JPH0331782Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a seismic isolation floor device for installing precision equipment such as computers that are sensitive to vibration.

(Conventional technology) In the past, springs were placed under the floor where precision equipment was installed.
Shock-absorbing materials such as rubber were laid down, and their deflection was used to isolate the floor from earthquakes.

(Problems to be Solved by the Invention) The conventional seismic isolation method described above is effective against vibrations in the horizontal direction of the floor, but not against vibrations in the vertical direction. That is, when the cushioning member is compressed, a large reaction force is generated in proportion to the amount of compression, and the floor is pushed back by the large reaction force, making seismic isolation support of the floor impossible.

This invention allows the floor to be moved regardless of its relative displacement.
It is an object of the present invention to provide a seismic isolation floor device that can always be supported with a constant support load, that is, can be supported in a substantially floating state.

(Means for solving the problem) In this invention, the seismic isolation floor 3 is suspended from a fixed floor via constant hangers 4, and the pit floor 2
limit switches 8 and 9 that detect the upper and lower limit positions of the seismic isolation floor 3; Attach a descending electric jack 5 and connect the electric jack 5 and the seismic isolation floor 3.
A compression spring 6 is interposed between the two.

(Function) The constant hanger 4 always supports the seismic isolation floor 3 with a constant supporting force regardless of the amount of relative displacement of the seismic isolation floor 3.
Suspend. The structure and specific functions of the constant hanger 4 are well known (for example, November 25, 1971)
``Piping Handbook'' published by Kagaku Kogyosha Co., Ltd.
(pages 487 to 490). The seismic isolation floor 3 is supported in a floating state relative to the fixed floor 1 by constant hangers 4, and vibrations of the fixed floor 1 are not transmitted to the seismic isolation floor 3. Therefore, even if a relative displacement occurs between the seismic isolation floor 3 and the fixed floor, no reaction force is generated, so the seismic isolation floor 3 remains in its position. Since this causes inconvenience, the relative displacement is sensed by a limit switch and the level is automatically adjusted by a jack.

(Example) A fixed bed 1 is fixed to a construction together with a pit bed 2. The seismic isolation floor 3 is suspended from the fixed floor 1 via constant hangers 4 at its periphery. Since the constant hanger 4 always supports the seismic isolation floor 3 with a supporting force that balances the load of the seismic isolation floor 3, the seismic isolation floor 3 is in a floating state with respect to the fixed floor 1. The electric jack 5 is located below the seismic isolation floor 3 and fixed on the pit floor 2. Jyatsuki 5
A compression spring 6 is interposed between the base isolation floor 3 and the seismic isolation floor 3. In order to display the load of the spring 6, a flexible indicator rod 7 is erected on the jack 5, which is attached to the seismic isolation floor 3.
is inserted into the through hole 3c. The limit switches 8 and 9 are connected to a support 2a installed on the pit floor 2.
The lever is fixed to the top of the seismic isolation floor 3 and is arranged so as to come into contact with a convex portion 3b provided inside the vertical portion 3a of the seismic isolation floor 3. The limit switches 8 and 9 are arranged at the upper and lower limit positions of the seismic isolation floor 3, respectively, and depending on the relative positions of the pit floor 2 and the seismic isolation floor 3, they close their respective contacts and send a signal to the electric jack 5. Expand and contract. Then, the relative position of the seismic isolation floor 3 is automatically adjusted.

The seismic isolation floor 3 is desirably set so that approximately 90% of its weight is supported by the constant hanger 4 and the remaining approximately 10% is supported by the springs 6, respectively.

The constant hanger 4 is a known type used as a pipe support device, for example, a second
It is as shown in the figure. This constant hanger 4
A seismic isolation floor 3 is supported at one end of a rotating arm 10 via a link 11 and a bracket 12. The rotating arm 10 is pivotally attached to a frame 13, and on one side thereof, there are left and right connecting rods 10a of the arm 10.
and one end of a traction rod 14 is pivotally connected via an adjustment bolt 16. The other end of the traction rod 14 is
The arm 10 is locked to the end of the spring 15 and constantly biases the arm 10 to rotate in the direction of pulling up the seismic isolation floor 3. The supporting load or supporting force of the constant hanger 4 can be changed by turning the adjustment bolt 16 to change the pivot position of the traction rod 14 and by changing the length of the rotational moment arm.

In this seismic isolation floor device, the seismic isolation floor 3 is supported in a floating state against vibrations in the horizontal direction, so that vibrations are not transmitted to the seismic isolation floor 3. With respect to vertical vibrations, the constant hanger 4 that supports most of the load on the seismic isolation floor 3 maintains a constant supporting force even if the relative vertical position of the seismic isolation floor 3 changes. Therefore, no reaction force is generated against the seismic isolation floor 3.
Therefore, when the base isolation floor 3 is supported only by the constant hanger 4, if the base isolation floor 3 is displaced relative to the vertical direction, the base isolation floor 3 will remain in the same position after the displacement is completed. It will be done. In the case of this embodiment, a spring 6 with a weak supporting force is provided, but its reaction force is almost negligible, so that vibrations are not transmitted to the seismic isolation floor 3. When the load on the seismic isolation floor 3 changes and it is displaced upward or downward, this is controlled by the limit switches 8 and 9.
is sensed, expands and contracts the jack 5, and automatically adjusts the position of the seismic isolation floor 3. Fine adjustment to make the upper surfaces of the through holes 3c at the same level is performed using the adjustment bolts 16.

(Effect of the invention) In this invention, the seismic isolation floor 3 is suspended from the fixed floor 1 by the constant hanger 4, so even if the seismic isolation floor 3 is relatively displaced due to the vertical vibration of the fixed floor 1, there is a reaction against this. The force does not increase and vertical vibrations are not transmitted to the seismic isolation floor 3. The position of the seismic isolation floor 3 is sensed by the limit switches 8 and 9 and a signal is sent to the electric jack 5 to extend or contract it, so that the relative position of the seismic isolation floor 3 in the vertical direction can be automatically adjusted.

[Brief explanation of drawings]

FIG. 1 is a front view, and FIG. 2 is a sectional view of the constant hanger. 1...Fixed floor, 2...Pit floor, 3...Seismic isolation floor, 4...Constant hanger, 5...Electric jack, 6...Spring, 8, 9...Limit switch.

Claims (1)

[Scope of utility model registration request] The periphery of the seismic isolation floor is suspended from a fixed floor via constant hangers, and the pit floor is equipped with a limit switch that detects the upper and lower limits of the seismic isolation floor, and a limit switch located below the seismic isolation floor that detects the upper and lower limits of the seismic isolation floor. A seismic isolation floor device comprising an electric jack that ascends a predetermined distance in response to a lower limit signal and descends a predetermined distance in response to an upper limit signal, and a compression spring is interposed between the electric jack and the seismic isolation floor.