Joining jigs for joining concrete members, joining structures for concrete members, and methods for joining concrete members.

Abstract

This invention provides a concrete joint structure that allows for easy reuse of concrete members after the joined concrete members have been dismantled. [Solution] A concrete member joining structure, wherein a joining jig is fixed to the joining surface of each of the two concrete members to be joined, the joining jig comprises a plate portion installed on the joining surface of the concrete members, a fixing portion integrally provided on one side of the plate portion and embedded and fixed in the concrete member, a joining jig integrally provided on the other side of the plate portion and provided on the other concrete member, and an engaging portion that engages so as to overlap when viewed from a direction perpendicular to the joining surface.

Description

Technical Field

[0001] The present invention relates to a technique for joining concrete members.

Background Art

[0002] For example, Patent Document 1 describes a technique that enables reuse of members after disassembly with respect to the joining structure of concrete members. In the joining structure described in Patent Document 1, as grout filled in a mechanical joint for connecting reinforcing bars, an organic grout material mainly composed of a thermoplastic resin is used, and a conductor thin film is coated on the surface of the reinforcing bar so as to generate heat by energization. According to such a joining structure, when disassembling the joined concrete members, by energizing the conductor thin film, the organic grout material is plasticized by the generated heat, and the reinforcing bar and the mechanical joint are separated, so that the concrete members can be reused without being damaged.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, as described above, in the joining structure described in Patent Document 1, it is necessary to coat the reinforcing bar with a conductor thin film and energize it at the time of disassembly to heat the grout of the mechanical joint. For this reason, equipment for energization is required at the disassembly site, and there are problems in terms of workability such as the need to take measures against electric leakage.

[0005] The present invention has been made in view of the above points, and an object thereof is to realize a joining structure of concrete members that can easily reuse the concrete members after disassembling the joined concrete members.

Means for Solving the Problems

[0006] To solve the above problems, the present invention provides a joining jig for joining concrete members, comprising: a plate portion installed on the joining surface of the concrete members; an anchoring portion integrally provided on one side of the plate portion and embedded in and fixed to the concrete member; another joining jig integrally provided on the other side of the plate portion and fixed to another concrete member to be joined to the concrete member; and an engaging portion that engages with the joining surface so as to overlap when viewed from a direction perpendicular to the joining surface.

[0007] According to the present invention, the plate portion of the joining jig is fixed to the joining surface of the concrete member by embedding and fixing the anchoring portion in the concrete member. Then, by engaging the engaging portion of the joining jig with a joining jig fixed to the other concrete member to be joined, the concrete members can be joined. Therefore, when dismantling the joined concrete members, the engagement of the joining jig can be released, so the concrete members are not damaged and can be easily reused.

[0008] In the present invention, the engaging portion is capable of engaging with the other joining jig by moving in a predetermined direction parallel to the joining surface relative to the other joining jig, and may be provided with a backing plate portion integrally with the engaging portion, wherein the backing plate portion is configured to prevent movement in the predetermined direction by contacting the other joining jig at a predetermined position.

[0009] In this way, the engaging portion can be engaged with other joining jigs by moving it relative to the joining surface in a predetermined direction parallel to the joining surface. The relative movement of the engaging portion is prevented by contacting the joining jig at a predetermined position, making it easy to position the joining jig in the predetermined direction when engaging the engaging portion.

[0010] Furthermore, in the present invention, the joining jig may be provided with a wedge plate insertion opening through which a wedge plate can be inserted into the gap formed between the joining jig and the other joining jig when the engaging portion is engaged with the other joining jig.

[0011] In this way, a gap is formed between the engaging portion and other joining jigs with which it engages, making it easier to position the joining jigs when engaging the joints. Furthermore, since the wedge plate can be inserted into the gap through the wedge plate insertion opening, rattling due to the gap is prevented, and the joining jigs can be firmly joined to other joining jigs.

[0012] Furthermore, the present invention relates to a concrete member joining structure, wherein a joining jig is fixed to the joining surface of each of the two concrete members to be joined, and the joining jig comprises a plate portion installed on the joining surface of the concrete members, a fixing portion integrally provided on one side of the plate portion and embedded in and fixed to the concrete member, another joining jig integrally provided on the other side of the plate portion and provided on the other concrete member, an engaging portion that engages so as to overlap when viewed from a direction perpendicular to the joining surface, and an engaging portion that engages so as to overlap when viewed from a direction perpendicular to the joining surface.

[0013] According to the present invention, the plate portion of the joining jig is fixed to the joining surface of the concrete member by embedding and fixing the anchoring portion in the concrete member. Then, by engaging the engaging portion of the joining jig with the joining jig fixed to the other concrete member to be joined, the concrete members can be joined. Therefore, when dismantling the joined concrete members, the engagement of the joining jig can be released, so the concrete members are not damaged and can be easily reused.

[0014] In the present invention, when the engaging portion is engaged with the engaging portion of the other joining jig, a gap is formed between the two joining jigs, and a wedge plate may be inserted into this gap.

[0015] In this way, a gap is formed between the two joining jigs, making it easier to position them when engaging them, and the wedge plate inserted into the gap prevents rattling, allowing the two joining jigs to be firmly joined.

[0016] Furthermore, the present invention may also include a fixing jig that restrains the two engaging portions that engage with each other from the surroundings. In this way, the engaged joining jigs can be joined more securely. In this case, the wedge plate described above may be provided integrally with the fixing jig.

[0017] Furthermore, the engaging portion may be configured to engage with the engaging portion of the other joining jig by moving in a predetermined direction parallel to the joining surface relative to the engaging portion of the other joining jig, and may also include a backing plate portion provided integrally with the engaging portion, wherein the backing plate portion is configured to prevent movement in the predetermined direction at a predetermined position.

[0018] In this way, the engaging portion can be engaged with other joining jigs by moving it relative to the joining surface in a direction parallel to the joining surface. At this time, the relative movement of the engaging portion is prevented by contacting the joining jig at a predetermined position, making it easy to position the joining jig in the above relative movement direction when engaging the engaging portion.

[0019] Furthermore, in the concrete member joining structure of the present invention, the engaging portion may include a key portion fixed to the plate portion, the key portion comprising a key base portion rising from the plate portion and a key tip portion bending from the tip of the key base portion, and the key tip portion fitting into the space between the plate portion and the key tip portion of the other joining jig so that the engaging portions engage with each other.

[0020] The present invention also relates to a method for joining concrete members, comprising fixing joining jigs to the joining surfaces of two concrete members to be joined, said joining jig comprising a plate portion installed on the joining surface of the concrete member, a fixing portion integrally provided on one side of the plate portion and embedded and fixed in the concrete member, a joining portion integrally provided on the other side of the plate portion and engaging with the joining jig provided on the other concrete member so as to overlap when viewed from a direction perpendicular to the joining surface, the method comprising the steps of moving the concrete members relative to each other in a direction parallel to the joining surface to engage the engaging portions with each other, and restraining the periphery of the engaged engaging portions.

Advantages of the Invention

[0021] According to the present invention, after disassembling the joined concrete members, it is possible to realize a joining structure of concrete members that enables easy reuse of the concrete members.

Brief Description of the Drawings

[0022] [Figure 1] It is a diagram showing an outline of the joining procedure of RC members 10 and 12 in one embodiment of the present invention, where FIGS. (a) and (c) of the same figure are side views, and FIG. (b) of the same figure is a plan view. [Figure 2] It is a side cross-sectional view showing in detail the joined portion of the RC member, and is a diagram showing the state before the engaging portions of the joining jig are engaged with each other. [Figure 3] It is a side cross-sectional view showing in detail the joined portion of the RC member, and is a diagram showing the state where the engaging portions of the joining jig are engaged with each other. [Figure 4] FIGS. 4(a) and (b) are perspective views of the joining jig. [Figure 5] It is a cross-sectional view taken along the line V-V in FIG. 3. [Figure 6] It is a diagram (part 1) for explaining the procedure of attaching the fixing jig, where (a) is a side cross-sectional view of the joining jig, and (b) is a cross-sectional view taken along the line A-A in (a). [Figure 7]This is a diagram (part 2) illustrating the procedure for attaching the fixing jig, where (a) is a side cross-sectional view of the joining jig and (b) is a cross-sectional view of AA in (a). [Figure 8] This is a diagram (part 3) illustrating the procedure for attaching the fixing jig, where (a) is a side cross-sectional view of the joining jig and (b) is a cross-sectional view of AA in (a). [Figure 9] This figure shows a modified example of an embodiment of the present invention. [Figure 10] This figure shows another modified example of an embodiment of the present invention. [Modes for carrying out the invention]

[0023] The following describes one embodiment of the present invention. This embodiment allows for the joining of precast reinforced concrete members (hereinafter referred to as RC members) 10 and 12 without the use of wet materials such as grout, facilitates dismantling work, and facilitates the reuse of the RC members 10 and 12 after dismantling.

[0024] Figure 1 is a schematic diagram showing the joining procedure of RC members 10 and 12 in one embodiment of the present invention, where Figure (a) and (c) are side views and Figure (b) is a top view. In this embodiment, the case in which the RC members 10 and 12 are beam members will be described.

[0025] As shown in Figures 1(a) to 1(c), in this embodiment, joining jigs 20 and 20a are fixed to the joining end faces 10a and 12a of the RC members 10 and 12, respectively. First, as shown in the plan view of Figure 1(b), the RC members 10 and 12 are positioned so that the positions of the joining jigs 20 and 20a are shifted laterally. From this state, as indicated by the arrows in the figure, the RC member 12 is moved laterally so that the engaging portions 26 and 26a of the joining jigs 20 and 20a interlock and engage with each other, as shown in Figure 1(c). After that, the joining jigs 20 and 20a are restrained and fixed from the surroundings by the fixing jigs 28 and 28a. In this embodiment, a fire-resistant coating material 50 is installed around the entire circumference of the joining jigs 20 and 20a fixed by the fixing jigs 28 and 28a to ensure fire resistance at the joint.

[0026] The joining jig 20 fixed to the RC member 10 and the joining jig 20a fixed to the RC member 12 have symmetrical shapes and are fixed in a state rotated 180° in the vertical plane. In the following, the same numbers will be used for the corresponding component parts of joining jigs 20 and 20a, and the component parts of joining jig 20a will be indicated by adding "a" after the number. In the following explanation, "up", "down", "left", "right", "vertical", and "horizontal" refer to the up, down, left, right, vertical, and horizontal directions when joining jigs 20 and 20a are fixed to the RC members 10 and 12.

[0027] The following describes this embodiment in detail. Figures 2 and 3 are side cross-sectional views showing the joint portions of the RC members 10 and 12 in detail. Figure 2 shows the state before the engaging portions 26 and 26a of the joining jigs 20 and 20a are interlocked, and Figure 3 shows the state after they are interlocked.

[0028] As shown in Figures 2 and 3, the joining jigs 20 and 20a are steel members in which fixing parts 22 and 22a, plate parts 24 and 24a, and engaging parts 26 and 26a are integrated. The fixing parts 22 and 22a and the engaging parts 26 and 26a are provided on opposite sides of the plate parts 24 and 24a.

[0029] Inside the reinforced concrete (RC) members 10 and 12, beam main reinforcement bars 14 and 16 and stirrups 15 and 17 are provided. In this embodiment, the anchorage sections 22 and 22a are made of deformed reinforcing bars and are embedded within the RC members 10 and 12 so as to overlap with the beam main reinforcement bars 14 and 16 by a predetermined length. As a result, the load is transmitted between the beam main reinforcement bars 14 and 16 and the anchorage sections 22 and 22a by lap splices.

[0030] To explain one example of the manufacturing method for RC members 10 and 12, first, beam main reinforcement bars 14 and 16 and stirrups 15 and 17 are installed inside the formwork (in the example in Figure 2, these are outer shell precast formwork bars 11 and 13), and then infill concrete 51 and 53 is poured. Then, before the infill concrete 51 and 53 hardens, the anchoring parts 22 and 22a of the joining jigs 20 and 20a are inserted into the infill concrete 51 and 53 from the joining end faces 10a and 12a side, and the plate parts 24 and 24a are placed at the positions of the joining end faces 10a and 12a of the RC members 10 and 12. This state is maintained until the infill concrete 51 and 53 hardens. In this way, RC members 10 and 12 are manufactured with the joining jigs 20 and 20a fixed to the joining end faces 10a and 12a.

[0031] In the above explanation, it is assumed that the RC structural members 10 and 12 are manufactured using outer shell precast formwork 11 and 13, but the explanation is not limited to this, and they may also be manufactured by assembling formwork plates and pouring concrete into them. Alternatively, the joining jigs 20 and 20a may be installed with the anchoring parts 22 and 22a inserted into the formwork, and then the infill concrete 51 and 53 may be poured.

[0032] Furthermore, regarding the manufacture of the joining jigs 20 and 20a, the entire structure may be cast as a single piece, or, for example, the engaging parts 26 and 26a and the plate parts 24 and 24a may be cast as separate pieces, and the fixing parts 22 and 22a may be welded to the plate parts 24 and 24a. Alternatively, the engaging parts 26 and 26a and the plate parts 24 and 24a may be cast as separate pieces and welded to each other, or the engaging parts 26a and 26a may be manufactured as appropriately divided castings and welded to each other.

[0033] The configuration of the joining jigs 20 and 20a will be described in detail below with reference to Figure 4 and Figure 2. Figures 4(a) and 4(b) are perspective views of the joining jigs 20 and 20a, respectively. As shown in Figure 4, the engaging portions 26 and 26a are parts in which the key portions 261 and 261a and the backing plate portions 262 and 262a are integrally formed.

[0034] As shown in Figures 2 and 4, the key portion 261, 261a is composed of key base portions 2611, 2611a that rise vertically from the plate portions 24, 24a, and key tip portions 2612, 2612a that are bent upward and downward, respectively, from the tips of the key base portions 2611, 2611a.

[0035] As shown in Figure 4, the backing plates 262 and 262a are composed of vertical backing plates 2621 and 2621a, which are integrally formed with the key parts 261 and 261a on the right side facing the key parts 261 and 261a, and horizontal backing plates 2622 and 2622a, which are bent vertically from the upper end of the vertical backing plate 2621 and the lower end of the vertical backing plate 2621a toward the upper part of the key part 261 and the lower part of the vertical backing plate 2621a toward the lower part of the key part 261a, respectively.

[0036] The vertical backing plate portions 2621 and 2621a of the backing plate portions 262 and 262a have slit-shaped openings, which are wedge plate insertion openings 30 and 30a. The wedge plate insertion openings 30 and 30a open on the lower surface of the horizontal backing plate portion 2622 and on the upper surface of the horizontal backing plate portion 2622a, respectively.

[0037] The fixing jigs 28 and 28a shown in Figure 4 are, as will be described later, jigs used to restrain and fix the joining jig 20 and joining jig 20a from the outer periphery after they have been interlocked. The fixing jigs 28 and 28a are constructed by integrally forming frame plates 281 and 281a and wedge plates 282 and 282a. The frame plates 281 and 281a are L-shaped parts consisting of vertical plates 2811 and 2811a and horizontal plates 2812 and 2812a. When the ends of the frame plates 281 and 281a are welded together to form a rectangular frame, the inner dimensions of this frame are configured to match the outer dimensions of the interlocked joining jigs 20 and 20a.

[0038] The wedge plates 282 and 282a are strip-shaped portions formed in a wedge shape, extending parallel to the horizontal plates 2812 and 2812a from the vertical plates 2811 and 2811a, and becoming thinner towards the tip. As will be described later, the wedge plates 282 and 282a are positioned to be inserted into the wedge plate insertion openings 30 and 30a when the horizontal plates 2812 and 2812a of the frame plates 281 and 281a are attached along the upper and lower surfaces of the horizontal support plate portions 2622 and 2622a, respectively.

[0039] With the above configuration, as shown in Figure 4, rectangular horizontal notches 263, 263a extending horizontally are formed between the key tip portions 2612, 2612a and the horizontal backing plate portions 2622, 2622a. The key portions 261, 261a are configured such that the vertical dimension of the key base portions 2611, 2611a is smaller than the vertical dimension of the horizontal notches 263, 263a by a predetermined clearance.

[0040] Furthermore, vertically extending notches 264, 264a are formed between the key tip portions 2612, 2612a and the plate portions 24, 24a. The key portions 261, 261a are configured such that the outer dimensions of the key tip portions 2612, 2612a are smaller than the inner dimensions of the vertical notches 264, 264a by a predetermined clearance.

[0041] As shown in Figure 4, the horizontal notches 263, 263a and the vertical notches 264, 264a are in communication with each other, forming L-shaped interlocking spaces 265, 265a. As will be described later, when the key portion 261 fits into the interlocking space 265a and the key portion 261a fits into the interlocking space 265, the key portions 261, 261a interlock. At that time, a vertical gap G is formed between the key bases 2611, 2611a and the horizontal notches 263, 263a, as shown in Figure 3, corresponding to the clearance between the key bases 2611, 2611a and the horizontal notches 263, 263a. The wedge plates 282 and 282a of the fixing jig 28 are pushed into this gap G through the wedge plate insertion openings 30 and 30a, thereby preventing looseness in the interlocking portion of the key parts 261 and 261a, and the joining jigs 20 and 20a are firmly joined by the wedge effect.

[0042] The procedure for joining the RC structural members 10 and 12 will be explained below with reference to Figures 5 to 8, along with Figure 3.

[0043] Figure 5 is a cross-sectional view of VV in Figure 3. Figures 6 to 8 are diagrams illustrating the procedure for attaching the fixing jigs 28 and 28a, where (a) is a side cross-sectional view of the joining jigs 20 and 20a, and (b) is a cross-sectional view of AA in (a).

[0044] As explained with reference to Figure 1, in this embodiment, the joining jig 20a on the RC member 12 side is moved from the side relative to the joining jig 20 of the RC member 10, thereby engaging the engaging portion 26a with the engaging portion 26 from the side.

[0045] Specifically, as shown in Figures 3 and 5, the RC member 12 is moved laterally so that the key portion 261a on the RC member 12 side fits laterally into the interlocking space 265 on the RC member 10 side, and the key portion 261 fits laterally into the interlocking space 265a. Then, when the sides of the key portions 261a and 261 come into contact with the vertical backing plates 2621 and 2621a, respectively, the movement of the RC member 12 is stopped. As a result, as shown in Figures 3 and 5, the key portion 261 on the RC member 10 side and the key portion 261a on the RC member 12 side are interlocked.

[0046] In this way, by providing vertical backing plates 2621 and 2621a on the engaging portions 26 and 26a, when one engaging portion 26a is moved laterally to engage, the key portions 261 and 261a come into contact with the vertical backing plates 2621a and 2621 of the other joining jigs 20a and 20, respectively, thereby preventing further movement. This makes it easy to position the RC members 10 and 12 in the direction of movement when engaging the engaging portions 26 and 26a.

[0047] As described above, once the key parts 261 and 261a are engaged, the fixing jigs 28 and 28a are then attached. In the following explanation, fixing jig 28a is attached first, followed by fixing jig 28, but the order in which fixing jigs 28 and 28a are attached does not matter.

[0048] First, as shown in Figures 6(a) and (b), the fixing jig 28a is moved laterally and installed so that the upper surface of the horizontal plate 2812a of the fixing jig 28a is aligned with the lower surface of the horizontal backing plate portion 2622a of the backing plate portion 262a, and the wedge plate 282a is inserted into the wedge plate insertion opening 30a of the engaging portion 26a, and the fixing jig 28a is pushed into the gap G between the horizontal backing plate portion 2622a and the key base portion 2611 on the RC structure member 10 side.

[0049] As shown in Figure 7(b), once the vertical plate 2811a of the frame plate 281a reaches the position where it contacts the side surface of the vertical backing plate portion 2621a, the fixing jig 28 is then attached. Similar to the case of attaching the fixing jig 28a, the fixing jig 28 is moved laterally and attached so that the lower surface of the horizontal plate 2812 of the fixing jig 28 is aligned with the upper surface of the horizontal backing plate portion 2622 of the backing plate portion 262, and the wedge plate 282 is inserted into the wedge plate insertion opening 30 of the engaging portion 26, and is pushed into the gap G between the horizontal backing plate portion 2622 and the key base portion 2611a on the RC structure member 12 side.

[0050] Then, as shown in Figure 8(b), when the vertical plate 2811 of the frame plate 281 reaches a position where it contacts the side surface of the vertical backing plate portion 2621, the end of the horizontal plate 2812 of the frame plate 2811 and the end of the vertical plate 2811a of the frame plate 281a, and the end of the vertical plate 2811 of the frame plate 2811 and the end of the horizontal plate 2812a of the frame plate 281a are joined by the welds 40. In this embodiment, since the L-shaped frame plates 281 and 281a are combined in a frame-like structure and the ends are joined, welding can be performed from the side at the upper and lower positions on both sides of the beam, eliminating the need for upward welding, thus improving welding efficiency. The frame plates 281 and 281a are not limited to welding; other methods such as bolting may also be used.

[0051] Finally, fire resistance at the joint is ensured by attaching, for example, a fire-resistant coating material 50 to the entire circumference of the joining jigs 20, 20a and the fixing jigs 28, 28a. However, the attachment of the fire-resistant coating material 50 is not mandatory.

[0052] As described above, according to this embodiment, the key portions 261 and 261a of the joining jigs 20 and 20a interlock with each other, and the key tips 2612 and 2612a engage in the left-right direction in Figure 3 (the direction in which the RC members 10 and 12 move closer to and further apart from each other, that is, so that they overlap when viewed from a direction perpendicular to the joining end faces 10a and 12a of the RC members 10 and 12). This makes it possible to restrain the displacement of the RC members 10 and 12 in the direction in which they move closer to and further apart from each other.

[0053] Furthermore, since the joining jigs 20 and 20a are constrained around them by the fixing jigs 28 and 28a, displacement in the direction parallel to the joining end faces 10a and 12a of the RC members 10 and 12 (up and down and in the depth direction of the paper in Figure 3) is also constrained. Thus, at the joint formed by the joining fixtures 20 and 20a, displacement in all directions is restrained and fixed, making it possible to transmit loads (tensile load, compressive load, longitudinal shear load, lateral shear load) between the joining fixtures 20 and 20a.

[0054] As described above, load transfer is possible between the anchoring portions 22 and 22a of the joining jigs 20 and 20a and the main beam reinforcements 14 and 16 by lap splicing. Therefore, loads can be transmitted between the main reinforcement bars 14 and 16 of the RC members 10 and 12 via the joining jigs 20 and 20a, thereby structurally joining the RC members 10 and 12.

[0055] When dismantling the joined RC members 10 and 12, the fire-resistant coating material 50 is removed, the fixing jigs 28 and 28a are cut, for example by welding, and the wedge plates 282 and 282a are removed by pulling them out from the wedge plate insertion openings 30 and 30. Then, by moving one of the RC members 10 and 12 laterally relative to the other so as to pull the joining jigs 20 and 20a apart laterally, the joining jigs 20 and 20a separate from each other, as shown in Figure 1(b), and the RC members 10 and 12 are dismantled.

[0056] Thus, according to this embodiment, when dismantling the RC members 10 and 12, after cutting and removing the fixing jigs 28 and 28a, the RC members 10 and 12 can be moved laterally relative to each other, thus preventing damage to the RC members 10 and 12. This allows the dismantled RC members 10 and 12 to be easily reused.

[0057] Incidentally, in recent years, due to labor shortages and other factors, there has been a growing demand for the automation of work using robots at construction sites. Traditionally, when joining reinforced concrete members, it was common to inject grout into the mechanical joints that connect the reinforcing bars. However, this conventional method involved many steps and was not suitable for robotic construction. Furthermore, since grout is a wet material, if it is applied by a robot, maintenance work after the work is required, which is time-consuming. In addition, when connecting reinforcing bars with mechanical joints, the heavy concrete members must be positioned with high precision so that the reinforcing bars are inserted into the mechanical joints, and in that sense, it was also not suitable for robotic construction.

[0058] In contrast, in this embodiment, there is no need to fill the mechanical joint with grout as in the conventional construction method described above, so the number of steps is reduced and post-construction maintenance is unnecessary, making it suitable for robotic construction. Furthermore, when moving one of the RC members 12 laterally to engage the joint jigs 20, 20a, as described above, a clearance is provided between the key parts 261, 261a and the engagement spaces 265, 265a, so high positioning accuracy is not required, and in that sense it is also suitable for robotic construction.

[0059] Furthermore, while the installation of the fixing jigs 28 and 28a can be done manually, it can also be done by robot. When installing the fixing jigs 28 and 28a, it is necessary to position the wedge plates 282 and 282a with high precision in order to insert them into the wedge plate insertion openings 30 and 30a. However, since the fixing jigs 28 and 28a are lightweight, positioning by robot is not particularly difficult. In addition, the welding of the welded parts 40 of the fixing jigs 28 and 28a can be done by a welding robot.

[0060] As described above, the joining method for the RC members 10 and 12 in this embodiment is suitable for robotic construction. Furthermore, when dismantling the joined RC members 10 and 12, the fire-resistant coating material 50 is removed, the fixing jigs 28 and 28a are cut, and then one of the RC members 12 is moved in the reverse direction of the joining process, so the dismantling work is also suitable for robotic construction.

[0061] Furthermore, when dismantling joined reinforced concrete (RC) members, the conventional method was to break the concrete near the joint to expose the mechanical joint. This demolition method is time-consuming to break up the concrete, and also presents environmental problems such as the generation of dust during demolition. Moreover, reusing the dismantled RC members requires meticulous care to avoid damaging the reinforcing steel when breaking up the concrete, resulting in poor work efficiency.

[0062] In contrast, in this embodiment, as described above, the fire-resistant coating material 50 can be removed and the fixing jigs 28 and 28a can be cut and removed to easily dismantle the structure. Since the RC members 10 and 12 are not damaged during dismantling, no dust is generated, and the RC members 10 and 12 can be easily reused after dismantling.

[0063] Thus, according to this embodiment, it is possible to provide a joining structure for RC structural members 10 and 12 that allows for easy joining and dismantling by robotic construction, as well as easy reuse of the RC structural members 10 and 12 after dismantling.

[0064] Modifications of this embodiment will be described below. The modified example shown in Figure 9 replaces the deformed reinforcing bars that constitute the anchoring portions 22 and 22a in the above embodiment with anchoring portions 122 and 122a, which are steel rods or flat bars 1221 and 1221a to which studs 1222 and 1222a are welded. According to this embodiment, the studs 1222 and 1222a can resist the tensile force acting on the anchoring portions 122 and 122a.

[0065] The modified example shown in Figure 10 replaces the deformed reinforcing bars that constitute the anchoring portions 22 and 22a in the above embodiment with anchoring portions 222 and 222a, which are steel rods or flat bars, by welding anchoring plates 2222 and 2222a to the ends of steel materials 2221 and 2221a. According to this embodiment, the anchoring plates 2222 and 2222a can resist the tensile force acting on the anchoring portions 222 and 222a. Alternatively, studs may be used as the anchoring portions 222 and 222a, with the heads of the studs serving as the anchoring plates 2222 and 2222a.

[0066] As described in these modified examples, the anchoring portion of the present invention is not limited to rods; it can also be a flat bar or the like. In short, it should be something that can be embedded in a concrete member and capable of transmitting load between it and the concrete.

[0067] Furthermore, the above embodiments and modifications describe the case in which the present invention is applied to the joining of beam members. When joining beam members, a large load may be applied to the joint portion in the in-plane direction of the joining surface (in the in-vertical plane direction since it is the joining surface of the beam members) during the joining work. For this reason, as described in the above embodiments, the key portions 261 and 261a are made to interlock from above and below so that the interlocking portion can bear the vertical load.

[0068] However, the present invention is not limited to joining beam members together, but can also be applied to joining column members together or joining a column member to a beam member. When joining column members together, the locking parts 261, 261a can be engaged in any orientation in the horizontal plane to resist the vertical and horizontal shear loads acting in the in-plane direction of the joining surface (in the horizontal plane direction since it is the joining surface of the column members) by the frictional force generated between the joining jigs 20, 20a and the restraint by the fixing jigs 28, 28a.

[0069] Furthermore, in the above embodiment, the joining jigs 20, 20a are provided in a frame-like structure around the entire circumference by the fixing jigs 28, 28a, thereby constraining and fixing the fixing jigs 28, 28a to any direction of displacement. However, this is not limited to this, and if the direction of displacement to be constrained is limited, it is sufficient to constrain the corresponding parts, for example, by constraining in a U-shape (for example, by using an L-shaped fixing jig with one leg shorter and joining the ends of the shorter legs together).

[0070] Furthermore, in the above embodiment, wedge plates 282 and 282a are provided on both fixing jigs 28 and 28a, but the invention is not limited to this, and a wedge plate may be provided on only one of the fixing jigs 28 and 28a.

[0071] Furthermore, if the wedge plates 282 and 282a can be pressed into the gap between the engaging portions 26 and 26a to create a wedge effect that can sufficiently securely fix the joining jigs 20 and 20a, the fixing jigs 28 and 28a may be omitted, in which case a single wedge plate can be inserted.

[0072] Alternatively, instead of using the fixing jigs 28 and 28a, the engaging portions 26 and 26a may be fixed by, for example, wrapping a reinforcing material such as high-strength fibers around the engaging portions 26 and 26a.

[0073] In the above embodiment, the case of joining RC members 10 and 12 was described, but the present invention is not limited to this and can also be applied to joining steel pipe concrete members, for example. When applied to joining steel pipe concrete, it is sufficient that load transmission can be performed between the anchoring parts 22 and 22a and the steel pipe concrete. [Explanation of Symbols]

[0074] 10, 12 Precast reinforced concrete structural members (RC structural members) 10a, 12a joint end surface 20, 20a Joining jig 22, 22a Fixing section 24, 24a Plate section 26, 26a Engagement part 261, 261a Key part 2611, 2611a key base 2612, 2612a Key tip 262, 262a Backing plate section 2621, 2621a Vertical backing plate section 2622, 2622a Side support plate section 263, 263a Crosscut section 264, 264a Vertical cut section 265, 265a Interlocking space 28, 28a Fixing fixture 281, 281a frame plate 2811, 2811a Vertical plate 2812, 2812a horizontal plate 282, 282a wedge plate 30, 30a Wedge plate insertion opening 40 Welded section 50 Fireproof cladding

Claims

1. A joining jig for joining concrete members, A plate portion installed on the joint surface of the concrete member, An anchoring portion is integrally provided on one side of the plate portion and is embedded and fixed in the concrete member, A jointing jig is integrally provided on the other side of the plate portion and fixed to another concrete member that is joined to the concrete member, and an engaging portion engages with the joint surface so as to overlap when viewed from a direction perpendicular to the joint surface, A joining jig equipped with the following features.

2. The engaging portion is capable of engaging with the other joining jig by moving in a predetermined direction parallel to the joining surface relative to the other joining jig. The joining jig according to claim 1, further comprising a backing plate portion provided integrally with the engaging portion, wherein the backing plate portion is configured to prevent movement in the predetermined direction by contacting the other joining jig at a predetermined position.

3. The joining jig according to claim 1, further comprising a wedge plate insertion opening through which a wedge plate can be inserted into the gap formed between the joining jig and the other joining jig when the engaging portion is engaged with the other joining jig.

4. A concrete member joining structure, A joining jig is fixed to the joining surface of each of the two concrete members to be joined. The aforementioned joining jig is A plate portion installed on the joint surface of each concrete member, An anchoring portion is integrally provided on one side of the plate portion and is embedded and fixed in the concrete member, A concrete member joining structure comprising: an integrally provided on the other side of the plate portion; another joining jig provided on the other concrete member; and an engaging portion that engages with the other so as to overlap when viewed from a direction perpendicular to the joining surface.

5. The concrete member joining structure according to claim 4, wherein the engaging portion engages with the engaging portion of the other joining jig, a gap is formed between the two joining jigs, and a wedge plate is inserted into this gap.

6. The concrete member joining structure according to claim 4, further comprising a fixing jig for restraining the two engaging portions that engage with each other from the surroundings.

7. The concrete member joining structure according to claim 6, wherein, with the engaging portion engaged with the other joining jig, a wedge plate is inserted into the gap formed between the joining jigs, and the wedge plate is integrally formed with the fixing jig.

8. The engaging portion is capable of engaging with the engaging portion of the other joining jig by moving in a predetermined direction parallel to the joining surface relative to the engaging portion of the other joining jig. A concrete member joining structure according to any one of claims 4 to 7, comprising a backing plate portion provided integrally with the engaging portion, wherein the backing plate portion is configured to prevent movement in the predetermined direction at a predetermined position.

9. The engagement portion includes a key portion fixed to the plate portion, The key portion comprises a key base portion rising from the plate portion and a key tip portion bending from the tip of the key base portion. The joint structure for concrete members according to any one of claims 4 to 7, wherein the key tip is fitted into the space between the plate portion of the other joint jig and the key tip, causing the engaging portions to engage with each other.

10. A method for joining concrete members, A joining jig is fixed to each of the joining surfaces of the two concrete members to be joined. The aforementioned joining jig is A plate portion installed on the joint surface of the concrete member, An anchoring portion is integrally provided on one side of the plate portion and is embedded and fixed in the concrete member, The plate portion is integrally provided on the other side, and the joining jig is provided on the other concrete member, and the engaging portion engages with the joining surface so as to overlap when viewed from a direction perpendicular to the joining surface, A step of engaging the engaging portions with each other by moving the concrete members relative to each other in a direction parallel to the joint surface, A step of restraining the area around the engaged portion, A method for joining concrete members, comprising [a specific component].

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