JPH0745769B2 - Seismic isolation floor structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a base isolation floor structure against external vibration such as an earthquake of a building.

[Conventional technology]

To make the floor a seismic isolation structure, a movable part such as a floor panel is formed above the concrete floor that is the fixed part, and a seismic isolation mechanism such as a spring or bearing is installed between the movable part and the fixed part. , This supports the movable part.

In this case, when the earthquake occurs, the entire building shakes along with the ground surface and the concrete floor also vibrates, but seismic isolation mechanisms such as springs and bearings act to lengthen the cycle due to such external vibrations and reduce shaking. Therefore, the upper floor panel hardly vibrates.

By the way, in addition to horizontal vibration, vertical vibration is also a vibration caused by an earthquake, etc.
It is preferably dimensionally supported. A spring or the like is suitable for vertical seismic isolation, and a seismic isolation mechanism in which horizontal seismic isolation is mainly performed by a bearing and a coil spring is combined with this is also conceivable.

[Problems to be solved by the invention]

However, if an elastic body such as a spring is used in the vertical direction as the three-dimensional seismic isolation floor as described above, it is possible to run or carry luggage on the floor panel as a movable part and to load it during normal times other than an earthquake. Even if the value is changed, the floor panel moves up and down, which is extremely inconvenient.

An object of the present invention is to eliminate the inconvenience of the conventional example, and to provide a seismic isolation floor structure in which a movable part does not move vertically under normal load fluctuations other than an earthquake, but moves vertically only during an earthquake to enable vertical seismic isolation. To provide.

[Means for solving problems]

In order to achieve the above object, the present invention provides a seismic isolation floor structure in which a movable part is supported from a fixed part of the floor through a seismic isolation mechanism such as a spring and a bearing, and one end is axially mounted between the fixed part and the movable part. The gist of the present invention is to interpose a support rod that is in contact with the other end with a frictional force, and attach a tilting and returning means by a spring force to the support rod.

[Action]

According to the present invention, in a normal state without an earthquake or the like, the support rod is in an upright state between the movable portion and the fixed portion of the floor, and the support rod receives the load applied on the movable portion. It does not move up and down even if there is a change in.

On the other hand, when a horizontal force exceeding the frictional force is applied to the end of the support rod due to an earthquake, etc., the support rod is largely shaken around the shaft attachment point of the end, and the other end that is in contact with the friction force separates, so the movable part and the fixed part Is no longer connected, and the movable part is supported only by the seismic isolation mechanism, which also provides seismic isolation in the vertical direction.

Further, a spring force as a tilting and returning means acts on the support rod which is largely shaken and tilted, and the support rod automatically returns to the original upright state.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially cutaway front view showing a first embodiment of a base isolation floor structure of the present invention, in which 1 is a concrete floor as a fixed part, and 2 is a floor panel as a movable part provided above it. Reference numeral 3 denotes a joist supporting the floor panel 2 via the support legs 4, and in the present embodiment, the joist 3 is a section steel such as an H-section steel.

Although not shown, a seismic isolation mechanism such as a spring and a bearing is interposed between the joist 3 and the concrete floor 1, and the joist 3 and the floor panel 2 are movably supported on the concrete floor 1 by this seismic isolation mechanism.

Although various concrete examples of the seismic isolation mechanism are conceivable, as an example, a conical concave portion is formed on the floor 1, and a bearing made of a steel ball having a large diameter is rotatably disposed therein, and
An upper housing of the bearing has a support portion that is extendable and retractable and connected to a movable portion through a coil spring.

In this way, with respect to horizontal vibration during an earthquake, rolling on the conical recess of the bearing prolongs the vibration period and transmits it to the movable part, and vertical vibration is extended and contracted by the coil spring to move. It is transmitted to the club and three-dimensional seismic isolation is obtained. Further, an oil damper or a magnet damper may be provided in order to convert the vibration energy into heat or other energy to damp the vibration.

In the present invention, the support rod 5 is interposed between the joist 3 supported by the seismic isolation mechanism as described above and the concrete floor 1.

The support rod 5 comprises a shaft 6 and a jack bolt 7 screwed onto the tip of the shaft 6. The base end of the shaft 6 is connected to a link pole 8. The ball 9 of the link pole 8 is connected to the concrete floor 1 by a bolt 10. Boss with attached large nut
Center on 11. In the figure, 12 is a rubber cushion for mounting the boss 11, 13 is a nut for positioning the jack bolt 7, and 14
Is a nut for positioning the link pole 8.

A sleeve 15 is fitted on the outer periphery of the shaft 6 on the side of the shaft attachment portion, and the expanded end portion 15a of the sleeve 15 is brought into contact with the surface of the boss 11, and the other end of the sleeve 15 and the middle of the shaft 6 are provided. The coil spring 17 is wound around the outer circumference of the shaft 6 between the snap spring 16 and the snap ring 16 fixed to the collar. The sleeve 15 and the coil spring 17 serve as a means for tilting and returning the support rod 5 by a spring force as described later.

Next, usage and operation will be described.

As a set, the support rod 5 is set upright, and the jack bolt 7 is adjusted so that the head portion 7a thereof comes into contact with the lower surface of the joist 3 with a predetermined frictional force.

The nut 13 is used to fix the jack bolt 7 thus adjusted to the shaft 6.

In this way, the support rod 5 is vertically interposed between the concrete floor 1 and the joist 3, and even if a load W is applied to the floor panel 2, the support rod 5 receives this load W, so the floor panel 2 Does not move up and down.

On the other hand, a horizontal force α greater than the frictional force between the joist 3 and the head 7a of the jack bolt 7 due to a large external vibration due to an earthquake or the like.
When W is applied, the support rod 5 rotates around the ball 9 and falls down. As a result, the joist 3 is not supported by the support rod 5, and the joist 3 and the floor panel 2 can move up and down, so that the vertical seismic isolation is performed by the spring or the like as described above.

Further, when the support rod 5 falls down, the enlarged diameter end portion 15a of the sleeve 15 is pushed by the boss 11 and the sleeve 15 slides up with respect to the shaft 6, and as shown by the chain line in FIG. The sandwiched coil spring 17 is compressed. The compressed coil spring 17 is elastic and stretches in an attempt to return to its original state. Due to the action, the collapsed support rod 5 is restored to its original upright state at the same time as the earthquake is stopped.

FIG. 2 shows a second embodiment of the present invention, in which the shaft attachment portion of the support rod 5 is on the joist 3 side and the head portion 7a of the jack bolt 7 is in contact with the concrete floor 1 side.

Even in this case, the operation and effect are similar to those of the first embodiment, and the detailed invention of the operation is omitted, but in the case of this embodiment, the support rod 5 can be obtained like a pendulum by the displacement of the joist 3. Therefore, the coil spring 17 needs only a small elastic force to help the support rod 5 hang vertically under its own weight.

〔The invention's effect〕

As described above, the seismic isolated floor structure of the present invention is a seismic isolated floor structure in which a movable part is supported from a fixed part of the floor through a seismic isolation mechanism such as a spring or a bearing, and the movable part is a member for walking or luggage. Maintains a stable state without moving up and down due to load changes other than earthquakes such as transportation, and vertical seismic isolation is achieved because vertical support is possible due to the lack of support by support rods and vertical movement. It is what is done.

In addition, the support rods are automatically restored at the end of the earthquake and re-supported, which is convenient because it does not take time for setting.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the base isolation floor structure of the present invention, and FIG. 2 is a partially cutaway front view showing the same second embodiment. 1 ... Concrete floor, 2 ... Floor panel 3 ... Joist, 4 ... Support leg 5 ... Support rod, 6 ... Shaft 7 ... Jack bolt, 7a ... Head 8 ... Link pole 9 ... Ball, 10 ... Bolt 11 ... Boss, 12 … Buffer rubber 13,14… Nut, 15… Sleeve 15a… Expanded end, 16… Snap ring 17… Coil spring

Claims (1)

[Claims] 1. A seismic isolation floor structure in which a movable portion is supported from a fixed portion of the floor through a seismic isolation mechanism such as a spring or a bearing, and one end is axially attached between the fixed portion and the movable portion and the other end has a frictional force. A seismic isolation floor structure characterized by interposing a support rod that abuts with the support rod, and attaching tilting and returning means by spring force to the support rod.