Rehabilitation pipe slope adjustment device and existing pipe rehabilitation method

Abstract

To facilitate design and manufacturing of a rehabilitation pipe slope adjustment device by providing the rehabilitation pipe slope adjustment device capable of standardizing parts dimensions and structures regardless of the position of a pipe axis direction or the like, when installing a rehabilitation pipe at a slope in an existing pipe.SOLUTION: A plurality of slope adjustment members 11 of a rehabilitation pipe slope adjustment device 10 is installed at intervals in a pipe axial direction inside an existing pipe 1. Each slope adjustment member 11 is bridged in a bridging direction along a pipe width of the existing pipe 1, and abutment parts 21 at both ends in the bridging direction are abutted against an inner wall 1a of the existing pipe 1 by adjusting an opening width W using expansion / contraction means 14. The rehabilitation pipe 3 is placed on the slope adjustment members 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rehabilitation pipe gradient adjustment device that adjusts the gradient of a rehabilitation pipe, and a method for rehabilitating an existing pipe using the rehabilitation pipe, and in particular to a rehabilitation pipe gradient adjustment device for installing a rehabilitation pipe in an existing pipe with a gradient, and a method for rehabilitating an existing pipe using the rehabilitation pipe gradient adjustment device. [Background technology]

[0002] A method for rehabilitating an existing pipe such as an aged sewer pipe by installing a rehabilitation pipe inside the existing pipe is known (see Patent Document 1, etc.). This type of rehabilitation pipe needs to ensure flow performance.

[0003] For example, in Patent Document 1, prior to the installation of the rehabilitating pipe, multiple plate- or block-shaped platforms are installed at intervals in the axial direction of the bottom of the existing pipe. The heights of these platforms are different from one another, with those on the downstream side being lower. By placing the rehabilitating pipe on these platforms, a specified gradient is given to the rehabilitating pipe.

[0004] In Patent Document 2, multiple short guide rails are installed at intervals in the axial direction of the bottom of the existing pipe. Each guide rail is supported by multiple legs with its longitudinal direction facing the axial direction of the pipe. The height and inclination angle of the guide rails are adjusted by setting the height of each leg. The rehabilitating pipe is installed on these guide rails, giving the rehabilitating pipe a specified gradient.

[0005] In Patent Document 3, a number of height forming legs arranged in the circumferential direction of the pipe and a unit-shaped spacer made of a steel plate connecting these height forming legs are installed at intervals in the pipe axial direction of the bottom of the existing pipe. The rehabilitated pipe is placed on these spacers. Each height forming leg is composed of one bar material or multiple bars stacked one on top of the other extending in the pipe axial direction. The gradient of the rehabilitated pipe is adjusted by adjusting the diameter of each bar material or the number of bars. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 01-083739 [Patent Document 2] JP 2014-196799 A [Patent Document 3] Patent No. 6679800 Summary of the Invention [Problem to be solved by the invention]

[0007] In the gradient adjustment devices for rehabilitating pipes in the above-mentioned Patent Documents 1 to 3, it is necessary to prepare multiple gradient adjustment members with different dimensions and structures according to the position in the axial direction of the existing pipe. That is, in Patent Document 1, multiple platforms with different heights are required as gradient adjustment members. In Patent Document 2, multiple guide rails with different leg heights are required as gradient adjustment members. In Patent Document 3, multiple height forming legs with different diameters or numbers of rods are required as gradient adjustment members. For this reason, gradient adjustment members must be designed and manufactured one by one, which causes a problem of complicated design and manufacturing and high costs. If the condition of the existing pipe is different or has changed after manufacturing, it is necessary to remanufacture. In consideration of the above circumstances, the present invention aims to facilitate the design and manufacture of a rehabilitation pipe gradient adjustment device by providing a rehabilitation pipe gradient adjustment device that enables component dimensions and structure to be standardized regardless of the axial position of the pipe when installing a rehabilitation pipe with a gradient inside an existing pipe. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a rehabilitating pipe gradient adjustment device that is installed in an existing pipe and adjusts the gradient of a rehabilitating pipe that rehabilitates the existing pipe, The present invention provides a gradient adjustment member that can be bridging in a bridging direction along the width of the existing pipe, and the gradient adjustment member is Abutting portions provided at both ends in the laying direction and abutted against the inner wall of the existing pipe; An expansion / contraction means for expanding / contracting an opening width between the abutting portions at both ends along the bridging direction; The rehabilitating pipe is placed on the gradient adjustment member.

[0009] When rehabilitating an existing pipe, a rehabilitation pipe gradient adjustment device is installed inside the existing pipe prior to installing the rehabilitation pipe. More specifically, the gradient adjustment member of the rehabilitation pipe gradient adjustment device is spanned in a span direction along the width of the existing pipe. At this time, the installation height of the gradient adjustment member is adjusted according to the position in the pipe axial direction, and the opening width is expanded or reduced by the expansion / contraction means. This allows the gradient adjustment member to be spanned and fixed in the pipe width direction regardless of differences in the pipe width of the existing pipe according to the installation height of the gradient adjustment member. Therefore, there is no need to change the component dimensions or structure of the gradient adjustment member for each installation position in the pipe axial direction. Thereafter, the rehabilitating pipe is placed on the gradient adjusting member.

[0010] In a first preferred form of the present invention, the gradient adjustment member includes a main body portion having a receiving portion for receiving the rehabilitation pipe, and a pair of arms supported on both sides of the main body portion in the laying direction via the expansion / contraction means so as to be able to move forward and backward in the laying direction, and the abutment portion is provided at the end of each arm member. This allows the opening width to be variably adjusted by moving the arm member back and forth in the span direction, and the gradient adjustment member can be spanned and fixed on both sides of the existing pipe regardless of the installation height.

[0011] In a second preferred embodiment of the present invention, the gradient adjustment member has a pair of bridging members that cross each other at a middle portion, The abutment portions are provided at both ends of each bridging member, The expansion / contraction means includes a connecting shaft that connects the bridging members to each other at the intermediate portions in such a manner that the angle between the bridging members is adjustable. This makes it possible to variably adjust the opening width by adjusting the crossing angle of the pair of bridging members, and the gradient adjustment member can be fixed across both sides of the existing pipe regardless of the installation height.

[0012] Preferably, the gradient adjustment members are provided at a plurality of positions spaced apart in the pipe axial direction within the existing pipe, and the opening widths of the gradient adjustment members at two different positions are different from each other. Even if the component dimensions and structures of these gradient adjustment members are the same, by varying the opening width, the gradient adjustment members can be fixed across both sides of the existing pipe regardless of the difference in installation height. By having the rehabilitating pipe supported by these gradient adjustment members, the rehabilitating pipe can be installed with a gradient relative to the existing pipe.

[0013] The method of the present invention is a rehabilitation method for rehabilitating an existing pipe by installing a rehabilitation pipe inside the existing pipe, comprising the steps of: A plurality of gradient adjustment members are arranged in the existing pipe at intervals in a pipe axial direction, At least a part of the gradient adjustment members among the plurality of members is laid in a laying direction along the pipe width of the existing pipe, By expanding and reducing the opening width along the laying direction between the abutting portions at both ends of each gradient adjustment member in the laying direction, the abutting portions at both ends abut against the inner wall of the existing pipe, The rehabilitating pipe is supported by being placed on the plurality of gradient adjusting members. This allows the rehabilitation pipe to be installed with a slope relative to the existing pipe by adjusting the installation height of each slope adjustment member. By adjusting the opening width, the slope adjustment members can be fixed across both sides of the existing pipe regardless of the difference in installation height. The gradient adjustment members other than the part among the plurality of gradient adjustment members may simply be placed on the bottom of the existing pipe. Effect of the Invention

[0014] According to the present invention, the component dimensions and structure of the gradient adjustment members in a rehabilitation pipe gradient adjustment device for installing a rehabilitation pipe with a gradient inside an existing pipe can be standardized regardless of the position in the pipe axial direction, etc., thereby simplifying the design and manufacture of the rehabilitation pipe gradient adjustment device. [Brief description of the drawings]

[0015] [Figure 1]FIG. 1 is a side cross-sectional view of an existing pipe being rehabilitated by a rehabilitation method using a rehabilitation pipe gradient adjustment device according to a first embodiment of the present invention. [Diagram 2] Fig. 2(a) is a front cross-sectional view of the existing pipe being rehabilitated taken along line IIa-IIa in Fig. 1. Fig. 2(b) is a front cross-sectional view of the existing pipe being rehabilitated taken along line IIb-IIb in Fig. 1. Fig. 2(c) is a front cross-sectional view of the existing pipe being rehabilitated taken along line IIc-IIc in Fig. 1. [Diagram 3] Fig. 3(a) is a plan view showing each gradient adjustment member of the rehabilitation pipe gradient adjustment device in a state where the open width is minimum, Fig. 3(b) is a plan view showing the gradient adjustment member in a state where the open width is large, and Fig. 3(c) is a cross-sectional view of the gradient adjustment member at the position of line IIIc-IIIc in Fig. 3(b). [Figure 4] FIG. 4 is a side cross-sectional view of an existing pipe being rehabilitated by a rehabilitation method using a rehabilitation pipe gradient adjustment device according to a second embodiment of the present invention. [Diagram 5] FIG. 5 is a plan view taken along line VV in FIG. 4 of an existing pipe after the installation of a rehabilitating pipe gradient adjustment device according to the second embodiment and before the installation of a rehabilitating pipe. [Figure 6] Fig. 6(a) is a front cross-sectional view of the existing pipe being rehabilitated taken along line VIa-VIa in Fig. 4. Fig. 6(b) is a front cross-sectional view of the existing pipe being rehabilitated taken along line VIb-VIb in Fig. 4. [Figure 7] FIG. 7 is an exploded perspective view of each gradient adjusting member of the rehabilitating pipe gradient adjusting device according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 3)> As shown in Fig. 1, a rehabilitation pipe 3 is installed inside an aged existing pipe 1 to rehabilitate the existing pipe 1. The existing pipe 1 to be rehabilitated is a sewerage pipe buried underground, but is not limited to this and may be a water supply pipe, an agricultural water pipe, a gas pipe, a hydroelectric power generation water pipe, a tunnel, etc. As shown in Fig. 2, the cross-sectional shape of the existing pipe 1 is preferably circular.

[0017] The rehabilitating pipe 3 is a circular pipe with a diameter slightly smaller than that of the existing pipe 1. The rehabilitating pipe 3 may be a helical pipe made by winding a long strip-shaped member made of synthetic resin in a helical shape, or a shape-memory resin tube. The method for manufacturing the rehabilitating pipe 3 made of a helical pipe may be a push-type in which a push-type pipe manufacturing machine installed at the starting end of the existing pipe 1 pushes the pipe into the existing pipe 1 while manufacturing the pipe, or a towing type in which the manufactured rehabilitating pipe is pulled by a wire toward the destination end of the existing pipe.

[0018] As shown in FIG. 1, the rehabilitation pipe 3 is provided with a predetermined gradient in order to ensure flow performance. 1, the slope of the rehabilitating pipe 3 is exaggerated. The existing pipe 1 may also have a slope, and the slope of the rehabilitating pipe 3 is larger than the slope of the existing pipe 1.

[0019] As shown in Fig. 1 and Fig. 2, a rehabilitating pipe gradient adjustment device 10 for adjusting the gradient of a rehabilitating pipe 3 is provided at the pipe bottom 1b or the lower half of the existing pipe 1. The rehabilitating pipe gradient adjustment device 10 is provided with a plurality of gradient adjustment members 11. In Fig. 1, the number of gradient adjustment members 11 is three, but the number is not limited to three, and may be two, four or more. The plurality of gradient adjustment members 11 are arranged apart from each other in the pipe axis direction of the existing pipe 1. In other words, the gradient adjustment members 11 are provided at each of a plurality of positions apart in the pipe axis direction in the existing pipe 1. The gradient adjustment members 11 are arranged at a higher position on the upstream side of the flow direction (upper side in Fig. 1). The rehabilitating pipe 3 is tilted upward toward the upstream side of the flow direction (upper side in Fig. 1) and is placed and supported on the gradient adjustment members 11.

[0020] The multiple gradient adjustment members 11 of the rehabilitating pipe gradient adjustment device 10 have the same component dimensions and structure and are configured identically to one another. As shown in Fig. 3, each gradient adjustment member 11 includes a main body 12 and a pair of arms 20. As shown in Fig. 3(c), the main body 12 is formed in a flattened C-shaped cross section and extends in a longitudinal direction (left-right direction in Fig. 3(a)) perpendicular to the plane of Fig. 3(c). As shown in Fig. 3(a), a receiving portion 13 that receives the rehabilitating pipe 3 is provided in the center of the upper surface of the main body 12. Although detailed illustration is omitted, the upper surface of the receiving portion 13 has a partially cylindrical concave shape that matches the outer circumferential surface of the rehabilitating pipe 3.

[0021] As shown in FIG. 3(c), slide guides 14 having, for example, a U-shaped cross section are provided on both edges of the main body 12 in the short side direction (the left-right direction in FIG. 3(c)).

[0022] As shown in FIG. 3(a), a pair of arms 20 are provided on both sides of the receiving portion 13 in the main body 12 in the longitudinal direction (left-right direction in FIG. 3(a)). Each arm 20 is formed in a flat plate shape, but is not limited to this, and may be a columnar or cylindrical shape. As shown in FIG. 3(c), both edges of the arm 20 in the short direction (left-right direction in FIG. 3(c)) are engaged with the slide guide 14 so as to be slidable in the longitudinal direction (direction perpendicular to the paper surface in FIG. 3(c)). As a result, the arm 20 is supported by the main body 20 via the slide guide 14 so as to be able to advance and retreat in the longitudinal direction (left-right direction in FIG. 3(a)). As shown in FIG. 3(a), the arm 20 is retracted into the main body 12 when retreating. As shown in FIG. 3(b), the arm 20 is protruded outward in the longitudinal direction (left-right direction in FIG. 3(b)) from the main body 12 when advancing.

[0023] As shown in Figures 3(a) and 3(b), the outer longitudinal end of each arm 20 constitutes an abutment portion 21. Thus, an abutment portion 21 is provided at each of the longitudinal ends of the gradient adjustment member 11. The distance along the longitudinal direction between the abutment portions 21 at both ends constitutes the opening width W of the gradient adjustment member 11. The opening width W is increased or decreased as the arm 20 advances or retreats along the slide guide 14. The slide guide 14 constitutes an expansion / contraction means for expanding or contracting the opening width W. In addition, when the arm member 20 is retracted into the main body portion 12, both ends in the longitudinal direction of the main body portion 12 may form the abutment portions 15 (FIG. 2(b)).

[0024] 1 and 2, the gradient adjustment member 11 can be laid in a direction (laying direction) along the pipe width perpendicular to the pipe axis of the existing pipe 1, and can be placed on the pipe bottom 1b of the existing pipe 1. The multiple gradient adjustment members 11 spaced apart in the pipe axis direction of the existing pipe 1 not only differ from each other in placement height, but also differ from each other in longitudinal direction orientation or opening width W.

[0025] More specifically, as shown in Fig. 1 and Fig. 2(a)-(b), the longitudinal direction of the gradient adjustment members 11A, 11B on the upstream side (right side in Fig. 1) from the downstream end in the flow direction (left end in Fig. 1) is oriented in the pipe width direction of the existing pipe 1. The arms 20 of the gradient adjustment members 11A, 11B protrude from the main body 12, and the abutment portions 21 at both ends abut against the inner walls 1a on both sides of the existing pipe 1, respectively. As a result, the gradient adjustment members 11A, 11B are spanned in the span direction along the pipe width of the existing pipe 1. The middle portion including the main body 12 of the gradient adjustment members 11A, 11B is spaced upward from the pipe bottom 1b.

[0026] Each gradient adjustment member 11A, 11B has the protruding amount of the arm member 20, and therefore the opening width W, adjusted to match the pipe width of the existing pipe 1 at the installation height. Of the two gradient adjustment members 11 adjacent to each other in the pipe axial direction, the gradient adjustment member 11A (Figure 2(a)) on the upstream side in the flow direction has a higher installation height than the gradient adjustment member 11B (Figure 2(b)) on the downstream side in the flow direction, and therefore has a larger protrusion amount of the arm member 20 and a larger opening width W. Preferably, the opening width W is not reduced by the weight of the gradient adjustment member 11 in the laid state or by the vertical load from the rehabilitation pipe 3.

[0027] 1 and 2(c), the gradient adjustment member 11C at the downstream end in the flow direction (the left end in FIG. 1) is placed on the pipe bottom 1b with its longitudinal direction aligned with the pipe axis direction of the existing pipe 1. The arm 20 of the gradient adjustment member 11C is retracted and recessed into the main body 12. Note that the arm 20 of the gradient adjustment member 11C may protrude from the main body 12.

[0028] The existing pipe 1 is rehabilitated as follows. Prior to the installation of the rehabilitating pipe 3, a rehabilitating pipe gradient adjustment device 10 is installed in the existing pipe 1. That is, a plurality of gradient adjustment members 11 are arranged at intervals from one another in the axial direction of the existing pipe 1.

[0029] As shown in Fig. 2(a) and Fig. 2(b), at least some of the gradient adjustment members 11A and 11B are laid across the existing pipe 1 in the pipe width direction (laying direction). At this time, the arm member 20 is advanced and retreated to adjust the opening width W according to the design gradient of the rehabilitation pipe 3 and the installation position in the pipe axis direction. Specifically, the arm member 20 is protruded farther to increase the opening width W of the gradient adjustment member 11A that is installed further upstream in the downstream direction (right side in Fig. 1). As a result, the abutment parts 21 at both ends of the gradient adjustment member 11A abut against the inner walls 1a on both sides of the existing pipe 1 at a higher position, the more upstream the gradient adjustment member 11A is. Therefore, the gradient adjustment member 11A on the more upstream side in the downstream direction can be placed higher than the gradient adjustment member 11B on the more downstream side in the downstream direction. As shown in Figure 2(b), when the installation height is low, the entire arm member 20 can be retracted into the main body portion 12 so that both longitudinal ends (abutment portions 15) of the main body portion 12 abut against the inner walls 1a on both sides of the existing pipe 1. In this manner, by adjusting the opening width W, the gradient adjustment member 11 can be bridged between the inner walls 1a on both sides of the existing pipe 1 regardless of the difference in pipe width at the installation height.

[0030] If the inner wall 1a of the existing pipe 1 has deteriorated to the point where it has become brittle or has dents or steps, the inner wall 1a may be covered with a protective cover (not shown) made of an iron plate or the like, and the abutting portion 21 may be abutted against the inner wall 1a through the protective cover.

[0031] The gradient adjusting member 11C at the downstream end in the flow direction is placed on the pipe bottom 1b. Note that the gradient adjusting member 11C may be omitted.

[0032] Next, the rehabilitating pipe 3 is introduced into the existing pipe 1 and placed and supported on the multiple gradient adjustment members 11. This allows the rehabilitating pipe 3 to be installed with a gradient within the existing pipe 1. By adjusting the installation height of each gradient adjustment member 11, the gradient of the rehabilitating pipe 3 can be adjusted to the design gradient. Thereafter, anti-floating work (not shown) is applied to the rehabilitated pipe 3, and then the pipe gap 2 between the inner surface of the existing pipe 1 and the outer surface of the rehabilitated pipe 3 is filled with backfilling material (not shown).

[0033] According to the rehabilitation pipe gradient adjustment device 10, even if the installation height of the gradient adjustment member 11 varies depending on the position in the pipe axial direction, there is no need to change the component dimensions or structure of the gradient adjustment member 11 for each installation position, and the component dimensions and structure of multiple gradient adjustment members 11 can be standardized. Therefore, the design and manufacture of the gradient adjustment member 11 can be simplified, and costs can be reduced. Furthermore, even if the condition of the existing pipe 1 differs or changes during the rehabilitation construction stage after the gradient adjustment member 11 is manufactured, there is no need to remanufacture the gradient adjustment member 11.

[0034] Next, another embodiment of the present invention will be described. In the following embodiment, the same reference numerals are given to the same components as those in the above-described embodiment, and the description thereof will be omitted. <Second embodiment (FIGS. 4 to 7)> As shown in Figs. 4 to 6, in the rehabilitation pipe gradient adjustment device 10B according to the second embodiment of the present invention, each gradient adjustment member 30 includes a pair of bridging members 31 and a connecting shaft 33. As shown in Fig. 7, each bridging member 31 is formed in a rod shape or a long plate shape with an obtuse-angle crank shape in which an intermediate portion 31c is bent. The arms 31a on both sides of the intermediate portion 31c of the bridging member 31 extend from the intermediate portion 31c to opposite sides. The angle between each arm 31a and the intermediate portion 31c is an obtuse angle. The tip end of each arm 31a (i.e., both ends of the bridging member 31) constitutes an abutment portion 32. Therefore, the gradient adjustment member 30 has four abutment portions 32.

[0035] As shown in FIG. 5, the pair of bridging members 31 of the gradient adjusting member 30 cross each other in an X-shape at the middle portion 31c. As shown in Fig. 7, a recess 31d is formed in the middle portion 31c of each bridging member 31. Therefore, the middle portion 31c is thinner than the arm portion 31a. The recess 31d is formed on the opposite surfaces of the pair of bridging members 31. The middle portion 31c of one bridging member 31 is fitted into the recess 31d of the other bridging member 31, so that the middle portions 31c of the pair of bridging members 31 are overlapped with each other. The middle portion 31c constitutes a receiving portion that receives the rehabilitation pipe 3 from below.

[0036] As shown in Fig. 5, the middle parts 31c of these bridging members 31 are connected to each other by a connecting shaft 33 (expansion / contraction means) so that the angle can be adjusted (rotated). The axis of the connecting shaft 33 is perpendicular to the bridging members 31. By adjusting the angle between the pair of bridging members 31, the opening width W between the abutment parts 32 at both ends in the bridging direction along the pipe width of the existing pipe 1 can be expanded or contracted.

[0037] As shown in Figures 4 to 6, multiple gradient adjustment members 30 of the rehabilitation pipe gradient adjustment device 10B are arranged at intervals in the pipe axial direction of the existing pipe 1. The gradient adjustment members 30 located further upstream in the downstream direction (right side in Figure 5) are adjusted so that the angle between a pair of bridging members 31 becomes larger. Therefore, the further upstream the gradient adjustment members 30 are located, the larger the opening width W between the abutment portions 32 at both ends in the bridging direction along the pipe width of the existing pipe 1 becomes.

[0038] As a result, the gradient adjustment members 30 placed further upstream in the downstream direction (to the right in FIG. 5) are placed at a higher position within the existing pipe 1, and the abutment portions 32 of each gradient adjustment member 30 abut against the inner walls 1a on both sides in the pipe width direction of the existing pipe 1. As a result, the gradient adjustment members 30 are bridged in the pipe width direction of the existing pipe 1. Preferably, the opening width W is not reduced by the weight of the gradient adjustment members 30 in the bridged state or by the vertical load from the rehabilitating pipe 3.

[0039] If the inner wall 1a of the existing pipe 1 has deteriorated to the point where it has become brittle or has dents or steps, a protective cover made of an iron plate or the like (not shown) may be interposed between the inner wall 1a and the abutment portion 32.

[0040] The gradient adjusting member 30 at the downstream end in the flow direction (the left end in FIG. 5) is placed on the pipe bottom 1b of the existing pipe 1 with a pair of bridging members 31 oriented in the pipe axial direction in parallel to each other.

[0041] The rehabilitating pipe 3 is placed on these gradient adjusting members 30, so that a predetermined gradient is imparted to the rehabilitating pipe 3. In the rehabilitating pipe gradient adjustment device 10B of the second embodiment, the part dimensions and structure of the multiple gradient adjustment members 30 can be shared regardless of the arrangement position in the pipe axial direction. Therefore, the design and manufacture of the rehabilitating pipe gradient adjustment device 10B can be simplified.

[0042] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the expansion / contraction means of the gradient adjustment member may have a screw mechanism including a male screw and a female screw. As a modified embodiment of the first embodiment (FIGS. 1 to 3), instead of the sliding type expansion / contraction means 14, the arm member may be screwed to the main body 12 so as to move forward and backward in the laying direction. One or more gradient adjustment members 11 and one or more gradient adjustment members 30 may be used in combination. [Industrial Applicability]

[0043] The present invention is applicable to, for example, rehabilitation work for deteriorated sewer pipes. [Explanation of symbols]

[0044] 1 Existing pipes 1a Inner walls on both sides 1b Bottom of tube 2. Pipe clearance 3 Rehabilitation pipe 10. Rehabilitation pipe gradient adjustment device 10B Rehabilitation pipe gradient adjustment device 11 Gradient adjustment member 12 Main body 13 Receiving part 14 Slide guide (expansion / contraction means) 15 Stopping part 20 arm material 21 Stopping part 30 Gradient adjustment member 31 Bridge material 31a Arm 31c Middle part (receiving part) 31d Recess 32 Stopping part 33 Connecting shaft (expansion / contraction means) W Opening width

Claims

1. A rehabilitating pipe gradient adjustment device that is installed in an existing pipe and adjusts the gradient of a rehabilitating pipe that rehabilitates the existing pipe, The present invention provides a gradient adjustment member that can be bridging in a bridging direction along the width of the existing pipe, and the gradient adjustment member is Abutting portions provided at both ends in the bridging direction and abutted against the inner wall of the existing pipe; An expansion / contraction means for expanding / contracting an opening width between the abutting portions at both ends along the bridging direction; wherein the rehabilitating pipe is placed on the gradient adjustment member.

2. The gradient adjustment member includes a main body having a receiving portion that receives the rehabilitated pipe, and a pair of arms supported on both sides of the main body in the laying direction via the expansion / contraction means so that they can move forward and backward in the laying direction, and the abutment portion is provided at the end of each arm.

3. The gradient adjustment member has a pair of bridge members that cross each other at a middle portion, The abutment portions are provided at both ends of each bridging member, 2. A rehabilitating pipe gradient adjustment device as described in claim 1, wherein the expansion / contraction means includes a connecting shaft that connects the bridging members to each other at the intermediate portion in such a manner that the angle can be adjusted.

4. The gradient adjustment device according to claim 1 , wherein the gradient adjustment members are provided at a plurality of positions separated in the pipe axial direction within the existing pipe, and the opening widths of the gradient adjustment members at two different positions are different from each other.

5. A method for rehabilitating an existing pipe by installing a rehabilitation pipe in the existing pipe, comprising: A plurality of gradient adjustment members are arranged in the existing pipe at intervals in a pipe axial direction, At least a part of the gradient adjustment members among the plurality of members is laid in a laying direction along the pipe width of the existing pipe, By expanding and reducing the opening width along the laying direction between the abutting portions at both ends of each gradient adjustment member in the laying direction, the abutting portions at both ends abut against the inner wall of the existing pipe, A method for rehabilitating an existing pipe, characterized in that the rehabilitating pipe is placed and supported on the multiple gradient adjustment members.

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