JPH01214645A - Earthquake-proof building provided with fail-safe mechanism - Google Patents

Abstract

PURPOSE:To prevent a building from being destroyed by an earthquake by installing a steel frame on an earthquake-proof device set up on the foundation, and fixing a supporting frame, capable of supporting the building when it is shifted as far as the specified distance, onto the foundation in and around the earthquake-proof device. CONSTITUTION:An earthquake-proof device 2 is set up in the important position of a substruction 1 of a wooden building, and a steel frame 3 is installed on this earthquake proof device 2, and furthermore a parallel chord truss 4 is installed between the opposed steel frames 3, forming an earthquake-proof structure. A supporting frame 13, capable of supporting the building when it is shifted as far as more than the specified distance, is fixed on the substructure in and around the earthquake-proof device 2, and thereby a fail-safe mechanism is formed there. With this constitution, since seismic force is absorbed by the earthquake-proof 2, destruction of the building is preventable and, what is more, in case the earthquake-proof device fails to work effectively, the building is safely supportable by the supporting frame 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wooden house etc. that has a seismic isolation floor structure and is equipped with safety measures in case the seismic isolation device does not work effectively.

[Conventional technology]

Some reinforced concrete buildings have seismic isolation devices installed between the foundation and foundation. This seismic isolation device is generally composed of a combination of a rigid body and an elastic body, such as a laminated body with a rubber plate sandwiched between thin metal plates and attached with adhesive. This device prevents vibrations from directly reaching the building by absorbing and mitigating them through repeated displacement or deformation. However, none of the conventional wooden houses had a seismic isolation device installed between the foundation and foundation. In other words, as shown in Fig. 8, in the floor structure of a conventional wooden house, in order to erect the main body of the floor structure C between the foundations B on two opposing sides on the foundation A, A large number of stones were laid at intervals on the ground. After erecting a tokotsuka (E) on each of these stone stones, a large drawer (C) was erected on top of the tokoka (E) in each row. Note that a floor joist F is placed and fixed between two adjacent floor joists F, and a fixed-length floor base plate G is stretched over the upper surface of the same floor joist F.

[Problem to be solved by the invention]

In this way, in the conventional floor structure, the floor orifice E above each stone serves as a fulcrum and directly supports the main puller C, so there is nothing to absorb vibrations such as earthquakes, and there is no seismic isolation as mentioned above. Installation of the equipment was also difficult. Furthermore, even if you choose many important points in a conventional wooden house to install seismic isolation devices, natural forces that exceed the seismic isolation limit of the seismic isolation device may occur, including in the case of unexpected failures. There was a problem in that when working in a building, it was not possible to take the next best emergency safety measures, that is, fail-safe measures. For example, in severe natural phenomena such as when the amplitude of ground shaking exceeds the limit of the displacement of base isolation devices, or when buildings shake or move due to strong typhoons that act on the superstructure of buildings, which is different from earthquakes. There was a problem in that no measures could be taken in the unlikely event that this occurred.

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

[Means to solve the problem]

In order to achieve the above object, this invention installs a seismic isolation device at key points of the foundation of a wooden building such as a wooden house, and erects a series of steel frames on top of the seismic isolation device, facing each other. It has a seismic isolation floor structure with wooden parallel chord trusses installed between the steel frame frames, maintains a required height lower than the seismic isolation device, and can support the building when it shifts by a predetermined distance or more. The seismic isolation building is equipped with a fail-safe mechanism in which a support pedestal is fixed to a foundation near the seismic isolation device, and preferably the support pedestal is disposed obliquely to the laying direction of the foundation. It is fixed on the foundation at a position intersecting with the foundation, and the support pedestal is lockable to the steel frame frame.

[Effect]

With the above configuration, when constructing a seismic isolation floor structure on the foundation, seismic isolation devices are installed on at least the four corners, which are important points of the foundation, and with the intervention of this seismic isolation device, the foundation A steel frame frame will be erected around the four corners of the foundation. For this reason, if a large number of parallel string trusses, each of which is pre-fabricated and integrally formed in a factory, are erected at intervals between the steel frame frames on two opposing sides, all the load applied to these parallel chord trusses will be transferred to the steel frame frame. It will act on the contacts at both ends connected to.

Therefore, seismic waves transmitted from the ground are reliably absorbed and alleviated by seismic isolation devices placed in a well-balanced manner around the outer periphery of the building, making the entire building including the floor structure in a good seismic isolation state.
Protect buildings and furniture from destruction.

In the unlikely event that the seismic intensity of an earthquake that occurs is large or there is a failure in the seismic isolation device, and the steel frame of the building shifts horizontally beyond the seismic isolation limit of the seismic isolation device, the steel frame will be seismically isolated. Since it is supported on a support frame near the device, the safety of the building can be maintained. Furthermore, when the building is expected to shake due to strong winds such as a typhoon, the steel frame of the building is locked to the support frame in advance in its original position. This allows the building to be fixed to the ground so that the seismic isolation device does not operate, thereby preventing the building from shaking due to strong winds.

〔Example〕

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

First, to explain the structure, as shown in Figures 1 to 4, a foundation l is constructed by pouring concrete at the four corners of a site with a predetermined building coverage ratio for a wooden house, and in the center zone. A known seismic isolation device 2, which absorbs vibrations caused by earthquakes, etc. by interposing rubber plates in a laminated manner between metal plates, is installed at the four corners of the foundation l and at the intersection with the central belt, and the anchor bolts etc. It is installed so that it can be seismically isolated by tightening.

Next, on the upper surface of each seismic isolation device 2 according to this aspect, a series of steel frames 3 formed of H-beam steel are placed so as to match the above-mentioned foundation l in the upper and lower positions, and bolts are inserted therethrough. By tightening and tightening, it is constructed so as to go around the upper part of the foundation 1.

In addition, between the steel frame frames 3 on two opposing sides on the upper side of the foundation 1, that is, between the steel frame frames 3 on the two opposite sides connected to the steel frame frame 3 in the central band, there is a parallel wooden frame as shown in FIG. A string truss 4 is installed.

The parallel chord truss 4, which is integrally composed of the upper and lower cross members 4a, 4b, the vertical members 4C, and the diagonal members 4d, has each end of the upper cross member 4a as shown in FIGS. 1 and 2. , a horizontal member 4b placed on the upper part of the base 5, supporting side joists 6, and connecting members 7, which are fixedly fixed by bolts or the like on the upper surfaces of the two opposing steel frames 3.3, and located at the lower part. Each end is also placed on the upper surface of the side joist 8 which is fixed with bolts etc. on each inner lower surface of the steel frame frame 3.3, and the insertion of bolts, etc. (not shown) at each end, and the They are sequentially erected at specified intervals between the steel frame frames 3.3 on opposite sides by tightening, and the structure as a whole is composed of a wooden seismic isolation floor structure.

In addition, after the floor plywood 9 is laid all over the upper surface of each of the above-mentioned parallel string truss 4 according to the standard provision, the lower frame 10 is attached to the four circumferences of this floor plywood 9, and the upper part of the lower frame 10 of the bracket is installed. The construction of the external wall including the floor of the wooden house is completed by erecting the wall framework 11 and stretching the external wall structure plywood 12 to the outer frame.

With the above configuration, when constructing a seismic isolation floor structure on the foundation, proceed as follows. In other words, as shown in Fig. 4, seismic isolation devices 2 are installed on the top surface of the four corners of the foundation 1, which are important points, and at the intersections with the central zone, so that seismic isolation can be achieved by inserting and tightening anchor bolts. After that, when a steel frame pedestal 3 is installed on top of this seismic isolation device 2, this continuous steel frame pedestal 3 becomes an important factor in the seismic isolation floor structure. Therefore, a large number of parallel chord trusses 4, which are formed in advance by factory production so as to be integrated, are installed between the steel frame frames 3 on two opposing sides at the upper position of the seismic isolation device 2, and bolted at each side end. When a floor structure is formed by connecting them at intervals, each parallel chord truss 4 is configured as a span between the steel frames 3 on two opposing sides, so seismic waves transmitted from the ground are prevented by the seismic isolation device. You can relax and enter the building. This can reduce the shaking of the building to about one-third.

In the present invention, a building support pedestal 13 is further provided as a fail-safe mechanism for the wooden seismically isolated building configured as described above. This support pedestal 13 is made of H-shaped steel or the like, and as shown in FIG. It is placed at a predetermined distance from the seismic device 2 in a manner diagonal to the laying direction of the foundation 1, and is fixed onto the base rJ11 by inserting and tightening anchor bolts.

The height of this support pedestal 13 is set lower than that of the seismic isolation device 2 by a predetermined height, and a gap of a predetermined distance can be provided between it and the steel frame pedestal 3 installed on the top surface of the seismic isolation device 2. be. Moreover, at the intersection position of the steel frame pedestal 3 and the support pedestal 13,
Small holes 14 and 15 are formed in the steel frame frame 3 and the support frame 13, respectively, so as to match in vertical positions.

Therefore, even if the seismic isolation device 2 does not work effectively and the building slides beyond the seismic isolation limit, the building can be safely supported by the support frame 13. To explain specifically, the seismic isolation device 2 normally has a vibration amplitude of 25
If it is within cm, it will work effectively according to the amplitude and alleviate the shaking of the building, but due to unexpected strong earthquakes or damage to the seismic isolation device 2, the seismic isolation device 2 will not work effectively. , if there is a large deviation between the upper and lower surfaces,
Buildings may collapse. The height of the seismic isolation device 2 decreases due to the load of the building on the steel frame 3 according to the deviation between the upper and lower surfaces, and in the embodiment of the present invention,
As shown in Figures 5 and 6, as a result of the ground movement in the direction of the arrow X due to the earthquake, the seismic isolation device 2' is displaced between the upper and lower surfaces, and the relative position between the foundation 1' and the steel frame 3 is 25cm deviation
As shown by the imaginary line in Fig. 6, the steel frame frame 3', which has sunk due to the displacement of the seismic isolation device 2', is placed on the support frame 13', which has moved due to the shaking of the ground. The building is therefore safely supported on the support frame 13'.

Furthermore, in addition to such an earthquake, if there is abnormally strong wind such as a typhoon, the building placed on the seismic isolation device 2 will shake, which may cause residents to feel uneasy. Therefore, when weather information indicates that strong winds such as a typhoon are expected to occur, the steel frame trestle should be
If a wedge 16 is driven between the steel frame frame 3 and the support frame 13, and a pin 17 is dropped from above into the small hole 14 of the steel frame frame 3 and the small hole 15 of the support frame 13, the steel frame frame 3 and the building that is its upper structure will be attached to the support frame 13. In other words, the seismic isolation device 2 is locked and there is no possibility of the building shaking due to abnormally strong winds. Note that this fail-safe mechanism is not locked at all times, and the seismic isolation device 2 is kept in a state in which it works effectively.

The above-mentioned seismic isolation building makes effective use of the parallel chord truss 4 and enables the adoption of the seismic isolation device 2 in wooden houses.
This allows the entire building, including the floor structure, to be in a good seismic isolation state, which not only improves the safety of the entire building, but also prevents damage and injury caused by falling furniture, etc., and protects valuable property and artwork. It is possible to protect goods, etc. from earthquakes and to make the floor structure of a wooden house more comfortable to use. In addition, even in the unlikely event that the seismic isolation device 2 does not work effectively, the building can be safely supported by the support frame 13 as a fail-safe mechanism, and furthermore, the building can be prevented from shaking due to abnormally strong winds such as a typhoon. can be prevented.

〔Effect of the invention〕

This invention uses a steel frame trestle as a support that is erected on a foundation with the intervention of a seismic isolation device, and a long parallel chord truss is erected between two sides of this steel frame with this interval as a span, and also has a fail-safe structure. As a mechanism, a support pedestal is provided between the foundation near the seismic isolation device and the steel frame pedestal, and the support pedestal is lockable to the steel frame, resulting in the following effects.

(1) Since the seismic isolation floor structure does not require the construction of a large number of floor scaffolds laid at intervals on the ground, each of which is erected in the upper right corner, unlike the conventional structure, the cost is low and construction can be carried out easily and quickly.

(2) In the event of an earthquake, the vibrations caused by the earthquake are absorbed by the seismic isolation device, and the seismic force exerted on the building is greatly alleviated, making it possible to prevent the building from collapsing and to ensure the safety of household goods in the house. can be secured.

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

(4) Furthermore, the support frame as a fail-safe mechanism can be easily constructed.

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

[Brief explanation of the drawing]

Embodiment Fig. 1 is a side view of the main part of the 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 diagram of the parallel chord truss part in the same structure. Figure 4 is a plan view of the steel frame to explain the seismic isolation device and support frame installed on the lower surface of the main part of the structure, Figure 5 is a perspective view to explain the action of the support frame, and Figure 6 is a Similarly, FIG. 7 is a side view for explaining the function of the support frame, FIG. 7 is a cross-sectional view taken along the line ■-■ in FIG. 2, and FIG. 8 is a perspective view for explaining the floor structure of a conventional wooden house. l...Foundation 2...Seismic isolation device 3...Steel frame 4...Parallel chord truss 13・・・・・・・・・Support frame

Claims (1)

[Scope of Claims] 1. A seismic isolation device is installed at key points in the foundation of a wooden building such as a wooden house, and a steel frame frame is erected in a series on the seismic isolation device,
A seismic isolation floor structure is provided in which a wooden parallel chord truss is installed between the opposing steel frames, and the required height is maintained lower than that of the seismic isolation device, and the building is supported when the building shifts by a predetermined distance or more. A seismic isolation building equipped with a fail-safe mechanism in which a support frame capable of supporting the seismic isolation device is fixed on a foundation near the seismic isolation device. 2. A seismically isolated building equipped with a fail-safe mechanism according to claim 1, wherein the support pedestal is disposed obliquely to the laying direction of the foundation and is fixed to the foundation at a position where it intersects with the foundation. 3. A seismic isolation building equipped with a fail-safe mechanism according to claim 1 or 2, wherein the support pedestal is lockable to the steel frame pedestal.