the further another example of the strip | belt-shaped member used for this invention 1 method and this invention 2 method, and the perspective view (b) which shows the joining state.

  A band-shaped member 100 shown in FIG. 1A is formed by extruding a flexible synthetic resin, such as polyethylene or polypropylene. In this strip member 100, a plurality (three in the embodiment) of I-shaped reinforcing ribs 102 are formed in an upright state along the back surface length direction of the long strip plate-like substrate 101. Yes. A stepped portion 103 is formed on one side edge (hereinafter referred to as one side edge) of the substrate 101, which is stepped down to the back side by the thickness of the substrate 101. This is such that when the belt-like member 100 is wound spirally, the other side edge portion (hereinafter referred to as the other side edge portion) of the substrate 101 in the adjacent belt-like member 100 can be arranged. It is. As shown in the cross-sectional view of FIG. 1B, a reinforcing member 104 such as a steel plate is embedded in each reinforcing rib 102.

  In forming the strip member 100 as a rehabilitation pipe, the belt-like member 100 is spirally wound so that the back surface side of the substrate 101, that is, the side where the reinforcing ribs 102 are erected is the outer peripheral surface. At this time, as shown in FIG. 2A, the molten resin c is applied to one side edge (stepped portion 103) of the following belt-like member 100 out of the two belt-like members 100, 100 adjacent to each other. . Next, as shown in FIG. 2B, one side edge of the subsequent belt-shaped member 100 to which the molten resin c is applied is placed outside (on the other side of the preceding belt-shaped member 100). By overlapping from the outer peripheral surface side), one side edge (stepped portion 103) of the substrate 101 of the subsequent belt-like member 100 is arranged and joined to the other edge of the substrate 101 of the preceding belt-like member 100, A rehabilitation pipe having a predetermined pipe diameter is formed.

  In the known rehabilitation pipe construction method, as shown in FIG. 3, the rehabilitation pipes S formed by spirally winding the belt-like member 100 by the pipe making machine 2 are sequentially pushed out while rotating. Inserted into the existing pipe L. Since the rehabilitation pipe S inserted into the existing pipe L is cantilevered by the pipe making machine 2, as the rehabilitation pipe S is inserted deeply into the existing pipe L, the rehabilitation pipe S hangs down by its own weight, The part that hangs down contacts the bottom of the existing pipe L. When the renewed pipe S that continues to rotate contacts the bottom of the existing pipe L, friction occurs at the contact portion, and as a result, wear or breakage occurs on the outer peripheral surface side of the renewed pipe S.

  In particular, when the band-shaped member 100 provided with the reinforcing ribs 102 having an I-shaped cross section standing upright along the length direction of the substrate 101 as described above is used, the load concentrates on the top of the upstanding reinforcing ribs 102. In some cases, wear and breakage become more prominent, and the reinforcing member 104 may be exposed.

Moreover, when the regenerated pipe S comes into contact with the bottom of the existing pipe L and the friction generated is increased, the revolving pipe S is prevented from being smoothly rotated and pushed out. This makes it impossible to continue the pipe making operation.
<Embodiment according to First Method of Present Invention>
Hereinafter, embodiments according to the first method of the present invention will be described with reference to the drawings. However, the first method of the present invention is not limited to these embodiments.

-Embodiment 1-
FIG. 4 is an explanatory view schematically showing Embodiment 1 according to the first method of the present invention. In this embodiment, a round bar-shaped spacer 1 in which a plurality of ribs 11 are formed on the outer peripheral surface is disposed in the gap with the rehabilitation pipe S near the bottom of the existing pipe L. That is, in this embodiment, when constructing the rehabilitated pipe S, the round bar-shaped spacer 1 arranged in the vicinity of the bottom of the existing pipe L includes the reinforcing ribs 102 existing on the outer peripheral surface of the rehabilitated pipe S. Support at multiple points along.

  Thereby, the renovated pipe S inserted while rotating into the existing pipe L is prevented from coming into contact with the bottom of the existing pipe L, and the friction generated when the renewed pipe S is inserted into the existing pipe L is reduced. .

  Further, when the spacer 1 is rotated by receiving the rotation of the rehabilitation pipe S, the rotation of the rehabilitation pipe S becomes smooth.

  Further, in the present embodiment, the rotation resistance of the spacer 1 is reduced due to the presence of the ribs 11, and the rehabilitation pipe S can be rotated more smoothly.

  In addition, in the present embodiment, the reinforcing ribs 102 existing on the outer peripheral surface of the rehabilitating pipe S are supported at a plurality of points along the arrangement by using the rod-shaped spacer 1, so that the top of the reinforcing rib 102 is provided. Reduces the burden.

-Embodiment 2-
FIG. 5 is an explanatory view schematically showing Embodiment 2 according to the first method of the present invention. In this embodiment, the round bar-shaped spacer 1 is rotatably held in a gap with the rehabilitation pipe S in the vicinity of the bottom of the existing pipe L using a U-shaped holding tool 3. That is, in this embodiment, when constructing the rehabilitation pipe S, the round bar-shaped spacer 1 rotatably held near the bottom of the existing pipe L is provided with the reinforcing rib 102 existing on the outer peripheral surface of the rehabilitation pipe S. Support at multiple points along the line.

  Thereby, the renovated pipe S inserted while rotating into the existing pipe L is prevented from coming into contact with the bottom of the existing pipe L, and the friction generated when the renewed pipe S is inserted into the existing pipe L is reduced. .

  Further, when the spacer 1 is rotated by receiving the rotation of the rehabilitation pipe S, the rotation of the rehabilitation pipe S becomes smooth.

Further, in the present embodiment, the reinforcing ribs 102 existing on the outer peripheral surface of the rehabilitating pipe S are supported at a plurality of points along the arrangement by using the rod-shaped spacer 1, so that the tops of the reinforcing ribs 102 are hooked. The burden is reduced.
In addition, in the present embodiment, the spacer 1 is pushed away from the vicinity of the existing pipe bottom by holding the round bar-shaped spacer 1 on the bottom of the existing pipe L using the holder 3 in a rotatable manner. It is preventing.

-Embodiment 3-
FIG. 6 is an explanatory view schematically showing Embodiment 3 according to the first method of the present invention. In this embodiment, two round bar-shaped spacers 1 are used, and a holder 3 having a shape provided with support ports 31 into which the spacers 1 can be fitted at both ends is used in the vicinity of the bottom of the existing pipe L. It is rotatably held in the gap with the rehabilitation pipe S. That is, in the present embodiment, when constructing the rehabilitation pipe S, the two round bar-shaped spacers 1 arranged in parallel near the bottom of the existing pipe L are reinforced on the outer peripheral surface of the rehabilitation pipe S. The ribs 102 are supported at multiple points along the line.

  Thereby, the renovated pipe S inserted while rotating into the existing pipe L is prevented from coming into contact with the bottom of the existing pipe L, and the friction generated when the renewed pipe S is inserted into the existing pipe L is reduced. .

  Further, when the spacer 1 is rotated by receiving the rotation of the rehabilitation pipe S, the rotation of the rehabilitation pipe S becomes smooth.

  Furthermore, the spacer 1 having a round bar shape is rotatably held at the bottom of the existing pipe L by using the holder 3, thereby preventing the spacer 1 from being pushed away from the vicinity of the existing pipe bottom.

In addition, by arranging two spacers 1 in the vicinity of the bottom of the existing pipe L, the burden on the top of the reinforcing rib 102 is further reduced.
<Embodiment according to Second Method of the Present Invention>
Hereinafter, embodiments according to the second method of the present invention will be described with reference to the drawings. However, the second method of the present invention is not limited to these embodiments.

-Embodiment 1-
FIG. 7 is an explanatory view schematically showing Embodiment 1 according to the second method of the present invention. In this embodiment, the spherical rolling elements 10 are arranged at fixed points at a plurality of positions in the gap with the rehabilitation pipe S near the bottom of the existing pipe L. That is, in the present embodiment, when the rehabilitation pipe S is constructed, a plurality of spherical rolling elements 10 that roll while supporting the substrate 101 in the belt-like member 100 forming the rehabilitation pipe S are provided. Place near the bottom.

  Thereby, the renovated pipe S inserted while rotating into the existing pipe L is prevented from coming into contact with the bottom of the existing pipe L, and the friction generated when the renewed pipe S is inserted into the existing pipe L is reduced. .

  In addition, the rolling element 10 rolls in response to the rotation of the rehabilitation pipe S, whereby the rehabilitation pipe S rotates smoothly.

  Furthermore, since the rolling element 10 is a type that supports the substrate 101 in the strip member 100 that forms the rehabilitation pipe S, the top portion of the reinforcing rib 102 in the strip member 100 is in both the existing pipe L and the rolling element 10. Do not touch. As a result, it is possible to effectively prevent wear and damage to the top of the reinforcing rib 102.

-Embodiment 2-
FIG. 8 is an explanatory view schematically showing Embodiment 2 according to the second method of the present invention. In this embodiment, the cylindrical rolling elements 10 are fixedly arranged at a plurality of positions in the gap with the rehabilitation pipe S near the bottom of the existing pipe L. That is, in the present embodiment, when the rehabilitating pipe S is constructed, a plurality of cylindrical rolling elements 10 that roll while supporting the substrate 101 in the belt-like member 100 forming the rehabilitating pipe S are provided. Place near the bottom.

  Thereby, the renovated pipe S inserted while rotating into the existing pipe L is prevented from coming into contact with the bottom of the existing pipe L, and the friction generated when the renewed pipe S is inserted into the existing pipe L is reduced. .

  In addition, the rolling element 10 rolls in response to the rotation of the rehabilitation pipe S, whereby the rehabilitation pipe S rotates smoothly.

  Furthermore, since the rolling element 10 is a type that supports the substrate 101 in the strip member 100 that forms the rehabilitation pipe S, the top portion of the reinforcing rib 102 in the strip member 100 is in both the existing pipe L and the rolling element 10. Do not touch. As a result, it is possible to effectively prevent wear and damage to the top of the reinforcing rib 102.

  In addition, in this embodiment, since the cylindrical rolling element 10 is used, the contact area between the rolling element 1 and the rehabilitation pipe S is increased, and the rotation of the rehabilitation pipe S is efficiently transmitted to the rolling element 10. . As a result, the rolling element 10 rolls stably.

-Embodiment 3-
FIG. 9 is an explanatory view schematically showing Embodiment 3 according to the second method of the present invention. In this embodiment, the spindle-shaped rolling elements 10 are fixedly arranged at a plurality of positions in the gap with the rehabilitation pipe S in the vicinity of the bottom of the existing pipe L. That is, in this embodiment, when constructing the rehabilitation pipe S, a plurality of spindle-shaped rolling elements 10 that roll while supporting the reinforcing ribs 101 in the belt-like member 100 forming the rehabilitation pipe S are provided. Place near the bottom.

  Thereby, the renovated pipe S inserted while rotating into the existing pipe L is prevented from coming into contact with the bottom of the existing pipe L, and the friction generated when the renewed pipe S is inserted into the existing pipe L is reduced. .

  In addition, the rolling element 10 rolls in response to the rotation of the rehabilitation pipe S, whereby the rehabilitation pipe S rotates smoothly.

  Further, in the present embodiment, the spindle-shaped rolling element 10 is set so as to contact both of the adjacent reinforcing ribs 102. Thus, the burden on the top of the reinforcing rib 102 is dispersed.

-Embodiment 4-
FIG. 10 is an explanatory view schematically showing Embodiment 4 according to the second method of the present invention. In this embodiment, the cylindrical rolling elements 10 are arranged at fixed points at a plurality of positions in the gap with the rehabilitation pipe S at the bottom of the existing pipe L, and three are arranged at each place. That is, in the present embodiment, when the rehabilitating pipe S is constructed, a plurality of cylindrical rolling elements 10 that roll while supporting the substrate 101 in the belt-like member 100 forming the rehabilitating pipe S are provided near the bottom of the existing pipe L. In addition to the arrangement at three locations, three are arranged at each location.

  Thereby, the renovated pipe S inserted while rotating into the existing pipe L is prevented from coming into contact with the bottom of the existing pipe L, and the friction generated when the renewed pipe S is inserted into the existing pipe L is reduced. .

  In addition, the rolling element 10 rolls in response to the rotation of the rehabilitation pipe S, whereby the rehabilitation pipe S rotates smoothly.

  Furthermore, since the rolling element 10 is a type that supports the substrate 101 in the strip member 100 that forms the rehabilitation pipe S, the top portion of the reinforcing rib 102 in the strip member 100 is in both the existing pipe L and the rolling element 10. Do not touch. As a result, it is possible to effectively prevent wear and damage to the top of the reinforcing rib 102.

  In addition, in the present embodiment, by arranging a plurality of rolling elements 10 at each fixed point, the load on each rolling element 10 can be dispersed, and the rolling element 10 is caused by the load of the rehabilitation pipe S. It is prevented from being pushed away from the bottom.

-Embodiment 5-
FIG. 11 is an explanatory view schematically showing Embodiment 5 according to the second method of the present invention. In this embodiment, dumbbell-shaped rolling elements 10 are arranged on the outer peripheral surface at fixed points at a plurality of positions in the gap with the rehabilitation pipe S near the bottom of the existing pipe L. That is, in the present embodiment, when constructing the rehabilitation pipe S, a plurality of spherical rolling elements 10 that roll while supporting the substrate 101 and / or the reinforcing ribs 102 in the belt-like member 100 forming the rehabilitation pipe S are provided. Placed near the bottom of the existing pipe L.

  Thereby, the renovated pipe S inserted while rotating into the existing pipe L is prevented from coming into contact with the bottom of the existing pipe L, and the friction generated when the renewed pipe S is inserted into the existing pipe L is reduced. .

  In addition, the rolling element 10 rolls in response to the rotation of the rehabilitation pipe S, whereby the rehabilitation pipe S rotates smoothly.

  In such dumbbell-shaped rolling elements 10, when the step between the depression at the center and both ends is set to be larger than the height of the reinforcing rib 102 in the belt-like member 100 forming the rehabilitation pipe S, the rehabilitation pipe This is the type that supports the substrate 101 in S. On the other hand, when the level difference between the central depression and both end portions is set to be smaller than the height of the reinforcing rib 102 in the strip-like member 100 forming the rehabilitated pipe S, the reinforcing rib 102 in the rehabilitated pipe S is supported. Moreover, if the level | step difference of the hollow of a center part and both ends is set to the same extent as the height of the reinforcement rib 102 in the strip | belt-shaped member 100 which forms the renovation pipe | tube S, both the strip | belt-shaped member S and the reinforcement rib 102 in the renovation pipe | tube S will be used. It becomes the type to support. Of course, it is good also as a type which makes the rolling element 10 the size which can be fitted between the adjacent reinforcement ribs 102, and supports the board | substrate 101 in the renovated pipe S. FIG.

  By the way, in each of the embodiments according to the first method and the second method of the present invention, the reinforcing rib 102 having an I-shaped cross section is provided along the back surface length direction of the substrate 101 as shown in FIG. However, neither the first method of the present invention nor the second method of the present invention targets only the belt-shaped member 100 having such a shape. For example, FIG. A belt-like member 100 provided with reinforcing ribs 102 having a T-shaped cross section along the back surface length direction of the substrate 101 as shown in FIG. Further, the joining means of the belt-like member 100 is not limited to the case where a molten resin is used. For example, a male mold 105 provided at one side edge of the belt-like member 100 as shown in FIG. Fitting means for fitting into a female mold 106 provided in the above, or fitting means for fitting a separate fitting material 107 into an engaging portion formed between adjacent belt-like members 100 as shown in FIG. 13B. Also good.

DESCRIPTION OF SYMBOLS 1 Spacer 2 Pipe making machine 3 Holder 10 Rolling body 100 Strip member S Renovated pipe L Existing pipe

Claims (7)

  A belt-shaped member is wound in a spiral shape, and a rehabilitation pipe is formed by sequentially joining one side edge and the other side edge of a spiral adjacent band-shaped member, and this rehabilitation pipe is rotated to an existing pipe. In the construction method of the rehabilitation pipe to be inserted, the rehabilitation pipe construction method is characterized in that one or a plurality of rod-shaped spacers supporting the rotating rehabilitation pipe are arranged near the bottom of the existing pipe.   The rehabilitation pipe construction method according to claim 1, wherein the spacer has a round bar shape.   The rehabilitation pipe construction method according to claim 1 or 2, wherein the spacer is formed with a plurality of protrusions standing upright in the length direction.   The rehabilitation pipe construction method according to any one of claims 1 to 3, wherein the spacer is held in the vicinity of an existing pipe bottom using a holder.   A belt-shaped member is wound in a spiral shape, and a rehabilitation pipe is formed by sequentially joining one side edge and the other side edge of a spiral adjacent band-shaped member, and this rehabilitation pipe is rotated to an existing pipe. In the construction method of the rehabilitation pipe to be inserted, one or a plurality of rolling elements that roll while supporting the rotating rehabilitation pipe are arranged in the vicinity of the existing pipe bottom.   The rehabilitation pipe construction method according to claim 5, wherein the rolling element has a spherical shape, a cylindrical shape, a spindle shape, or a dumbbell shape.   The construction method of the rehabilitation pipe | tube of Claim 5 or 6 WHEREIN: The said rolling element is hold | maintained so that it can roll around the existing pipe bottom part using a holder.

Images