Brace attachment structure

Abstract

To provide a brace attachment structure that can attach braces either parallel or perpendicular to a longitudinal direction of a structural member, and can impart high seismic resistance and workability to suspended ceilings.SOLUTION: In a brace attachment structure for attaching a brace 8 to a structural member 2 with a cross-sectional H-shape via an attachment bracket 10, the attachment bracket comprises: a base member 11 having a rectangular shape in plan view that contacts a lower surface of a flange portion 2b of the structural member; four clamping members 12 positioned above corner portions of the base member and cooperating with the base member to clamp the flange portion of the structural member; a fastening member 14 for fastening the corner portions of the base member and the clamping members; and a brace attachment portion 20 fixed to a lower surface of the base member.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a brace mounting structure for mounting braces to improve the strength and earthquake resistance of a suspended ceiling. [Background technology]

[0002] BACKGROUND ART Conventionally, a suspended ceiling is known to have a structure in which ceiling panels are installed via ceiling material support members arranged in a grid pattern and connected to the lower ends of suspension bolts that are suspended from the building frame. In this type of suspended ceiling, a structure is known in which braces are attached via metal fittings to an H-shaped cross-section structure fixed to the main body in order to increase strength against lateral shaking that occurs during an earthquake (see, for example, Patent Documents 1 and 2).

[0003] Patent Document 1 discloses a structure in which a first plate member arranged on the underside of a flange portion of the structure having an H-shaped cross section, a pair of second plate members arranged on both sides of the upper surface of the flange portion in the width direction, and a pair of spacers arranged between the first and second plate members are fastened together by fastening means such as bolts and nuts that pass through a plurality of holes formed in the first plate member, the second plate member, and the spacers, and in which a brace is connected using the bolts and nuts to a vertical plate-shaped connecting portion welded to the underside of the first plate member arranged on the underside of the flange. In this case, because the connecting portion is provided along the longitudinal direction of the structure, the brace is attached in the longitudinal direction of the structure, i.e., parallel to it (hereinafter referred to as the parallel direction).

[0004] Patent Document 2 discloses a reinforcement structure in which a roughly U-shaped flange support part having a pair of clamping parts that sandwich the flange of an existing H-shaped steel is provided on the outer surface of the flange support part and fixed to the tip of a brace connecting part that reinforces the clamping of the flange by the flange support part. As a result, a brace is attached to the short side direction of the H-shaped steel, i.e., the orthogonal direction (hereinafter referred to as the orthogonal direction). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-48714 [Patent Document 2] Japanese Patent Application Publication No. 2022-178889 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the structure described in Patent Document 1, the first plate member, the pair of second plate members, and the pair of spacers are fastened by fastening means such as bolts and nuts that pass through multiple holes aligned with each other. Therefore, careful attention is required when attaching the first plate member to the structure. Furthermore, since the first plate member is fixed parallel to the longitudinal direction of the structure, and the brace connected to the connecting portion welded to the underside of the first plate member is attached parallel to the structure, the brace cannot be attached perpendicular to the longitudinal direction of the structure. While it is possible to attach the brace perpendicular to the longitudinal direction of the structure by welding the connecting portion to the underside of the first plate member so that it is perpendicular to the longitudinal direction of the structure, this creates a trade-off problem: the brace cannot be attached parallel to the longitudinal direction of the structure.

[0007] In the structure described in Patent Document 2, the brace is attached to the outer surface of a roughly U-shaped flange support part that has a pair of clamping parts that sandwich the flange of the H-shaped steel, so the brace can be attached in a direction perpendicular to the longitudinal direction of the H-shaped steel, but cannot be attached parallel to the longitudinal direction of the H-shaped steel.

[0008] This invention was made in consideration of the above circumstances, and its object is to provide a brace mounting structure that allows braces to be mounted either parallel or perpendicular to the longitudinal direction of the structure, and that can impart high earthquake resistance and ease of installation to suspended ceilings. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention provides a brace mounting structure for mounting a brace to a structure with an H-shaped cross section via mounting brackets, characterized in that the mounting brackets include a base material that is rectangular in plan view and whose upper surface abuts the underside of the flange portion of the structure, four clamping members that are positioned above the corners of the base material and cooperate with the base material to clamp the flange portion of the structure, fastening members that fasten the corners of the base material to the clamping members, and a brace mounting portion that is fixed to the underside of the base material (Claim 1).

[0010] By configuring it in this manner, the base material, which is rectangular in plan view and abuts the underside of the flange portion of the structure, and the four clamping members arranged above the corners of the base material can be fastened together with fastening members, so that the base material can be attached in either a direction parallel to or perpendicular to the longitudinal direction of the structure by similar construction.

[0011] In this invention, it is preferable that the brace mounting portion has a fixing portion attached to the underside of the base material and a pair of support portions extending downward from the fixing portion at a distance, and that the brace is supported by the support portions so as to be rotatable in the vertical direction (Claim 2).In this case, it is preferable that a brace connecting fitting is supported by the support portions of the brace mounting portion so as to be rotatable in the vertical direction, and that the brace is connected to the brace connecting fitting with the brace mounting portion fixed to the underside of the flange portion of the structure (Claim 3).

[0012] With this configuration, the brace is supported rotatably in the vertical direction by a pair of support parts that constitute the brace mounting part, which is fixed to the underside of the base material, thereby rotatably attaching the brace to the structure. In this case, the brace connection fitting is supported rotatably in the vertical direction by the support parts of the brace mounting part, and the brace is connected to the brace connection fitting with the brace mounting part fixed to the underside of the flange part of the structure, thereby allowing the brace connection fitting to be supported rotatably in the vertical direction by the support parts of the brace mounting part and formed into a unit. Furthermore, with the unitized brace mounting part connected to the underside of the flange part of the structure, the brace can be connected to the brace connection fitting. This facilitates brace installation during construction and allows for easy adjustment of the brace angle.

[0013] Furthermore, in this invention, it is acceptable to make the clamping members thicker to give them strength, but it is preferable to interpose spacers that abut against the outer surfaces of the flange portions of the structure between the corners of the base material and the four clamping members, and to fasten the base material and the clamping members with the spacers interposed (Claim 4).

[0014] With this configuration, the base material and the four clamping members can be firmly fastened together with the spacers interposed between the corners of the base material and the four clamping members.

[0015] In addition, in this invention, it is preferable that the clamping member has an abutment portion that abuts against the upper surface of the flange portion of the structure and a step portion that abuts against the outer surface of the flange portion, which are integrally formed (claim 5).

[0016] By configuring it in this manner, the abutment portions of the four clamping members arranged above the corners of the base material abut against the upper surface of the flange portion, and the step portions abut against the outer surface of the flange portion, making it easy to position the base material and the clamping members and also enabling them to be firmly fastened together even in the event of shaking caused by earthquakes, etc.

[0017] In addition, in this invention, it is preferable that the clamping member is formed from a plate material that is approximately rectangular in a plan view, the fastening member is composed of a bolt that penetrates perpendicularly into the clamping member and the base material and a nut that screws onto the bolt, and that a portion of the clamping member that is offset from the center in the longitudinal direction is rotatable in the axial direction of the bolt, and that in the fastened state, the longer side of the clamping member from the rotating portion abuts against the inner side of the flange portion (Claim 6).

[0018] With this configuration, the longer side of the clamping member from the pivoting portion abuts against the inner side of the flange portion, increasing the contact area between the clamping member and the flange portion, enabling the flange portion to be securely clamped. Furthermore, because the clamping member can rotate in the axial direction of the bolt that constitutes the fastening member, it can exert the effect of securely clamping the flange portion in both directions parallel and perpendicular to the longitudinal direction of the structure.

[0019] In addition, in this invention, a plurality of micro-particles having a high hardness relative to the structure and the base material are arranged on the fastening portion side of the fastening member between the underside of the flange portion of the structure and the upper surface of the base material, and it is preferable that the micro-particles are embedded in each of the base material and the flange portion when the flange portion, the base material, and the clamping member are fastened by the fastening member (Claim 7).

[0020] By configuring it in this manner, multiple micro-particles are placed on the fastening portion side of the fastening member between the underside of the flange portion of the structure and the upper surface of the base material, and when the flange portion, base material, and clamping member are fastened together by the fastening member, the micro-particles become embedded in the base material and flange portion, thereby preventing the mounting fixture from shifting out of position. [Effects of the Invention]

[0021] According to this invention, as configured as described above, the braces can be attached either parallel or perpendicular to the longitudinal direction of the structure, thereby imparting high earthquake resistance and ease of construction to the suspended ceiling. Furthermore, the brace is supported so that it can rotate vertically on a pair of support parts that form the brace mounting part fixed to the underside of the base material, so that the brace is rotatably attached to the structure, making it easy to adjust the angle of the brace during construction and also able to absorb shaking caused by earthquakes, vibrations, etc. [Brief explanation of the drawings]

[0022] [Figure 1] 1A is a schematic plan view of a first embodiment of a brace mounting structure according to the present invention, and FIG. 1B is an enlarged view of a portion I in FIG. 1A. [Figure 2] 1A is a schematic front view of the first embodiment, and FIG. 1B is an enlarged view of a portion II in FIG. 1A. [Figure 3] 1A is a front view showing a brace mounting state in the first embodiment, and FIG. 1B is an enlarged side view thereof. [Figure 4] FIG. 4 is an enlarged front view showing a cross section of a part of the main part of FIG. [Figure 5] FIG. 4 is an enlarged side view showing a cross section of a part of the main part of FIG. 3(b). [Figure 6] 6A is an enlarged cross-sectional view taken along line III-III in FIG. 5, and FIG. 6B is an enlarged cross-sectional view of part IV in FIG. [Figure 7] FIG. 2 is a perspective view showing the attached state of the mounting bracket in the first embodiment. [Figure 8] FIG. 2 is an exploded perspective view showing the state before the mounting bracket in the first embodiment is mounted. [Figure 9] FIG. 10 is an enlarged side view showing, in cross section, part of a main part of a brace mounted state using a modified clamping member that constitutes the mounting bracket of the present invention. [Figure 10] FIG. 10 is a perspective view showing the attached state of the mounting bracket shown in FIG. 9. [Figure 11] FIG. 10 is an exploded perspective view showing the state before the mounting bracket shown in FIG. 9 is attached. [Figure 12] 10A is a schematic plan view of a second embodiment of the brace mounting structure according to the present invention, and FIG. 10B is an enlarged view of a V portion of FIG. [Figure 13] FIG. 10 is a schematic side view of the second embodiment. [Figure 14] 10A and 10B are a front view and a side view showing a brace mounting state in a second embodiment. [Figure 15] FIG. 15 is an enlarged front view showing a cross section of a part of the main part of FIG. 14(a). [Figure 16] FIG. 14(b) is an enlarged side view showing the main part of FIG. [Figure 17] FIG. 10 is a perspective view showing the attached state of the mounting bracket in the second embodiment. [Figure 18] FIG. 10 is an exploded perspective view showing the state before the mounting bracket in the second embodiment is mounted. DETAILED DESCRIPTION OF THE INVENTION

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0024] First Embodiment As shown in Figures 1 and 2, the suspended ceiling having a brace mounting structure according to the present invention has a structure in which ceiling panels 3 are installed on ceiling material support members 4 arranged in a grid pattern and suspended by suspension bolts (not shown) suspended from the skeleton 1 of a building. In Figure 1, the longitudinal direction of the structure 2 is designated X, and the lateral direction (width direction) of the structure 2 is designated Y. In the following description, the height direction of the structure 2 is designated Z.

[0025] In this suspended ceiling, to increase the strength against lateral shaking that occurs during an earthquake, braces 8, one end of which is rotatably supported by mounting brackets 10 attached to a structural body 2 with an H-shaped cross section that is fixed to a skeleton 1, have their lower ends connected to lower mounting brackets 5 fixed to a ceiling panel 3. In this case, the braces 8 are formed from rectangular tubular members and are attached in a direction parallel to the longitudinal direction of the structural body 2.

[0026] The ceiling panel 3 is formed of a heat-insulating panel consisting of a pair of rectangular surface plates 3a, frame members 3b interposed between each side of the surface plates 3a, 3a, and a heat-insulating core member 3c filled in the space formed by the surface plates 3a and the frame members 3b. The ceiling panel 3 is supported at both ends perpendicular to its longitudinal direction by ceiling material support members 4, and is positioned so as to fill the space between the ceiling material support members 4.

[0027] The lower mounting bracket 5 is fixed to the ceiling panel 3 configured as described above with fixing screws 7. A plurality of small screw holes 5a are provided at predetermined intervals in the longitudinal and widthwise areas of the brace 8 in the lower mounting bracket 5. The lower end of the brace 8 is fixed by screwing with a fixing screw 6 that passes through any of the small screw holes 5a.

[0028] As shown in Figures 3, 7 and 8, the structure 2 fixed to the skeleton 1 is formed of H-shaped steel with an H-shaped cross section, consisting of an upper flange 2a and a lower flange 2b that face each other from above and below, and a web 2c that connects them. After the structure 2 is placed, concrete is poured into the structure 2 to fix it to the skeleton 1, and one end of the brace 8 is supported so as to be rotatable in the vertical direction via a mounting bracket 10 attached to the lower flange 2b of the structure 2.

[0029] The mounting bracket 10 comprises a base material 11 that is rectangular in plan view and whose upper surface abuts against the underside of the lower flange portion 2b (hereinafter referred to as flange portion 2b) of the structural body 2, four clamping members 12 that are positioned above the corners of the base material 11 and cooperate with the base material 11 to clamp the flange portion 2b of the structural body 2, fastening members 14 that fasten the corners of the base material 11 to the clamping members 12, and a brace mounting portion 20 that is fixed to the underside of the base material 11. The fastening members 14 are composed of a bolt 15 and a double nut, i.e., two long nuts 16, that thread onto the bolt 15.

[0030] The base material 11 has four corners provided with through holes 11a through which bolts 15 of the fastening members 14 pass. As shown in Fig. 8, the brace mounting portion 20 is fixed to the underside of the center of the base material 11 with six flat head fixing screws 21. By forming the fixing screws 21 as flat head screws, the heads of the fixing screws 21 do not protrude from the top surface of the base material 11, and can be abutted against the underside of the flange portion 2b without leaving a gap between the base material 11 and the base material 11.

[0031] The brace mounting part 20 has a rectangular fixing part 20a that is attached to the underside of the base material 11 with a fixing screw 21, and a pair of support parts 20b that extend downward at a distance from the fixing part 20a. The support parts 20b are formed in an inclined shape that decreases in height from one end to the other in the longitudinal direction, and a brace connecting fitting 22 is rotatably supported by a bolt 24 that is inserted into a through hole 20c provided on one end of the support part 20b. One end of the brace 8 is inserted into a rectangular hollow part provided in the brace connecting fitting 22, and the brace 8 is connected to the brace connecting fitting 22 with a fixing screw 23 formed by a tapping screw.

[0032] When attaching the brace connecting fitting 22 to the brace mounting portion 20, the brace mounting portion 20 and the brace connecting fitting 22 are assembled into a unit by threading a nut 25 onto a bolt 24 that is inserted into a through hole 20c provided in the support portion 20b and a through hole (not shown) provided in the brace connecting fitting 22. At this time, in order to prevent the spacing between the support portions 20b from narrowing, a cylindrical spacer 26, through which the bolt 24 passes, is interposed between the support portions 20b (see FIG. 5).

[0033] The clamping member 12, which is disposed above a corner of the base material 11, is formed from a plate material that is generally rectangular in plan view, and has a through hole 12a formed in a portion offset from the center in the longitudinal direction. The clamping member 12 is rotatable in the axial direction of the bolt 15 that constitutes the fastening member 14, and in the fastened state, the longer side of the clamping member 12 from the rotating portion can abut against the inner side of the flange portion 2b. In this way, in the fastened state, the longer side of the clamping member 12 from the rotating portion abuts against the inner side of the flange portion 2b, increasing the contact area between the clamping member 12 and the flange portion 2b, and enabling the flange portion 2b to be securely clamped.

[0034] Spacers 13 are interposed between the corners of the base material 11 and the four clamping members 12, and come into contact with the outer surfaces of the flange portions 2b of the structure 2. The spacers 13 are formed from rectangular plate material that is slightly thinner than the thickness of the flange portions 2b, and are provided with through holes 13a that match the through holes 11a of the base material 11 and the through holes 12a of the clamping members 12.

[0035] With spacers 13 interposed between each corner of the base material 11 and the four clamping members 12, bolts 15 of fastening members 14 are passed from above through the through holes 12a of the clamping members 12, the through holes 13a of the spacers 13 and the through holes 11a of the base material 11, and two long nuts 16 are screwed onto the protruding portions of the bolts 15, thereby fastening the four corners of the base material 11 to the four clamping members 12.

[0036] In the above description, the spacer 13 is formed from a rectangular plate material, but the spacer may be formed by stacking multiple leaf spring materials instead of a rectangular plate material. By using a spacer made of multiple layered leaf spring materials in this way, the fastening force between the bolt 15 and the long nut 16 can be increased against the elastic force of the leaf springs that make up the spacer, and loosening prevention can be further suppressed. Therefore, the fastening between the base material 11 and the clamping member 12 can be strengthened, and loosening prevention can be suppressed.

[0037] Furthermore, a plurality of microparticles 30 having a high hardness relative to the structure 2 and the base material 11 are arranged on the upper surface of the base material 11 on the fastening portion side of the fastening member 14 between the lower surface of the flange portion 2b of the structure 2 and the upper surface of the base material 11. The microparticles 30 are formed from steel balls having a diameter of approximately 2 to 4 mm and are arranged, for example, at approximately equal intervals on the upper surface of an adhesive tape 31. When the flange portion 2b, the base material 11, and the clamping member 12 are fastened together by the fastening member 14, the microparticles 30 are embedded in the base material 11 and the flange portion 2b, respectively. As a result, the plurality of microparticles 30 are arranged on the lower surface of the flange portion 2b and the upper surface of the base material 11 near positions where the pressing force of the fastening member 14, consisting of the bolt 15 and the long nut 16, acts on the fastening portion side of the fastening member 14, and the axial force of the bolt 15 can be applied to each of the plurality of microparticles 30 (see FIG. 6). Although FIG. 6 shows a case where there are six microparticles 30, the number of microparticles 30 is not limited to this and can be changed as appropriate.

[0038] The adhesive tape 31 is intended to prevent the microparticles 30 formed from steel balls from rolling on the surface of the base material 11. Therefore, as long as the microparticles 30 can be fixed so as not to roll on the surface of the base material 11, it is not necessarily required to use the adhesive tape 31; for example, the microparticles 30 may be placed on the surface of the base material 11 using an adhesive or the like.

[0039] Next, an example of a procedure for attaching the brace 8 using the mounting bracket 10 configured as described above will be described.

[0040] First, the brace mounting portion 20 is fixed to the underside of the base material 11 with fixing screws 21, and the brace connecting fitting 22 is rotatably attached to the support portion 20b of the brace mounting portion 20 with bolts 24 and nuts 25 to form a unit. In addition, microgranules 30 are arranged with adhesive tape 31 on the fastening portion side of the fastening member 14 on the top surface of the base material 11, that is, on the inward side of the base material 11 from the through-hole 11a provided in the corner of the base material 11.

[0041] Next, the base material 11 with the microgranules 30 arranged on its upper surface is brought into contact with the underside of the flange portion 2b of the structure 2. With the base material 11 in contact with the underside of the flange portion 2b of the structure 2, the clamping member 12 is placed on the upper surface of the flange portion 2b above the corner of the base material 11 via the spacer 13. Then, from above, the bolt 15 constituting the fastening member 14 is inserted through the through hole 12a of the clamping member 12, the through hole 13a of the spacer 13, and the through hole 11a of the base material 11, and a long nut 16 is screwed onto the bolt 15 protruding downward, fastening the corner of the base material 11 and the clamping member 12 together.

[0042] After fastening the corners of the base material 11 and the clamping members 12, one end of the rectangular tubular brace 8 is inserted into the rectangular hollow portion of the brace connecting fitting 22, which is rotatably supported on the brace mounting portion 20, and the brace 8 is connected with a fixing screw 23. This allows the brace 8 to be attached parallel to the longitudinal direction of the structure 2. Furthermore, with the unitized brace mounting portion 20 connected to the underside of the flange portion 2b of the structure 2, the brace 8 can be connected to the brace connecting fitting 22. This makes it easy to attach the brace 8 during construction, and also makes it easy to adjust the angle of the brace 8.

[0043] <Modifications of the clamping member> In the above explanation, the clamping member 12 is formed from a plate material that is generally rectangular in plan view, and a spacer 13 is used, but it is also possible to use a clamping member 12A that is integrally formed with an abutment portion 12b that is generally rectangular in plan view and abuts the upper surface of flange portion 2b, and a step portion 12c that abuts the outer surface of flange portion 2b, as shown in Figures 9 to 11. With clamping member 12A configured in this way, it is possible to integrate clamping member 12 and spacer 13 of the first embodiment, thereby reducing the number of components of mounting bracket 10.

[0044] A brace mounting structure using the clamping member 12A will be described below with reference to Figures 9 to 11. Note that, since the other parts except for the clamping member 12A are the same as those in the first embodiment, the same parts are denoted by the same reference numerals and their description will be omitted.

[0045] The clamping member 12A has a through hole 12a formed in a portion above a step 12c that is offset from the center of the abutting portion 12b in the longitudinal direction. The clamping member 12A is rotatable in the axial direction of the bolt 15 that constitutes the fastening member 14, and in the fastened state, the long side of the abutting portion 12b from the pivoting portion of the clamping member 12A can abut against the inner side of the flange portion 2b. Furthermore, the step 12c can abut against the outer surface of the flange portion 2b. In this way, in the fastened state, the long side of the clamping member 12A from the pivoting portion abuts against the inner side of the flange portion 2b, thereby increasing the contact area between the clamping member 12A and the flange portion 2b and enabling the flange portion 2b to be securely clamped. In addition, the base material 11 and the clamping members 12A can be firmly fastened together by abutting the abutment portions 12b of the four clamping members 12A arranged above the corners of the base material 11 with the upper surface of the flange portion 2b and abutting the step portions 12c with the outer surface of the flange portion 2b.

[0046] The procedure for attaching the brace 8 using the mounting bracket 10 having the clamping member 12A can be performed in the same manner as in the first embodiment, except for fastening the corner of the base material 11 to the clamping member 12A. When fastening the corner of the base material 11 to the clamping member 12A, as shown in Figures 10 and 11, the base material 11 is placed in contact with the underside of the flange portion 2b of the structure 2, and the clamping member 12A is placed on the upper surface of the flange portion 2b above the corner of the base material 11. At this time, the bolt 15 is inserted through the through hole 12a of the clamping member 12A and the through hole 11a of the base material 11, and with the step portion 12c positioned above the flange portion 2b, the clamping member 12A is rotated around the axis of the bolt 15 to align the step portion 12c with the outer surface of the flange portion 2b. Then, a long nut 16 is screwed onto the downwardly protruding bolt 15, and the corner of the base material 11 and the clamping member 12A are fastened together with the abutment portion 12b of the clamping member 12A abutting against the upper surface of the flange portion 2b and the step portion 12c abutting against the outer surface of the flange portion 2b.

[0047] After fastening the corners of the base material 11 and the clamping members 12A, one end of the rectangular tubular brace 8 is inserted into the rectangular hollow portion of the brace connecting fitting 22, which is rotatably supported on the brace mounting portion 20, and the brace 8 is connected with a fixing screw 23. This allows the brace 8 to be attached parallel to the longitudinal direction of the structure 2. Furthermore, with the unitized brace mounting portion 20 connected to the underside of the flange portion 2b of the structure 2, the brace 8 can be connected to the brace connecting fitting 22. This makes it easy to attach the brace 8 during construction, and also makes it easy to adjust the angle of the brace 8.

[0048] Second Embodiment 12 to 16, the brace mounting structure according to the second embodiment is a case in which the brace 8 is mounted in a direction perpendicular to the longitudinal direction of the structure 2. In the second embodiment, the structures of the brace mounting portion 20, fastening member 14, spacer 13, brace connecting fitting 22, etc. that make up the mounting fitting 10 are the same as in the first embodiment, so the same parts are given the same reference numerals and their explanations will be omitted.

[0049] In the second embodiment, the base material 11 to which the brace mounting portion 20 is fixed is fixed to the underside of the flange portion 2b of the structure 2 with the support portion 20b of the brace mounting portion 20 oriented perpendicular to the longitudinal direction of the structure 2.

[0050] In the second embodiment, the procedure for attaching a brace 8 using mounting bracket 10 is the same as in the first embodiment, in that the brace mounting portion 20 is first fixed to the underside of the base material 11 with fixing screws 21, and then the brace connecting bracket 22 is rotatably attached to the support portion 20b of the brace mounting portion 20 with bolts 24 and nuts 25 to form a unit. Also, as shown in Figure 18, microgranules 30 are arranged with adhesive tape 31 on the fastening portion side of the fastening member 14 on the top surface of the base material 11, that is, on the inward side of the base material 11 from the through-hole 11a provided in the corner of the base material 11.

[0051] Next, the base material 11 with the microgranules 30 arranged on its upper surface is brought into contact with the underside of the flange portion 2b of the structure 2, with the support portion 20b of the brace mounting portion 20 oriented perpendicular to the longitudinal direction of the structure 2. With the base material 11 in contact with the underside of the flange portion 2b of the structure 2, the clamping member 12 is placed on the upper surface of the flange portion 2b above the corner of the base material 11 via a spacer 13. Then, from above, a bolt 15 constituting a fastening member 14 is inserted through the through hole 12a of the clamping member 12, the through hole 13a of the spacer 13, and the through hole 11a of the base material 11, and a long nut 16 is screwed onto the bolt 15 protruding downward, fastening the corner of the base material 11 and the clamping member 12 together.

[0052] After fastening the corners of the base material 11 and the clamping members 12, one end of the rectangular tubular brace 8 is inserted into the rectangular hollow portion of the brace connecting fitting 22, which is rotatably supported on the brace mounting portion 20, and the brace 8 is connected with a fixing screw 23. In this way, the brace 8 is attached in a direction perpendicular to the longitudinal direction of the structure 2. Furthermore, with the unitized brace mounting portion 20 connected to the underside of the flange portion 2b of the structure 2, the brace 8 can be connected to the brace connecting fitting 22. This makes it easy to attach the brace 8 during construction, and also makes it easy to adjust the angle of the brace 8.

[0053] While the second embodiment has been described with reference to the case where spacer 13 is used, it is also possible to use a clamping member 12A in which abutment portion 12b that is generally rectangular in plan view and abuts the upper surface of flange portion 2b and a step portion 12c that abuts the outer surface of flange portion 2b are integrally formed, as shown in Figures 9 to 11. With clamping member 12A configured in this way, clamping member 12 and spacer 13 can be integrated, thereby reducing the number of components of mounting bracket 10.

[0054] According to the brace mounting structure of the embodiment configured as described above, the base material 11, which is rectangular in plan view and abuts against the underside of the flange portion 2b of the structural body 2, and the four clamping members 12 (12A) arranged above the corners of the base material 11 can be fastened together with the fastening members 14. This allows the orientation of the support portion 20b of the brace mounting portion 20 fixed to the underside of the base material 11 to be mounted in either a direction parallel to or perpendicular to the longitudinal direction of the structural body 2. Therefore, the brace 8 can be mounted in either a direction parallel to or perpendicular to the longitudinal direction of the structural body 2 using the same procedure, providing high earthquake resistance and ease of installation for the suspended ceiling.

[0055] Furthermore, according to the brace mounting structure of the embodiment, brace connecting fittings 22 are supported vertically rotatably on a pair of support portions 20b that constitute brace mounting portion 20 fixed to the underside of base material 11, forming a unit, and braces 8 can be connected to brace connecting fittings 22 with unitized brace mounting portion 20 fixed to the underside of flange portion 2b of structural body 2. This makes it easy to mount braces 8 during construction, and also makes it easy to adjust the angle, and because braces 8 are rotatably mounted to structural body 2, they can absorb shaking caused by earthquakes, vibrations, etc. [Explanation of symbols]

[0056] 1 skeleton 2 structure 2b Flange part (lower flange part) 8 braces 10 Mounting bracket 11 Base material 12,12A Clamping member 12b Contact part 12c stepped section 13 Spacer 14 Fastening members 15 volts 16 Long nut 20 Brace mounting part 20a Fixed part 20b Support part 21 Fixing screw 22 Brace connector 30 Microscopic particles

Claims

1. A brace mounting structure in which a brace is mounted to an H-shaped cross-section structure via a mounting bracket, The mounting bracket comprises a base material having a rectangular shape in plan view, the upper surface of which abuts against the lower surface of the flange portion of the structure; four clamping members arranged above corners of the base material and cooperating with the base material to clamp the flange portion of the structure; a fastening member for fastening the corner portion of the base material and the clamping member; and a brace mounting portion fixed to the underside of the base material. A brace mounting structure characterized by:

2. The brace mounting structure according to claim 1, The brace mounting portion has a fixing portion attached to the lower surface of the base material and a pair of support portions extending downward from the fixing portion at a distance, The brace is supported by the support portion so as to be rotatable in the vertical direction. A brace mounting structure characterized by:

3. The brace mounting structure according to claim 2, a brace connection fitting is supported by the support portion of the brace mounting portion so as to be rotatable in the vertical direction, and the brace is connected to the brace connection fitting with the brace mounting portion fixed to the underside of the flange portion of the structure.

4. The brace mounting structure according to claim 1, A brace mounting structure characterized in that spacers that abut against the outer surfaces of the flange portions of the structure are interposed between the corners of the base material and the four clamping members, and the fastening members fasten the base material and the clamping members with the spacers interposed.

5. The brace mounting structure according to claim 1, A brace mounting structure characterized in that the clamping member is integrally formed with an abutment portion that abuts against the upper surface of the flange portion of the structure and a step portion that abuts against the outer surface of the flange portion.

6. The brace mounting structure according to any one of claims 1, 4 and 5, The clamping member is formed of a plate material that is generally rectangular in plan view, the fastening member is composed of a bolt that penetrates perpendicularly through the clamping member and the base material, and a nut that is screwed onto the bolt, a portion of the clamping member that is offset from the center in the longitudinal direction can rotate in the axial direction of the bolt, and in a fastened state, the longer side of the clamping member from the rotating portion abuts against the inner side of the flange portion.

7. The brace mounting structure according to claim 1, a plurality of microgranules having a high hardness relative to the structure and the base material are disposed on a fastening portion side of the fastening member between a lower surface of a flange portion of the structure and an upper surface of the base material; A brace mounting structure characterized in that the micro-particles are embedded in the base material and the flange portion when the flange portion, the base material, and the clamping member are fastened together by the fastening members.

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