JP2000054506A - Uplift prevention device for base isolated building and base isolated construction for light-weight building provided therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an uplift prevention device for base isolated building and a base isolated construction for a light-weight building provided with the device. SOLUTION: An uplift prevention device is used for a base isolation structure preventing an earthquake by a base isolation device 30, and it is equipped with upper side fixed metal fittings 2 fixed to a sill W and lower side fixing metal fittings 3 fixed to the ground. First impact absorption members 6 and 7 are fixed to at least either the insides of one and the other upper side fixed sections 2a and 2b or both sides a lower side horizontal section 3c, and second impact absorption members are fixed to the insides, etc., of one and the other lower side fixed sections. A plurality of layers having different hardness are laminated on the first and/or second impact absorption members 6 and 7, distance, etc., from the insides of the first impact absorption members 6 and 7 to both sides of the lower side horizontal section 3c are slightly shorter than the approximately half of the length of the maximum amplitude stroke in the earthquake preventing the earthquake by the base isolation device 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing a seismic isolation structure from being lifted to prevent the seismic isolation structure from adopting a seismic isolation structure for protecting the building from vibrations caused by an earthquake. The present invention relates to a seismic isolation structure for a light weight structure.

[0002]

2. Description of the Related Art As is well known, as a conventional seismic isolation device for protecting a building from vibrations caused by an earthquake, (1) a structure in which an upper structure is supported from below by a laminated rubber in which rubber and iron plates are alternately stacked. (Laminated rubber seismic isolation) or (2) vibrations due to earthquakes absorbed by damper device, (3)
Insulation between the ground and the superstructure has been proposed. For example, as the insulation method of the above (3), a method of floating a structure by liquid or magnetism, a method of sliding the ground and an upper structure (sliding bearing or sliding seismic isolation),
Alternatively, rolling bearings such as roll bearings (roller seismic isolation) have been proposed, and some of them have been put to practical use. Further, as a conventional seismic isolation device or seismic isolation structure, a device in which the above-described device or structure of (1) and the device or structure of (3) are used in combination has been proposed. Therefore, by adopting these seismic isolation devices or seismic isolation structures, it is possible to protect buildings or structures from earthquake vibrations and to avoid damage due to earthquakes.

[0003]

The research and development of such seismic isolation devices or seismic isolation structures have been rapidly promoted by major construction companies in recent years, and some of them have been put into practical use. Most of them are for heavy objects such as buildings, and very few consider seismic isolation for light-weight structures such as detached houses. Therefore, when considering the seismic isolation device or structure for light-weight structures such as detached houses, the above-mentioned (1) laminated rubber seismic isolation is conceivable, but sufficient for light-weight buildings. It is currently difficult to ensure seismic isolation performance. From this, it is effective to use the insulation method of the above (3), especially the structure using the above-mentioned sliding seismic isolation or roller seismic isolation as a seismic isolation for light-weight buildings.

[0004] However, in the case of such seismic isolation or roller seismic isolation, when a large wind pressure acts on a structure due to a typhoon or the like, there is a risk that the structure may rise and fall over. For example, when roller seismic isolation is adopted, a sphere is placed on a lower support plate fixed to the ground side, and an upper support plate fixed to the lower surface of the base is supported on the sphere. Therefore, when a strong wind pressure such as a typhoon acts on the structure, there is a risk that the structure may be lifted. In particular, as the height from the ground is higher, such as a three-story structure, there is a possibility that the structure will be lifted by such wind pressure, and if a larger wind pressure acts on the structure, the structure may fall. Further, the possibility of floating due to the wind pressure is the same even when the (1) seismic isolation structure that supports the upper structure from below by the laminated rubber isolation is used.

[0005] On the other hand, even when each seismic isolation device or seismic isolation structure described above is adopted, it is practically impossible to provide a structure that can cope with any scale or degree of earthquake. . For example, in the case of a seismic isolation device or a seismic isolation structure using the so-called laminated rubber of the above (1),
The extent to which the relative displacement length between the ground side and the structure side due to an earthquake is allowed (maximum allowable range) is a matter to be determined naturally in design. In addition, the area of the upper surface or the lower surface of the member forming the sliding surface to be determined in the case of employing the seismic isolation device or the seismic isolation structure referred to as the above-mentioned so-called sliding bearing or sliding seismic isolation is when the amplitude stroke is long. However, if the seismic isolation function is always expected to be effective effectively, it is theoretically sufficient to use an area corresponding to it, but the site area of the building is usually limited, and the house, fence, etc. Considering the distance from the structure, it is virtually impossible to make the area unlimitedly large. This is the same even when the above-described seismic isolation device or structure called roller seismic isolation is adopted, and the lower support plate fixed to the ground side or the upper support plate fixed to the structure side is also used. Making the area unlimitedly large is practically impossible even in view of cost. Therefore, the seismic isolation device or seismic isolation structure that is specifically adopted sets a certain range or limit for the seismically separable amplitude stroke, depending on the site area of the building to be constructed or the environment such as surrounding structures. If an earthquake with an amplitude stroke exceeding the range or limit occurs,
A structure or device for avoiding a situation in which the seismic isolation device is destroyed, or the upper structure previously supported cannot be supported, and only the upper structure falls off a predetermined member. (A technique having a so-called fail-safe function is required).

In view of this, a structure having a fail-safe function is provided in such a manner that a predetermined range or limit is provided for the seismically separable amplitude stroke and an earthquake having an amplitude stroke exceeding the range or the limit occurs. There has been proposed a seismic isolation device provided with such a device or a device provided with such a fail-safe function separately from the seismic isolation device. For example, the seismic isolation device described in JP-A-6-158912 rises or hangs from the upper peripheral edge of the lower support plate (spherical case 1B) and the lower peripheral edge of the upper support plate (spherical case 1A). A stopper portion (inner wall 10) is formed, and a number of tension springs 6 are provided as components that restrict the relative horizontal movement of the lower and upper support plates within a certain range. According to this seismic isolation device, the lower bearing plate and the upper bearing plate relatively start horizontal movement through the rolling of the sphere provided therebetween due to the vibration of the earthquake, and the sphere eventually reaches the stopper portion. The horizontal movement of the lower support plate and the upper support plate is further restricted by the stopper portion. The horizontal movement of the lower and upper bearing plates is also restricted by the elastic force of the plurality of tension springs, and the tension springs restore the seismic isolation device to a state before the occurrence of the earthquake. It also acts as a force. In addition, as described above, a certain range or limit is provided for the amplitude stroke of a seismically seismic earthquake, and when an earthquake having an amplitude stroke greater than the range or the limit occurs, as a device for limiting the seismic isolation effect. In addition, there has been proposed a structure in which a damper, a stopper, and the like are provided at a position apart from the installation position of the seismic isolation device. Regarding the damper, like a steel rod damper disclosed in Japanese Utility Model Publication No. Hei 7-23442, a seismic force is obtained by applying a deformation such as bending or twisting to the steel rod 5 against shaking in all directions due to the earthquake. Some of them absorb vibrations and shocks. Further, a viscous damper represented by an oil damper includes a cylinder and a piston, and absorbs vibration and shock due to an earthquake by viscous resistance when fluid in the cylinder passes through an orifice provided in the piston. .

However, the above-mentioned Japanese Patent Application Laid-Open No. H6-158
In the seismic isolation device described in No. 912, when an earthquake having an amplitude stroke exceeding the seismic isolation range occurs, the sphere collides with the stopper, and a loud impact sound is generated for each impact. In addition, this seismic isolation device has the effect of restricting the relative horizontal movement between the lower support plate and the upper support plate even with a large number of tension springs, but how to set the elastic modulus of the tension spring is a technical issue. And the replacement work also takes time. Further, in the steel rod damper disclosed in Japanese Utility Model Publication No. 7-23442, when the earthquake is strong and the amplitude stroke of the ground is large, residual deformation remains in the steel rod, and replacement is necessary every time an earthquake occurs. The cost is high. In addition, when viscous dampers are provided, considering that it is necessary to cope with seismic ground motion in all directions, it is necessary to install extremely large amounts for one structure, and the construction period is greatly extended. In addition, the cost is high, and it is difficult to adopt it for detached houses and the like.

Therefore, the present invention has been proposed to solve various problems of the seismic isolation structure using the above-described conventional seismic isolation device, and (a) strong wind such as typhoon acts on the structure. By doing so, it is possible to effectively prevent the structure from rising or falling,
(B) For a base-isolated structure having a certain range or limit in the amplitude stroke of the earthquake that can be handled, the seismic isolation device is damaged even if an earthquake with an amplitude stroke exceeding the range or the limit occurs. Not only does it have a fail-safe function, such as preventing the occurrence of shocks, but also (c) it can effectively reduce the generation of loud impact noise and impact noise due to the vibration of an earthquake, and does not require a large amount of labor for replacement work. Further, (d) an epoch-making device for preventing the seismic isolation structure from being lifted without significantly prolonging the construction period and suppressing the price, and a light-weight structure provided with this device. The purpose is to provide a seismic structure.

[0009]

The present invention has been proposed to achieve the above object, and the first invention (the invention described in claim 1) to the third invention (the claim 3) The present invention relates to a device for preventing a seismic isolation structure from lifting,
The invention (invention of claim 4) relates to a seismic isolation structure of a light-weight structure provided with the above device. Therefore,
The first invention (the invention according to claim 1) is used for a base-isolated structure to be seismically isolated by a base-isolation device, and has an upper end side fixed to a base of a light-weight structure and a ground side. One and the other upper fixed portion hanging down, and an upper horizontal portion having one end continuous with the lower end of the one upper fixed portion and the other end continuous with the lower end of the other upper fixed portion, An upper fixing bracket having a lower end fixed to the upper surface of the ground, and the other lower fixing portion, and one end is continuous with the upper end of the one lower fixing portion and the other end is A lower horizontal metal part having a lower horizontal part that is continuous with the upper end of the other lower fixed part and straddles the upper horizontal part and is orthogonal to the upper horizontal part, and At least one of the inner surface of the one and the other upper fixing portion or both side surfaces of the lower horizontal portion A first shock absorber is fixed, and a second shock absorber is fixed to at least one of the inner surface of the one and other lower fixing portions or both sides of the upper horizontal portion. The first and / or second shock absorbing material is formed by laminating a plurality of layers made of rubber or elastic foam and having different hardnesses, and the first and / or second shock absorbing material is fixed to the inner surface of the one and other upper fixing portions. A distance from the inner side surface of the shock absorbing member to the both side surfaces of the lower horizontal portion, or a distance between the first and second upper fixing portions from the surface of the first shock absorbing member fixed to both sides of the lower horizontal portion. Distance to the side surface, or distance from the inner surface of the second shock absorber fixed to the inner surface of the one and other lower fixing portions to both side surfaces of the upper horizontal portion, or both sides of the upper horizontal portion From the surface of the second shock absorber fixed to And the distance to the inner surface of the lower fixed part is slightly shorter than about half the maximum amplitude stroke length of the earthquake to be seismically isolated by the seismic isolation device. Things.

The rubber which is a material of the first and second shock absorbing materials constituting the first invention is, for example, rubber.
Natural rubber (latex rubber), styrene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, ethylene-propylene rubber, acrylic rubber, urethane rubber, silicone rubber,
Synthetic rubber such as fluororubber and polysulfide rubber, or thermoplastic elastomer can be used. Examples of the thermoplastic elastomer include olefin elastomers (polyethylene elastomer, polypropylene elastomer), amide elastomers (polyamide elastomer), styrene elastomers (styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylenebutylene-styrene). Copolymer), polyurethane, and urethane-based elastomer. As the urethane-based elastomer, thermoplastic polyether polyurethane,
A thermoplastic polyurethane such as a thermoplastic polyester polyurethane can be given. In addition, more specifically, as the rubber, a trademark “Hanenit” related to the manufacture of Naigai Rubber Co., Ltd. or a trademark “Haplagel” related to the manufacture of Daiichi Denko Corporation may be used. Further, as another material of the shock absorbing material, a sponge-like porous polyurethane, a porous polyvinyl polyvinyl, or an elastic foam such as urethane foam, cellulose foam, or nylon foam can be used. More specifically, as the elastic foam, a trademark “Memory Foam” made of polyurethane foam and sold by Casey Shokai Co., Ltd. may be used.

The second invention (the invention according to claim 2)
In the first aspect, the first and / or second
The shock absorbing material is a hard layer made of rubber or elastic foam, a medium layer made of rubber or elastic foam having a lower hardness than this hard layer, and a rubber or elastic material having a lower hardness than this medium layer. A soft layer made of a foam is laminated in an arbitrary order.

The hard layer constituting the second invention,
For the intermediate layer and the soft layer, three materials having different hardnesses may be appropriately extracted from the rubber or the elastic foam described above, and these materials may be laminated in any order, and the order of lamination is not particularly limited. The type of rubber that can be used as the hard layer is relatively determined in relation to the hardness of the rubber or elastic foam used for the other middle layer or soft layer. For example, urethane rubber , Acrylic rubber, fluorine rubber and the like can be used. Further, as the above-mentioned intermediate rubber, for example, nitrile rubber, butyl rubber, ethylene propylene rubber and the like can be used.
Natural rubber, styrene rubber, silicone rubber, a thermoplastic elastomer, or the trademark “Haplagel” produced by Dai-Ichi Denko Co., Ltd. can also be used.

The third invention (the invention according to claim 3)
In the first or second invention, the first shock absorbing material is fixed to an inner surface of the one and other upper fixing portions, and the second shock absorbing material is fixed to a lower portion of the one and the other. The first and second shock absorbers are fixed to the inner surface of the side fixing portion, and at least the inner surfaces of the first and second shock absorbers are hardest compared to the other layers constituting the first and second shock absorbers. Characterized by a high rubber or elastic foam.

The fourth invention (the invention according to claim 4)
The seismic isolation device that allows the ground side and the structure side to relatively displace in the horizontal direction is provided, and the device for preventing the seismic isolation structure from rising according to claim 1, 2, or 3. Is provided.

The above-mentioned seismic isolation device is a so-called laminated rubber isolator described in the section of the prior art as long as it allows at least the ground side and the structure side to be relatively displaced in the horizontal direction. This includes those using structures such as earthquakes, sliding bearings or sliding seismic isolation, and roller seismic isolation, and also includes devices using these structures in combination.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a seismic isolation structure of a seismic isolation structure according to the present invention; Embodiments will be described in detail with reference to the drawings.

First, a seismic isolation structure using the lifting prevention device according to the present invention will be briefly described, and then the lifting prevention device will be described. In this seismic isolation structure, as shown in FIG. 1, a seismic isolation device 30 constituting the present invention is interposed between the foundation concrete A as the ground and the light-weight structure, and the seismic isolation device 30 is used. The structure is made. The seismic isolation device 30 includes a lower support plate 31 fixed on a base plate (not shown) fixed to the upper surface of the foundation concrete A, a sphere 32 mounted on the lower support plate 31, and a sphere 32 An upper support plate 33 supported on the upper surface 32 is fixed to the lower surface of the steel base S. The lower support plate 31 is integrally formed of iron in a disk shape, and has a bottom portion 31a formed in a disk shape, and a ring-shaped lower portion standing upright from a peripheral edge of the bottom portion 31a. Stopper part 31
b. The upper support plate 33
Is an upper panel 3 having the same shape as the lower support plate 31.
3a and a ring-shaped upper stopper 33b hanging down from the periphery of the upper panel 33a. In this embodiment, a wooden base W is formed on the upper surface of the steel base S, and the lower ends of a number of columns P are fixed to the upper surface of the wooden base W. The light weight structure is constituted by the base W, the pillar P and the like.
Therefore, the light-weight structure has a seismic isolation structure that is seismically isolated by the seismic isolation device 30. In particular,
When the ground (foundation concrete A) vibrates due to the vibration of the earthquake, the sphere 32 is moved to the bottom portion 3 of the lower support plate 31.
Rolling occurs between the upper surface of 1a and the lower surface of the upper plate portion 33a of the upper support plate 33. Due to the rolling of the sphere 32, the load due to the vibration of the earthquake does not act on the light weight structure. In addition,
In the seismic isolation device 30, the distance from the state shown in FIG. 1 until the sphere 32 abuts on the lower stopper portion 31b or the upper stopper portion 33b due to the occurrence of an earthquake is the range in which seismic isolation is possible. If the length of half of the amplitude stroke is longer than this distance, the seismic load will not act on the light-weight structure without seismic isolation.

Next, the lifting prevention device 1 constituting the present invention (the inventions of claims 1, 2 and 3) will be described. This lifting prevention device 1 is, as shown in FIG.
It is composed of an upper fixture 2 and a lower fixture 3. As shown in FIG. 2 or FIG. 3, the upper fixture 2 is fixed to the lower surface of the steel base S and is suspended on the ground side (the foundation concrete A side). The other upper side fixed at a position slightly separated from the upper side fixed part 2a and fixed to the lower surface of the steel frame base S to which the one upper side fixed part 2a is fixed and hanging down to the ground side (the foundation concrete A side). A portion 2b, one end of which is connected to the lower end of the one upper fixing portion 2a and the other end is connected to the lower end of the other upper fixing portion 2b, and is formed in parallel with the steel base S. And a horizontal portion 2c. The one and other upper fixing portions 2a and 2b are provided with one or other seating portions 2 having insertion holes (not shown) through which bolts 5 are inserted.
d, 2e are formed. In the present embodiment, the present invention is applied to the inner surface of the one upper fixing portion 2a and the inner surface of the other upper fixing portion 2b facing the inner surface of the upper fixing portion 2a. The constituent first shock absorbing members 6 and 7 are adhered. These first shock absorbers 6 and 7 form first hard layers 8 and 9 which form inner surfaces of the first shock absorbers 6 and 7 and are formed in a plate shape by hard rubber, respectively. First intermediate layers 10, 11 bonded to the inner surfaces of the one and other upper fixing portions 2a, 2b, and the first intermediate layers 10, 11 and the first intermediate layer
1 formed between the hard layers 8 and 9
And three soft layers 12, 13. Each of the first intermediate layers 10 and 11 is formed of a rubber having a hardness slightly lower than that of each of the first hard layers 8 and 9, and the first soft layers 12 and 13 are formed of rubber. It is formed in a plate shape from rubber having a lower hardness than the intermediate layers 10 and 11. In the present embodiment, each of the first hard layers 8 and 9 is made of acrylic rubber, each of the first intermediate layers 10 and 11 is made of butyl rubber, and each of the first soft layers 8 and 9 is made of butyl rubber. Reference numerals 12 and 13 are made of styrene rubber.

As shown in FIG. 2, the lower fixing bracket 3 has one lower fixing portion 3a having a lower surface fixed to the upper surface of the foundation concrete A and rising upward.
The lower surface is fixed to the upper surface of the foundation concrete A at a position (direction orthogonal to the length direction of the upper horizontal portion 2c constituting the upper fixing bracket 2) slightly separated from the one lower fixing portion 3a. The other lower fixed portion 3b, one end of which is continuous with the upper end of the one lower fixed portion 3a and the other end is continuous with the upper end of the other lower fixed portion 3b, and And a lower horizontal portion 3c formed slightly above the portion 2c. The one and other lower fixing portions 3a and 3b are respectively formed with one and other seating portions 3d and 3e in which insertion holes (not shown) through which the anchor bolts 14 are inserted are formed. In this embodiment, the one lower fixing portion 3 is used.
a on the inner surface of the lower fixing portion 3a and the inner surface of the other lower fixing portion 3b facing the inner surface of the lower fixing portion 3a. Is glued. The second shock absorbers 15 and 16 form second hard layers 17 and 18 which form inner surfaces of the second shock absorbers 15 and 16 and are formed of hard rubber in a plate shape, respectively. Lower fixing part 3 of one and the other of the above
a, the second intermediate layer 19 adhered to the inner surface of 3b,
And two second soft layers 21 and 22 sandwiched between the second intermediate layers 19 and 20 and the second hard layers 17 and 18. I have.
Each of the first intermediate layers 19 and 20 is formed of the second hard layer 1.
The second soft layers 21 and 22 are formed in a plate shape by a rubber having a lower hardness than the intermediate layers 19 and 20. It is molded. In the present embodiment, each of the second hard layers 17 and 18 is made of acrylic rubber, each of the second intermediate layers 19 and 20 is made of butyl rubber, and each of the second soft layers 21 and 22 are made of styrene rubber.

The distance from the inner surface of the first hard layers 8 and 9 constituting the first shock absorbers 6 and 7 to the side surface of the lower horizontal portion 3c and the second shock absorber 15 ,
The distance from the inner side surfaces of the second hard layers 17 and 18 constituting the upper side 16 to the side surface of the upper horizontal portion 2c depends on the seismic isolation device 3.
The length is set to be slightly shorter than about half the maximum amplitude stroke length of the earthquake to be isolated by zero. Here, the distance from the inner side surface of the first hard layer 8, 9 to the side surface of the lower horizontal portion 3c and the second hard layer 17, 18
The distance from the inner side surface to the side surface of the upper horizontal portion 2c is
The direction of the amplitude stroke of the earthquake is the same as the length direction of the upper fixture 2 or the same as the length direction of the lower fixture 3 which is a direction orthogonal to the length direction of the upper fixture 2. In the present embodiment, the distance in the direction inclined at 45 degrees is larger than the distance in the direction inclined at 45 degrees from the direction of the seismic isolation device. The length is set to be slightly shorter than about half the maximum amplitude stroke length of the earthquake to be isolated by 30.

Next, the operation and effects of the lifting prevention device 1 according to the above-described embodiment will be described. First,
When the amplitude stroke of the generated earthquake is within a range that can be seismically isolated by the seismic isolation device 30, the load due to the earthquake vibration is light weight due to the rolling (reciprocating motion) of the sphere 32. There is little impact on the structure and the light weight structure is well protected from the quake of an earthquake. On the other hand, when the amplitude stroke of the earthquake exceeds the length of the range in which the seismic isolation device 30 is capable of seismic isolation, the sphere 32 is connected to the lower stopper portion 31b constituting the lower support plate 31.
Before colliding with the upper stopper 33b, the first shock absorbers 6 and 7 provided on the upper fixture 2 or the second shock absorbers 15 and 16 provided on the lower fixture 3 are completely removed. Compressed. More specifically, first, the first shock absorbers 6 and 7 (or the second shock absorbers 15 and 15) are used.
16), the first soft layers 12 and 13 (or the second soft layers 21 and 22) are compressed, and the first soft layer 1
When the second soft layers 2 and 13 (or the second soft layers 21 and 22) are sufficiently compressed, the first middle layers 10 and 11 (the second middle layers 19 and 20) are then compressed, and the first first layers 11 and 20 are further compressed. Hard layers 8, 9
(The second hard layers 17, 18) are compressed. That is,
When an earthquake having an amplitude stroke exceeding the length of the seismic isolation device 30 is generated by the seismic isolation device 30, the earthquake is compressed in order from a layer having a lower hardness (a code is omitted).

Therefore, according to the device 1 for preventing lifting, the load of the earthquake is not suddenly applied to the light-weight structure, and the sphere 32 and the lower stopper portion 31b constituting the seismic isolation device 30 are provided. It is also possible to effectively prevent the occurrence of a large impact or impact noise due to the collision with the upper stopper 32b. In the lifting prevention device 1 according to the present embodiment, the first shock absorber 6
7 and the inner surfaces of the second shock absorbers 15 and 16 are respectively provided with the first hard layers 8 and 9 or the second hard layer 1.
7 and 18, when compressed by the lower horizontal portion 3c constituting the lower fixing bracket 3 or the upper horizontal portion 2c constituting the upper fixing bracket 2, the first hard layer 8,
It is possible to effectively prevent deterioration such as cracking or tearing of the 9 or the second hard layers 17 and 18.

When a strong wind such as a typhoon acts on the light-weight structure, the upper surface of the lower horizontal portion 3c constituting the lower fixing member 3 is connected to the upper horizontal portion 2 constituting the upper fixing member 2.
Since the light weight structure comes into contact with the lower surface of c, the lifting of the light weight structure can be sufficiently suppressed. That is, according to the lifting prevention device 1 according to the present embodiment and the light-weight structure provided with the device 1, even when an earthquake with an amplitude stroke exceeding the range that can be isolated by the seismic isolation device 30 occurs, A large impact does not suddenly act on the light-weight structure and the impact sound can be effectively mitigated, and the light-weight structure is effectively prevented from being lifted even by a strong wind such as a typhoon. be able to.
In addition, in the lifting prevention device 1, the construction is simple, so that the manufacturing cost can be suppressed, and since the mounting and maintenance are simple, the construction period can be shortened, and the cost for maintenance and management can be suppressed. be able to.

In the above embodiment, first,
The figure shows a first shock absorbing material constituting the present invention bonded to the inner surfaces of one and the other upper fixing portions, and a second shock absorbing material bonded to the inner surfaces of the one and the other lower fixing portions. As shown and described, for example, the first shock absorbing material is fixed to both side surfaces of a lower horizontal portion forming a lower fixing bracket, and the second shock absorbing material is fixed to an upper horizontal portion forming an upper fixing bracket. May be fixed to both side surfaces of. Although the first and second shock absorbers are illustrated and described by laminating three layers each having a different hardness, the present invention (the invention according to claim 1) is not necessarily limited to three layers. It is not necessary to be an original shape, and it is sufficient that a plurality of layers having different hardnesses are laminated. Even when three layers are laminated, for example, a soft layer is laminated between a hard layer and a hard layer. There may be. Further, in the above-described embodiment, the so-called roller seismic isolation structure is adopted as the seismic isolation device constituting the present invention. However, a so-called laminated rubber seismic isolation or sliding seismic isolation structure or device is used. It may be something.

[0025]

As apparent from the above description of the device for preventing the seismic isolation structure from lifting according to the embodiment of the present invention and the seismic isolation structure for a light-weight structure provided with this device,
According to the present invention (invention of claim 1 or 4), even when wind pressure such as a typhoon acts on a light-weight structure, the upper horizontal part and the lower fixing metal constituting the upper fixing metal are formed. Due to the contact with the lower horizontal portion, it is possible to effectively prevent the light weight structure from being lifted up by wind pressure. Also, when the first or second shock absorbing material is compressed, it is before the maximum amplitude stroke length of the seismic isolated by the seismic isolation device is exceeded, so that the seismic isolation device may be damaged or the sphere may be damaged. When using the seismic isolation device as a component, the impact and impact noise between the sphere and the stopper portion can be effectively mitigated, and a large load is not suddenly applied to the light weight structure. Furthermore, according to this lifting prevention device, the construction cost is reduced because the structure is simple, and the installation and maintenance are simple, so that the construction period can be shortened and the cost for maintenance and management can be reduced. Can be suppressed.
In particular, in the first invention, when an earthquake having an amplitude stroke exceeding the range that can be isolated by the seismic isolation device occurs, the first and / or second shock absorber is made of rubber or elastic foam. Since a plurality of layers having different hardnesses are laminated, it is possible to further prevent suddenly applying a large impact to a light weight structure as compared with a case where a shock absorbing material made of a single material is used as a component. Can be.

In the second invention (the second invention),
The first and / or second shock absorbing material comprises: a hard layer made of rubber or elastic foam; a middle layer made of rubber or elastic foam having a lower hardness than the hard layer; Also, since a soft layer made of rubber or an elastic foam having a lower hardness is laminated in an arbitrary order, it is possible to further greatly apply a larger impact to a light-weight object as compared with the first invention. Can be prevented.

Further, the third invention (the invention according to claim 3)
Then, the first shock absorbing material is fixed to the inner surfaces of the one and the other upper fixing portions, and the second shock absorbing material is fixed to the inner surfaces of the one and the other lower fixing portions. In addition, at least the inner surfaces of the first and second shock absorbers are made of rubber or elastic foam having the highest hardness as compared with the other layers constituting the first and second shock absorbers. Therefore, it is possible to reduce the amount of the shock absorbing material to be used, and to effectively prevent the shock absorbing material from being cracked or torn when the shock absorbing material is repeatedly compressed.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a seismic isolation structure using a device for preventing a seismic isolation structure from rising according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the lifting prevention device shown in FIG. 1;

FIG. 3 is a front sectional view showing the lifting prevention device shown in FIG. 2;

FIG. 4 is a diagram showing a first case in which an earthquake has occurred from the state shown in FIG. 1;
FIG. 4 is a front sectional view showing a state in which the shock absorbing material is compressed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lifting prevention device 2 Upper fixing metal 2a One fixing part 2b The other fixing part 2c Upper horizontal part 3 Lower fixing metal 3a One fixing part 3b The other fixing part 3c Lower horizontal part 6,7 First shock absorption Material 8,9 First hard layer 10,11 First medium layer 12,13 First soft layer 15,16 Second shock absorber 17,18 Second hard layer 19,20 Inside second Ply layer 21, 22 Second soft layer 30 Seismic isolation device 31 Lower support plate 32 Sphere 33 Upper support plate S Steel base W Wooden base P Column

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Hagiwara 4040 Kuramatsucho, Hamamatsu-shi, Shizuoka F-term in Ichijo Corporation Hamamatsu Plant (reference) 3J048 AA01 AD11 BA08 BB01 BD02 BD04 BD05 BG02 EA38

Claims (4)

[Claims] A seismic isolation structure to be seismically isolated by a seismic isolation device, wherein one of the upper and lower ends is fixed to the base of a light-weight structure, and the other is suspended from the ground. An upper fixing part having an upper fixing part and an upper horizontal part having one end continuous with the lower end of the one upper fixing part and the other end continuing to the lower end of the other upper fixing part; One and the other lower fixing portion having a lower end fixed to the upper surface of the ground, and one end being continuous with the upper end of the one lower fixing portion and the other end being an upper end of the other lower fixing portion. And a lower fixing bracket having a lower horizontal portion that is continuous and crosses the upper horizontal portion and is orthogonal to the upper horizontal portion. A first shock absorbing material is fixed on at least one of the inner side surface and both side surfaces of the lower horizontal portion. A second shock absorbing material is fixed to at least one of the inner surface of the one and other lower fixing portions or both sides of the upper horizontal portion, and the first and / or second Is made of rubber or elastic foam, and is formed by laminating a plurality of layers each having a different hardness. The distance from the side surface to both side surfaces of the lower horizontal portion, or the distance from the surface of the first shock absorbing material fixed to both sides of the lower horizontal portion to the inner surface of the one and other upper fixing portions, or The distance from the inner surface of the second shock absorbing material fixed to the inner surface of the one and the other lower fixing portion to both side surfaces of the upper horizontal portion, or the second fixed to both sides of the upper horizontal portion The lower fixing part of the one and the other from the surface of the shock absorbing material The distance to the inner surface is set to be slightly shorter than about half of the maximum amplitude stroke length of the earthquake to be seismically isolated by the seismic isolation device, and the device for preventing the seismic isolation structure from being lifted up. . 2. The first and / or second shock absorbing material comprises: a hard layer made of rubber or elastic foam; and a medium layer made of rubber or elastic foam having lower hardness than the hard layer. 2. The device according to claim 1, wherein the soft layer made of rubber or elastic foam having a lower hardness than the intermediate layer is laminated in an arbitrary order. 3. The first shock absorbing material is fixed to the inner surfaces of the one and the other upper fixing portions, and the second shock absorbing material is fixed to the inner surfaces of the one and the other lower fixing portions. At least the inner surfaces of the first and second shock absorbers are fixed, and the rubber or elastic foam having the highest hardness as compared with the other layers constituting the first and second shock absorbers The device for preventing a seismic isolation structure from lifting according to claim 1 or 2, wherein the device comprises: 4. The seismic isolation device according to claim 1, further comprising a seismic isolation device that allows the ground side and the structure side to relatively displace in the horizontal direction. A seismic isolation structure for light-weight structures, characterized by being provided with a lifting prevention device.