JP2587927Y2 - Base-isolated floor structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a buffer plate to be bridged between a floor plate of a base isolation structure and a floor plate of a non-seismic structure.

[0002]

2. Description of the Related Art When a building is entirely seismically isolated, the seismic isolation device becomes excessively large. Therefore, only a part of the building is installed as a seismic isolation structure and important equipment is installed. Sometimes. In this case, a buffer plate is hung between the floor plate of the seismic isolation structure and the floor plate of the non-seismic structure. However, the vibration during the earthquake is different between the two structural parts. It is necessary to adopt a mounting structure that can absorb the difference between the two. Japanese Patent Application No. 3-80483 (Japanese Utility Model Application Laid-Open No. 5-32572) discloses a mounting structure for such a shock absorbing plate, in which a receiving hardware is fixed to an end of a floor plate of a seismic isolation structure. In a mounting structure in which a shock absorbing plate fixed to one end of a fixed metal fitting that engages with an upper surface of a floor plate of a non-seismic structure, the receiving metal is formed to have a shape that rises upward after protruding outward, This is a box-shaped structure in which the fixed metal fitting is inserted into the metal fitting.

[0003]

In the above-mentioned conventional mounting structure of the shock-absorbing plate, horizontal movement can be absorbed, but a box-shaped fixing metal fits into a concave-shaped receiving metal. Therefore, when the non-seismic structure moves upward, excessive stress acts on the fixing portion between the fixing hardware and the buffer plate, which may cause damage to the fixing portion. As a rough guide, the horizontal movement is aimed at a movement width of 200 to 300 mm, and the vertical movement is aimed at a movement height of 20 to 30 mm. Therefore, an object of the present invention is to provide a mounting structure of a shock absorbing plate capable of absorbing seismic motion including vertical motion.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, that is, the end of one of the floor plates of the base isolation structure and the non-base isolation structure. In a base-isolated floor structure in which a receiving metal member is fixed to a portion and a buffer plate in which a fixing metal member engaged with the receiving metal member is fixed to one end is laid over the upper surface of the other one of the floor plates, the receiving metal member is an outer member. The fixed metal fitting is formed in a shape that rises upward after projecting to the floor, and the fixing hardware has an inclined surface that is inclined downward and outward.

[0005]

[Function] While the receiving hardware stands upward after protruding outward, the fixing hardware has an inclined surface, so that the fixing hardware is fixed even when one of the other floor plates moves upward. The shock absorbing plate can be rotated without difficulty, so that no excessive stress acts on the fixing portion between the fixing hardware and the shock absorbing plate. Further, when the seismic motion stops, the fixed hardware and the buffer plate to which the fixed hardware is attached slide down along the inclined surface of the fixed hardware, and thus return to the original shape naturally.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a wall 2 on a floor slab 1 of a building
In this case, the border floor plate 4 is fixed via the non-seismic isolation support legs 3. On the other hand, on the floor slab 1 of the building, a seismic isolation part structural member 5 is provided via a seismic isolation device (not shown), and on the seismic isolation part structural member 5 via seismic isolation support legs 6. The seismic isolation floor plate 7 is fixed. This seismic isolation floor plate 7
An electronic computer and other important devices (not shown) are placed on the top. A metal fitting 8 is fixed to the outermost one of the seismic isolation part supporting legs 6, and a fixed metal piece 9 is engaged with the metal fitting 8. The fixing hardware 9 is fixed to the buffer plate 10, and the tip (the left end in the drawing; the same applies hereinafter) of the buffer plate 10 is stretched over the upper surface of the border floor plate 4.

As shown in FIG. 2, the receiving metal member 8 includes an inner plate portion 8a, a bottom plate portion 8b, an outer plate portion 8c, and an upper plate portion 8d.
Are bent at right angles in that order, and are formed by extrusion of an aluminum alloy. The upper end surface of the inner plate portion 8a is formed flush with the upper surface of the seismic isolation unit floor plate 7,
The bottom plate portion 8b is screwed to the seismic isolation portion supporting leg 6, and the height of the outer plate portion 8c is lower than the height of the inner plate portion 8a.
The width of the upper plate 8d is smaller than the width of the bottom plate 8b, and therefore, a gap is formed between the end face of the upper plate 8d and the inner plate 8a to insert the fixing hardware 9. The fixed hardware 9
The upper plate portion 9a, the inclined portion 9b, the vertical portion 9c, and the lower plate portion 9d are bent in this order, and are formed by extrusion of an aluminum alloy. At the boundary between the upper plate 9a and the inclined portion 9b, there is formed a vertical surface 9e with which the inner end of the upper plate 8d of the receiving metal comes into contact, and is screwed to the buffer plate 10 at the upper plate 9a. I have. The upper surface of the shock absorbing plate 10 is formed flush with the upper surface of the base isolation floor plate 7, and the lower surface thereof is flush with the upper surface of the border floor plate 4.

This embodiment is configured as described above.
Regarding the movement of the shock absorbing plate 10 to the seismic isolation unit floor plate 7 side in the normal state without an earthquake, the end surface of the shock absorbing plate 10 comes into contact with the inner plate portion 8a of the receiving metal member 8, and the side of the shock absorbing plate 10 near the border part floor plate 4 As the vertical surface 9e of the fixed hardware comes into contact with the upper plate portion 8d of the receiving hardware, the buffer plate 10 does not rattle in the left-right direction. Also, since there is an adjacent buffer plate in the front-back direction, there is no backlash in the front-back direction.

When an earthquake motion occurs, the seismic isolation floor plate 7
And the border floorboard 4 make a different movement. First, when the border floor plate 4 moves horizontally, that is, moves back and forth or left and right, only the lower surface of the buffer plate 10 and the upper surface of the border floor plate 4 slide, and no particular problem occurs. Next, during the vertical movement, when the border floor plate 4 descends, as shown in FIG. 3, the buffer plate 10 slightly rotates counterclockwise while its tip abuts on the upper surface of the border floor plate 4, and thus the buffer plate 10 10 can follow the descending of the floor board 4 without difficulty. In this state, even if horizontal motion is further applied, only the tip of the buffer plate 10 and the upper surface of the border floor plate 4 slide, and the vehicle can still follow the seismic motion.

On the other hand, when the border floor plate 4 rises during the vertical movement, the following occurs. That is, if the center of gravity G between the buffer plate 10 and the fixing hardware is located on the left side of the drawing with respect to the front end (the right end in the drawing; the same applies hereinafter) of the border floor plate 4, the whole of the buffer plate 10 is simply formed by the border floor plate 4. When lifted, that is, the buffer plate 10 follows the movement of the border floor plate 4. Even if horizontal motion is further applied in this state, the shock absorbing plate 10 only moves horizontally while being lifted by the border floor plate 4, and can still follow the seismic motion.

However, in this embodiment, since the center of gravity G between the buffer plate 10 and the fixing hardware is located on the right side of the drawing in relation to the tip of the border floor plate 4, as shown in FIG. The buffer plate 10 is slightly rotated clockwise while being in contact with the lower surface of the base plate, so that the buffer plate 10 follows the rise of the border floor plate 4 without difficulty. Even if the forward and backward movements are further weighted in this state, no particular change occurs. On the other hand, when the left-right motion is weighted, the rotation angle of the buffer plate 10 changes and still follows the seismic motion. When the front end of the border floor plate 4 moves to the right side of the drawing beyond the center of gravity G between the buffer plate 10 and the fixing hardware as shown in FIG. If there is no friction with the hardware 8, the buffer plate 10 falls down at once and falls on the border floor plate 4, but actually, due to the above-mentioned friction, the buffer plate 10
Further increases the rotation angle. After that, the movement of the border floor plate 4 to the right stops and changes to the movement to the left,
As shown in FIG. 6, the buffer plate 10 falls down at once and falls on the border floor plate 4.

As described above, the buffer plate 10 follows the movement of the border floor plate 4 no matter how the seismic motion works. When the seismic motion finally stops, since the lower surface of the inclined portion 9b of the fixture is an inclined surface 9f, the buffer plate 10 to which the fixing hardware 9 is attached slides down along the inclined surface 9f. It returns to its original shape naturally.

The inner plate portion 8a of the receiving metal member and the vertical portion 9c of the fixing metal member may not be particularly provided. In addition, the shape of the surface of the fixed metal member on the side opposite to the inclined surface 9f of the inclined portion 9b is not particularly problematic. Further, a configuration in which the vertical surface 9e of the fixing hardware is not provided can be adopted.
It is preferable to provide this in order to improve the dimensional accuracy in the lateral direction of the above, and to ensure metal touch between the upper surface of the upper plate portion 8d of the receiving hardware and the lower surface of the upper plate portion 9a of the fixed hardware. The upper plate portion 8d of the receiving hardware and the lower plate portion 9d of the fixed hardware can be configured not to be provided. However, assuming a situation such as the bounce of the buffer plate 10, the upper plate portion 8d and the fixed hardware are provided. It is preferable to make it difficult for the metal 9 to fall off from the metal fitting 8. When the upper plate 8d is not provided,
The vertical surface 9e of the fixing metal comes into contact with the inner end of the outer plate 8d of the receiving metal.

Further, in the present embodiment, the case where the receiving hardware 8 is attached to the seismic isolation structure side and the buffer plate 10 is extended over the non-seismic isolation structure side is shown. The shock absorbing plate 10 can be mounted on the side of the base isolation structure. In the present embodiment, each floor plate 4, 7 is connected to each support leg 3,
6 shows the case of the free access floor supported by
The present invention can be applied to floors other than the free access floor. Further, although only one buffer plate 10 is shown, it is also possible to bend such that, for example, a hinge that bends only downward, so that one of the buffer plates does not go up (dotted line in FIG. 5). .

[0015]

[Effects of the Invention] According to the present invention, while the receiving hardware stands up after protruding outward, the fixed hardware has an inclined surface, so that the buffer plate to which the fixed hardware is fixed can rotate without difficulty. Therefore, no excessive stress acts on the fixing portion between the fixing hardware and the buffer plate. Further, when the seismic motion stops, the fixed hardware and the buffer plate to which the fixed hardware is attached slide down along the inclined surface of the fixed hardware, and thus return to the original shape naturally.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional view of a main part.

FIG. 3 is a longitudinal sectional view showing a case where a non-seismic structure is lowered.

FIG. 4 is a longitudinal sectional view showing a case where the non-seismic structure is raised.

FIG. 5 is a vertical cross-sectional view showing a state in which the non-seismic isolation structure is elevated and then approaches the seismic isolation structure.

FIG. 6 is a longitudinal cross-sectional view showing a case where the non-seismic structure rises, approaches the seismic isolation structure, and is separated from the seismic isolation structure.

[Explanation of symbols]

1 ... floor slab 1 2 ... wall 3
… Non-seismic support leg 4… floor board 5… seismic isolation structural member 6
... seismic isolation support legs 7 ... seismic isolation floor plate 8 ... receiving hardware 8
a: inner plate 8b: bottom plate 8c: outer plate 8
d: Upper plate 9: Fixing hardware 9a: Upper plate 9
b: inclined portion 9c: vertical portion 9d: lower plate portion 9
e: vertical surface 9f: inclined surface 10: buffer plate G
… Center of gravity

Continuation of the front page (72) Inventor Koichi Fukaya 4-1-1-13 Toyo, Koto-ku, Tokyo Within Hitachi Koki Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) E04F 15/18 601 E04F 15 / 024 605

Claims (3)

(57) [Scope of request for utility model registration] 1. A receiving hardware is fixed to an end of one of a floor plate of a seismic isolation structure portion and a floor plate of a non-seismic isolating structure portion, and a fixing metal fitting with the receiving metal member is fixed to one end. In the base-isolated floor structure in which the buffer plate is stretched over the upper surface of the other one of the floor plates, the receiving metal member is formed to have a shape that protrudes outward and then rises upward, and the fixed metal member extends downward. A base-isolated floor structure characterized by having a slope that slopes toward the bottom. 2. The receiving metal member is formed to have a shape that returns to the inside after rising upward, and the fixed metal member directly returns to the inside or extends downward after forming the inclined surface. The seismic isolation floor structure according to claim 1, wherein the floor is formed to have a shape that returns inward after performing. 3. A vertical surface is formed at the base of the inclined surface of the fixed hardware, the vertical surface being in contact with the inner surface of the end rising above the receiving metal, or the inner surface of the end returning inward. The base-isolated floor structure according to claim 1 or 2.