Manufacturing method and rotation jig for buckling restraint brace

Abstract

To provide an efficient method for manufacturing a buckling restraint brace.SOLUTION: There provided is a method for manufacturing a buckling restraint brace which includes: a first process in which a first core material 310 is placed on a first jig 1000, a second core material 320 is welded to the first core material 310, and the first core material 310 is provided with an unbonded material 330; and a second process in which the first jig 1000 on which a core material 300 provided with the unbonded material 330 is arranged, and a second jig 2000 on which a steel pipe 200 is arranged are relatively moved to approach, and the core material 300 is inserted into the steel pipe 200 on the second jig 2000. And in the first step, after welding the second core material 320 to the first core material 310, the core material 300 is rotated on the first jig 1000, and then the unbonded material 330 is provided on the first core material 310.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a buckling restrained brace and a rotation jig. [Background technology]

[0002] A free positioner using a roller chain has been disclosed for the purpose of holding shaped steel beams of different lengths or deformed shaped steel beams and rotating them as necessary (Patent Document 1). Buckling restrained braces are sometimes used as reinforcing materials for buildings (Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-166238 [Patent Document 2] Patent No. 4263664 Summary of the Invention [Problem to be solved by the invention]

[0004] The present inventors came up with the idea of ​​using a free-moving positioner such as that illustrated in Patent Document 1 to rotate the brace core material when manufacturing a buckling restraint brace such as that illustrated in Patent Document 2, particularly in the process of welding the brace core material. However, with this method of manufacturing a buckling restraint brace, after the brace core material is welded on the adjustable positioner, it is necessary to lift the brace core material from the adjustable positioner and move it to a location where the next process will be carried out, which poses the problem of requiring a large amount of space, especially when manufacturing large buckling restraint braces.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide an efficient method for manufacturing a buckling restraint brace. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The present invention relates to a method for manufacturing a buckling restrained brace, the method comprising: a steel pipe; a main body lid that closes an end of the steel pipe; a core material that includes a first core material that is inserted into the steel pipe and has an end that protrudes from the main body lid to the outside of the steel pipe; and a second core material that is welded to the end of the first core material; an unbonded material that is placed on a surface of the first core material; and a filler material that is filled in the steel pipe, the method comprising the steps of: placing the first core material on a first jig; and welding the second core material to the first core material. The method includes a first step of welding and providing the unbonded material to the first core material, and a second step of moving the first jig on which the core material with the unbonded material is placed and a second jig on which the steel pipe is placed so that they are relatively close to each other and inserting the core material into the steel pipe on the second jig, wherein in the first step, after the second core material is welded to the first core material, the core material is rotated on the first jig, and then the unbonded material is provided to the first core material.

[0007] According to this invention, in the first step, after the second core material is welded to the first core material, the core material is rotated on the first jig, and then an unbonded material is provided on the first core material. In other words, the core material can be manufactured while being rotated on the first jig. This allows the buckling restraint brace to be set at an optimal angle for each step in the core material manufacturing process.

[0008] In addition, the process of inserting the core material into the steel pipe can be performed by moving the first jig and the second jig relatively. Therefore, the second process can be performed without moving the core material and the steel pipe to a predetermined location as in the conventional process. Furthermore, the core material and the steel pipe can be produced on the first jig, and the second process can be performed in that state. In other words, the buckling restrained brace can be manufactured efficiently.

[0009] In addition, in the first step and the second step, the height of the core material may be adjusted by the first jig, and the height of the steel pipe may be adjusted by the second jig.

[0010] According to this invention, the height of the buckling restraint brace is adjusted for each process. For example, the ideal posture of the worker may differ for each task, such as welding of the core material or installation of the unbonded material. In this case, by appropriately adjusting the height of the core material using the first jig, each process can always be performed in the ideal posture of the worker. This allows the work to be performed more efficiently.

[0011] The method may further include a third step of filling a filler material into the inside of the steel pipe placed on the second jig after the second step.

[0012] According to this invention, the filler is filled into the inside of the steel pipe placed on the first jig. In other words, the manufacturing process of the buckling restrained brace can be completed on the first jig. Therefore, the buckling restrained brace can be manufactured without requiring a large space.

[0013] In addition, a rotating jig according to the present invention is a rotating jig used in a manufacturing method for a buckling restraint brace, and comprises a U-shaped frame, a plurality of sprockets provided on the frame, a rotating belt connecting the plurality of sprockets with slack, a power shaft connected to one of the plurality of sprockets, and a leg having a moving mechanism, the rotating belt being arranged in two parallel rows.

[0014] According to this invention, the rotating belt connects with slack to a plurality of sprockets provided on a U-shaped frame. This causes the rotating belt to have particularly large slack at the U-shaped opening of the frame. When manufacturing the buckling restrained brace, for example, a core material is placed on the slack in the rotating belt located at the U-shaped opening. This causes the rotating belt to deform to fit the shape of the buckling restrained brace. This makes it possible to hold the buckling restrained brace regardless of its shape.

[0015] In addition, the rotating jig is movable by legs that have a moving mechanism. This allows the buckling restrained brace to be transported by the rotating jig. In other words, the manufacture of the buckling restrained brace can be completed while it is placed on the movable rotating jig, without having to move the buckling restrained brace to a different location for each process. This means that the buckling restrained brace can be manufactured efficiently without requiring a large space. In addition, two rows of rotating belts are installed in parallel, which allows the load of the buckling restraint brace to be distributed, thereby increasing the load capacity.

[0016] The device may further include a height adjustment mechanism for adjusting the height of the frame.

[0017] According to this invention, a height adjustment mechanism for adjusting the height of the frame is further provided. By adjusting the height of the frame, the buckling restraint brace can be installed at an optimal working height for each task.

[0018] The rotating belt may be an endless roller chain.

[0019] According to this invention, an endless roller chain is used for the rotating belt, which ensures the durability of the rotating belt and allows it to be used for a longer period of time.

[0020] Also, the power shaft may be directly connected to the sprocket.

[0021] According to this invention, a power shaft is directly connected to one of the multiple sprockets. When the sprocket is rotated by this power shaft, the rotating belt circulates while appropriately deforming. This movement allows the buckling restraint brace that it holds to rotate freely. Furthermore, the moment of the power shaft can be directly transmitted to the sprocket. This improves rotational efficiency and allows the buckling restraint brace to rotate with a single power shaft. Effect of the Invention

[0022] According to the present invention, an efficient method for manufacturing a buckling restrained brace can be provided. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a front view of a rotating jig according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a left side view of the rotating jig shown in FIG. 1, showing a state in which a steel pipe is placed on a rotating belt. [Diagram 3] 3 is a cross-sectional view showing a rotating belt disposed inside the rotating jig shown in FIG. 2. [Figure 4] FIG. 3 is a schematic diagram showing the rotating belt and the sprocket shown in FIG. 2. [Diagram 5] FIG. 2 is a diagram showing a state in which a core material is placed on a first jig in one embodiment of the present invention, where (a) is a front view and (b) is a cross-sectional view along line bb. [Figure 6] FIG. 2 is a diagram showing a state in which a core material is placed on a first jig and an unbonded material is placed thereon in one embodiment of the present invention, where (a) is a front view and (b) is a cross-sectional view of line bb. [Figure 7] In one embodiment of the present invention, this figure shows the process of inserting a core material placed on a first jig into a steel pipe placed on a second jig, where (a) is a front view, (b) is a cross-sectional view of line bb, and (c) is a cross-sectional view of line cc. [Figure 8] FIG. 2 is a diagram showing a state in which a filler material has been filled into a steel pipe on a first jig in one embodiment of the present invention, where (a) is a front view and (b) is a cross-sectional view along line bb. [Figure 9] In one embodiment of the present invention, this figure shows the state in which a steel pipe has been painted on the first jig and the production of a buckling restraint brace has been completed, where (a) is a front view and (b) is a cross-sectional view of line bb. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, a manufacturing process and a rotation jig for a buckling restraint brace according to one embodiment of the present invention will be described with reference to the drawings. 1 is used to support steel pipes 200 (described later) and core material 300 (described later) in the manufacturing process of the buckling restrained brace in this embodiment. Note that the steel pipes 200 and the core material 300 are both long members. Therefore, these members are supported by the rotating jig 100 by using two rotating jigs 100 as a set and placing both longitudinal ends on the rotating jig 100.

[0025] The rotating jig 100 includes a frame 10 , a sprocket 20 , a rotating belt 30 , a power shaft 40 , a height adjustment mechanism 50 , and legs 60 . The frame 10 is U-shaped and includes two U-shaped plates 11. As shown in Fig. 2, the frame 10 is provided with sprockets 20 at four locations.

[0026] The sprocket 20 is a gear-shaped member that holds the rotating belt 30 (described later) in a circulable manner. As described above, the sprocket 20 is provided at four locations on the frame 10. The sprocket 20 is rotatably supported by the rotating shaft 21. The rotating shaft 21 is a cylindrical member to which the sprocket 20 is attached. Both ends of the rotating shaft 21 are provided between the two U-shaped plates 11. This allows the sprocket 20 to be arranged on the frame 10. Furthermore, as shown in FIG. 1, each rotating shaft 21 supports two sprockets 20. As a result, each rotating jig 100 has two rows of rotating belts 30 arranged in parallel (details will be described later).

[0027] The rotating belt 30 is a deformable annular member. The rotating belt 30 is a member that holds the steel pipe 200 and the core material 300 by appropriately deforming. As shown in FIG. 2, the rotating belt 30 is provided in mesh with the sprockets 20 at four locations. As shown in FIG. 4, the rotating belt 30 is provided with slack in relation to the sprockets 20. For example, an endless roller chain is preferably used as the rotating belt 30. Alternatively, a nylon sling, a rubber belt, or the like may be used as long as it can support the load of the steel pipe 200.

[0028] The power shaft 40 is connected to one of the sprockets 20 provided on the frame 10. The power shaft 40 includes a connection portion 41, a base portion 42, a support portion 43, and a control portion 44. The connecting portion 41 is directly connected to the rotating shaft 21 of the sprocket 20. This allows the power generated by the power shaft 40 to be transmitted to the sprocket 20. The base portion 42 includes an internal motor (not shown) and applies a rotational force to the connection portion 41 . The support portion 43 is provided between the connection portion 41 and the base portion 42. The support portion 43 transmits the rotational force of a motor provided inside the base portion 42 to the connection portion 41.

[0029] The control unit 44 controls the rotation of the motor using a switch or the like. This causes the rotating belt 30 to circulate via the motor. As described above, the rotating jigs 100 are provided in pairs, each supporting a steel pipe 200 and a core material 300. For this reason, the control unit 44 of one rotating jig 100 and the control unit 44 of the other rotating jig 100 may be connected to each other and controlled uniformly.

[0030] The height adjustment mechanism 50 moves the frame 10 up and down. Any structure may be used for the height adjustment mechanism 50, and for example, reciprocating movement using a hydraulic cylinder or an air cylinder, or reciprocating motion using a worm gear is preferably used. The height adjustment mechanism 50 can be controlled by any method. For example, it may be controlled by providing the above-mentioned control unit 44 with a control function for the height adjustment mechanism 50.

[0031] The legs 60 are members that support each component part of the rotating jig 100. The legs 60 are also equipped with a moving mechanism 61. For example, a commercially available swivel caster 62 is preferably used as the moving mechanism 61. This allows the rotating jig 100 to be moved in any direction. The moving mechanism 61 is preferably moved by a worker using manual force.

[0032] As shown in Figures 2 and 3, when a steel pipe 200 is placed on the rotating belt 30, the rotating belt 30 deforms appropriately in accordance with the shape of the outer surface of the steel pipe 200. This allows the rotating belt 30 to hold the steel pipe 200 and the core material 300. The rotating belts 30 are also provided in two rows parallel to each other on the frame 10. This makes it possible to hold even large and heavy steel pipes 200 and core materials 300.

[0033] When the sprocket 20 is rotated by the power shaft 40, a circulating force is applied to the rotating belt 30. In addition, the sprocket 20 to which the power shaft 40 is not connected rotates in conjunction with the movement of the rotating belt 30. This causes the steel pipes 200 and core material 300 arranged on the rotating belt 30 to rotate and be positioned at the optimal angle for each manufacturing process.

[0034] The height adjustment mechanism 50 moves the frame 10 up and down. This allows the steel pipes 200 and core material 300 arranged on the rotating belt 30 to be positioned at the optimum height for each work process. This has the role of assisting the process of inserting the core material 300 into the steel pipes 200 (described later) and assisting the worker in taking the optimum posture for each process.

[0035] The moving mechanism 61 allows the rotating jig 100 to be moved to any desired location. In addition, it can be moved with the steel pipes 200 or the core material 300 placed on the rotating belt 30. The steel pipes 200 and the core material 300 can be moved without the need for large equipment such as a crane. Therefore, the manufacture of the buckling restrained brace can be completed with the steel pipes 200 and the core material 300 left on the rotating jig 100.

[0036] Next, a manufacturing process for a buckling restrained brace using the rotating jig 100 will be described with reference to the drawings. (1st step) First, as shown in Fig. 5, the core material 300 is placed in a first jig 1000. Here, the first jig 1000 is a jig that supports the core material 300, and refers to the above-mentioned rotating jig 100 in which the frames 10 are provided at both ends in the longitudinal direction of the core material 300. The first jig 1000 may be a pair of the above-mentioned rotating jigs 100 arranged in the longitudinal direction of the core material 300, or may be one rotating jig 100 having frames 10 in two places.

[0037] As described above, the moving mechanism 61 of the rotating jig 100 is provided with commercially available casters, allowing it to move freely. Therefore, when the first jig 1000 is composed of two rotating jigs 100, the positions of the two rotating jigs 100 move automatically by placing the core material 300, even if the rotating jigs 100 are not precisely positioned before placing the core material 300. This makes it possible to easily place the core material 300.

[0038] Core material 300 comprises a first core material 310 and a second core material 320. First core material 310 penetrates the inside of steel pipe 200 in the longitudinal direction in the buckling restrained brace, with both ends protruding to the outside of steel pipe 200 (details will be described later). The width dimension of first core material 310 in the longitudinal direction of core material 300 is relatively large near both ends and relatively small in the center (particularly the portion located inside steel pipe 200).

[0039] Only one end of the second core material 320 is located inside the steel pipe 200 in the longitudinal direction of the core material 300, and the other end is located outside the steel pipe 200. The second core material 320 is provided on both sides of the first core material 310 in the thickness direction of the first core material 310. At this time, as shown in FIG. 5, the shape formed at both ends of the core material 300 by the multiple second core materials 320 is similar to that of the first core material 310 shown in FIG. 1. In this state, the first core material 310 and the second core material 320 are welded to form the core material 300. The above-mentioned welding work is performed on a first jig. In other words, placing the core material 300 on the first jig may refer to forming the core material 300 on the first jig (welding the second core material 320 to the first core material 310). The above-mentioned welding operation is preferably carried out in a state in which the width direction of first core material 310 is inclined at 45° with respect to the up-down direction, as shown in FIG.

[0040] Next, as shown in FIG. 6, the unbond material 330 is placed on the surface of the first core material 310. The unbond material 330 is preferably placed in a state where the width direction of the first core material 310 is aligned with the vertical direction. In contrast, as described above, the core material 300 is preferably formed in a state where the width direction of the first core material 310 is inclined at 45° with respect to the vertical direction. At this time, the motor provided in the rotating jig 100 is rotated to circulate the rotating belt 30. Then, as shown in FIG. 5(b) and FIG. 6(b), the core material 300 placed on the rotating belt 30 rotates in conjunction with the movement of the rotating belt 30. As a result, the core material 300 is rotated on the first jig 1000, and then the unbond material 330 is placed on the core material 300.

[0041] (2nd process) Next, as shown in FIG. 7, the core material 300 is inserted into the steel pipe 200. At this time, the first jig 1000 in which the core material 300 in which the unbond material 330 is installed in the first step is arranged and the second jig 2000 in which the steel pipe 200 is arranged are moved to approach each other. Here, the second jig 2000 is a jig that supports the steel pipe 200, and refers to the above-mentioned rotating jig 100 in which the frames 10 are provided at both ends in the longitudinal direction of the steel pipe 200. The second jig 2000 may be a pair of the above-mentioned rotating jigs 100 arranged in the longitudinal direction of the steel pipe 200, or may be one rotating jig 100 having frames 10 in two places.

[0042] The steel pipe 200 is a member located on the outside of the buckling restraint brace. In this embodiment, the steel pipe 200 has a rectangular prism shape. As shown in FIG. 7, the first jig 1000 in which the core material 300 is arranged and the second jig 2000 in which the steel pipe 200 is arranged are brought close to each other, and then the heights of the core material 300 and the steel pipe 200 are appropriately adjusted by the height adjustment mechanism 50. Then, one end of the core material 300 is inserted from an opening at one end of the steel pipe 200. Once the core material 300 is inserted into the steel pipe 200, the first jig 1000 is detached from the core material 300. As a result, as shown in FIG. 8, the steel pipe 200 and the core material 300 inserted into the steel pipe 200 are held by the second jig 2000.

[0043] (3rd step) As shown in Fig. 8, after the core material 300 is placed inside the steel pipe 200 by the second step, a filler material M is filled into the gap between the inner surface of the steel pipe 200 and the core material 300 inside the steel pipe 200. Mortar, for example, is preferably used as the filler material M. This allows the periphery of the core material 300 to be restrained by the filler material M, preventing the core material 300 from buckling. In addition, an unbond material 330 is provided at a portion of the first core material 310 that comes into contact with the filler material M, thereby preventing the generation of axial force due to friction between the first core material 310 and the filler material M.

[0044] When filling the inside of the steel pipe 200 with the filler material M, the openings at both ends of the steel pipe 200 are closed with temporary lids (not shown). After filling with the filler material M, the temporary lids are removed, and the openings at both ends of the steel pipe 200 are closed with the main lid 210. Note that instead of closing all of the openings of the steel pipe 200 with temporary lids, a part of the opening of the steel pipe 200 may be closed in advance with the divided main lid 210, and only the part not closed by the divided main lid 210 may be closed with the temporary lid, or only the main lid 210 may be used without using a temporary lid.

[0045] After the above-mentioned attachment of the main body lid 210 is completed, as shown in Fig. 9, the position of the second jig 2000 holding the steel pipe 200 is moved to hold both ends of the core material 300. In this state, the outer surface of the steel pipe 200 is painted. It is preferable to paint the steel pipe 200 from the lower side of the steel pipe 200, which is in a horizontal position. For this reason, when painting the square columnar steel pipe 200 in this embodiment, it is preferable to rotate the core material 300 by the rotating jig 100 and paint the surface to be painted facing downward. The above steps complete the manufacturing of the buckling restraint brace.

[0046] As described above, in the manufacturing method of the buckling restrained brace according to this embodiment, in the first step, after the second core material 320 is welded to the first core material 310, the core material 300 is rotated on the first jig 1000, and then the unbond material 330 is provided on the first core material 310. In other words, the core material 300 can be manufactured while being rotated on the first jig 1000. This allows the buckling restrained brace to be set at an optimal angle depending on each step of the core material manufacturing process.

[0047] Moreover, the step of inserting the core material 300 into the steel pipe 200 can be performed by moving the first jig 1000 and the second jig 2000 relatively. Therefore, the second step can be performed without moving the core material 300 and the steel pipe 200 to a predetermined location as in the conventional step. Furthermore, the core material 300 and the steel pipe 200 can be produced on the first jig 1000, and the second step can be performed in that state. In other words, the buckling restrained brace can be manufactured efficiently.

[0048] In addition, the height of the buckling restraint brace is adjusted as appropriate for each process. For example, the ideal posture of the worker may differ for each task, such as welding the core material 300 or installing the unbond material 330. In this case, by appropriately adjusting the height of the core material using the first jig 1000, the worker can always perform each process in the ideal posture. This allows the work to be performed more efficiently.

[0049] Furthermore, the inside of the steel pipe 200 placed on the first jig 1000 is filled with the filler M. In other words, the manufacturing process of the buckling restrained brace can be completed on the first jig 1000. Therefore, the buckling restrained brace can be manufactured without requiring a large space.

[0050] Furthermore, the rotating belt 30 connects the sprockets 20 provided on the U-shaped frame 10 with some slack. As a result, the rotating belt 30 has a particularly large slack in the U-shaped opening of the frame 10. When manufacturing the buckling restrained brace, for example, a core material 300 is placed on the slack in the rotating belt 30 located at this U-shaped opening. Then, the rotating belt 30 deforms to fit the shape of the buckling restrained brace. This makes it possible to hold the buckling restrained brace regardless of its shape.

[0051] Furthermore, the rotating jig 100 is movable by legs 60 having a moving mechanism 61. This allows the buckling restrained brace to be transported by the rotating jig 100. In other words, the manufacture of the buckling restrained brace can be completed while it is placed on the movable rotating jig 100, without having to move the buckling restrained brace to a different location for each process. This means that the buckling restrained brace can be manufactured efficiently without requiring a large space. In addition, the rotating belts 30 are arranged in two parallel rows, which allows the load of the buckling restraint brace to be distributed, thereby making it possible to increase the load capacity.

[0052] The frame 10 is further provided with a height adjustment mechanism 50 for adjusting the height of the frame 10. This allows the buckling restraint brace to be installed at the optimum working height for each task by adjusting the height of the frame 10.

[0053] In addition, an endless roller chain is used for the rotating belt 30. This ensures the durability of the rotating belt 30 and allows it to be used for a longer period of time.

[0054] In addition, the power shaft 40 is directly connected to one of the multiple sprockets 20. When the sprocket 20 is rotated by this power shaft 40, the rotating belt 30 circulates while deforming appropriately. This movement allows the buckling restraint brace that it holds to rotate freely. Furthermore, the moment of the power shaft 40 can be directly transmitted to the sprocket 20. This improves rotation efficiency and allows the buckling restraint brace to rotate by a single power shaft 40.

[0055] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, when the first jig 1000 and the second jig 2000 are configured by two rotating jigs 100, one of the two rotating jigs 100 does not need to be equipped with the power shaft 40. Alternatively, the movement mechanism 61 may be provided with an appropriate power source, and the control unit 44 may be provided with a function for controlling the power source, thereby allowing the movement. Furthermore, the steel pipe 200 according to this embodiment is not limited to a rectangular columnar shape, and may be, for example, a cylindrical shape.

[0056] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0057] 10 Frames 20 Sprockets 30 Rotating Belt 40 Power shaft 50 Adjustment mechanism 60 Legs 61 Moving mechanism 100 Rotating Jig 200 Steel pipe 300 Core 310 First core material 320 Second core material 330 Unbonded material 1000 First jig 2000 2nd jig M Filler

Claims

1. Steel pipes and A main body lid that closes an end of the steel pipe; A core member including: a first core member inserted into the steel pipe and made of a flat steel plate, the first core member having an end protruding from the main body lid to the outside of the steel pipe; and a second core member welded to the end of the first core member; an unbond material disposed on a surface of the first core material; A manufacturing method of a buckling restrained brace comprising: a first step of placing the first core material on a first jig, welding the second core material to the first core material, and providing the unbonded material to the first core material; A second step of moving the first jig on which the core material provided with the unbond material is disposed and the second jig on which the steel pipe is disposed so as to approach each other relatively, and inserting the core material into the steel pipe on the second jig; Equipped with In the first step, the second core material is welded to a plate surface of the first core material, the core material is rotated on the first jig, and then the unbonded material is provided on the first core material. A method for manufacturing a buckling restrained brace.

2. In the first step and the second step, the height of the core material is adjusted by the first jig, and the height of the steel pipe is adjusted by the second jig. A method for manufacturing the buckling restrained brace of claim 1.

3. In the second step, after the first jig and the second jig are brought relatively close to each other, the axial centers of the core material and the steel pipe are aligned, and then the core material is inserted into the steel pipe on the second jig. A method for manufacturing the buckling restrained brace of claim 2.

4. The method further includes a third step of filling the inside of the steel pipe placed on the second jig with the filler after the second step. A method for manufacturing a buckling restrained brace according to any one of claims 1 to 3.

5. A rotating jig used in a manufacturing method of a buckling restraint brace, A U-shaped frame including a pair of U-shaped plates facing each other; A plurality of sprockets are provided on the frame; a rotating belt that connects the plurality of sprockets with slack; a power shaft connected to one of the plurality of sprockets; A leg having a moving mechanism; Equipped with The rotating belt is provided in two rows in parallel. Rotating fixture.

6. Further, a height adjustment mechanism for adjusting the height of the frame is provided. The rotating jig according to claim 5 .

7. The rotating belt is an endless roller chain. The rotating jig according to claim 5 or 6.

8. The power shaft is directly connected to the sprocket. The rotating jig according to any one of claims 5 to 7.

9. The moving mechanism includes a plurality of casters, Each of the plurality of casters is provided with a driven wheel. The rotating jig according to any one of claims 5 to 8.

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