JP2014015772A - Vibration-suppressing suspension structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deformation of hanging bolts while enhancing the degree of freedom of installation by dispensing with a brace between the hanging bolts, in a vibration-suppressing suspension structure reducing vibrations of a hanging device suspended from a ceiling slab by the hanging bolts.SOLUTION: A cylindrical body 13 is provided which is elongated across an undersurface 3 of a ceiling slab 2 and a top surface 8 of a suspension device 7 in the state of having each hanging bolt 5 inserted therethrough and which brings upper and lower ends 14 and 15 into pressure contact with them. The upper end 14 of the cylindrical body 13 is provided with an upper flange part 16 abutting on the undersurface 3 of the ceiling slab 2, and the lower end 15 of the cylindrical body 13 is provided with a lower flange part 17 abutting on the top surface 8 of the suspension device 7.

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 was examined, it was found that stress was concentrated on the base of the suspension bolt (upper end fixed to the ceiling slab), and plastic deformation accumulated after yielding of the base, leading to breakage of the suspension bolt base. 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-described problems, the present invention provides a vibration suppressing suspension structure for reducing vibration of a suspension facility device suspended from a ceiling slab by a suspension bolt, and the bottom surface of the ceiling slab and the suspension are inserted through the suspension bolt. It extends over the upper surface of the facility equipment, and has a cylindrical body in which the upper end is brought into contact with the lower surface of the ceiling slab and the lower end is brought into contact with the upper surface of the suspended equipment.
According to this configuration, the vibration of the suspension equipment can be transmitted directly to the ceiling slab via the cylinder, and the bending moment acting on the suspension bolt can be reduced to reduce deformation.
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.

The present invention includes an upper flange portion that is provided at the upper end portion and contacts the lower surface of the ceiling slab, and a lower flange portion that is provided at the lower end portion and contacts the upper surface of the suspension equipment. By having it, the bending moment which acts on a suspension bolt by the support pressure of an up-and-down flange part can be reduced effectively.
The present invention includes a plurality of the suspension bolts, and the cylinders are attached to at least three of the plurality of suspension bolts arranged in a triangular shape in plan view. The vibration of the suspension equipment and thus the vibration of the suspension equipment can be suppressed, and the vibration of the suspension equipment can be effectively reduced by the three-point support by the plurality of cylinders.

  According to the present invention, the bracing between the suspension bolts is eliminated to increase the degree of freedom of installation, and the stress concentration and deformation at the base of the suspension bolt are suppressed, and the suspension structure is improved in resistance to vibration caused by an earthquake. It is possible to prevent the suspension equipment from dropping due to the breakage of the bolt.

It is a front view of the vibration suppression suspension structure in the first embodiment of the present invention. It is a top view of the vibration suppression suspension structure in a first embodiment of the present invention. It is a front view of the vibration suppression suspension structure in 2nd embodiment of this invention. It is a top view of the vibration suppression suspension structure in a second embodiment of the present invention. It is a front view of the vibration suppression suspension structure in 3rd embodiment of this invention. It is a top view of the vibration suppression suspension structure in a third embodiment of the present invention. It is a front view of the vibration suppression suspension structure in 4th embodiment of this invention. It is a top view of the vibration suppression suspension structure in 4th embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<First embodiment>
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. At the four corners of the suspension equipment 7 in plan view (top view), the lower ends of the suspension bolts 5 extending in the vertical direction are fastened and fixed to the flange 9 in a state of passing through the flange 9. Reference numeral 12 in the drawing is screwed to the lower end of the suspension bolt 5 below the flange 9 and is tightened so as to sandwich a cylinder 13 described later between the lower surface 3 of the ceiling slab 2 and the upper surface 8 of the suspension equipment 7. Indicates the lower nut. 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.

The vibration suppression suspension structure 1 includes four cylinders 13 through which a total of four suspension bolts 5 are inserted at four corners of a rectangular shape in plan view of the suspension equipment 7.
Each cylinder 13 consists of circular steel pipes, such as a gas pipe, for example, and each suspension bolt 5 is penetrated with a certain amount of play. Each cylinder 13 extends over the upper surface 8 (including the upper surface of the flange 9) of the suspension equipment 7 at the installation position and the lower surface 3 of the ceiling slab 2, and the upper end portion 14 contacts the lower surface 3 of the ceiling slab 2. The lower end 15 is brought into contact with the upper surface 8 of the hanging equipment 7 while being in contact therewith. In this state, each cylinder 13 is clamped between the lower surface 3 of the ceiling slab 2 and the upper surface 8 of the suspension equipment 7 by tightening the lower nut 12 screwed to the lower end of each suspension bolt 5. Fixed. Thereby, while the upper end part 14 of each cylinder 13 press-contacts to the lower surface 3 of the ceiling slab 2, the lower end part 15 press-contacts to the upper surface 8 of the hanging installation equipment 7.

  Each cylindrical body 13 has an upper flange portion 16 that contacts the lower surface 3 of the ceiling slab 2 at the upper end portion 14, and a lower flange portion 17 that contacts the upper surface 8 of the suspension equipment 7 at the lower end portion 15. These upper and lower flange portions 16 and 17 disperse the support pressure of the upper and lower end portions 14 and 15 of each cylinder 13 and increase the vibration suppressing effect. The length of each cylindrical body 13 is arbitrarily set, for example, to such an extent that the connecting body is separated below the beam 4.

  As described above, according to the vibration suppression suspension structure 1 in the above-described embodiment, the suspension bolts 5 are inserted to extend over the lower surface 3 of the ceiling slab 2 and the upper surface 8 of the suspension equipment 7. By providing the cylindrical body 13 that presses the portions 14 and 15, the vibration of the suspension equipment 7 can be transmitted directly to the ceiling slab 2 via each cylindrical body 13, and the bending moment acting on each suspension bolt 5 is reduced. Deformation can be reduced. 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.

  Moreover, while providing the upper flange part 16 contact | abutted to the lower surface 3 of the ceiling slab 2 in the upper end part 14 of the cylinder 13, the lower flange part 17 contact | abutted to the upper surface 8 of the suspension equipment 7 is provided in the lower end part 15 of the cylinder 13. By providing, the shaking of the cylinder 13 and the suspension bolt 5 and hence the suspension equipment 7 can be effectively suppressed by the support pressure of the upper and lower end portions 14 and 15 of the cylinder 13, and the input of vibration to the suspension bolt 5 can be further reduced. .

<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS.
The vibration suppression suspension structure 101 of this embodiment is different from the first embodiment in that, for example, an intermediate suspension bolt 118 is separately provided in the middle portion of the long side portion of the suspension equipment 7 in a rectangular shape in plan view, and a plurality of suspension bolts are provided. 5 and the intermediate suspension bolt 118 are particularly different in that the cylindrical body 13 is attached to a part thereof. The other components that are the same as those in the above embodiment are given the same reference numerals, and detailed description thereof is omitted.

  The plurality of suspension bolts 5 and intermediate suspension bolts 118 are formed of a common bolt shaft. Of these all suspension bolts 5, 118, the cylindrical body 13 is attached to three that are arranged in a triangular shape in plan view of the suspension equipment 7. Specifically, the cylindrical body 13 is attached to the suspension bolts 5 positioned at both ends of the lower long side portion in the plan view rectangular shape, and the upper long side portion in the plan view rectangular shape in the drawing. The cylindrical body 13 is attached to the intermediate suspension bolt 118 located at the intermediate portion of the cylinder.

  Each cylinder 13 is clamped between the lower surface 3 of the ceiling slab 2 and the upper surface 8 of the suspension equipment 7 by tightening the lower nut 12 screwed to the lower end portion of the suspension bolts 5 and 118 to be inserted. Fixed. Reference numeral 211 in the drawing denotes an upper nut that is screwed to the lower end portion of the suspension bolts 5 and 118 to which the cylindrical body 13 is not attached, and that clamps the flange 9 together with the lower nut 12.

As described above, according to the vibration suppression suspension structure 101 in the above embodiment, in addition to the function and effect of the first embodiment, three cylinders arranged in a triangular shape in a plan view among the plurality of suspension bolts 5 and 118. By mounting the body 13, vibrations of the suspension bolts 5 118 inserted through contact of the end portions of the respective cylinders 13, and hence vibrations of the suspension equipment 7, are suppressed, and three-point support by the plurality of cylinders 13 is achieved. The vibration of the suspension equipment 7 can be effectively reduced.
That is, the vibration of the suspension equipment 7 can be alleviated to some extent by mounting at least one cylinder 13 among the plurality of suspension bolts 5 and 118, but as described above, at least three lines arranged in a triangular shape in plan view. By attaching the cylinder 13 to the suspension bolts 5 and 118, the vibration of the suspension equipment 7 can be reduced not only by the rigidity of each cylinder 13 but also by the structural rigidity of the three supports.
The cylindrical body 13 may be attached to all of the six suspension bolts 5 and 118. When only four suspension bolts 5 are provided as in the first embodiment, the cylinder 13 may be attached to only three of them.

<Third embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS.
The vibration suppression suspension structure 201 of this embodiment is different from the first embodiment in that a total of four cylinders 13 located at the four corners of the rectangular shape of the suspension equipment 7 are four sides of the rectangular shape in the plan view. Especially, it is different in that it includes four connecting plates 221 that are connected along each of the above. The other components that are the same as those in the above embodiment are given the same reference numerals, and detailed description thereof is omitted.

  Each connecting plate 221 is formed of a strip-shaped steel plate that extends along each of the four sides of the rectangular shape in plan view and forms a flat plate shape along each suspension bolt 5, and is disposed below the beam 4. Each of the connecting plates 221 is connected to each of the pair of cylinders 13 to be connected by welding, and each end of the pair of connecting pieces 222 is detachably connected by a fastening member 225 such as a bolt. The board body 223 is divided. The long strip-shaped connecting plate 221 has a pair of divided portions 224 including a pair of connecting pieces 222 and both ends of the plate main body 223, so that a pair of small assemblies in which the connecting pieces 222 are fixed to the cylindrical body 13. After installation on the pair of suspension bolts 5, it is possible to perform a step-by-step assembly operation of connecting the pair of small assemblies with the plate body 223. The division part 224 has a bolt hole 226 that is long in the length direction of the connecting plate 221, and also functions as a length adjusting mechanism that absorbs differences in pitch and errors between the suspension bolts 5 to be connected.

  As described above, according to the vibration suppression suspension structure 201 in the above embodiment, in addition to the function and effect of the first embodiment, the connection plate 221 that connects the pairs of the plurality of cylindrical bodies 13 is provided. Thus, the plurality of suspension bolts 5 can be integrally connected to reinforce the entire suspension structure, and vibrations of the suspension equipment 7 and the suspension bolts 5 can be reduced. In order to reduce vibration while suppressing the installation space of the suspension structure, the vertical width of the connecting plate 221 is preferably about 1/3 to 1/4 of the entire length of the suspension bolt 5.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
In the vibration suppression suspension structure 301 of this embodiment, a thread is formed on the outer peripheral surface of the cylinder 13 to form the cylinder 313, and the end of the connecting plate 221 is connected to the cylinder 313 with respect to the third embodiment. This is particularly different in that a fitting cylinder 327 to be externally fitted is fixed, and the vertical position of the fitting cylinder 327 and thus the connecting plate 221 can be adjusted by upper and lower intermediate nuts 328 and 329 screwed to the outer periphery of the cylinder 313. The other components that are the same as those in the above embodiment are given the same reference numerals, and detailed description thereof is omitted.

  Each fitting cylinder 327 is made of, for example, a circular steel pipe such as a gas pipe, and is externally fitted to each cylinder body 313 with a play that is relatively movable. Each fitting cylinder 327 is screwed into an intermediate portion of a cylindrical body 313 to be inserted, and upper and lower intermediate nuts 328 and 329 for tightening the fitting cylinder 327 from above and below, and an arbitrary height of an intermediate portion of the cylindrical body 313 to be inserted. It is fixed to In the present embodiment, each fitting cylinder 327 is fixed so that each connecting plate 221 is separated below the beam 4.

  Each connecting plate 221 has a pair of connecting pieces 222 welded to each of a pair of fitting cylinders 327 to be connected, and an end portion of each of the pair of connecting pieces 222 can be attached and detached by a fastening member 225 such as a bolt. It is divided into a plate body 223 to be joined. For the convenience of attaching the fitting cylinder 327 and the upper and lower intermediate nuts 328 and 329, the lower flange portion 17 of each cylinder 313 is eliminated.

  As described above, according to the vibration suppression suspension structure 301 in the above embodiment, the vertical position of the coupling plate 221 and the vertical position of the coupling plate 221 can be adjusted by making the vertical position of the coupling plate 221 adjustable in addition to the effects of the third embodiment. The degree of freedom in setting the vertical position and the like is increased, and effective vibration countermeasures can be easily implemented.

In addition, this invention is not restricted to the said embodiment, For example, the number of suspension bolts is not restricted to each embodiment, It does not ask | require even number or odd number (including one). In the third and fourth embodiments, an energy absorber such as an elastic body may be interposed in the divided portion 224 of the connecting plate 221.
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.

1, 101, 201, 301 Vibration suppression suspension structure 2 Ceiling slab 3 Lower surface 5 Suspension bolt 7 Suspension equipment 8 Upper surface 13,313 Cylindrical body 14 Upper end portion 15 Lower end portion 16 Upper flange portion 17 Lower flange portion 118 Intermediate suspension bolt 221 Connection Board

Claims (3)

In the vibration suppression suspension structure that reduces the vibration of the suspension equipment suspended from the ceiling slab with suspension bolts,
The suspension bolt is inserted and extends over the lower surface of the ceiling slab and the upper surface of the suspension equipment, and the upper end is brought into contact with the lower surface of the ceiling slab and the lower end is brought into contact with the upper surface of the suspension equipment. A vibration-suppressing suspension structure comprising a cylindrical body. The cylindrical body has an upper flange portion provided at the upper end portion and in contact with the lower surface of the ceiling slab, and a lower flange portion provided at the lower end portion and in contact with the upper surface of the suspension equipment. The vibration suppression suspension structure according to claim 1. 3. The vibration suppression suspension structure according to claim 1, wherein the suspension body includes a plurality of the suspension bolts, and the cylinders are attached to at least three of the suspension bolts arranged in a triangular shape in plan view. .

Images