JP2511314B2 - Installation structure of coil spring for restoring force on base-isolated floor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an installation structure of a restoring force coil spring on a base-isolated floor.

(Prior Art) Conventionally, in this type of structure, as shown in FIGS. 5 and 6, the restoring force coil spring (a) is arranged in four directions on the floor surface (c) under the beam (b). It is arranged like a strip and has a trigger mechanism (d).

Thus, in order to activate the trigger, a beam orthogonal to the coil spring is provided, and a stopper is provided on the wire that pulls the coil spring. Then, in order to generate a trigger, a pre-tension is applied to the coil spring with a wire, and the position of the stopper is adjusted so that this force is always applied.

(Problems to be Solved by the Invention) In the above-described conventional structure, since the coil spring (a) is installed under the beam, the height of the seismic isolation floor is correspondingly increased, and the workability is also poor.

Also, since one coil spring is required for each direction,
A minimum of two coil springs, generally four, are required.

Furthermore, the initial rigidity of the seismic isolated floor will increase, and the response acceleration during a small earthquake will increase. (Refer to FIG. 8) By further installing a trigger device, noise due to friction is likely to occur.

The present invention has been proposed in view of the above problems of the prior art. The object of the present invention is to eliminate the directionality of the seismic isolation effect with a single coil spring and reduce the initial rigidity of the seismic isolation floor. The point is to provide the installation structure of the coil spring for restoring force in the seismically isolated floor.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the installation structure of a restoring force coil spring in a base-isolated floor according to the present invention has a restoring force coil horizontally arranged between beams in an upper floor. One end of the spring is fixed to the beam, one end of the wire is connected to the other end, the wire is bridged to the pulley installed on the floor, and the other end of the wire is laid on the floor. A ball ring mechanism is interposed between the anchor portion and the pulley to rotatably support the wire in all directions of 360 ° in a plane.

(Operation) Since the present invention is configured as described above, in the event of an earthquake, the wire is anchored to the same floor and horizontally to the upper floor via a wire that is bridged to the pulley. The restoring coil spring, which is arranged and fixed at one end to the beam, is tensioned to store energy, and after the earthquake ends, each member is restored to the old position.

Thus, the wire connected to the horizontal coil spring is laid over the pulley to change the direction from the horizontal direction to the vertical direction, and the wire can be freely rotated in all 360 ° in the plane by the ball ring mechanism. Since it is supported by a single coil spring, the coil spring effectively works in all the horizontal directions, and the directionality of the coil spring is lost.

Furthermore, since four coil springs have been used conventionally, only one coil spring is required, so the initial rigidity of the seismic isolation floor is small and the response acceleration to the earthquake is small.

(Examples) The present invention will be described below with reference to illustrated examples.

(1) is a steel frame beam made of H-shaped steel, (2) is a steel frame connecting beam, and one end of a horizontal coil spring (3) also serves as a tension adjusting member of the spring on the web of the steel frame beam (1). It is attached via a metal fitting (4), and a wire (5) is attached to the other end.

The wire (5) is bridged by a pulley (7) supported on a floor (6) through a support member (not shown) to change its direction by 90 °, and is supported on the floor (6) by a support (not shown). It is anchored to an anchor (9) fixed to the floor (6) via a ball ring (8) supported by a member.

The ball ring (8) is supported on the floor (6) and has a seat (8a) whose inner peripheral surface is formed into a spherical surface, and a spherical shape which is rotatably fitted to the seat (8a). A central hole (8c) is formed of a body (8b), and the inner peripheral surface of which is bulged in a spherical shape along the central axis of the spherical body (8b).

Since the illustrated embodiment is configured as described above,
During an earthquake, the seismic isolated floor (6) moves and the anchor (9) is the first
When moved to the positions shown in (9 ') and (9 ") of the figure, the wire (5) connected to the anchor (9) is pulled through the ball ring (8) and the pulley (7), The coil spring (3) is pulled to store energy.

At this time, the spherical body (8b) in which the wire (5) is inserted according to the displacement direction of the floor (6) slides along the spherical inner peripheral surface of the seat (8a). , The wire (5) can change its direction in all directions over the horizontal direction 360 ° of the floor (6), and the direction of the seismic isolation effect disappears, and the coil spring (3) makes it horizontal. A seismic isolation floor restoration mechanism is constructed that is effective in all directions.

Further, since the coil spring (3) is installed in the middle of the beam instead of being installed under the beam as in the conventional case, the floor height can be lowered. Further, in contrast to the conventional structure requiring at least two coil springs, generally four coil springs, in the above embodiment, only one coil spring (3) is required, and the initial rigidity is small, and the response at the time of a small earthquake The amount can be reduced.

Note that FIG. 7 is a stress diagram of the above-described embodiment showing the restoring characteristics, that is, the relationship of the forces for returning the deformed spring to the original state when the spring is deformed, and FIG. 8 is a comparative example. 6 is a stress diagram of a conventional structure.

As described above, in the conventional example, the initial rigidity becomes high as shown in FIG. 8 and the response acceleration at the time of a small earthquake becomes large, but in the above-mentioned embodiment, the initial rigidity becomes small as shown in FIG. The response acceleration to a small earthquake is small.

Even if tension is applied to the coil spring (3), the length between the floor anchor (9) and the spring-attached steel beam (1) does not change, and this serves as a trigger, and it is not necessary to provide a trigger device. It is not necessary to provide a beam or stopper for the trigger, and the friction noise generated by the trigger is eliminated.

(Effect of the invention) According to the present invention, as described above, one end of a restoring force coil spring horizontally arranged between beams on the floor is fixed to the beam, and the other end is connected to one end of the wire. Wear, and the wire is bridged over a pulley disposed on the floor to change the direction in the vertical direction, and the other end of the wire is anchored on the floor, and between the anchor portion and the pulley, a flat surface. By interposing the ball ring in which the wire is rotatably inserted in all directions of 360 °, the floor height can be suppressed lower than that of the conventional structure in which the coil spring is installed under the beam. Further, according to the present invention, the directionality of the seismic isolation effect can be eliminated by using only one coil spring, the initial rigidity can be reduced, and the response acceleration at the time of earthquake can be reduced.

Also, since it is not necessary to install a trigger mechanism,
The friction noise generated by the mechanism is eliminated.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an installation mechanism of a restoring coil spring in a base-isolated floor according to the present invention, FIG. 2 is a side view thereof, and FIGS. 3 and 4 are arrows of FIG. 1, respectively. View III-III as well as arrow IV-IV, FIGS. 5 and 6 are side views and a plan view, respectively, of the conventional structure, and FIGS. 7 and 8 are restoration characteristics of the present invention and the conventional example, respectively. FIG. (1) …… Steel beam, (3) …… Coil spring, (5) …… Wire, (6) …… Seismic isolation floor, (7) …… Pulley, (8) …… Ball ring, (9) ……anchor.

Claims (1)

(57) [Claims] 1. A coil spring for restoring force horizontally disposed between beams on the floor is fixed to the beam at one end, and one end of a wire is connected to the other end, and the wire is disposed on the floor. The wire is laid vertically on the pulley and the other end of the wire is anchored on the floor. An installation structure of a coil spring for restoring force in a base-isolated floor, which is characterized by being provided with a ball ring mechanism supported in a piercing manner.