Reinforcement bar fixing device and crack inducing joint material system using the same

Abstract

To provide a reinforcing bar fixing tool that is easy to install and does not require much time or money, and a crack inducing joint material system that can be easily introduced into concrete structures of general buildings by using the reinforcing bar fixing tool. [Solution] The reinforcing bar fastener (10, 20) is characterized by having reinforcing bar gripping portions (11, 21) provided at both ends, a pair of plate material holding portions (12, 22) formed at a distance between the reinforcing bar gripping portions, and plate material support portions (13, 23) formed between the plate material holding portions and behind the plate material holding portions to sandwich the plate material between the plate material holding portions and from the front and rear, all integrally formed from flexible wire material. This makes it possible to provide a fastener for water-stopping materials and the like with a simple structure and low material costs.

Description

[Technical Field]

[0001] The present invention relates to a rebar fixing device for fixing crack-inducing joint materials (guide plates, water-stopping materials, etc.) to rebars to induce cracks in concrete structures, and a crack-inducing joint material system using the same. [Background technology]

[0002] When constructing a concrete structure, crack-inducing joint materials are sometimes placed inside the concrete formwork to concentrate cracks in predetermined locations. Crack-inducing joint materials are often a combination of guide plates to induce cracks, waterproofing materials for cracks, and decorative materials to conceal cracks from the concrete surface.

[0003] A well-known method for installing such crack-inducing joint materials is to nail joint rods to the outside of the concrete formwork to create gaps and grooves for filling with sealant, and then fasten guide plates to the rebar in the concrete with cable ties. However, this method requires the work of nailing the joint rods to the formwork, fastening the guide plates in place with cable ties, and removing the joint rods and caulking them, which is extremely time-consuming, and there is also the issue of the sealant's ability to stop water decreasing over time.

[0004] Therefore, the present inventors have proposed a combination (system) of crack inducing joint materials as shown in Fig. 13. In Fig. 13, reference numeral 5 denotes a decorative / waterstop unit 5 that is fixed by fitting a unit of waterstop material 2 into a unit of decorative material 1 fixed to a concrete formwork 7 (Patent Document 1), and reference numeral 6 denotes a guide plate holder 6 for fixing a guide plate 3 to a reinforcing bar R (Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Design Registration No. 1675102 [Patent Document 2] Design Registration No. 1678441 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the crack-inducing joint system shown in Figure 13, the water-stopping material 2 is fixed by fitting it into the unit of the decorative material 1, which posed a problem in that it could not meet the demand to eliminate the decorative material 1 due to the specifications of the concrete structure.

[0007] Furthermore, while it is common to install water-stopping materials as crack-inducing joint materials in large civil engineering concrete structures such as bridge abutments and retaining walls, there are few opportunities to use water-stopping materials inside concrete in ordinary building structures such as houses due to the time and expense involved, and the inventors thought that if water-stopping materials could be easily installed, they might be widely adopted in ordinary buildings as well.In response to this issue, the guide plate holder 6 created by the inventors was unable to hold water-stopping materials 2, which have a T-shaped plate and butyl rubber or the like placed on the protruding part.

[0008] The present invention has been made in view of the above circumstances, and aims to provide a rebar fixing device that is easy to install and does not require much effort or cost, and further aims to provide a crack inducing joint material system that uses the rebar fixing device, can be arranged according to customer requests, and is easy to introduce into concrete structures for general architecture. [Means for solving the problem]

[0009] In order to solve the above problems, the reinforcing bar fastener of the first aspect of the present invention is characterized in that it comprises reinforcing bar gripping portions provided at both ends, a pair of plate material holding portions formed at a distance between the reinforcing bar gripping portions and in front of the reinforcing bar gripping portions, and a plate material support portion formed between the plate material holding portions and behind the plate material holding portions, which sandwich the plate material together with the plate material holding portions from the front and back, all of which are integrally formed from flexible wire material.

[0010] In the second aspect of the reinforcing bar fastener, in the first aspect, it is also preferable that the plate material holding portion and the plate material support portion are formed in a single stroke, and that the plate material holding portion forms a circumferential shape that turns inward toward the plate material support portion, with the plate material holding portion at the front and the plate material support portion at the rear.

[0011] In the third aspect of the reinforcing bar fastener, in the first aspect, the plate material holding portion and the plate material support portion are preferably formed in a single stroke, the plate material holding portion forms an inwardly wound circumferential shape facing upward, and the plate material holding portion is formed in the front and the plate material support portion is formed in the rear, and the plate material support portion has a protruding shape that protrudes upward.

[0012] In the reinforcing bar fastener of the fourth aspect, in any one of the first to third aspects, it is also preferable that the reinforcing bar gripping portion extends rearward from the end of the plate material pressing portion and has a substantially S-shape or a substantially U-shape.

[0013] In order to solve the above problem, the crack induction joint material system of the fifth aspect of the present invention comprises the reinforcing bar fixing device of any of the first to fourth aspects, which clamps the flange portion of a T-shaped water-stopping material between the plate material holding portion and the plate material support portion, and positions the protruding portion of the water-stopping material between the plate material holding portions to fix the water-stopping material to a structural reinforcing bar, and a guide plate holder which holds a plate-shaped guide plate perpendicular to the extension direction of the structural reinforcing bar and fixes it to the structural reinforcing bar, and is characterized in that the guide plate holder is fixed to the rear side of the structural reinforcing bar, and the reinforcing bar fixing device is fixed to the front side of the structural reinforcing bar from above.

[0014] In the crack inducing joint system of the sixth aspect, in the fifth aspect, it is also preferable that the length between the rebar gripping portions of the rebar fixing device, when viewed in the extension direction of the structural rebar, is formed to be slightly longer than the length over which the guide plate holder is in contact with the structural rebar, and that the rebar gripping portions are arranged to surround the upper part of the gripping portions of the guide plate holder.

[0015] In the crack inducing joint system of the seventh aspect, in the fifth or sixth aspect, it is also preferable that the gripping portion of the guide plate holder is formed to spread outward when viewed in the extension direction of the structural steel bar, and that the outside of the gripping portion interferes with the inside of the steel bar gripping portion of the steel bar fixing device. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a rebar fixing device that is easy to install and does not require much effort or cost, and a crack inducing joint material system that uses the rebar fixing device and can be easily introduced into concrete structures in general buildings. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view of a reinforcing bar fastener 10 according to a first embodiment of the present invention. [Figure 2] 1A is a perspective view showing the reinforcing bar fastener 10 in use, FIG. 1B is a right side view of the same state, and FIG. 1C is a plan view of the same state. [Figure 3] 1A to 1C are diagrams illustrating how to use the reinforcing bar fastener 10. [Figure 4] FIG. 10 is a perspective view of a reinforcing bar fastener 20 according to a second embodiment of the present invention. [Figure 5] 1A is a perspective view showing the reinforcing bar fastener 20 in use, and FIG. 1B is a right side view of the same state. [Figure 6] FIG. 1 is a front view of a reinforcing bar fastener 10A according to a first modified example. [Figure 7] FIG. 10 is a perspective view of a reinforcing bar fastener 10B according to a second modification. [Figure 8]FIG. 1 is a perspective view of a crack inducing joint system 100 utilizing a rebar fastener 10. [Figure 9] FIG. 1 is a plan view of a crack inducing joint system 100. [Figure 10] FIG. 1 is a plan view of a crack inducing joint material system 100A according to a first modified example. [Figure 11] 10 is a diagram illustrating a crack inducing joint material system 100B according to Modification 2. FIG. [Figure 12] 10 is a diagram illustrating a crack inducing joint material system 100C according to Modification 3. FIG. [Figure 13] This is a conventional crack-inducing joint system. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, preferred embodiments of the present invention will be described with reference to the drawings. In this specification, the front, rear, left, right, top and bottom directions are the directions shown in the drawings.

[0019] (First embodiment of rebar fastener) FIG. 1 is a perspective view of a reinforcing bar fastener 10 according to a first embodiment of the present invention. The reinforcing bar fastener 10 is a reinforcing bar fastener for fastening a water-stopping material, designated by the reference symbol 2 in FIG. 1, to structural reinforcing bars. The water-stopping material 2 is a long metal plate (such as a galvanized plate) with a T-shaped cross section when viewed in the short direction, and is provided with a protruding portion 2a at the center in the short direction. The protruding portion 2a is coated with a water-stopping material (such as non-vulcanized butylcom, not shown), and flange portions 2b are formed on both sides of the base end of the protruding portion 2a. The dimensions of the protruding portion 2a and the flange portions 2b may be selected depending on the installation location.

[0020] The reinforcing bar fastener 10 includes a reinforcing bar gripping portion 11, a plate material holding portion 12, and a plate material support portion 13. The reinforcing bar gripping portions 11 are formed on both the left and right ends of the reinforcing bar fastener 10, while the plate material holding portion 12 and the plate material support portion 13 are formed line-symmetrically in the central region of the reinforcing bar fastener 10, giving the reinforcing bar fastener 10 an overall spectacles-like appearance. The reinforcing bar fastener 10 is formed using a flexible wire material, preferably a metal wire material such as steel or iron, so that the reinforcing bar gripping portion 11, the plate material holding portion 12, and the plate material support portion 13 are integrally formed. Methods for forming the integrally formed portions include winding the wire material together, bonding, welding, and cutting the plate material into a wire shape. However, most preferably, the reinforcing bar gripping portion 11, the plate material holding portion 12, and the plate material support portion 13 are formed by bending the wire material in a single stroke.

[0021] The rebar gripping portion 11 is formed so as to extend rearward from the end 12a of the plate pressing portion 12, and has a generally S-shaped configuration with two curves in the up-down direction. The rebar gripping portion 11 is formed so that the first curve 11a continuing from the end 12a is convex rearward, and the subsequent second curve 11b is convex forward.

[0022] The plate material holding portions 12 are formed in a pair in the left-right direction, spaced apart, and on the same vertical plane, between and in front of the rebar gripping portions 11. For ease of explanation, the left will be referred to as plate material holding portion 12L and the right as plate material holding portion 12R. The end portions 12a of both plate material holding portions 12L and 12R are formed continuously from the rebar gripping portion 11, and extend from end portion 12a toward the center of the rebar fastener 10 and downward to form an inwardly wound ring shape 12b that faces toward end portion 13a of plate material support portion 13. The ring shapes 12b of the plate material holding portions 12L, 12R go around the circumference with the ring start point 12c, the ring bottom vertex 12e, and the ring end point 12d, and are formed so that the ring start point 12c overlaps at the front and the ring end point 12d overlaps at the rear, and the ring end point 12d continues to the end 13a of the plate material support portion 13. The spacing distance of the plate material holding portions 12 can be selected according to the dimensions of the flange portion 2b of the water-stopping material 2.

[0023] The plate material support portion 13 is formed in a straight line between the plate material holders 12L, 12R. The end portion 13a of the plate material support portion 13 is formed to continue from the end point 12d of the ring of the plate material holder 12, so the plate material support portion 13 is formed immediately behind the plate material holders 12L, 12R, and since the ring shape 12b goes around downward, the plate material holders 12L, 12R are formed below the end portion 13a of the plate material support portion 13.

[0024] 2, (A) is a perspective view showing the reinforcing bar fastener 10 according to the first embodiment in use, (B) is a right side view of the same state, and (C) is a plan view of the same state. In the reinforcing bar fastener 10, the ring shape 12b of the plate material holding portion 12 holds the left and right sides of the flange portion 2b of the waterstop material 2, the ring shape 12b of the plate material holding portion 12 and the plate material support portion 13 sandwich the flange portion 2b of the waterstop material 2 from the front and back, and the first curve 11a of the reinforcing bar gripping portion 11 is hooked onto a structural reinforcing bar R (hereinafter simply referred to as reinforcing bar R), thereby fixing the waterstop material 2 to the reinforcing bar R. At this time, the protruding portion 2a of the waterstop material 2 is positioned between the plate material holding portions 12L and 12R, so the reinforcing bar fastener 10 does not interfere with the waterstop portion (protruding portion 2a) of the waterstop material 2. Furthermore, because the rebar gripping portion 11, plate material holding portion 12, and plate material support portion 13 are integrally formed, hooking the rebar gripping portion 11 onto the rebar R applies a reaction force pulling the plate material holding portion 12 rearward, and tension is applied to the start point 12c of the ring to hold the waterstop material 2. In addition, when the waterstop material 2 is held by the rebar fixing device 10, the lower vertex 12e of the ring of the plate material holding portion 12 becomes the point of action with the end point 12d of the ring as the fulcrum for the entire waterstop material system, and a moment M (see Figure 2(B)) is generated in the direction of fixing the waterstop material 2 to the rebar R, increasing the holding force of the waterstop material 2.

[0025] FIG. 3 is a diagram illustrating how to use the rebar fastener 10. As shown in FIG. 3(a), first, the rebar fasteners 10 are sequentially passed through the longitudinal ends of the waterstop material 2, and one or more rebar fasteners 10 are placed on the waterstop material 2. Next, as shown in FIG. 3(b), the rebar fasteners 10 are temporarily placed slightly above the rebars (reinforcement bars) in a concrete formwork (not shown). In this state, the rebar fasteners 10 can be easily moved up and down, allowing for adjustment of their placement, since no reaction force is applied to the plate material retainer 12. Next, as shown in FIG. 3(c), the rebar fastener 10 is lowered, and the rebar gripping portion 11 is hooked onto the rebar R. This applies tension to the plate material retainer 12, and the waterstop material 2 is fixed to the rebar R by the rebar fastener 10. Furthermore, by fixing the waterstop material 2 at multiple locations with the rebar fasteners 10, the waterstop material 2, which is long in the vertical direction, is fixed in a state where it is substantially prevented from rotating in the front-to-rear direction. Furthermore, due to the shape and flexibility of the reinforcing bar gripping portion 11, the reinforcing bar fastener 10 can be used with a number of different reinforcing bar diameters (for example, D13 to D19).

[0026] As described above, the reinforcing bar fastener 10 according to this embodiment can be formed from flexible wire material, and furthermore, can be formed simply by bending the flexible wire material in a single stroke, resulting in a simple structure and low material costs, making it possible to provide an inexpensive fastener for the waterstop material 2. Furthermore, its installation is also extremely easy, as it is simply a matter of passing the reinforcing bar fastener 10 through the waterstop material 2 and hooking it onto the reinforcing bar R, eliminating the need for nailing or screwing.

[0027] Furthermore, since the reinforcing bar fastener 10 according to this embodiment is inexpensive and easy to install, it can be recommended to bury water-stopping materials in concrete structures of general buildings, where their introduction has not progressed due to the effort and cost involved.

[0028] (Second embodiment of rebar fastener) 4 is a perspective view of a reinforcing bar fastener 20 according to a second embodiment of the present invention. Reinforcing bar fastener 20 of this embodiment also comprises a reinforcing bar gripping portion 21, a plate material pressing portion 22, and a plate material supporting portion 23, which are arranged in line symmetry. The method of using reinforcing bar fastener 20 is the same as that of the first embodiment (see FIG. 3), so a description thereof will be omitted.

[0029] The configuration of the reinforcing bar gripping portion 21 is similar to that of the reinforcing bar gripping portion 11, and includes a first curve 21a and a first curve 21b.

[0030] The plate material retaining portions 22 of this embodiment are also provided in front of and between the rebar gripping portions 21, spaced apart, as a pair in the left-right direction, and on the same vertical plane, but the plate material retaining portions 22L, 22R are formed so that they form an inwardly wound ring shape 22b continuously from the end 22a continuing from the rebar gripping portion 21 toward the center and upward of the rebar fastener 10, and extend toward the end 23a of the plate material support portion 23. The ring shape 22b goes around from the start point 22c of the ring to the upper vertex 22e of the ring and the end point 22d of the ring, forming a circumferential shape where the start point 22c of the ring overlaps at the front and the end point 22d of the ring overlaps at the rear, and the end point 22d of the ring is formed so that it continues to the end 23a of the plate material support portion 23.

[0031] The plate material support portion 23 of this embodiment is also formed linearly between the plate material holders 22L, 22R, and the end portion 23a of the plate material support portion 23 is formed to continue from the end point 22d of the ring shape 22b, so that the plate material support portion 23 is formed immediately behind the plate material holders 22L, 22R. The difference is that the ring shape 22b of the plate material support portion 23 goes all the way around upward, so that the plate material holders 22L, 22R are formed above the end portion 23a of the plate material support portion 23. Furthermore, the plate material support portion 23 has a protrusion 23b in the center that protrudes upward.

[0032] 5, (A) is a perspective view showing the reinforcing bar fastener 20 in use, and (B) is a right side view of the same state. In the reinforcing bar fastener 20, the ring shape 22b of the plate material retaining portion 22 retains the left and right sides of the flange portion 2b of the water-stopping material 2, the ring shape 12b of the plate material retaining portion 22 and the plate material support portion 23 sandwich the flange portion 2b of the water-stopping material 2 from the front and back, and the first curve 21a of the reinforcing bar gripping portion 21 hooks onto the reinforcing bar R, thereby fixing the water-stopping material 2 to the reinforcing bar R. At this time, the protruding portion 2a of the water-stopping material 2 is positioned between the plate material retaining portions 22L and 22R, so the reinforcing bar fastener 20 does not interfere with the water-stopping portion (protruding portion 2a) of the water-stopping material 2. Furthermore, because the rebar gripping portion 21, plate material pressing portion 22, and plate material support portion 23 are integrally formed, hooking the rebar gripping portion 21 onto the rebar R applies a reaction force pulling the plate material pressing portion 22 backward, and tension that holds the waterstop material 2 at the start point 22c of the ring is applied. Here, when the waterstop material 2 is held by the rebar fastener 20, the upper apex 22e of the ring of the plate material pressing portion 22 is positioned above the end point 22d of the ring, which serves as the fulcrum for the entire waterstop material system, and therefore the upper apex 22e of the ring does not function as a point of action that generates moment M ( FIG. 5(B) ) in the direction that fixes the waterstop material 2 to the rebar R. For this reason, in this embodiment, the protruding shape 23b of the plate material support portion 23 applies a force in the direction of moment M, thereby increasing the holding force of the waterstop material 2.

[0033] As described above, the reinforcing bar fastener 20 according to this embodiment, like the first embodiment, has a simple structure and low material costs, so it can be provided at low cost and the installation work can be made very easy.

[0034] (Modification of rebar fixing device) Next, preferred modifications of the above-described embodiment will be listed. Note that modifications will be described in the first embodiment, and a description of modifications in the second embodiment will be omitted, but similar modifications are possible. Furthermore, the same components as those described above will be assigned the same reference numerals and will not be described again.

[0035] 6 is a front view of a reinforcing bar fastener 10A according to Modification 1 of the reinforcing bar fastener 10, showing several variations. In the first embodiment, the plate material retaining portion 12 has a ring-shaped (circular) periphery, but this periphery may be other circular or polygonal shapes. For example, (a) is an ellipse, (b) is a rectangle, (c) and (d) are a triangle, (e) is a pentagon, and (f) is a rhombus.

[0036] Fig. 7 is a perspective view of a reinforcing bar fastener 10B according to a second modification of the reinforcing bar fastener 10. In the first embodiment, the reinforcing bar gripping portion 11 was substantially S-shaped in the up-down direction, but the reinforcing bar gripping portion 11 of this modification has a substantially U-shape 11c formed therein. This U-shape 11c may be recessed either upward or downward, and during installation (see Fig. 3), if the U-shape 11c has an upward recess, as shown in Fig. 7, the reinforcing bar fastener 10B can be fitted onto the reinforcing bar R from above, or if the U-shape 11c has a downward recess, the reinforcing bar fastener 10B can be fitted onto the reinforcing bar R from below.

[0037] (Crack induction joint system) Next, a crack inducing joint system 100 will be described that utilizes the above-described reinforcing bar fasteners 10, 20. Note that the system will be described using the reinforcing bar fastener 10 according to the first embodiment, and a description of the system using the reinforcing bar fastener 20 according to the second embodiment will be omitted, although similar applications are possible. Furthermore, the same components as those described above will be assigned the same reference numerals and descriptions thereof will be omitted.

[0038] 8 is a perspective view of a crack induction joint material system 100 that utilizes a rebar fixing device 10. The crack induction joint material system 100 (hereinafter also referred to simply as "system 100") comprises a decorative material 1 fixed to a concrete formwork 7, a water-stopping material 2 fixed to the rebar R with the rebar fixing device 10 described above, and a guide plate 3 fixed to the rebar R with a guide plate holder 6 at the same position. The guide plate holder 6 is the one proposed in Patent Document 2, and is made of metal wire material, with rebar gripping portions 61 on both ends and a thin plate material holding portion 62 extending perpendicular to the extension direction P of the rebar R formed in an axisymmetrical shape between the gripping portions 61. In the guide plate holder 6, a thin sheet material holding portion 62 is formed by folding the wire material in half rearward from the gripping portion 61, so that the plate-shaped guide plate 3 can be sandwiched between the thin sheet material holding portions 62, and the guide plate 3 can be fixed to the reinforcing bar R by hooking the first curve of the gripping portion 61, which has a first curve convex forward and a second curve convex backward, onto the reinforcing bar R.

[0039] In the system 100, the guide plate holder 6 is used on the rear side of the reinforcing bar R, and the reinforcing bar fixing device 10 is used on the front side of the reinforcing bar R. The method of use is to first fix the guide plate 3 with the guide plate holder 6 at the crack formation position, then fix the water-stopping material 2 with the reinforcing bar fixing device 10, and then raise the concrete formwork 7 and place the decorative material 1 at the crack formation position Q.

[0040] 9 is a plan view of the crack induction joint material system 100. In the system 100, when viewed in the extension direction P of the reinforcing bar R, the length L10 between the reinforcing bar gripping portions 11 of the reinforcing bar fastener 10 is formed to be slightly longer than the length over which the guide plate holder 6 is in contact with the reinforcing bar R, i.e., the length L6 between the gripping portions 61. As a result, the reinforcing bar gripping portion 11 of the reinforcing bar fastener 10 to be fixed later is positioned so that it surrounds the upper part of the gripping portion 61 of the guide plate holder 6 to be fixed first.

[0041] As described above, according to the crack induction joint material system 100 of this embodiment, the decorative material 1, the water stop material 2, and the guide plate 3 can be separated, so that when it is desired to intentionally set up a location where the condition of cracks can be checked from the exterior surface of the concrete, or for construction such as a water tank where a waterproof coating is required on the exterior surface of the concrete, it is possible to omit the installation of the decorative material 1, and it is possible to easily meet the desire not to use the decorative material 1. Furthermore, because the decorative material 1, the water stop material 2, and the guide plate 3 can be separated, flexible responses are possible, such as thinning out the installation of the water stop material 2 or installing it only in areas where water sealing is desired, and the choice is simply whether or not to use the rebar fixing device 10, so water stop measures can be easily introduced inside the concrete structures of general buildings.

[0042] Furthermore, because the rebar fixing device 10 and guide plate holder 6 of the crack induction joint material system 100 have line-symmetrical shapes, by fixing the rebar gripping portion 11 of the rebar fixing device 10 so that it covers the gripping portion 61 of the guide plate holder 6, it is possible to align and position the protruding portion 2a of the water-stopping material 2 and the guide plate 3 at the crack formation position Q. Furthermore, if the decorative material 1 and the crack formation position Q do not match when the formwork 7 is erected, it is possible to manually move the guide plate holder 6 laterally (by the rebar pitch in the extension direction P) by temporarily releasing the hook of the rebar fixing device 10 from the rebar R, thereby enabling fine adjustment of the positions of the rebar fixing device 10 and the guide plate holder 6.

[0043] Furthermore, depending on the direction in which the concrete is poured, the guide plate 3 may be subjected to strong bending stress due to the pouring pressure, and if only the guide plate holder 6 is used, there is a risk that the gripping portion 61 may come off the rebar R. However, if the guide plate holder 6 is combined with the rebar fixing device 10 to form a system 100, the flange shape of the waterstop material 2 becomes an element that resists bending stress, and also, the rebar gripping portion 11 of the rebar fixing device 10 surrounds the upper side of the gripping portion 61 of the guide plate holder 6, so it is possible to prevent the guide plate holder 6 from coming off.

[0044] (Modification of crack induction joint system) Next, there will be given preferred modifications to the above-described crack inducing joint material system 100. Note that the modifications described below can also be applied to a system that uses the reinforcing bar fastener 20 according to the second embodiment.

[0045] 10 is a plan view of a crack induction joint material system 100A according to Modification 1. In the crack induction joint material system 100A, the gripping portion 61 of the guide plate holder 6 is formed so as to spread outward from the rear to the front when viewed in the extension direction P of the reinforcing bar R. As a result, the outer side of the gripping portion 61 of the guide plate holder 6 lightly interferes with the inner side of the reinforcing bar gripping portion 11 of the reinforcing bar fastener 10, suppressing lateral displacement between them. As a result, it is possible to prevent the waterstop material 2 and the guide plate 3 from shifting from the crack formation position Q.

[0046] Next, the guide plate holder 6 of the crack inducing joint material system 100 can be replaced with a guide plate holder 60 as shown in FIG. 11 or a guide plate holder 600 as shown in FIG.

[0047] FIG. 11 is a plan view of a crack induction joint material system 100B according to Variation 2. The guide plate holder 60 in FIG. 11 was proposed in Design Registration No. 1477289. (A) is a rear perspective view of the guide plate holder 60, and (B) is a plan view showing the guide plate holder 60 in use in the system 100B. The guide plate holder 60 has gripping portions 60a on both ends, each with a downwardly open semicircular arc shape, and a member holding portion 60b in the center between the gripping portions 60a, extending perpendicular to the extension direction P of the rebar R. In the guide plate holder 60, the guide plate 3 can be clamped between the thin sheet material holding portions 60b, which face the wire material behind the gripping portions 60a. The guide plate 3 can be fixed to the rebar R by hooking the gripping portions 60a onto the rebar R. The guide plate holder 60 has a shape that causes only minor interference with the front side of the reinforcing bar R, that is, with the plate support portion 13 of the reinforcing bar fastener 10, and therefore can be combined with the reinforcing bar fastener 10.

[0048] Similarly, FIG. 12 is a plan view of a crack inducing joint system 100C according to Variation 3. The guide plate holder 600 in FIG. 12 is a so-called bolt-type holder. (A) is a front perspective view of the guide plate holder 600, and (B) is a plan view showing the guide plate holder 600 in use in the system 100C. The guide plate holder 600 has a gripping portion 600a with a butterfly bolt attached to a front-opening U-shaped metal fitting and a component holding portion 600b with a butterfly bolt attached to a rear-opening U-shaped metal fitting. The gripping portion 600a and the component holding portion 600b are orthogonal to each other and welded at their base ends. In the guide plate holder 600, the gripping portion 600a is positioned so that it opens horizontally, and the butterfly bolts are used to adjust the rebar diameter and grip the rebar R from above and below. The component holding portion 600b, which opens vertically, can clamp the guide plate 3 by adjusting the plate thickness with the butterfly bolts. That is, as shown in FIG. 11 and FIG. 12, any guide plate holder having a shape that causes only minor interference with the plate support portion 13 of the reinforcing bar fastener 10 can be combined with the reinforcing bar fastener 10.

[0049] It is also preferable that the outside of the gripping portion 60a of the guide plate holder 60 in Fig. 11 be deformed into an outwardly expanding shape so as to interfere with the inside of the rebar gripping portion 11 of the rebar fastener 10, thereby preventing lateral displacement of the system 100B, or that the length of the gripping portion 600a of the guide plate holder 600 in Fig. 12 be such that, when viewed in the extending direction P of the rebar, the length L10 between the rebar gripping portions 11 of the rebar fastener 10 is slightly longer than the length of the gripping portion 600a, so that the rebar gripping portion 11 deforms so as to effectively cover the upper part of the gripping portion 600a.

[0050] Although the preferred embodiments and modifications of the present invention have been described above, these can be modified and combined based on the knowledge of those skilled in the art, and such modifications are also included within the scope of the present invention. [Explanation of symbols]

[0051] 1...decorative material, 2...waterstop material, 2a...protruding portion of waterstop material, 2b...flange portion of waterstop material, 3...guiding plate, 6,60,600...guiding plate fixing device, 7...concrete formwork, 10,20...reinforcing bar fixing device, 11,21...reinforcing bar gripping portion, 12,22...plate material holding portion, 12a,22a...end of plate material holding portion, 12b,22b...ring shape (circumferential shape) of plate material holding portion, 13,23...plate material support portion, 100...crack induction joint material system, R...reinforcing bar, P...extension direction of reinforcing bar

Claims

1. Rebar gripping portions provided on both ends; A pair of plate material holding portions formed between the reinforcing bar gripping portions and in front of the reinforcing bar gripping portions, and spaced apart from each other; a plate material support portion formed between the plate material pressing portions and behind the plate material pressing portions, and sandwiching the plate material together with the plate material pressing portions from the front and rear; It is characterized by being integrally formed from a flexible wire material. Rebar fixings.

2. The plate material pressing portion and the plate material supporting portion are formed in a single stroke, The plate material pressing portion forms a downwardly inwardly wound circumferential shape toward the plate material support portion, with the plate material pressing portion formed in front and the plate material support portion formed in the rear.

2. The reinforcing bar fastener according to claim 1.

3. The plate material pressing portion and the plate material supporting portion are formed in a single stroke, The plate material pressing portion forms an inwardly curled circumferential shape facing upward toward the plate material support portion, with the plate material pressing portion formed in front and the plate material support portion formed in the rear, The plate material support portion has a protruding shape that protrudes upward.

2. The reinforcing bar fastener according to claim 1.

4. The reinforcing bar fastener according to claim 1, wherein the reinforcing bar gripping portion extends rearward from the end of the plate material pressing portion and has a substantially S-shaped or substantially U-shaped configuration.

5. A reinforcing bar fixing device according to claim 1 for fixing a T-shaped water stop material to a structural reinforcing bar; and a guide plate holder that holds the plate-shaped guide plate perpendicular to the extending direction of the structural reinforcing bars. The flange portion of the water-stopping material is sandwiched between the plate material holding portion and the plate material support portion of the reinforcing bar fastener, and the protruding portion of the water-stopping material is disposed between the plate material holding portions of the reinforcing bar fastener, The guide plate holder is fixed to the rear side of the structural reinforcing bar, and the reinforcing bar fixing device is fixed to the front side of the structural reinforcing bar from above. A crack inducing joint system characterized by:

6. A crack inducing joint system as described in claim 5, characterized in that, when viewed in the extension direction of the structural steel bars, the length between the steel bar gripping portions of the steel bar fixing device is formed slightly longer than the length over which the guide plate holder is in contact with the structural steel bars, and the steel bar gripping portions are arranged so as to surround the upper part of the gripping portions of the guide plate holder.

7. A crack inducing joint system as described in claim 5, characterized in that, when viewed in the extension direction of the structural steel bar, the gripping portion of the guide plate holder is formed to spread outward, and the outer side of the gripping portion interferes with the inner side of the steel bar gripping portion of the steel bar fixing device.

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