JP2014047538A - Vibration suppressing suspension structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress cumulative plastic deformation of a suspension bolt after enhancing a degree of freedom of installation by eliminating a brace between suspension bolts in a vibration energy absorption suspension structure for reducing vibration of suspension equipment suspended by the suspension bolts from a ceiling slab.SOLUTION: A connector 15 having the combination of upper and lower brackets 16, 17 is provided in a base end part on a ceiling slab 2 side of a suspension bolt, a swing support part 18 allowing the upper and lower brackets 16, 17 of the connector 15 to swing and receiving a load of suspension equipment is provided between the upper and lower brackets 16, 17; and an energy absorber 19 sandwiched between the upper and lower brackets 16, 17 is provided around the swing support part 18.

Description

  The present invention relates to a vibration-suppressing suspension structure that reduces the vibration of suspension equipment suspended from a ceiling slab with suspension bolts.

  Conventionally, a suspension equipment device suspended from a ceiling slab with a suspension bolt may fall due to a large earthquake or the like. When the cause is examined, stress concentrates at the base of the suspension bolt (base end, upper end fixed to the ceiling slab), and plastic deformation accumulates after the base yields, and the suspension bolt root may break. all right. In order to prevent such breakage of the suspension bolt, a brace is provided between one base of the pair of suspension bolts and the other end portion (lower end portion fixed to the suspension equipment), and deformation of each suspension bolt (For example, refer to Patent Document 1).

JP 2008-208687 A

  As described above, if the brace and other steady rest materials are provided, the deformation of the suspension bolt can be drastically suppressed. For example, when placing the suspension equipment across the beam, it is difficult to provide the brace There is.

  The present invention has been made in view of the above-described problems, and in a vibration-suppressing suspension structure that reduces vibrations of suspension equipment suspended from a ceiling slab with suspension bolts, the bracing between the suspension bolts is eliminated and the installation is free. It is an object to suppress deformation of the suspension bolt after increasing the degree.

  As a means for solving the above problem, the invention described in claim 1 is a vibration suppressing suspension structure for reducing vibration of a suspension facility device suspended from a ceiling slab with a suspension bolt, wherein An end is provided with a connector for suspending a bolt body fixed to the suspension equipment, and the connector is fixed to the ceiling slab and forms an upward locking surface; and the bolt body A lower bracket that is fixed and forms a downward locking surface that engages with the upward locking surface from above, and protrudes from one of the upward locking surface and the downward locking surface so that the other pivotably contacts And a swing support portion that receives the load of the suspension equipment, and an energy absorber that is disposed around the swing support portion and is sandwiched between the upward locking surface and the downward locking surface. And features.

According to this configuration, when the suspension equipment vibrates due to an earthquake or the like, the movement of the lower bracket with respect to the upper bracket is converted into a swing around the fulcrum of the swing support portion at the base end of the suspension bolt. By bending the energy absorber around the swing support portion, a part of the vibration energy of the suspension equipment can be absorbed. That is, it is possible to reduce the bending moment acting on the base end portion of the suspension bolt to reduce the deformation of the base end portion of the suspension bolt, and to absorb the vibration energy of the suspension equipment and reduce the vibration. The energy absorber may be an elastic body such as synthetic rubber, a viscoelastic body, or a damping material such as a friction damper.
Moreover, compared with the case where a brace is provided between a plurality of suspension bolts, the degree of freedom of installation is high even when the suspension equipment is disposed across the beam, and vibration measures can be easily implemented.

In the present invention, if the bolt kinetic energy absorber is interposed between the bolt main body and the bolt main body in the lower bracket, the bolt main body moves with respect to the lower bracket. The vibration energy of the suspended equipment can be absorbed also by the bolt dynamic energy absorber while allowing the dynamic energy absorber to be bent.
In the present invention, if the rocking support portion is configured to be a rolling element that is movably held on one of the upward locking surface and the downward locking surface, the rocking motion is centered on the rocking support portion. Becomes smoother and a part of vibration energy can be absorbed well.

  According to the present invention, in a vibration-suppressing suspension structure that reduces vibrations of suspension equipment suspended from a ceiling slab with suspension bolts, deformation of the suspension bolts is achieved while eliminating the bracing between the suspension bolts and increasing the degree of freedom of installation. Can be suppressed.

It is a front view of the vibration suppression suspension structure in the embodiment of the present invention. It is II-II sectional drawing of FIG. (A) is a perspective view of the upper bracket of the coupling member of the suspension bolt of the vibration suppression suspension structure, and (b) is a perspective view of the lower bracket of the coupling tool. It is a front view containing the partial cross section of the said coupling tool. It is VV sectional drawing of FIG. It is a front view equivalent to FIG. 4 which shows the effect | action with respect to the horizontal motion of the said connector. It is a front view equivalent to FIG. 4 which shows the effect | action with respect to the motion of the said connector in the perpendicular direction. It is a front view containing the partial cross section in the modification of the said coupling tool. It is IX-IX sectional drawing of FIG. It is a disassembled perspective view of the coupling tool of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the vibration suppression suspension structure 1 of the present embodiment has a configuration in which suspension equipment 7 such as an air conditioning equipment is suspended from a plurality of (four) suspension bolts 5 on a ceiling slab 2 of a building. Have The hanging equipment 7 has a rectangular parallelepiped shape, for example, and is arranged with its upper surface 8 substantially horizontal. A substantially horizontal flange 9 is provided on the outer periphery of the upper surface 8, for example, over the entire periphery. The lower end portions (tip portions) of the suspension bolts 5 extending in the vertical direction are fastened and fixed to the flanges 9 at the four corners of the suspension equipment device 7 in plan view (top view). Reference numerals 11 and 12 in the drawing denote upper and lower nuts that are screwed to the lower end portion of the suspension bolt 5 and tightened with the flange 9 interposed therebetween. The suspended equipment 7 is arranged to be spaced downward from the lower surface 3 of the ceiling slab 2, and even if there is a beam 4 projecting downward from the lower surface 3 of the ceiling slab 2, it can be arranged below that.

  In the vibration suppression suspension structure 1, a total of four suspension bolts 5 positioned at the four corners of the suspension equipment 7 in a rectangular shape in plan view are provided on the base end (upper end) of each ceiling slab 2 on the upper and lower brackets 16, 17 includes a connector 15 in which 17 are combined. Each suspension bolt 5 includes an anchor bolt 13 fixed to the ceiling slab 2, a connector 15 attached to the anchor bolt 13, and a bolt body 14 suspended from the connector 15.

  As shown in FIGS. 3 and 4, the connector 15 includes an upper bracket 16 fixed to the anchor bolt 13, a lower bracket 17 fixed to the upper end portion of the bolt body 14, and an upward locking formed by the upper bracket 16. A hemispherical swing support portion 18 projecting at the center of the surface 16a and swingably supporting an upper step downward lock surface 17a formed by the lower bracket 17, and an upward lock around the swing support portion 18. The energy absorber 19 is sandwiched between the surface 16a and the lower lower locking surface 17b formed on both sides of the upper lower locking surface 17a.

  The connector 15 locks the lower bracket 17 to the upper bracket 16 via the swing support portion 18 to make the upper and lower brackets 16 and 17 swingable relative to each other, and the energy sandwiched around the swing support portion 18. By bending the absorber 19, the relative swinging energy of the upper and lower brackets 16 and 17 can be absorbed.

  The upper bracket 16 is formed by integrally joining a plurality of steel materials by welding or fasteners. The upper bracket 16 is disposed substantially horizontally and allows the anchor bolt 13 to pass therethrough, and is fixed to the anchor bolt 13 by a nut 13a, and downward from both side ends of the first plate portion 21. A pair of standing plate portions 23 extending and a rectangular second plate portion 24 extending substantially horizontally across the lower ends of the pair of standing plate portions 23 are provided. Hereinafter, the direction across the pair of upright plate portions 23 may be referred to as the longitudinal direction of the upper bracket 16.

  The lower bracket 17 is disposed substantially horizontally so as to penetrate the upper end portion of the bolt main body 14 and to lock the upper end portion with the nut 27 and the bolt kinetic energy absorber 28, and the first plate portion 31. A pair of inclined plate portions 32 extending away from each other toward the upper side, a pair of standing plate portions 33 extending upward from the upper ends of the pair of inclined plate portions 32, and the upper ends of the pair of standing plate portions 33. And a second plate portion 34 that crosses. Hereinafter, the width direction of the band shape may be referred to as a band width direction, and the length direction may be referred to as a band length direction.

  The second plate portion 34 includes a pair of lower plate portions 35 extending substantially horizontally and substantially flush with each other in the band length direction from the upper ends of the pair of standing plate portions 33, and inner ends of the pair of lower plate portions 35. A pair of upper stepped plate portions 36 extending upward from the upper portion, and an upper step plate portion 37 extending substantially horizontally across the upper ends of the pair of upper stepped plate portions 36.

  Each of the pair of standing plate portions 33 is formed by a first standing plate portion 33 a formed by the first divided body 41 constituting the lower portion of the lower bracket 17 and a second divided body 42 constituting the upper portion of the lower bracket 17. It is comprised with the 2nd standing board part 33b. The first standing plate portion 33 a overlaps the outside of the second standing plate portion 33 b and is fastened by a pair of bolts 33 c arranged in the band width direction of the lower bracket 17. The first divided body 41 integrally includes a first plate portion 31, a pair of inclined plate portions 32, and a pair of first standing plate portions 33a, and the second divided body 42 includes a pair of second standing plate portions 33b and a second one. It has the board part 34 integrally. The second divided body 42 is thicker than the first divided body 41.

  The lower bracket 17 has a reinforcing pipe 14a that is inserted through the bolt body 14 so as to be movable up and down. The reinforcing pipe 14 a is made of a steel pipe and extends from the first plate portion 31 of the lower bracket 17 to the vicinity of the lower end portion of the bolt body 14. The reinforcement pipe 14a reinforces the bending of the long bolt body 14. The upper end portion of the reinforcing pipe 14a passes through the first plate portion 31 of the lower bracket 17 and protrudes upward, and the nut 27 and the bolt dynamic energy absorber 28 are locked to the upper end of the reinforcing pipe 14a.

  Referring also to FIG. 5, the lower bracket 17 is arranged so that the band length direction thereof is substantially orthogonal to the longitudinal direction of the upper bracket 16 in a plan view of the connector 15 (corresponding to the axial view of the suspension bolt 5). Is done. The second plate portion 34 of the lower bracket 17 is disposed so as to overlap the second plate portion 24 of the upper bracket 16 from above. The upper and lower brackets 16 and 17 each have a loop shape when viewed from the side, and are connected to each other in a chain shape. The lower bracket 17 is divided into the first and second divided bodies 41 and 42 to facilitate the connection with the upper bracket 16.

  The central portion of the upper plate portion 37 of the second plate portion 34 of the lower bracket 17 is abutted and supported by the top portion of the swing support portion 18. For example, a plate-shaped energy absorber 19 is sandwiched between the periphery of the swing support portion 18 in the second plate portion 24 of the upper bracket 16 and the pair of lower plate portions 35 of the lower bracket 17.

  The energy absorber 19 is made of, for example, a viscoelastic body and has, for example, a rectangular shape substantially equivalent to the second plate portion 24 of the upper bracket 16. For example, a rectangular through hole 19 a that penetrates the swing support portion 18 is formed at the center of the energy absorber 19. The energy absorber 19 is fixed to the second plate portion 24 of the upper bracket 16 and the pair of lower plate portions 35 of the lower bracket 17 by, for example, adhesion.

  As shown in FIG. 6, when the suspension equipment 7 vibrates due to an earthquake or the like, the movement in the horizontal direction is transmitted to the connector 15 as the swinging of the bolt body 14 and the lower bracket 17. At this time, the energy absorber 19 repeats compression and restoration between the second plate portion 24 of the upper bracket 16 and the pair of lower plate portions 35 of the lower bracket 17, so that the lower bracket 17 swings with respect to the upper bracket 16. While being allowed, a part of the vibration energy of the suspension equipment 7 is absorbed. Thereby, the vibration of the suspension equipment 7 is reduced and the transmission of the vibration to the base end portion of the suspension bolt 5 is suppressed.

  The upper end portion of the bolt main body 14 includes a nut 27 screwed over the first plate portion 31 of the lower bracket 17 and a bolt kinetic energy absorber 28 sandwiched between the nut 27 and the upper end of the reinforcing pipe 14a. Thus, the first plate portion 31 of the lower bracket 17 is locked. The bolt dynamic energy absorber 28 is made of an elastic body such as an elastomer, and has a cylindrical shape that has an outer diameter corresponding to a washer of the nut 27 and is inserted through the bolt body 14. As shown in FIG. 7, the upper end portion of the bolt main body 14 is movable upward with respect to the lower bracket 17, and can be moved downward and inclined by the amount of bending of the bolt kinetic energy absorber 28. .

  Thereby, the vibration of the suspension equipment 7 is directly transmitted to the bolt main body 14, but the transmission of the vibration to the lower bracket 17 is suppressed by the bending of the bolt dynamic energy absorber 28. Although the bolt dynamic energy absorber 28 receives the load of the suspension equipment 7, the bolt dynamic energy absorber 28 is compressed rather than pulled between the bolt main body 14 and the lower bracket 17, so there is no risk of cutting and high reliability.

When vibration of the suspension equipment 7 is transmitted to the lower bracket 17, the lower bracket 17 swings with respect to the upper bracket 16, and this energy is absorbed by the bending of the energy absorber 19 as described above.
Due to the deformation and restoration of these energy absorbers 19 and 28, the vibration energy of the suspension equipment 7 is attenuated and absorbed, the vibration is easily converged, the stress concentration at the base end portion of the suspension bolt 5 is alleviated and fatigued. Is suppressed.

As described above, the vibration suppression suspension structure 1 according to the above-described embodiment is provided with the connection tool 15 that combines the upper and lower brackets 16 and 17 at the base end of the suspension bolt 5 on the ceiling slab 2 side. Between the brackets 16 and 17, there is provided a swing support portion 18 that can relatively swing between them and receive the load of the lifting equipment 7, and is sandwiched between the upper and lower brackets 16 and 17 around the swing support portion 18. By providing the energy absorber 19, when the suspension equipment 7 vibrates due to an earthquake or the like, the movement of the lower bracket 17 with respect to the upper bracket 16 at the base end portion of the suspension bolt 5 swings around the fulcrum of the swing support portion 18. It is converted into motion, and by this swinging, the energy absorber 19 is bent around the swing support portion 18, whereby a part of the vibration energy of the hanging equipment 7 can be absorbed. That is, the bending moment acting on the base end portion of the suspension bolt 5 is reduced to reduce the deformation of the base end portion of the suspension bolt 5, and the vibration energy of the suspension equipment 7 can be absorbed to reduce the vibration.
Moreover, compared with the case where a brace is provided between the plurality of suspension bolts 5, even when the suspension equipment 7 is arranged across the beam, the degree of installation freedom is high, and vibration measures can be easily implemented.

  Further, a bolt kinetic energy absorber 28 is interposed between a portion of the lower bracket 17 through which the upper end portion of the bolt body 14 passes and a nut 27 screwed to the upper end portion of the bolt body 14. The vibration energy of the suspension equipment 7 can be absorbed also by the bolt dynamic energy absorber 28 while allowing the bolt main body 14 to move relative to the bolt dynamic energy absorber 28.

In addition, this invention is not restricted to the said embodiment, For example, fixation to the upper-and-lower brackets 16 and 17 of the energy absorber 19 is not restricted to adhesion | attachment, For example, fasteners, such as a fastener and a bracket, may be used. . On the other hand, the energy absorber 19 may not be fixed to at least one of the upper and lower brackets 16 and 17, and the lower bracket 17 may be movable upward with respect to the upper bracket 16. In this case, the bolt body 14 may be fixed to the lower bracket 17.
In the present embodiment, the swing support portion 18 is integrally formed with the upper bracket 16, but a swing support portion 18 that is a separate body from the upper bracket 16 may be fixed to the upward locking surface 16a. Further, the swing support portion 18 may be provided on the lower bracket 17 so as to be in contact with and supported by the upward locking surface 16 a of the upper bracket 16. Further, for example, a spherical swinging support portion 18 that is separate from the upper and lower brackets 16 and 17 may be sandwiched without being fixed to the upper and lower brackets 16 and 17. Further, the second plate portion 34 of the lower bracket 17 may be flat instead of stepped, and the upper and lower locking surfaces 17a and 17b may be flat.

Hereinafter, modified examples of the connector 15 will be described with reference to FIGS.
The connecting tool 15 ′ of this modification is different from the connecting tool 15 in that it has a steel ball (rolling element) 18 ′ instead of the swing support portion 18, and other configurations are the same as those of the above-described embodiment. The same reference numerals are assigned and detailed description is omitted.

  The connector 15 ′ includes a lower bracket 17 ′ having a flat second plate portion 34 ′ with respect to the lower bracket 17, an upper bracket 16 ′ having a configuration in which the lower bracket 17 ′ is turned upside down, and an upper bracket 16. A steel ball 18 ′ sandwiched between the “flat upward locking surface 16 a” and the flat downward locking surface 17 a ′ of the lower bracket 17 ′ and receiving the load of the suspension equipment 7, and the steel ball 18 ′ A holding plate 38 that has a central hole 38a that is freely fitted to allow rolling and abuts on the downwardly engaging surface 17a ′ from below, and energy absorption that is sandwiched between the lower surface of the retaining plate 38 and the upwardly engaging surface 16a ′. And a body 19.

  The upper bracket 16 ′ is separated from the lower surface 3 of the ceiling slab 2 and is fixed to the anchor bolt 13 by a pair of upper and lower nuts 13 a. The upper end portion of the reinforcing pipe 14a does not protrude above the first plate portion 31 of the lower bracket 17 ′, and a nut 27 and a bolt kinetic energy absorber 28 fixed to the double nut are locked on the upper surface of the first plate portion 31. Is done. The first divided body 41 and the second divided body 42 of the upper bracket 16 ′ and the lower bracket 17 ′ have substantially the same thickness.

  According to this configuration, in addition to the function and effect of the above-described embodiment, the swing support portion is provided with the steel ball 18 ′ that is rotatably held on the downward locking surface 17 a ′ instead of the swing support portion 18. Oscillation about the (steel ball 18 ') becomes smoother and a part of vibration energy can be absorbed well. The steel ball 18 ′ may be held on the upward locking surface 16 a ′ via the holding plate 38.

  And the structure in the said embodiment and modification is an example of this invention, A various change is possible in the range which does not deviate from the summary of the said invention, such as combining each structure suitably.

DESCRIPTION OF SYMBOLS 1 Vibration suppression suspension structure 2 Ceiling slab 5 Suspension bolt 7 Suspension equipment 14 Bolt main body 14a Reinforcement pipe (bolt penetration part)
15, 15 'connector 16, 16' upper bracket 16a, 16a 'upward locking surface 17, 17' lower bracket 17a, 17a 'upper downward locking surface 18 swing support portion 18' steel ball (swing support portion)
19 Energy absorber 28 Bolt dynamic energy absorber 31 First plate part (bolt penetration part)

Claims (3)

In the vibration suppression suspension structure that reduces the vibration of the suspension equipment suspended from the ceiling slab with suspension bolts,
At the base end of the suspension bolt on the ceiling slab side, a connection tool for suspending a bolt main body fixed to the suspension facility equipment is provided.
The connector forms an upper bracket fixed to the ceiling slab and forming an upward locking surface, and a downward locking surface fixed to the bolt body and engaged with the upward locking surface from above. A lower bracket, a swing support that protrudes from one of the upward locking surface and the downward locking surface and makes the other swingably contacted and receives the load of the suspension equipment, and the periphery of the swing support A vibration suppressing suspension structure comprising: an energy absorber disposed between the upward locking surface and the downward locking surface.   The vibration suppression suspension structure according to claim 1, wherein a bolt kinetic energy absorber is interposed between a bolt penetrating portion that penetrates the bolt body in the lower bracket and the bolt body.   3. The vibration suppressing suspension structure according to claim 1, wherein the swing support portion includes a rolling element that is rotatably held on one of the upward locking surface and the downward locking surface. 4.

Images