Brace connecting metal fitting, and Anti-sway structure

Abstract

To prevent deformation of a pair of hanging bolts for supporting a ceiling hanging object and to maintain the hanging attitude of the ceiling hanging object even when a large force acts thereon when an earthquake occurs.SOLUTION: A brace connecting metal fitting 4 for connecting a brace bolt 5 serving as an oblique reinforcing material to a hanging bolt 3 has a fixing metal fitting 10 fixed in a state of sandwiching the hanging bolt 3 and provided with a pair of mounting parts 15, 25 on both sides sandwiching the hanging bolt 3, fastening members 50, 50 mounted on the pair of mounting parts 15, 25, and a pair of connecting members 30, 30 held outside the pair of mounting parts 15, 25 by the fastening members 50, 50. In the brace connecting metal fitting 4, the fastening members 50, 50 are fastened in a state where the brace bolts 5, 5 are disposed between the mounting parts 15, 25 and the connecting members 30, 30 on both sides of the fixing metal fitting 10, so that the pair of brace bolts 5, 5 are disposed in the same direction with the hanging bolt 3 interposed therebetween and connected to the hanging bolt 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a brace connecting fitting and a vibration prevention structure using the same. [Background technology]

[0002] Various ceiling-suspended objects are installed in the ceiling space of a building. For example, air conditioning ducts are also installed in a suspended state in the ceiling space. Conventionally, as a structure for supporting long ceiling-suspended objects such as ducts in a suspended state in the ceiling space, a method has been proposed in which shelf-shaped or frame-shaped support members are installed in the ceiling space at predetermined intervals and the ceiling-suspended objects are fixed to the support members (for example, Patent Document 1). In this case, a suspension bolt may be used as a suspension member for suspending the support member in the ceiling space (for example, FIG. 4 of Patent Document 1).

[0003] However, since the suspension bolts have low rigidity, they vibrate greatly during an earthquake. Therefore, the support members that support objects suspended from the ceiling also vibrate greatly. If the support members support an air conditioning duct, there is a problem that the duct may be damaged due to the vibration of the support members. To prevent this, a method is adopted in which two brace bolts are connected to a pair of suspension bolts that support the support member to reinforce them. For example, the hardware disclosed in Patent Document 2 can be used as the hardware that connects the brace bolts to the suspension bolts.

[0004] FIG. 8 is a front view showing a conventional support structure in which the hanging bolts are reinforced. FIG. 9 is a side view showing a conventional support structure in which the hanging bolts are reinforced. As shown in FIG. 8, a support member 102 is connected to the lower end of a pair of hanging bolts 101 hanging from a ceiling structure 100 such as an upper floor floor slab, and an air conditioning duct 103 is supported by the support member 102. Metal fittings 104 for connecting brace bolts 105 are attached to positions near the upper and lower ends of the pair of hanging bolts 101. Two brace bolts 105, 105 are arranged so as to cross between the pair of hanging bolts 101, 101, and both ends are fixed to the metal fittings 104. By connecting the two brace bolts 105, 105 between the pair of hanging bolts 101, 101 in a crossed state, the hanging bolts 101, 101 can be prevented from swinging. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7182827 [Patent Document 2] Patent No. 5657093 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the above-mentioned conventional anti-vibration structure, as shown in FIG. 9(a), the brace bolt 105 is disposed only on one side of the hanging bolt 101 with respect to the longitudinal direction (X direction) of the duct 103. Therefore, when a large force F1 in the Y direction acts on the support member 102 in the event of an earthquake, as shown in FIG. 8, stress acts on the hanging bolt 101 in a direction not reinforced by the brace bolt 105 (F2 direction shown in FIG. 9(a)). This stress causes the hanging bolt 101 to twist, causing the hanging bolt 101 to deform out of plane as shown in FIG. 9(b). In other words, when an earthquake occurs, the hanging bolt 101 may bend in a direction in which the brace bolts 105, 105 are not connected. If the hanging bolt 101 is twisted and deformed, as shown in FIG. 9(b), the support member 102 will not be able to hold the duct 103 in the correct position, which still causes the duct 103 to be damaged.

[0007] The present invention has been made to solve the above problems, and aims to provide a brace connecting fitting that prevents deformation of the hanging bolts and maintains the position of an object hung from the ceiling even when a large force is applied during an earthquake, and a vibration prevention structure using the same. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, firstly, the present invention provides a brace connecting bracket that is attached to a hanging bolt and connects a brace bolt that serves as a diagonal reinforcement for the hanging bolt, the brace connecting bracket comprising: a fixing bracket that is fixed in a state in which the hanging bolt is sandwiched and has a pair of mounting portions on both sides of the hanging bolt, a fastening member that is attached to the pair of mounting portions, and a pair of connecting members that are held on the outside of the pair of mounting portions by the fastening members, the fastening members being tightened with the brace bolt positioned between the mounting portions and the connecting members on both sides of the fixing bracket, thereby arranging the pair of brace bolts in the same direction across the hanging bolt and connecting them to the hanging bolt.

[0009] Secondly, the present invention provides a brace connecting fitting having the first configuration, further comprising a biasing member provided between the mounting portion and the connecting member, the biasing member biasing in a direction widening the gap between the mounting portion and the connecting member.

[0010] Thirdly, the present invention is characterized in that, in a brace connecting fitting having the first or second configuration, the fixing fitting has a clamping portion that clamps the hanging bolt, and the clamping portion has an engaging portion that engages with a male screw formed on the outer peripheral surface of the hanging bolt.

[0011] Fourth, the present invention provides a vibration prevention structure for preventing the vibration of a ceiling-suspended object supported by a pair of hanging bolts hanging into a ceiling space, comprising a plurality of brace connecting fittings attached to the pair of hanging bolts, and a plurality of brace bolts arranged diagonally between the pair of hanging bolts and both ends fixed to the brace connecting fittings, characterized in that the plurality of brace connecting fittings hold two pairs of brace bolts in a mutually crossed state between the pair of hanging bolts.

[0012] Fifth, the present invention provides a vibration prevention structure having the fourth configuration, characterized in that each of the multiple brace connecting fittings connects and fixes the ends of the pair of brace bolts to the hanging bolt with the pair of brace bolts arranged in the same diagonal direction across the hanging bolt.

[0013] Sixth, the present invention is characterized in that, in the anti-vibration structure having the fourth or fifth configuration, it further includes a cross-connecting fitting that is provided at the intersection where the two sets of pairs of brace bolts cross each other and connects the two sets of pairs of brace bolts. Effect of the Invention

[0014] According to the present invention, a pair of brace bolts are connected with the hanging bolt sandwiched between them, so that even if a large force is applied during an earthquake, deformation of the hanging bolt can be prevented and the normal posture of the object hung from the ceiling can be maintained. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view showing a configuration example of an anti-vibration structure. [Diagram 2] FIG. 2 is an exploded perspective view showing an example of a configuration of a brace connecting fitting. [Diagram 3] 13A and 13B are diagrams showing the process of attaching the brace connecting fitting to the hanging bolt. [Figure 4] 13A and 13B are diagrams showing the process of attaching the brace connecting fitting to the hanging bolt. [Diagram 5] 13A and 13B are diagrams showing the process of attaching the brace connecting fitting to the hanging bolt. [Figure 6] FIG. 11 is a side view showing a state in which a pair of brace bolts are connected and fixed to a suspension bolt by a brace connecting fitting. [Figure 7] FIG. 13 is a perspective view showing a modified example of the anti-vibration structure. [Figure 8] FIG. 1 is a front view showing a conventional support structure in which a hanging bolt is reinforced. [Figure 9] FIG. 1 is a side view showing a conventional support structure in which a hanging bolt is reinforced. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings referred to below, the same reference numerals are used to designate common members, and redundant description thereof will be omitted.

[0017] FIG. 1 is a perspective view showing a configuration example of a vibration prevention structure 1 according to an embodiment of the present invention. The XYZ three-dimensional coordinate system shown in FIG. 1 is a coordinate system in which the XY plane is the horizontal plane and the Z direction is the vertical direction, and is a coordinate system common to the coordinate systems shown in other figures. The vibration prevention structure 1 is a structure for preventing the vibration of a ceiling-suspended object 2 supported in a ceiling space by a suspension bolt 3. The suspension bolt 3 supporting the ceiling-suspended object 2 is composed of a pair of suspension bolts 3a and 3b arranged at a predetermined interval. In other words, the ceiling-suspended object 2 is connected to the lower ends of the pair of suspension bolts 3a and 3b, and is supported in a suspended state in the ceiling space.

[0018] The ceiling suspended object 2 has a support member 7 in which multiple frame steel members 7a, 7b, 7c, and 7d are assembled in a rectangular shape, and the support member 7 holds an air conditioning duct 8, which is an object to be supported. The support member 7 is formed in a frame shape using the frame steel members 7a and 7d as horizontal members (horizontal members) and the frame steel members 7b and 7c as vertical members (vertical members). The frame steel members 7a and 7d of the support member 7 are supported horizontally in the YZ plane by the hanging bolts 3a and 3b. The duct 8 is, for example, a rectangular tubular duct, and is supported by the support member 7 while being housed inside the frame-shaped support member 7. For example, the duct 8 is fixed to the lower frame steel member 7d of the horizontal frame steel members 7a and 7d. The duct 8 is long in the X direction. In order to support the long duct 8 in the ceiling space, for example, the vibration prevention structure 1 shown in FIG. 1 is installed in the ceiling space at a predetermined interval along the longitudinal direction of the duct 8. Each of the plurality of anti-vibration structures 1 installed in the ceiling space supports a predetermined position in the longitudinal direction of the duct 8 at a predetermined height in the ceiling space. The support member 7 is not limited to a frame shape, and may be formed in a shelf shape. In addition, although the present embodiment illustrates an example in which the duct 8 is a rectangular tubular duct, the shape of the duct 8 is not necessarily limited to a rectangular tubular shape.

[0019] A pair of suspension bolts 3a, 3b supporting the ceiling-suspended object 2 hangs down from a structural body such as an upper floor slab into the ceiling space of the lower floor. The pair of suspension bolts 3a, 3b support the ceiling-suspended object 2 including the support member 7 at a predetermined height in the ceiling space. For example, the pair of suspension bolts 3a, 3b are fixed at their lower ends to a frame steel material 7a above the support member 7, and support the support member 7 in a position contained within the YZ plane.

[0020] A plurality of brace connecting fittings 4 are attached to the pair of hanging bolts 3a, 3b. Specifically, the brace connecting fittings 4, 4 are attached to two locations, the upper and lower parts of the hanging bolt 3a. In addition, the brace connecting fittings 4, 4 are attached to two locations, the upper and lower parts of the hanging bolt 3b. The brace connecting fittings 4 are fittings for connecting a brace bolt 5, which serves as a diagonal reinforcement material, between the pair of hanging bolts 3a, 3b. In particular, the brace connecting fittings 4 of this embodiment are capable of connecting a pair of brace bolts 5, 5 to both sides of the hanging bolt 3 with the hanging bolt 3 in between, and the pair of brace bolts 5, 5 are arranged in the same direction and connected to the hanging bolt 3.

[0021] 1, one end of a pair of brace bolts 5a, 5b is connected to a brace connecting metal fitting 4 attached to a position near the lower end of the hanging bolt 3a, and the other end is connected to a brace connecting metal fitting 4 attached to a position near the upper end of the hanging bolt 3b. Another pair of brace bolts 5c, 5d is connected to a brace connecting metal fitting 4 attached to a position near the upper end of the hanging bolt 3a, and the other end is connected to a brace connecting metal fitting 4 attached to a position near the lower end of the hanging bolt 3b. In this way, the anti-sway structure 1 of this embodiment holds two pairs of brace bolts 5, 5 in a mutually crossed state between the pair of hanging bolts 3a, 3b.

[0022] 2 is an exploded perspective view showing an example configuration of the brace connection fitting 4. The brace connection fitting 4 includes a fixing fitting 10, fastening members 40, 50, connecting members 30, and biasing members 35.

[0023] The fixing bracket 10 includes a first fitting 11 and a second fitting 21. The fixing bracket 10 is clamped and fixed by the first fitting 11 and the second fitting 21 at a predetermined height position of the hanging bolt 3.

[0024] The first metal fitting 11 is a metal fitting formed, for example, by bending a metal plate of a predetermined shape, and is joined to the second metal fitting 21 to clamp and fix the hanging bolt 3. The first metal fitting 11 has a fixing portion 13, a clamping portion 14, an attachment portion 15, and a reinforcing portion 16. The fixing portion 13 is formed, for example, in a flat plate shape, and is formed with a hole 13a through which the shank portion (male screw portion) of the bolt 41, which is the fastening member 40, is inserted. The clamping portion 14 is formed by a bent portion between the fixing portion 13 and the attachment portion 15, and is joined to the outer circumferential surface of the hanging bolt 3 to clamp the hanging bolt 3. The clamping portion 14 is formed with protruding engagement portions 14a, 14b that engage with the male screw formed on the outer circumferential surface of the hanging bolt 3. The attachment portion 15 has a flat plate shape for attaching the brace bolt 5, and is formed with holes 15a, 15b through which the shank portion (male screw portion) of the bolt 51, which is the fastening member 50, is inserted. The two holes 15a, 15b formed in the mounting portion 15 have an inclination angle of, for example, 45 degrees with respect to the vertical direction. The reinforcing portions 16 are formed by bending the ends of the mounting portion 15 in three directions, and prevent the flat mounting portion 15 from being deformed.

[0025] The second metal fitting 21 is a metal fitting formed, for example, by bending a metal plate of a predetermined shape, and is joined to the first metal fitting 11 to clamp and fix the hanging bolt 3. It has a fixing portion 23, an attachment portion 25, and a reinforcing portion 26. The fixing portion 23 is formed, for example, by a flat plate portion extending from the attachment portion 25, and has a hole 23a through which the shaft portion (male screw portion) of the bolt 41, which is the fastening member 40, is inserted. The fixing portion 23 is joined to the fixing portion 13 of the first metal fitting 11, and is also joined to the outer circumferential surface of the hanging bolt 3 attached to the clamping portion 14. The fixing portion 23 is also joined to the outer circumferential surface of the hanging bolt 3 attached to the clamping portion 14 of the first metal fitting 11, and clamps the hanging bolt 3 together with the first metal fitting 11. The mounting portion 25 has a flat plate-like form for mounting the brace bolt 5, and is formed with holes 25a, 25b for inserting the shaft portion (male thread portion) of the bolt 51, which is the fastening member 50. The two holes 25a, 25b formed in the mounting portion 25 have an inclination angle of, for example, 45 degrees with respect to the vertical direction, similar to the holes 15a, 15b of the first fitting 11. The distance between the two holes 25a, 25b is the same as the distance between the two holes 15a, 15b of the first fitting 11. The reinforcing portion 26 is formed by bending the upper and lower end portions of the mounting portion 25, and prevents the flat mounting portion 25 from deforming.

[0026] The first fitting 11 and the second fitting 21 are assembled with the fixing portions 13, 23 joined to each other. The first fitting 11 and the second fitting 21 are fixed to each other with the hanging bolt 3 sandwiched between the clamping portion 14 by inserting the shaft portion of the bolt 41 into the holes 13a, 23a of the fixing portions 13, 23 and tightening the nut 42 attached to the tip of the shaft portion.

[0027] The fixing bracket 10 as described above has a pair of mounting portions 15, 25 on both sides of the first bracket 11 and the second bracket 21 that sandwich the hanging bolt 3. Fastening members 50, 50 are attached to the pair of mounting portions 15, 25. For example, the fastening member 50 is composed of a bolt 51 and a nut 52, and the nut 52 is attached to the tip of the shaft of the bolt 51 that is inserted through the holes 15a, 15b of the mounting portion 15 and the holes 25a, 25b of the mounting portion 25, and is attached in a state where it penetrates the pair of mounting portions 15, 25.

[0028] A pair of connecting members 30, 30 are attached to the outside of the pair of mounting parts 15, 25 of the fixing bracket 10. The pair of connecting members 30, 30 are held outside the pair of mounting parts 15, 25 by fastening members 50, 50. The connecting members 30, 30 are metal fittings that connect and fix the ends of the brace bolts 5, 5 to the outside of the pair of mounting parts 15, 25. The connecting member 30 is formed, for example, by a flat metal fitting. The connecting member 30 has two holes 31a, 31b formed at the same interval as the holes 15a, 15b and 25a, 25b formed in the mounting parts 15, 25. The shafts of the bolts 51 of the fastening members 50, 50 are inserted into these two holes 31a, 31b, and the connecting member 30 is held outside the mounting parts 15, 25. An engagement portion 32 that engages with the outer circumferential surface of the brace bolt 5 is formed to protrude from the surface of the connecting member 30 that faces the mounting portions 15, 25.

[0029] A pair of biasing members 35, 35 are attached to the inside of the pair of connecting members 30, 30. The biasing members 35, 35 are formed of coil springs or the like as shown in FIG. 2. The shaft portion of the bolt 51 of the fastening member 50 is inserted into the inside of the biasing members 35, 35 and is held outside the mounting portion 15, 25. The biasing members 35, 35 bias in a direction to widen the gap between the mounting portion 15, 25 and the connecting members 30, 30. Therefore, when the fastening member 50 is not tightened, the connecting members 30, 30 are held at a position away from the mounting portion 15, 25 by the biasing force of the biasing members 35, 35. This allows a space to be formed between the connecting members 30, 30 and the mounting portion 15, 25 into which the brace bolts 5, 5 can be inserted.

[0030] The brace connecting fitting 4 configured as described above is attached to the hanging bolt 3 with the biasing members 35, 35 and the connecting members 30, 30 arranged on the outside of the pair of mounting portions 15, 25 and the two fastening members 50, 50 attached to the pair of mounting portions 15, 25.

[0031] 3 to 5 are diagrams showing the process of attaching the brace connecting fitting 4 to the hanging bolt 3. First, as shown in FIG. 3(a), the brace connecting fitting 4 widens the gap d between the pair of fixing parts 13, 23 without the fastening member 40 attached, and the hanging bolt 3 is housed inside the clamping part 14. Next, as shown in FIG. 3(b), the fastening member 40 is attached to the pair of fixing parts 13, 23, and the nut 42 is tightened. As a result, as shown in FIG. 4(a), the pair of fixing parts 13, 23 are joined to each other, and the hanging bolt 3 is fixed in a state where it is sandwiched between the clamping part 14 and the fixing part 23 of the fixing fitting 10. At this time, the engagement parts 14a, 14b provided on the clamping part 14 engage with the male thread formed on the outer circumferential surface of the hanging bolt 3. Therefore, the fixing fitting 10 is fixed at a predetermined height position of the hanging bolt 3 without being displaced in the longitudinal direction (vertical direction) of the hanging bolt 3. Furthermore, when the fixing bracket 10 is fixed to the hanging bolt 3, the clamping portion 14 and the fixing portion 23 are fixed in a state in which they surround the outer circumferential surface of the hanging bolt 3. Therefore, the fixing bracket 10 is attached to the hanging bolt 3 in a state in which it does not rotate around the shaft portion of the bolt 41. As a result, the brace connecting bracket 4 is fixed to the hanging bolt 3 in a stable posture.

[0032] When the brace connecting fitting 4 is fixed to the hanging bolt 3, a space into which the brace bolts 5, 5 can be inserted is formed between the pair of mounting parts 15, 25 and the connecting members 30, 30, as shown in Fig. 4(a). The connecting members 30, 30 are attached at an angle of 45 degrees to the hanging bolt 3. Therefore, as shown in Fig. 4(b), a worker can easily insert the end of the brace bolt 5, 5, which is disposed in an oblique direction, into the gap formed between the pair of mounting parts 15, 25 and the connecting members 30, 30.

[0033] When the ends of the pair of brace bolts 5,5 are inserted between the pair of mounting parts 15,25 and the connecting members 30,30, the worker tightens the fastening members 50,50. For example, the worker tightens the nuts 52,52 of the fastening members 50,50 to fix the ends of the brace bolts 5,5 to the pair of mounting parts 15,25, respectively. By tightening the fastening members 50,50, the connecting members 30,30 are deformed as shown in FIG. 5. That is, the fastening force of the fastening members 50,50 causes the connecting members 30,30 to bend and deform so as to follow the outer circumferential surface of the brace bolts 5,5. At this time, the engaging portions 32 formed on the inner side of the connecting members 30,30 engage with the outer circumferential surface of the brace bolts 5,5. As a result, the brace bolts 5,5 are fixed in a state in which they do not come off the brace connecting fittings 4.

[0034] As shown in FIG. 1, the brace connecting fittings 4 as described above are attached to the upper and lower parts of a pair of suspension bolts 3a, 3b, and two pairs of brace bolts 5, 5 are attached between the pair of suspension bolts 3a, 3b.

[0035] FIG. 6 is a side view showing a state in which a pair of brace bolts 5, 5 are connected and fixed to the hanging bolt 3 by the brace connecting fitting 4, sandwiching the hanging bolt 3. The brace connecting fitting 4 fixed to the upper part of the hanging bolt 3 connects the brace bolts 5, 5 on both sides of the hanging bolt 3, as shown in the enlarged view A of FIG. 6. The brace connecting fitting 4 fixed to the lower part of the hanging bolt 3 also connects the brace bolts 5, 5 on both sides of the hanging bolt 3, as shown in the enlarged view B of FIG. 6. The pair of brace bolts 5, 5 connected to one brace connecting fitting 4 have the same length and are arranged in the same direction. Therefore, the hanging bolt 3 is evenly reinforced by the pair of brace bolts 5, 5 in the X direction. As a result, even if a large force in the Y direction acts on the support member 7 during an earthquake, the anti-vibration structure 1 of this embodiment does not cause twisting of the hanging bolt 3. Therefore, in the anti-vibration structure 1 of the present embodiment, even in the event of a large-scale earthquake, the attitude of the support member 7 is not changed, and therefore the duct 8 is not damaged.

[0036] In addition, the anti-sway structure 1 shown in FIG. 1 is provided with a cross-connecting metal fitting 6 at the intersection where two pairs of brace bolts 5, 5 cross each other. The cross-connecting metal fitting 6 is a metal fitting that connects two pairs of brace bolts 5, 5 to each other. For example, the cross-connecting metal fitting 6 shown in FIG. 1 is composed of four disk-shaped metal fittings, and connects and fixes the intersection where a total of four brace bolts 5 cross each other. By attaching such a cross-connecting metal fitting 6, the anti-sway structure 1 can prevent the brace bolts 5, 5 from bending at the center even if a large-scale earthquake occurs. In other words, the anti-sway structure 1 equipped with the cross-connecting metal fitting 6 has a significantly improved earthquake resistance performance compared to a configuration without the cross-connecting metal fitting 6. Therefore, the anti-sway structure 1 has the advantage that the ceiling-suspended object 2 can be held in a more stable position when an earthquake occurs.

[0037] An embodiment of the present invention has been described above. However, the present invention is not limited to the embodiment described above. In other words, the present invention can be applied to various modified examples other than the configuration described in the embodiment above.

[0038] FIG. 7 is a perspective view showing a modified example of the anti-sway structure 1. In the anti-sway structure 1 shown in FIG. 7, reinforcing parts for reinforcing the hanging bolts 3, 3 by crossing two pairs of brace bolts 5, 5 with each other are arranged in two stages, above and below the hanging bolts 3, 3. When the inclination angle of the brace bolts 5, 5 arranged between the pair of hanging bolts 3, 3 increases, the reinforcing strength decreases. Therefore, the anti-sway structure 1 shown in FIG. 7 prevents the inclination angle of the brace bolts 5, 5 from increasing by forming the reinforcing parts in two stages, above and below, and exerts sufficient reinforcing strength. In addition, a connecting bolt that crosses the pair of hanging bolts 3, 3 in the horizontal direction may be connected between the reinforcing parts in the upper stage and the reinforcing parts in the lower stage. By connecting the connecting bolts in the horizontal direction, the strength can be further increased. In addition, Figure 7 shows an example in which the reinforcing portion in which the brace bolts 5, 5 are crossed is arranged in two tiers, one above the other, but in cases in which the suspension bolts 3, 3 are longer, the reinforcing portion may be arranged in three or more tiers.

[0039] For example, in the above embodiment, a configuration in which the support member 7 supports the duct 8 has been exemplified as an example of the ceiling suspended object 2. However, the ceiling suspended object 2 to which the present invention is applicable is not limited to one that supports the duct 8. For example, the ceiling suspended object 2 may support a pipe other than the duct 8, or may support a cable or the like. [Explanation of symbols]

[0040] 1...anti-vibration structure, 2...object suspended from the ceiling, 3 (3a, 3b)...suspension bolt, 4...brace connecting fitting, 5 (5a, 5b, 5c, 5d)...brace bolt, 6...cross connecting fitting, 7...support member, 8...duct (object to be supported), 10...fixing fitting, 14...clamping portion, 14a, 14b...engaging portion, 15, 25...mounting portion, 40, 50...fastening member, 30...connecting member, 32...engaging portion, 35...biasing member.

Claims

1. A brace connecting fitting that is attached to a hanging bolt and connects a brace bolt that serves as a diagonal reinforcement to the hanging bolt, a fixing bracket that is fixed in a state in which the hanging bolt is sandwiched and has a pair of mounting portions provided on both sides of the hanging bolt; A fastening member attached to the pair of mounting portions; a pair of connecting members held on the outer sides of the pair of mounting portions by the fastening members; Equipped with A brace connecting fitting characterized in that the fastening members are tightened with brace bolts positioned between the mounting portions and the connecting members on both sides of the fixing fitting, thereby arranging a pair of brace bolts in the same direction across the hanging bolt and connecting them to the hanging bolt.

2. a biasing member provided between the attachment portion and the connecting member; Further comprising: The brace connecting fixture according to claim 1 , wherein the biasing member biases the mounting portion and the connecting member in a direction to increase the distance between the mounting portion and the connecting member.

3. The fixing bracket has a clamping portion that clamps the hanging bolt, 3. The brace connecting fixture according to claim 1, wherein the clamping portion has an engagement portion that engages with a male screw formed on an outer circumferential surface of the suspension bolt.

4. A vibration prevention structure for preventing the vibration of a ceiling-suspended object supported by a pair of suspension bolts hanging down in a ceiling space, A plurality of brace connectors attached to the pair of hanging bolts; A plurality of brace bolts are disposed diagonally between the pair of hanging bolts, and both ends of the brace bolts are fixed to the brace connecting fittings; Equipped with A vibration prevention structure characterized in that the multiple brace connecting fittings hold two pairs of brace bolts in a crossed state between the pairs of hanging bolts.

5. The anti-vibration structure according to claim 4, characterized in that each of the plurality of brace connecting fittings connects and fixes ends of the pair of brace bolts to the hanging bolt with the pair of brace bolts arranged in the same diagonal direction on either side of the hanging bolt.

6. a cross-connecting fitting provided at an intersection where the two pairs of brace bolts cross each other and connecting the two pairs of brace bolts; The anti-vibration structure according to claim 4 or 5, further comprising:

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