JP3463110B2 - Three-dimensional seismic isolation device for seismic isolation floor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a three-dimensional seismic isolation system for seismic isolation floors suitable for installation and protection of computer facilities, various research facilities, nuclear facilities, etc. Regarding the seismic device.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 4-154 discloses a floor seismic isolation device for attenuating horizontal shaking of a seismic isolation floor. Japanese Unexamined Patent Publication No. 62-86266 discloses a vertical seismic isolation device for attenuating vertical seismic vibrations of a seismic isolation floor, which is well known. Recently, a three-dimensional seismic isolation device that suppresses horizontal swaying and vertical swaying of a seismic isolation floor has also been developed (the invention of Japanese Patent Application No. 4-94443), and some have begun to put it into practical use.

[0003]

In response to a request for a three-dimensional seismic isolation floor, the conventional method of combining the horizontal seismic isolation device and the vertical seismic isolation device in combination is not rational, and is The effectiveness is low. In addition, there is a drawback in that facility construction requires much labor and cost. On the other hand, the three-dimensional seismic isolation device described in the specification of Japanese Patent Application No. 4-94443 and the application filed previously was tested, studied, and studied for practical use. Some problems and improvements were confirmed.

First, the vertical viscous damper that damps the vertical vibration of the seismic isolation floor has low practical effectiveness.
Rather, it can be replaced with a damping action due to the deformation resistance of the air spring or the sliding resistance of the vertical slide mechanism. By doing so, the structure of the three-dimensional seismic isolation device can be simplified, the number of installation steps can be saved, the trouble of adjustment can be reduced, and the economical efficiency can be improved.

Secondly, the leveling control means for the base-isolated floor is important because it is assumed that the base-isolated floor is vertically isolated, and the effectiveness and effectiveness of the self-leveling function for keeping the base-isolated floor at a constant height at all times. Nature must be ensured. Therefore, the present invention is based on the invention of Japanese Patent Application No. 4-94443, which is a prior application, and aims to improve the above-mentioned problems and points of improvement to improve the degree of perfection and the degree of practical application.

[0006]

As means for solving the above-mentioned conventional problems, a three-dimensional seismic isolation device for a seismic isolated floor according to the invention described in claim 1 is a horizontal seismic oscillation of the seismic isolated floor.
And a three-dimensional seismic isolation device that suppresses vertical shaking.
Te, horizontally steel frame 2 of MenShinyuka 25 on the floor slab 3 36
Consists of a floor support 1 that supports free and smooth movement in all directions of 0 ° and up and down, and a buffer unit (energy absorbing unit) that attenuates horizontal and vertical movement of the seismic isolation floor. did. The floor support portion 1 has a structure in which a plurality of steel balls 17 rolling on the plane of a steel plate 18 fixed on the floor slab 3 are interposed at the feet of a vertical supporter that supports the steel frame base 2 of the base isolation floor. Is. The horizontal shock absorbing portion of the seismic isolation floor is composed of a viscous damper 4 that resists movement of the seismic isolation floor, and a tension type horizontal spring mechanism 12 that generates a restoring force of the seismic isolation floor that has moved in the horizontal direction. The horizontal spring mechanism 12 and the primary side of the viscous damper 4 are fixed to the floor slab 3,
The secondary side is connected to the steel frame 2 of the base isolation floor. The vertical buffer portion of the seismic isolation floor is a steel ball 1 at the foot of the floor support portion.
A compression type vertical air spring that is provided between the support part above 7 and the steel frame 2 and always supports the load of the base isolation floor.
70 and the steel ball 17 at the center of the air spring 70.
Provided vertically upward on the upper part of the support part above
Vertical downward from the upward guide 14 and the steel frame 2 of the seismic isolation floor
Is installed on the upper surface of the upper guide 14
Vertical sledding with the downward guide 16 fitted together
It is composed of a de mechanism, meter the vertical displacement of MenShinyuka
Of the air spring 70 controlled by a level sensor for measuring
Each is characterized by having an air pressure control means (FIGS. 1 to 3).

[0007]

[0008]

The invention described in claim 2 is the same as that described in claim 1.
In the three-dimensional seismic isolation device for the seismic isolated floor mounted, a tension type horizontal spring mechanism 12 that constitutes a horizontal buffer portion of the seismic isolated floor 12
Is configured in the form of a cylinder 12a and a plunger 12b in which a primary side and a secondary side are slidably fitted together,
Both ends of the tension coil spring 11 are fixed between the rear end of the cylinder 12 and the front end of the plunger 12b, and a portion where one end of the coil spring 11 is fixed is fixed at the other end. It is also characterized in that a pretension introducing mechanism for expanding and contracting the coil spring 11 is additionally provided between the two.

[0010]

The invention described in claim 3 is the same as that described in claim 1.
In the three-dimensional seismic isolation device for the seismic isolation floor mounted, the horizontal spring mechanism and the viscous damper that constitute the horizontal buffering portion of the seismic isolation floor have a damper rod 10a and its piston 10 in a cylinder 6 containing a working fluid. The piston 10 is provided with an orifice 9 for communicating the front chamber 7 and the rear chamber 8 in the cylinder 6 containing the working fluid, and a coil spring 11 for tensioning is wound around the cylinder 6. The one end of the coil spring 11 is fixed to the rear end portion of the cylinder 6, and the other end is fixed to the front head portion of the damper rod 10a, which is replaced by a piston-cylinder type horizontal spring damper mechanism. , The damper rod 1
0a is connected to the seismic isolated floor 25, and the cylinder 6 side tyro
The cord 32 is fixed to the floor slab 3, and a pretension introducing mechanism that expands and contracts the coil spring 11 between the part where one end of the coil spring 11 is fixed and the other end is fixed. Characterize.

The invention described in claim 4 is the same as that described in claim 3.
In the three-dimensional seismic isolation device for the seismic isolated floor mounted, a horizontal spring damper mechanism 5 that constitutes a horizontal buffer portion of the seismic isolated floor
Is a shock-absorbing part P provided on the steel frame 2 of the seismic isolation floor or a floor bearing 1 supporting the steel frame 2 and a plurality of units arranged around the braking part P or the floor bearing 1 as a center. Installed as one set, the inward secondary side of each horizontal spring damper mechanism 5 is connected to the buffer action portion P or the floor support portion 1 by a chain 15 that is sufficiently longer than the vibration stroke of the base isolation floor, and the primary side is It is also characterized in that it is fixed to the floor slab 3 (Figs. 11A and 11B).

[0013]

[Operation] Floor slab 3 due to horizontal force acting on buildings
When the steel plate moves horizontally, the seismic isolated floor 25 (of which is the steel frame pedestal 2) supported by the floor support portion 1 on the same floor slab 3 has a steel ball 17 interposed between the floor support portion 1 and the floor slab 3. Due to the rolling
It moves relatively smoothly with a small frictional resistance. Thus, when the seismic isolated floor moves horizontally relative to the floor slab 3,
In the viscous body damper which constitutes the horizontal buffer, the viscous resistance receiving body 4d receives the viscous shear resistance of the high viscous body 4b to absorb energy, softly damp horizontal vibration of the base isolation floor, and long-term vibration period. And the amount of displacement (vibration stroke) is reduced. At the same time, the tension-type horizontal spring mechanism 12 that also constitutes the horizontal buffering unit
And the floor slab 3 are moved relative to each other and are stretched to accumulate a restoring force. Therefore, the seismically isolated floor that has moved relatively is gently restored to its original position by the restoring force of the horizontal spring mechanism 12.

If a pretension is introduced into the horizontal spring mechanism 12, relative movement of the seismic isolation floor will be completely restrained and a seismic isolation will be performed for a horizontal input equal to or less than the pretension. Unpleasant micro vibration of the floor is prevented. When a vertical force due to an earthquake or the like acts on the seismic isolation floor 25 and the seismic isolation floor (the steel frame pedestal 2 of the seismic isolation floor) sways in the vertical direction, this sway is vertically slidable in the vertical direction (vertical direction) that constitutes the floor support 1. The compression type vertical spring mechanism (air spring 70), which is freely permitted by the direction slide mechanisms 14 and 16 but at the same time constitutes the vertical shock absorbing portion of the seismic isolation floor, operates in the vertical direction of the seismic isolation floor by vertical input. As a deformation resistance against movement, it exerts a damping action and at the same time stores a restoring force. Therefore, the base isolation floor 25 is restored to its original position (constant height position) by the vertical spring mechanism.

When the seismic isolation floor 25 is displaced in the vertical direction due to an earthquake or a change in the applied load, the displacement is measured by a level sensor, and the air pressure in the air chamber of the air spring 70 is increased or decreased to keep the floor level constant. Kept in. Air spring 70
Has an effective damping action as a deformation resistance against vertical vibration of the base-isolated floor 25, and therefore, it is not necessary to separately provide a damping portion for damping.

As described above, the action of the horizontal seismic isolation against the horizontal shaking and the action of the vertical seismic isolation against the vertical shaking are combined at the same time, and the effect of the three-dimensional seismic isolation is achieved. To be done.

[0017]

EXAMPLE An example of the present invention shown in the drawings will be described below.
The three-dimensional seismic isolation device for the seismic isolation floor shown in FIGS. 1 to 3 is constructed by a floor support 1 on a concrete floor slab 3 corresponding to the floor frame of each floor of the building. Is supported at a height of approximately 250 to 300 mm. The seismic isolation floor is completed by placing a floor plate 25 on the steel frame base 2, and OA equipment is installed on the seismic isolation floor for use.

As shown in the layout pattern in FIG. 2 or FIGS. 8A and 8B, the floor support portion 1 has a plan shape of the seismic isolated floor (of the steel frame pedestal 2), a size of a load and stability of support. It is arranged at an appropriate pitch in consideration. As shown in detail in FIG. 5, the floor support 1 has a large number of steel balls 1 at its feet.
It supports the seismic isolated floor by using the rolling of 7 and smoothly moving in all directions of 360 ° in the horizontal direction with a small friction resistance. Specifically, the diameter fixed horizontally on the upper surface of the floor slab 3 is 80
The upper steel plate 19 is placed on a steel ball 17 rolling on a steel plate 18 of about 0 mm. The steel ball 17 has a steel ball circulation path that allows the steel ball to circulate and move while rolling. The steel ball 17 is assembled by a steel ball retainer 43 mounted so as to cover the outer periphery and the upper portion of the mounting steel plate 19. Have been detained. The top-mounted steel plate 19 has an inverted T shape, and its peripheral portion is formed in a semicircular shape suitable for smoothly circulating the steel ball 17 by sandwiching the steel ball 17 with the steel ball retainer 43.
A wide spring bearing plate 51 is fixed substantially horizontally on a short shaft portion 19a that rises above the mounting steel plate 19, and the shaft portion 19a is provided at a substantially central portion of the upper surface of the spring bearing plate 51.
Cylindrical upward guide 14 with the same center line
Are provided vertically upward. On the other hand, a reaction force receiving plate 52 made of a circular steel plate is provided at a corresponding position on the lower surface of the steel frame base 2.
Is fixed by means such as bolts and the like, and the downward guide 1 having substantially the same diameter as the inner diameter of the upward guide 14 shares a center line with the upward guide 14 at approximately the center of the reaction force receiving plate 52.
6 is provided downward, and the downward guide 16 is slidably fitted to the slide bearing 13 of the upward guide 14 to form a vertical slide mechanism. By the operation of the vertical slide mechanism, vertical vibration of the steel frame pedestal 2 is allowed, and horizontal force is transmitted.

Between the spring receiving plate 51 and the reaction force receiving plate 52, as a compression type spring mechanism constituting a vertical buffering portion of the seismic isolation floor, it has a strength that always supports the top load of the seismic isolation floor. An air spring 70 is installed so as to surround the outer periphery of the vertical sliding mechanism in a concentric arrangement. The air spring 70 is provided with automatic air pressure control means for compensating for variations in air pressure during a long service period and keeping the floor level constant as follows. In FIG. 1, 60 is a compressor for generating and supplying compressed air, which is connected to the leveling valve 61 by an air pipe. The capacity of the compressor 60 is about 4.6 kg / cm ² . As shown in detail in FIGS. 6A and 6B, the specific structure of the leveling valve 61 is an automatic opening / closing valve that also serves as a level sensor, and is expressed by a JIS symbol as shown in FIG. 6C. The leveling valve 61 is fixedly installed on the lower surface of the reaction force receiving plate 52, and the roller 61b of the arm 61a, which is the input end of the leveling sensor, is brought into contact with the outer surface of the air spring 70 to vertically move the air spring 70. It is measured by the rotation angle of. Point B in FIG. 6B is the neutral position, point B is the downward displacement position, and point C is the upward displacement position. The valve body 61c is automatically opened and closed according to the rotational displacement of the arm 61a. The leveling valve 61 is connected to an auxiliary tank 62 by an air pipe, and the auxiliary tank 62 is further connected to an air chamber of an air spring 70 by an air pipe 63. The auxiliary tank 62 is used to obtain an appropriate spring constant in the vertical direction of the air spring 70, and is fixed to the steel frame base 2. The load on each floor bearing is designed to be about 1000 kg, and the air spring 70 with an effective outer diameter of about 16 cm is the intermediate ring 7.
1 has a three-stage bellows structure, and its air chamber has about 4 kg / cm
Air pressure of about ² is supplied. The air spring 70 is deformed by about 25 mm under the load of 150 kg. When the leveling valve 61 measures the contraction deformation, the compressor 60 pressurizes the auxiliary tank 62 and the air pressure in the air chamber of the air spring 70 to expand the air spring 70 to keep the floor level constant. When vertical vibration (the steel frame 2 of the seismic isolation floor) is generated by the vertical force acting on the seismic isolation floor, the air spring 70 serves as a deformation resistance of the air spring 70, which has a damping action of slowing the vertical movement and reducing the displacement. To be done. The above-mentioned damping action exerts a good seismic isolation effect not only for large earthquakes but also for small vertical vibrations caused by wind loads, weak earthquakes, or passage of large vehicles.

Next, in the embodiment shown in FIG. 1, a tension type horizontal spring mechanism 12 which constitutes a horizontal buffer portion of the base isolation floor.
Is a right angle 4 with the floor bearing 1 as the center, as shown in FIG.
Are arranged in the direction. The inward secondary side of each horizontal spring mechanism 12 is provided with a chain 15 (specifically, see FIG. 9) having a length sufficiently longer than the horizontal vibration stroke of the seismic isolation floor. The primary side is fixed to an anchor 20 fixed to the floor slab 3. As shown in FIGS. 7A and 7B, the specific structure of the horizontal spring mechanism 12 is a plunger type cylinder in which a plunger 12b is slidably incorporated in a cylinder 12a, and an outer circumference of the plunger type cylinder. And a tension spring 11 wound around. The front end of the tension spring 11 is fixed to the outer circumference of the spring receiver 31 on the front head of the plunger 12b. The cylinder 12a
The base end of a tie rod 32 for connecting with the anchor 20 fixed to the floor slab 3 is screwed into the cylinder head 33 at the rear end portion of the lock tie 3.
It is fixed by 5 and protrudes in the axial direction. In the sleeve portion 22a of the sleeve type dial 22 screwed into the male screw 32a on the outer periphery of the tie rod 32, the spring bearing 4
0 is rotatably installed, the rear end of the tension spring 11 is fixed to the outer periphery of the spring receiver 40, and a pretension introducing mechanism for expanding and contracting the tension spring 11 with the spring receiver 31 is configured. ing. The stop flange 22b prevents the spring receiver 40 from coming off. The tie rod 32 is passed through the anchor 20 fixed to the floor slab 3 and fixed with a nut. One end of a chain (or wire may be used) is connected to the front end of the plunger 12b, and the other end of the chain is fixed to the outer edge of the spring receiving plate 51 that constitutes the floor support 1.

Therefore, in the horizontal spring mechanism 12, when the dial 22 of the pretension introducing mechanism is rotated, for example, in the forward direction, the spring receiver 40 is moved to the right as shown in FIG. 7B by the screw movement with the tie rod 32. The tension spring 11 is extended by an amount corresponding to an increase in the distance from the front spring receiver 31, and a considerable pretension is set. The pretension set in this way takes a reaction force to the relationship in which the tip of the cylinder 12a abuts the spring receiver 31 of the plunger 12b and the rigidity in normal times, and self-holds. Therefore, when the horizontal force acting on the building due to an earthquake or the like is less than or equal to the pre-tension, the sway of the seismic isolated floor (of the steel frame pedestal 2) is completely restrained as an effect of the pre-tension, and relative to the floor slab 3. No movement will occur. In other words, weak horizontal vibrations that are generally caused by wind loads and large vehicles traveling on the road are completely prevented,
Daily unpleasant shaking of the seismic isolated floor is eliminated. Only when a horizontal force equal to or greater than the pretension set on the horizontal spring mechanism 12 is applied, the seismic isolation floor causes relative horizontal movement between itself and the floor slab 3 to the side opposite to the movement direction. Only the horizontal spring mechanism 12 located is pulled through the chain,
The spring force corresponding to the extension amount of the tension spring 11 is accumulated as a restoring force. In the case of the horizontal spring mechanism 12 shown in FIG. 7A, the expansion / contraction operation and directionality of the tension spring 11 are restricted by the sliding relationship between the cylinder 12a and the plunger 12b. In the above-mentioned horizontal movement of the seismic isolation floor, each chain bends and exerts no force except for the horizontal spring mechanism located on the opposite side of the movement direction. The base-isolated floor that has reached the end of the vibration stroke (amplitude) is pulled back by the horizontal spring mechanism 12 that has accumulated the restoring force as described above, and slowly restores to its original position.

Next, a trough-shaped viscous damper 4 is shown in FIG. 4 as a horizontal viscous damper which also constitutes a horizontal buffer portion of the seismic isolation floor and resists movement of the seismic isolation floor.
As shown in FIG. 2 or FIGS. 8A and 8B, the arrangement of the viscous damper 4 is a position completely independent of the floor support 1 and the horizontal spring mechanism 12, and is considered with respect to the plane of the seismic isolation floor. It is installed in the number and arrangement decided by. The trough-shaped viscous damper 4 has a diameter of about 700 as an example.
A shallow container (basket) 4a having a height of about 100 mm and an opening of about 100 mm is fixed on the floor slab 3 by means of an insert anchor or the like, and a silicon-based or butane-based container is placed in the shallow container 4a. Highly viscous substance 4b which is a molecular compound (viscous substance)
Is housed. On the other hand, at a corresponding position on the lower surface of the steel frame base 2 of the seismic isolation floor, a transmission rod 46 for transmitting viscous resistance is projected downward, and a thin viscous resistance is attached to a lower end of a cylinder 45 into which the transmission rod 46 is slidably fitted. The receiving plate 4d is attached substantially horizontally. The viscous resistance receiving plate 4d is immersed in the highly viscous body 4b, and a parallel viscous resistance gap s of about several mm is held between the viscous resistance receiving plate 4d and the bottom surface of the shallow container 4a. The gap s
Is secured by a structure in which a slider 4e having a thickness s fixed to the viscous resistance receiving plate 4d bottoms on and slides on the bottom of the shallow container 4a. Therefore, the seismic isolated floor (of the steel frame 2) and the floor slab 3
The viscous resistance receiving plate 4 in the high-viscosity body 4b along with the relative movement with
When d is moved horizontally, viscous shear resistance of a certain magnitude acts on the viscous resistance receiving plate 4d, and damping action is exerted on the seismic isolation floor. The magnitude of the viscous shear resistance force depends on the viscosity coefficient of the high-viscosity body 4b and the area of the viscous resistance receiving plate 4a that moves relative to each other.
In addition, it is proportional to the relative speed thereof and inversely proportional to the size of the viscous resistance gap s on the two surfaces (the bottom surface of the shallow container 4a and the lower surface of the viscous resistance receiving plate 4b). The viscous shear resistance is 3
If the velocity is the same in all 60 ° directions, the magnitude is constant regardless of displacement amplitude and frequency. When a relative velocity is applied to the viscous resistance receiving plate 4d, the viscous shear resistance force exhibits a steep rising in a rectangular wave shape, reacts extremely sensitively to vibration, and has excellent damping response. Therefore, this viscous damper 4
The seismic isolation effect is well demonstrated not only for large earthquakes but also for small horizontal vibrations caused by wind loads, weak earthquakes, or passage of large vehicles. This seismic isolation effect becomes more remarkable as the highly viscous and highly viscous body 4b is used. On the other hand, as shown in FIG. 3, the mounting plate 21 is provided by the vertically upward height adjusting bolts 27 under the support plate 23 which is horizontally fixed between the beams of the steel frame 2 and fixed. The above-mentioned transmission rod 4 is vertically downward from the lower surface of the mounting plate 21.
6 is protruding. Then, the viscous resistance receiving plate 4d
A vertically upward cylinder 45 is erected on the upper surface of the above, and the transmission rod 46 is slidably fitted into the cylinder 45 to form a vertical slide mechanism. The slide between the transmission rod 46 and the cylinder 45 allows the height of the steel frame 2 to be varied, and the horizontal viscous shear resistance acting on the viscous resistance receiving plate 4d is reliably transmitted to the steel frame 2. Reference numeral 24 in FIG. 3 is an anchor bolt for fixing the shallow container 4a to the floor slab 3. The seismic isolation floor (free access floor panel) 25 is about 400 to 600 mm above the steel frame base 2 by a rod-shaped support (pedestal) 26.
It is supported substantially horizontally at the height position.

FIG. 8 shows a pattern layout of the main components of the three-dimensional seismic isolation device described above.
It is A. A tension type horizontal spring mechanism 12 is installed in a radial arrangement in four directions at right angles around a plurality of selected floor bearings 1. Further, as in the arrangement pattern shown in FIG. 8B, the tension-type horizontal spring mechanism 12 is installed in a radial arrangement in four directions at right angles with a plurality of cushioning action parts p defined in the steel frame base 2 of the base isolation floor as the center. It can also be implemented in a configuration. Further, as shown in FIG. 8C or D, it is possible to change the number and the installation angle of the spring mechanism 12 so that the spring mechanism 12 can be installed so as to work in all 360 ° horizontal directions.

[0024]

[Second Embodiment] The floor support portion 1 and the vertical buffer portion combined with the floor support portion 1 may be constructed as shown in FIG. Mortar 4 for height adjustment on the floor slab 3
1, a flat plate-shaped steel plate 18 is horizontally fixed by a holder casing 42, the upper surface of the steel plate 18 is freely rolled, and a plurality of steel balls 17 whose assembly state is restrained by a retainer 43 are also mounted on the holder casing. A flat plate-shaped top-mounted steel plate 19 held by 44 is placed horizontally. At the center of the upper surface of the holder casing 44 of the mounting steel plate 19,
Similar to the embodiment of FIG. 5, a cylindrical upward guide 14 is provided vertically upward. On the other hand, a reaction force receiving plate 5 made of a flat circular steel plate is provided at a corresponding position on the lower surface of the steel frame base 2.
2 is fixed by means such as bolts, and the center line of the reaction force receiving plate 52 is downwardly shared with the upward guide 14 and the downward guide 16 having substantially the same diameter as the upward guide 14 is vertical. It is provided downward and is slidably fitted in the upward guide 14 to form a vertical slide mechanism. The vertical movement of the steel frame 2 is allowed by the slide of the vertical slide mechanism, and horizontal force is transmitted. The above-mentioned steel plate 1
A structure in which an air spring 70 having a strength to support the top load of the seismic isolation floor surrounds the outer circumference of the slide mechanism in a concentric arrangement between the upper surface of the holder casing 44 and the lower surface of the reaction force receiving plate 52. It is installed in. The chain 15 extending from the secondary side of the tension-type horizontal spring mechanism that constitutes the horizontal buffer portion is the holder casing 4 of the mounting steel plate 19.
It is fixed to the peripheral portion of No. 4. Therefore, when the seismic isolation floor swings in the vertical direction, the deformation resistance of the air spring 70 exerts a damping action that makes the swing gentle motion and reduces the displacement amount.

[0025]

[Third Embodiment] FIG. 10 shows a tension-type horizontal spring mechanism that generates a restoring force to restore a horizontally isolated base-isolated floor to its original position, and a horizontal movement of the base-isolated floor that resists and buffers the same. The figure shows a piston / cylinder type spring damper device 5 that is combined with one horizontal viscous damper and that has a pretension introducing mechanism. In this spring damper device 5, a piston 10 is slidably installed in a cylinder 6 that contains oil as a working fluid (in this case, it is not necessary to be a highly viscous body), and its piston rod 10a has a sleeve. The oil seals 29 and 30 of 28 are threaded into a screw hole of a shaft coupling 31 having a tapered conical shape and also serving as a spring for about half the length. The outer diameter of the cylinder 6 is about 30 and the effective stroke of the piston 10 is about 250 mm. A damper rod 36 is threadedly connected to approximately the outer half of the screw hole of the shaft coupling 31 on a common center line with the piston rod 10a, so that the shaft coupling 31, the damper rod 36, and the piston rod 10a are integrated. It is configured to work. The piston 10 has a plurality of orifices 9 that axially connect the front chamber 7 and the rear chamber 8 of the piston 10. Moreover, a part of the orifice 9 on the rear chamber side of the piston 10 is pushed open by the flow pressure of the working fluid flowing from the front chamber 7 toward the rear chamber 8 through the orifice 9 when the piston 10 advances. A stop valve 34 is installed. That is, during the restoring (contracting) operation in which the piston 10 moves to the right in FIG. 10, the check valve 34 is pushed open by the flow pressure, and all the orifices 9 ... Are opened, so that the flow resistance of the working fluid is significantly increased. (Throttle effect is small), and the piston 10 moves forward with low resistance and lightly by the action of the coil spring 11. That is, the restoring operation of the spring damper device 5 is smooth and quick, and there is no concern about buckling of the piston rod 10a. On the contrary, during the extension operation (during the damping action) in which the piston 10 moves to the left in FIG. 10,
Some of the orifices 9 are closed by the check valve 34, and a large flow resistance (throttle effect) is exerted on the working fluid that is confined to the remaining orifices 9 and becomes a damping force. In the case of this spring damper device 5, the left end of the coil spring 11 for tensioning is fixed by winding around the outer periphery of the tapered conical shaft coupling 31, and the right end is provided at the right end of the cylinder 6 as a separate body from the same. It is fixed to the outer circumference of the spring receiver 40 that constitutes the pretension introducing mechanism. A base end of a tie rod (screw shaft) 32 is screwed into a cylinder head 33 at the rear end of the cylinder 6, and the tie rod 32 fixed by a lock nut 35 is projected rightward in the axial direction. The spring bearing 40 is rotatably installed on the outer circumference of the sleeve portion 22a of the sleeve type dial 22 screwed into the male screw 32a on the outer circumference of the tie rod 32. The stop flange 22b prevents the spring receiver 40 from coming off. Therefore, when the sleeve type dial 22 is rotated in the forward and reverse directions, the spring support 4 is rotated by the screw movement with the tie rod 32.
As a result of 0 being moved in the left-right direction and the distance from the front shaft coupling 31 being changed in magnitude, the coil spring 11 is expanded and contracted, and the coil spring 11 is set with a pre-tension having a size corresponding to the expansion and contraction amount. This pre-tension is normally held between the shaft joint 31 and the rear spring receiver 40 based on the structure in which the cylinder 6 and the sleeve 28 abut against the shaft joint 31, and is self-held. Therefore, when the horizontal input such as the seismic force is equal to or less than the pretension set as described above, the piston 10 is not moved, and the vibration of the base isolation floor is completely restrained. This spring damper device 5 is used in the same manner as the horizontal spring mechanism 12 of FIG. 1, in which one end of the chain is connected to the damper rod 36 and the other end of the chain is connected to the spring receiving plate of the floor support portion. It The tie rod 32 is passed through an anchor fixed on the floor slab and fixed with a nut.

FIG. 11A shows an embodiment in which four spring damper mechanisms 5 are arranged in four directions at right angles with a plurality of floor bearings 1 supporting the base isolation floor as the center, similar to the pattern of FIG. 8A. Reference numeral 11B shows an embodiment in which four spring damper mechanisms 5 are arranged in four directions at right angles with a plurality of cushioning action portions P defined in the steel frame 2 as the center. In addition, FIG.
It is also possible to use the spring damper device 5 in a non-radial arrangement as in C and D, or in a two-direction orthogonal arrangement.

Using the spring damper device 5 described above,
The viscous damper shown in Fig. 4 is no longer needed, which makes installation of seismic isolation floors extremely easy. The spring damper device 5 can be designed and manufactured in advance in a factory with a highly accurate and permanently invariable structure, has excellent quality assurance, and is convenient for transportation and storage. Moreover,
This is because the spring damper device 5 only needs to be carried into the field and installed. It is possible to provide a floor seismic isolation device with stable performance for a long time without fear that seismic isolation performance will change during a long service period. The spring damper device 5 can be easily handled by anyone by simply carrying it to the site and setting it after it has been manufactured at the factory. It can be subtly adjusted like the trough-type viscous damper shown in Fig. 4 or a high-viscosity liquid is added. It is also maintenance-free because there is no troublesome work. By making the spring of the spring damper device 5 a compression type, it can be used as a vertical spring damper device.

The structure of the pretension introducing mechanism of each of the above-described embodiments is not limited to the structure of the sleeve type dial 22 to which the screw movement is applied. It is possible to adopt and implement various mechanisms for expanding and contracting the tension spring 11 on the outer circumference of the cylinder.

[0029]

According to the three-dimensional seismic isolation device for base-isolated floors according to the present invention, the purpose of the three-dimensional seismic isolation for seismic-isolated floors is achieved as a single system, and is widely used in office buildings and the like. Contributing to the protection of existing OA equipment from damage caused by an earthquake. The present invention, in particular, has a configuration in which the viscous body damper in the vertical direction is omitted, so that the configuration of the floor support portion is greatly simplified, the number of steps for manufacturing and installing the apparatus and the number of adjustment steps are reduced, maintenance-free, and economical. Greatly improved.

[Brief description of drawings]

FIG. 1 is an elevational view showing a main part of an embodiment of a three-dimensional seismic isolation device.

FIG. 2 is a plan view schematically showing a three-dimensional seismic isolation device.

FIG. 3 is a cross-sectional view of a viscous damper part of the three-dimensional seismic isolation device.

FIG. 4 is a detailed view of a viscous damper.

FIG. 5 is a detailed cross-sectional view of the details of the floor bearing portion by the air spring portion.

6A and 6B are side and front views of the leveling valve,
C is a JIS symbol diagram.

7A to 7D are cross-sectional views of a horizontal spring mechanism and operation explanatory diagrams of a pretension introducing mechanism.

8A to 8D are different plane layout pattern diagrams of the three-dimensional seismic isolation device.

FIG. 9 is a cross-sectional view showing another embodiment of the floor support portion.

FIG. 10 is a cross-sectional view of a spring damper mechanism.

11A to 11D are different plane layout pattern diagrams of the three-dimensional seismic isolation device.

[Explanation of symbols]

1 floor bearing 2 steel frame 3 floor slabs 4 Horizontal viscous damper (tub type) 5 Spring damper mechanism 17 steel balls 18 steel plate 19 overlaid steel plate

Front page continued (72) Inventor Masayuki Yamamoto 8-21-1, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Makoto Hara 8-2-1 Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Nobuo Yamaguchi 8-21-1 Ginza, Chuo-ku, Tokyo Stock Company Takenaka Corporation Tokyo Main Store (72) Inventor Sumio Kawaguchi 8 Kirihara-cho, Fujisawa-shi, Kanagawa OILES Industrial Co., Ltd. In-house (72) Inventor Nobuyuki Sone 1-931 Shinonome, Koto-ku, Tokyo Mitsubishi Steel Mfg. Co., Ltd. Sound and Vibration Department (56) References Japanese Patent Publication 5-87624 (JP, B2) Japanese Patent Publication 4-154 (JP, B2) Japanese Patent Publication No. 3-50861 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04F 15/18

Claims (4)

(57) [Claims] 1. A three-dimensional seismic isolation device for suppressing horizontal shaking and vertical shaking of a base-isolated floor, in which a steel frame of the base-isolated floor is horizontally 360 ° on the floor slab and vertically and vertically. a floor bearing part free and smooth movement of the can be supported, is composed of a buffer unit for attenuating movement in the horizontal direction and the vertical direction of MenShinyuka, the floor bearings are of MenShinyuka At the foot of the support supporting the steel frame, a plurality of steel balls rolling on a steel plate fixed on the floor slab are interposed, and the horizontal buffering portion of the seismic isolation floor is a movement of the seismic isolation floor. It consists of a viscous damper that resists and a tension type horizontal spring mechanism that generates the restoring force of the seismically isolated floor that has moved horizontally.
The horizontal spring mechanism and the primary side of the viscous damper are fixed to the floor slab, and the secondary side is connected to the seismic isolation floor.The vertical cushioning portion of the seismic isolation floor is the foot of the floor support portion. The vertical type air vane of the compression type provided between the support portion above the steel ball and the steel frame and always supporting the load of the base isolation floor, and the central portion of the air spring, Above the steel ball
Vertically upward facing guides on top of the support section
It is installed vertically downward from the steel frame of the seismic isolated floor and
A downward guide that is slidably fitted into the upward guide.
It is composed of a vertical slide mechanism with an id .
With a level sensor that measures the vertical displacement of the seismic isolated floor
The air pressure control means of the air spring to be controlled is provided.
Characterized Rukoto respectively, three-dimensional seismic isolation device MenShinyuka. 2. A tension type horizontal spring mechanism constituting a horizontal buffer portion of a base isolation floor is constructed in the form of a cylinder and a plunger in which a primary side and a secondary side are slidably fitted to each other. Both ends of the coil spring for tensioning are fixed between the rear end of the cylinder and the front end of the plunger.
Wherein the pretension introduction mechanism for stretching the coil spring between the fastening portion of the other end portion which is secured to one end of the coil spring is configurations attached, immune according to claim 1 Three-dimensional seismic isolation device for the seismic floor. 3. A horizontal direction forming a horizontal buffer portion of a base-isolated floor.
The direction spring mechanism and the viscous damper have a damper rod and a piston accommodated in a cylinder containing a working fluid, and the piston is provided with an orifice for communicating a front chamber and a rear chamber in the cylinder containing the working fluid. A piston-cylinder type horizontal direction in which a coil spring for tensioning is wound around the outer periphery of the cylinder, and one end of the coil spring is fixed to the rear end of the cylinder and the other end is fixed to the front head of the damper rod. Installed in the one configured as a spring damper mechanism.
And the damper rod is connected to the base isolation floor,
The tie rod on the bonder side is fixed to the floor slab, and the spring receiver that fixes one end of the coil spring expands and contracts the coil spring between itself and the fixed part on the other end.
Characterized in that it is configured as three-dimensional seismic isolation device MenShinyuka according to claim 1. 4. A horizontal buffer unit horizontal direction spring damper mechanism that make up the MenShinyuka, compared floor bearing which supports the buffering action portion or the steel frame provided steel frame of MenShinyuka ,
A plurality of groups arranged around the buffer action portion or the floor support portion are installed as a set, and the inward secondary side of each horizontal spring damper mechanism is a chain that is sufficiently longer than the vibration stroke of the base isolation floor. The three-dimensional seismic isolation device for a seismic isolated floor according to claim 3, wherein the three-dimensional seismic isolation device is connected to the buffer action portion or the floor support portion and is fixed to the floor slab on the primary side.