JP3360930B2 - Floor seismic isolation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor seismic isolation device for preventing a floor of a room from shaking when an earthquake occurs. 2. Description of the Related Art Conventionally, as this type of floor seismic isolation device, there is one shown in FIG. This floor seismic isolation device includes an oil damper 51 and two coil springs 52 and 53. The oil damper 51 is provided at the end 5 of the cylinder 55.
5 a is pivotally attached to a bracket 56, which is fixed to a frame 58. The frame 58 is
One end 58 a is pivotally attached to a rotating shaft 60, which is fixed to a slab floor 61. A free bearing 62 is fixed to the other end 58b of the frame 58, and the free bearing 62 is a slab floor 61.
The other end 58b of the frame 58 is supported on the upper side. The free bearing 62 can freely travel on the slab floor 61. The tip 63a of the slide rod 63 of the oil damper 51 is fixed to a connecting plate 64. The connecting plate 64 is a fixing plate 6 fixed to the seismic isolation floor 65.
6 is connected by a wire 67. The connecting plate 64 has two rods 68, 6
9 are fixed, and the rods 68, 69
8 penetrates a wall 58c fixed to the other end 58b. Further, the rods 68 and 69 extend along the frame 58 and penetrate a wall 58d fixed to one end 58a of the frame 58. The two rods 68, 69
Can slide with respect to the frame 58. Then, the two coil springs 52, 53
Are mounted on the two rods 68, 69 inside the frame 58, and have spring ends 70 and 7 on both ends.
1, 72 and 73 are fixed. One of the spring ends 71, 73 is fixed to the wall 58d of the frame 58, and the other spring end 70, 72 is located at a position close to the other end 58b of the frame 58.
It is fixed to 69. [0005] The floor seismic isolation device having the above-described structure is used for the seismic isolation floor 65.
When the slab floor 61 slides so that the fixed plate 66 fixed to the slab floor 61 and the rotating shaft 60 fixed to the slab floor 61 are separated from each other, the cylinder 5 is integrated with the slab floor 61.
5 slides, and the slide rod 63 is extended with respect to the cylinder 55. At the same time, the spring ends 71 and 73 fixed to the wall 58d of the frame 58 are slid to one side with respect to the rods 68 and 69 to extend the coil springs 52 and 53. That is, when the slab floor 61 slides, the vibration of the slab floor 61 is absorbed by the oil damper 51 to suppress the vibration of the seismic isolation floor 65, and the coil springs 52 and 53 accumulate a restoring force. Thereafter, the oil damper 51 is restored with the restoring force.
Is returned to the predetermined neutral position. On the other hand, the fixed plate 6 fixed to the seismic isolation floor 65
When the slab floor 61 slides so that the rotating shaft 60 fixed to the slab floor 61 approaches, the wire 67 only loosens and does not absorb the swing of the slab floor 61. [0007] As described above, the floor seismic isolation device operates when the slab floor 61 slides so that the fixed plate 66 fixed to the seismic isolation floor 65 and the rotating shaft 60 fixed to the slab floor 61 are separated from each other. Only when the slab floor 61 slides so that the fixed plate 66 and the rotating shaft 60 approach each other. Therefore, there is a problem that the floor seismic isolation device operates only when the slab floor 61 slides in one direction. Therefore, the above-mentioned conventional floor seismic isolation devices are arranged in pairs in opposite directions as shown in sections A and B of the plane of the device mounting portion of the room where the floor seismic isolation device shown in FIG. It can be operated in both directions. Further, in the floor seismic isolation device, when a prestress force is applied to the coil springs 52 and 53 at the neutral position, the prestress force cannot be set to a desired value when the device is assembled. There are drawbacks. That is, the prestressing force must be set when the device is attached to the slab floor 61 and the seismic isolation floor 65. The setting of the prestress is performed by adjusting the wire length or the mounting position to the slab floor, but there is a problem that the adjustment work is very troublesome. SUMMARY OF THE INVENTION It is an object of the present invention to provide a floor seismic isolation device which can be operated in both directions, and can be used for initial setting of a restoring force of a spring at the time of assembling, and can be easily mounted. In order to achieve the above object, a floor seismic isolation device according to the present invention comprises a substantially rectangular outer frame, and an inner frame guided reciprocally by the outer frame. An oil damper disposed inside the outer frame and coupling the outer frame and the inner frame; a spring disposed in the inner frame and capable of expanding and contracting in a reciprocating direction of the inner frame; Connected, extends in the reciprocating direction of the inner frame, and the other end is fixed to one end of the outer frame through one end of the inner frame in the reciprocating direction. A first rod body that is flexible between one end of the outer frame and one end connected to the other end of the spring, and extends in the reciprocating direction of the inner frame and the other end of the inner frame; The other end of the inner frame is fixed to the other end of the outer frame through the other end of the reciprocating direction. A second rod having a flexible portion between the end and a first rod fixed to the first rod so as to contact the outer surface of the inner frame to urge the inner frame to a neutral position; An engaging member, and a second engaging member fixed to the second rod so as to contact the outer surface of the inner frame and urge the inner frame to a neutral position. One of the frames is rotatably fixed to the slab floor and the other to the seismic isolation floor. It is now assumed that the outer frame is fixed to the seismic isolation floor and the inner frame is fixed to the slab floor. Then, when an earthquake occurs and the slab floor slides to one side with respect to the seismic isolation floor, the inner frame slides to one side with respect to the outer frame. Then, the oil damper expands or contracts, thereby suppressing the vibration force (moving force) of the slab floor from acting on the seismic isolation floor. That is, the vibration energy of the slab floor is absorbed by the oil damper. At the same time, a first engaging member fixed outside the inner frame to a first rod connected to one end of the spring engages the inner frame and the first frame and the first frame. Slide to one side with the rod. At this time, the second engagement member fixed outside the inner frame to the second rod connected to the other end of the spring is separated from the inner frame without sliding with respect to the outer frame. Accordingly, the spring extends by an amount corresponding to the sliding of the inner frame in one direction, and stores a force for restoring the inner frame to a predetermined neutral position. When the sliding of the inner frame in one direction is completed, the spring restores the inner frame to a predetermined neutral position while resisting the viscosity of the oil damper. When the slab floor slides on the other side with respect to the seismic isolation floor, the inner frame slides on the other side with respect to the outer frame. Then, the oil damper contracts or expands to prevent the movement of the slab floor from being transmitted to the seismic isolation floor. At the same time, an engaging member fixed outside the inner frame to a second rod connected to the other end of the spring engages the inner frame and the second rod and the second rod. Slide to the other with. At this time, the first engaging member fixed outside the inner frame to the first rod connected to one end of the spring is separated from the inner frame without sliding with respect to the outer frame. Therefore, the spring extends by the amount that the inner frame slides in the other direction,
The force for restoring the inner frame to a predetermined neutral position is stored. When the sliding of the inner frame in the other direction is completed, the spring restores the inner frame to a predetermined neutral position while resisting the viscosity of the oil damper. As described above, according to the present invention, the movable floor
When the slab floor moves in both directions with respect to the (seismically isolated floor), the oil damper operates to prevent the movement from being transmitted to the movable floor. Further, the spring extends for both directions of movement of the slab floor relative to the movable floor,
The force for restoring the inner frame to the predetermined neutral position is stored, and the inner frame can be returned to the predetermined neutral position. Further, according to the present invention, since both ends of the spring are connected to the outer frame via the rod and the flexible member, the initial tension of the spring can be set at the time of assembly. Therefore, unlike the conventional example, there is no need to set the initial tension of the spring at the time of attachment to the floor, so that the work of attaching to the floor is simplified. That is, according to the present invention, there is provided a floor seismic isolation device which can be operated in both directions, can set a restoring force at the time of assembly, and can be easily attached to a floor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 shows an embodiment of the floor seismic isolation device of the present invention viewed from above. In this embodiment, a substantially rectangular outer frame 1, a substantially rectangular inner frame 2 slidably arranged inside the outer frame 1, and two springs 3 arranged inside the inner frame 2 are described. , 5. In the above embodiment, the oil damper 6 is provided. This oil damper 6
The other end 7b of the cylinder 7 is connected to the other end 2a of the inner frame 2.
Fixed to. As shown in FIG. 2A, one end 7a of the cylinder 7 of the oil damper 6 is fixed by abutting a spacer 38.
Numeral 8 is attached to a shaft 8a fixed to the slab floor 8 so as to be rotatable in the horizontal direction. The oil damper 6
Slide rod 10 slidably penetrates the other end 2 a of the inner frame 2, and the tip 10 a thereof is connected to the other end 1 of the outer frame 1.
a. The outer frame 1 has a pivot portion 1 a-1 at the other end 1 a pivotally attached to a joist 9 of a seismic isolation floor 71. Roller bearings 37, 37 are attached to both sides of the other end 2a of the inner frame 2, and the other end 2a of the inner frame 2 is fixed to the slab floor 8 by the roller bearings 37.
Support for As shown in FIG. 1 and FIG.
Both ends 3a and 3b, 5a and 5b of book springs 3 and 5
Are connected to rigid rods 11, 12, 13, and 14, respectively, and the rods 11, 12, 13, 14 penetrate the ends 2a, 2b of the inner frame 2. The rods 11 and 13 are slidable with respect to the end 2a of the inner frame 2, and the rods 12 and 14 are slidable with respect to the end 2b of the inner frame 2. I have. The rods 11 and 13 are second rods, and the rods 12 and 14 are first rods. The rods 11, 12, 13, 14 are provided with engaging members 15, 16, 1, 1 located outside the inner frame 2.
7, 18 are fixed. Further, the rods 11, 1
Wires 20, 21, 22, and 23 are connected to ends 11a, 12a, 13a, and 14a of the 2, 13, and 14, respectively.
Reference numerals 21, 22, and 23 are connected to ends 1a and 1b of the outer frame 1, respectively. The engagement members 15 and 17 are second engagement members,
The engaging members 16 and 18 are the first engaging members. The wires 20 and 22 are the second flexible members, and the wires 21 and 23
Is a first flexible member. As shown in FIGS. 1 and 3, the inner frame 2
Each of the side plates 25 and 26 has two rollers 27
, 28, 29 and 30 are fixed by a washer 31 and a nut 32. The rollers 27, 28, 29, 30 can travel along guide portions 33, 34 having a U-shaped cross section on both sides of the outer frame 1. Guide part 33,3
Reference numeral 4 has two pads 35 and 36 facing each other with the rollers 27 to 30 therebetween. Next, FIG. 4 shows the internal structure of the oil damper 6. The oil damper 6 is mounted on the cylinder 7
Piston 42 sliding inside cylinder chamber 41 of
The piston 42 is fixed to the end 10 b of the slide rod 10. The cylinder 7 is
Oil passage 43 also serving as an oil sump surrounding the cylinder chamber 41
have. The oil passage 43 is provided in the cylinder chamber 41.
A cylindrical first oil passage 45 located radially outward of
It has a disc-shaped second oil passage 47 which is separated from the first oil passage 45 by the constricted portion 46. The first oil passage 45
A first check valve 48 that allows oil to flow only from the cylinder chamber 41 to the first oil passage 45 between the first check valve 48 and the cylinder chamber 41
Is provided. Further, between the cylinder chamber 41 and the second oil passage 47, a second check valve 50 that allows oil to flow only in the direction from the second oil passage 47 to the cylinder chamber 41 is provided. The two chambers 41 formed by the piston 42 partitioning the cylinder chamber 41
a and 41b, the chamber 4 communicating with the second check valve 50
The piston 42 is provided with third check valves 51 and 51 for passing oil only in a direction from 1b to the chamber 41a communicating with the first check valve 48. When the oil damper 6 is contracted, the piston 42 slides toward the second oil passage 47 and the third check valve 51 opens to open the chamber 41 of the cylinder chamber 41.
The oil in b moves through the third check valve 51 to the chamber 41a. Then, the first check valve 48 is opened and the slide rod 10 slides into the cylinder chamber 41 and the first oil passage 45 is removed from the chamber 41a by an amount corresponding to the volume of the slide rod 10.
Oil moves. That is, at the time of this contraction, the oil
The force of contracting the slide rod 10 can be attenuated by the resistance when passing through the check valve 51. When the oil damper 6 is extended, the piston 42 slides away from the second oil passage 47 so that the first check valve 48 is opened and the oil is released from the cylinder chamber 41.
From the first chamber 41a to the first oil passage 45. At the same time, the second check valve 50 is opened, and the oil moves from the second oil passage 47 to the chamber 41b of the cylinder chamber 41. At the time of extension, the resistance when oil passes through the first and second check valves attenuates the force for extending the slide rod 10. In the floor seismic isolation device having the above structure, when an earthquake occurs,
When the slab floor 8 slides in one direction (the direction indicated by the arrow A in FIG. 1) with respect to the seismic isolation floor 9, the inner frame 2 slides in one direction with respect to the outer frame 1. Then, the oil damper 6 extends, and in the process, the vibration force is attenuated by viscous resistance of the oil, and the joist 9 of the seismic isolation floor 71 is reduced.
Attenuate the force transmitted to At the same time, the first rods 12 and 1
4, a first engagement member 1 fixed outside the inner frame 2
6 and 18 are engaged with the inner frame 2 and slid together with the inner frame 2 and the first rods 12 and 14 to one side. Therefore, the wires 21 and 23 bend as much as the first rods 12 and 14 slide. At this time, the second engaging member 15 fixed to the second rods 11 and 13 outside the inner frame 2
And 17 are stationary without sliding with respect to the outer frame 1 and are separated from the inner frame 2. Therefore, the springs 3 and 5 extend by the amount of sliding of the inner frame 2 and store a force for restoring the inner frame 2 to a predetermined neutral position. When the sliding of the inner frame 2 in one direction is completed, the springs 3 and 5
Restores the inner frame 2 to a predetermined neutral position by contracting the oil damper 6 while resisting the viscous resistance of the oil damper 6. When the slab floor 8 slides with respect to the seismic isolation floor 9 in the other direction (the direction indicated by the arrow B in FIG. 1), the inner frame 2 slides with respect to the outer frame 1 in the other direction. . Then, the oil damper 6 contracts, and in the process, the vibration force is attenuated by the viscous resistance of the oil, and the force transmitted to the joist 9 of the seismic isolation floor 71 is attenuated. At the same time, the second engaging members 15 and 17 fixed to the second rods 11 and 13 outside the inner frame 2 engage with the inner frame 2 and engage with the inner frame 2 and the second rod body. Slide to the other with 11,13. Therefore, the wires 20 and 22 bend as much as the second rods 11 and 13 slide. At this time, the first engagement members 16 and 18 fixed to the first rods 12 and 14 outside the inner frame 2 are separated from the inner frame 2 without sliding with respect to the outer frame 1. Therefore, the spring 3
And 5 extend by the amount of sliding of the inner frame 2 and store a force for restoring the inner frame 2 to a predetermined neutral position. When the sliding of the inner frame 2 to the other end is completed, the springs 3 and 5 extend the oil damper 6 while resisting the viscous resistance of the oil damper 6, and restore the inner frame 2 to a predetermined neutral position. As described above, according to this embodiment, the oil damper 6 operates when the slab floor 8 moves in both directions with respect to the seismic isolation floor 9, and the seismic isolation floor 71 responds to the vibration of the slab floor 8. Vibration can be reduced. Further, the springs 3 and 5 extend in response to the movement of the slab floor 8 in both directions with respect to the seismic isolation floor 9, and store a force for restoring the inner frame 2 to a predetermined neutral position. Can be returned to neutral position. According to the above embodiment, both ends 3a, 3b and 5a, 5b of the springs 3 and 5 are connected to the rods 11 and 1 respectively.
2 and 13, 14 and wires 20, 21 as flexible members
Since they are connected to the outer frame 1 via, and 22 and 23, the initial tension of the springs 3 and 5 can be set at the time of assembly. Therefore, unlike the conventional example, there is no need to set the initial tension of the springs 3 and 5 when attaching the springs 3 and 5 to the slab floor 8 and the seismic isolation floor 71. Due to this initial tension, the seismic isolation floor 71 does not shake even when a person walks on the seismic isolation floor 71 when there is no seismic motion. Also, springs 3 and 5
Is made longer than the natural period of the base-isolated floor 71, the resonance of the base-isolated floor 71 can be prevented. That is, according to the above-described embodiment, it is possible to provide a floor seismic isolation device which can be operated in both directions, can set a restoring force at the time of assembly, and can be easily attached to a floor. According to the above embodiment, as shown in FIG. 6 (A), the portions C, D and E, F defined by the joists 9, 9 in the plane of the installation portion of the room where the floor seismic isolation device is installed. One floor seismic isolation device C1, D1 and E
1, F1 only needs to be attached, so that two floor A seismic isolation devices need to be attached to sections A and B, respectively,
Installation man-hour can be greatly reduced. FIG. 6B shows a cross-sectional structure of the above embodiment. In FIG. 6B, 72 is a floor panel, 9 is a joist fixed to the floor panel 72, and 7 is a floor panel.
Reference numeral 3 denotes a bearing roller for supporting the joist 9 slidably on the slab floor 8. The floor panel 72, the joist 9, and the bearing roller 73 constitute the seismic isolation floor 71. In the above embodiment, the outer frame 1 is connected to the base-isolated floor 71.
And the inner frame 2 is fixed to the slab floor 8, but conversely, the outer frame 1 may be fixed to the slab floor 8 and the inner frame 2 may be fixed to the seismic isolation floor 71. Further, the cylinder 7 of the oil damper 6 is
And the slide rod 10 is fixed to the outer frame 1,
The cylinder 7 may be fixed to the outer frame 1 and the slide rod 10 may be fixed to the inner frame. In the above embodiment, the wires as the flexible members, the first and second rods, and the springs are arranged in two rows, respectively, but may be arranged in one row. Although the wire and the first and second rods are connected to each other, the first and second rods in which the wire portion is flexible may be used. It may be. Also,
In the above embodiment, the wire is used as the flexible member. However, the wire is not extended even when pulled by the spring through the rod, and any member that is bent by being pushed by the spring through the rod is used. There may be. In the above embodiment, the inner frame 2
Although the inner frame 2 is pivotally connected to the slab floor 8 via the silling 7 fixed to the slab, the inner frame 2 may be directly pivoted to the slab floor 8. As is apparent from the above description, the floor seismic isolation device of the present invention includes a substantially rectangular outer frame, and an inner frame guided reciprocally by the outer frame. An oil damper for connecting the outer frame and the inner frame is provided, and both ends of a spring disposed in the inner frame are separated by first and second rods having a flexible portion between the inner frame and the outer frame. First and second engaging members that are connected to the frame and engage the rod and the inner frame when the inner frame slides are fixed to the first and second rods, and the direction in which the inner frame slides. The spring is extended only to the side. Therefore, according to the floor seismic isolation device of the present invention, the oil damper operates when the slab floor moves in both directions with respect to the seismic isolation floor, thereby absorbing the vibration energy of the slab floor. Further, the spring expands with respect to the movement of the slab floor in both directions with respect to the seismic isolation floor, and stores a force for restoring the inner frame to a predetermined neutral position,
The inner frame can be returned to a predetermined neutral position. Further, according to the present invention, both ends of the spring are connected to the outer frame via the flexible portion of the rod, so that the initial tension of the spring can be set at the time of assembly. Therefore, unlike the conventional example, there is no need to set the initial tension of the spring when the spring is mounted on the floor, and the spring can be easily mounted on the floor. That is, according to the present invention, it is possible to provide a floor seismic isolation device which can be operated in both directions, can set a restoring force at the time of assembly, and can be easily attached to a floor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an embodiment of a floor seismic isolation device of the present invention. FIG. 2A is a sectional view taken along the line AA of FIG.
(B) is a BB cross-sectional view of FIG. 1. FIG. 3 is a sectional view taken along line CC of FIG. 1; FIG. 4 is a sectional view showing the internal structure of the oil damper of the embodiment. FIG. 5A is a plan view of a conventional floor seismic isolation device, and FIG. 5B is a side view of the conventional example. FIG. 6A is a plan view showing an example of mounting a floor seismic isolation device to a building, and FIG. 6B is a side view of the above mounting example. [Description of Signs] 1 ... outer frame, 2 ... inner frame, 3,5 ... spring, 6 ... oil damper, 7 ... cylinder, 8 ... slab floor, 9 ... joist, 1
0: slide rod, 11, 12, 13, 14: rod,
15, 16, 17, 18 ... engaging member, 20, 21, 22
2, 23 ... wire, 25, 26 ... side plate, 27, 28, 2
9, 30: roller, 31: washer, 32: nut, 33,
34 ... guide part, 35, 36 ... pad, 41 ... cylinder chamber, 42 ... piston, 43 ... oil passage, 45 ... first oil passage, 46 ... constricted part, 47 ... second oil passage, 48 ... first non-return Valve, 50: second check valve, 51: third check valve.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Daisuke Yaguchi 1-9-131 Shinonome, Koto-ku, Tokyo Mitsubishi Steel Corporation Sound and Vibration Department (72) Inventor Kinasa Inaba 2-chome Matsuzakicho, Abeno-ku, Osaka-shi, Osaka No. 2 No. 2 Okumura Gumi Co., Ltd. (72) Inventor Masahiro Kurimoto 2-2-2 Matsuzakicho, Abeno-ku, Osaka-shi, Osaka No. 2 Okumura Guminai Co., Ltd. (56) References Japanese Utility Model No. 4-13846 (JP, U) Patent 2619564 (JP, B2) Patent 2736532 (JP, B2) JP-B-58-36144 (JP, B1) JP-B 2-42995 (JP, B2) JP-B 3-74304 (JP, B2) (58) Survey Field (Int.Cl. ⁷ , DB name) E04F 15/18 601

Claims (1)

(57) [Claim 1] A substantially rectangular outer frame, an inner frame guided reciprocally by the outer frame, and an inner frame arranged inside the outer frame, An oil damper for coupling the inner frame; a spring disposed in the inner frame, which can expand and contract in the reciprocating direction of the inner frame; one end connected to one end of the spring, and extending in the reciprocating direction of the inner frame. And the other end is fixed to one end of the outer frame through one end of the inner frame in the reciprocating direction, and at least a portion between the one end of the inner frame and the one end of the outer frame is flexible. A first rod body, one end of which is connected to the other end of the spring, extends in the reciprocating direction of the inner frame, and the other end penetrates the other end of the inner frame in the reciprocating direction of the outer frame; A second rod fixed to the other end and having at least a flexible portion between the other end of the inner frame and the other end of the outer frame; an outer surface of the inner frame; A first engaging member fixed to the first rod so as to contact the inner frame to bias the inner frame to the neutral position; and a first engaging member fixed to the first rod body to abut the outer surface of the inner frame to attach the inner frame to the neutral position. A second engaging member fixed to the second rod body so as to urge each other, and one of the inner frame and the outer frame is rotatably fixed to the slab floor and the other to the seismic isolation floor. A floor seismic isolation device characterized in that: