Existing pipe rehabilitating spacer device and existing pipe rehabilitating method

Abstract

To provide a spacer device for regenerating an existing pipe, which enables an anchoring member to be driven into the existing pipe while avoiding hard materials such as reinforcements and aggregates in the existing pipe having a reinforced concrete structure, and which can be installed at a desired position on the inner periphery of the existing pipe.SOLUTION: A spacer device 10 for regenerating an existing pipe is arranged between a regeneration pipe 3 constructed in the existing pipe 1 of a reinforced concrete structure and the existing pipe. The longitudinal direction of a spacer 11 of the spacer device 10 for regenerating the existing pipe is directed to the pipe axial direction of the existing pipe 1. The spacer 11 is engaged with the inner peripheral surface of the existing pipe 1 by an engaging means 20 so as to be approachable / separable and fixable. The spacer 11 is formed with a plurality of engaging holes 32 approaching or extending at least in the width direction out of the longitudinal direction and the width direction. The engaging means 20 includes a fixing member 22 driven into the existing pipe 1 through the selected one engaging hole 32.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a spacer device used for rehabilitating an existing pipe and an existing pipe rehabilitation method, and more particularly to an existing pipe rehabilitation spacer device that is arranged between an existing pipe and a rehabilitation pipe to be constructed within the existing pipe, and an existing pipe rehabilitation method using the existing pipe rehabilitation spacer device. [Background technology]

[0002] A known method for rehabilitating existing pipes such as aging sewer pipes involves lining the inner periphery of the existing pipe with a rehabilitation pipe and filling the gap between the outer periphery of the rehabilitation pipe and the inner periphery of the existing pipe with backfill material (see Patent Document 1, etc.). Patent Document 1 describes the installation of a spacer device (floating prevention device) on the inner circumferential surface of the upper half of the existing pipe prior to lining the rehabilitating pipe. The spacer device includes a straight beam-shaped spacer, an anchoring member such as a concrete screw, and a retractable member such as a set screw. The spacer is aligned along the inner circumferential surface of the existing pipe with its longitudinal direction aligned with the axial direction of the existing pipe, and the anchoring member is driven into the existing pipe through the spacer's engaging hole. At this time, the spacer can be moved toward or away from the inner circumferential surface of the existing pipe along the axial direction of the anchoring member. Next, a retractable member such as a set screw threaded into the spacer's female threaded hole protrudes from the spacer and abuts against the inner circumferential surface of the existing pipe. This fixes the spacer at a predetermined distance from the inner circumferential surface of the existing pipe. The outer circumferential surface of the rehabilitating pipe is then placed against the spacer. This secures a backfilling space between the existing pipe and the rehabilitating pipe. This prevents the rehabilitating pipe from floating up during backfilling. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-082430 Summary of the Invention [Problem to be solved by the invention]

[0004] Many existing pipes, such as sewer pipes, are made of reinforced concrete. Therefore, reinforcing bars, such as main reinforcement and distribution bars, may be placed in the existing pipe at the installation location of the anchoring member. This makes it impossible to drive the anchoring member to a sufficient depth. Furthermore, if a hard mixture, such as aggregate, in the concrete of the existing pipe is present at the installation location of the anchoring member, it becomes difficult to drive the anchoring member. Ultimately, this makes it impossible to install the existing pipe rehabilitation spacer device so that it can approach and move away from the inner surface of the existing pipe. In view of the above circumstances, the present invention aims to provide a spacer device for rehabilitating existing pipes that can drive anchoring members into existing pipes while avoiding hard materials such as reinforcing bars and aggregates in existing pipes with reinforced concrete structures, and that can be installed at a desired position on the inner circumference of the existing pipe. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides an existing pipe rehabilitation spacer device that is arranged between a rehabilitation pipe constructed in an existing pipe of a reinforced concrete structure and the existing pipe, a spacer having a longitudinal direction oriented in the axial direction of the existing pipe; a retractable member that can retract from the spacer toward the existing pipe; a fixing member that is engaged with the spacer and fixed to the existing pipe; The spacer has a plurality of fastening holes formed therein, the fastening holes being adjacent to or extending in at least the width direction out of the width direction perpendicular to the length direction and the length direction, The fixing member is driven into the existing pipe through a selected one of the engagement holes.

[0006] The existing pipe rehabilitation spacer device is preferably installed around the inner periphery of the existing pipe before the new pipe is constructed. The spacer is aligned along the inner periphery of the existing pipe, and the anchoring members are driven into the existing pipe through the first engaging hole. If the anchoring members hit hard materials such as rebar or aggregate inside the existing pipe, the driving position of the anchoring members within the first engaging hole is changed in the direction of extension of the hole, or the driving position of the anchoring members is changed to another nearby engaging hole. This allows the driving position to be shifted at least in the circumferential direction of the existing pipe, either in the axial direction or the circumferential direction. As a result, the anchoring members can be driven into the existing pipe while avoiding hard materials without changing the position of the spacer. After installing the spacer device for rehabilitating existing pipes, the rehabilitating pipe is constructed. Then, the spacer is interposed between the rehabilitating pipe and the existing pipe, thereby ensuring backfill space.

[0007] Preferably, the spacer has, as the fastening holes, two adjacent elongated holes each extending in one of the longitudinal direction and the width direction, which are arranged offset from each other in the other of the longitudinal direction and the width direction. For example, two elongated holes extending in the longitudinal direction of the spacer body may be arranged offset from each other in the width direction, or two elongated holes extending in the width direction of the spacer body may be arranged offset from each other in the longitudinal direction.

[0008] More preferably, the two adjacent slots are offset obliquely in a direction intersecting the extending direction of each other. As a result, if an anchoring member driven through one slot hits a hard material such as rebar or aggregate, the position where the anchoring member is driven can be shifted diagonally and driven into the other slot. This allows the anchoring member to be driven into the existing pipe while reliably avoiding hard materials such as rebar or aggregate. In particular, it can be driven while reliably avoiding rebar extending in the axial or circumferential direction of the pipe. It also prevents a decrease in the rigidity of the spacer.

[0009] Preferably, one of the two adjacent slots is disposed at the center in the width direction of the spacer, and the other slot is disposed offset from the center in the width direction of the spacer. This allows the load balance of the spacer to be maintained well by basically selecting the central long hole and driving the anchoring member through that central long hole. If the anchoring member hits a hard material such as rebar or aggregate and cannot be driven to the required depth, the driving position can be changed to a long hole offset from the center. This allows the anchoring member to be driven into the existing pipe while avoiding the hard material.

[0010] It is preferable that the engagement hole includes a first elongated hole portion extending in the longitudinal direction and a second elongated hole portion extending in the width direction and intersecting the first elongated hole portion. This allows the position at which the anchoring member is driven into a single attachment hole to be changed in the longitudinal and width directions of the spacer, allowing the anchoring member to be driven into an existing pipe while reliably avoiding hard materials such as rebar and aggregate.

[0011] The method of the present invention is a method for rehabilitating an existing pipe by constructing a rehabilitation pipe within the existing pipe using the existing pipe rehabilitation spacer device, This is carried out prior to or in parallel with the construction of the rehabilitation pipe. a step of aligning the spacer along an inner peripheral surface of the existing pipe with a longitudinal direction of the spacer in a pipe axis direction of the existing pipe; a step of adjusting the amount of protrusion and retraction of the protrusion and retraction member; driving the anchoring member into the existing pipe through the selected fastening hole; Equipped with During the driving process, if a hard material in the existing pipe prevents the anchoring member from being driven to the required depth, the driving position of the anchoring member is changed to another nearby fastening hole or to a different position within the same fastening hole. This allows the anchoring member to be driven into the existing pipe to the required depth while trying out different driving positions and avoiding hard materials such as reinforcing bars, aggregates, and other hard mixtures in the existing pipe.

[0012] Preferably, in the driving step, the first selected fastening hole is the fastening hole arranged at the center in the width direction of the spacer, or the first driving position is at the center in the width direction of the spacer. This basically allows the fixing member to be engaged with the center of the spacer in the width direction, ensuring a balanced load applied to the spacer. [Effects of the Invention]

[0013] According to the present invention, the anchoring member can be driven into the existing pipe while avoiding hard materials such as reinforcing bars and aggregates in the existing pipe with a reinforced concrete structure, and the existing pipe rehabilitation spacer device can be installed at the desired position on the inner circumference of the existing pipe. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a side cross-sectional view taken along the pipe axis direction of an existing pipe that has been rehabilitated using an existing pipe rehabilitating spacer device according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a front cross-sectional view taken along line II-II in FIG. 1, perpendicular to the pipe axis of the rehabilitated existing pipe. [Figure 3] Fig. 3(a) is a plan view of a spacer of the existing pipe rehabilitating spacer device, and Fig. 3(b) is a bottom view of the spacer. [Figure 4] Fig. 4(a) shows an example of the state in which the fixing member of the existing pipe rehabilitating spacer device is driven in, and Fig. 4(b) is a side cross-sectional view taken along line IVa-IVa in Fig. 4(b), and Fig. 4(b) is a front cross-sectional view taken along line IVb-IVb in Fig. 4(a). [Figure 5] Fig. 5(a) is a plan view of a fastening hole formed in the spacer, and Fig. 5(b) is a plan view showing a modified example of the fastening hole. [Figure 6] 6(a) to 6(c) are bottom views showing examples of selection of driving positions for fixing members of the existing pipe rehabilitating spacer device. [Figure 7]Fig. 7(a) is a plan view of a spacer of an existing pipe rehabilitating spacer device according to a second embodiment of the present invention, and Fig. 7(b) is an enlarged plan view of a circle VIIb in Fig. 7(a). DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 6)> 1 and 2 show a rehabilitated existing pipe 1. The existing pipe 1 is a sewer pipe buried underground, but is not limited to this and may also be a water supply pipe, an agricultural irrigation pipe, a hydroelectric power generation water pipe, a gas pipe, or a tunnel.

[0016] As shown in Figures 1 and 2, the existing pipe 1 has a reinforced concrete structure. That is, the existing pipe 1 is composed of a reinforced concrete pipe including reinforcing bars 1a and concrete 1c. The reinforcing bars 1a include main reinforcements 1b and distribution reinforcements 1d arranged in a lattice or mesh pattern. The main reinforcements 1b are formed in a ring shape along the circumferential direction of the pipe. The distribution reinforcements 1d extend in the axial direction of the pipe and intersect with the main reinforcements 1b.

[0017] As shown in Figure 4(a), the concrete 1c further contains aggregate 1e and other hard mixtures. The reinforcing bars 1a, aggregate 1e, and other hard mixtures constitute the hard material 1f inside the existing pipe 1.

[0018] 1 and 2, a rehabilitation pipe 3 is lined along the inner periphery of an aged existing pipe 1. The rehabilitation pipe 3 is composed of a helical pipe formed by helically winding a long strip-shaped member 3a made of a synthetic resin such as polyvinyl chloride.

[0019] As shown in Figure 2, an annular backfill space 2 is formed between an existing pipe 1 and a rehabilitation pipe 3. The backfill space 2 is filled with a backfill material 4. The backfill material 4 is made of mortar or cement milk.

[0020] 1 and 2, an existing pipe rehabilitation spacer device 10 is provided in a backfill space 2 between the inner peripheral surface of the upper half (portion from the top to the side) of an existing pipe 1 and a rehabilitation pipe 3. Preferably, the existing pipe rehabilitation spacer device 10 is disposed on the inner peripheral surface near the top or in the upper part of the existing pipe 1. As shown in FIG. 1, the existing pipe rehabilitation spacer device 10 includes a plurality of spacers 11 and an attachment means 20 provided for each spacer 11.

[0021] As shown in Figure 3(a), the spacer 11 has a straight, elongated shape. As shown in Figures 3(b) and 4(b), the spacer 11 has a top plate portion 12 and a pair of L-shaped side plate portions 13, and is formed into a C-shaped cross section with an open bottom. The length L of the spacer 11 is 11 (Fig. 3(a)) is, for example, L 11 The width W of the spacer 11 is about 1000 mm to 2000 mm. 11 (Fig. 4(b)) is, for example, W 11 The height H of the spacer 11 is about 25 mm to 150 mm. 11 (FIG. 4(b)) is set to be equal to the minimum gap amount of the portion in the backfill space 2 (FIG. 2) where the existing pipe rehabilitation spacer device 10 is placed, and for example, H 11 =15mm~100mm. Preferably, the spacer 11 is made of a metal such as steel or iron. The spacer 11 may be made of a flat bar (flat steel material).

[0022] As shown in Fig. 1, the longitudinal direction of the spacer 11 is oriented in the pipe axis direction of the existing pipe 1 (left-right direction in Fig. 1). A plurality of spacers 11 are arranged in a row along the pipe axis direction on the inner peripheral surface of the upper half of the existing pipe 1. Adjacent spacers 11 may be connected to each other by connecting means (not shown), or may simply be butted against each other without being connected, or may be spaced apart from each other within a predetermined distance (for example, within 50 mm).

[0023] 1 and 2, each spacer 11 is attached to the inner circumferential surface of the existing pipe 1 via an attachment means 20 so that it can be moved toward and away from the inner circumferential surface and can be fixed thereto. The attachment means 20 includes a plurality of retractable members 21 and an anchoring member 22. The retractable members 21 are capable of extending and retracting from the spacer 11 toward the existing pipe 1. The anchoring members 22 are attached to the spacer 11 and are anchored to the existing pipe 1.

[0024] 4(a), the retractable member 21 is configured by, for example, a hollow set screw (a set screw). 21 is the height dimension H of the spacer 11 11 The nominal thread diameter of the retractable member 21 is preferably M10 to M20. Preferably, the tip 21a of the retractable member 21 is flat. The screw driving operation part 21b at the base end of the retractable member 21 is directed inward in the pipe diameter direction (downward in FIG. 4(a)). The operation part 21b is configured as a hexagonal hole, but is not limited to this, and may be a slot in the shape of a straight line, a cross, or the like.

[0025] As shown in Fig. 4, the anchoring member 22 is formed of, for example, a concrete screw (rod-shaped fastening body). The leg portion 23 (driven portion) of the anchoring member 22 protrudes from the top plate portion 12 of the spacer 11 and is driven into the existing pipe 11 to be fixed thereto. The head portion 24 (fastening portion) of the anchoring member 22 protrudes from the inner circumferential surface of the existing pipe 11 into the space within the pipe and is fastened to the spacer 11. Preferably, the protrusion amount H of the head portion 24 is 24 is the height H of the spacer 11 11 Smaller (H 24 <H 11 ), and the head 24 is disposed inside the spacer 11 so as not to protrude from the spacer 11 to the inside of the pipe (the lower side in FIG. 4(a)).

[0026] As shown in FIGS. 3 and 4, the spacer 11 is provided with an engagement portion 30 for engaging with the fastening means 20. The engagement portion 30 includes a nut 31 that engages with the retractable member 21 and an engagement hole 32 that engages with the anchoring member 22. Specifically, as shown in FIG. 3(b), a plurality of nuts 31 are attached by welding or the like to the inner surface of the top plate portion 12 of the spacer 11 (the surface facing away from the existing pipe 1) at intervals in the longitudinal direction (the left-right direction in the figure). Female threaded holes 31a are formed in the nuts 31. In other words, the spacer 11 has a plurality of female threaded holes 31a. As shown in FIG. 4(a), the female threaded holes 31a penetrate the spacer 11 in the thickness direction through through holes 33 formed in the top plate portion 12. A retractable member 21 is screwed into each female threaded hole 31a. The retractable member 21 can be advanced or retracted from the spacer 11 toward the inner surface of the existing pipe 1 by operating the screwdriver operating portion 21b. The maximum amount of protrusion of the retractable member 21 from the spacer 11 is preferably about 20 mm.

[0027] As shown in FIG. 3(a), a plurality of fastening holes 32 are formed in the top plate portion 12 of the spacer 11. The fastening holes 32 are adjacent to or extend in at least the width direction (the up-down direction in FIG. 3(a)) of the width direction and the longitudinal direction, which are perpendicular to the longitudinal direction of the spacer 11. In this embodiment, the fastening holes 32 are elongated holes 34, 35 whose major axes are oriented in the longitudinal direction of the spacer 11 (the left-right direction in FIG. 3(a)). Therefore, the fastening holes 32 extend in the longitudinal direction of the spacer 11.

[0028] Preferably, one engagement hole set 36 is formed by two adjacent engagement holes 32, i.e., elongated holes 34, 35. The elongated holes 34, 35 extend in one of the longitudinal direction and width direction of the spacer 11 and are offset from each other in the other of the longitudinal direction and width direction. In this embodiment, the two adjacent elongated holes 34, 35 extending in the longitudinal direction are arranged offset from each other in the width direction. Therefore, the engagement holes 32 extend in the longitudinal direction of the spacer 11 and are adjacent to each other in the width direction of the spacer 11. Moreover, the two adjacent elongated holes 34, 35 are offset obliquely from each other in a direction intersecting the extension direction.

[0029] A plurality of sets of engaging holes 36 are arranged at intervals in the longitudinal direction of the spacer 11. The interval between adjacent sets of engaging holes 36 is sufficiently larger than the amount of longitudinal offset between the elongated holes 34, 35 in each set of engaging holes 36.

[0030] As shown in FIG. 5(a), the major axis L of each engaging hole 32 32 (length along the major axis) is preferably equal to or less than the diameter D of the leg 23 of the anchoring member 22 23 and the diameter D of the main reinforcement 1b of the reinforcing bar 1a 1b and (L 32 >2×D 23 +D 1b ).

[0031] As shown in Fig. 5(b), each of the fastening holes 32 may have a length that spans the adjacent main reinforcement 1b. In this case, the major axis L 32 is preferably the diameter D of the leg 23 of the anchoring member 22 23 and the diameter D of the main reinforcement 1b 1b and the pitch P between adjacent main reinforcement bars 1b 1b greater than the sum of (L 32 >2×D 23 +D 1a +P 1b ).

[0032] 1 and 4, some of the engagement holes 32 of the spacer 11 are selected, and the anchoring members 22 are engaged in the engagement holes 32. Preferably, the anchoring members 22 are engaged in one of the engagement holes 32 (34 or 35) of the engagement hole sets 36 at both ends of the spacer 11. The legs 23 of the anchoring members 22 are driven into the existing pipe 1 through the selected one of the engagement holes 32.

[0033] By adjusting the amount of protrusion of the retractable member 21 and the amount of driving of the fixing member 22, the spacer 11 is engaged with the inner peripheral surface of the existing pipe 1 so as to be movable toward and away from the inner peripheral surface and to be fixed thereto. As shown in Figure 4(a), in the fixed state of the spacer 11, the head 24 of the fixing member 22 is hooked onto and engaged with the inner surface around the engaging hole 32 in the top plate portion 12 of the spacer 11. This prevents the spacer 11 from moving away from the inner circumferential surface of the existing pipe 1. Furthermore, the protruding and retracting member 21 protruding from the spacer 11 abuts against the inner circumferential surface of the existing pipe 1. This prevents the spacer 11 from moving closer to the inner circumferential surface of the existing pipe 1. Although not shown in the drawings, the retractable member 21 may be retracted into the spacer 11 , and the spacer 11 may be in contact with the inner peripheral surface of the existing pipe 1 .

[0034] Using the existing pipe rehabilitation spacer device 10, the existing pipe 1 is rehabilitated as follows. 4, the installation work of the existing pipe rehabilitation spacer device 10 is carried out prior to or in parallel with the construction of the rehabilitation pipe 3. That is, the spacer 11 is placed along the inner circumference of the upper half of the existing pipe 1 with its longitudinal direction facing the axial direction of the existing pipe 1 (placement step), and each anchoring member 22 is passed through a selected one of the multiple engagement holes 32 and driven into the concrete 1c of the existing pipe 1 (driving step).

[0035] As shown by the two-dot chain lines in Figures 4(a) and 4(b), the first engagement hole 32 selected in the driving step is preferably the elongated hole 34 located in the center of the width of the spacer 11. This causes the initial driving position of the fixing member 22 to be the center of the width of the spacer 11. Therefore, as shown in Figure 2, it is basically possible to engage the fixing member 22 with the center of the width of the spacer 11, ensuring a balanced load applied to the spacer 11.

[0036] The driving depth is set to a depth at least such that the fixing member 22 does not fall out of the existing pipe 1, and preferably such that the spacer 11 can be suspended and supported so as to be movable toward and away from the existing pipe 1 (up and down).

[0037] If the anchoring member 22 hits a hard material 1f such as reinforcing bars 1a or aggregate 1e in the concrete 1c during driving and prevents the anchoring member 22 from being driven to the required depth, the driving position of the anchoring member 22 is changed to another nearby engaging hole 32 or to a different position within the same engaging hole 32.

[0038] For example, first, as shown by the two-dot chain line in Fig. 6(a), the fixing member 22 is driven through the center of the elongated hole 34. Then, if the fixing member 22 cannot be driven to the required depth due to the hard material 1f, the fixing member 22 is driven through the center of another adjacent elongated hole 35 that is diagonally shifted, as shown by the solid line in Fig. 6(a). If the fixing member 22 still cannot be driven to the required depth, the fixing member 22 is driven through the end of the elongated hole 34, as shown in Fig. 6(b).

[0039] Alternatively, the fixing member 22 may first be driven through the center of the elongated hole 34 (dotted line in Figure 6(a)), and if it cannot be driven to the required depth, it may be driven through the end of the same elongated hole 34 (Figure 6(b)), and if it still cannot be driven to the required depth, it may be driven through the center of another elongated hole 35 (solid line in Figure 6(a)).

[0040] Alternatively, the fixing member 22 may first be driven through the center of the elongated hole 34 (dotted line in Figure 6(a)), and if it cannot be driven to the required depth, it may be driven through the center of another elongated hole 35 (solid line in Figure 6(a)), and if it still cannot be driven to the required depth, it may be driven through the end of the elongated hole 35 (Figure 6(c)). In addition, the driving position or the driving engaging hole 32 can be changed as desired through trial and error.

[0041] 4(a) and 4(b), the anchoring member 22 can be driven reliably to the required depth into the existing pipe 1 while avoiding hard materials 1f such as reinforcing bars 1a and aggregates 1e. This eliminates the need to change the position of the spacer 11. As a result, the existing pipe rehabilitation spacer device 10 can be installed at a desired position on the existing pipe 1. In addition, the retractable member 21 screwed into the nut 31 is made to protrude from the spacer 11 toward the inner peripheral surface of the existing pipe 1.

[0042] Thereafter, the rehabilitating pipe 3 is constructed. At this time, by readjusting the protrusion amount of the retractable member 21 and the driving amount of the anchoring member 22, the spacer 11 is fixed to the inner surface of the existing pipe 1 so that it cannot move toward or away from the pipe, and the top or upper part of the rehabilitating pipe 3 is in contact with the bottom surface of the spacer 11. This positions the existing pipe rehabilitating spacer device 10 between the rehabilitating pipe 3 and the existing pipe 1, ensuring a backfill space 2 at the height of the existing pipe rehabilitating spacer device 10. Therefore, as shown in Figure 2, after the rehabilitating pipe is constructed, the backfill material 4 can be reliably injected and filled between the rehabilitating pipe 3 and the existing pipe 1.

[0043] During the injection of the backfill material 4 and before it hardens, the rehabilitating pipe 3 is pressed against the existing pipe rehabilitating spacer device 10 by the buoyancy of the backfill material 4. This prevents the rehabilitating pipe 3 from floating up. Therefore, the existing pipe rehabilitating spacer device 10 functions to prevent the rehabilitating pipe 3 from floating up due to the buoyancy of the backfill material 4. Prior to the injection of the backfill material 4, a dedicated anti-floating device (not shown) may be installed in the rehabilitating pipe 3 separately from the existing pipe rehabilitating spacer device 10.

[0044] The backfill material 4 is allowed to harden over a period of one to several days after injection. As the backfill material 4 hardens, the existing pipe 1 and the rehabilitating pipe 3 are structurally integrated via the backfill material 4, and a composite pipe is constructed. In this way, the existing pipe 1 is rehabilitated. The rehabilitating pipe 3 may be a self-supporting pipe that has the required strength by itself.

[0045] Next, other embodiments of the present invention will be described. In the following embodiments, the same components as those already described will be denoted by the same reference numerals in the drawings, and the description will be simplified. <Second embodiment (FIG. 7)> As shown in FIG. 7(a), in the second embodiment of the present invention, the fastening holes of a spacer 11 of an existing pipe rehabilitation spacer device are configured as cross holes 40. As shown in FIG. 7(b), the cross holes 40 include a first elongated hole portion 41 extending in the longitudinal direction of the spacer 11 and a second elongated hole portion 42 extending in the width direction of the spacer 11. These first elongated hole portion 41 and second elongated hole portion 42 intersect at right angles at their centers. A cross hole 40 is formed at each end of the spacer 11 in the longitudinal direction. Preferably, multiple cross holes 40 are arranged at intervals in the longitudinal direction of the spacer 11.

[0046] According to the second embodiment, within a single fastening hole consisting of a cross hole 40, the position at which the anchoring member 22 is driven can be changed in two directions, the longitudinal direction (pipe axis direction) and the width direction (pipe circumferential direction) of the spacer 11. This allows the anchoring member 22 to be driven reliably into the existing pipe 1 by avoiding hard materials 1f such as reinforcing bars 1a and aggregates 1e (see Figure 4(a)).

[0047] 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 long axis of the engagement hole 32 consisting of the elongated holes 34, 35 may be oriented in the width direction of the spacer 11. The elongated holes 34, 35 each extending in the width direction of the spacer 11 may be arranged adjacent to each other but shifted from each other in the longitudinal direction or diagonal direction of the spacer 11. Each of the engaging holes may be circular. Two (or more) circular engaging holes may be arranged adjacent to each other at least in the width direction of the spacer 11, either in the longitudinal direction or the width direction. The engagement hole including the first elongated hole portion 41 and the second elongated hole portion 42 that intersect with each other in the second embodiment (FIG. 7) is not limited to the cross hole 40, but may be an H-shaped hole or a O-shaped hole. A combination of several embodiments may be used. For example, a single spacer 11 may include a combination of an attachment hole consisting of elongated holes 34 and 35 (FIG. 3) and a cross hole 40 or an attachment hole consisting of intersecting elongated hole portions 41 and 42 (FIG. 7). [Industrial Applicability]

[0048] The present invention is applicable to, for example, a technology for rehabilitating aged sewer pipes. [Explanation of symbols]

[0049] 1 Existing pipes 1a Reinforced concrete 1c Concrete 1e Aggregate 1f hard material 3 Rehabilitation pipe 2 Backfill space 4 Backfill material 10. Spacer device for rehabilitating existing pipes 11 Spacer 20 Anchoring means 21 Appearing parts 22 Fixing member 23 Leg (driven part) 24 Head (locking part) 30 Engagement portion 31a female screw hole 32 Attachment hole 34 Central slot 35 long hole 36 Mounting hole set 40 cross hole 41 1st long hole 42 2nd long hole

Claims

1. An existing pipe rehabilitation spacer device that is arranged between a rehabilitation pipe constructed in an existing pipe of reinforced concrete structure and the existing pipe, a spacer having a longitudinal direction oriented in the axial direction of the existing pipe; a retractable member that can retract from the spacer toward the existing pipe; a fixing member that is engaged with the spacer and fixed to the existing pipe; The spacer has a plurality of fastening holes formed therein, the fastening holes being adjacent to or extending in at least the width direction out of the width direction perpendicular to the length direction and the length direction, A spacer device for rehabilitating an existing pipe, characterized in that the fixing member is driven into the existing pipe through a selected one of the engagement holes.

2. The spacer has two adjacent long holes extending in one of the longitudinal and width directions as the attachment holes, and are arranged offset from each other in the other of the longitudinal and width directions.

3. 3. The spacer device for rehabilitating an existing pipe according to claim 2, wherein the two adjacent elongated holes are offset obliquely in a direction intersecting the extending direction of the other elongated hole.

4. A spacer device for rehabilitating existing pipes as described in claim 2, wherein one of the two adjacent long holes is positioned in the center of the width of the spacer, and the other long hole is positioned offset from the center of the width of the spacer.

5. 2. The spacer device for rehabilitating an existing pipe according to claim 1, wherein the engagement hole includes a first elongated hole portion extending in the longitudinal direction and a second elongated hole portion extending in the width direction and intersecting the first elongated hole portion.

6. A method for rehabilitating an existing pipe by constructing a rehabilitation pipe within the existing pipe using the existing pipe rehabilitation spacer device according to any one of claims 1 to 5, This is carried out prior to or in parallel with the construction of the rehabilitation pipe. a step of aligning the spacer along an inner peripheral surface of the existing pipe with a longitudinal direction of the spacer in a pipe axis direction of the existing pipe; a step of adjusting the amount of protrusion and retraction of the protrusion and retraction member; driving the anchoring member into the existing pipe through the selected fastening hole; Equipped with This method for rehabilitating an existing pipe is characterized in that, during the driving process, when a hard material within the existing pipe prevents the anchoring member from being driven to the required depth, the driving position of the anchoring member is changed to another nearby attachment hole or to a different position within the same attachment hole.

7. A method for rehabilitating an existing pipe as described in claim 6, wherein in the driving process, the first selected fastening hole is a fastening hole located in the center of the width of the spacer, or the first driving position is the center of the width of the spacer.

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