JPH0635763B2 - Seismic isolation building with fail-safe mechanism - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wooden house or the like having a seismic isolation floor structure and provided with safety measures when the seismic isolation device does not work effectively.

[Conventional technology]

Some reinforced concrete buildings have seismic isolation devices installed between the foundation and the foundation. This seismic isolation device is generally composed of a combination of a rigid body and an elastic body such as a laminated body in which a rubber plate is sandwiched between thin metal plates and is adhered with an adhesive, and seismic waves are mainly distributed in the horizontal direction of the elastic body. It is a device that absorbs and relaxes by repeating shifting or deformation to prevent the building from being directly subject to vibration. However, no conventional wooden house has a seismic isolation device installed between the foundation and the base. That is, as shown in FIG. 8, as a floor structure of a conventional wooden house, a position directly below the foundation A is installed in order to erect a large pull C, which is the main body of the floor structure, between bases B on two sides facing each other on a foundation A. A large number of stones D were laid at intervals on the corresponding ground. Then, the floor or E was erected on each of the stones D, and then the large pull C was installed on the floor or E of each row. A floor joist F is placed and fixed between the adjacent pullouts C, and a fixed-sized floor plywood G is stretched on the upper surface of the floor joist F.

[Problems to be Solved by the Invention]

In this way, in the conventional floor structure, since the floor or E on each stone D supports the large pull C directly as a fulcrum, there is nothing that absorbs vibrations such as earthquakes, etc. Installation of the device was also difficult. Furthermore, even if the seismic isolation device is installed by intentionally selecting many important points in the conventional wooden house as described above, the natural force exceeding the seismic isolation limit of the seismic isolation device is included, even in the case of an unexpected failure. When working in a building, there was a problem that the second best emergency safety measure, namely fail-safe measure, could not be taken. For example, when the amplitude of ground shaking exceeds the limit such as displacement of the seismic isolation device, or when a strong typhoon acts on the superstructure of the building, which is different from the earthquake, causes the building to shake or move. There was a problem that it was not possible to take measures to prepare for an emergency.

Therefore, an object of the present invention is to provide a wooden base-isolated building provided with a fail-safe mechanism.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention installs a seismic isolation device at a key point of a foundation of a wooden building such as a wooden house, and installs a steel frame pedestal in a series on the seismic isolation device to face each other. Having a seismic isolation floor structure in which wooden parallel string trusses are installed between the steel frame mounts, the required height lower than that of the seismic isolation device can be maintained, and the building can be supported when the building deviates by a predetermined distance or more. A base-isolated building provided with a fail-safe mechanism in which a supporting base is fixed on a foundation in the vicinity of the seismic isolation device, and preferably, the supporting base is placed in a shape oblique to the laying direction of the foundation, It is to be fixed on the foundation at the intersection position with, and the support base can be locked to the steel frame.

[Action]

When constructing a base isolation floor structure on the foundation with the above structure, a seismic isolation device is installed on at least the four corners of the foundation, which are important points of the foundation. A steel frame is installed in the form of a circle that goes around the four corners that are the key points of the foundation. For this reason, if a large number of parallel string trusses, which were formed in advance by factory production so as to be integrated with each other, are erected at intervals between the two opposite steel frame pedestals, all the loads applied to the parallel string trusses will be the steel frame pedestal. It will act on the contact points of both ends that are combined with. Therefore, the seismic waves transmitted from the ground are reliably absorbed and mitigated by the seismic isolation device placed in a well-balanced manner on the outer periphery of the building,
The entire building including the floor structure will be seismically isolated to prevent damage to the building and furniture.

If the seismic intensity of the earthquake that occurred is large or the seismic isolation device is defective, and the steel frame of the building is horizontally displaced beyond the seismic isolation limit of the seismic isolation device, the seismic isolation of the steel frame is performed. Since it is supported by a support stand near the equipment, the safety of the building can be maintained. Further, when the building is expected to shake due to a strong wind such as a typhoon, the steel frame pedestal of the building is locked in advance to the support pedestal in the original position. As a result, it is possible to fix the building to the ground so that the seismic isolation device does not work and to prevent the building from shaking due to strong wind.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First of all, the structure will be explained. As shown in FIGS. 1 to 4, the foundation 1 is constructed by placing concrete in the four corners of the site, which has a predetermined building coverage ratio to be a wooden house, and in the central zone. At the intersection of the four corners and the central belt on the foundation 1, a known seismic isolation device 2 that absorbs vibrations such as earthquakes by interposing rubber plates between metal plates is used to insert anchor bolts and the like. It is installed so that it can be seismically isolated by tightening.

Next, on the upper surface position of each seismic isolation device 2 according to this aspect, a series of steel frame pedestals 3 made of H-shaped steel are placed so as to match the above-mentioned foundation 1 at the upper and lower positions, and the bolts are inserted therethrough. It is erected so as to go around the upper part of the foundation 1 by tightening. Further, as described above, between the steel frame pedestals 3 on two sides facing each other on the upper side of the foundation 1, that is, the steel frame pedestal 3 in the central band
A wooden parallel string truss 4 shown in FIG. 3 is erected between two opposite sides of the steel frame pedestals 3 connected to each other.

The parallel string truss 4 integrally composed of the upper and lower horizontal members 4a and 4b, the vertical member 4c and the diagonal member 4d has the ends of the horizontal member 4a located at the upper portion as shown in FIGS. 1 and 2. , A horizontal member 4b which is placed on the upper part of the base 5, which is fixedly secured to each upper surface of the opposing two-sided steel frame pedestals 3 and 3 with bolts, etc. The respective end portions of the above are also placed on the upper surface of the side joist 8 which is fixedly secured to the inner bottom surfaces of the steel frame pedestals 3 and 3 with bolts or the like, and the insertion of bolts or the like (not shown) at each end portion thereof, The steel frame pedestals 3 and 3 facing each other by tightening are sequentially erected at regular intervals, and the whole structure is a wooden base isolation floor structure.

In addition, after the floor plywood 9 is laid on the upper surface of each of the parallel string trusses 4 by a standard plate, the lower frame 10 is attached to the four circumferences of the floor plywood 9 and the upper part of the lower frame 10 is attached. Is the wall frame 11 which is erected, and the outer wall structural plywood for the outer shell
The construction of the outer wall including the floor of the wooden house will be completed by the 12 tensions.

In the case of constructing a base-isolated floor structure on the foundation with the above configuration, the procedure is as follows. That is, as shown in FIG. 4, the seismic isolation device 2 is installed on each upper surface at the intersections of the four corners and the central belt, which are the important points of the foundation 1, so that seismic isolation can be performed by inserting and tightening anchor bolts. After that, when the steel frame 3 is installed above the seismic isolation device 2, the steel frame 3 formed in series becomes an important factor for the seismic isolation floor structure. Therefore, a large number of parallel string trusses 4 formed in advance by factory production so as to be integrated with each other between two steel frame pedestals 3 facing each other at the upper position of the seismic isolation device 2 are bolted at each side end portion. When the floor structure is formed by erection at intervals by coupling, each parallel string truss 4 is configured as a span between the steel frame pedestals 3 on two opposite sides, so that seismic waves transmitted from the ground are isolated by the seismic isolation device. You can relax and enter the building. This makes the building shake 3
It can be reduced to a factor of one.

Further, in the present invention, a supporting base 13 of the building is provided as a fail-safe mechanism for the wooden base-isolated building having the above structure.
The support frame 13 is made of H-shaped steel or the like, and as shown in FIG. 4, it is located in the vicinity of the seismic isolation device 2, that is, in each of the seismic isolation devices, which are disposed at the upper portions of the four corners of the foundation 1 and the intersections with the central belt. Earthquake device 2
It is placed at a position having a predetermined distance in such a manner that it intersects with the laying direction of the foundation 1 and is fixed on the foundation 1 by inserting and tightening anchor bolts.

The height of this support stand 13 is set to be lower than the seismic isolation device 2 by a predetermined height, and a space with a predetermined interval is provided between the base 13 and the steel frame 3 installed on the upper surface of the seismic isolation device 2. is there. In addition, at the intersecting position of the steel frame 3 and the support frame 13, the small holes that match the steel frame 3 and the support frame 13 in the vertical relationship position.
14 and 15 are drilled respectively.

Therefore, even if the seismic isolation device 2 does not work effectively and the building slips beyond the seismic isolation limit, the building can be safely supported by the support frame 13. More specifically, the seismic isolation device 2 usually works effectively according to the amplitude of the sway if the amplitude of the sway is within 25 cm to mitigate the sway of the building. If the seismic isolation device 2 does not work effectively due to damage to the seismic isolation device 2 and the top and bottom surfaces of the seismic isolation device 2 are greatly displaced, the building may collapse. The height of the seismic isolation device 2 is reduced by the load of the building on the steel frame 3 according to the displacement between the upper and lower surfaces. In the embodiment of the present invention, as shown in FIGS. 5 and 6. As a result of the ground moving in the direction of arrow X due to the earthquake, the seismic isolation device 2'is displaced between the upper and lower surfaces, and the relative displacement between the foundation 1'and the steel frame 3 reaches 25 cm. As indicated by the phantom line in Fig. 3, the steel frame 3'depressed by the displacement of the seismic isolation device 2'is placed on the support frame 13 'which is moved by the shaking of the ground, and therefore the building is supported. It is safely supported on the frame 13 '.

Further, if there is an abnormally strong wind such as a typhoon other than in the case of such an earthquake, the building placed on the seismic isolation device 2 shakes, which may cause anxiety to residents. Therefore, when a strong wind such as a typhoon is expected to be inferred from the weather information or the like, as shown by the phantom line in FIG.
If a wedge 16 is driven between the support frame 13 and the support frame 13 and pins 17 are dropped into the small hole 14 of the steel frame structure 3 and the small hole 15 of the support frame 13 from above, the structure of the steel frame structure 3 and therefore its upper structure becomes the support frame 13. The seismic isolation device 2 is locked, in other words, the seismic isolation device 2 is locked, and there is no risk of the building shaking due to abnormally strong wind.
The fail-safe mechanism is not locked at all times, and the seismic isolation device 2 is in a working state.

The above-mentioned seismic isolation building effectively uses the parallel string truss 4 and enables the adoption of the seismic isolation device 2 in a wooden house.
As the entire building including the floor structure can be seismically isolated, the entire building including the floor structure can be seismically isolated. Goods can be protected from earthquakes, and the usability of floor structures in wooden houses can be made comfortable. In addition, even if the seismic isolation device 2 does not work effectively, the supporting frame 13 as a fail-safe mechanism supports the building safely, and the shaking of the building due to an abnormally strong wind such as a typhoon can be prevented. Can be prevented.

〔The invention's effect〕

The present invention uses a steel frame pedestal laid on a foundation by interposing a seismic isolation device as a fulcrum, and lays a long parallel string truss between two sides of the steel frame pedestal with this interval as a span, and a fail-safe mechanism. As a support stand is provided between the foundation and the steel frame stand near the seismic isolation device, and the support stand can be locked with respect to the steel frame stand, the following effects can be obtained.

(1) Since the seismic isolation floor structure does not need to stand on a large number of slabs that are laid at intervals in the ground as in the conventional method, the floor sill does not have to be erected on each ground, so the cost is low and the construction can be done easily and quickly.

(2) When an earthquake occurs, the seismic vibration is absorbed by the seismic isolation device and the seismic force exerted on the building is greatly mitigated, so the building can be prevented from collapsing and the household goods and tools in the house are safe. Can be secured.

(3) In the event of an earthquake, if the seismic isolation device does not work effectively, the building can be supported safely with a support stand to prevent collapse.

(4) In addition, the bearing stand as a fail-safe mechanism can be easily constructed.

(5) Furthermore, the seismic isolation device can be locked against abnormal strong winds such as typhoons to prevent the building from shaking.

[Brief description of drawings]

FIG. 1 of the embodiment is a side view of a main part of a wooden base isolation floor structure according to the present invention, FIG. 2 is a perspective view of the main part of the structure, and FIG. 3 is a schematic view of a parallel string truss part in the same structure. FIG. 4 is a plan view of a steel frame pedestal for explaining the seismic isolation device and the pedestal mounted on the lower surface of the main part of the structure, FIG. 5 is a perspective view for explaining the action of the pedestal, and FIG. Similarly, a side view for explaining the operation of the support frame, FIG. 7 is a sectional view taken along the line VII-VII of FIG. 2, and FIG. 8 is a perspective view for explaining the floor structure of the conventional wooden house. 1 …… Foundation 2 …… Seismic isolation device 3 …… Steel frame base 4 …… Parallel string truss 13 …… Bearing frame

Claims (3)

[Claims] 1. A seismic isolation device is installed at a key point of the foundation of a wooden building such as a wooden house, a series of steel frame pedestals are erected on the seismic isolation device, and a wooden parallel structure is provided between the opposing steel frame pedestals. It has a seismic isolation floor structure with a string truss installed, maintains a required height lower than that of the seismic isolation device, and when the building is displaced more than a predetermined distance,
A base-isolated building having a fail-safe mechanism in which a support frame capable of supporting the building is fixed on a foundation near the seismic isolation device. 2. A base-isolated building provided with a fail-safe mechanism according to claim 1, wherein the support frame is arranged so as to be oblique to the laying direction of the foundation, and is fixed on the foundation at a position intersecting with the foundation. 3. A seismic isolated building equipped with a fail-safe mechanism according to claim 1, wherein the support frame is lockable to the steel frame frame.