JPH0941495A - Base isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize structure and facilitate fitting to a structure regarding a base isolating device applied to the floor or the like of the structure. SOLUTION: A structure side support 10 and a ground side support 11 are respectively of a portal shape and formed into an integrally rigid state respectively consisting of four parallel leg parts 10a, 11a and cross beams 10b, 11b connecting one end of each leg part in portal shape. These supports 10, 11 are fitted in a contactless and vertically inverse state, and the center parts of opposed cross beams 10b, 11b are connected to each other by a pendulum type suspension member 12 formed of wire or a steel bar of 1m or more in length. An energy absorber (unillustrated) is provided between the structure side cross beam 10b and the ground side, at a right angle within a horizontal plane. The vibration of the ground is transmitted in a reduced state to the structure, and horizontal vibration is absorbed by the energy absorber. This device is compact in constitution and easy to fit.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a seismic isolation device applied to a floor of a structure or the like.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional floor seismic isolation device. In the figure, (a) is a layout of the seismic isolation device, and (b) is a side view. As shown in (a), the seismic isolation devices are installed in plural places 02 around the structure 01, and each seismic isolation device is (b).
As shown in, the flexible slab 05 made of laminated rubber or laminated rubber having lead plugs enclosed therein is directly interposed between the basic slab 03 and the floor slab 04 of the structure 01 to form the basic slab. Structures have been used that support structure 01 on 03 and absorb the seismic energy by shear deformation of these plurality of flexible bearings 05. In this seismic isolation structure, the vibration external force directly acts on the flexible bearing 05. Therefore, if the vibration damping in the flexible bearing 05 is not sufficient, the external force that cannot be stopped is the floor 04.
However, there is a problem that the seismic isolation effect cannot be expected and the horizontal displacement is limited.

Further, a seismic isolation device shown in FIG. 8 has been proposed as an improvement of the conventional structure. This device is shown in FIG.
As shown in Fig. 1, the circular pipe 07 is rigidly provided on the ground 06 side, and the I-shaped bearing 0 is made to project from the lower surface of the structure 01.
9 is provided and the support 09 is inserted into the circular pipe 07 in a non-contact manner, the top part 07a of the circular pipe 07 and the lower flange 09a of the support 09 are connected by a plurality of pendulum wires 010 to form the structure 01. An energy absorbing device 011 is provided between the suspension, the structure 01 or the bearing 09, and the rigid portion of the ground 06, that is, the inner surface 08 of the circular pipe 07.

Further, as shown in FIG. 8 (b), the bearing 09 is inserted into the space between a plurality of piles 012 provided on the ground 06 side at regular intervals without contact, and the head of the pile 012 is inserted. And the lower flange 09a of the support 09 to a plurality of pendulum wires 0
An energy absorbing device 011 is provided between the lower end of the support 09 and the side surface of the pile 012.

[0005]

However, in the conventional device shown in FIG. 8 (a), the periphery of the bearing 09 of the structure 01 is provided with a plurality of portions from the top portion 07a of the circular pipe 07 which is a rigid portion on the ground 06 side. Since it is supported by the pendulum wire 010, and in the device shown in FIG. 8 (b), the periphery of the support 09 is supported by the plurality of pendulum wires 010 from the head of the pile 012, the seismic external force generated on the ground 06 side is Structure 01 and pendulum wire 01
Horizontal vibration is performed in a cycle of 0 to reduce the vibration to the structure 01 through the buffering action of the energy absorbing device 011.
Further, a plurality of pendulum wires 010 around the support 09 stabilize the structure 01 and only move it horizontally.

However, in such a conventional apparatus, particularly in the apparatus having the configuration shown in FIG. 8B, the reaction cannot sufficiently allow the bending force of the pile 08, and the seismic isolation effect is reduced.

The conventional devices shown in (a) and (b) are:
Since the circular pipe 07 or the stake 012 is provided so as to surround the bearing 09 and keep the space therebetween, the whole structure of the bearing portion becomes large in size, which makes it difficult to install.

In order to solve the above problems, it is an object of the present invention to reduce the size of a bearing structure of this type to facilitate its installation, and to eliminate the need for a double slab when installing the apparatus so that it can be installed on the pile head. And

[0009]

To achieve this object, in the present invention, at least three or more leg portions are used for the rigid portion of the ground and the bottom portion of the structure, and each leg end is connected to the ground side and A multi-legged gate-shaped frame fixed to the floor side of the structure and connected to the other end with a connecting beam to form a gate-shaped ground side and structure side, and both of these multi-legged gate frames can be moved upside down. In combination, the upper and lower facing connecting beams of both multi-legged frames are connected horizontally with a pendulum type suspension member so that horizontal swing is possible, and the structure is constructed with a pendulum type suspension member with the rigid part of the ground as a fulcrum. The seismic isolation device is such that the bottom part is suspended and an energy absorbing device is also provided between the rigid part of the ground and the bottom part of the structure. Furthermore, in this seismic isolation device,
A structure in which the pendulum type suspension member is in the shape of a single rod is also provided.

That is, according to the present invention, (1) one end of at least three legs is fixed to a rigid portion of the ground, and the other ends of the legs are connected by connecting beams to form a gate shape. A ground-side multi-legged portal frame; and at least three legs arranged in parallel with each leg of the ground-sided multi-legged portal frame, one end of which is the structure bottom It is fixed to the side and the other end is connected by a connecting beam to form a multi-leg gate type, and the structure side multi-leg gate type that is movably combined with the ground side multi-leg gate type frame in an upside down manner. A frame; a pendulum type suspension member which is connected between the central portions of both connecting beams, which are vertically opposed to each other in the multi-leg gate type frame, and which supports the structure by suspending it horizontally, and a rigid portion of the ground And an energy absorbing device connected between the structure and the bottom of the structure. To provide a seismic isolation system.

(2) Further, in the seismic isolation device of the above (1), the pendulum type suspension member is composed of one rod-shaped member having rounded ends, and a seat is provided at the center of both the connecting beams. We also provide seismic isolation devices that are characterized by being connected together.

In the invention (1) of the present invention, the support of the multi-leg gate type frame on the structure side and the support of the multi-leg gate type frame on the ground side are turned upside down on the common axis and the leg portion side. It is possible to arrange the legs so that they are lined up at equal intervals in the circumferential direction by non-contact fitting, and each leg end is rigidly joined to the structure side and the rigid part side of the ground by welding etc. Installed. Therefore, the volume occupied by the entire bearings on the structure side and the ground side is significantly reduced and the size is reduced.

Further, the external vibration force generated on the ground side is transmitted to the structure side through the pendulum type suspension member connected between the central portions of the connecting beams facing each other of the two sets of multi-leg gate type frame bearings, and is transmitted to the structure side. When a horizontal vibration occurs, the vibration period on the structure side is lengthened, and the horizontal vibration entering the structure is weakened via the energy absorbing device.

If the pendulum type suspension member is constructed and provided to have a length of 1 m or more, the vibration frequency on the structure side is separated from the expected period of the seismic force, and both the energy absorbing device and the pendulum action act. Vibration can be efficiently reduced.

In this way, the seismic isolation device is compared with a conventional device using a pendulum wire provided with circular pipes or piles,
The size can be reduced, and thus it can be easily mounted and installed between the pile top end or pillar top end of the ground and the pillar bottom end of the structure.

Further, in the invention of (2), since the pendulum type suspension member has the same action and effect as the above-mentioned (1) and has a single rod shape, it can be processed by, for example, a steel rod. Compared with a suspension member composed of a plurality of wires, the processing is easier, the number of members is reduced, and the seismic isolation device becomes compact.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a perspective view of a seismic isolation device according to a first embodiment of the present invention, and shows a structure of a structure side bearing and a ground side bearing. In FIG. 1, 10 is a bearing on the structure 1 side, and 11 is a bearing on the ground 2 side. Structure 1
The side bearing 10 and the ground 2 side bearing 11 are each formed in a gate shape, and each have four parallel leg portions 10a and 11a.
a and the cross beams 10b and 11b in which one ends of the leg portions 10a and 11a are connected in a gate shape are integrally and rigidly configured.

The bearings 10 and 11 are fitted upside down and in parallel with each other in a non-contact manner so as to be aligned on the same axis from the leg side, and a total of eight leg portions 10a, 11a are arranged at equal intervals. A pendulum type suspension member 12 such as a wire or a steel rod having an effective length of 1 m or more is provided between the central portions of the cross beams 10b and 11b which are vertically opposed to each other in a state of being aligned on the circumference or concentrically.
Connect with. One or more pendulum type suspension members 12 are provided in parallel and close to each other.

FIG. 2 is a side view showing a state in which the bearings 10 and 11 are mounted between the structure 1 and a rigid portion on the ground side 2, for example, the upper end of the pile 3. The support 10 is attached by fixing the ends of the legs 10a to the lower surface of the structure by welding or the like, and the other support 11 is fixed by attaching the ends of the legs 11a to the pile 3 of the ground by welding or the like.

Numeral 13 is between the connecting member 14 on the lower surface of the cross beam 10b of the support 10 fixed to the structure 1 side and the connecting member 15 on the upper end of the pile 3 although not shown in the drawing, but is perpendicular to the horizontal plane 2
The energy absorption device is arranged in a direction and connected to the energy absorption device. Similar supporting portions are provided at a plurality of peripheral portions between the structure 1 side and the pile 3 side.

The operation of the seismic isolation device having such a configuration will be described with reference to FIG. In FIG. 2, the structure 1 includes a cross beam 11 of a bearing 11 provided on the pile 3 at a plurality of peripheral portions.
b and the cross beam 10 of the support 10 provided in the lower part of the structure 1.
The pendulum type suspension member 12 connecting between b is suspended and supported with the center of the upper end of the support 11 on the pile 3 side as a fulcrum.

That is, two sets of bearings 10 and 11 of a multi-leg gate type frame having the same shape are fitted upside down in a non-contact manner on the same axis from the leg side, and a cross beam at the center thereof. 10
Since b and 11b are connected by the pendulum type suspension member 12,
The structure of the entire bearing part is significantly simplified and compact,
It can be easily installed on the pile 3.

In this state, when the ground 2 side is vibrated and the ground 2 is vibrated, the horizontal vibration of the pile 3 is transmitted from the support 11 on the pile 3 side through the pendulum type suspension member 12 to the structure 1
It is transmitted to the side bearing 10 and vibrates the structure 1 in the same direction.

At this time, the vibration energy entering the structure 1 changes the vibration period of the structure 1 to 2 seconds or more by setting the suspension length of the support 11 and the support 10 to 1 m or more, and It is reduced by the action of the energy absorbing device 13 provided between the lower part of the cross beam 10b of 10 and the head of the pile 3.

Further, the pendulum type suspension member 12 is attached to the support 11
And since it is provided centrally in the center of the bearing 10 and transmits the vibration energy, it absorbs the bending force against the deformation of the pile 3,
The bending force applied to the head of the pile 3 is significantly reduced.

FIG. 3 is a side view of the seismic isolation device according to the second embodiment of the present invention. The second form is a structure in which a seismic isolation device similar to that of the first form is provided between a pillar 4 on the ground 2 side and a pillar 1a which is fixed to the structure 1 side and supports this, and other structures are the same. It is the same as the first embodiment. Therefore, its action and effect are the same as those of the first embodiment.

FIG. 4 is a side view of the seismic isolation device according to the third embodiment of the present invention. This 3rd form has the same base isolation device as the 1st form, and the foundation slab 5 formed on pile 3 and structure 1
It is a configuration installed between the lower end and the lower end. Therefore, the energy absorbing device 13 is provided between the lower end portion of the structure 1 and the side wall portion of the foundation slab 5, and other configurations are the same as those in the first embodiment.

The seismic isolation device of the third embodiment is based on the foundation slab 5
And the floor slab or pillar of the structure 1 can be provided, and can be easily installed regardless of the shapes of the foundation and the structure. Other operational effects are similar to those of the first embodiment.

FIG. 5 is a perspective view of a seismic isolation device according to the fourth embodiment of the present invention. In the fourth mode, the support 20 on the structure 1 side and the support 21 on the ground 2 side are respectively connected to three symmetrical and parallel leg portions 20a and 21b, and one end side of these leg portions are connected in a gate shape. The cross beams 20b and 21b are configured into a multi-legged gate-shaped frame, and the central portions of the cross beams 20b and 21b are connected by the pendulum type suspension member 12 such as the wire or the steel rod.

According to the fourth mode, the structure of each of the bearings 20 and 21 is made up of three lines as compared with the structures of the first to third modes, so that it becomes simpler. Other functions and effects are similar to those of the first embodiment.

FIG. 6 is a side view of the seismic isolation device according to the fifth embodiment of the present invention. In this fifth mode, the pendulum type suspension member 12 of the first and fourth modes is used as a steel rod type pendulum type suspension member 22 by using a steel rod with rounded ends instead of wires.
Cross beams 10b, 11 of bearings 10, 11 or 20, 21
The structure is such that the pendulum action is performed by sliding it between a spherical seat provided at the center of b or 20b, 21b.

According to the fifth aspect, the number of members of the pendulum type suspension member 22 is reduced, the suspension portion is made more compact, and the tolerance for bending the pile is improved. Other actions and effects are similar to those of the first embodiment.

[0033]

As described above in detail, the seismic isolation device of the present invention, in short, uses at least three leg portions for the rigid portion of the ground and the bottom portion of the structure, and uses each leg end. It is fixed to the ground side and the floor side of the structure, and the other end is connected by a connecting beam to form a gate-shaped multi-sided gate type frame side and structure side. In the pendulum type suspension member with the rigid part of the ground as a fulcrum, the center part of the connecting beams facing each other vertically on both multi-leg gate frames is connected so that horizontal swing is possible with the pendulum type suspension member. The bottom of the structure is hung, and further, an energy absorbing device is provided between the rigid part of the ground and the bottom of the structure. Furthermore, in this seismic isolation device,
Since the pendulum type suspension member is also provided in the shape of a single rod, the following effects are achieved.

(1) The structure of the support portion of this type is remarkably miniaturized to facilitate the application and mounting to the structure, eliminate the bending force applied to the pile head when the pile head is used as a fulcrum, and provide a seismic isolation effect. It has the effect of increasing the.

(2) By forming the pendulum type suspension member into a single rod shape, the pendulum type suspension member can be easily processed,
The number of members is reduced and the seismic isolation device can be easily assembled and attached to the structure.

[Brief description of drawings]

FIG. 1 is a perspective view of a seismic isolation device according to a first embodiment of the present invention.

FIG. 2 is a side view showing a mounted state of the seismic isolation device according to the first embodiment of the present invention.

FIG. 3 is a side view showing an attached state of the seismic isolation device according to the second embodiment of the present invention.

FIG. 4 is a side view showing a mounted state of a seismic isolation device according to a third embodiment of the present invention.

FIG. 5 is a perspective view of a seismic isolation device according to a fourth embodiment of the present invention.

FIG. 6 is a side view of a seismic isolation device according to a fifth embodiment of the present invention.

7A and 7B are diagrams of a conventional seismic isolation device, in which FIG. 7A is a layout diagram of mounting and FIG. 7B is a side view of the seismic isolation device.

FIG. 8 is a side view of a conventional improved seismic isolation device, in which (a) is an example where a circular pipe is used and (b) is an example where a pile is used.

[Explanation of symbols]

1 Structure 2 Ground 3 Piles 4 Ground-side pillars 5 Foundation slabs 10, 20 Structure-side support (multi-legged frame) 10a, 11a, 20a, 21a Legs 10b, 11b, 20b, 21b Cross beams 11, 21 Ground-side support (multi-leg gate frame) 12 Pendulum type suspension member 13 Energy absorption device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideaki Harada, 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Motoyuki Fujii 4-22, Kannon Shinmachi, Nishi-ku, Hiroshima Mitsubishi Heavy Industries Ltd. Hiroshima Research Center

Claims (2)

[Claims] 1. A ground-side multi-leg gate type in which one end of at least three legs is fixed to a rigid portion of the ground, and the other ends of the legs are connected by connecting beams to form a gate shape. With a frame;
It has at least three legs arranged in parallel with each leg of the ground-side multi-legged portal frame. One end of the leg is fixed to the bottom of the structure and the other end is a connecting beam. And a structure-side multi-leg portal frame, which is connected to each other to form a multi-leg portal, and is movably combined with the ground-side multi-leg portal frame so as to be opposite to each other; A pendulum type suspension member which is connected between the central portions of both connection beams facing each other vertically and supports the structure by suspending the structure horizontally.
A seismic isolation device comprising: an energy absorbing device connected between a rigid portion of the ground and a bottom portion of the structure. 2. The pendulum type suspension member is composed of a single rod-shaped member having rounded ends, and a connecting face is provided at the center of each of the connecting beams for connection. Seismic device.