Corotation prevention tool, joining structure and construction method

Abstract

To provide a corotation prevention tool which can further surely reduce the corotation of a nut or a bolt which are engaged with the bolt or the nut when the bolt or the nut is fastened.SOLUTION: A corotation prevention tool of the present invention comprises a salient part being a plate-shaped part which can be attached with a bolt head part or a nut so that the bolt head part or the nut can be corotated in a circumferential direction around a center axial line of the bolt head part or the nut, protrudes to the outside of the bolt head part or the nut in a plane view along the center axial line in an attachment state that the bolt head part or the nut is attached, and is arranged so that both faces are oriented in a direction intersecting with the center axial line in the attachment state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a co-rotation prevention device, a joint structure, and an installation method. [Background technology]

[0002] For example, a technique is known for preventing nuts or bolts fitted with the bolts or nuts from rotating together when multiple structural members are fastened with bolts and nuts, as described in Patent Document 1. In this technique, an arm portion extending from a socket portion that fits into the bolt head or nut is fixed to prevent the bolts or nuts from rotating together. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-34733 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when multiple structural members are fastened with bolts and nuts, there are cases where there is no member to fasten the arm portion of Patent Document 1. In this case, even the technology described in Patent Document 1 cannot prevent the nuts or bolts from rotating together.

[0005] Therefore, an object of the present invention is to provide a co-rotation prevention device, joining structure, and construction method that can more reliably reduce the co-rotation of a nut or bolt that fits into the bolt or nut when the bolt or nut is tightened. [Means for solving the problem]

[0006] The co-rotation prevention device according to the first aspect of the present invention comprises: (1) The bolt head or the nut can be attached to the bolt head or the nut in a circumferential direction around the central axis of the bolt head or the nut so as to be rotatable together with the bolt head or the nut, This is a co-rotation prevention device that includes a protrusion that is a plate-shaped portion that protrudes outward from the bolt head or the nut when viewed in a plan view along the central axis in the installed state with the bolt head or the nut attached, and is positioned so that both sides face in a direction perpendicular to the central axis in the installed state.

[0007] As one embodiment of the present invention, a co-rotation prevention device includes: (2) A mounting portion is provided to which the bolt head or the nut can be mounted, The mounting portion is a receiving plate portion that receives an end surface of one side of the bolt head or the nut in a central axis direction along the central axis; a plurality of side plate portions that hang down from the receiving plate portion toward the other side in the central axis direction and hold the bolt head or the nut so as to restrict rotation in the circumferential direction; The anti-rotation device according to (1) above, wherein the protrusion is formed by extending from at least one of the side plate portions of the plurality of side plate portions.

[0008] As one embodiment of the present invention, a co-rotation prevention device includes: (3) The above-mentioned anti-rotation device (2) is provided with an insertion hole in the receiving plate portion through which the bolt shank portion connected to the bolt head or the bolt shank portion of the bolt fastened to the nut can be inserted.

[0009] As one embodiment of the present invention, a co-rotation prevention device includes: (4) The multiple side plate portions have an opening formed therein into which a portion of the bolt head or the nut fits when the bolt head or the nut is attached, and the bolt head or the nut abuts against the edge of the opening, thereby restricting the circumferential rotation of the bolt head or the nut. This is the co-rotation prevention device described in (2) or (3) above.

[0010] As one embodiment of the present invention, a co-rotation prevention device includes: (5) The multiple side plate portions are the anti-rotation device described in (4) above, and include multiple clamping side plate portions that radially clamp the bolt head or the nut, separate from the side plate portion with the opening.

[0011] As one embodiment of the present invention, a co-rotation prevention device includes: (6) The protrusions are provided in plurality, The plurality of protrusions include two opposed protrusions connected to two of the plurality of side plate portions and disposed opposite each other, The device for preventing co-rotation according to any one of (2) to (5) above, wherein the gap between the two opposing protrusions is open to allow the fluidized solidified material to flow in from the outside.

[0012] As one embodiment of the present invention, a co-rotation prevention device includes: (7) The multiple side plate portions include a side plate portion having an inclined portion that slopes inward and tapers toward the other side in the central axis direction, which is a co-rotation prevention device described in any one of (2) to (5) above.

[0013] A joint structure according to a second aspect of the present invention includes: (8) A structural member including a fixing plate portion having a through hole formed in a thickness direction; a fluidized solidified body in contact with one surface of the fixing plate portion; The co-rotation prevention device according to any one of (1) to (7) above, to which the bolt head or the nut is attached, The anti-rotation device is a joining structure in which it is embedded in the fluid solidified body on one side of the fixing plate portion, with the bolt shank connected to the bolt head inserted into the through hole and protruding to the other side of the fixing plate portion, or with the bolt hole of the nut and the through hole communicating with each other.

[0014] The construction method according to the third aspect of the present invention comprises the steps of: (9) A construction method in which a fluidized solidified material is filled so as to contact one side of a fixed plate portion of a structural member having a through hole formed in a thickness direction thereof, A placement step of placing the co-rotation prevention tool according to any one of (1) to (7) above, to which the nut is attached, on the one side of the fixing plate part in a state in which the bolt hole of the nut and the through hole are in communication with each other; A temporary fixing step of fastening a bolt shank of a bolt to the bolt hole of the nut through the through hole from the other side of the fixing plate portion; a filling step of filling the fluidized solidified material so as to contact the one surface of the fixing plate portion and burying the co-rotation prevention tool; a fastening release step of removing the bolt from the nut through the through hole after the fluidized solidified body has solidified; and a fixing step of placing another structural member on the other side surface of the fixing plate portion, fastening the bolt to the nut again, and fixing the other structural member to the fixing plate portion.

[0015] A construction method according to a fourth aspect of the present invention comprises the steps of: (10) A construction method in which a fluidized solidified material is filled so as to contact one side of a fixed plate portion of a structural member having a through hole formed in a thickness direction thereof, a placement step of placing the anti-rotation device according to any one of (1) to (7) above, to which the bolt head is attached, on the one side of the fixing plate in a state in which a bolt shank connected to the bolt head is inserted into the through hole and protrudes to the other side of the fixing plate; a temporary fixing step of fastening a nut to the bolt shaft portion from the other side of the fixing plate portion; a filling step of filling the fluidized solidified material so as to contact the one surface of the fixing plate portion and burying the co-rotation prevention tool; a release step of removing the nut from the bolt shank after the fluidized solidified body has solidified; This construction method includes a fixing step of placing another structural member on the other side surface of the fixing plate portion, re-tightening the nut to the bolt shank portion, and fixing the other structural member to the fixing plate portion. Effect of the Invention

[0016] According to the present invention, it is possible to provide a co-rotation prevention device, a joining structure, and a construction method that can more reliably reduce the co-rotation of a nut or bolt that fits into the bolt or nut when the bolt or nut is tightened. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a co-rotation prevention device according to a first embodiment of the present invention in a mounted state with a nut attached. [Diagram 2] 2 is a plan view showing the co-rotation prevention device of FIG. 1 in a state where a nut is attached. FIG. [Diagram 3] 2 is a side view showing the co-rotation prevention device of FIG. 1 in a state where a nut is attached. FIG. [Figure 4] 2 is a front view showing the co-rotation prevention device of FIG. 1 in a state where a nut is attached. FIG. [Diagram 5] FIG. 11 is a plan view showing a co-rotation prevention device according to a second embodiment of the present invention. [Figure 6] 6 is a side view showing the co-rotation prevention device of FIG. 5 with a nut attached. FIG. [Figure 7] 1 is a diagram showing a joint structure according to a first embodiment of the present invention; [Figure 8] FIG. 4 is a diagram showing a joint structure according to a second embodiment of the present invention. [Figure 9] 1A to 1C are diagrams showing an example of a placement step, a temporary fixing step, and a filling step of a construction method according to the present invention. [Figure 10] FIG. 11 is a diagram showing an example of a fastening release step of the construction method according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the co-rotation prevention device according to the present invention will be described by way of example with reference to the drawings. The same reference numerals are used to designate the same components in the various drawings.

[0019] FIG. 1 is a diagram showing a device 100 for preventing co-rotation as a first embodiment of the device for preventing co-rotation according to the present invention.

[0020] The co-rotation prevention device 100 can be attached to a bolt head or a nut (nut 1000 in FIG. 1, the same below) so as to be rotatable together with the bolt head or the nut in the circumferential direction around the central axis A of the bolt head or the nut. In other words, when the co-rotation prevention device 100 is in a state in which it cannot rotate around the central axis A, for example, when it is in a fixed state as shown in FIGS. 7 and 8, the bolt head 1100 or the nut 1000 attached to the co-rotation prevention device 100 cannot rotate around the central axis A either. The co-rotation prevention device 100 may be capable of attaching the bolt head or the nut by fitting, biasing, supporting, gripping, bonding, or the like.

[0021] The bolt head or nut that can be attached to the co-rotation prevention device 100 may conform to standards such as JIS.

[0022] Fig. 2 is a plan view showing the co-rotation prevention device 100 of Fig. 1. The co-rotation prevention device 100 may include a mounting portion to which a bolt head or a nut can be attached (a nut 1000 is attached in Fig. 2, the same applies below). With reference to Figs. 1 and 2, the mounting portion may include a receiving plate portion 20 and a plurality of side plate portions 11, 12, 31, and 32. In another embodiment, the mounting portion may be a triangular tube formed of three side plate portions, and a bolt head or a nut can be attached to the inside of the tube.

[0023] The receiving plate portion 20 receives an end face of the bolt head or the nut on one side in the direction of the central axis A along the central axis A. The receiving plate portion 20 may be formed with an insertion hole 20h through which a bolt shank continuing to the bolt head or a bolt shank of a bolt fastened to the nut can be inserted.

[0024] The co-rotation prevention device 100 may be biased against the bolt head or the nut in a state where the bolt head or the nut is attached. Specifically, the side plate portions 11, 12, 31, and 32 may press the outer circumferential surface of the nut 1000 by a restoring force.

[0025] The side plate portions 11, 12, 31, 32 hang down from the receiving plate portion 20 toward the other side in the direction of the central axis A, and hold the bolt head or nut so as to restrict rotation in the circumferential direction. The side plate portions may include the side plate portions 11, 12 with openings. The side plate portions 11, 12 with openings may be formed with openings 11о, 12о into which a part of the bolt head or nut (in this embodiment, two edges 1000e1, 1000e2 extending along the axis A direction on the outer peripheral surface of the nut 1000 and their vicinity) enters when the bolt head or nut is attached to the co-rotation prevention device 100. The bolt head or nut (the outer peripheral surface of the nut 1000 in FIG. 1) may come into contact with the edge portions of the openings 11о, 12о, thereby restricting rotation in the circumferential direction of the bolt head or nut.

[0026] Fig. 3 is a side view showing the co-rotation prevention tool 100 of Fig. 1 in a state where a nut 1000 is attached. Referring to Fig. 3, in this embodiment, when viewed from a direction perpendicular to the side plate portion 11 with an opening, the opening 11о is rectangular having two vertical faces facing each other along the axis A direction and two horizontal faces perpendicular to these sides. There may be no step between the lower side of the horizontal faces and the surface of the receiving plate portion 20. The nut 1000 (two of the six outer circumferential faces of the nut 1000 along the axis A direction in Fig. 3) may abut against the edge of the opening 11о along the axis A direction.

[0027] The side plate portion 12 with an opening may have a similar configuration to the side plate portion 11 with an opening.

[0028] In this embodiment, the nut 1000 is fixed between the opening side plate portions 11, 12. Specifically, referring to FIG. 1, two of the six outer peripheral surfaces of the nut 1000 along the axis A direction may abut against an edge of the opening 11о of the opening side plate portion 11 along the axis A direction. The other two of the six outer peripheral surfaces of the nut 1000 along the axis A direction may abut against an edge of the opening 12о of the opening side plate portion 12 along the axis A direction. The surface of the nut 1000 opposite to the receiving plate portion 20 may abut against an edge of the openings 11о, 12о of the opening side plate portions 11, 12 opposite to the receiving plate portion 20 (the upper edge 11оu of the opening 11о in FIG. 3).

[0029] 3, the side plate portions 11, 12 may be tapered toward the other side (upward in FIG. 3) in the direction of the central axis A. The upper ends of the side plate portions 11, 12 may be chamfered.

[0030] Fig. 4 is a front view showing the co-rotation prevention device 100 of Fig. 1 in a state where a nut 1000 is attached. With reference to Fig. 4, the side plate portions 11, 12 may include inclined portions 11t1, 12t1 that incline inward toward the other side (upper end in Fig. 4) in the direction of the central axis A. In other words, the side plate portions 11, 12 may be bent inward (in the direction in which the side plate portions 11, 12 approach each other) at the end portion on the other side (the upper end portion in Fig. 1).

[0031] The side plate portions 11, 12 may include, on the other (upper in FIG. 4) side of the inclined portions 11t1, 12t1, further inclined portions 11t2, 12t2 inclined outwardly toward the other side in the direction of the central axis A. In other words, with reference to FIG. 1, the side plate portions 11, 12 may be inclined outwardly at the end portion on one side (the upper end portion in FIG. 1). With this configuration, the bolt head or nut can be easily attached by the co-rotation prevention device.

[0032] The multiple side plate portions may include multiple clamping side plate portions 31, 32 that clamp the bolt head or nut in the radial direction, in addition to the opening-equipped side plate portions 11, 12. The multiple clamping side plate portions 31, 32 may extend along a part of the outer circumferential surface of the bolt head or nut (one surface in FIG. 1) in a state in which the bolt head or nut is attached to the co-rotation prevention device 100. The upper end portions of the clamping side plate portions 31, 32 may be chamfered.

[0033] The rotation prevention device 100 has a protruding portion that protrudes outward from the bolt head or nut (nut 1000 in FIG. 2, the same applies below) in a plan view (FIG. 2) taken along the central axis A in an attached state in which the bolt head or nut is attached. Specifically, in FIG. 2, the portion of the rotation prevention device 100 located radially outward from the nut 1000 is the protruding portion. The protruding portion includes plate-like portions 11, 12 that are arranged so that both surfaces face in a direction perpendicular to the central axis A (direction along the paper surface of FIG. 2) in the attached state. The protruding portion may further include clamping side plate portions 31, 32.

[0034] The protruding portion may be formed by extending from at least one of the side plate portions (in this embodiment, the plate-shaped portions 11 and 12).

[0035] A plurality of protrusions may be provided. Referring to FIG. 1, the plurality of protrusions may include two opposing protrusions 11p1, 11p2, 12p1, and 12p2 connected to two of the plurality of side plate portions 11 and 12 and arranged opposite to each other. The receiving plate portion 20 may have notches 20n1 and 20n2 formed on the opposite side of the nut 1000 of the clamping side plate portions 31 and 32. The notches 20n1 and 20n2 may extend to the front end 11e1, 12e1 or 11e2, 12e2 of the opposing protrusions before the clamping side plate portions 31 and 32. The gap between the two opposing protrusions 11p1, 12p1 or 11p2, 12p2 may be open so that the fluidized solidified body can flow in from the outside. In other words, referring to FIG. 1, the tip ends 11e1, 11e2, 12e1, 12e2 sides of the two opposing protrusions 11p1, 12p1 or 11p2, 12p2 and both sides in the direction of the central axis A may be open.

[0036] 5 is a plan view showing a co-rotation prevention device 200 as a second embodiment of the co-rotation prevention device according to the present invention. In the following, the same configuration as that of the co-rotation prevention device 100 will not be described again, and configurations different from those of the co-rotation prevention device 100 will be described.

[0037] The co-rotation prevention device 200 can be attached to a bolt head or a nut (nut 1000 in FIG. 5, the same below) so as to be rotatable together with the bolt head or the nut in the circumferential direction around the central axis A' of the bolt head or the nut.

[0038] The co-rotation prevention device 200 may include a mounting portion to which a bolt head or a nut can be attached (a nut 1000 is attached in FIG. 5, the same applies below). With reference to FIG. 5, the mounting portion may include a receiving plate portion 220 and a plurality of side plates 211, 212, 231, 232, 233, and 234.

[0039] The multiple side plate portions 211, 212, 231, 232, 233, 234 hang down from the receiving plate portion 220 toward the other side in the direction of the central axis A' (perpendicular to the plane of the paper in FIG. 5 toward the reader) and hold the bolt head or nut so as to restrict rotation in the circumferential direction. The side plate portions 211, 212, 231, 232, 233, 234 form a hexagonal shape in which a gap is formed between the side plate portions 231, 233 and between the side plate portions 232, 234 in a plan view along the central axis A'.

[0040] The rotation prevention device 200 may further include a wing portion 241 disposed between the side plate portions 231 and 233, and a wing portion 242 disposed between the side plate portions 232 and 234. The rotation prevention device 200 can be used as a wing bolt or a wing nut in an attached state in which a bolt head or a nut is attached.

[0041] The co-rotation prevention device 200 may be box-shaped. More specifically, the side plate portions 211, 212, 231, 232, 233, and 234 and the wing portions 241 and 242 may form the side surfaces of the box. The receiving plate portion 220 may form the bottom surface of the box. The box may be open to allow the fluidized solidified material to flow in from the outside in a mounted state in which the bolt heads or nuts are mounted.

[0042] The receiving plate portion 220 receives an end face on one side in the direction of the central axis A' of the bolt head or the nut. The receiving plate portion 220 may be formed with an insertion hole 220h through which a bolt shank continuing to the bolt head or a bolt shank of a bolt fastened to the nut can be inserted.

[0043] In this embodiment, the nut 1000 is fixed between the side plate portions 211, 212, 231, 232, 233, and 234. Specifically, with reference to Fig. 5 and Fig. 6, the side plate portions 211, 212, 231, 232, 233, and 234 may abut against six outer circumferential surfaces of the nut 1000 along the axis A' direction. Furthermore, the co-rotation prevention device 200 may include claw portions 251, 252, 253, and 254 that abut against an upper surface (the surface opposite to the surface abutting against the receiving plate portion 220) located at one end of the nut 1000 in the axis A' direction.

[0044] The claw portions 251, 252, 253, and 254 may extend from the side plate portions 231, 232, 233, and 234, respectively. The claw portions 251, 252, 253, and 254 may extend along the central axis A' before the bolt head or the nut is attached to the rotation prevention device 200. The claw portions 251, 252, 253, and 254 may be bent so as to abut against the upper surface of the nut 1000 when the bolt head or the nut is attached to the rotation prevention device 200.

[0045] Fig. 6 is a side view showing the rotation prevention device 200 of Fig. 5 in a state where the nut 1000 is attached. As shown in Fig. 6, the wings 241, 242 may be curved toward the other side (upward in Fig. 6) in the direction of the central axis A'. The upper edges 241u, 242u of the wings 241, 242 may be positioned higher than the upper edges of the side plate portions 211, 212, 231, 232. The wings 241, 242 may be held by an operator when the rotation prevention device 200 is fastened as a wing bolt or a wing nut.

[0046] The rotation prevention device 200 has a protruding portion that protrudes outward from the bolt head or nut (nut 1000 in FIG. 5, the same applies below) in a plan view (FIG. 5) taken along the central axis A' in a mounted state in which the bolt head or nut is mounted. In FIG. 5, a portion of the rotation prevention device 200 located radially outward from the nut 1000 is the protruding portion. The protruding portion may be connected to at least one side plate portion of the multiple side plate portions. The protruding portion may include wing portions 241, 242 connected to the side plate portions 231, 232, 233, 234.

[0047] The rotation prevention device 100, 200 of the present embodiment configured as described above includes the plate-shaped parts 11, 12, 211, 31, 32, 231, 232 arranged so that both sides face in a direction perpendicular to the central axis A, A' when the bolt head or nut is attached. When the fluidized solidified body 2200 flows around the rotation prevention device 100, 200, both sides of the plate-shaped parts 11, 12, 211, 31, 32, 231, 232 are embedded in the fluidized solidified body 2200. Therefore, when a moment about the central axis A, A' is applied to the rotation prevention device 100, 200, the force is applied from the fluidized solidified body 2200 to both sides of the plate-shaped parts 11, 12, 211, 31, 32, 231, 232 facing in a direction perpendicular to the central axis A, A', so that the moment can be effectively canceled. As a result, both the anti-rotation device 100, 200 and the bolt head 1100 or the nut 1000 attached to the anti-rotation device 100 can be prevented from rotating about the central axis A.

[0048] 7 is a diagram showing a joint structure 2000 as a first embodiment of the joint structure according to the present invention. The joint structure 2000 includes structural members 2110, 2120, a fluidized solidified body 2200, and a co-rotation prevention device 100. The joint structure may include a co-rotation prevention device 200 instead of or in addition to the co-rotation prevention device 100.

[0049] The structural member 2110 may be a base material such as a steel concrete beam. The structural member 2110 may be an H-shaped steel. The structural member 2120 may be a sub-member such as a pillar. The structural member 2110 includes a fixing plate portion 2111 having a through hole formed in the thickness direction. The fixing plate portion 2111 may be a flange. The structural member 2120 may also be formed with a similar fixing plate portion 2121.

[0050] The fluidized solidified body 2200 may be concrete, mortar, resin, etc. The fluidized solidified body 2200 contacts one surface of the fixed plate part 2111 (the lower surface of the fixed plate part 2111 in FIG. 7). The fixed plate part 2111 may be entirely or almost entirely embedded in the fluidized solidified body 2200.

[0051] A bolt head 1100 or a nut 1000 is attached to the co-rotation prevention device 100. The receiving plate portion 20 of the co-rotation prevention device 100 may abut against the lower surface of the fixing plate portion 2111 of the structural member 2110. The entirety or substantially the entirety of the co-rotation prevention device 100 may be embedded in the fluidized solidified body 2200.

[0052] The co-rotation prevention device 100 may be embedded in the fluidized solidified body 2200 in a state in which the bolt shank 1100s connected to the bolt head 1100 is inserted into the through-hole of the fixing plate 2111 and protrudes to the other side of the fixing plate 2111. The bolt shank 1100s may be fastened to a nut 1300 on the other side of the fixing plate 2111.

[0053] The co-rotation prevention device 100 may be embedded in the fluidized solidified body 2200 with the nut 1000 communicating with the through hole of the fixing plate part 2111. A bolt 1200 may be fastened to the nut 1000, the bolt 1200 being inserted from one side into the through hole of the fixing plate part 2111 and protruding to the other side of the fixing plate part 2111.

[0054] 8 is a diagram showing a joint structure 3000 as a second embodiment of the joint structure according to the present invention. Hereinafter, the same configuration as the joint structure 2000 will not be described again, and only the configuration different from the joint structure 2000 will be described.

[0055] The joint structure 3000 includes structural members 3110 and 3120 , a fluidized solidified body 2200 , and a co-rotation prevention device 100 .

[0056] The structural member 3110 may be a pillar. The structural member 3110 may be a square pipe. The structural member may be a circular pipe. The inside of the structural member 3110 may be filled with the fluidized solidified material 2200. The structural member 3110 may be a concrete filled steel pipe (CFT) structure. The structural member 3110 includes a fixing plate portion 3111 having a through hole formed in the thickness direction.

[0057] The structural member 3120 may be a beam. The structural member 3110 and the structural member 3120 may extend in directions perpendicular to each other.

[0058] An embodiment of the construction method according to the present invention will be described below. By the construction method, the fluidized solidified material is filled so as to contact one side of the fixed plate part in which a through hole is formed in the thickness direction of the structural member. Here, the construction direction for the structural members 2110, 2120 shown in FIG. 7 will be described, but the construction method of the present invention can also be applied to other structural members according to the present invention, such as the structural members 3110, 3120 shown in FIG. 8. In addition, the construction method using the co-rotation prevention tool 100 will be described, but the construction method of the present invention can be carried out even if other co-rotation prevention tools such as the co-rotation prevention tool 200 are used. In addition, in the embodiment shown below, the co-rotation prevention tool 100 to which the nut 1000 is attached and the co-rotation prevention tool 100 to which the bolt head 1100 is attached are used, but only one of them may be used.

[0059] The construction method includes a placement step, a temporary fixing step, a filling step, a fastening release step, and a fixing step.

[0060] The arrangement step will be described below with reference to Fig. 9. The rotation prevention device 100 with the nut 1000 attached thereto is arranged on one side of the fixing plate 2111 (the lower side of Fig. 9) in a state in which the bolt hole of the nut 1000 and the through hole of the fixing plate 2111 communicate with each other. Alternatively, the rotation prevention device 100 with the bolt head 1100 attached thereto is arranged on one side of the fixing plate 2111 in a state in which the bolt shank 1100s connected to the bolt head 1100 is inserted into the through hole and protrudes to the other side of the fixing plate 2111 (the upper side of Fig. 9).

[0061] The temporary fixing step will be described below. The bolt shank 1200s of the bolt 1200 is fastened to the bolt hole of the nut 1000 through the through hole of the fixing plate 2111 from the other side (upper side in FIG. 9) of the fixing plate 2111 of the structural member 2110. Alternatively, the nut 1300 is fastened to the bolt shank 1100s from the other side of the fixing plate 2111. By performing the temporary fixing step, the co-rotation prevention device 100 can be fixed to the fixing plate 2111. This can prevent the co-rotation prevention device 100 or the bolt head or nut attached to the co-rotation prevention device 100 from moving even if shock, vibration, or the like is applied to them in the subsequent work.

[0062] The filling step will be described below. When the filling step is performed, a formwork may be placed around the structural member 2110. The fluidized solidified body 2200 is filled so as to contact one side (the lower side in FIG. 9 ) of the fixed plate portion 2111 of the structural member 2110, and the co-rotation prevention device 100 is embedded. When the filling step is completed, in this embodiment, the fluidized solidified body 2200 flows around the co-rotation prevention device 100, and both sides of the plate-shaped portions 11 and 12 of the co-rotation prevention device 100, both sides of the clamping side plate portions 31 and 32, and the lower surface of the receiving plate portion 20 are embedded in the fluidized solidified body 2200.

[0063] The fastening release step will be described below with reference to FIG. 10. After the fluidized solidified body 2200 has solidified, the bolt 1200 is removed from the nut 1000 through the through hole of the fixing plate portion 2111. Since the fluidized solidified body 2200 has solidified, a hole 2200h having a thread may be formed in the fluidized solidified body 2200 after the bolt 1200 is removed. Alternatively, after the fluidized solidified body 2200 has solidified, the nut 1300 is removed from the bolt shank portion 1100s. When the fastening release step is completed, the rotation prevention device 100 and the bolt head 1100 or nut 1000 attached to the rotation prevention device 100 are prevented from rotating around the central axis A.

[0064] The fixing step will be described below with reference to Fig. 7. Another structural member 2120 is placed on the surface of the other side (upper side of Fig. 7) of the fixing plate portion 2111, the bolt 1200 is fastened again to the nut 1000, and the other structural member 2120 is fixed to the fixing plate portion 2111. Alternatively, another structural member 2120 (more specifically, the fixing plate portion 2121) is placed on the surface of the other side of the fixing plate portion 2111, the nut 1300 is fastened again to the bolt shank portion 1100s, and the other structural member 2120 is fixed to the fixing plate portion 2111. In this step, when the bolt 1200 or the nut 1300 is tightened, the nut 1000 or the bolt head portion 1100 fitted to the bolt 1200 or the nut 1300 may be prevented from rotating together. [Explanation of symbols]

[0065] 100,200: Anti-rotation device 11, 12, 211, 31, 32, 231, 232: Side plate part (plate-shaped part) 11о,12о: opening 11th: Edge 11e1: Tip 11p1: Opposing protrusion 11t1,11t2: Inclined part 20,220: Receiving plate 20h, 220h: Through hole 20n1, 20n2: Notch 241,242: Wing part 241u:En 251, 252, 253, 254: Claws 1000: Nut 1000e1: Edge 1100: Bolt head 1100s: Bolt shaft 1200:Bolt 1200s: Bolt shaft 1300: Nut 2000,3000:Joint structure 2110, 2120, 3110, 3120: Structural members 2111,2121,3111: Fixed plate part 2200: Fluidized solid 2200h: hole A, A’: Axis

Claims

1. The bolt head or the nut can be attached to the bolt head or the nut in a circumferential direction around the central axis of the bolt head or the nut so as to be rotatable together with the bolt head or the nut, A co-rotation prevention device comprising a protrusion which is a plate-shaped portion that protrudes outward from the bolt head or the nut when viewed in a plan view along the central axis in an installed state with the bolt head or the nut attached, and is arranged so that both surfaces face in a direction perpendicular to the central axis in the installed state.

2. A mounting portion is provided to which the bolt head or the nut can be mounted, The mounting portion is a receiving plate portion that receives an end surface of one side of the bolt head or the nut in a central axis direction along the central axis; a plurality of side plate portions that hang down from the receiving plate portion toward the other side in the central axis direction and hold the bolt head or the nut so as to restrict rotation in the circumferential direction; The rotation prevention device according to claim 1 , wherein the protrusion is formed by extending from at least one of the side plate portions.

3. The co-rotation prevention device according to claim 2, wherein the receiving plate portion has an insertion hole through which a bolt shank portion connected to the bolt head or a bolt shank portion of a bolt fastened to the nut can be inserted.

4. 3. The anti-rotation device according to claim 2, wherein the plurality of side plate portions have an opening formed therein into which a portion of the bolt head or the nut enters when the bolt head or the nut is attached, and the bolt head or the nut abuts against an edge of the opening, thereby restricting the circumferential rotation of the bolt head or the nut.

5. The co-rotation prevention device according to claim 4 , wherein the plurality of side plate portions include a plurality of clamping side plate portions that clamp the bolt head or the nut in a radial direction, in addition to the side plate portion with the opening.

6. The protrusions are provided in plurality, The plurality of protrusions include two opposed protrusions connected to two of the plurality of side plate portions and disposed opposite each other, The device for preventing co-rotation according to claim 2 , wherein the gap between the two opposed protruding portions is open to allow the fluidized solidified material to flow in from the outside.

7. The rotation prevention device according to claim 2 , wherein the plurality of side plate portions include a side plate portion having an inclined portion that is inclined inwardly and tapered toward the other side in the central axis direction.

8. A structural member including a fixing plate portion having a through hole formed in a thickness direction; a fluidized solidified body in contact with one surface of the fixing plate portion; The co-rotation prevention device according to claim 1 or 2, to which the bolt head or the nut is attached, A joining structure in which the anti-rotation device is embedded in the fluid solidified body on one side of the fixing plate portion, with the bolt shank connected to the bolt head inserted into the through hole and protruding to the other side of the fixing plate portion, or with the bolt hole of the nut and the through hole communicating with each other.

9. A construction method in which a fluidized solidified material is filled so as to contact one side of a fixed plate portion of a structural member having a through hole formed in a thickness direction thereof, A placement step of placing the co-rotation prevention tool according to claim 1 or 2, to which the nut is attached, on the one side of the fixing plate part in a state in which the bolt hole of the nut and the through hole are in communication with each other; A temporary fixing step of fastening a bolt shank of a bolt to the bolt hole of the nut through the through hole from the other side of the fixing plate portion; a filling step of filling the fluidized solidified material so as to contact the one surface of the fixing plate portion and burying the co-rotation prevention tool; a fastening release step of removing the bolt from the nut through the through hole after the fluidized solidified body has solidified; and a fixing step of placing another structural member on the other side surface of the fixing plate portion, fastening the bolt to the nut again, and fixing the other structural member to the fixing plate portion.

10. A construction method in which a fluidized solidified material is filled so as to contact one side of a fixed plate portion of a structural member having a through hole formed in a thickness direction thereof, a placement step of placing the anti-rotation device according to claim 1 or 2, to which the bolt head is attached, on the one side of the fixing plate part in a state in which a bolt shank connected to the bolt head is inserted into the through hole and protrudes to the other side of the fixing plate part; a temporary fixing step of fastening a nut to the bolt shaft portion from the other side of the fixing plate portion; a filling step of filling the fluidized solidified material so as to contact the one surface of the fixing plate portion and burying the co-rotation prevention tool; a release step of removing the nut from the bolt shank after the fluidized solidified body has solidified; and a fixing step of placing another structural member on the other side surface of the fixing plate portion, fastening the nut to the bolt shank again, and fixing the other structural member to the fixing plate portion.

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