JPH10159191A - Base isolation floor slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a floor slab from being detached from a structure by the vibration, etc., and dropped by providing a projected part in a center of the floor slab which is loaded across an upper surface of the structure and closes the clearance, and connecting the projected part to the structure by an expansion body. SOLUTION: A floor slab body 1 is loaded across upper surfaces 2a, 3a of structures 2, 3. A rod-shaped part is provided in the center of a lower side of the floor slab body 1. Wall sides of the structures 2, 3 is connected to the projected part 6 by coil springs 12, 13 through wall connection parts 10, 11 and floor slab connection parts 7, 7. The projected part 6 is located at the center of the clearance 5 by the repulsive force of the coil springs 12, 13. When the structures 2, 3 are displaced by the vibration, etc., the coil springs are expanded/contracted, and through the repulsion, the projected part 6 is kept at the center of the clearance 5. In the floor slab body 1 to which the projected part 6 is fixed, each edge side is not detached from the upper surfaces 2a, 3a of the structures 2, 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor slab for closing a gap between adjacent structures, and more particularly to a floor slab which vibrates in any of up, down, front, rear, right and left directions due to an earthquake or the like. The present invention relates to a seismic isolation slab that can immediately follow the vibration of a structure and maintain a closed state of the gap.

[0002]

2. Description of the Related Art As a conventional seismic isolation slab, for example, a bridge slab is provided with a substantially comb-shaped joint at a joint between the slabs in order to close a gap between the slabs. Even when the unevenness of the joint is brought close to each other and meshed with each other, even if displacement such as expansion and contraction and shaking of the floor slab occurs, the gap is kept closed. Such a seismic isolation slab has a simple structure, and when displacement occurs in the longitudinal direction of the bridge, there is an advantage that the joints can come and go with each other to close the gap, When the displacement occurs, there is a serious disadvantage that the gap cannot be closed due to the disengagement of the unevenness and the like.

[0003] A seismic isolation floor slab having a structure described in Japanese Utility Model Publication No. 2-47685 is also known. The outline thereof will be described with reference to FIG. 7. A floor slab main body 22 (cover plate) for closing a gap between adjacent structures 21, 21 at a predetermined interval, and a wall direction along the gap between the structures 21, 21. A holding portion 23, 23 having a substantially U-shaped cross section opened and fixed to, and a rod-shaped support member 25 rotatably connected to a bolt 24 supported on a substantially central portion of the lower surface of the floor slab main body 22. And rollers 26, 26 provided at both ends of the support member 25 are provided with holding portions 23, 2
3 is slidably fitted.

[0004] The seismic isolation floor slab having such a configuration is used for the structure 2
When the gap is expanded and contracted due to the displacement of the bolts 21 and 21, the roller 26 of the support member 25 is rotated around the bolt 24 by sliding in the holding portion 23, and the bolt 24 is always kept in the gap. , That is, by positioning the cover plate 22 at the center of the gap to prevent the cover plate 22 from coming off (indicated by a two-dot chain line in FIG. 3).

[0005]

However, in the seismic isolation slab having the structure described in the above publication, the support member 25 is pushed and pulled by the displacement of the structure 21, and the roller 26 of the support member 25 is moved into the holding portion 23. Since it is configured to slide while abutting, if the frictional resistance between the roller 26 and the holding portion 23 is increased, the sliding is not smoothly performed. That is, the wall surface of the structure 21 and the support member
When the angle between the roller 26 and the holder 25 increases, the frictional resistance during sliding increases.
There is a problem that it becomes difficult to slide smoothly due to accumulation of dust in the inside or deformation of the holding portion 23 disposed in the longitudinal direction and meandering.

Further, since the rod-shaped support member 25 is fitted to the holding portion 23, for example, when the structure 21 repeatedly moves in the front, rear, left, and right directions in a short time due to an earthquake, the displacement is not affected. The support member 25 comes off the holding portion 23 without being able to follow,
Therefore, there is a problem that the floor slab main body 22 may fall into the gap between the structures 21, 21. Further, when the vertical displacement is added to the longitudinal and lateral displacements of the structure 21, the holding portions 23 fixed to the wall surfaces of the adjacent structures 21 and 21 are vertically displaced. The connecting portion of the support member 25 and the holding portion 23 are extremely easily damaged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and closes a gap between structures even if the structure vibrates in any of up, down, front, rear, right and left directions due to an earthquake or the like. An object of the present invention is to provide a seismic isolated floor slab having a simple structure capable of maintaining a state.

[0008]

Means for Solving the Problems The present invention has been made to solve the above problems, and the means for solving the problems extends over the upper surfaces 2a, 3a of the structures 2, 3. A floor slab body 1 capable of closing the gap 5 between the structures 2 and 3 by being placed; a projection 6 provided in the floor slab main body 1 and projecting into the gap 5; , And at least one pair of elastic bodies 12 and 13 connected to the wall surfaces of the structures 2 and 3 respectively at the other end.

The base-isolated floor slab having the above structure is used for the structures 2, 3
The pair of elastic bodies 12 and 13 connected to the wall surfaces of the floor slab are connected to the protruding portions 6 of the floor slab body 1 respectively. Will be located. That is, when the structures 2 and 3 are displaced, the elastic members 12 and 13 expand and contract and repel each other, so that the protrusion 6 is maintained at a substantially central position of the gap 5. 6 is fixed to the upper surfaces 2a, 3 of the structures 2, 3.
It does not deviate from a.

As described above, by using the telescopic members 12 and 13 as means for positioning the projecting portion 6 substantially at the center of the gap 5,
When the structures 2 and 3 are displaced in any direction of up, down, front, back, and left and right, the elastic members 12 and 13 expand and contract and absorb flexibly, and the protrusions 6
Will be maintained at substantially the center position of. For example, even if the structures 2 and 3 are repeatedly displaced up, down, back and forth, and left and right in a short time due to an earthquake, the elastic bodies 12 and 13 connected to the wall expand and contract according to the displacement. It is extremely unlikely that the floor slab will fall into the gap due to the support member coming off the holding part like a floor slab or the support member or the holding part being damaged, and even if an earthquake occurs, the structure 2 , 3 gap 5
Can be kept closed.

Further, if coil springs are used as the elastic members 12 and 13, for example, an inexpensive and simple seismic isolation slab can be constructed.

Further, in the means according to the third aspect, one end of each of the elastic members 12 and 13 is rotatably connected to the projection 6 and the other end is rotatably connected to the wall surfaces of the structures 2 and 3, respectively. It is to be connected. According to such means, the elastic members 12, 13 which expand and contract in accordance with the displacement of the structures 2, 3 are such that both ends of the elastic members 12, 13 are protruded even if the structures 2, 3 are displaced in any direction.
6 and the wall of structures 2 and 3
12,13 expand and contract linearly without being bent at the connection part.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a seismic isolation slab according to the present invention will be described below with reference to the drawings. FIG.
In FIG. 2 and FIG. 2, reference numeral 1 denotes a long plate-like slab which is placed on both upper sides 2a and 3a of the structures 2 and 3 so as to close the gap 5 between the structures 2 and 3. Shows the main body, and the width of the floor slab main body 1 is
It is formed wider than the width of the gap 5 between the structures 2 and 3, and
1 has a load-bearing capacity that does not break even when a truck or the like rides.

Reference numeral 6 denotes a rod-shaped protrusion supported by a predetermined distance from a substantially central portion of the lower surface of the floor slab main body 1 (in the figure,
(Abbreviated to show only one place.)

Reference numerals 7 and 7 denote floor slab connecting portions provided below the projecting portion 6 and rotatable in the horizontal direction about the axis of the projecting portion 6 (the direction of rotation is indicated by an arrow A in FIG. 1). Represent). 8,8
Indicates a pair of mounting bases respectively fixed on the wall surface of the structure 2 at substantially the same interval as the width of the gap 5, and
A pair of mounting stands 9, 9 are also fixed to the wall 3. 10,1
Reference numeral 1 denotes a wall connecting portion rotatably supported on the mounting tables 8 and 9 in a horizontal direction (the rotation direction is indicated by an arrow B in FIG. 1). In addition, as shown in FIG. 2, the floor slab connecting portion 7 is provided slightly below the wall surface connecting portion 10.

The end portions 12a, 13a of the floor slab connecting portions 7
And the other end 12b, 13b is a pair of opposing telescopic coil springs connected to the wall connecting portions 10, 11, and each of the coil springs 12, 13 has a uniform repulsive force. Furthermore, the pair of coil springs 12 and 13 facing each other
As shown in FIG. 1, each of the coil springs 12 and 13 has a substantially X-shape with the protrusion 6 as the center.

An auxiliary receiving member 14 has a substantially L-shaped side surface 14a whose one surface 14a is fixed to the upper end of the wall surface of the structures 2, 3 and whose other surface 14b is flush with the upper surfaces of the structures 2, 3. Shows the material.

The base-isolated floor slab having the above structure is used for the structures 2, 3
The pair of coil springs 12 and 13 connected to the wall of
Of the coil springs 12, 1
The projecting portion 6 is located at the center of the gap 5 due to the mutual repulsion of 3. When the structures 2 and 3 are displaced, the coil springs 12 and 13 expand and contract and repel each other, so that the protrusion 6 is maintained at the center position of the gap 5. Therefore, the protrusion
The floor slab body 1 to which 6 is fixed has two
It does not come off from the upper surfaces 2a, 3a.

Specifically, as shown in FIG. 3A, when the structure 3 is displaced backward (in the direction of arrow C) and the gap 5 is widened, the structure 3 is connected to the wall surface of the structure 3. The coil spring 13 (for convenience, the first coil spring 13) is pulled and expanded, and at the same time, the coil spring 12 (for convenience, the second coil spring 12) connected to the wall surface of the structure 2 extends and protrudes. Since the portion 6 is pulled toward the structure 2, the tension force of the opposing springs 12, 13 is balanced, and the protrusion 6
It will be located at the center of the gap 5.

Conversely, when the structure 3 is displaced in the forward direction (the direction of arrow D) and the gap 5 is narrowed, the first coil spring 13 contracts as shown in FIG. The two-coil spring 12 also draws the protruding portion 6 while contracting and positions it at the center of the gap 5.

Further, as shown in FIG.
Is displaced in the left-right direction (direction of arrow E), one 13 'of the first coil spring 13 expands, and at the same time, one 12' of the second coil spring 12 opposing it expands. At the same time as the other 13 "of the 13 contracts, the other 12" of the second coil spring 12 opposing it also contracts, and the tensile force of the two opposing springs 12, 13 is balanced, so that the protrusion 6 is located at the center of the gap 5. Will be located. In addition, structure 3
Is displaced, the protruding portion 6 is positioned at the center of the gap 5 by the two springs 12 and 13 which are similarly opposed to each other.

Further, even when the structure 3 is displaced in the vertical direction, the floor slab main body 1 does not fall off from the structures 2 and 3 by the two springs 12 and 13 which are also opposed to each other being extended and pulled. .

By the way, the floor slab connecting portion 7 and the wall surface connecting portion 1
Since 0 and 11 are provided rotatably in the horizontal direction,
Coil springs 12 and 13 that expand and contract according to the displacement of structures 2 and 3
The advantage is that the coil springs 12, 13 can be extended and contracted linearly without bending at the connecting portions connected to the floor slab connecting portion 7 and the wall connecting portions 10, 11, and therefore the coil spring 12 is hardly damaged. There is.

If the configuration is such that the projecting portion 6 is maintained at the center position of the gap 5 by utilizing the mutual repulsion of the opposing coil springs 12 and 13 to prevent the floor slab main body 1 from falling off, the structure
Even if 2, 3 is displaced in any direction of up, down, front, back, and left, both springs 1
2, 13 can instantaneously follow and expand and contract to maintain the protrusion 6 at the center position of the gap 5, and are not affected by frictional resistance unlike the conventional seismic isolation slab.

Further, for example, the structures 2, 3
Even if displacement occurs repeatedly in the front, rear, left and right directions within a short time, both springs connected to the wall expand and contract and flexibly absorb the displacement, so it is supported like a conventional seismic isolation slab It is extremely unlikely that the floor slab will fall into the gap due to the member coming off the holding part or the support member or the holding part being damaged, and even if an earthquake occurs, the gap 5 between the structures 2 and 3 should be securely removed. It can be kept closed.

The structure of the seismic isolation floor slab according to the present invention connects the coil springs 12 and 13 facing the floor slab main body 1 and connects the coil springs 12 and 13 to the wall surfaces of the structures 2 and 3. Since the structure is simple, the construction is easy and the material cost is low.

In the above embodiment, two sets of opposed coil springs 12, 13 are connected to the projecting portion 6 of the floor slab main body 1, but the present invention is not necessarily limited to such a configuration.
For example, as shown in FIG. 4, a configuration in which a pair of coil springs 12 and 13 facing the protrusion 6 are connected to each other may be used.

In the above embodiment, the floor slab main body 1
The protruding portion 6 fixed to the floor has a rod shape, but the protruding portion 6 is not necessarily limited to a bar shape. For example, as shown in FIG. When such a plate-shaped protrusion 6 is fixed, a pair of coil springs 12 and 13 facing each other may be connected to both ends 6b and 6b of the protrusion 6, respectively.

Further, in the above embodiment, the elastic body 1
Although coil springs are used for 2,13, the elastic members 12,13 are not necessarily limited to coil springs.For example, rubber having excellent weather resistance may be used, and hydraulic cylinders and air cylinders may be used. It may be used as the elastic members 12 and 13. Also,
You may use the elastic bodies 12 and 13 which can adjust the repulsion force of a coil spring by combining a coil spring with a hydraulic cylinder. The point is that the projecting portion 6 of the floor slab main body 1 can always be urged toward the center from the wall surfaces of the two structures 2 and 3 or it can be always pulled in the direction of the wall surface of the two structures 2 and 3. However, the present invention is not limited to the coil spring as in the above embodiment.

In the above embodiment, the structures 2, 3
In this case, the auxiliary receiving member 14 is fixed, but the auxiliary receiving member 14 does not necessarily have to be fixed to the structures 2 and 3. However, by fixing the auxiliary receiving member 14, even when the structures 2, 3 are displaced and approach each other and the gap 5 becomes extremely narrow as shown in FIG. The elastic bodies 12, 13 are structures
It has the advantage of not being crushed between a few walls.

[0031]

As described above, the seismic isolation floor slab according to the present invention has a simple structure, and even if the structure is displaced in any direction of up, down, front, back, left and right, the projecting portion is quickly moved to the structure. Since it can be positioned substantially at the center of the gap, the floor slab main body can be prevented from coming off the structure and falling off.

That is, since the position of the protruding portion is maintained by utilizing the mutual repulsion of the pair of elastic members, unlike the conventional seismic isolation floor slab, it is not affected by the frictional resistance and furthermore. In the structure, the structural members such as the support member of the seismic isolation slab are not damaged by the displacement of the structure. Therefore, the floor slab main body continues to close the gap in a state of straddling the upper surface thereof irrespective of the displacement of the structure, and the number of regular maintenance can be reduced as compared with the related art.

Further, the seismic isolation slab according to the present invention is such that the elastic body expands and contracts even when the structure is incompatible with the conventional structure, for example, in small and vertical repetitions of the structure caused by an earthquake. The floor slab body does not fall off because it is absorbed,
It has a particularly remarkable effect on earthquake countermeasures.

Further, if a coil spring is used as the elastic body as described in claim 2, an inexpensive and simple structure of a seismic isolation slab can be formed. If both ends of the elastic member are rotatably connected, the elastic member expands and contracts linearly without being bent at the connecting portion, so that the elastic member is less likely to be damaged.

[Brief description of the drawings]

FIG. 1 is a partially omitted plan view showing an embodiment of a base-isolated floor slab according to the present invention.

FIG. 2 is a sectional side view taken along line XX of FIG. 1;

FIGS. 3A, 3B, and 3C are partially omitted plan views showing the state of the seismic isolation floor slab when the structure is displaced back and forth and left and right.

FIG. 4 is a partially omitted plan view showing another embodiment of the base-isolated floor slab according to the present invention.

FIG. 5 is a partially omitted plan view showing another embodiment of the base-isolated floor slab according to the present invention.

FIG. 6 is a cross-sectional side view showing the state of the base-isolated floor slab when the structure is displaced and the gap is narrowed.

FIG. 7 is a partially omitted schematic plan view showing a conventional base-isolated floor slab.

[Explanation of symbols]

1 ... floor slab body, 2, 3 ... structure, 2a, 3a ... top surface, 5 ... gap, 6 ... projecting part, 12, 13 ... elastic body

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tokatsu Yoshikawa 4-6-2 Komyobashi, Chuo-ku, Osaka City, Osaka Prefecture Nikken Sekkei Co., Ltd.

Claims (3)

[Claims] 1. A gap (5) between the structures (2) and (3) by being placed over the upper surfaces (2a) and (3a) of the structures (2) and (3).
A floor slab body (1) that can be closed, a protrusion (6) provided on the floor slab body (1), and protruding into the gap (5), and one end connected to the protrusion (6). And the other end is a structure (2),
(3) At least one pair of elastic bodies (1
2), (13) A base-isolated floor slab characterized by the following. 2. The base isolation slab according to claim 1, wherein said elastic bodies (12), (13) are coil springs. 3. One end of each of the elastic members (12), (13) has a projecting portion.
(6), and the other end is connected to the structure (2),
3. The floor slab according to claim 1, wherein said slab is rotatably connected to the wall of (3).