Installation method for earthquake-resistant flexible joints

Abstract

To propose a construction method for earthquake-resistant flexible joints and a method for repairing concrete members that can save materials and reduce working time. [Solution] The construction method S100 for seismic-resistant flexible joints includes: a deterioration confirmation step S3 in which deteriorated parts are confirmed by tapping the concrete areas along both sides of the joint between concrete members; a filler filling step S5 in which a photocurable filler 26 is filled into the recess where the concrete of the deteriorated part has been removed and made flat; a light irradiation step S6 in which the photocurable filler is cured by irradiating it with light of a wavelength that hardens the flattened photocurable filler; and an expansion member fixing step SA in which an expansion member 21 that covers the joint is fixed via anchor bolts 23, wherein the expansion member is fixed in a state in which part or all of it is in contact with the surface of the photocurable filler.

Description

Technical Field

[0001] The present invention relates to a construction method for a seismic flexible joint disposed at a joint portion of concrete members and a concrete member repair method.

Background Art

[0002] Conventionally, in a water channel tunnel formed of concrete, when reinforcing a joint portion connecting each concrete member constituting the water channel tunnel, it is known to apply a seismic flexible joint (see Non-Patent Document 1). The construction method of this seismic flexible joint is to cut (chisel) the deteriorated concrete surface in the left and right regions of the joint to a predetermined range and a predetermined depth, apply mortar to the recessed region by cutting, and perform curing. Then, the construction method of the seismic flexible joint secures the seismic performance and waterstop performance of the joint portion by fixing the seismic flexible joint formed of a rubber sheet to the region made flat by mortar with an anchor. Also, for concrete members other than the water channel in use, a repair method of filling the deteriorated portion with mortar is adopted.

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the construction methods for earthquake-resistant flexible joints in concrete members and in concrete repair methods, mortar is used when repairing deteriorated areas, requiring a curing time of 3 to 7 days for the mortar to dry. On the other hand, in the construction methods for earthquake-resistant flexible joints to reinforce joints and in repair work on existing concrete structures, there is a demand to complete the work in a short time. Furthermore, there is a demand to conserve materials related to the repair process.

[0005] The present invention aims to address the aforementioned needs by proposing a method for constructing a seismic-resistant flexible joint and a method for repairing concrete members that can save materials and shorten working time. [Means for solving the problem]

[0006] A method for constructing an earthquake-resistant flexible joint according to the present invention to solve the aforementioned problems includes: a deterioration confirmation step to confirm deteriorated parts by tapping concrete areas along both sides of a joint between concrete members; a filler filling step to fill the recessed area where the concrete of the deteriorated part has been removed with a photocurable filler and make it flat; a light irradiation step to cure the photocurable filler by irradiating it with light of a wavelength that hardens the flattened photocurable filler; and an expansion member fixing step to fix an expansion member that covers the joint via anchor bolts, wherein the expansion member is fixed in a state in which part or all of it is in contact with the surface of the photocurable filler.

[0007] Furthermore, the construction method for the earthquake-resistant flexible joint according to the present invention comprises a cutting step of cutting a predetermined range including the deteriorated portion in the concrete area along both sides of the joint between concrete members to form a recess, and a filling step of filling the recess with a light-curing filler to make it flat, A method for constructing an earthquake-resistant flexible joint, comprising: a light irradiation step of curing the photocurable filler by irradiating it with light of a wavelength that hardens the flattened photocurable filler; and an expansion member fixing step of fixing an expansion member that covers the joint via anchor bolts, wherein the expansion member is fixed in a state in which part or all of it is in contact with the surface of the photocurable filler.

[0008] Furthermore, the concrete member repair method of the present invention includes a deterioration confirmation step of confirming deteriorated parts by tapping the concrete areas along both sides of the joint between concrete members, a filler filling step of filling the recessed areas where the concrete of the deteriorated parts has been removed with a light-curable filler and leveling it, and a light irradiation step of curing the light-curable filler by irradiating it with light of a wavelength that hardens the leveled light-curable filler.

[0009] Furthermore, it is desirable that the construction method for the earthquake-resistant flexible joint and the concrete member repair method include a cutting step of cutting the surface of the deteriorated portion or a primer application step of applying a primer to the recessed area, before the filler material filling step. Furthermore, the photocurable filler is preferably made of a material that hardens upon irradiation with ultraviolet light or light containing ultraviolet light. [Effects of the Invention]

[0010] According to the present invention's method for constructing earthquake-resistant flexible joints and repairing concrete members, the light-curing filler material used to fill deteriorated areas can be cured in a few minutes to tens of minutes. Therefore, the curing time can be significantly reduced compared to the curing time (3 to 7 days) when conventional mortar is allowed to dry and harden. Furthermore, the light-curing filler material is filled into the depressions where the deteriorated concrete has been removed. Consequently, the method for constructing earthquake-resistant flexible joints and repairing concrete members can save on materials used for repair and shorten working time compared to, for example, the case where a light-curing sheet is used together with the light-curing filler material. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram illustrating the state in which the seismic-resistant flexible joint according to the first embodiment is applied to a concrete member. [Figure 2] This is a cross-sectional perspective view illustrating the configuration of a seismic-resistant flexible joint used in the construction method of the seismic-resistant flexible joint according to the first embodiment, with a partial cross-section. [Figure 3] This is a flowchart showing the construction method for the seismic-resistant flexible joint according to the first embodiment. [Figure 4] This is a schematic diagram illustrating the state of measuring the site as a preparation step in the construction method of the seismic-resistant flexible joint according to the first embodiment. [Figure 5] This is a schematic diagram illustrating the process of checking for deteriorated parts in the construction method of a seismic-resistant flexible joint according to the first embodiment. [Figure 6] This is a cross-sectional view along the line VI-VI in Figure 5. [Figure 7] This is a schematic diagram showing the primer application step in the construction method of the seismic-resistant flexible joint according to the first embodiment, in which adhesive is sprayed into the recess where the deteriorated concrete has been removed. [Figure 8] This is a schematic diagram illustrating a filler filling step in the construction method of a seismic-resistant flexible joint according to the first embodiment, in which a light-curing filler is filled into a recess and flattened using a trowel. [Figure 9] Figure 8 shows a cross-sectional view along the IX-IX line. [Figure 10] This is a schematic diagram illustrating the light irradiation process in the construction method of the seismic-resistant flexible joint according to the first embodiment. [Figure 11] This is a schematic diagram illustrating the state in which anchor bolts have been driven in, in the construction method of the seismic-resistant flexible joint according to the first embodiment. [Figure 12] This is a schematic diagram illustrating the arrangement of expansion members in the construction method of the seismic-resistant flexible joint according to the first embodiment. [Figure 13] This is a schematic diagram illustrating the state in which a protective sheet is placed in the construction method of the seismic-resistant flexible joint according to the first embodiment. [Figure 14] This is a schematic diagram illustrating the state in which the construction of the seismic-resistant flexible joint according to the first embodiment is completed by tightening nuts onto the anchor bolts. [Figure 15] This is a flowchart illustrating the construction method of the earthquake-resistant flexible joint according to the second embodiment. [Figure 16]It is a perspective view schematically showing a cutting process in a construction method of a seismic flexible joint according to the second embodiment. [Figure 17] It is a cross-sectional view taken along line XVII-XVII of FIG. 16. [Figure 18] It is a perspective view exemplifying another structure for implementing the construction method of the seismic flexible joint according to the present invention. [Figure 19] It is a perspective view exemplifying the configuration of another seismic flexible joint used in the construction method of the seismic flexible joint according to the present invention in a partial cross-section. [Figure 20] It is a plan view exemplifying a state in which the seismic flexible joint of FIG. 16 is constructed. [Figure 21] (a) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing a first modification according to the present invention. (b) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing a second modification according to the present invention. (c) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing a third modification according to the present invention. [Figure 22] (a) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing a fourth modification according to the present invention. (b) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing a fifth modification according to the present invention. (c) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing a sixth modification according to the present invention. [Figure 23] (a) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing a seventh modification according to the present invention. (b) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing an eighth modification according to the present invention. (c) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing a ninth modification according to the present invention. [Figure 24] (a) is a cross-sectional view exemplifying a construction state of a seismic flexible joint showing a tenth modification according to the present invention. (b) is a cross-sectional view exemplifying a state in which the seismic flexible joint of the tenth modification according to the present invention is installed at positions with different angles. [Figure 25] It is a flowchart exemplifying an application example of the construction method of the seismic flexible joint according to the present invention. [Figure 26]This flowchart illustrates an example of the application of the construction method for the earthquake-resistant flexible joint according to the present invention. [Figure 27] This is a perspective view illustrating the cutting process in the construction method for the earthquake-resistant flexible joint according to the present invention. [Figure 28] This is a flowchart illustrating the method for repairing concrete members according to the present invention. [Figure 29] Figures (a) to (d) are schematic cross-sectional views illustrating the state of the concrete member repair method according to the present invention. [Modes for carrying out the invention]

[0012] An embodiment of the present invention will be described with reference to the drawings. In the following description, first, the configuration of a seismic-resistant flexible joint that is placed in the joint of a concrete structure that will be used as piping in a waterway will be described as the first embodiment, and then the construction method of the seismic-resistant flexible joint will be described. As shown in Figure 1, the concrete structure 100 is constructed in a pipe-like manner, connecting cylindrical concrete members 10, 10 to form a waterway. In the concrete structure 100, joints 12 are provided at the connection points 11 between the connecting concrete members 10, 10. However, due to deterioration over time, it is necessary to reinforce the joints 12. Therefore, in the concrete structure 100, seismic-resistant flexible joints 20 are installed at the joints 12.

[0013] As shown in Figure 2, when installing the seismic-resistant flexible joint 20, for example, deteriorated concrete portions in a predetermined range on both sides of the joint 12 are identified and removed to form a recess 8. Then, a light-curable filler 26 is filled into the formed recess 8 and cured by light irradiation. Furthermore, the seismic-resistant flexible joint 20 is installed by fixing the expansion member 21 with anchor bolts 23 while part or all of it is in contact with the light-curable filler 26. The size of the seismic-resistant flexible joint 20 is determined by the required seismic strength. The width of the seismic-resistant flexible joint 20 is determined by the length measured at the construction site and the required seismic strength. This seismic-resistant flexible joint 20 comprises an expansion member 21 that covers the position opposite the joint 12 from above the concrete member 10 repaired with a light-curing filler 26, retaining plates 22, 22 that hold down both ends of the expansion member 21, a protective sheet 24 that covers the expansion member 21 and is fixed by the retaining plates 22, 22, and anchor bolts 23 and nuts 29 that fix the retaining plates 22, 22.

[0014] The expandable member 21 is formed in sheet form from an expandable material such as ethylene propylene rubber. The expandable member 21 has a folded portion 21a that is folded so that the central side overlaps, a flat portion 21b that is continuously pressed down by the pressing plates 22, 22 from the folded portion 21a, and rising portions 21c that rise vertically from the flat portion 21b at both ends of the flat portion 21b. The folded shape of the folded portion 21a is not particularly limited. Furthermore, the flat portion 21b has a width that allows the pressing plates 22 to make contact with it. The flat portion 21b is in a state where the opposing portion is in contact with the light-curable filler 26 and the concrete member 10. The rising portions 21c raise the ends of the flat portion 21b vertically so that the sides of the pressing plates 22 make contact and secure the pressing of the pressing plates 22, 22. Furthermore, the expandable member 21, as an example, has through holes formed at predetermined intervals in the longitudinal direction for passing through anchor bolts 23.

[0015] The retaining plate 22 abuts against the flat portion 21b of the expandable member 21 and is held in place by anchor bolts 23 and nuts 29, preventing water from entering between the retaining plate and the expandable member 21. The retaining plate 22 has a rectangular cross-section and has holes for inserting anchor bolts 23 at predetermined intervals along its longitudinal direction. The retaining plate 22 is made of a metal such as SUS304 or SUS316. The retaining plate 22 is formed to a length of 50 cm to 150 cm, for example, and can be used continuously or cut to a predetermined length as needed.

[0016] The protective sheet 24 covers the expandable member 21 and protects it. The protective sheet 24 has a thickness of, for example, 1.0 mm to 2.0 mm (for example, 1.5 mm) and is made of ethylene propylene rubber. The protective sheet 24 has holes formed at predetermined intervals along its longitudinal direction for inserting anchor bolts 23. The protective sheet 24 is fixed by anchor bolts 23 so as to cover the folded portion 21a and the flat portion 21b of the expandable member 21. In addition, the protective sheet 24 may not be installed depending on the environment in which the concrete member 10 is used.

[0017] Next, the construction method for the earthquake-resistant flexible joint 20 will be explained with reference to Figures 3 to 14. The construction method S100 for seismic-resistant flexible joints includes a deterioration confirmation step S3, a filler material filling step S5, a light irradiation step S6, and an expansion member fixing step SA. As an example, the construction method S100 for seismic-resistant flexible joints includes a preparation step S1A, a deterioration confirmation step S3, a primer application step S4, a filler material filling step S5, a light irradiation step S6, an anchor bolt driving step S7, an expansion member placement step S8, a protective sheet placement step S9, and a nut tightening step S10. The expansion member fixing step SA is a step of fixing the expansion member that covers the joint via anchor bolts, and as an example, it includes an anchor bolt driving step S7, an expansion member placement step S8, a protective sheet placement step S9, and a nut tightening step S10.

[0018] Preparation process S1A is the process of preparing for construction. For example, preparation process S1A includes on-site measurement area setting process S1, which involves taking measurements at the site, and seismic-resistant flexible joint manufacturing process S2, which is based on the measurements. As shown in Figure 4, in the on-site measurement area setting process S1, measurements are taken in the longitudinal direction of the joint 12 at the site, and the repair area 13 is set according to the required seismic strength. Once the on-site measurements are completed, the seismic-resistant flexible joint manufacturing process S2 is carried out based on the measured data, in which the seismic-resistant flexible joint 20 is manufactured. The seismic-resistant flexible joint 20 is manufactured at the manufacturing plant. The seismic-resistant flexible joint 20 prepared in the preparation process S1A is transported to the site and installed.

[0019] In a concrete structure like the one shown in Figure 1, the joints 12 of the concrete members 10, 10 are arranged circumferentially. By performing the preparation step S1A, the area of ​​concrete to be repaired is clarified. By indicating the area of ​​repair 13 on the surface of the concrete member 10, deteriorated parts of the concrete are identified and removed within the boundary line of the indicated repair area 13. The repair area 13 is, for example, the area where seismic-resistant flexible joints 20 are to be installed.

[0020] As shown in Figures 5 and 6, the deterioration confirmation step S3 is a step in which deteriorated areas are confirmed by tapping the concrete area along both sides of the joint 12 between the concrete members 10. In this deterioration confirmation step S3, deteriorated areas on the surface of the concrete members 10 are identified and removed. In the deterioration confirmation step S3, as an example, a tapping test is performed to identify deteriorated areas of the concrete members 10, and the deteriorated concrete is removed using a striking tool such as a hammer 31 or a cutting machine 36 such as a concrete hammer (see Figure 16). In the concrete members 10, deteriorated areas may be partial or they may be areas that are somewhat continuous. By removing the deteriorated areas of the concrete members 10 on both sides of the joint 12, recesses 8 are formed in the concrete members 10. The shape, size, and depth of the recesses 8 vary. In some cases, the recesses 8 are formed spanning from the inside to the outside of the repair area 13. After the deterioration confirmation step S3 is completed, the primer application step S4 is performed.

[0021] As shown in Figure 7, the primer application step S4 is a step of applying a primer (e.g., adhesive) 9 to the recess 8 from which the deteriorated portion of the concrete member 10 has been removed. In the primer application step S4, the primer 9 is applied to the recess 8 by showering or spraying from a spray nozzle via a primer spraying device 32. The applied primer 9 allows the photocurable filler 26 to properly adhere to the recess 8. The primer 9 prevents the photocurable filler 26 from seeping into the concrete member 10 and improves the adhesion between the photocurable filler 26 and the concrete member 10. In the primer application step S4, the primer spraying device 32 is used, but the primer 9 may also be applied by other means such as a brush. After the primer application step S4 is completed, the filler filling step S5 is performed next. In Figures 7 and 8, the intersecting thin lines indicate the state in which the primer 9 has been applied.

[0022] The filler filling process S5 is a process of filling the recess 8, where the deteriorated concrete has been removed, with a light-curing filler 26 and leveling it. In one example, in the filler filling process S5, the light-curing filler 26 is filled into the recess 8, which has been coated with a primer 9. In the filler filling process S5, as shown in Figures 8 and 9, a scraper, such as a brush, spatula, trowel, or flat plate, is used to level the surface. In Figure 8, as an example, a trowel 33 is used to level the light-curing filler 26 filled into the recess 8 so that it is level with the surface of the undeteriorated concrete member 10. Since the filler filling process S5 fills the recess 8, where the deteriorated portion of the concrete member 10 has been removed, the amount of material used can be minimized. Therefore, work efficiency can be increased.

[0023] The photocurable filler 26 is cured by ultraviolet light or light containing ultraviolet light. The photocurable filler 26 is a material mainly containing a putty-like photocurable vinyl ester resin that hardens when irradiated with light of a predetermined wavelength, such as ultraviolet light. The photocurable filler 26 used here is an existing product. As an example, in the next step, the photocurable filler 26 is irradiated at 10 mW / cm using a 250 W metal halide lamp. 2 The material is irradiated with light at a light intensity of 5 minutes. As an example, the photocurable filler 26 can have a cured product hardness of 38 (JIS K 7060) after light irradiation. After the filler filling process S5 is completed, the light irradiation process S6 is performed next.

[0024] The light irradiation step S6 is a step in which the flattened photocurable filler 26 is cured by irradiating it with light of a wavelength that cures the photocurable filler 26. In other words, the light irradiation step S6 is a step in which the photocurable filler 26 is cured by irradiating it with light. As shown in Figure 10, in the light irradiation step S6, for example, a 250W metal halide lamp is used to irradiate the photocurable filler 26 with light via a light irradiation device 34 for about 5 to 10 minutes. The light irradiation device 34, for example, uses a metal halide lamp and irradiates with light in the wavelength range of 350 nm to 725 nm, curing the photocurable filler 26 with light in the ultraviolet wavelength range. In the light irradiation step S6, for example, a stand is used to irradiate the photocurable filler 26 with light using a light irradiation device 34 that uses a metal halide lamp for about 5 to 10 minutes.

[0025] Preferably, the light irradiation device 34 uses multiple mel-halide lamps to irradiate light from above the photocurable filler material 26 filled in multiple recesses 8 for a predetermined time. The lamps used in this light irradiation step S6 are those that can irradiate light in the wavelength range and including the wavelength at which the photocurable filler material 26 hardens, in accordance with the wavelength of light at which the photocurable filler material 26 hardens. Therefore, if the photocurable filler material 26 is a material that hardens in the visible light region, the light irradiation device 34 uses lamps that can irradiate in the visible light region, and if it is a material that hardens in the ultraviolet region, lamps that can irradiate in the ultraviolet region are used. Alternatively, the light irradiation device 34 may use an LED light source that irradiates in a predetermined wavelength range. After the light irradiation step S6 is completed, the anchor bolt driving step S7 is performed next.

[0026] The anchor bolt driving process S7 is a process in which anchor bolts 23 are driven at predetermined intervals into the light-curable filler 26 or concrete member 10. In the anchor bolt driving process S7, as shown in Figure 11, anchor bolts 23 for fixing the expansion member 21 (described later) are driven at regular intervals into the expansion member 21 using a tool such as a rotary hammer drill, in a position where they can be inserted into through holes formed in the expansion member 21. Multiple anchor bolts 23 are driven in and positioned so that a portion of them protrudes from the upper surface of the concrete member 10 or light-curable filler 26. Note that when the anchor bolt driving process S7 is performed, the light-curable filler 26 has hardened sufficiently, so it is necessary to drill holes in it using a tool such as a rotary hammer drill, similar to the concrete member 10. After the anchor bolt driving process S7 is completed, the expansion member placement process S8 is performed next.

[0027] The expansion member placement step S8 is the step of positioning the expansion member 21 such that the through-holes of the expansion member 21 are inserted through the driven anchor bolts 23. When positioned, the expansion member 21 will be in contact with part or all of the photocurable filler 26. In the expansion member placement step S8, as an example, the expansion member 21 made of rubber such as ethylene propylene rubber or synthetic rubber is used. As shown in Figures 2 and 12, the expansion member 21 is positioned in a predetermined folded state. Here, the expansion member 21 comprises flat portions 21b, 21b that abut both ends of the joint 12, a folded portion 21a where the sheet overlaps the flat portions 21b, 21b toward the center, and rising portions 21c, 21c where the ends on the outside of the flat portions 21b, 21b are raised vertically.

[0028] The flat portions 21b, 21b of the expansion joint 21 have through holes formed at regular intervals through which anchor bolts 23 are inserted. The expansion joint 21 used here has a thickness in the range of 4 mm to 8 mm (for example, 6 mm). The expansion joint 21 is formed to cover the repair area 13 of the joint 12 and the concrete members 10 on both sides thereof. The flat portions 21b, 21b of the expansion joint 21 are in contact with part or all of the photocurable filler 26. Note that the portion filled with photocurable filler 26 may be outside the flat portions 21b, 21b, but here, at least a part of the photocurable filler 26 is in contact with the flat portions 21b, 21b. After the expansion joint placement process S8 is completed, the protective sheet placement process S9 is performed.

[0029] The protective sheet placement step S9 is a step in which a protective sheet 24 is placed so as to cover the expandable member 21. In the protective sheet placement step S9, as shown in Figure 13, a protective sheet 24 is used which has through holes formed for the insertion of anchor bolts 23. The protective sheet 24 is made of a material such as ethylene propylene rubber. For example, a protective sheet 24 with a thickness in the range of 1.3 mm to 1.8 mm is used, and in this case, a sheet with a thickness of 1.5 mm is used. The protective sheet 24 also has an adhesive layer on one side and is placed by adhering it to the surface side of the expandable member 21. After the protective sheet placement step S9 is completed, the nut tightening step S10 is performed next.

[0030] The nut tightening process S10 is a process in which nuts 29 are screwed onto anchor bolts 23 that are driven into the position of the light-curable filler 26 and protrude through through holes in the expansion joint 21 and the protective sheet 24 via a retaining plate 22. In the nut tightening process S10, as shown in Figure 14, for example, a metal retaining plate 22 is placed that is continuous in the longitudinal direction along the joint 12 and has through holes at the position of the anchor bolts 23. Then, in the nut tightening process S10, it is attached to the anchor bolts 23 by nuts 29 via the retaining plate 22. The retaining plate 22 used in the nut tightening process S10 is, for example, a metal bar with a rectangular cross-section.

[0031] The retaining plate 22 can be any plate with a thickness ranging from 6 mm to 16 mm, and in this case, a plate with a thickness of 12 mm and a width of 50 mm is used. The length of the retaining plate 22 is not particularly limited, but for example, multiple plates of 50 cm to 150 cm in length are used in a continuous arrangement. The configuration of the retaining plate 22 is also not particularly limited; for example, an angle-shaped retaining plate such as the retaining plate 25K shown in Figure 24 may be used. The retaining plate 22 may also be cut to the appropriate length depending on where it is placed. The material of the retaining plate 22 is preferably metal, and for example, stainless steel such as SUS304 or SUS316 is preferred. In the nut tightening process S10, the nut 29 is tightened onto the anchor bolt 23 using an electric wrench 35 to fix the retaining plate 22 in a downward position. In Figure 14, a portion of the retaining plate 22 is cut to expose the protective sheet 24 directly below it, a portion of the protective sheet 24 is cut to expose the expandable member 21 directly below it, and a portion of the expandable member 21 is also cut to show the result.

[0032] As described above, the seismic-resistant flexible joint 20 is installed in a position that covers the joint 12, and by using the light-curing filler 26 filled into the recess 8, the curing time can be shortened by 3 to 7 days compared to when conventional mortar is used. Furthermore, in each step, the order of the anchor bolt driving step S7 and the expansion member placement step S8 may be reversed. That is, the procedure may be to place the expansion member 21 first and then drive the anchor bolts 23 into the pre-formed through holes in the placed expansion member 21. Similarly, in the steps of the other construction methods shown below, the order of the anchor bolt driving step S7 and the expansion member placement step S8 may be reversed.

[0033] Furthermore, as shown in Figures 15 to 17, the construction method S100B for seismic-resistant flexible joints may also be performed by cutting process S34B between the deterioration confirmation process S3 and the primer application process S4. Cutting process S34B is a process of forming a recess 8 by cutting the surface of the deteriorated part. In this cutting process S34B, for example, as shown in Figure 16, the repair area 13 is cut to form a recess as a whole. The cutting performed in cutting process S34B is carried out in such a way that a cut surface 7 is formed that is lower than the surface of the concrete member 10 and higher than the bottom surface of the recess 8. In cutting process S34B, it is sufficient that the cut surface 7 that forms the recess area is higher than the bottom surface of one or more recesses 8. Here, the cut surface 7 that forms the recess area is higher than the bottom surface of more than half of the multiple recesses 8.

[0034] Of course, it is more preferable that the cutting surface 7, which forms the recessed area, is higher than the bottom surface of all the recesses 8. In the cutting process S34B, by forming a cutting surface 7 that is lower than the surface of the concrete member 10 and higher than the bottom surface of the recesses 8, it is possible to save material of the photocurable filler 26 and maintain a strong reinforced state compared to cutting deeper than the bottom surface of the recesses 8. When a cutting surface 7 is formed, the cutting surface 7 and the recesses 8 are included in the recess to be filled with the photocurable filler 26. In the construction method S100B for seismic-resistant flexible joints, the other steps are the same as the steps in the construction method S100 for seismic-resistant flexible joints that have already been described.

[0035] In the construction methods S100 and S100B for the seismic-resistant flexible joint, the seismic-resistant flexible joint 20 with the configuration shown in Figure 2 was explained as an example in the concrete structure 100 that constitutes the waterway in Figure 1. However, it may also be a water storage tank, such as the concrete structure 100A shown in Figure 18, or other concrete structures not shown. Furthermore, the seismic-resistant flexible joint used may be the seismic-resistant flexible joint 20 shown in Figure 2, or the seismic-resistant flexible joint 20A shown in Figure 19.

[0036] As shown in Figure 19, the seismic-resistant flexible joint 20A fixes the expansion member 21 by pressing down on the retaining plate 22A via a retaining fitting 25. The retaining plate 22A has a rectangular cross-section at its base end (central plate 25a side) and is formed in a C shape, with the C-shaped open portion facing upwards. The retaining fitting 25 comprises a central plate 25a with a hole through which an anchor bolt 23 is inserted, side plates 25b, 25b that are raised vertically at both ends of the central plate 25a, and claw portions 25c, 25c that extend horizontally from each of the side plates 25b, 25b. The retaining fitting 25 supports the retaining plate 22A so that it is pressed down by both claw portions 25c, 25c, thereby fixing the retaining plate 22A in a state of pressing down on the expansion member 21.

[0037] The retaining bracket 25 secures the expansion member 21 via the retaining plate 22A by inserting anchor bolts 23 through holes in the central plate 25a and tightening them with nuts 29. Since the retaining bracket 25 is fixed to the outside of the expansion member 21 at the position of the light-curing filler 26 or concrete member 10 with anchor bolts 23, the expansion member 21 does not have holes for inserting anchor bolts 23. Therefore, in the seismic-resistant flexible joint 20A, water is even less likely to penetrate from the expansion member 21.

[0038] Furthermore, as shown in Figure 20, the expansion members 21 are arranged so as to cover the intersecting joint 12 by making one of the intersecting ends continuous and positioning the other intersecting end to abut against both sides of the continuous expansion member 21. In addition, although Figure 20 illustrates the seismic-resistant flexible joint 20A shown in Figure 19, the seismic-resistant flexible joint 20 shown in Figure 2 or a seismic-resistant flexible joint with a different configuration may be used. Moreover, as shown in Figures 21(a) to 23(c), the configuration may also be that of the first to ninth modified examples of the seismic-resistant flexible joint.

[0039] In other words, as shown in Figures 21(a) to 21(c), the first to third modified examples of the seismic-resistant flexible joints 20B, 20C, and 20D each have a configuration that does not use a protective sheet 24. Furthermore, the seismic-resistant flexible joints 20B, 20C, and 20D use a configuration in which the respective expansion members 21B, 21C, and 21D are bent to form a convex portion in the center that serves as a folding part. The seismic-resistant flexible joints 20B, 20C, and 20D are each of the types that are installed on structures that are judged to have small deformations during earthquakes. Note that the retaining plate 22 shown in Figure 21(a) is formed to be wider than the retaining plate 22 shown in Figures 21(b) and (c), and as an example, its width is twice as wide.

[0040] Furthermore, as shown in Figures 22(a) to 22(c), the fourth to sixth modified examples of the seismic-resistant flexible joints 20E, 20F, and 20G use a configuration in which the respective expansion members 21E, 21F, and 21G are bent, creating two or three convex parts in the center that serve as folding sections. The seismic-resistant flexible joints 20E, 20F, and 20G are each of a type that are installed on structures that have been diagnosed as being susceptible to a certain degree of deformation during earthquakes. In addition, the seismic-resistant flexible joints 20E, 20F, and 20G are configured to have reinforcing fabrics 24E, 24F, and 24G covering the expansion members 21E, 21F, and 21G.

[0041] These reinforcing fabrics 24E, 24F, and 24G are fixed by anchor bolts 23 and have an overlapping section in the center. When the structure changes due to vibrations such as earthquakes, this overlapping section unfolds to reinforce the expansion members 21E, 21F, and 21G, respectively. The timing of the placement of the reinforcing fabrics 24E, 24F, and 24G is the same as the placement of the protective sheet 24 (see Figures 2 and 19), as they replace the protective sheet 24. The reinforcing fabrics 24E, 24F, and 24G are made of materials such as cloth, resin, or other materials used in this type of product. The reinforcing fabrics 24E, 24F, and 24G are stronger than the protective sheet 24, deform more significantly, and are used in facilities subjected to high water pressure.

[0042] Furthermore, as shown in Figures 23(a) to 23(c), the seventh to ninth modified examples of the seismic-resistant flexible joints 20H, 20I, and 20J are configured to use the retaining bracket 25 shown in Figure 19, which has already been explained. The seismic-resistant flexible joints 20H, 20I, and 20J have expansion members 21H, 21I, and 21J with two, three, and four protrusions in the center, respectively, which serve as folding parts. The seismic-resistant flexible joints 20H, 20I, and 20J are each designed to be installed on structures that have been diagnosed as being susceptible to a certain degree of deformation during earthquakes. In one example, the seismic-resistant flexible joint 20H is used without reinforcing fabric. The seismic-resistant flexible joints 20I and 20J are configured to use reinforcing fabric 24I and 24J. The timing of the placement of the reinforcing fabrics 24I and 21J is the same as the timing of the placement of the protective sheet 24 (see Figures 2 and 19), as they replace the protective sheet 24. The reinforcing fabrics 24I and 24J are made of, for example, cloth, resin, or other materials used in this type of product. The seismic-resistant flexible joint 20H may be used with reinforcing fabric, while the seismic-resistant flexible joints 20I and 21J may be used without reinforcing fabrics 24I and 21J.

[0043] Furthermore, the seismic-resistant flexible joints 20 and 20A may be used without the protective sheet 24 already described, or reinforcing cloth may be used instead of the protective sheet 24. Alternatively, the protective sheet 24 may be used instead of the reinforcing cloth used in the seismic-resistant flexible joint. In addition, the folded portion of the expansion member may be in a state other than that specifically shown in the drawings. Also, although the expansion members 21B to 21J are shown without raised sections at both ends in the width direction, they may be configured to include raised sections. And all of the seismic-resistant flexible joints described may be used without using the protective sheet or reinforcing cloth. When reinforcing cloth is used instead of the protective sheet 24, the construction method S100C of the seismic-resistant flexible joint, including the reinforcing cloth placement step S9c, is performed according to the procedure shown in Figure 25.

[0044] As shown in Figures 24(a) and (b), the 10th and 11th modified examples of the seismic-resistant flexible joint 20K cover the expansion member 21K with reinforcing cloth 24K and fix the reinforcing cloth 24K and the expansion member 21K together with anchor bolts 23 via retaining plates 25K positioned on both ends of the expansion member 21K. The expansion member 21K has a single convex portion 21Ka that protrudes upward in the center between the anchor bolts 23, 23, and is continuously provided along the joint 12 in the longitudinal direction. The expansion member 21K is an enlarged version of the expansion member 21D described earlier. The dimension of the expansion member 21K to the top of the convex portion 21Ka, which serves as the folding portion, is approximately the same as the length of one of the flat portions 21Kb.

[0045] Furthermore, the retaining plate 25K comprises a flat portion 25k1 through which the anchor bolts 23 have holes, a raised upper portion 25k2 formed at one end of the flat portion 25k1 facing the joint 12, and a raised lower portion 25k3 formed at the other end of the flat portion 25k1. The raised upper portion 25k2 is formed perpendicular to the flat portion 25k1 so as to rise higher than the bolt heads of the anchor bolts 23. The raised lower portion 25k3 is formed by bending or joining it perpendicularly downward from the flat portion 25k1, and is formed to have a height that is approximately the same thickness as the expansion member 21K.

[0046] Therefore, when the retaining plate 25K is fixed with anchor bolts 23, the lower end of the upright portion 25k3 comes into contact with the upper surface of the concrete member 10. With this configuration, the retaining plate 25K is less likely to be damaged when the rubber deforms due to settlement or when water pressure is applied, as the deformed portion makes contact with the upright portion 25k2 over a surface area, and the expansion member 21K is not damaged when it makes contact with the anchor bolts 23 or nuts 29 at a single point.

[0047] An expandable member 21K with this configuration can be used continuously on structures where, for example, one of the areas on both sides of a joint that were previously flat surfaces becomes a vertical surface, as shown in Figure 21(b). That is, by twisting the expandable member 21K by 90 degrees from the state shown in Figure 21(a), the expandable member 21K can be continuously positioned even when one side is a vertical surface and the other is a horizontal surface, as shown in Figure 24(b). This is because the convex portion 21Ka of the expandable member 21K has a predetermined size, and can deform to follow changes in the angle of the installation surface of 90 degrees or less within that size range. In Figure 24(b), one installation surface is shown at a 90-degree angle to the other. However, as long as the combined angle of the installation surfaces on both sides of the joint 12 where the expansion joint 21K is installed is 90 degrees or less from the horizontal plane, the expansion joint 21K can be used continuously, regardless of whether one installation surface is 30 degrees from the horizontal, the other is 60 degrees from the horizontal, or both installation surfaces are 45 degrees from the horizontal, as long as the total angle is 90 degrees or less.

[0048] Furthermore, in the construction method for the earthquake-resistant flexible joint described earlier, after the deterioration confirmation step S3, the cutting machine 36 (see Figure 16) cuts a predetermined area in step S34B, creating a cutting surface that is higher than the bottom surface of the recess 8. However, as shown in Figure 27, in this cutting step S34B, the concrete member 10 may be cut to create a cutting surface 7 in the repair area 13 that is the same as or lower than the bottom surface of the recess 8.

[0049] Furthermore, the cutting process may be performed without performing the deterioration confirmation process, and the repair area 13 may be cut. That is, as shown in Figures 25 to 27, in the manufacturing methods S100C and S100D for seismic-resistant flexible joints, the cutting process is selected in the deterioration confirmation process or the cutting process SC. In this case, as shown in Figure 27, the cut surface is formed by cutting the concrete member 10 of the repair area 13 with a cutting machine 36 to a predetermined depth. Therefore, after the preparation process, a cutting process is performed to cut the repair area 13, which is a predetermined range including the deteriorated portion, in the area of ​​the concrete member 10 along both sides of the joint 12. Then, a filler filling process is performed in which a light-curable filler is filled, and then the other processes may be performed. When a cut surface is formed in the repair area 13 in the cutting process, the repair area 13 becomes a recess, and the light-curable filler 26 is filled into that recess. Furthermore, after forming a cut surface in the repair area 13, a tapping test may be performed using a hammer or the like. If there are any areas where the concrete member is deteriorated on the cut surface, a recess may be formed on the cut surface.

[0050] When the repair area is cut using such a cutting process and then filled with a photocurable filler, the process is shortened, and compared to, for example, using a photocurable sheet, the work is done using the photocurable filler alone, thus saving material. As shown in Figures 25 and 26, in the construction method in which the cutting process is selected, the work is then carried out in a procedure that includes a filler filling process S5, a light irradiation process S6, an anchor bolt driving process S7, and an expansion joint placement process S8. In the manufacturing method S100D for seismic-resistant flexible joints, the protective sheet placement process using a protective sheet or the reinforcing cloth placement process S9d may be carried out in accordance with the conditions of the construction site. When the cutting process is performed, the repair area may be defined by performing a setting process and making cuts in the concrete surface or marking the area to be repaired on the concrete surface with ink or other means so that the area can be identified. Furthermore, in the flowcharts of Figures 3, 15, 25, and 26, if protective sheets and reinforcing cloth are not used, the expansion member fixing process SA will consist of the anchor bolt driving process S7, the expansion member placement process S8, and the nut tightening process S10.

[0051] Furthermore, although the construction method for earthquake-resistant flexible joints has been explained, for example, as shown in Figures 28 and 29(a) to (b), the concrete repair method B100 may include the deterioration area confirmation step S3, the filler material filling step S5, and the light irradiation step S6 that have already been explained. In other words, the concrete repair method B100 may include the deterioration area confirmation step S3, the filler material filling step S5, and the light irradiation step S6, or the deterioration area confirmation step S3, the primer application step S4, the filler material filling step S5, and the light irradiation step S6.

[0052] Figure 29(a) shows a state in which a portion of the concrete member 10 on one side of the joint 12 has deteriorated, illustrating a case where it is sufficient to repair only the deteriorated portion of the concrete member 10 without having to place an expansion joint 21 on top of the joint 12. The deteriorated portion of the concrete member 10 is confirmed by tapping, and the deteriorated part is removed with a hammer 31 or the like (deterioration confirmation step S3). Then, as shown in Figure 29(b), a primer application step S4 is performed in which a primer is applied to the recess 8. Furthermore, as shown in Figure 29(c), a filler filling step S5 is performed in which a light-curing filler 26 is filled into the recess 8 to which the primer 9 has been applied and made flat, and as shown in Figure 29(d), a light irradiation step S6 is performed. Thus, performing each step in the above procedure is also a suitable method for repairing concrete. Furthermore, as a concrete repair method, the following steps may be taken: deterioration confirmation step S3, cutting step S34B (see Figure 15), primer application step S4, filler application step S5, and light irradiation step S6.

[0053] Furthermore, as shown in Figures 25 to 27, the concrete repair method may also be performed by selecting the cutting process in process SC, followed by the primer process S4, the filler filling process S5, and the light irradiation process S6. Note that the details of each process in the concrete repair method shown here are the same as those already explained in the construction method for seismic-resistant flexible joints. Moreover, in this concrete repair method, since the deteriorated portion of the concrete member 10 is repaired, the repair of the deteriorated concrete member 10 is achieved by performing the aforementioned processes, regardless of whether or not there is a joint 12.

[0054] Although the construction method of the earthquake-resistant flexible joint and the concrete repair method according to the embodiments of the present invention have been described in detail above, the embodiments described above or illustrated are merely examples of embodiments that have been materialized in carrying out the present invention, and the technical scope of the present invention should not be interpreted as being limited by these embodiments. [Explanation of symbols]

[0055] 7 Cutting surface (concave area) 8 recesses 9. Primer (adhesive) 10. Concrete members (existing concrete members) 11 Connection part 12 Joint 13. Repair area (a predetermined area) 20. Seismic-resistant flexible joint 21, 21B~21K Expandable members 22 Pressing plate 23 Anchor bolts 24 protective sheets 25. Retaining clip 26 Photocurable filler 29 nuts 30 Electric cutters 31 Hammer 32 Primer spraying device 33. Scraper 34 Light irradiation device 35 Electric wrench 36 Cutting machine 100 Concrete structures S1A Preparation process S1 On-site measurement area setting process S2 Manufacturing process for earthquake-resistant flexible joints based on measurement S3 Deterioration part confirmation process S34B cutting process S4 Primer application process S5 Filler filling process S6 Light irradiation process S7 Anchor bolt installation process S8 Expansion member placement process S9 Protective sheet placement process S10 Nut tightening process Installation method for S100, S100B, S100C, and S100D seismic-resistant flexible joints. B100 Concrete Repair Methods

Claims

1. The deterioration confirmation process involves tapping the concrete area along both sides of the joint between concrete members to check for deteriorated areas, A filler filling step is performed in which a light-curing filler is filled into the recess where the concrete of the deteriorated portion has been removed and the surface is made flat. A light irradiation step in which the flattened photocurable filler is cured by irradiating it with light of a wavelength that cures the photocurable filler, A method for constructing an earthquake-resistant flexible joint, comprising: an expansion member fixing step of fixing an expansion member that covers the joint via anchor bolts, A method for constructing an earthquake-resistant flexible joint, wherein the expansion member is fixed in a state where it is in partial or complete contact with the surface of the light-curable filler.

2. A method for constructing an earthquake-resistant flexible joint according to claim 1, comprising a cutting step of forming the recess by cutting the surface of the deteriorated portion before the filler material filling step.

3. Prior to the filler filling step, the process includes a cutting step in which the surface of the region including the deteriorated portion is cut to form a recessed region continuous with the recess, The method for constructing an earthquake-resistant flexible joint according to claim 1, wherein the recessed area is cut to be lower than the surface of the undeteriorated concrete and higher than the bottom surface of the recess.

4. The method for constructing a seismic-resistant flexible joint according to claim 1 or claim 2, wherein the photocurable filler hardens when exposed to ultraviolet light or light containing ultraviolet light.

5. A method for constructing an earthquake-resistant flexible joint according to claim 1 or claim 2, wherein a primer application step is performed to apply a primer to the recess before the filler filling step, and the filler filling step is performed to fill the recess to which the primer has been applied with a photocurable filler.

6. The deterioration confirmation process involves tapping the concrete area along both sides of the joint between concrete members to check for deteriorated areas, A filler filling step is performed in which a light-curing filler is filled into the recess where the concrete of the deteriorated portion has been removed and the surface is made flat. A method for repairing a concrete member, comprising: a light irradiation step of irradiating the flattened photocurable filler with light of a wavelength that hardens the photocurable filler; and a light irradiation step of hardening the photocurable filler.

7. The concrete member repair method according to claim 6, further comprising a cutting step of forming the recess by cutting the surface of the deteriorated portion before the filler filling step.

8. Prior to the filler filling step, the process includes a cutting step in which the surface of the region including the deteriorated portion is cut to form a recessed region continuous with the recess, The method for repairing a concrete member according to claim 6, wherein the recessed area is cut lower than the undeteriorated concrete surface and higher than the bottom surface of the recess.

9. The method for repairing a concrete member according to claim 6 or claim 7, wherein the photocurable filler hardens when exposed to ultraviolet light or light containing ultraviolet light.

10. The concrete member repair method according to claim 6 or claim 7, wherein a primer application step is performed to apply a primer to the recess before the filler filling step, and the filler filling step is performed to fill the recessed portion to which the primer has been applied with a light-curable filler.

11. A cutting process to form a recess by cutting a predetermined area including the deteriorated portion in the concrete region along both sides of the joint between concrete members, A filler filling step is to fill the recess with a photocurable filler and make it flat, A light irradiation step in which the flattened photocurable filler is cured by irradiating it with light of a wavelength that cures the photocurable filler, A method for constructing an earthquake-resistant flexible joint, comprising: an expansion member fixing step of fixing an expansion member that covers the joint via anchor bolts, A method for constructing an earthquake-resistant flexible joint, wherein the expansion member is fixed in a state where it is in partial or complete contact with the surface of the light-curable filler.

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