JPH069234Y2 - Seismic isolation device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a seismic isolation device, and more particularly to a seismic isolation device configured such that a spring force acts only when a base supporting an object is moved.

2. Description of the Related Art For example, in a device, such as a computer device, in which a precision mechanism (a control circuit, a magnetic disk device, a storage device such as a magnetic tape recorder, etc.) provided inside is damaged once it has fallen, an earthquake may occur. Measures to prevent collapse due to occurrence are taken. That is, an object to be placed, such as a device that easily collapses, is placed on a seismic isolated floor configured so that the vibration of the building due to the earthquake is not transmitted. A seismic isolation device for isolating the vibration of the building is provided between the seismic isolation floor and the fixed floor of the building.

As a conventional seismic isolation device, for example, "Japanese Patent Laid-Open No. 62-862" is used.
No. 65 ”publication. This is roughly composed of a floor structure on which an object is placed, a moving bearing (having bearing balls) for slidably supporting the floor structure with respect to a fixed floor of a building, and a floor structure. It consists of a spring damper part that returns to the position before the movement. This spring damper part damps the acceleration of the mover connected to the floor structure by the resistance force of the viscous liquid at the time of an earthquake, and urges the mover by the pulling force of the four radially stretched springs. Has become. Therefore, the mover connected to the floor structure is normally held at a position where the tensile force of each spring is balanced.

Problems to be Solved by the Invention In the above-described seismic isolation device, the floor structure that has slid in the event of an earthquake is configured to return to the pre-sliding position by the pulling force of springs arranged in four directions. When installing on the floor, each spring will be installed while pulling, and not only is the installation work troublesome, but the mover is easily displaced to a position displaced from the predetermined position during the installation of the springs in each of the four directions There is a problem that it is difficult to install it in a proper position.

Further, in the above-described seismic isolation device, if the spring constants of the springs are not the same even after installation, there is a problem that the position of the mover is displaced and an installation error is likely to occur.

Then, this invention aims at providing the seismic isolation apparatus which solved the said subject.

Means for Solving the Problems The present invention provides a base that supports a mounted object and is slidably provided on a floor surface; one end is fixedly held to the floor surface and the other end is displaceable. A plurality of spring members that are free ends; a restraint member that restrains the other end of the spring members from the free length in one direction by a predetermined amount; one end that is connected to the base; A rod that presses the restraint member against the spring force of the spring member when sliding in one direction, and separates from the restraint member when the other end slides in the other direction.

Action During installation work, the rod can be attached while the spring member is kept in a constant length by the restraining member,
The installation can be performed without being affected by the spring force, the installation work can be performed more easily than before, and the installation can be accurately performed at a predetermined installation position.

Embodiment FIG. 1 to FIG. 3 show an embodiment of the seismic isolation device according to the present invention.

In each figure, a seismic isolation device 1 is installed on a fixed floor 2 of a building, and a seismic isolation body 4 supporting the seismic isolation floor 3 and a plurality of seismic isolation devices 4 provided in the horizontal direction of the seismic isolation body 4 (four in this embodiment) are provided. ) And the buffer mechanism 5).

On the seismic isolated floor 3, for example, a precise device (not shown) such as a computer device is placed as an object to be placed. Then, the seismic isolation device 1 maintains a non-operating state during normal operation, and when an earthquake having a seismic intensity equal to or higher than a predetermined level occurs, seismic isolation device 1 performs seismic isolation operation as described later. Therefore, the seismic isolation device 1 fixedly holds the seismic isolation floor 3 by the action of the cushioning mechanism 5, and prevents the object placed on the seismic isolation floor 3 from collapsing when an earthquake occurs. Seismic isolation operation. The seismic isolation device 1 is installed in a well-balanced manner at, for example, four corners of the seismic isolation floor 3.

First, the structure of the seismic isolation main body 4 will be described. Seismic isolation body 4
Is generally composed of a lower base 6, roller mechanisms 7, 8, an intermediate base 9, an upper base 10, and a vertical buffer mechanism 11. The lower base 6 is formed of a low friction member into a smooth flat plate shape, and is placed at a predetermined installation position on the fixed floor 2.
The roller mechanisms 7 and 8 are in the directions orthogonal to each other, that is, the fourth mechanism.
As shown in the figures and FIG. 5, it is movable in the directions of arrows X and Y.

Roller mechanism 7 plurality of cylindrical rollers 12 (the 12 ₁ to 12 ₅ five rollers are arranged in parallel in this embodiment) are provided rollably arrow X _1, X ₂ direction It becomes. Each time 1
Support plates 13 that support the rollers 12 at predetermined intervals face each other at both ends of the hole 2. Each hole of each support plate 13 (not shown)
The shaft 12a of each roller 12 penetrates through. In addition, at the shaft end of each roller 12, a flange portion 12 that prevents the support plate 13 from falling off is provided.
b is provided, and the plurality of rollers 12 can be integrally moved in a parallel state at predetermined intervals.

14 (14 ₁ to 14 ₄₎ is a coil spring, one end hooked to the hooking pin 15 projecting from the lower surface of the intermediate base 9, wound around the hooking pin 16 and the other end projects laterally from the support plate 13 It has been stopped. Of the four coil springs 14 _{1 to} 14 ₄ , the coil springs 14 ₁ and 14 ₂ on the left side in FIG.
It is pulled in _one direction, and the coil springs 14 ₂ and 14 ₃ on the right side pull the support plate 13 in the direction of arrow X ₂ . for that reason,
Although the rollers 12 are interposed between the lower base 6 and the intermediate base 9, the rollers 12 _{3 in the} intermediate position are urged by the balance of the tensile force of the springs 14 so that the rollers 12 ₃ are located at substantially the center of the intermediate base 9. There is.

Further, in each spring 14, when the roller 12 rolls,
The spring 14 in the traveling direction extends and the spring 14 in the opposite direction contracts.
Then, the rollers 12 rolling in the directions of the arrows X ₁ and X ₂ return to the predetermined positions before the movement due to the spring force of the springs 14.

A pair of protrusions 9a as the lower surface of the intermediate base 9 extending in the arrow X _1, X ₂ direction, 9b (in FIG. 4, indicated by the two-dot chain line) protrudes, rollers 12 are a pair of butt Parts 9a, 9a
Is prevented from falling off from the intermediate base 9 by the pair of protrusions 9.
Roll between a and 9a.

The other roller mechanism 8 is a configuration substantially the same as that between the roller mechanism 7 described above, a plurality of rollers 17 (17 ₁ to 17 ₅₎ are rollably the upper surface of the intermediate base 9 by the arrow Y _1, Y ₂ direction It will be done.

That is, the roller mechanism 8 includes a plurality of rollers 17, a support plate 18 that supports the shaft 17a on both sides of the roller 17, and one end of the upper base 1.
The coil spring 21 (21 _{1 to} 21 ₄ ) is hooked on a hooking pin 19 protruding downward from 0 and the other end is hooked on a hooking pin 20 protruding laterally from the support plate 18. or,
Each roller 17 is prevented from falling off of the support plate 18 by the flange portions 17b at both ends, and is prevented from falling off from the intermediate base 9 by a pair of projections 9b and 9b projecting on the upper surface of the intermediate base 9. Then, each roller 17 is held at a predetermined position where the spring forces of the four springs 21 are balanced, and after movement, each spring 2
The spring force of 1 restores the original position.

A low-friction member 10a is fixed to the bottom surface of the upper base 10, and the upper and lower surfaces of the intermediate base 9 on which the rollers 12 and 17 roll are also smooth flat surfaces having a very small friction coefficient.

Therefore, when horizontal vibration is applied, the horizontal seismic isolation operation is performed by the sliding of the roller mechanisms 7 and 8 which are allowed to roll in directions orthogonal to each other in the seismic isolation device main body 4.
Further, since the plurality of rollers 12 and 17 are rotatably arranged in the roller mechanisms 7 and 8, a lower friction seismic isolation effect is obtained, and line contact is made with each base. It has the advantage that it can withstand a larger load than a ball that uses contact.

The vertical cushioning mechanism 11 is arranged between the upper base 10 and the base isolation floor 3, and is a coil spring 2 made of a relatively thick wire rod.
Vibrations in the upward and downward directions (arrow Z direction) are buffered by the expansion and contraction displacement of 2. The coil spring 22 is interposed between the upper base 10 and the spring retainer 23, and has an outer periphery of an annular protrusion 10b protruding upward from the upper base 10 and an outer periphery of an annular protrusion 23a protruding downward from the spring retainer 23. Is fitted to. or,
An adjusting screw portion 23b for adjusting the amount of compression of the coil spring 22 projects from the center of the upper portion of the spring retainer 23.

Reference numeral 24 denotes a cover, which is formed in a cup shape so as to cover the coil spring 22 and has a female screw portion 24a to which the adjusting screw portion 23 is screwed at the center of its upper surface. Furthermore, cover 2
Four brackets 24b are fixed to the upper surface of 4, and each bracket 24b is fastened via a bolt 25 to a projecting plate 3a projecting downward from the bottom surface of the base isolation floor 3.

Therefore, since the seismic isolation floor 3 is placed on the seismic isolation body 4 having the above-described configuration, even if the fixed floor 2 vibrates, the acceleration in the arrow Z direction is attenuated by the elastic displacement of the spring 22 and the horizontal direction is maintained. Vibration does not propagate to the seismic isolation floor 3 due to the seismic isolation effect of the roller mechanisms 7 and 8.

Next, the cushioning mechanism 5 forming the essential part of the present invention will be described in detail.
In the seismic isolation main body 4, since the roller mechanisms 7 and 8 perform seismic isolation operation with low friction, there is a risk that the seismic isolation operation will occur even if a force other than an earthquake acts. Therefore, the seismic isolation device 1 operates even with a comparatively small earthquake (to the extent that the mounted object does not collapse) or with a small external force such as human power. Therefore, for example, a spring member that buffers the horizontal displacement of the seismic isolation body 4 is directly attached. When trying to attach to the seismic isolation main body 4, the upper base 10 moves due to the biasing force of the spring member, and if the carelessness of the spring during the spring attachment causes the upper base 10 to shift to a biased position, the installation work is troublesome. Is.

Therefore, in the cushioning mechanism 5, the spring member is constrained in a compressed state to some extent, and the cushioning mechanism 5 does not exert any spring force on the seismic isolation main body 4 in normal times.

That is, the buffer mechanism 5 is the rod 2 connected to the upper base 10.
6, a restraint member 28 slidably provided on the rod 26 and restraining the coil spring 27 to be shorter than the free length, that is, in a compressed state, and a bearing member 29 slidably bearing the rod 26 and the restraint member 28. Consists of.

The rod 26 has a U-shaped connecting portion 26 a at one end, and the connecting portion 26 a is connected to the upper base 10 by the connecting plate 1.
0c to the direction of arrow A by pin 30 (shown in FIG. 2)
Is rotatably connected to. Further, a stopper portion 26b that prevents the restraint member 28 from coming off is provided at the other end of the rod 26. The restraint member 28 is formed in a pipe shape so that the rod 26 penetrates, and has collar portions 28a and 28b at both ends.
Have.

The bearing member 29 has a shaft 29a fitted in the hole 31a of the bearing member 31 fixed to the fixed floor 2, and the shaft 29a protruding downward is rotatably supported by the low friction member 31b in the hole 31a. ing. Therefore, the restraint member 28 and the rod 26 supported by the bearing member 29 are in the direction of arrow B (shown in FIG. 2) so as to correspond to the seismic isolation operation of the seismic isolation body 4.
It is supposed to be rotatable.

The coil spring 27 is wound around the outer periphery of the restraint member 28,
One end is in contact with the end surface of the bearing member 29, and the other end is the restraint member 2
It comes into contact with an annular spring receiver 32 that fits into the shaft 8. Therefore,
The coil spring 27 is compressed between a spring bearing 32 regulated by a restraining member 28 and a bearing member 29. Therefore, when the rod 26 moves in the direction in which the spring force of the spring 27 is increased (compression direction) along with the movement of the upper base 10, the end of the spring 27 is pressed in the compression direction via the spring receiver 32, and vice versa. It engages so as to separate from the end of the spring 27 when displaced in the direction.

However, since the collar portions 28a and 28b of the restraining member 28 contact the end faces of the spring bearing 32 and the bearing member 29, the coil spring 27 is held in the compressed state shown in FIG. Therefore, although the spring 27 is compressed, its resilience does not act on the upper base 10 at normal times.

The cushioning mechanism 5 having the above-described structure is radially arranged in four directions around the seismic isolation main body 4 as shown in FIG. That is, the four buffer mechanism 5 (5 ₁ to 5 ₄₎ is disposed in each good balance 90 degree intervals so as to damp the seismic isolation operation of the seismic isolation body 4.

Since the cushioning mechanisms 5 _{1 to} 5 ₄ arranged in this manner have the structure in which the spring 27 is constrained in the compressed state as described above, they can be carried as one assembly. Therefore, when mounting each buffering mechanism 5 ₁ to 5 _4, for example, the buffer mechanism 5 can be connected to the upper base 10 one by one, and since the spring force of the spring 27 does not act, the position deviated seismic isolation body 4 I do not.

Further, even if the mounting of the respective cushioning mechanisms 5 _{1 to} 5 ₄ is completed, the upper base 10 does not slide even when a force smaller than the spring force of the spring 27 acts under normal conditions.
Can be accurately installed at a predetermined installation position.
Moreover, even if interrupted mounting operation in the middle installation of the buffering mechanism 5 ₁ to 5 _4, the spring force of the first buffering mechanism 5 does not act on the base 10, the mounting operation is very easily do, exemption The seismic device 1 can be easily attached.

Next, the operation of the seismic isolation device 1 having the above configuration will be described.

In normal times, the spring force of each of the buffer mechanisms 5 _{1 to} 5 ₄ does not act at all, and the upper base 10 is fixedly held via the rods 26 in four directions. Therefore, as shown in FIG. 6, the seismic isolation body 4 is held in a stationary state at a predetermined position, and for example, even if a force smaller than the elastic force of the compressed spring 27 is applied, the seismic isolation body 4 does not seismically isolate and stabilizes. Keep the state.

However, in the event of an earthquake, when a force that exceeds the elastic force of the spring 27 acts, the seismic isolation body 4 seismically operates and each cushioning mechanism 5 cushions the operation of the upper base 10.

Here, it is assumed that an earthquake having a seismic intensity equal to or higher than a predetermined value occurs, and the horizontal vibration acts on the building. At this time, the case where the fixed floor 2 receives an acceleration in the direction of the arrow X ₁ will be described as an example.

When a predetermined acceleration or more in the direction of the arrow X _{1 is applied} to the fixed floor 2, the rollers 12 _{1 to} 12 _{5 of} the roller mechanism 7 roll in the direction of the arrow X ₂ as shown in FIGS. The quake body 4 is relatively displaced to the arrow X ₂ . The displacement of the seismic isolation main body 4 is transmitted to the buffer mechanism 5 via the rod 26 connected to the upper base 10.
Transmitted to ₁ . The rod 26 is displaced in the arrow X ₂ direction, and the restraint member 28 is also displaced in the same direction. As a result, the coil spring 27 is compressed, and the acceleration of the seismic isolation body 4 is attenuated.

Further, as shown in FIG. 7, in the buffer mechanism 5 ₃ arranged in the direction of the arrow X ₂ of the seismic isolation main body 4, the rod 26 has the spring 2
The spring 27 only displaces in the direction (arrow X ₂ direction) in which it separates from the tip portion of 7, and the spring 27 does not displace. Therefore, the buffer mechanism 5 ₃
The rod 26 slides in the restraining member 28 with almost no resistance, and does not buffer the displacement of the seismic isolation body 4.

Further, in the buffer mechanisms 5 ₂ and 5 ₄ arranged in the directions of arrows Y ₁ and Y ₂ orthogonal to the displacement direction of the seismic isolation main body 4, the rod 26
Respectively rotate about the shaft 29a of the bearing member 29 by an angle α, so that the rod 26 is displaced to the side of the seismic isolation main body 4 and the springs 27 are slightly compressed.

Thus, direction of arrow X ₂ displacement of the seismic isolation body 4 cushioning mechanism 5 ₁
And the springs 27 of the buffering mechanisms 5 ₂ and 5 ₄ are used for buffering.
Therefore, the acceleration of the fixed floor 2 caused by the earthquake is not transmitted to the seismic isolation floor 3 by the seismic isolation operation of the seismic isolation device 1, and the seismic isolation floor 3 is stably supported without being affected by the earthquake.

Further, the seismic isolation body 4 which is displaced in the direction of arrow X _2, the buffer mechanism 5 ₁
The spring 27 returns to its original position due to its resilience. Further, the roller mechanism 7 is moved to the first position by the tensile force of the coil springs 14 ₃ and 14 ₄ .
Return to the position shown in the figure.

Even when the fixed floor 2 receives an acceleration in the arrow X ₂ direction or the arrow Y ₁ , Y ₂ direction due to the occurrence of an earthquake, the roller mechanisms 7, 8 of the seismic isolation main body 4 and the shock absorbing mechanisms 5 _{1 to} 5 ₄ The seismic isolation works as described above. In this way, the seismic isolation device 1 effectively isolates the acceleration when an earthquake occurs. That is, the object placed on the seismic isolation floor 3 is prevented from collapsing due to the occurrence of an earthquake.

FIG. 9 shows a modification of the present invention.

In FIG. 9, the same parts as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The buffer mechanism 41 includes a rod 42, a bearing member 43 that axially slidably supports the rod 42, and a cylindrical spacer (restraining member) 44 that is fixed to the bearing member 43 and extends in the axial direction.
A spring locking member 45 fitted to the small diameter portion 42b extending to the tip of the rod 42, the spring locking member 45 and the bearing member 4
The coil spring 46 is mounted between the three locking portions 43a. The spacer 44 has a dimension longer than the free length of the coil spring 46, and both ends of the coil spring 46 are fitted into the groove formed in the spring locking member 45 and the locking portion 43 a of the bearing member 43. Are locked. Therefore, the spring 46 is constrained by the spacer 44 in a tensioned state.

Since the shaft 43a is supported by the bearing member 31 in the bearing member 43, the spring locking member 45 is pressed against the stepped portion of the rod 42 by the tensile force of the spring 46. The connecting portion 42 a at the end of the rod 42 is connected to the connecting plate 10 c of the upper base 10 via the pin 30. Therefore, the rod 42 engages with the spring locking member 45 that locks the end portion of the spring 46 when moving in the direction of increasing the spring force of the spring 46 (pulling direction) as the upper base 10 moves, and in the opposite direction. When it is displaced to, it is engaged with the spring 46 so as to be separated from the spring locking member 45.

In the buffer mechanism 41, the spring 46 is the spacer 44.
Since it is held in a tensioned state by
The urging force of the above does not act on the upper base 10. However, when a larger force is applied to the spring force of the spring 46 at the time of occurrence of an earthquake, that is, when the fixed floor 2 receives an acceleration in the direction of the arrow X ₂ , the seismic isolation main body 4 moves relatively by the arrow X ₁ due to the operation of the roller mechanism 7. Displace in the direction. In this case, the rod 42 slides in the same direction to further pull the spring 46, and the spring force of the spring 46 attenuates the acceleration of the upper base 10.

The buffer mechanism 41 is provided in four directions around the seismic isolation body 4. In the other cushioning mechanism 41, since the rod 42 is only pulled out from the spacer 44, the spring force of the spring 46 does not act on the seismic isolation body 4.

Although the displacement in each direction is buffered by the spring force in the above embodiment, it goes without saying that a damper device may be used, for example. Further, although four shock absorbing mechanisms are provided around the seismic isolation main body in the above embodiment, the present invention is not limited to this, and three or four or more shock absorbing mechanisms may be provided.

Further, although the lower base 6, the intermediate base 4, and the upper base 10 are provided in the above embodiment, the present invention is not limited to this, and there may be a base that is slid with respect to the fixed floor 2, for example. Further, in the above embodiment, each base is slidable by the roller mechanism, but it goes without saying that it is not limited to the roller mechanism.

Effect of the Invention As described above, in the seismic isolation device according to the present invention, since the rod can be attached while the spring member is kept in a constant length state by the restraining member during installation work, it is affected by the spring force. Can be installed without. Further, the spring force is not applied to the base in normal times, and the rod is engaged with the spring member along with the displacement of the base only when an external force more than a predetermined value is applied. It is possible to accurately install the seismic isolation device at a predetermined installation position without causing the base to shift to an offset position during installation. Further, even if the spring constant of the spring member in each direction varies, the base can be held in a predetermined position without error during normal times, and the mounted object can be stably supported. With the features of.

[Brief description of drawings]

1 to 3 are front views, plan views and side views of an embodiment of a seismic isolation device according to the present invention, and FIGS. 4 and 5 are plan views for explaining a roller mechanism, and FIG. FIGS. 7 and 8 are plan views showing a stopped state and an operating state of the seismic isolation device, FIG. 8 is a front view during seismic isolation operation, and FIG. 9 is a front view of a modified example of the present invention. DESCRIPTION OF SYMBOLS 1 ... Seismic isolation device, 2 ... Fixed floor, 3 ... Seismic isolation floor, 4 ... Seismic isolation main body, 5 ... Buffer mechanism, 6 ... Lower base, 7, 8 ... Roller mechanism,
9 ... Intermediate base, 10 ... Upper base, 26 ... Rod, 27
... Coil spring, 28 ... Restraint member, 29 ... Bearing member, 31
... Bearing member, 32 ... Spring receiver.

Claims (1)

[Scope of utility model registration request] 1. A base, which supports an object to be placed and is slidably provided on a floor surface, and a plurality of bases, one end of which is fixedly held to the floor surface and the other end of which is a displaceable free end. A spring member, and a restraining member that restrains the other end of the spring member from the free length in one direction by a predetermined amount, when one end is connected to the base and the other end slides in one direction A seismic isolation device comprising: a rod that presses the restraint member against the spring force of the spring member and separates from the restraint member when the other end slides in the other direction.