Construction method for earthquake-resistant flexible joint

Abstract

To provide a construction method for an earthquake-resistant flexible joint which can reduce work time.SOLUTION: A construction method S100 for an earthquake-resistant flexible joint comprises a filling step S4 of filling a predetermined range area on both sides of a joint connecting existing concrete members along the joint with a photo-curable filler and leveling the filler, a covering step S5 of covering a surface of the leveled photo-curable filler with a photo-curable sheet, a step S6 of irradiating light of a wavelength that cures the photo-curable sheet and the photo-curable filler to cure the photo-curable filler and the photo-curable sheet, and steps S7 and S8 of fixing an expansion member that covers the photo-curable sheet and the joint via anchor bolts.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method for constructing earthquake-resistant flexible joints to be placed in joints of concrete members. [Background technology]

[0002] In the past, when reinforcing the joints connecting the concrete members that make up a waterway tunnel made of concrete, it has been known to use earthquake-resistant flexible joints (see Non-Patent Document 1). The construction method for these earthquake-resistant flexible joints involves cutting (chipping) the deteriorated concrete wall surface in the left and right areas of the joint to a predetermined range and depth, applying mortar to the recessed areas caused by the cutting, and curing the area. The construction method for earthquake-resistant flexible joints then secures the earthquake resistance and watertight performance of the joints by anchoring earthquake-resistant flexible joints made of rubber sheets to the areas made flat by the mortar. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Seibu Polymer Chemical Co., Ltd.: BC Joint (registered trademark): [Searched November 29, 2023], Internet<URL:https: / / www.seibu-p.co.jp / product / construction / bcjoint.html> Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the construction method for earthquake-resistant flexible joints in concrete members, mortar is used to reinforce the joints, and a curing time of 3 to 7 days is required for the mortar to dry. Therefore, there is a demand for a construction method for earthquake-resistant flexible joints to reinforce joints that can be completed in a short period of time.

[0005] In order to meet the above-mentioned demands, an object of the present invention is to propose a method for constructing earthquake-resistant flexible joints that can shorten the work time. [Means for solving the problem]

[0006] The construction method for earthquake-resistant flexible joints according to the present invention, which solves the above-mentioned problems, includes a cutting step of cutting a predetermined area on both sides of a joint connecting existing concrete members along the joint; a filling step of filling the cut area with a photocurable filler to flatten it; a covering step of covering the flattened surface of the photocurable filler with a photocurable sheet; a step of curing the photocurable filler and the photocurable sheet by irradiating them with light of a wavelength that hardens them; and a step of arranging an elastic member, via an anchor bolt, to cover the photocurable sheet.

[0007] In order to solve the above-mentioned problems, the present invention provides a method for constructing earthquake-resistant flexible joints, which includes the steps of: cutting a predetermined area on both sides of a joint connecting existing concrete members along the joint; filling the cut area with a photocurable filler and flattening it; curing the flattened photocurable filler by irradiating it with light of a wavelength that hardens the photocurable filler; arranging a photocurable sheet to cover the hardened photocurable filler; curing the photocurable sheet by irradiating it with light of a wavelength that hardens the photocurable sheet; and arranging an elastic member, via an anchor bolt, to cover the photocurable sheet.

[0008] It is preferable that the photo-curable filler and the photo-curable sheet are made of a material that is cured by irradiation with ultraviolet light, for example. [Effects of the Invention]

[0009] According to the construction method for earthquake-resistant flexible joints of the present invention, the photocurable filler filled in the areas where the concrete on both sides of the joint has been cut and the photocurable sheet covering the photocurable filler can be cured in a matter of minutes to ten minutes. Therefore, the work of placing anchor bolts and fixing expansion members can be completed in a matter of several tens of minutes, compared to the 3 to 7 days required for conventional work in which mortar is dried and hardened. Therefore, the construction method for earthquake-resistant flexible joints allows for shortened work time. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing a state in which the earthquake-resistant flexible joint according to the first embodiment is attached to a concrete member. FIG. [Figure 2] 1 is a cross-sectional perspective view illustrating, in partial cross section, the configuration of an earthquake-resistant flexible joint used in a method for installing an earthquake-resistant flexible joint according to a first embodiment. FIG. [Figure 3] 3 is a flowchart showing a method for constructing an earthquake-resistant flexible joint according to the first embodiment. [Figure 4] 4 is a schematic diagram illustrating a region setting step for setting a region to be cut in the construction method for an earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 5] 3 is a schematic diagram illustrating a cutting step of cutting the areas where regions have been set in the construction method for the earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 6] 3 is a schematic diagram showing a primer application step of spraying adhesive onto the cut area in the construction method for the earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 7] 3 is a schematic diagram illustrating a filling step of arranging a photocurable filler in the construction method for the earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 8] 3 is a schematic diagram illustrating a covering step of arranging a photocurable sheet in the construction method for the earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 9] 3 is a schematic diagram illustrating a light irradiation step in the construction method for an earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 10]3 is a schematic diagram illustrating a state in which an anchor bolt has been driven in the construction method for an earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 11] 3 is a schematic diagram illustrating a state in which an expansion and contraction member is arranged in the construction method for an earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 12] 3 is a schematic diagram illustrating a state in which a protective sheet is arranged in the method for installing an earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 13] 3 is a schematic diagram illustrating a state in which a nut is tightened onto an anchor bolt to complete installation in the method for installing an earthquake-resistant flexible joint according to the first embodiment. FIG. [Figure 14] 10 is a flowchart illustrating a method for constructing an earthquake-resistant flexible joint according to a second embodiment. [Figure 15] 10 is a perspective view illustrating another structure for implementing the method for installing an earthquake-resistant flexible joint according to the present invention. FIG. [Figure 16] 10 is a perspective view, partly in section, illustrating the configuration of another earthquake-resistant flexible joint used in the method for installing an earthquake-resistant flexible joint according to the present invention. FIG. [Figure 17] FIG. 17 is a plan view illustrating the earthquake-resistant flexible joint of FIG. 16 in an installed state. [Figure 18] (a) is a cross-sectional view illustrating an example of an installed state of an earthquake-resistant flexible joint showing a first modified example of the present invention, (b) is a cross-sectional view illustrating an example of an installed state of an earthquake-resistant flexible joint showing a second modified example of the present invention, and (c) is a cross-sectional view illustrating an installed state of an earthquake-resistant flexible joint showing a third modified example of the present invention. [Figure 19] (a) is a cross-sectional view illustrating an example of an installed state of an earthquake-resistant flexible joint showing a fourth modified example of the present invention, (b) is a cross-sectional view illustrating an example of an installed state of an earthquake-resistant flexible joint showing a fifth modified example of the present invention, and (c) is a cross-sectional view illustrating an installed state of an earthquake-resistant flexible joint showing a sixth modified example of the present invention. [Figure 20](a) is a cross-sectional view illustrating an example of an installed state of an earthquake-resistant flexible joint showing a seventh modified example of the present invention, (b) is a cross-sectional view illustrating an example of an installed state of an earthquake-resistant flexible joint showing an eighth modified example of the present invention, and (c) is a cross-sectional view illustrating an installed state of an earthquake-resistant flexible joint showing a ninth modified example of the present invention. [Figure 21] 16(a) is a cross-sectional view illustrating an example of an installed state of an earthquake-resistant flexible joint showing a tenth modified example of the present invention, and FIG. 16(b) is a cross-sectional view illustrating an example of a state in which the earthquake-resistant flexible joint of the tenth modified example of the present invention is installed at positions with different angles. [Figure 22] 1 is a flowchart illustrating an application example of a construction method for an earthquake-resistant processed joint according to the present invention. [Figure 23] 1 is a flowchart illustrating an application example of a construction method for an earthquake-resistant processed joint according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described with reference to the drawings. In the following description, first, the configuration of an earthquake-resistant flexible joint to be placed in a joint of a concrete structure that will become a pipe used in a waterway will be described as a first embodiment, and then a method for installing the earthquake-resistant flexible joint will be described. As shown in Figure 1, a concrete structure 100 is configured in the shape of a pipe that serves as a waterway by connecting cylindrical concrete members 10, 10. In the concrete structure 100, a joint 12 is provided at the connection portion 11 of the connected concrete members 10, 10, and the joint 12 needs to be reinforced as it deteriorates over time. For this reason, earthquake-resistant flexible joints 20 are installed in the joint 12 portion of the concrete structure 100.

[0012] As shown in Figure 2, the earthquake-resistant flexible joint 20 is used by, for example, cutting (chipping) a predetermined area of ​​deteriorated concrete surface on both sides of the joint 12, filling it with photo-curing filler 26, and then covering it with a photo-curing sheet 27, and then fixing the expansion member 21 with anchor bolts 23. The earthquake-resistant flexible joint 20 comprises an elastic member 21 that covers the position facing the joint 12 from above the photocurable sheet 27, pressure plates 22, 22 that press down on both ends of the elastic member 21, a protective sheet 24 that covers the elastic member 21 and is fixed by the pressure plates 22, 22, and anchor bolts 23 and nuts 29 that fix the pressure plates 22, 22.

[0013] The elastic member 21 is formed into a sheet-like shape from an elastic material such as ethylene propylene rubber. The elastic member 21 has a folded portion 21a folded so that the central portions overlap, a flat portion 21b extending from the folded portion 21a and held down by pressure plates 22, 22, and upright portions 21c rising 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 wide enough to allow the pressure plate 22 to abut against it. Furthermore, the upright portions 21c are formed by raising the ends of the flat portion 21b vertically, so that the sides of the pressure plate 22 abut against them, thereby reliably holding down the pressure plates 22, 22. The elastic member 21 also has through-holes formed at predetermined intervals in the longitudinal direction, through which anchor bolts 23 pass, for example.

[0014] The presser plate 22 abuts against the flat portion 21b of the expandable member 21 and is held down by anchor bolts 23 and nuts 29, preventing water from entering between the expandable member 21 and the photocurable sheet 27. The presser plate 22 has a rectangular cross section and has holes for inserting the anchor bolts 23 at predetermined intervals along the longitudinal direction. The presser plate 22 is made of metal such as SUS304 or SUS316. The presser plate 22 is formed to a length of, for example, 50 cm to 150 cm and can be cut to a predetermined length as needed. As shown in FIG. 2, the presser plate 22 presses the protective sheet 24, together with the expandable member 21, against the photocurable sheet 27.

[0015] The protective sheet 24 covers the elastic member 21 to protect 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 the longitudinal direction, through which the anchor bolts 23 are inserted. The protective sheet 24 is fixed by the anchor bolts 23 so as to cover the folded portion 21a and flat portion 21b of the elastic member 21.

[0016] Next, a method for constructing the earthquake-resistant flexible joint 20 will be described with reference to FIGS. The construction method S100 for earthquake-resistant flexible joints includes a filling step (filling step) S4 of filling and flattening a predetermined area on both sides of a joint 12 that connects existing concrete members with a photocurable filler 26, a covering step (covering step) S5 of covering the surface of the flattened photocurable filler 26 with a photocurable sheet 27, a step (light irradiation step) S5 of hardening the photocurable filler 26 and the photocurable sheet 27 by irradiating them with light of a wavelength that hardens them, and a step (anchor bolt driving step S7, expandable member arrangement step S8) of fixing an elastic member 21 that covers the photocurable sheet 27 and the joint 12 via an anchor bolt 23. That is, the construction method S100 for earthquake-resistant flexible joints includes a cutting step S2, a filling step S4, a covering step S5, a light irradiation step S6, an anchor bolt driving step S7, and an expansion / contraction member arranging step S8. Note that the construction method S100 for flexible joints will be described as follows: an area setting step S1 for setting the cutting area is performed before the cutting step S2; a primer application step S3 is performed after the cutting step S2; and a protective sheet arranging step S9 and a nut tightening step S10 are performed after the expansion / contraction member arranging step S8.

[0017] The area setting step S1 is a step of setting areas to be cut on both sides of the joint 12 to smooth out deteriorated portions of the surface of the concrete member 10. In the area setting step S1, as shown in FIG. 4, for example, linear cuts are made in the surface of the concrete member 10 along the longitudinal direction of the joint 12 at positions that define the boundary lines between predetermined areas on both sides of the joint 12 using a tool such as an electric cutter 30. The cutting area 13 set as the set area is, for example, based on the area to be covered with the photocurable sheet 27. In the area setting step S1, for example, the electric cutter 30 is used to create linear cut grooves, but the cut area can also be set by drawing a boundary line on the concrete surface. In a concrete structure such as that shown in FIG. 1, the joints 12 of the concrete members 10, 10 are arranged circumferentially. By performing the area setting step S1, the cutting area is clearly defined. In particular, by making cuts in the surface of the concrete member 10, the cut concrete peels off at the cut boundary lines, clearly defining the cutting area 13. After the region setting step S1 is completed, the cutting step S2 is carried out.

[0018] The cutting step S2 is a step of cutting (chipping) the surface of the concrete member 10, in which the range of the cutting area 13 has been set. In the cutting step S2, as shown in FIG. 5, the cutting work of the cutting area 13 is carried out using a cutting machine 31 such as a concrete hammer. The work of cutting the surface of the concrete member 10 may be carried out using a tool with a grinding wheel attached to the peripheral surface of a wheel such as a grinder, and the cutting tool is not particularly limited. It is preferable that the actual area cut in the cutting step S2 and the cutting area 13 set in the area setting step S1 are approximately equal, but the cutting area 13 is only a guide and does not need to be identical. After the cutting step S2 is completed, the primer application step S3 is carried out.

[0019] The primer application step S3 is a step of applying a primer (e.g., adhesive) 14 to the cut area 13, which is created by cutting the surface of the concrete member 10. In the primer application step S3, as shown in FIG. 6, the primer 14 is applied to the cut area 13 by showering or spraying from a spray nozzle using a primer sprayer 32. The applied primer 14 ensures that the light-curable filler 26 is properly fixed within the cut area 13. The primer 14 prevents the light-curable filler 26 from seeping into the concrete member 10 and improves adhesion between the light-curable filler 26 and the concrete member 10. Although the primer application step S3 uses the primer sprayer 32, the primer 14 may also be applied by other means, such as a brush. After the primer application step S3 is completed, the filling step S4 is performed. Note that in FIGS. 6 and 7, the applied primer 14 is shown as thin intersecting lines.

[0020] The filling step S4 is a step of filling the cut area 13 to which the primer 14 has been applied with a photocurable filler 26. In the filling step S4, as shown in FIG. 7, for example, a trowel 33 is used to fill the photocurable filler 26 so that it is level and at the same height as the surface of the concrete member 10. The photocurable filler 26 is a material that mainly contains 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. For example, the photocurable filler 26 is applied using a 250W metal halide lamp at 10mW / cm. 2 The photocurable filler 26 is irradiated with light for 5 minutes at a light intensity of 1000 kJ / min. As an example, the photocurable filler 26 can have a hardness of 34 (JIS K 7060) in terms of Barcol hardness after being irradiated with light. Note that the filling step S4 is performed after the next step, the covering step S5, by irradiating light to harden the photocurable filler 26 and the photocurable sheet 27. After the filling step S4 is completed, the covering step S5 is performed.

[0021] The covering step S5 is a step of covering the filled photocurable filler 26 with a photocurable sheet 27 so as to cover the joints 12 but not the joints 12. In the covering step S5, as shown in FIG. 8 , for example, a sheet- or film-shaped photocurable sheet 27 that hardens upon irradiation with light is placed over the photocurable filler 26, excluding the joints 12. That is, in the covering step S5, the photocurable sheet 27 is placed on both sides of the joints 12 to cover the photocurable filler 26. The photocurable sheet 27 used in the covering step S5 is made of, for example, a material in which a glass fiber substrate is mixed with a photocurable vinyl ester resin. The photocurable sheet 27 has a thickness of 0.8 mm or more, for example, 1.0 mm. The photocurable sheet 27 has an adhesive layer on one side. Therefore, the photocurable sheet 27 can also be placed on the side walls or ceiling wall surface, but this can be achieved by adhering the adhesive layer to the surface of the photocurable filler 26 and the surface of the concrete member 10.

[0022] Furthermore, by using the photocurable sheet 27, even if small irregularities occur on the surface of the photocurable filler 26, the thickness of the photocurable sheet 27 can absorb the irregularities, increasing the possibility of ensuring uniform flatness on the surface of the photocurable sheet 27. The photocurable sheet 27 used here is an existing product. In the coating step S5, a 250W metal halide lamp is used at 10mW / cm 2 The photocurable sheet 27 is made of a material that can be cured by irradiating it with light for 5 minutes. For example, the photocurable sheet 27 has a Barcol hardness of 38 when cured (JIS K 7060). After the covering step S5 is completed, the light irradiation step S6 is carried out.

[0023] The light irradiation step S6 is a step of irradiating the photo-curable filler 26 and the photo-curable sheet 27 with light to cure them. In the light irradiation step S6, as shown in FIG. 9 , for example, light is irradiated onto the photo-curable filler 26 and the photo-curable sheet 27 via a light irradiation device 34 using a 250 W metal halide lamp for about 5 to 10 minutes. The light irradiation device 34 uses, for example, a metal halide lamp and irradiates light in the wavelength range of 350 nm to 725 nm, thereby curing the photo-curable filler 26 and the photo-curable sheet 27 with light in the ultraviolet wavelength range. In the light irradiation step S6, for example, light is irradiated onto the photo-curable filler 26 and the photo-curable sheet 27 for about 5 to 10 minutes using the light irradiation device 34 using a metal halide lamp using a stand.

[0024] The light irradiation device 34 preferably uses multiple melhalide lamps to irradiate light from above the photocurable sheet 27 covering the continuous joints 12 for a predetermined period of time. The lamps used in this light irradiation step S6 are those capable of irradiating wavelengths that match the wavelengths of light that cure the photocurable filler 26 and the photocurable sheet 27. Therefore, if the photocurable filler 26 and the photocurable sheet 27 are made of materials that cure in the visible light range, the light irradiation device 34 should use a lamp that can irradiate the visible light range. If the materials cure in the ultraviolet light range, a lamp that can irradiate the ultraviolet light range should be used. The light irradiation device 34 may also use an LED light source that irradiates a predetermined wavelength range. After the light irradiation step S6 is completed, the anchor bolt driving step S7 is performed.

[0025] The anchor bolt driving step S7 is a step of driving anchor bolts 23 at predetermined intervals into positions where the photocurable filler 26 and the photocurable sheet 27 overlap. In the anchor bolt driving step S7, as shown in FIG. 10 , anchor bolts 23 for fixing the telescopic member 21 (described later) are driven into positions within the overlapping area of ​​the photocurable filler 26 and the photocurable sheet 27 so that they can be inserted into through holes formed in the telescopic member 21 using a tool such as a hammer drill. Multiple anchor bolts 23 are driven in, and are arranged so that some of them protrude from the top surface of the photocurable sheet 27. Note that when the anchor bolt driving step S7 is performed, the photocurable filler 26 and the photocurable sheet 27 have sufficiently hardened, so they need to be drilled with a tool such as a hammer drill, as with the concrete member 10. After the anchor bolt driving step S7 is completed, the telescopic member arranging step S8 is performed.

[0026] The telescopic member placement step S8 is a step of placing the telescopic member 21 on the photocurable sheet 27 so that the driven anchor bolts 23 are inserted into the through holes of the telescopic member 21. In the telescopic member placement step S8, as an example, a telescopic member 21 made of rubber such as ethylene propylene rubber or synthetic rubber is used. As shown in FIGS. 2 and 11, the telescopic member 21 is placed in a preset folded state. Here, the telescopic member 21 includes flat portions 21b, 21b that abut against the photocurable sheet 27 on both ends of the joint 12, folded portions 21a formed by folding the sheet from the flat portions 21b, 21b toward the center, and raised portions 21c, 21c formed by vertically raising the outer ends of the flat portions 21b, 21b.

[0027] Furthermore, through holes for inserting anchor bolts 23 are formed at regular intervals in the flat portions 21b, 21b of the elastic member 21. The elastic member 21 used here has a thickness in the range of 4 mm to 8 mm (e.g., 6 mm). The elastic member 21 is formed with a width that places it inside both ends of the photo-curable sheet 27. By placing the width of the elastic member 21 inside the width of the photo-curable sheet 27, it is possible to reliably prevent water from entering the joint side. After the elastic member placement step S8 is completed, the protective sheet placement step S9 is carried out.

[0028] The protective sheet placement step S9 is a step of placing a protective sheet 24 so as to cover the elastic member 21. In the protective sheet placement step S9, as shown in FIG. 12, a protective sheet 24 having through holes formed therein for inserting anchor bolts 23 is used. The protective sheet 24 is made of a material such as ethylene propylene rubber. As an example, the protective sheet 24 has a thickness in the range of 1.3 mm to 1.8 mm, and here, a protective sheet with a thickness of 1.5 mm is used. The protective sheet 24 has an adhesive layer on one side, and is placed by adhering it to the front side of the elastic member 21. After the protective sheet placement step S9 is completed, the nut tightening step S10 is performed.

[0029] The nut tightening step S10 is a step of screwing a nut 29 via a press plate 22 onto the anchor bolt 23 that has been driven into the position of the photocurable filler 26 and that protrudes through the through hole of the expandable member 21 and the through hole of the protective sheet 24. In the nut tightening step S10, as shown in Fig. 13, for example, a metal press plate 22 that is continuous in the longitudinal direction along the joint 12 and has a through hole at the position of the anchor bolt 23 is placed, and the press plate 22 is attached to the anchor bolt 23 with the nut 29 via the press plate 22. The press plate 22 used in the nut tightening step S10 is, for example, a metal bar that is made of metal and has a rectangular cross section.

[0030] For example, the thickness of the pressure plate 22 ranges from 10 mm to 15 mm. Here, a pressure plate with a thickness of 12 mm and a width of 50 mm is used. The length of the pressure plate 22 is not particularly limited, but for example, pressure plates with a length of 50 cm to 150 cm are used by arranging them continuously. The configuration of the pressure plate 22 is not particularly limited, and for example, an angle-shaped pressure plate such as pressure plate 25K shown in FIG. 21 may be used. Depending on the location where the pressure plate 22 is to be installed, the pressure plate 22 may be cut to fit the length of the location. The pressure plate 22 is preferably made of metal, for example, stainless steel such as SUS304 or SUS316. In the nut tightening step S10, a nut 29 is tightened onto the anchor bolt 23 using an electric wrench 35 to fix the pressure plate 22 so as to press it downward. In Figure 13, a portion of the pressure plate 22 is broken away to reveal the protective sheet 24 directly below, a portion of the protective sheet 24 is broken away to reveal the elastic member 21 directly below, and a portion of the elastic member 21 is also broken away.

[0031] Through the above-described steps, the earthquake-resistant flexible joint 20 is installed in a position covering the joint 12. By using the photocurable filler 26 and the photocurable sheet 27, the curing time can be shortened by 3 to 7 days compared to when conventional mortar is used. Furthermore, in each step, the anchor bolt driving step S7 and the expandable member arranging step S8 may be reversed in order. That is, the expandable member 21 may be first arranged on the photocurable sheet 27, and then the anchor bolt 23 may be driven into the pre-formed through-hole of the arranged expandable member 21. Similarly, in the steps of the other construction methods described below, the anchor bolt driving step S7 and the expandable member arranging step S8 may be reversed in order. In the construction method S100 for earthquake-resistant flexible joints, the photocurable filler 26 and the photocurable sheet 27 are cured by irradiating them with light in a single light irradiation step S6. However, the procedure shown in FIG. 14 may also be used. That is, as shown in FIG. 14, in the construction method S100A for earthquake-resistant flexible joints, the photo-curable filler 26 may be cured by a light irradiation step (first light irradiation step) S45A, followed by a covering step S5 of covering the photo-curable sheet 27, and then a light irradiation step (second light irradiation step) S6. In this way, by performing the light irradiation steps S45A and S6, it is possible to use a photo-curable filler 26 and a photo-curable sheet 27 that are cured by irradiation of light of the same wavelength or light of different wavelengths, thereby broadening the range of material choices. Of course, materials that are cured by irradiation of light of the same wavelength may also be used. In this construction method S100A for earthquake-resistant flexible joints, the other steps are as already described.

[0032] In the construction methods S100 and S100A for earthquake-resistant flexible joints, the earthquake-resistant flexible joint 20 having the configuration shown in Fig. 2 has been described as an example for the concrete structure 100 constituting the waterway in Fig. 1, but it may also be, for example, a water tank which is a concrete structure 100A as shown in Fig. 15, or other concrete structures not shown. The earthquake-resistant flexible joint used may be the earthquake-resistant flexible joint 20 shown in Fig. 2 or the earthquake-resistant flexible joint 20A as shown in Fig. 16.

[0033] As shown in FIG. 16, the earthquake-resistant flexible joint 20A secures the expansion / contraction member 21 by pressing a presser plate 22A via a presser metal fitting 25. The presser plate 22A has a rectangular, C-shaped cross section and is positioned with the open part of the C facing upward. The presser metal fitting 25 includes a center plate 25a having a hole through which the anchor bolt 23 is inserted, side plates 25b, 25b extending vertically from both ends of the center plate 25a, and claws 25c, 25c extending horizontally from each of the side plates 25b, 25b. The presser plate 22A is supported by the presser metal fitting 25 so that it is pressed by both claws 25c, 25c, thereby securing the presser plate 22A in a state in which it presses the expansion / contraction member 21.

[0034] The press fitting 25 presses down and fixes the expandable member 21 via the press plate 22A by inserting anchor bolts 23 into holes in the center plate 25a and tightening them with nuts 29. Note that because the press fitting 25 is fixed with anchor bolts 23 on the outside of the expandable member 21 in the area where the photo-curable filler 26 and the photo-curable sheet 27 overlap, the expandable member 21 does not have holes through which the anchor bolts 23 can be inserted. Therefore, in the earthquake-resistant flexible joint 20A, it is even more difficult for water to seep in through the expandable member 21.

[0035] As shown in Fig. 17, the expansion and contraction members 21 are arranged so that one of the intersecting portions is continuous and the other intersecting portion abuts on both sides of the continuous expansion and contraction member 21, thereby covering the intersecting joint 12. Although Fig. 17 shows the earthquake-resistant flexible joint 20A of Fig. 16 as an example, it is also possible to use the earthquake-resistant flexible joint 20 of Fig. 2 or an earthquake-resistant flexible joint of another configuration. As shown in Figs. 18(a) to 20(c), the configurations of the first to ninth modified examples of the earthquake-resistant flexible joint may also be used.

[0036] 18(a) to 18(c), earthquake-resistant flexible joints 20B, 20C, and 20D of the first to third modified examples are configured without using a protective sheet 24. Furthermore, earthquake-resistant flexible joints 20B, 20C, and 20D use a configuration in which each expansion member 21B, 21C, and 21D is folded to have a single convex portion in the center as a folding portion. Earthquake-resistant flexible joints 20B, 20C, and 20D are each a type that is installed in structures that are judged to have little deformation during an earthquake.

[0037] As shown in Figures 19(a) to 19(c), the earthquake-resistant flexible joints 20E, 20F, and 20G of the fourth to sixth modifications are configured such that the respective expandable members 21E, 21F, and 21G are folded to form two or three central convex portions as folding sections. The earthquake-resistant flexible joints 20E, 20F, and 20G are each designed to be installed in structures diagnosed as being subject to a certain degree of earthquake deformation. The earthquake-resistant flexible joints 20E, 20F, and 20G are configured with reinforcing fabrics 24E, 24F, and 21G that cover the expandable members 21E, 21F, and 21G. The reinforcing fabrics 24E, 24F, and 21G are fixed with anchor bolts 23 and have a central overlapping portion that unfolds to reinforce the expandable members 21E, 21F, and 21G when a change occurs in the structure due to vibrations such as an earthquake. The reinforcing fabrics 24E, 24F, and 21G are arranged at the same time as the process of arranging the protective sheet 24. The reinforcing fabrics 24E, 24F, and 21G are made of, for example, cloth, resin, or other materials used in this type of product. The reinforcing fabrics 24E, 24F, and 21G are stronger than the protective sheet 24, are more susceptible to deformation, and are used in facilities that are subject to high water pressure.

[0038] Furthermore, as shown in Figures 20(a) to 20(c), earthquake-resistant flexible joints 20H, 20I, and 20J of the seventh to ninth modifications are configured to use the clamping metal fitting 25 shown in Figure 16, which has already been described. The earthquake-resistant flexible joints 20H, 20I, and 20J have expandable members 21H, 21I, and 21J configured with two, three, and four central convex portions as folding sections. The earthquake-resistant flexible joints 20H, 20I, and 20J are each designed to be installed in structures diagnosed as having a certain degree of earthquake deformation. The earthquake-resistant flexible joint 20H, as an example, is used without a reinforcing cloth. The earthquake-resistant flexible joints 20I and 20J are configured to use reinforcing cloths 24I and 24J. The reinforcing cloths 24I and 21J are arranged at the same time as the protective sheet 24 is arranged. The reinforcing fabrics 24I, 24J are made of, for example, cloth, resin, or other materials used in this type of product. The earthquake-resistant flexible joint 20H may be used with a reinforcing fabric, and the earthquake-resistant flexible joints 20I, 21J may be used without using the reinforcing fabrics 24I, 21J.

[0039] The earthquake-resistant flexible joints 20 and 20A may be used without using the protective sheet 24 already described, or a reinforcing cloth may be used instead of the protective sheet 24. The protective sheet 24 may also be used instead of the reinforcing cloth used in the earthquake-resistant flexible joint. Furthermore, the folded portions of the expansion members may be in a state other than that specifically shown in the drawings. Although the expansion members 21B to 21J are shown as not having raised portions at both ends in the width direction, they may also be configured to have raised portions. Furthermore, all of the earthquake-resistant flexible joints described in the drawings may be used without using a protective sheet or reinforcing cloth. When a reinforcing cloth is used instead of the protective sheet 24, the construction method S100a for earthquake-resistant flexible joints is performed using the procedure shown in FIG. 22.

[0040] As shown in FIGS. 21(a) and 21(b), in the tenth and eleventh modified examples, the earthquake-resistant flexible joint 20K has an expandable member 21K covered with a reinforcing cloth 24K, which is fixed together with the reinforcing cloth 24K by anchor bolts 23 via presser plates 25K arranged on both ends of the expandable member 21K. The expandable member 21K has one convex portion 21Ka that protrudes above the photocurable sheet 27 in the center between the anchor bolts 23, 23 and extends continuously in the longitudinal direction along the joint 12. The expandable member 21K is a larger convex portion of the expandable member 21D already described. In the expandable member 21K, the height of the convex portion 21Ka as a folded portion is approximately equal to the length of one flat portion 21Kb that is in contact with the photocurable sheet 27.

[0041] The pressing plate 25K also includes a flat portion 25K1 having a through hole for the anchor bolt 23, a plate rising portion 25K2 formed at one end of the flat portion 25K1 on the joint 12 side, and a rising portion 25K3 formed at the other end of the flat portion 25K1. The plate rising portion 25K2 is formed perpendicular to the flat portion 25K1 so as to rise higher than the bolt head of the anchor bolt 23. The rising portion 25K3 is formed by bending downward perpendicular to or joining the flat portion 25K1, and is formed so as to have a height and thickness that is approximately the same as that of the expandable member 21K. Therefore, when the presser plate 25K is fixed with the anchor bolts 23, the lower end of the rising portion 25K3 comes into contact with the upper surface of the photocurable sheet 27. When the presser plate 25K configured in this way is subjected to deformation of the rubber due to subsidence or water pressure, the deformed portion comes into surface contact with the plate rising portion 25K2, making it difficult for the expandable member 21K to be damaged, and preventing the expandable member 21K from coming into point contact with the anchor bolts 23 or nuts 29 and being damaged.

[0042] The telescopic member 21K having such a configuration can be used continuously as is in a structure in which one of the flat areas on both sides of a joint becomes a vertical surface, as shown in Fig. 21(b). That is, by twisting the telescopic member 21K by 90 degrees from the state shown in Fig. 21(a), the telescopic member 21K can be continuously arranged even when one surface becomes vertical and the other becomes horizontal, as shown in Fig. 21(b). This is because the convex portion 21Ka of the telescopic member 21K has a predetermined size, and so can deform within that size range to follow any change in the angle of the installation surface by 90 degrees or less. In Figure 21(b), one installation surface is shown at an angle of 90 degrees from the other installation surface, but as long as the installation surfaces on both sides of the joint 12 where the expandable member 21K is installed change from the horizontal plane by a total of 90 degrees or less, for example, one installation surface is at 30 degrees from horizontal, the other installation surface is at 60 degrees from horizontal, or both installation surfaces are at 45 degrees from horizontal, etc., the expandable member 21K can be used continuously as long as the total angle is 90 degrees or less.

[0043] In the construction method for earthquake-resistant flexible joints described above, a predetermined area is cut using a cutting machine 31, followed by a filling step in which a photocurable filler is filled and flattened. However, the filling step S4 may be performed without the cutting step S2, followed by a covering step S5, a light irradiation step S6, an anchor bolt driving step S7, and an expansion member placement step S8. In other words, if the concrete surface on which the work is performed is uneven so that cutting step S2 is not necessary, the filling step S4 is performed by applying the photocurable filler 26 directly to the concrete surface or by applying a primer, and then flattening the surface. The area definition step S1 and the primer application step S3 may be performed before the filling step S4. Since the area definition step S1 does not involve cutting step S2, instead of cutting the concrete surface, the area to be filled may be marked with ink or other marks to indicate the area. In the construction method S100b for earthquake-resistant flexible joints, each step is carried out as described above, and as an example, as shown in Figure 23, the work may be carried out by performing the other steps in order without performing the cutting step S2. [Explanation of symbols]

[0044] 10 Concrete members (existing concrete members) 11 Connection part 12 Joint 13 Cutting area (predetermined range of area) 14 Primer (adhesive) 20 Earthquake-resistant flexible joints 21, 21B to 21K Expandable members 22 Presser plate 23 Anchor bolt 24 Protective Sheet 25 Clamp 26 Photocurable filler 27 Light-curing sheet 29 Nut 30 Electric Cutter 31 Cutting machine 32 Primer sprayer 33 Iron 34 Light irradiation device 35 Electric wrench 100 Concrete Structures S1 area setting process S2 Cutting process S3 Primer application process S4 Filling process S5 Coating process S6 Light irradiation process S7 Anchor bolt driving process S8 Reversible sheet placement process S9 Protective sheet placement process S10 Nut tightening process

Claims

1. a filling step of filling a predetermined area on both sides of a joint connecting existing concrete members with a light-curing filler material along the joint and leveling the area; a coating step of covering the flattened surface of the photocurable filler with a photocurable sheet; a step of curing the photocurable filler and the photocurable sheet by irradiating the photocurable sheet with light having a wavelength that cures the photocurable filler and the photocurable sheet; and a step of fixing the photocurable sheet and an elastic member covering the joint via an anchor bolt.

2. a filling step of filling a predetermined area on both sides of a joint connecting existing concrete members with a light-curing filler material along the joint and leveling the area; a step of curing the photocurable filler by irradiating the flattened photocurable filler with light having a wavelength at which the photocurable filler is cured; placing a photocurable sheet so as to cover the cured photocurable filler; a step of curing the photocurable sheet by irradiating the photocurable sheet with light having a wavelength that cures the photocurable sheet; and a step of fixing the photocurable sheet and an elastic member covering the joint via an anchor bolt.

3. A cutting step of cutting the area of ​​a predetermined range on both sides of the joint before the filling step, 3. The method for constructing an earthquake-resistant flexible joint according to claim 1, wherein the filling step includes filling the cut area with the photocurable filler to make it flat.

4. 3. The method for constructing an earthquake-resistant flexible joint according to claim 1, wherein the photo-curable filler and the photo-curable sheet are cured by ultraviolet light.

5. 3. The method for constructing an earthquake-resistant flexible joint according to claim 1, wherein the elastic member has a width that allows it to be positioned inside both ends of the photocurable sheet.

6. A construction method for an earthquake-resistant flexible joint as described in claim 1 or claim 2, wherein the anchor bolt is positioned at a position that penetrates the photocurable filler, the photocurable sheet, and the elastic member, and penetrates the pressure plates arranged on both ends of the elastic member along the longitudinal direction of the elastic member and penetrates the elastic member to fix the elastic member.

7. 3. A construction method for an earthquake-resistant flexible joint as described in claim 1 or claim 2, wherein the anchor bolt is installed along the joint at a position on the outside of the expandable member where the photocurable filler and the photocurable sheet overlap, and a pressure plate that continues along the joint on both ends of the expandable member is fixed so as to press down on the expandable member via a pressure fitting.

8. 3. A construction method for an earthquake-resistant flexible joint as described in claim 1 or claim 2, wherein after covering the photocurable sheet and the joint with the elastic member, a protective sheet or reinforcing cloth is placed to cover the elastic member, and the elastic member, protective sheet or reinforcing cloth is fixed via the anchor bolt.

9. The elastic member has one convex portion that protrudes above the light-curing sheet continuously along the joint in the longitudinal direction between the anchor bolts arranged on the left and right sides, A construction method for an earthquake-resistant flexible joint as described in claim 1 or claim 2, wherein at a position where the plane on which the joint is formed changes direction within a range of 90 degrees or less to become an inclined surface, the expandable member is arranged so as to cover the joint and the photocurable sheet continuously from the plane onto the inclined surface where the direction has changed.

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