JPH03166465A - Earthquate isolation removing device - Google Patents

Abstract

PURPOSE:To obtain a highly reliable earthquake isolation device causing no unnecessary frictional force by providing a function for horizontally movablly supporting a floor and a restoring force device for providing a restoring force to horizontal displacement between a floor body and a structure floor. CONSTITUTION:A restoring force device 4 is disposed opposite to one surface of the upper surface of a structural material 1 and the lower surface of a floor body 2. A pair of sliding members 5, 6 capable of sliding only in opposed directions, and a stopper for preventing the access of the sliding member provided on one surface into a fixed distance are formed. Lower bonding members 23 provided opposite to the pair of sliding members 5, 6, upper bonding members 28 engaged with mutually opposed surfaces on the other surface, and drawing springs 8, 9 laid between them are provided. Moving support mechanisms 3 rotating within the opposed surfaces of the upper bonding members 28 and the lower bonding members 23 are provided, and engaged in the state possible to slide.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Field of Industrial Application) The present invention relates to a seismic isolation device, and in particular, to a seismic isolation device that can expand the degree of freedom in design and construction and improve reliability. Regarding equipment.

(Prior Art) For example, electronic computers, emergency generators, dangerous materials (dynamite, chemicals, etc.), etc. must be operated or stored in a safe and sound condition even in the event of an earthquake. For this reason, there is a great deal of interest in the earthquake-resistant structure of places where such equipment or hazardous materials are installed.

By the way, as means for protecting structures and equipment against external vibrational forces caused by earthquakes, there are two methods: one employing a rigid structure method and the other employing a seismic isolation method.

In order to minimize the shaking of the structure, etc. when an external vibration force arrives, the rigid structure system is designed to make the structure itself rigid and increase its natural frequency to avoid resonance with the external vibration force. This is what I did. However, with this method, it is generally not possible to reduce the force applied to the structure or the like below the vibration external force, and there is also the problem that the cost of the structure increases.

On the other hand, those employing the seismic isolation method have a seismic isolation element, that is, an elastic body, interposed between the structure, etc. and its support base, thereby supporting the structure etc. flexibly. In general, systems that adopt this method lower the natural frequency of the vibration system consisting of seismic isolation elements and supporting structures to avoid resonance when external vibrational forces arrive. It has the advantage that the force applied to the structure etc. can be made sufficiently smaller than the vibration external force, and the structure can be realized at a relatively low cost.

9 to 12 show examples of conventional seismic isolation devices employing such a seismic isolation method. In other words, this seismic isolation device has a floor body 2 that is placed on a structural floor 1 and supports a seismically isolated object.
and a floor body 2 provided between this floor body 2 and the structural floor 1.
A movable support mechanism 3 that supports the structure movably in the horizontal direction is provided between the structural floor 1 and the floor body 2 so that restoring forces in two orthogonal directions can be obtained by the respective restoring forces, and the floor body 2 is displaced in the horizontal direction with respect to the structural floor 1, the floor body 2
A plurality of unidirectional restoring force type restoring force devices 4 that return the
It is equipped with. Each restoring force device 4 is provided with a pair of sliding members arranged oppositely on one of the upper surface of the structural floor 1 and the lower surface of the floor body 2, and slidably provided only in the opposite direction. 5.6, a stopper 7 provided on one surface to prevent the pair of sliding members 5.6 from approaching within a certain distance, and a pair of sliding members provided on the other surface of both surfaces. It consists of tension springs 8 and 9 stretched between 5 and 6. Further, a plate material I3 and a column I4 are provided between the structural floor 1 and the floor body 2 with balls 15 interposed therebetween.

With such a configuration, when no vibration external force is applied to the structural floor 1, the engaging member 62 protruding from the floor body 2 and each sliding member 5,6 as shown in FIG. The protruding wall 11 of is engaged with the stopper 7 via the buffer member l2, and the sliding members 5 and 6 are engaged with the stopper 7 by the restoring force of the tension springs 8 and 9. Therefore, the floor body 2 is held in the position shown in FIG. 13.

In this state, the arrow P in Fig. 14 is now on the structural floor 1.
When an external vibrational force in the direction shown is applied, the following operation is performed. That is, the floor body 2 is supported horizontally movably with respect to the structural floor 1 by a movable support mechanism, and the sliding member 5.6 of the restoring force device 4 is slidable outward from the stopper 7. Moreover, the floor body 2 side has a certain mass. Therefore, when the structural floor 1 is displaced in the direction indicated by the arrow P, the sliding member 6 located on the opposite side to the displacement direction is eventually moved by the floor body 2 to the opposite side to the displacement direction, as shown in the figure. It slides when pushed.

Therefore, the external force is not directly transmitted to the floor body 32, and the external force is stored as an extension of the tension springs 8 and 9. Therefore, the vibration external force transmitted to the floor body 2 is suppressed to a small value, and a good seismic isolation function is exhibited. When the external vibrational force subsides, the restoring force of the tension springs 8 and 9 automatically returns to the normal position shown in FIG. Such seismic isolation function and automatic return function are exerted in any horizontal direction because the restoring force device 4 is provided in such a manner that the restoring force acting direction lines thereof are orthogonal to each other. Further, since the restoring force device 4 is provided in the above relationship, the above function is exhibited even when a rotational force in the horizontal direction is applied.

As described above, since the support mechanism 3 that movably supports the floor body 2 is provided, and a plurality of the restoring force devices 4 of the above-mentioned structure are provided in the above-mentioned relationship, the floor body 2 can be easily resisted against vibrational external forces in any direction in the horizontal direction. The seismic isolation function and automatic return function can also be demonstrated in the rotational direction. In addition, the support mechanism 3 for movably supporting the floor body 2 and the restoring force device 4 are completely separated, and the restoring force device 4 is configured as a unidirectional restoring force type, which is necessary for seismic isolation. Furthermore, it is possible to downsize and reduce the height of these unit elements.

Therefore, without increasing the size of the building, it is possible to easily accommodate the area of the floor body 2 by simply increasing or decreasing the number of unit elements mentioned above, giving freedom in design and construction. can improve the degree of Moreover, even if one tension spring of each restoring force device 4 is broken in the above relationship, the overall seismic isolation performance will not be significantly affected. Therefore, reliability can also be improved.

(Problems to be Solved by the Invention) The conventional seismic isolation device configured in this manner has the following problems. That is, the buffer member 12 connecting the retaining member IO protruding from the floor body 2 and the protruding wall 1l of the sliding members 5 and 6 is a member for mitigating the impact in the operating direction of the sliding member 5.6. be. Therefore, the buffer member l2 is generally made of a material with excellent shock absorbing ability, such as rubber, and is coated with a fluororesin or the like.

Therefore, the structure is such that the frictional force generated in the direction orthogonal to the operating direction of the sliding members 5 and 6 can be controlled to some extent. However, since the frictional force is basically generated by surface contact and sliding friction, it is difficult to reduce the frictional force to a level that does not adversely affect the operation of the restoring force device 4.

It is also conceivable that the characteristics of the sliding surface may deteriorate (that is, the direction in which the frictional force increases) due to aging and repeated operations during earthquakes.

The present invention has been made in order to solve the above problem, and when a vibrational external force in the horizontal direction arrives through the foundation, a restoring force device that is effective in only one direction can be used to deflect the vibrational external force in any direction in the horizontal plane. To provide a seismic isolation device capable of absorbing vibration by changing and providing a plurality of seismic isolation devices, and improving reliability without generating unnecessary frictional force in a direction orthogonal to an effective direction by each restoring force device. There is a particular thing.

[Structure of the Invention] (Means for Solving the Problems) In the present invention, a floor body disposed on a structural floor and supporting a seismically isolated object, and a floor body provided between the floor body and the structural floor a support mechanism that supports the main body movably in the horizontal direction; and a support mechanism that is provided between the structural floor and the floor main body and applies a restoring force to the floor main body when the floor main body is displaced in the horizontal direction with respect to the structural floor. and a restoring force device, the restoring force device being disposed opposite to each other on one of both surfaces of the upper surface of the structural floor and the lower surface of the floor body, and provided slidably only in the opposing direction. a pair of sliding members, a stopper provided on the one surface to prevent the pair of sliding members from approaching within a certain distance, and a stopper provided opposite to each other on the pair of sliding members. Consisting of a lower engaging member, an upper engaging member provided on the other surface and engaging with mutually opposing surfaces of the pair of lower engaging members, and a tension spring stretched between the pair of sliding members. The upper engaging member and the lower engaging member are slidably engaged with each other via a rotating member that rotates within opposing surfaces.

Further, it is characterized in that the pair of upper engagement member and lower engagement member are slidable in the horizontal and vertical directions within opposing surfaces via a rotating member.

(Function) According to the seismic isolation device according to the first embodiment, when the structural floor vibrates in the horizontal direction due to an external force, the displacement of the structural floor among the pair of sliding members constituting each restoring force device A sliding member located on the opposite side receives the inertial force of the floor body and slides in a direction that extends the tension spring. Therefore, the vibration force applied to the floor body can be suppressed to a small value, resulting in a good seismic isolation function. When the vibration external force is removed, the floor body is automatically returned to its original position by the restoring force of the tension spring. Therefore, it also exhibits a good automatic return function. Since each restoring force device is provided in the above-mentioned relationship, such a function is exerted against all horizontal external vibrational forces and rotational forces. In addition, by making the upper engaging member and the lower engaging member slidable in the horizontal direction within the mutually opposing surfaces, unnecessary frictional force is not generated in the horizontal direction other than the operating direction of the restoring force. It is possible to increase the reliability of the device.

In addition, according to the seismic isolation device according to the second embodiment, unnecessary frictional force is not generated in the horizontal and vertical directions perpendicular to the operating direction of the restoring force device, so if a relative displacement occurs in the vertical direction, However, by avoiding the frictional force caused by this, it is possible to further improve reliability.

It should be noted that there are other features found in conventional seismic isolation devices, such as smaller and lighter unit elements, reduced height, greater freedom in design and construction, and overall reliability of the seismic isolation device when cutting tension springs. The present invention does not impair the security of properties and the like.

(Example) An example of a seismic isolation device according to the present invention will be described with reference to the drawings.

FIG. 1 shows a partially cutaway side view of a seismic isolation device according to a first embodiment of the present invention, and FIG. 2 shows a partially cutaway plan view of the same device.

This device is broadly divided into a floor body 2 that is placed above a structural floor 1 such as a building foundation or slab and supports a seismically isolated object, and a floor body 2 that is installed between this floor body 2 and the structural floor 1. a plurality of movable support mechanisms 3 that support movably in the horizontal direction, and a plurality of unidirectional restoring mechanisms provided between the structural floor 1 and the floor body 2 so as to obtain restoring forces in two directions perpendicular to each other. It is composed of a force-type restoring device 4.

As shown in FIG. 2, the plurality of moving support mechanisms 33 are arranged at appropriate intervals in the horizontal direction, and are opposed to a flat plate l3 fixed to the upper surface of the structural floor 1 and to the plate l3 on the lower surface of the floor body 2. It is composed of pillars l4 protruding from respective positions, and balls 15 respectively inserted between these pillars 14 and the plate l3.

On the other hand, in this embodiment, two restoring force devices 4 are arranged adjacent to each other at each of the four corners of the floor body 2 so that their center lines are perpendicular to each other.

Each restoring force device 4 is specifically constructed as shown in FIGS. 3 and 4.

That is, an elongated base plate 22 is fixed to the upper surface of the structural floor 1, and guide mechanisms 16 are installed at both ends of the upper surface of the base plate 22.
, IT is fixed coaxially. Guide mechanism 16.
Reference numeral 17 denotes a pair of guide members 18 whose cross section is shaped like a crank. 19 in parallel. Guide mechanism 16. 17 have sliding members 5.6 facing each other and a guide mechanism 16. 17 and is slidably mounted on the base plate 22 in the longitudinal direction along the same line.

In this embodiment, the sliding member 5.6 has both ends connected to the guide member 18.6. 19 and the base plate 22, a plate-shaped part 20 formed in a size that can be fitted into the guide hole formed between the base plate 22, a lower engaging part 23 provided on the upper surface of this plate-shaped part 20, and the base plate The support protrusion 21 is provided on the upper end edge of the plate-shaped portion 20 located on the center side of the plate portion 22 . As shown in FIGS. 5 and 6, the lower engaging member 23 is composed of a shaft 24, a bearing 25, a roller 26, and a base 27 for fixing these to the plate portion 20. The sliding members 5.6 configured as described above are prevented from approaching within a certain distance from each other by a stopper 7 fixed to the upper surface of the base plate 22. However,
Coiled tension springs 8 and 9 are stretched horizontally between the protrusions 21 of the sliding members 5 and 6 via a length adjustment mechanism (not shown) such as a turnbuckle. As shown in FIG. 3, upper engaging members 28 that engage with the lower engaging members 23 of the respective sliding members 5 and 6 are protruded from the lower surface of the floor body 2. As shown in FIG. The upper engaging member 28 is provided with a rubber lining (not shown) to provide a buffering function. Note that the upper engaging member 28 is connected to the upper engaging member 2 as shown in FIG.
8. The width corresponds to the displacement in the direction perpendicular to 8.

Each restoring device [4 configured as described above is arranged with its direction changed so as to have a restoring force in an arbitrary direction within a horizontal plane. With such a configuration, the operation of the seismic isolation device according to the present invention is similar to that of the conventional technology. That is, the protruding wall 1l and the buffer member l2 in the conventional technology
and the lower engaging member 23 and the engaging member 10 and the upper engaging member 2
You can read it as 8.

Furthermore, in this embodiment, the upper engaging member 28 and the lower engaging member 23 are directly engaged by line contact between the upper engaging member 28 and the roller 26, and the form of friction is rolling friction, so the frictional force is is significantly reduced, the unidirectionality of the restoring force device can be made more reliable, and the reliability of the entire seismic isolation device can be increased.

Further, in the case of the seismic isolation device according to the second embodiment, the basic configuration is the same as that of the first embodiment, and the only difference is the lower engaging member 23 shown in FIG. 7.

The lower engaging member 23 consists of a protruding wall 11 provided on the base plate 22, a ball 29, and a ball support 30, and the rotation direction of the ball 29 is the same as that of the upper engaging member 28 and the lower engaging member 2.
3. Any direction within the facing plane. In the case of this embodiment, in the vertical direction, the movable support mechanism 3 supports its own weight and the vertical seismic force, and its arrangement induces a rotational movement in the floor body 2 in a plane including the vertical direction, that is, a rocking movement. Although there is a very small possibility that the rocking movement will occur, even if there is a relative movement in the vertical direction due to rocking movement,
It becomes possible to avoid the frictional force caused by this, and it is possible to improve the reliability of the device more than in the first embodiment.

Note that the present invention is not limited to the embodiments described above; for example, dampers may be arranged in parallel to the tension springs 8, 9,
It is also possible to provide a seismic isolation device with even better seismic isolation performance by imparting damping characteristics.

Further, although rotating bodies such as rollers and balls are arranged in the lower engaging member, it is also possible to arrange these rotating bodies in the upper engaging member, and the seismic isolation performance does not change even in this case.

In this case, it is also possible to provide one sliding member with a plurality of rotating bodies such as rollers and balls.

Furthermore, other structures having similar functions can be considered for the structure of the lower engaging member 23. For example, as shown in FIG. 31, a wheel 32 supported by the axle support 31 and capable of sliding horizontally within a surface facing the upper engagement member 28 and the lower engagement member 23, and an axle 3 supporting the wheel 32;
By providing the lower engaging member 23 consisting of the first
The same effect as the seismic isolation device according to the embodiment can be obtained.

[Effects of the Invention] According to the present invention, unnecessary frictional force is not generated in the horizontal direction other than the operating direction of the restoring force, and excellent automatic return function and seismic isolation function are exhibited to improve the reliability of the device. can do.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a first embodiment of the seismic isolation device according to the present invention, and Fig. 2 is a view cut along line A-A in Fig. 1 and viewed in the direction of the arrow. , Fig. 3 is a vertical cross-sectional view of the main part of the restoring force device incorporated in the seismic isolation device, Fig. 4 is a plan view of the main part of the restoring force device, and Fig. 5 is a longitudinal sectional view of the main part of the restoring force device incorporated in the seismic isolation device according to the present invention. FIG. 6 is a longitudinal cross-sectional view showing the vicinity of the lower engaging member of the restoring force device, FIG. 6 is a view taken along line B-B in FIG. FIG. 9 is a partially cutaway perspective view of a restoring force device incorporated in a seismic isolation device according to a second embodiment of the invention; FIG. 9 is a partially cutaway side view of a conventional seismic isolation device; The same seismic isolation device was installed on the 9th
A diagram cut along the line C-C in the figure and viewed in the direction of the arrow,
Fig. 11 is a sectional view of the restoring force device incorporated in the seismic isolation device, Fig. 12 is a plan view of the main parts of the restoring force device, and Figs. 13 and 14 explain the operation of the seismic isolation device. This is a diagram for 1... Structural floor 2... Floor body 3... Moving support mechanism 4... Restoring force device 5, 6... Sliding member 7... Stopper 8, 9... Tension spring 0. ... Engagement member 1 ... Projection wall 2 ... Buffer member 3 ... Plate material 4 ... Column 5 ... Ball 6.17 ... Guide mechanism 8, 19 ... Guide member 20 ... Plate-shaped portion 2l ... Protrusion 22 ... Base plate 23 ... Lower engaging member 24 ... Shaft 25 ... Bearing 26 ... Roller 27 ... Base 28 ... Upper part Engaging member 29...Ball 30...Ball support 3l...Axle support 32...Wheel 33...Axle (8733) Agent: Yoshiaki Inomata, patent attorney (and others)
1 person) Recruitment 1 Ken-Kaya 2 Showa 3 Dencha 4 Ranchaq Enki IO Akane P Tei 14 Figure

Claims (1)

[Claims] a floor body disposed on a structural floor to support a seismically isolated object; a support mechanism provided between the floor body and the structural floor to support the floor body movably in the horizontal direction; and a restoring force device that is provided between the floor body and provides a restoring force to the floor body when the floor body is displaced in a horizontal direction with respect to the structural floor, and the restoring force device is provided on the upper surface of the structural floor. and a lower surface of the floor body, the pair of sliding members being disposed opposite to each other and slidably only in the opposing direction; a stopper that prevents the sliding members from approaching within a certain distance; a lower engaging member provided on the pair of sliding members facing each other; and a lower engaging member provided on the other surface of the pair of lower engaging members. It is composed of an upper engaging member that engages with mutually opposing surfaces of the members, and a tension spring that is stretched between the pair of sliding members, and the upper engaging member and the lower engaging member rotate within the opposing surfaces. A seismic isolation device characterized in that the seismic isolation device is slidably engaged with a rotating member.