Divided reinforcement member, pipe lining structure comprising the same, and pipe lining method

Abstract

To provide a divided reinforcement member, a pipe lining structure including the same, and a pipe lining method, which can achieve strength equal to or greater than that of a pipe with reinforcing bars even in a pipe where sufficient strength cannot be expected.SOLUTION: A divided reinforcement member 11b comprises: an inner member 31 to which an internal surface member is attached on a surface opposite to the inner surface of an existing pipe P; an outer member 32 disposed between the inner surface of the existing pipe P and the inner member 31; and an inner-outer connecting member 33 that connects the inner member 31 and the outer member 32 in a direction orthogonal to the longitudinal direction of the existing pipe P.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a split reinforcing member used in a pipeline lining structure for reinforcing an existing pipeline, a pipeline lining structure including the split reinforcing member, and a pipeline lining method. [Background technology]

[0002] Patent Document 1 discloses a repair structure in which the inner surface of an existing pipeline, such as an aged water pipe, sewer pipe, or agricultural water pipe, is entirely covered with an inner surface member. In Patent Document 1, a plurality of inner surface members extending in the longitudinal direction are attached in a line in the circumferential direction to the inner periphery side of a hollow framework-like reinforcing body arranged along the inner surface of the existing pipeline. Then, a filling material is filled into the gap (backfilling space) between the inner surface of the existing pipeline and the inner surface members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-328430 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the repair structure of Patent Document 1 targets Hume pipes, which are reinforced concrete pipes with a circular cross section, and box culverts, which are reinforced concrete pipes with a rectangular cross section. However, there are cases where existing pipelines are used that lack strength, such as unreinforced concrete pipes that do not have reinforcing bars. In such cases, simply reinforcing the existing pipelines with the repair structure of Patent Document 1 will not be able to achieve strength equal to or greater than that of pipelines with reinforcing bars.

[0005] The object of the present invention is to provide a divided reinforcing member that can obtain strength equal to or greater than that of a pipeline equipped with reinforcing bars, even in a pipeline where strength is not expected to be sufficient, a lining structure for a pipeline equipped with the same, and a method for lining a pipeline. [Means for solving the problem]

[0006] The divided reinforcement member of the present invention is a divided reinforcement member that constitutes a reinforcement member used in a lining structure in which a backfilling space between an inner surface member arranged along the inner surface of a pipeline and the inner surface of the pipeline is filled with a filler, and the reinforcing members are arranged inside the pipeline in a row in the longitudinal direction of the pipeline, the multiple reinforcing members arranged in the longitudinal direction are connected in the longitudinal direction by a connecting member, the multiple reinforcing members connected in the longitudinal direction are arranged between the inner surface member and the inner surface of the pipeline, the reinforcing member is formed in a frame shape by combining the multiple divided reinforcement members, and the divided reinforcement member has an inner member to which the inner surface member is attached on a surface opposite to the inner surface of the pipeline, an outer member arranged between the inner surface of the pipeline and the inner member, and an inner and outer connecting member that connects the inner member and the outer member in a direction perpendicular to the longitudinal direction.

[0007] In addition, the lining structure of the pipeline of the present invention comprises reinforcing members arranged in a row inside the pipeline in the longitudinal direction, a connecting member that connects the reinforcing members arranged in a row in the longitudinal direction in the longitudinal direction, an inner surface member that is attached to the surface of the reinforcing member opposite the inner surface of the pipeline, and a filling material that fills the backfilling space between the inner surface of the pipeline and the inner surface member, and the reinforcing member is formed in a frame shape by combining a plurality of divided reinforcing members, and the divided reinforcing member comprises an inner member to which the inner surface member is attached on the surface opposite the inner surface of the pipeline, an outer member that is arranged between the inner surface of the pipeline and the inner member, and an inner and outer connecting member that connects the inner member and the outer member in a direction perpendicular to the longitudinal direction.

[0008] The present invention also provides a method for lining a pipeline, the method comprising the steps of: arranging a plurality of reinforcing members in a line along the longitudinal direction of the pipeline inside the pipeline; connecting the reinforcing members arranged in the longitudinal direction in the longitudinal direction with a connecting member; attaching an inner surface member to the reinforcing member on a surface opposite to the inner surface of the pipeline; and filling a backfilling space between the inner surface of the pipeline and the inner surface member with a filler. The reinforcing member is formed into a frame shape by combining a plurality of divided reinforcing members, the divided reinforcing member comprising an inner member to which the inner surface member is attached on a surface opposite to the inner surface of the pipeline, an outer member arranged between the inner surface of the pipeline and the inner member, an inner / outer connecting member connecting the inner member and the outer member in a direction perpendicular to the longitudinal direction, and a support portion provided between the inner member and the outer member, and the method further comprises the steps of supporting a distribution bar extending in the longitudinal direction with the support portion after the connecting step. Effect of the Invention

[0009] According to the present invention, the inner member to which the inner member is attached and the outer member disposed between the inner surface of the pipeline and the inner member are connected by an inner / outer connecting member. By disposing the outer member on the outside of the inner member, the outer member can play a role equivalent to that of a reinforcing bar in a pipeline equipped with reinforcing bars. Therefore, even in a pipeline that is not expected to be strong, such as a pipeline without reinforcing bars, by disposing a reinforcing member inside the pipeline and constructing a lining structure, it is possible to obtain strength equivalent to or greater than that of a pipeline equipped with reinforcing bars with the lining structure alone. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a structural explanatory diagram of the lining structure in a state in which the self-hardening filler is omitted, and shows the existing pipeline and the lining structure cut in a vertical cross section along their longitudinal direction. [Diagram 2] 2 is a cross-sectional view taken along line AA in FIG. 1. [Diagram 3] FIG. 3 is an enlarged view of part B in FIG. [Figure 4]1 is a cross-sectional view taken along the longitudinal direction of an existing pipeline, illustrating a state in which only the pipeline reinforcement material is disposed along the inner surface of the existing pipeline, for explaining the pipeline reinforcement material. FIG. [Diagram 5] 4 is a front view of a split reinforcing member that constitutes the reinforcing member. FIG. [Figure 6] FIG. 1 is a cross-sectional view of a reinforced concrete pipe with reinforcing bars and a lining. [Figure 7] FIG. 2 is a cross-sectional view of a plain concrete pipe and lining structure without rebar. [Figure 8] FIG. 6 is an enlarged view of part C in FIG. 5. [Figure 9] 13 is a front view of a split reinforcing member constituting a reinforcing member of a modified example. FIG. [Figure 10] FIG. 10 is an enlarged view of part D in FIG. [Figure 11] FIG. 13 is a diagram showing the external pressure test. [Figure 12] 4 is a cross-sectional view of an existing pipeline showing a state before an inner surface member is disposed along the inner surface of the existing pipeline. FIG. [Figure 13] FIG. 2 is a cross-sectional view of an existing pipeline showing the completed state of lining of the existing pipeline. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A pipeline lining structure using a divided reinforcing member according to one embodiment of the present invention will be described below with reference to the drawings. The pipeline lining structure according to the present invention is a lining structure suitable for covering and reinforcing the inner surface of existing pipelines such as aged water pipes, sewer pipes, or agricultural water pipes, but is also a technology that can be applied when covering the inner surface (secondary lining) of these newly constructed pipelines.

[0012] (Interior structure configuration) Fig. 1 is a structural explanatory diagram of a lining structure 100 according to the present invention, in which an existing pipeline P and the lining structure 100 are shown cut in a vertical section along the longitudinal direction. Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. Fig. 3 is an enlarged view of part B in Fig. 2. As will be described later, the backfilling filling space S is filled with a self-hardening filler 99 to construct the lining structure 100 in the existing pipeline P (see Fig. 13), but Figs. 1 to 3 show the state before the self-hardening filler 99 is filled.

[0013] As shown in Figs. 1 to 3, the lining structure 100 is configured in a tubular shape that fits along the inner surface of an existing pipeline P. The lining structure 100 has a pipeline reinforcement material 1, a fitting member 4, and an inner surface member 2. The pipeline reinforcement material 1 is in the form of a hollow framework, and is disposed along the inner surface of the existing pipeline P. A plurality of fitting members 4 are disposed on the inner periphery side of the pipeline reinforcement material 1. The inner surface member 2 is attached to the pipeline reinforcement material 1 via the plurality of fitting members 4.

[0014] Here, the existing pipeline (pipe) P in this embodiment is a plain concrete pipe that does not have reinforcing bars. The cross-sectional shape of the existing pipeline P in this embodiment is circular. Note that the existing pipeline P may be a covered pipe or a masonry pipe with a rectangular cross-sectional shape. The existing pipeline P may be a reinforced concrete pipe with reinforcing bars. The reinforced concrete pipe may be a Hume pipe with a circular cross-sectional shape or a box culvert with a rectangular cross-sectional shape.

[0015] (Pipe reinforcement material) FIG. 4 is a cross-sectional view along the longitudinal direction of the existing pipeline P, illustrating a state in which only the pipeline reinforcement material 1 is disposed along the inner surface of the existing pipeline P, for explaining the pipeline reinforcement material 1. As shown in FIGS. 2 and 4, the pipeline reinforcement material 1 has a reinforcing member 11 and a connecting member 12. The reinforcing member 11 is ring-shaped (frame-shaped), and a plurality of reinforcing members 11 are arranged inside the existing pipeline P at predetermined intervals in the longitudinal direction of the existing pipeline P. As shown in FIG. 3, a plurality of fitting portions 11a into which the fitting member 4 is fitted are formed at equal intervals in the circumferential direction of the existing pipeline P on the inner peripheral side of the reinforcing member 11.

[0016] In this embodiment, the reinforcing member 11 is formed in a ring shape by combining arc-shaped divided reinforcing members that are divided into four pieces in the circumferential direction, but this is not limited to this, and the reinforcing member 11 may be divided into a number of pieces other than four in the circumferential direction, and may also be divided into pieces of uneven lengths in the circumferential direction.

[0017] The material of the reinforcing member 11 is preferably steel from the standpoint of cost and strength, but is not particularly limited, and may be carbon steel, stainless steel, FRP, etc. The thickness of the reinforcing member 11 is, for example, 6 mm.

[0018] As shown in Fig. 4, a plurality of connecting members 12 longitudinally connect the reinforcing members 11 arranged in the longitudinal direction of the existing pipeline P. By connecting the reinforcing members 11 to each other with a plurality of connecting members 12, the pipeline reinforcement material 1 is formed into a hollow cylindrical shape. As shown in Fig. 2, the reinforcing member 11 is disposed between the inner surface member 2 and the inner surface of the existing pipeline P.

[0019] As shown in Fig. 4, the connecting member 12 has a pipe member 12c, a connecting bolt 12a, and a nut 12b. The pipe member 12c is disposed between two adjacent reinforcing members 11 in the longitudinal direction of the existing pipeline P, and serves as a spacer. Male threads are formed on both ends of the connecting bolt 12a. The nuts 12b are screwed into the male threads of the connecting bolt 12a.

[0020] The connecting bolt 12a is inserted into the pipe material 12c interposed between the two adjacent reinforcing members 11, and the nuts 12b are screwed into the male threads at both ends of the connecting bolt 12a, so that the connecting member 12 connects and integrates the two adjacent reinforcing members 11 with each other. Here, even if the existing pipeline P has bends or steps, it is possible to deal with them by appropriately changing the length of the pipe material 12c and the connecting bolt 12a in the circumferential direction. Also, instead of the pipe material 12c, the connecting bolt 12a with the nuts 12b screwed in advance to the center at both ends may be used as a spacer, and the reinforcing member 11 may be connected and integrated by sandwiching it between the other nuts 12b. In addition, an unhardened self-hardening filler 99 is injected into the gap (backfilling space S) between the reinforcing member 11 and the existing pipeline P at the final stage of construction, as described later.

[0021] Fig. 5 is a front view of a divided reinforcing member 11b constituting the reinforcing member 11. As shown in Fig. 5, the divided reinforcing member 11b has an inner member 31, an outer member 32, and an inner / outer connecting member 33. A plurality of fitting portions 11a for fitting the fitting members 4 are formed on the surface of the inner member 31 opposite to the inner surface of the existing pipeline P (the lower surface in the figure). The inner surface member 2 is attached to the surface of the inner member 31 opposite to the inner surface of the existing pipeline P via the fitting members 4.

[0022] As shown in Fig. 3, the outer member 32 is disposed between the inner surface of the existing pipeline P and the inner member 31. In this embodiment, only one outer member 32 is provided between the inner surface of the existing pipeline P and the inner member 31. As shown in Fig. 5, the inner / outer connecting member 33 connects the inner member 31 and the outer member 32 in the radial direction (direction perpendicular to the longitudinal direction) of the existing pipeline P. A plurality of inner / outer connecting members 33 are provided in the circumferential direction of the divided reinforcing member 11b. A gap is formed between the inner member 31 and the outer member 32.

[0023] In this embodiment, the inner member 31, the outer member 32, and the inner / outer connecting member 33 are integrally formed, but they may be formed separately and the inner member 31 and the outer member 32 are connected by the inner / outer connecting member 33. If these are separate, it is necessary to align the inner member 31 and the outer member 32 when connecting the inner member 31 and the outer member 32 with the inner / outer connecting member 33. On the other hand, if these are integral, such alignment is not necessary and handling is also easier.

[0024] 6 is a cross-sectional view of a reinforced concrete pipe 50 with reinforcing bars 51 and a lining structure 200. Reinforcing bars 51 are arranged in a spiral shape inside a reinforced concrete pipe 50 such as a Hume pipe. Therefore, the reinforced concrete pipe 50 has a higher strength than a non-reinforced concrete pipe that does not have reinforcing bars 51. Therefore, the reinforcing member 211 of the lining structure 200 used for the reinforced concrete pipe 50 is only the inner member 221, and there is no problem in terms of strength even if there is no outer member on the outside of the inner member 221.

[0025] 7 is a cross-sectional view of an unreinforced concrete pipe 60 without reinforcing bars and a lining structure 100. Unlike the reinforced concrete pipe 50, the unreinforced concrete pipe 60 does not have reinforcing bars 51 provided inside. Therefore, the unreinforced concrete pipe 60 has a lower strength than the reinforced concrete pipe 50 with reinforcing bars 51. Therefore, the reinforcing member 11 of the lining structure 100 of this embodiment used for the unreinforced concrete pipe 60 has an outer member 32 on the outside of the inner member 31.

[0026] By disposing the outer member 32 on the outside of the inner member 31, the outer member 32 can play a role equivalent to that of the reinforcing bars 51 of the reinforced concrete pipe 50 having the reinforcing bars 51. Therefore, even in the case of an existing pipeline P that is not expected to have sufficient strength, such as an unreinforced concrete pipe 60 that does not have the reinforcing bars 51, by disposing the reinforcing member 11 inside the existing pipeline P and constructing the lining structure 100, it is possible to obtain a strength equivalent to or greater than that of the reinforced concrete pipe 50 having the reinforcing bars 51 with the lining structure 100 alone.

[0027] Here, since there is a gap between the inner member 31 and the outer member 32, the self-hardening filler 99 can be suitably spread throughout the backfilling space S.

[0028] 3, only one outer member 32 is provided between the inner surface of the existing pipeline P and the inner member 31. Even if multiple outer members 32 are provided between the inner surface of the existing pipeline P and the inner member 31, only the outermost outer member 32 functions sufficiently as a tensile member. Therefore, by providing only one outer member 32 between the inner surface of the existing pipeline P and the inner member 31, the strength of the existing pipeline P can be improved with a simple configuration.

[0029] Here, instead of forming the divided reinforcing member 11b (reinforcing member 11) as a double structure of an inner member 31 and an outer member 32, it is possible to use only the inner member 31 and widen the width of the inner member 31 in the radial direction of the existing pipeline P so that the outer periphery of the inner member 31 is located at the position of the outer periphery of the outer member 32. However, in this case, since the inner member 31 has no gap through which the self-hardening filler 99 can flow, the self-hardening filler 99 on both the inside and outside of the reinforcing member 11 (inner member 31) is divided by the reinforcing member 11 in the longitudinal direction of the existing pipeline P. In this structure, since the self-hardening filler 99 on both sides of the reinforcing member 11 (inner member 31) are not connected to each other, it may be difficult to obtain the reinforcing effect of the lining structure 100. Therefore, it is preferable that the divided reinforcement member 11b has a double structure consisting of an inner member 31 and an outer member 32, and the self-hardening filler 99 on both sides of the reinforcement member 11 in the longitudinal direction of the existing pipeline P is connected through the gap between the inner member 31 and the outer member 32.

[0030] Note that a member consisting only of the outer member 32 may be disposed between the reinforcing members 11 in the longitudinal direction of the existing pipeline P. The outer member 32 plays the role of the reinforcing bars 51 in a pipeline (such as a reinforced concrete pipe 50) equipped with reinforcing bars 51, so that the greater the number of outer members 32, the more the strength of the existing pipeline P can be improved.

[0031] Fig. 8 is an enlarged view of part C in Fig. 5. The lining structure 100 has distribution bars 7. The distribution bars 7 extend in the longitudinal direction of the existing pipeline P (the direction perpendicular to the page). The distribution bars 7 are, for example, deformed steel bars. In the longitudinal direction of the existing pipeline P, it is desirable that the cross-sectional area of ​​the distribution bars 7 is 1 / 6 or more of the cross-sectional area of ​​the reinforcing member 11. It is also desirable that eight or more distribution bars 7 are provided in the circumferential direction of the reinforcing member 11. In this embodiment, as shown in Fig. 2, twelve distribution bars 7 are provided in the circumferential direction of the reinforcing member 11.

[0032] As shown in FIG. 8, the divided reinforcing member 11b has a support portion 34. The support portion 34 is provided between the inner member 31 and the outer member 32. The support portion 34 is provided on the outer member 32 side of the inner member 31 and on the inner member 31 side of the outer member 32. The support portion 34 supports the reinforcing bars 7. The support portion 34 has a recess into which the reinforcing bars 7 are fitted. In FIG. 8, the reinforcing bars 7 are fitted into the recess of the support portion 34 provided on the inner member 31 side of the outer member 32. The reinforcing bars 7 are fixed to the outer member 32 by wires 37 looped between the outer member 32 and the reinforcing bars 7. The reinforcing bars 7 are supported in the same manner by the support portion 34 provided on the outer member 32 side of the inner member 31.

[0033] The stress applied to the existing pipeline P in the radial direction of the existing pipeline P is transmitted from the reinforcing bars 7 to the self-hardening filler 99. This makes it possible to disperse the stress applied to the existing pipeline P at least in the longitudinal direction of the existing pipeline P. This makes it possible to improve the strength of the existing pipeline P.

[0034] 2, in this embodiment, the reinforcing bars 7 are alternately arranged in the support parts 34 of the inner member 31 on the outer member 32 side and the support parts 34 of the outer member 32 on the inner member 31 side along the circumferential direction of the existing pipeline P. This makes it possible to transmit the stress acting on the existing pipeline P in the radial direction of the existing pipeline P to both the inner member 31 and the outer member 32, compared to the case where the reinforcing bars 7 are arranged only in the support parts 34 of the inner member 31 on the outer member 32 side or the case where the reinforcing bars 7 are arranged only in the support parts 34 of the outer member 32 on the inner member 31 side. Therefore, the stress acting on the existing pipeline P can be suitably distributed.

[0035] Fig. 9 is a front view of a divided reinforcing member 111b constituting a reinforcing member 111 of a modified example. Fig. 10 is an enlarged view of part D in Fig. 9. In this modified example, as shown in Fig. 10, the support portion 34 is formed in the inner / outer connecting member 33. Specifically, a convex portion 35 protrudes in the circumferential direction of the existing pipeline P from the center of the inner / outer connecting member 33 in the radial direction of the existing pipeline P. The gap between the convex portion 35 and the inner member 31 and the gap between the convex portion 35 and the outer member 32 each serve as the support portion 34. Even with this configuration, the reinforcing bars 7 can be disposed in the support portion 34 of the inner member 31 on the outer member 32 side and the support portion 34 of the outer member 32 on the inner member 31 side.

[0036] Here, the test results of the external pressure test of the lining structure 100 will be described. The external pressure test is shown in Fig. 11. As shown in Fig. 11, the external pressure test was performed by applying a downward load to the upper end of the lining structure 100. The strength of the lining structure 100 was evaluated by comparing the maximum experimental load value [kN / m] that the lining structure 100 could withstand with the standard value [kN / m] of a Hume pipe (reinforced concrete pipe).

[0037] Here, a lining structure 100 was constructed inside a steel cylindrical body, and then removed from the steel cylindrical body, and only the lining structure 100 was used as a test specimen.

[0038] The maximum load experimental value of the test specimen was 1.5 times or more the standard value of the Hume pipe. This shows that the lining structure 100 using the reinforcing member 11 of this embodiment has a higher strength than the Hume pipe.

[0039] (Fitting parts) 2 and 3, a plurality of fitting members 4 are attached parallel to one another along the longitudinal direction of the existing pipeline P on the inner peripheral side of the pipeline reinforcement 1 (reinforcing member 11). As shown in Fig. 3, the fitting members 4 are molded bodies having a uniform cross-sectional shape that is an angular C-shape that is almost the same as the fitting portion 11a of the reinforcing member 11 described above. The length of the fitting members 4 in the longitudinal direction is a fixed length, for example, about 5 m.

[0040] The fitting members 4 are attached to the pipeline reinforcement 1 by fitting the fitting members 4 into each fitting portion 11a of the reinforcement members 11 provided in the longitudinal direction of the existing pipeline P, with the opening of the fitting member 4 facing the center side of the existing pipeline P (i.e., the radially inward direction of the existing pipeline P). The fitting members 4, each having a certain length, are connected in multiple pieces in the longitudinal direction of the existing pipeline P to cover the repair length. That is, the multiple fitting members 4 are connected by a connecting member (not shown) with adjacent end faces in the longitudinal direction abutting against each other, so that the overall length of the fitting members 4 corresponds to the repair length of the existing pipeline P, and the entire fitting members are attached to the pipeline reinforcement 1.

[0041] As shown in Figure 3, two mounting portions 21 adjacent to each other in the circumferential direction of the existing pipeline P of the inner surface member 2 adjacent to each other in the circumferential direction of the existing pipeline P are integrally fitted into the fitting member 4 toward the inner surface side of the existing pipeline P (the radially outer side of the existing pipeline P) (the upper side in the figure).

[0042] The material of the fitting member 4 is preferably an olefin-based thermoplastic resin such as polyethylene resin, which has excellent corrosion resistance, is lightweight, is easy to install, and is inexpensive, but it can also be a thermosetting resin such as unsaturated polyester resin, a fiber-reinforced plastic with higher strength, a flame-retardant thermoplastic resin, or a metal such as stainless steel.

[0043] (Inner surface material) 2 and 3, the inner surface member 2 is attached to the pipeline reinforcement member 1 (reinforcement member 11) via a plurality of fitting members 4 attached in the longitudinal and circumferential directions of the existing pipeline P on the inner periphery side of the pipeline reinforcement member 1. A plurality of the inner surface members 2 are provided adjacent to each other in the circumferential direction of the existing pipeline P.

[0044] The inner surface member 2 has a fixed length, for example, a length of about 5 m, along the longitudinal direction of the existing pipeline P. Furthermore, a plurality of the inner surface members 2 having a fixed length are connected in the longitudinal direction of the existing pipeline P to cover the repair length. That is, the plurality of inner surface members 2 are connected by an inner surface member connecting member (not shown) with adjacent end faces in the longitudinal direction abutting each other, so that the length as a whole corresponds to the repair length of the existing pipeline P, and the entirety is attached to the pipeline reinforcement member 1 via the fitting member 4.

[0045] As shown in Fig. 3, the inner surface member 2 has a uniform cross-sectional shape that is symmetrical on the left and right sides. As shown in Fig. 3, the inner surface member 2 has a side wall portion 22 and an attachment portion 21. The side wall portion 22 covers the inner surface of the existing pipeline P along the longitudinal direction of the existing pipeline P.

[0046] The mounting portions 21 are provided at both ends of the side wall portion 22 in the circumferential direction of the existing pipeline P. The two mounting portions 21 each protrude toward the inner surface side of the existing pipeline P (the radial outer side of the existing pipeline P) (the upper side in the figure). The mounting portions 21 are formed continuously along the longitudinal direction of the inner surface member 2.

[0047] 3, the mounting portion 21 has a protruding portion 21a and an inclined portion 21b. The protruding portion 21a protrudes from a circumferential end of the side wall portion 22 toward the radial inner surface of the existing pipeline P. The inclined portion 21b extends from the tip of the protruding portion 21a at an angle so as to approach the side wall portion 22.

[0048] 3, the mounting portions 21 of the two inner surface members 2 (edges along the longitudinal direction of the inner surface members 2, i.e., one end portion in the circumferential direction of the existing pipeline P of one inner surface member 2 and the other end portion in the circumferential direction of the existing pipeline P of the other inner surface member 2 adjacent to the one inner surface member 2) are paired together, and the inner surface members 2 are inserted into the opening of the fitting member 4, whereby the tips of the inclined portions 21b of the mounting portions 21 are locked into the opening of the fitting member 4. In this way, the inner surface members 2 are securely held to the pipeline reinforcement material 1 via the fitting member 4.

[0049] The material of this inner surface member 2 is preferably an olefin-based thermoplastic resin such as polyethylene resin, which is highly corrosion-resistant, lightweight, easy to install, and inexpensive, like the above-mentioned fitting member 4, but it can also be a thermosetting resin such as unsaturated polyester resin, a fiber-reinforced plastic with higher strength, a flame-retardant thermoplastic resin, or a metal such as stainless steel. The material of the inner surface member 2 is preferably the same as that of the fitting member 4.

[0050] (Sealing material) 3, a sealant 5 made of, for example, a thermoplastic elastomer, synthetic rubber, water-swelling rubber, or the like is disposed between each fitting member 4 and the mutually abutting mounting portions 21 of the two inner surface members 2 attached to each fitting member 4. This makes it possible to obtain watertightness between the inner surface members 2 adjacent in the circumferential direction of the existing pipeline P.

[0051] (End fixing member) An end fixing member may be disposed in the backfilling space S between the inner surface member 2 and the inner surface of the existing pipeline P. The end fixing member is disposed, for example, in the vicinity of the pipe mouth of the lining structure 100, i.e., at the longitudinal end of the inner surface member 2. Furthermore, multiple end fixing members are provided along the circumferential direction of the existing pipeline P. The end fixing member prevents the inner surface member 2 from coming off the pipeline reinforcement material 1 (reinforcement member 11).

[0052] (Laying method of lining structure) Next, a method for laying the lining structure 100 inside an existing pipeline P will be described. Fig. 12 is a cross-sectional view of the existing pipeline P showing a state before the inner surface member 2 is disposed along the inner surface of the existing pipeline P. Fig. 13 is a cross-sectional view of the existing pipeline P showing a state after lining of the existing pipeline P is completed.

[0053] First, in the construction, a weir (not shown) is installed on the upstream side of the existing pipeline P. Alternatively, a bypass is installed to change the water, and an environment in which people can work in the existing pipeline P is created. Then, the pipeline reinforcement material 1 is arranged along the inner surface of the existing pipeline P. The reinforcing members 11 constituting the pipeline reinforcement material 1 are usually formed by assembling divided reinforcing members 11b (see FIG. 5) divided into a plurality of parts inside the existing pipeline P. Then, the reinforcing members 11, in which some or all of the members are assembled, are arranged in a line in the longitudinal direction of the existing pipeline P (arrangement process). Then, the reinforcing members 11 arranged in the longitudinal direction are connected in the longitudinal direction by the connecting members 12 to obtain a cylindrical pipeline reinforcement material 1 (connection process). Then, the reinforcing members 7 are supported by the support parts 34 (support process) (see FIG. 3).

[0054] After the assembly of the pipeline reinforcement member 1 is completed, the fitting members 4 are fitted into the fitting portions 11a of the reinforcing members 11 constituting the pipeline reinforcement member 1. The state in which the fitting members 4 are fitted into the reinforcing members 11 is shown in a cross-sectional view in FIG. 12. Next, the inner surface member 2 is fitted into the fitting members 4 in a pair (attachment process). The state in which the inner surface member 2 is fitted into the fitting members 4 is shown in cross-sectional views in FIGS. 1 and 2. Note that in this embodiment, it is not necessarily necessary to use the fitting members 4, and the inner surface member 2 may be attached directly to the reinforcing members 11 constituting the pipeline reinforcement member 1 by fitting.

[0055] Next, multiple end fixing members are placed in the backfilling space S. Next, the ends of the fitting members 4 and the ends of the inner surface members 2 in the longitudinal direction of the existing pipeline P are trimmed to be even. After this, the vicinity of the pipe opening is checked for foreign matter and cleaned. Then, the vicinity of the pipe opening is filled with acid-resistant mortar. At this time, a gable formwork may be used instead of the acid-resistant mortar.

[0056] Thereafter, as shown in Figs. 1 and 2, a self-hardening filler 99 is injected between the inner surface member 2 and the existing pipeline P and hardened between them (filling process). The final structure after the self-hardening filler 99 is injected is shown in a cross-sectional view in Fig. 13. As the self-hardening filler 99, for example, cement-based materials such as cement milk, mortar, concrete, or thermosetting resins such as unsaturated polyester resin and epoxy resin can be used, and the material is appropriately selected depending on the required performance and cost. When injecting the self-hardening filler 99, a gable formwork or the like may be installed at the end of the existing pipeline P and the filler may be injected, or an injection port may be provided in the inner surface member 2 and the filler may be injected.

[0057] Then, the pipe opening is finished and treated with acid-resistant mortar, as shown in Fig. 1. In this manner, construction of the lining structure 100 in the existing pipeline P is completed.

[0058] (effect) As described above, according to the reinforcing member 11 and the lining structure 100 composed of the divided reinforcing member 11b according to this embodiment, as shown in FIG. 5, the inner member 31 to which the inner member 2 is attached and the outer member 32 arranged between the inner surface of the existing pipeline P and the inner member 31 are connected by the inner / outer connecting member 33. By arranging the outer member 32 on the outside of the inner member 31, the outer member 32 can play a role equivalent to that of the reinforcing bar 51 in a pipeline (such as a reinforced concrete pipe 50) equipped with the reinforcing bar 51. Therefore, even in the case of an existing pipeline P in which strength cannot be expected, such as an unreinforced concrete pipe 60 not equipped with the reinforcing bar 51, by arranging the reinforcing member 11 inside the existing pipeline P and constructing the lining structure 100, it is possible to obtain a strength equivalent to or greater than that of a pipeline equipped with the reinforcing bar 51 with only the lining structure 100. Furthermore, by connecting the inner member 31 and the outer member 32 with a gap between them by the inner and outer connecting members 33, a gap through which the self-hardening filler 99 can flow can be formed between the inner member 31 and the outer member 32. This allows the self-hardening filler 99 to be distributed appropriately.

[0059] 3, only one outer member 32 is provided between the inner surface of the existing pipeline P and the inner member 31. Even if multiple outer members 32 are provided between the inner surface of the existing pipeline P and the inner member 31, only the outermost outer member 32 functions sufficiently as a tensile member. Therefore, by providing only one outer member 32 between the inner surface of the existing pipeline P and the inner member 31, the strength of the existing pipeline P can be improved with a simple configuration.

[0060] 8, the reinforcing bars 7 extending in the longitudinal direction of the existing pipeline P are correctly supported at predetermined positions by the support parts 34 provided between the inner member 31 and the outer member 32. Stress applied to the existing pipeline P in the radial direction of the existing pipeline P is transmitted from the reinforcing bars 7 to the self-hardening filler material 99. This makes it possible to distribute the stress applied to the existing pipeline P at least in the longitudinal direction of the existing pipeline P. This makes it possible to improve the strength of the existing pipeline P.

[0061] As shown in FIG. 8, the support portion 34 is provided on the outer member 32 side of the inner member 31 and the inner member 31 side of the outer member 32. Therefore, the reinforcing bars 7 can be arranged on the outer member 32 side of the inner member 31 and the inner member 31 side of the outer member 32. For example, the reinforcing bars 7 can be arranged alternately on the outer member 32 side of the inner member 31 and the inner member 31 side of the outer member 32 along the circumferential direction of the existing pipeline P. In this case, the stress applied to the existing pipeline P in the radial direction of the existing pipeline P can be transmitted to both the inner member 31 and the outer member 32, compared to the case where the reinforcing bars 7 are arranged only on the outer member 32 side of the inner member 31 or the case where the reinforcing bars 7 are arranged only on the inner member 31 side of the outer member 32. Therefore, in this case, the stress applied to the existing pipeline P can be suitably distributed.

[0062] Although the embodiments of the present invention have been described above, they are merely illustrative examples and do not limit the present invention, and the specific configurations and the like can be appropriately modified in design. Furthermore, the actions and effects described in the embodiments of the invention are merely a list of the most preferable actions and effects resulting from the present invention, and the actions and effects of the present invention are not limited to those described in the embodiments of the present invention. [Explanation of symbols]

[0063] 1 Pipe reinforcement materials 2 Inner surface material 4 Fittings 5. Sealing material 7. Distribution Reinforcement 11 Reinforcement members 11a Mating part 11b Split reinforcement member 12 Connecting members 21 Mounting part 22 Side wall 31 Inner member 32 Outer member 33 Internal and external connecting members 34 Support part 35 Convex 37 Wire 50 Reinforced concrete pipe 51 Reinforcement Bar 60 Plain concrete pipe 99 Self-curing filler 100 Lining structure 111 Reinforcement member 111b Split reinforcement member 200 Lining structure 211 Reinforcement members 221 Inner member

Claims

1. A divided reinforcing member constituting a reinforcing member used in a lining structure in which a filler is filled in a backfilling space between an inner surface member arranged along an inner surface of a pipeline and the inner surface of the pipeline, The reinforcing member is arranged in a plurality of pieces in the longitudinal direction of the pipeline inside the pipeline, The reinforcing members arranged in the longitudinal direction are connected in the longitudinal direction by a connecting member, the plurality of reinforcing members connected in the longitudinal direction are disposed between the inner surface member and the inner surface of the pipeline, The reinforcing member is formed into a frame shape by combining a plurality of the divided reinforcing members, The split reinforcing member is an inner member to which the inner surface member is attached on a surface of the pipeline opposite to the inner surface; an outer member disposed between the inner surface of the conduit and the inner member; an inner / outer connecting member that connects the inner member and the outer member in a direction perpendicular to the longitudinal direction; A divided reinforcing member comprising:

2. 2. The split reinforcing member according to claim 1, wherein only one outer member is provided between the inner surface of the pipeline and the inner member.

3. A support portion is provided between the inner member and the outer member, The split reinforcement member according to claim 1 or 2, wherein the support portion supports a reinforcing bar extending in the longitudinal direction.

4. 4. The split reinforcing member according to claim 3, wherein the support portion is provided on the inner member on a side facing the outer member and on the outer member on a side facing the inner member.

5. A plurality of reinforcing members are arranged in the longitudinal direction of the pipeline inside the pipeline; a connecting member that connects the reinforcing members arranged in the longitudinal direction, the reinforcing members being arranged in the longitudinal direction; an inner surface member attached to a surface of the reinforcing member opposite to the inner surface of the pipeline; A filler material is filled in a backfilling space between the inner surface of the pipeline and the inner surface member; having The reinforcing member is formed into a frame shape by combining a plurality of divided reinforcing members, The split reinforcing member is an inner member to which the inner surface member is attached on a surface of the pipeline opposite to the inner surface; an outer member disposed between the inner surface of the conduit and the inner member; an inner / outer connecting member that connects the inner member and the outer member in a direction perpendicular to the longitudinal direction; A pipeline lining structure comprising:

6. A reinforcing bar extending in the longitudinal direction is provided.

6. The pipeline lining structure according to claim 5, wherein the reinforcing member has a support portion provided between the inner member and the outer member and supporting the reinforcing bar.

7. A placement step of arranging a plurality of reinforcing members in a longitudinal direction of the pipeline inside the pipeline; a connecting step of connecting a plurality of the reinforcing members arranged in the longitudinal direction with a connecting member in the longitudinal direction; an attachment step of attaching an inner surface member to a surface of the reinforcing member opposite to the inner surface of the pipeline; a filling step of filling a backfilling space between the inner surface of the pipeline and the inner surface member with a filler; A method for lining a pipeline comprising: The reinforcing member is formed into a frame shape by combining a plurality of divided reinforcing members, The divided reinforcing member is an inner member to which the inner surface member is attached on a surface of the pipeline opposite to the inner surface; an outer member disposed between the inner surface of the conduit and the inner member; an inner / outer connecting member that connects the inner member and the outer member in a direction perpendicular to the longitudinal direction; A support portion provided between the inner member and the outer member; having A method for lining a pipeline, comprising, after the connecting step, a supporting step of supporting the reinforcing bars extending in the longitudinal direction with the supporting portions.

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