JP7644671B2 - Anti-vibration structure - Google Patents

Description

The present invention relates to a vibration prevention structure that connects the spring beams that spring outward from the outer columns between upper and lower floors with vibration prevention materials to prevent vibration of the spring beams and the spring slabs supported by the spring beams.

Patent Document 1 (see especially paragraph 0007, Figures 11 and 12, etc.) discloses a configuration in which an internal mullion Ma erected at the end of a balcony is connected at its upper and lower ends to the balcony ceiling 3 on the upper floor side and the balcony floor 1 on the lower floor side by L-shaped brackets 2, thereby functioning as a reinforcing material (vibration prevention material) that reinforces the balcony on each floor.

Patent No. 3170569

Generally, the mullion materials that support the curtain wall are mullions that separate exterior materials such as glass, and therefore need to have looseness in the joints with the framework to absorb construction errors. However, as in Patent Document 1, when the mullion materials themselves are used as structural materials such as the reinforcement materials (vibration prevention materials), they need to be joined with welding or high-strength bolts to avoid looseness, making this difficult to apply. In addition, if the frameworks are connected together with vibration prevention materials, there is a concern that the vibration prevention materials may be placed in positions that are not appropriate from a design perspective.
In light of this situation, the main objective of the present invention is to provide a technology for a vibration prevention structure in which a protruding beam that protrudes outward from an exterior column is connected between upper and lower floors with vibration prevention material to prevent vibration of the protruding beam and the protruding slab supported by the protruding beam, which can realize details that take design into consideration while appropriately suppressing floor vibration of the protruding slab.

The first characteristic configuration of the present invention is a vibration prevention structure in which a spring beam extending outward from an outer column is connected between upper and lower floors by a vibration prevention material to prevent vibration of the spring beam and the spring slab supported by the spring beam,
The vibration-proof material is embedded inside the marion material of the curtain wall located outside the exterior columns.

According to this configuration, instead of using the mullion material itself, which is a mullion that separates exterior materials such as glass at the opening of the curtain wall located outside the exterior columns, as the vibration isolating material, the spring beams are firmly connected between the upper and lower floors by the vibration isolating material provided separately from the mullion material, and vibration of the spring beams and spring slabs can be appropriately prevented. For this reason, the mullion material can be provided with looseness at the joints to the framework to absorb construction errors. And because the vibration isolating material is embedded inside the mullion material, it is possible to prevent the vibration isolating material from being placed in a position that is not appropriate from the design point of view.
Therefore, according to the present invention, in a vibration prevention structure in which the spring beams that protrude outward from the exterior columns are connected between the upper and lower floors with vibration prevention materials to prevent vibration of the spring beams and the spring slabs supported by the spring beams, it is possible to realize details that take design into consideration while appropriately suppressing floor vibrations of the spring beams and the spring slabs.

The second characteristic configuration of the present invention is that the protruding slab is a two-way protruding slab that protrudes in a first horizontal direction and a second horizontal direction intersecting the first horizontal direction,
The spring beam is an oblique spring beam that protrudes from the corner post in an oblique direction that is a combination of the first horizontal direction and the second horizontal direction.

According to this configuration, even for a two-way spring slab that springs out in two directions, the first horizontal direction and the second horizontal direction, a diagonal spring beam that springs out in the diagonal direction from the corner column is provided and supported by the diagonal spring beam, and the diagonal spring beam is connected between the upper and lower floors by vibration prevention materials, so that vibration of the diagonal spring beam and the two-way spring slab supported by the diagonal spring beam can be appropriately prevented.

The third characteristic feature of the present invention is that one of the upper and lower ends of the vibration isolator is joined to the spring beam by a bolt, and the other is joined to the spring beam by welding.

According to this configuration, one of the upper and lower ends of the vibration isolating material is joined to the spring beam by a bolt, so that it is possible to appropriately absorb construction errors of the marion material in which the vibration isolating material is built. Meanwhile, the other of the upper and lower ends of the vibration isolating material is joined to the spring beam by welding, so that the end of the vibration isolating material is firmly fixed to the spring beam, and vibration of the spring beam can be appropriately suppressed.
Furthermore, by joining the lower end of the vibration isolating material to the lower protruding beam by welding, the welding work at the joint can be carried out easily while facing downward.

The fourth characteristic feature of the present invention is that the vibration-isolating material is made of solid steel.

With this configuration, solid steel material that can withstand both tensile and compressive forces is used as the vibration-proofing material that connects the protruding beams between the upper and lower floors, so that the vibration-proofing material between the upper and lower protruding beams can provide a vibration-proofing effect.

A plan view of a protruding slab portion of a building in which the vibration prevention structure of this embodiment is adopted. An enlarged plan view of a corner of the curtain wall of the building shown in FIG. Enlarged plan view of the diagonal protruding beam FIG. 4 is an elevation view taken along the arrow a in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vibration prevention structure according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the vibration prevention structure of this embodiment (hereinafter referred to as "this vibration prevention structure") is adopted in a building having a protruding slab 8 supported by a protruding beam 4 that protrudes outward from an outer column 1 as a structure for preventing vibration of the protruding beam 4 and the protruding slab 8.

Furthermore, in this embodiment, the cantilever slab 8 is configured as a two-way cantilever slab 8 that cantilevers in the first horizontal direction X and the second horizontal direction Y that perpendicularly intersects the first horizontal direction X. As the cantilever beam 4, in addition to the first cantilever beam 4X that cantilever from the outer column 1 in the first horizontal direction X and the second cantilever beam 4Y that cantilever from the outer column 1 in the second horizontal direction Y, a diagonal cantilever beam 4A that cantilever from the corner column 2 of the outer column 1 in a diagonal direction (hereinafter sometimes referred to as "cantilever direction A") that is a combination of the first horizontal direction X and the second horizontal direction Y is provided. In addition, a balcony 26 supported by the cantilever beam 4 is provided outside the cantilever slab 8.
As shown in Figures 1 and 4, this vibration prevention structure is configured to prevent vibration of the diagonal spring beam 4A and the two-way spring slab 8 supported by the diagonal spring beam 4A by connecting the tip end 4a in the spring direction A of the diagonal spring beam 4A, which springs out from the corner post 2 in a diagonal direction, with a vibration prevention material 10 between the upper and lower floors.

This vibration prevention structure employs a configuration that allows for the realization of design-conscious details while appropriately suppressing floor vibrations of the protruding slab 8, and this configuration is described below.
A building equipped with this vibration prevention structure has a curtain wall 20 located outside the exterior columns 1. The curtain wall 20 is constructed by lining up a number of mullion materials at predetermined intervals between the protruding slabs 8 of the upper and lower floors, and fitting exterior materials into the openings between adjacent mullion materials.

As shown in FIG. 2, the mullion material 22 installed at the outer corner of the corner column 2 is configured in an arrowhead shape with a corner mullion 23 in which two mutually orthogonal glass sheets 21 are fitted as exterior materials, and a back mullion 24 provided along the inside of the corner mullion 23. The vibration prevention material 10 that connects the tip 4a (see FIG. 4) of the diagonal spring beam 4A between the upper and lower floors is inserted inside the mullion material 22 in the curtain wall 20. In detail, the corner mullion 23 and the back mullion 24 are made of hollow aluminum extrusions formed by extruding an aluminum alloy, and the vibration prevention material 10 is installed inside the internal space of the back mullion 24. With this configuration, the mullion material 22 itself does not function as a vibration prevention material, but the vibration prevention material 10 provided separately from the mullion material 22 appropriately prevents the vibration of the diagonal spring beam 4A and the two-way spring slab 8. Therefore, the mullion material 22 can be provided with looseness at the joints with the protruding slabs 8 of the upper and lower floors to absorb construction errors. On the other hand, the vibration prevention material 10 is built into the back mullion 24 and hidden, so the deterioration of the design due to exposure to the outside is avoided.

As shown in FIG. 2, a positioning plate 25 is provided inside the back mullion 24, with the front surface of the vibration isolation material 10 abutting along the protruding direction A. This allows the vibration isolation material 10 to be easily installed inside the back mullion 24 with the front surface abutting against the positioning plate 25.

The vibration isolating material 10 is made of solid steel material in the shape of a rod extending in the vertical direction and having a horizontal cross section that is rectangular with a long side parallel to the projection direction A and a short side perpendicular thereto. With this configuration, as shown in Fig. 4, the solid steel material used as the vibration isolating material 10 that connects the tip portions 4a of the projection beams 4A between the upper and lower floors can withstand both tensile and compressive forces, so that the vibration isolating material 10 that is stretched between the upper and lower projection beams 4A provides a good vibration prevention effect.
In order to prevent the vibration isolation material 10 from bearing a long-term load, it is desirable to install the vibration isolation material 10 after the construction of the building's framework has been completed.

The method of joining the upper and lower ends of the vibration isolators 10 to the diagonal spring beams 4A on the upper and lower floors in the installation work of the vibration isolators 10 will be described in detail below with reference to Figs.
The spring beam 4A is composed of an H-shaped steel having an upper flange 4b and a lower flange 4c, and a joint member 6 having a T-shaped cross section and an upper flange 6a that is embedded in the spring slab 8 and exposed on the upper surface of the spring slab 8 is welded to the upper surface of the upper flange 4b at the tip 4a. In addition, the lower flange 4c of the spring beam 4A is made wider than the upper flange 4b by welding a plate to it in order to secure a joint portion for the bolt 14 described later.

The upper end of the vibration isolator 10 is joined to the tip 4a of the upper spring beam 4A by a bolt 14. That is, at the upper end of the vibration isolator 10, an upper end vertical plate 12 is welded to the side of the vibration isolator 10 in a vertical position, and an upper end horizontal plate 13 is welded to the upper surface of the upper end vertical plate 12 in a horizontal position. The upper end horizontal plate 13 is joined to the lower flange 4c of the spring beam 4A by a bolt 14. In addition, in order to allow the joint position of the bolt 14 on the lower flange 4c to be shifted, the diameter of the bolt insertion hole formed in the lower flange 4c has a sufficient clearance with respect to the diameter of the bolt 14. In addition, a high-strength bolt is used as the bolt 14, and in order to compensate for the clearance of the bolt insertion hole formed in the lower flange 4c, a washer is interposed between the bolt 14 and the bolt insertion hole, and the washer is welded to the lower flange 4c.
On the other hand, the lower end of the vibration isolator 10 is joined to the tip 4a of the lower protruding beam 4A by a welded portion 16. That is, a lower end vertical plate 15 is provided at the lower end of the vibration isolator 10 and welded to the side of the vibration isolator 10 in a vertical position. This lower end vertical plate 15 is then joined by a welded portion 16 to the upper flange 6a of the joining member 6 joined to the protruding beam 4A.

In this way, when the upper end of the vibration isolator 10 is joined to the tip 4a of the sprung beam 4A by the bolt 14, the play of the bolt 14 can adequately absorb the construction error of the marion material 22 (see FIG. 2) in which the vibration isolator 10 is built. On the other hand, when the lower end of the vibration isolator 10 is joined to the tip 4a of the diagonal sprung beam 4A by the welded portion 16, the lower end of the vibration isolator 10 is firmly fixed to the tip 4a of the diagonal sprung beam 4A, and the vibration of the diagonal sprung beam 4A is appropriately suppressed. Furthermore, since the lower end of the vibration isolator 10 is joined to the lower diagonal sprung beam 4A by the welded portion 16, welding work at the welded portion 16 can be easily performed facing downward.

[Another embodiment]
Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied alone, but may also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, the vibration prevention material 10 inserted inside the marion material 22 of the protruding corner connects the diagonal spring beam 4A that springs out diagonally (spring direction A) from the corner column 2 between the upper and lower floors to prevent vibration of the diagonal spring beam 4A and the two-way spring slab 8 supported by the diagonal spring beam 4A. However, the marion material into which the vibration prevention material 10 is inserted may be a marion material that is placed between exterior materials provided on the same surface, rather than a marion material at the protruding corner, and the vibration prevention material inserted inside the marion material may connect the spring beam that springs out in one direction from the exterior column to prevent vibration of the spring beam and the spring slab that springs out in one direction supported by the spring beam.

(2) In the above embodiment, the vibration-isolating material 10 is provided inside the back mullion 24 of the mullion material 22, but the installation position of the vibration-isolating material 10 inside the mullion material 22 may be changed as appropriate.

(3) In the above embodiment, the upper end of the vibration isolating material 10 is joined to the upper spring beam 4A by a bolt 14, and the lower end of the vibration isolating material 10 is joined to the lower spring beam 4A by a weld 16. However, the method of joining the upper and lower ends of the vibration isolating material 10 to the upper and lower spring beams 4A may be changed as appropriate.

(4) In the above embodiment, the upper and lower ends of the vibration isolating material 10 are joined to the tip 4a of the protruding beam 4A, but the joining points of the upper and lower ends of the vibration isolating material 10 on the protruding beam 4A may be changed as appropriate.

(5) In the above embodiment, the vibration isolator 10 is made of solid steel, but the vibration isolator may be made of another material, such as a steel pipe.

2 Corner columns (outer columns)
4A: Cantilever beam 8: Cantilever slab 10: Vibration prevention material 14: Bolt 16: Welded part 20: Curtain wall 22: Marion material A: Cantilever direction (diagonal direction)
X First horizontal direction Y Second horizontal direction

Claims (4)

A vibration prevention structure in which a spring beam projecting outward from an outer column is connected between upper and lower floors by a vibration prevention material to prevent vibration of the spring beam and the spring slab supported by the spring beam,
A vibration prevention structure in which the vibration prevention material is inserted inside the marion material of the curtain wall located outside the exterior columns. The protruding slab is a two-way protruding slab that protrudes in a first horizontal direction and a second horizontal direction intersecting the first horizontal direction,
2. The vibration prevention structure according to claim 1, wherein the protruding beam is an oblique protruding beam protruding from a corner post in an oblique direction that is a combination of the first horizontal direction and the second horizontal direction. The vibration prevention structure according to claim 1 or 2, in which one of the upper and lower ends of the vibration prevention material is joined to the spring beam by a bolt, and the other is joined to the spring beam by welding. The vibration prevention structure according to any one of claims 1 to 3, wherein the vibration prevention material is made of solid steel.

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