Rehabilitation pipe support device

Abstract

To provide a rehabilitation pipe support device capable of easily correcting a gradient of a rehabilitation pipe according to situation at a rehabilitation construction site inside an existing pipe, and capable of stably supporting the rehabilitation pipe.SOLUTION: A rehabilitation pipe support device 3 has a plurality of support legs 30 that are spaced apart from one another on an inner bottom part 1b of an existing pipe 1. Each support leg 30 is extendable and contractible. A base plate 21 is placed on the support legs 30 for support. The base plate 21 supports a rehabilitation pipe 2. A top surface 34a of each support leg 30 that comes into contact with the base plate 21 is spherical.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a device for supporting from below a rehabilitating pipe to be installed inside an existing pipe, and more particularly to a rehabilitating pipe support device suitable for installing a rehabilitating pipe at an incline inside an existing pipe. [Background technology]

[0002] A rehabilitation method in which a rehabilitation pipe is installed inside an existing pipe to rehabilitate an aging sewer pipe or other existing pipe is known (see Patent Document 1, etc.). This type of rehabilitation pipe is given a predetermined slope to ensure flow performance. For example, known methods for giving a slope to a rehabilitation pipe include laying a punched metal or wire mesh at the bottom of the existing pipe (hereinafter referred to as the "inner bottom") and placing the rehabilitation pipe on top of that, or arranging reinforcing bars in the axial direction of the pipe and placing the rehabilitation pipe on top of that.

[0003] Patent Document 1 discloses a rehabilitation pipe support device that supports a rehabilitation pipe at a predetermined gradient. The rehabilitation pipe support device includes multiple short guide rails. These guide rails are installed at intervals on the inside bottom of the existing pipe, with their longitudinal direction oriented in the pipe axis direction. Both longitudinal ends of each guide rail are supported by two legs. The height and inclination angle of the guide rail are determined by the height of each leg. By placing the rehabilitation pipe on these guide rails, the rehabilitation pipe is given a predetermined gradient. Even in areas where the existing pipe has a reverse gradient, the guide rails can support the rehabilitation pipe at a predetermined normal gradient. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-196799 Summary of the Invention [Problem to be solved by the invention]

[0005] While gradient-imparting methods such as perforated metal, wire mesh, and rebar can make the rehabilitated pipe parallel to the existing pipe, it is not easy to make it non-parallel or to correct the gradient. In particular, correcting the gradient at the rehabilitation work site within the existing pipe is difficult.

[0006] In the aforementioned Patent Document 1, the interior of the existing pipe is surveyed in advance, and the height and angle of each guide rail are calculated in advance according to the installation location within the existing pipe, before manufacturing and installation. No adjustments are anticipated at the rehabilitation construction site within the existing pipe. However, the height, etc. of the manufactured guide rails may not match the actual required dimensions, which may result in the rehabilitated pipe being unable to achieve the required slope or the rehabilitated pipe being unstable. In such cases, remaking or replacing the guide rails is cumbersome and costly. In view of the above circumstances, the present invention aims to provide a rehabilitation pipe support device that can easily adjust the slope of a rehabilitation pipe according to the situation at a rehabilitation construction site within an existing pipe and can stably support the rehabilitation pipe. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a rehabilitation pipe support device that supports a rehabilitation pipe installed inside an existing pipe to be rehabilitated, A plurality of extendable support legs provided at a distance from each other on the inner bottom of the existing pipe; a base plate that is placed on and supported by the support legs and that receives the rehabilitation pipe; The top surface of the support leg is spherical.

[0008] In this rehabilitation pipe support device, the height of each support leg can be adjusted by extending or retracting it at the rehabilitation site. Furthermore, the height of the base plate at the position of each support leg can be adjusted. By adjusting the heights of multiple support legs relative to each other, the angle, or gradient, of the base plate can be adjusted. This allows the gradient of the rehabilitation pipe placed on the base plate to be easily adjusted according to the conditions at the rehabilitation site. There is no need to replace or remake components such as the support legs. Furthermore, even in places where the existing pipe has a reverse gradient, the height of the support legs can be adjusted to support the rehabilitated pipe at the specified gradient. Furthermore, because the top surfaces of the support legs are spherical, the contact angle of the base plate with the support legs can be set arbitrarily in all directions. Even if the base plate is curved to follow the curvature of the rehabilitating pipe, the axial direction of the support legs does not need to be aligned with the curvature of the base plate. For example, the axial direction of the support legs does not necessarily need to be perpendicular to the curved surface of the base plate. In this way, the rehabilitating pipe can be stably supported with a specified gradient.

[0009] Preferably, the support leg includes a leg base member fixed to the inner bottom portion, and a lifting member that is screw-connected to the leg base member and moves up and down along the leg base member, the lifting member protruding above the leg base member, and the upper end of the lifting member having a spherical top portion that includes the top surface. The support leg can be extended or retracted by rotating the lifting member and raising or lowering it along the leg base member. It is preferable that the leg base end member includes a bolt, and the lifting member includes a nut threadedly connected to the bolt.

[0010] Preferably, the base plate is curved in a downwardly convex arc shape when viewed in the axial direction of the existing pipe, thereby enabling stable support of the rehabilitating pipe.

[0011] Preferably, the bottom surface of the base plate is in contact with the top surface in a non-fixed state. That is, the base plate is simply placed on the support legs and does not need to be directly fixed to the support legs. The bottom surface of the base plate and the support legs are in almost point contact. This allows the contact angle and contact position of the base plate with the support legs to be freely adjusted.

[0012] Preferably, the rehabilitation pipe support device further includes an anchor member including a fixing portion fixed to the inner bottom portion and a locking portion locked to the base plate. The base plate can be fixed to the existing pipe by this. The fixing portion is not limited to being fixed directly to the inner bottom of the existing pipe, but may be fixed to the inner bottom of the existing pipe via the support legs.

[0013] The base plate may be provided on its bottom surface with a spherical receiving portion that is fitted onto a spherical top portion including the top surface of the support leg so as to be rotatable in all directions. This allows the contact angle of the base plate with respect to the support legs to be adjusted in all directions, and also allows the base plate to be stably supported. [Effects of the Invention]

[0014] According to the rehabilitation pipe support device of the present invention, the slope of the rehabilitation pipe can be easily adjusted according to the situation at the rehabilitation construction site inside the existing pipe, and the rehabilitation pipe can be stably supported. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a side cross-sectional view of an existing pipe being rehabilitated using a rehabilitation pipe support device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a plan cross-sectional view of the existing pipe during rehabilitation work, taken along line II-II in FIG. [Figure 3] FIG. 3 is a front cross-sectional view of the existing pipe during rehabilitation work, taken along line III-III in FIG. [Figure 4] FIG. 4 is an enlarged front cross-sectional view of a part of the rehabilitating pipe support device shown in FIG. 3 before a rehabilitating pipe is placed thereon. [Figure 5] FIG. 5 shows a second embodiment of the present invention and is a front cross-sectional view of a part of a rehabilitating pipe support device before a rehabilitating pipe is placed thereon. [Figure 6] FIG. 6 is a front cross-sectional view of a rehabilitating pipe support device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 4)> 1 and 2 show how to rehabilitate an aging existing pipe 1. The existing pipe 1 to be rehabilitated is a sewer pipe buried underground, but is not limited to this and may also be a water supply pipe, agricultural water pipe, gas pipe, hydroelectric power generation water pipe, tunnel, etc. As shown in FIG. 1, the existing pipe 1 may have not only a forward gradient portion 1A that slopes downward in the flow direction of fluid such as sewage (to the right in FIG. 1), but also a reverse gradient portion 1C that slopes in the opposite direction.

[0017] As shown by the two-dot chain line in Figure 2, a rehabilitation pipe 2 is installed inside the existing pipe 1, thereby rehabilitating the existing pipe 1. As shown in Figure 3, the rehabilitation pipe 2 has a slightly smaller diameter than the existing pipe 1. The rehabilitation pipe 2 may be a helical pipe made by spirally winding a long strip-shaped member made of synthetic resin, or it may be a shape-memory resin tube. The method for manufacturing the rehabilitation pipe 2 made from a helical pipe may be a push-type method in which a push-type pipe manufacturing machine installed at the starting end of the existing pipe 1 pushes the helical pipe into the existing pipe 1 while manufacturing the pipe, or a towing type method in which the manufactured rehabilitation pipe is pulled by a wire toward the destination end of the existing pipe.

[0018] As shown in Figure 1, the rehabilitating pipe 2 has a predetermined gradient to ensure flow performance. The gradient of the rehabilitating pipe 2 is a gradient that descends in the direction of flow, not only in the normally gradient section 1A of the existing pipe 1 but also in the reverse gradient section 1C. For this reason, the gap 4 between the inner circumferential surface of the bottom of the existing pipe 1 (hereinafter referred to as the "inner bottom section 1b") and the rehabilitating pipe 2 varies in width depending on the location.

[0019] As shown in FIG. 1, a rehabilitation pipe support device 3 is provided on the inner bottom 1b of the existing pipe 1. The rehabilitation pipe support device 3 supports the rehabilitation pipe 2 at a predetermined inclination. Therefore, the rehabilitation pipe support device 3 is sandwiched between the inner bottom 1b of the existing pipe 1 and the rehabilitation pipe 2, and is disposed in the inter-pipe bottom gap 4. The rehabilitation pipe support device 3 includes a plurality of support members 10 and a base plate installer 20. As shown in FIGS. 2 and 3, the support members 10 are arranged in two rows on either side of the circumferential center of the inner bottom 1b of the existing pipe 1, spaced apart in the pipe axial direction (the direction perpendicular to the plane of the paper in FIG. 3). The spacing between the support members 10 in the pipe axial direction is, for example, approximately 1 to 2 meters, but may be less than 1 meter or greater than 2 meters. As shown in FIG. 1, the size of the support member 10 may vary depending on the width of the inter-pipe bottom gap 4.

[0020] As shown in Figure 4, each support member 10 includes a base plate 11 and support legs 30. The base plate 11 is made of a roughly rectangular steel plate. The size of the base plate 11 depends on the diameter of the existing pipe 1, but is, for example, about 10 cm square. The base plate 11 is placed on the inner bottom 1b of the existing pipe 1 and fixed to the existing pipe 1 with anchor bolts 12.

[0021] As shown in Fig. 4, support legs 30 are erected on the base plate 11. As shown in Fig. 2, the support legs 30 of the multiple support members 10 are provided spaced apart from one another in the circumferential and axial directions of the inner bottom portion 1b of the existing pipe 1. As shown in Fig. 1, the angle of the support legs 30 as viewed from the side of the existing pipe 1 is oriented approximately vertically. As shown in Fig. 3, the angle of the support legs 30 as viewed from the axial direction of the existing pipe 1 is oriented approximately in the radial direction of the existing pipe 1.

[0022] As shown in Figure 4, the support leg 30 includes a leg base end member 31, a lifting member 32, and a leg upper end member 33. The leg base end member 31 includes a bolt 31a and is formed in an axial shape that intersects with the base plate 11. The lower end of the leg base end member 31 abuts against the front surface of the base plate 11 and is welded to the base plate 11. In this way, the leg base end member 31 is fixed to the inner bottom 1b of the existing pipe 1 via the base plate 11.

[0023] The lifting member 32 includes a nut 32a and is formed in a cylindrical shape. The lower portion of the nut 32a is threadedly engaged with the bolt 31a. This allows the lifting member 32 to be threadably connected to the leg base end member 31. When the lifting member 32 is turned, the interaction between the nut 32a and the bolt 31a causes the lifting member 32 to rise and fall along the leg base end member 31. Although not shown in detail, the outer circumferential surface of the lifting member 32 forms an operating portion 32b with a hexagonal cross section that fits with the screwdriver tool 5. The upper portion of the lifting member 32 protrudes above the leg base end member 31.

[0024] A leg upper end member 33 is provided at the upper end of the lifting member 32. The leg upper end member 33 includes a bolt 33a and a spherical top portion 34. The bolt 33a is threadedly engaged with the upper portion of the nut 32a. The lifting member 32 straddles the leg base end member 31 and the leg upper end member 33. When the lifting member 32 is raised or lowered, the leg upper end member 33 is raised or lowered integrally therewith. This causes the support leg 30 to extend or retract up and down. Consequently, the height of the support member 10 is adjusted. The lifting member 32 and the leg upper end member 33 may be formed from a single member.

[0025] A spherical top portion 34 is provided at the upper end of the bolt 33a of the leg upper end member 33. A top surface 34a of the spherical top portion 34 is formed in an upwardly convex spherical shape.

[0026] As shown in Figures 1 and 2, a base plate installation body 20 is installed above the inner bottom 1b of the existing pipe 1 so as to cover the multiple support members 10. A rehabilitation pipe 2 is placed on the base plate installation body 20. The base plate installation body 20 includes multiple base plates 21 arranged in the pipe axial direction. The base plates 21 are made of steel plates. Each base plate 21 supports a rehabilitation pipe 2.

[0027] As shown in FIG. 3, the base plate 21 is curved to form a downwardly convex arc when viewed in the pipe axis direction of the existing pipe 1 (a direction perpendicular to the plane of the paper in FIG. 3). In other words, the base plate 21 is a partially cylindrical curved plate that fits along the bottom of the existing pipe 1 and the rehabilitating pipe 2. A recess 21a is formed on the top surface of the base plate 21. The rehabilitating pipe 2 fits into the recess 21a. The radius of curvature of the top surface of the base plate 21 is equal to or slightly larger than the radius of the outer circumferential surface of the rehabilitating pipe 2. The thickness of the base plate 21 is preferably several millimeters, and more preferably about 3 mm. The length of the base plate 21 along the pipe axis direction (a direction perpendicular to the plane of the paper in FIG. 3) is large enough to be inserted into the existing pipe 1 through a manhole (not shown), and is, for example, about 1 to 2 meters.

[0028] As shown in Fig. 2, each base plate 21 is supported at four (plural) locations spaced apart in the pipe axial direction and circumferential direction by the support legs 30 of the four (plural) support members 10. As a result, the entire base plate 21 is positioned above the inner bottom portion 1b of the existing pipe 1. The base plate 21 is simply placed on the support legs 30 and is not directly fixed to the support legs 30. As shown in Fig. 4, the bottom surface 21b of the base plate 21 is in approximately point contact with the spherical top surface 34a of the support leg 30 in an unfixed state.

[0029] 3 and 4, restricting plates 23 (stoppers) are provided hanging down from both ends of the base plate 21 in the pipe circumferential direction. The restricting plates 23 are arranged further outward in the pipe circumferential direction than the support legs 30 (to the right in FIG. 4). When the base plate 21 is displaced in the pipe circumferential direction, the restricting plates 23 abut against the support legs 30. In this way, the displacement of the base plate 21 in the pipe circumferential direction is restricted by the restricting plates 23.

[0030] An anchor member 40 is provided near each support member 10. The anchor member 40 is formed in the shape of a straight pin or nail. The pointed lower end of the anchor member 40 forms an anchoring portion 41. The anchoring portion 41 is driven into the inner bottom portion 1b of the existing pipe 1, thereby fixing the anchor member 40 to the inner bottom portion 1b. The large-diameter head of the anchor member 40 forms an engaging portion 42 that engages with the base plate 21.

[0031] As shown in Fig. 3, a hole 21c is formed in the portion of the base plate 21 corresponding to the anchor member 40. The hole 21c is covered from below by a locking plate 22. The locking plate 22 is joined to the base plate 21 by welding or the like. The anchor member 40 penetrates the locking plate 22, and the locking portion 42 is hooked onto the upper surface of the locking plate 22. This restrains the base plate 21 from moving.

[0032] The rehabilitation work of the existing pipe 1 is carried out, for example, as follows. The inner circumference of the existing pipe 1 is measured in advance using a laser distance meter or similar device, and a three-dimensional diagram of the inner surface of the existing pipe 1 is created. The laser distance meter is installed in a manhole on one end of the existing pipe 1 in the axial direction. If the pipe is difficult to pass through, a laser distance meter is also installed in a manhole on the opposite side, and the measurement data is combined. A water line may also be used for the survey. In addition, the design diameter and design gradient of the rehabilitation pipe are determined based on the required flow rate of fluids such as sewage to be flowed through the rehabilitation pipe. The height and size of the support member 10 at each position on the inner bottom 1b of the existing pipe 1 are determined according to the design gradient.

[0033] Thereafter, the support members 10 are installed at various positions on the inner bottom 1b of the actual existing pipe 1. The height of the support legs 30 of each support member 10 is adjusted to a height determined according to the installation position. The height of the support legs 30 can be easily adjusted by turning the nuts 32a. Next, the base plate laying body 20 is laid. Each base plate 21 of the base plate laying body 20 is supported by four (plural) support members 10. At this time, the base plate 21 is simply placed on the support members 10. Even if the base plate 21 is curved, the spherical top surfaces 34a of the support legs 30 are in reliable contact with the base plate 21, so that the base plate 21 can be supported. There is no need to adjust the axial direction of the support legs 30 so that it is perpendicular to the curved surface of the base plate 21, for example.

[0034] Next, it is confirmed whether the base plate laying body 20 has a predetermined gradient (design gradient). If the gradient is not as specified, the height can be adjusted by extending or retracting the support legs 30 of each support member 10. The screwdriver 5 is inserted into the gap 4c (Fig. 4) between the base plate 21 and the bottom of the existing pipe 1b, fitted into the operating part 32b, and the nut 32a is turned to extend or retract the support legs 20. This allows the gradient of the base plate laying body 20 to be corrected at the rehabilitation construction site, and ultimately the gradient of the rehabilitated pipe 2. Therefore, the strictness of the preliminary survey and the calculation of the design gradient can be relaxed. After the base plate laying body 20 is set to a predetermined gradient, each base plate 21 is fixed to the existing pipe 1 by the anchor members 40.

[0035] The rehabilitation pipe 2 is then installed on the base plate installation body 20. The rehabilitation pipe 2 is stably installed by fitting into the recess 21a on the upper surface of the arc-shaped base plate 21. The slope of the rehabilitation pipe 2 follows the slope of the base plate installation body 20. This allows the rehabilitation pipe 2 to be stably supported with a predetermined slope. Regardless of whether the existing pipe 1 is in the forward slope portion 1A or the reverse slope portion 1C, the rehabilitation pipe support device 3 can make the slope of the rehabilitation pipe 2 constant.

[0036] Next, another embodiment of the present invention will be described. In the following embodiment, the same components as those already described will be denoted by the same reference numerals in the drawings, and the description thereof will be omitted. <Second embodiment (Fig. 5)> As shown in FIG. 5 , in a rehabilitation pipe support device 3B according to the second embodiment of the present invention, an anchor member 40B intersects with a base plate 11 of a support member 10. A male screw 41b is formed in the fixing portion 41 of the anchor member 40B. A female screw hole 11b is formed in, for example, the center of the base plate 11. The male screw 41b is screwed into the female screw hole 11b. This joins the fixing portion 41 of the anchor member 40B to the base plate 11. Note that the joining means between the fixing portion 41 and the base plate 11 is not limited to screw joining, and may also be welding, etc. Both sides of the anchor member 40B on the base plate 11 are fixed to the existing pipe 1 by two (or multiple) anchor bolts 12. Therefore, the anchor member 40B is fixed to the inner bottom portion 1b of the existing pipe 1 via the support member 10.

[0037] <Third embodiment (Fig. 6)> 5, in a rehabilitation pipe support device 3C according to a third embodiment of the present invention, a base plate 51 of a support member 50 is formed in the shape of a plate extending in an arc shape on both sides in the circumferential direction of the pipe, sandwiching the center of the inner bottom portion 1b of the existing pipe 1. A pair of support legs 60 are erected on both ends of the base plate 51 in the circumferential direction of the pipe.

[0038] That is, the support member 50 of the third embodiment has a structure in which the base plates 11 of two support members 10 of the first embodiment (FIG. 3) arranged side by side in the circumferential direction of the pipe are integrally connected to each other. The length of the base plate 51 along the circumferential direction of the pipe is, for example, about 10 cm to several tens of cm, depending on the pipe diameter of the existing pipe 1 and other factors. Although detailed illustration is omitted, a plurality of support members 50 are arranged at intervals in the pipe axial direction (the direction perpendicular to the plane of the paper in FIG. 5) on the inner bottom portion 1b of the existing pipe 1.

[0039] Each support leg 60 of the support member 50 includes an axial leg base member 61 including a bolt 61a, and a cylindrical lifting member 62 including a nut 62a. The lower end of the leg base member 61 is butted against and welded to the base plate 51. The nut 62a is threaded onto the bolt 61a, thereby threadably connecting the leg base member 61 and the lifting member 62. The upper portion of the lifting member 62 protrudes above the leg base member 61. A spherical top end 63 is integrally formed with the upper end of the lifting member 62, and the top surface 63a of the spherical top end 63 is spherical and convex upward. The axis of the support leg 60 is oriented vertically, so that the height of the support leg 60 can be easily adjusted.

[0040] A base plate laying body 20 is laid on the support member 50, and a rehabilitation pipe 2 is placed on the base plate laying body 20.

[0041] A spherical receiving portion 70 is provided on the bottom surface 21b of the base plate 21 of the base plate laying body 20 so as to protrude downward. A concave spherical portion 71 is formed on the spherical receiving portion 70, which opens to the underside of the spherical receiving portion 70. The spherical top end 63 is fitted into the concave spherical portion 71 so as to be rotatable in all directions. This allows the angle of the base plate 21 relative to the support leg 60 to be adjusted in all directions, and the base plate 21 can be stably supported by the support member 50. In addition, the anchor member 40 (Fig. 4) can be omitted.

[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 invention. For example, the base end member of the support leg may include a nut, and the lifting member may include a bolt that is threadedly coupled to the nut. The extension and retraction mechanism of the support legs is not limited to screw coupling, and may be configured by a gear mechanism such as a rack and pinion. The base plate 21 may be flat. [Industrial Applicability]

[0043] The present invention can be applied to, for example, the rehabilitation of deteriorated sewer pipes. [Explanation of symbols]

[0044] 1 Existing pipes 1A Slow gradient section 1b Inner bottom 1C Reverse gradient section 2 Rehabilitation pipe 3 Rehabilitation pipe support device 3B,3C Rehabilitation pipe support device 10 Support member 11 Base plate 20 Baseplate installation body 21 Baseplate 21b Bottom 23 Restriction plate (restriction part) 30 Support legs 31 Leg base end member 31a Bolt 32 Lifting member 32a nut 33 Upper end member of leg 34 Spherical top 34a top surface 40 Anchor member 40B Anchor member 41 Fixing section 42 Locking part 50 Support member 51 Base plate 60 Support legs 61 Leg base end member 61a Bolt 62 Lifting member 62a Nut 63 Apex 63a top surface 70 Spherical receiving part 71 Concave spherical part

Claims

1. A rehabilitation pipe support device that supports a rehabilitation pipe installed inside an existing pipe to be rehabilitated, A plurality of extendable support legs provided at a distance from each other on the inner bottom of the existing pipe; a base plate that is placed on and supported by the support legs and that receives the rehabilitation pipe; wherein the top surfaces of the support legs are spherical.

2. 2. The rehabilitation pipe support device of claim 1, wherein the support leg includes a leg base member fixed to the inner bottom portion and a lifting member that is screw-connected to the leg base member and moves up and down along the leg base member, the lifting member protruding above the leg base member, and the upper end of the lifting member having a spherical top portion including the top surface.

3. 2. The rehabilitating pipe support device according to claim 1, wherein the base plate is curved in a downwardly convex arc shape when viewed in the axial direction of the existing pipe.

4. The rehabilitating pipe support device according to any one of claims 1 to 3, wherein the bottom surface of the base plate is in contact with the top surface in an unfixed state.

5. The rehabilitation pipe support device according to any one of claims 1 to 3, further comprising an anchor member including a fixing portion fixed to the inner bottom portion and a locking portion locked to the base plate.

6. A rehabilitation pipe support device as described in any one of claims 1 to 3, wherein the bottom surface of the base plate is provided with a spherical receiving portion that is rotatably engaged with a spherical top portion including the top surface of the support leg in all directions.

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