JP2014031694A - Vibration-suppressing suspension structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress cumulative plastic deformation of hanging bolts while increasing the degree of freedom of installation by dispensing with a brace between the hanging bolts, in a vibrational energy-absorbing suspension structure reducing vibrations of suspension equipment suspended from a ceiling slab by the hanging bolts.SOLUTION: A connector 15, in which upper and lower brackets 16 and 17 are combined together, is provided at a ceiling slab-side base end of a hanging bolt. An energy absorber 18, which is sandwiched between locking surfaces 16a and 17a of the upper and lower brackets 16 and 17 to bear a load of suspension equipment, is interposed between the upper and lower brackets 16 and 17 of the connector 15.

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 is sandwiched between the upward locking surface and the downward locking surface to receive a load of the suspension equipment. And an energy absorber.

According to this configuration, even if the suspension equipment vibrates due to an earthquake or the like, the transmission of the vibration can be suppressed by the energy absorber at the base end of the suspension bolt, and the bending moment acting on the base end of the suspension bolt can be reduced. Thus, deformation of the base end portion of the suspension bolt can be reduced. The energy absorber may be an elastic body such as synthetic rubber 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 addition, by using the energy absorber not by pulling but by sandwiching it, it is easy to ensure the suspension strength of the suspension equipment, and the suspension reliability can be improved.
In addition, since the coupling tool engages both the locking surfaces via the energy absorber, the convergence of vibration is enhanced and the lower bracket can be stably supported by the upper bracket.

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 suspension equipment can be absorbed while being allowed by the bending of the kinetic energy absorber.
In the present invention, if the upper and lower brackets have a configuration in which the upper and lower brackets are turned upside down, the cost can be reduced by sharing the parts.

  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. It is a perspective view of the coupling tool of the suspension bolt of the said vibration suppression suspension structure. 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.

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 rectangular shape in plan view of the suspension equipment 7 are provided with a connector 15 in which upper and lower brackets 16 and 17 are combined at each base end portion. . 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. An energy absorber 18 sandwiched between the surface 16a and the downward locking surface 17a formed by the lower bracket 17; The connector 15 locks the lower bracket 17 to the upper bracket 16 via the energy absorber 18 and absorbs the movement energy of the lower bracket 17 relative to the upper bracket 16.

  The upper bracket 16 is formed by forming a strip-shaped steel material in a loop shape. The upper bracket 16 is disposed substantially horizontally so as to pass through the anchor bolt 13 and is fixed to the anchor bolt 13 with a nut 27 from the first plate portion 21 toward the lower side from both side ends. A pair of inclined plate portions 22 extending so as to extend, a pair of standing plate portions 23 extending downward from the lower ends of the pair of inclined plate portions 22, and a second plate extending substantially horizontally between the lower ends of the pair of standing plate portions 23. Part 24. 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.

  Each of the pair of upright plate portions 23 is formed by a first upright plate portion 23 a formed by the first divided body 25 constituting the upper portion of the upper bracket 16 and a second divided body 26 constituting the lower portion of the upper bracket 16. It is comprised with the 2nd standing board part 23b. The first standing plate portion 23a overlaps the outside of the second standing plate portion 23b, and is fastened by a pair of bolts 23c arranged in the band width direction of the upper bracket 16. The first divided body 25 integrally includes a first plate portion 21, a pair of inclined plate portions 22, and a pair of first standing plate portions 23a, and the second divided body 26 includes a pair of second standing plate portions 23b and a second one. It has the board part 24 integrally. The second divided body 26 is thicker than the first divided body 25.

Similarly to the upper bracket 16, the lower bracket 17 is formed by forming a strip-shaped steel material in a loop shape. The lower bracket 17 has a configuration in which the same configuration as that of the upper bracket 16 is turned upside down.
That is, the lower bracket 17 is disposed substantially horizontally so as to penetrate the upper end portion of the bolt body 14 and to lock the upper end portion with the nut 27 and the bolt kinetic energy absorber 28, and the first plate A pair of inclined plate portions 22 extending away from each other from both ends of the portion 21, a pair of standing plate portions 23 extending upward from the upper ends of the pair of inclined plate portions 22, and upper ends of the pair of standing plate portions 23 And a second plate portion 24 extending substantially horizontally therebetween.

  Each of the pair of upright plate portions 23 is formed by a first upright plate portion 23 a formed by the first divided body 25 constituting the lower portion of the lower bracket 17 and a second divided body 26 constituting the upper portion of the lower bracket 17. It is comprised with the 2nd standing board part 23b. The first standing plate portion 23 a overlaps the outside of the second standing plate portion 23 b and is fastened by a pair of bolts 23 c arranged in the band width direction of the lower bracket 17. The first divided body 25 integrally includes a first plate portion 21, a pair of inclined plate portions 22, and a pair of first standing plate portions 23a, and the second divided body 26 includes a pair of second standing plate portions 23b and a second one. It has the board part 24 integrally. The second divided body 26 is thicker than the first divided body 25.

  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 21 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 21 of the lower bracket 17 and protrudes upward. 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 disposed so as to be substantially perpendicular to the upper bracket 16 in a plan view (corresponding to the axial view of the suspension bolt 5). The second plate portion 24 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 are connected to each other in a chain shape. The upper and lower brackets 16 and 17 are divided into first and second divided bodies 25 and 26, respectively, so as to facilitate the mutual connection. An integral structure in which at least one of the upper and lower brackets 16 and 17 is not divided may be used.

  Between the substantially horizontal upper surface (the upward locking surface 16 a) of the second plate portion 24 of the upper bracket 16 and the substantially horizontal lower surface (the downward locking surface 17 a) of the second plate portion 24 of the lower bracket 17. For example, a plate-shaped energy absorber 18 is sandwiched.

  The energy absorber 18 is made of an elastic body such as an elastomer, and has a square shape with a side length corresponding to the width of the upper and lower brackets 16 and 17 in the band width direction, for example. The energy absorber 18 is fixed to the second plate portion 24 of each of the upper and lower brackets 16 and 17 by adhesion or the like, for example. When the suspension equipment 7 vibrates due to an earthquake or the like, the energy absorber 18 allows the upper and lower brackets 16 and 17 to move relative to each other due to its own deflection and absorbs a part of the energy of the vibration. Reduce the vibration of the device 7.

  That is, as shown in FIG. 6, the relative movement in the horizontal direction of the upper and lower brackets 16 and 17 is permitted by bending the energy absorber 18 so as to be sheared along both the locking surfaces 16a and 17a. Transmission of the vibration to the base end portion of the bolt 5 is suppressed. Further, the relative inclination of the upper and lower brackets 16 and 17 is allowed by the energy absorber 18 being bent obliquely between the both locking surfaces 16a and 17a.

  As shown in FIG. 5, each of the second plate portions 24 of the upper and lower brackets 16 and 17 has a rectangular shape whose length in the band length direction is longer than the width in the band width direction. Spaces S for relatively moving the mating second plate portion 24 are secured on both sides in the band length direction of the second plate portions 24 of the upper and lower brackets 16 and 17.

Since the upper and lower brackets 16 and 17 are engaged with each other by bringing the locking surfaces 16a and 17a into surface contact with each other via the energy absorber 18, it is easy to converge the vibration of the hanging equipment 7 and there is no vibration. The support of the suspension equipment 7 is stabilized.
Since the energy absorber 18 is used by compressing rather than being pulled between the upper and lower brackets 16 and 17, there is no possibility of cutting and the reliability is high.
Since the second plate portions 24 of the upper and lower brackets 16 and 17 are longer in the band length direction than the width in the band width direction of the other party, a bending moment acts on both sides in the band length direction. When the plate thickness is thicker than that of the first divided body 25, rigidity against the bending moment is ensured.

  The upper end portion of the bolt body 14 includes a nut 27 screwed over the first plate portion 21 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 21 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, even if the suspension equipment 7 vibrates due to an earthquake or the like, this vibration is directly transmitted to the bolt body 14, but the transmission of the vibration to the lower bracket 17 is suppressed. 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.

  Further, the vibration transmitted to the lower bracket 17 is suppressed from being transmitted to the upper bracket 16 through the energy absorber 18. Due to the deformation and restoration of these energy absorbers 18 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, in the vibration suppression suspension structure in the above embodiment, the coupling tool 15 that combines the upper and lower brackets 16 and 17 is provided at the base end portion of the suspension bolt 5 on the ceiling slab 2 side. Even if the suspension equipment 7 vibrates due to an earthquake or the like by interposing the energy absorber 18 sandwiched between the locking surfaces 16a and 17a and receiving the load of the suspension equipment 7 between the 16 and 17 The transmission of the vibration can be suppressed by the energy absorber 18 at the base end portion of the suspension bolt 5, and the bending moment acting on the base end portion of the suspension bolt 5 can be reduced to reduce the deformation of the base end portion of the suspension bolt 5. .

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, by using the energy absorber 18 not in a tension state but in a sandwiched state, it is easy to ensure the suspension strength of the suspension equipment 7 and the suspension reliability can be improved.
In addition, since the connecting tool 15 engages both the locking surfaces 16a and 17a via the energy absorber 18, the convergence of vibration is enhanced and the suspension equipment 7 can be stably supported.

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 while allowing the bolt main body 14 to move relative to the bolt 17 by the bolt dynamic energy absorber 28.
In addition, since the upper and lower brackets 16 and 17 have a configuration in which the upper and lower brackets are turned upside down, the cost can be reduced by sharing parts.

The present invention is not limited to the above-described embodiment. For example, the fixing of the energy absorber 18 to the upper and lower brackets 16 and 17 is not limited to adhesion. For example, a fastener such as a fastener or a bracket may be used. The structure which winds the body 18 around the 2nd board part 24 of the upper-and-lower brackets 16 and 17 may be sufficient. On the other hand, the energy absorber 18 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.
And the structure in the said embodiment 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 the structure of each embodiment 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)
DESCRIPTION OF SYMBOLS 15 Connector 16 Upper bracket 16a Upward locking surface 17 Lower bracket 17a Downward locking surface 18 Energy absorber 28 Bolt dynamic energy absorber

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 vibration suppressing suspension structure comprising: a lower bracket; and an energy absorber sandwiched between the upward locking surface and the downward locking surface and receiving a load of the suspension equipment.   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.   The vibration suppression suspension structure according to claim 1, wherein the upper and lower brackets have a configuration in which the upper and lower brackets are inverted with respect to each other.

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