JPH08338033A - Vibration isolation footing - Google Patents

Abstract

PURPOSE: To make it possible to use a vibration isolation footing for a small- sized construction such as a wooden house, etc., and to provide the vibration isolation footing capable of being executed simply at a low cost. CONSTITUTION: An erection member 2 (vibration isolation device bearing body) is fixed to a precast concrete slab 1 mounted on the ground. A laminated rubber bearing 3 (vibration isolation device) is mounted to the upper surface of the erection member 2, and a frame body 4 is bone thereon. The frame body 4 is constituted of precast concrete or shape-steel, etc., and wooden house, etc., are constructed thereon. Additional members can be mounted to the frame body 4 in accordance with construction, room layout, etc. By such constitution, the vibration isolation device is easily mounted, and dust proofing treatment/ maintenance inspection can be easily executed. The reduction of a construction period and a construction cost can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a foundation of a structure constructed on the ground such as a building, and is capable of avoiding the propagation of a large earthquake motion from the ground to an upper structure during an earthquake. Related to seismic foundations, especially seismic isolation foundations suitable for small-scale structures.

[0002]

2. Description of the Related Art Japan is a country where earthquakes frequently occur, and buildings and civil engineering structures must be designed to withstand large earthquakes. For this reason, several design methods for earthquake motion have been proposed, and one of them is a structure in which the energy of large earthquake motion is not transmitted to the upper structure, that is, a seismic isolation structure.

In this seismic isolation structure, an upper structure is constructed to allow relative displacement with respect to a foundation provided on the ground, and when the relative displacement occurs, the upper structure is constructed. It has a function of applying a restoring force to return the original position to the original position and a function of damping the vibration of the upper structure.

As a structure that allows the relative displacement as described above, there is known a structure that supports the upper structure through, for example, laminated rubber or a slide bearing. The laminated rubber also has a function of giving a restoring force, and it is possible to give a damping function by embedding a core material of a flexible metal such as lead. Further, as another example of the device that provides the restoring function, a device that uses a spring is known, and as the device that provides the damping function, there is a device that uses a viscous fluid.

The foundation for making such a seismic isolation structure has been adopted as a foundation for a large-scale or medium-scale multi-layered structure until now, but in the Hyogoken-Nanbu Earthquake, there are many cases of collapse of wooden houses. , It is desirable to adopt seismic isolation foundations for such small-scale structures so that they will not collapse even against extremely strong earthquake motion.

[0006]

However, when the seismic isolation foundation as described above is applied to a small-scale structure such as a wooden house, there are the following problems. The foundation must be divided into a part that directly supports the upper structure and a part that is fixedly supported on the ground, and a structure that allows relative displacement between these two parts must be constructed, and the shape etc. is complicated. Therefore, it requires a lot of work for construction. Further, the seismic isolation device and the like are small in size because the weight of the upper structure is small, but a plurality of seismic isolation devices must be installed, and it takes a lot of time to install them accurately. Therefore, the construction period becomes long and the construction cost increases.

The present invention has been made in view of the above problems, and an object thereof is to provide a base isolation base for a small-scale structure which is inexpensive and can be easily constructed.

[0008]

In order to solve the above problems, a seismic isolation foundation according to the invention of claim 1 is a precast concrete plate or a precast concrete frame placed on the ground, A seismic isolation device supported by a precast concrete plate or a precast concrete frame body, and a frame body mounted on the seismic isolation device and supporting a building.

The invention according to claim 2 is the seismic isolation foundation according to claim 1, wherein the seismic isolation device is a precast concrete board or precast concrete through an seismic isolation device support body which is a precast concrete member. It shall be fixed to the frame.

The invention according to claim 3 is the seismic isolation foundation according to claim 1 or 2, wherein the precast concrete plate or the precast concrete frame is formed by joining a plurality of standardized members. Shall be.

In the seismic isolation base according to claim 1, the seismic isolation device is suitably selected from among those using laminated rubber, those using slide bearings, those supporting the upper structure through rolling elements, etc. It can be selected and adopted. Further, the seismic isolation device may be directly fixed to the precast concrete plate or the precast concrete frame, or to the precast concrete plate or the precast concrete frame through another member such as concrete or steel. It may be fixed.

As the frame body, in addition to the one made of precast concrete, one using a steel material, one obtained by combining these, and the like can be adopted. In addition to the rectangular shape of this frame, an intermediate member is added to the inside of the rectangular frame depending on the planar structure of the upper structure constructed on it, one with an overhanging part, and one part horizontal. It may be a plate-shaped member in the direction.

In the seismic isolation apparatus according to the third aspect of the present invention, the standardized shapes and sizes of the members can be combined to construct a foundation of any shape, and various floor plans and flat structures can be constructed. It is desirable to set it so that it can be built. Further, for joining these members, existing methods such as a method using a bolt and a nut and a method of tightening a plurality of members using a PC steel material can be adopted.

[0014]

In the seismic isolation foundation according to claim 1, the precast concrete plate or the precast concrete frame is placed on the ground, and the weight of the upper structure is transmitted to the ground through these members. The ground reaction force per hit is small, and the ground is soft and can be used as a foundation without uneven settlement. Further, since the precast member is used, the work at the site can be reduced, the construction period can be shortened, and the construction cost can be reduced. Further, since the seismic isolation device is supported by the precast member, the seismic isolation device can be attached in advance in a factory or a manufacturing yard so as to be integrated with the precast member. Therefore, the work of mounting while adjusting the position on the site is simplified. Also, since the member that is placed on the seismic isolation device and that supports the upper structure is a frame, it is easy to use the underfloor space and pipe water, gas, etc., as with conventional cloth foundations. Is possible. Further, it is possible to easily install the seismic isolation device, dustproof measures, and maintenance and inspection.

In the seismic isolation foundation according to claim 2, since the seismic isolation device is supported via the seismic isolation device support, it is necessary to deeply embed the foundation depending on the condition of the ground or the height of the foundation. Even if you have to increase
This can be easily dealt with by appropriately setting the height of the seismic isolation device support. Further, since the seismic isolation device support is a precast concrete member, the seismic isolation device can be pre-installed at a factory or the like, and work at the site can be made efficient.

In the seismic isolation foundation according to claim 3, since the precast concrete plate or the precast concrete frame placed on the ground is constructed by joining a plurality of standardized members, the seismic isolation foundation is used. By selecting the number and size of the members to be joined depending on the plane configuration of the upper structure constructed above, the floor plan, the arrangement of various facilities, etc., it becomes possible to easily construct the foundation of any shape and size.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view showing a seismic isolation base which is an embodiment of the invention described in claim 1 or 2. Further, FIG. 2 is a sectional view of the same seismic isolation foundation. This seismic isolation foundation includes a footing plate 1 (precast concrete plate) placed on the ground, a rising member 2 (seismic isolation device support) fixed to the upper surface of the footing plate 1, and the rising member. Two
The laminated rubber bearing 3 fixed to the top of the laminated rubber bearing 3 and the frame 4 placed on the laminated rubber bearing 3 constitute a main part.

The footing board 1 is a precast concrete member manufactured in a factory or the like, and is divided into a plurality of pieces so that they can be easily transported and carried into a construction site. These are joined in the field and integrated by introducing prestress. This footing board 1 may be directly placed on a flat ground, but as shown in FIG. 2, it is installed after laying the split stones 5 and placing the leveling concrete 6 or the leveling mortar. It is desirable to do.

The rising member 2 is also a precast member manufactured in a factory or the like and has a substantially channel-shaped cross section. This member is divided into a plurality of pieces and manufactured, and assembled on the footing plate 1 into a rectangular frame shape. As shown in FIG. 3, the rising member 2 is configured such that an anchor bolt 9 embedded in the footing plate 1 is inserted into a bolt hole provided in advance, and is tightened and fixed by a pressure bearing plate 10 and a nut 11. There is.

The laminated rubber bearing 3 is formed by alternately laminating neoprene rubber and metal reinforcing plates and adhering them. The shear displacement of the neoprene rubber causes the horizontal displacement of the upper structure and the compression deformation of the neoprene rubber. Vertical displacement is allowed. Then, the elastic repulsive force of the rubber gives a restoring force. Further, a lead core material is put in the center of the laminated rubber bearing 3, and the vibration of the upper structure is attenuated by the deformation of the core material. If the size of the bearing is small and a lead core cannot be inserted, it is desirable to provide a damping mechanism using a viscous fluid or the like.

The frame 4 is made of precast concrete, and prestress is introduced as necessary. As shown in FIG. 2, a base 7 of a wooden house is fixed to the upper surface of the frame 4, and columns 8 are erected on the base 7 to construct a frame structure. The frame body shown in FIG. 1 is a simple rectangle, but the frame body shown in FIG.
The connecting member 4C may be provided by using an intermediate member 4b for connecting the facing members or a shaped steel (H-shaped steel, I-shaped steel, etc.) as shown in FIG.

FIG. 5 is a schematic perspective view showing a seismic isolation base which is an embodiment of the invention described in claim 3. In addition, FIG.
[Fig. 3] is a plan view and a cross-sectional view of the same seismic isolation foundation. This seismic isolation foundation was interposed between a footing frame 21 in which a plurality of standardized precast concrete frames were joined, an upper frame 23 in which the same precast concrete members as this footing frame were joined, and between these. The seismic isolation device 22 and the main part are configured.

The footing frame 21 and the upper frame 23
Is constructed by joining a precast concrete frame having a square outer frame with a side of 1.8 m.
Adjacent frames are joined by 4. Each precast concrete frame is provided with an intermediate member in the shape of a "square", and a seismic isolation device is fixed at the center of each frame. As shown in FIG. 7, this seismic isolation device uses a so-called linear slide, and includes a lower plate 22a fixed to the footing frame, a lower rail 22b fixed to the lower plate 22a, and an upper frame. Upper plate 22f
And an upper rail 22e fixed to the upper plate in a direction perpendicular to the lower rail, and both of the lower rail 22b and the upper rail 22e are engaged with each other to reduce the gravity of the upper structure to the lower rail 22b. The main part is constituted by the intermediate support 22c that is transmitted to the ground via the rail and is movable in the axial direction of each rail. A large number of small balls are held between the intermediate support 22c and the rail, and by rolling them, the intermediate support 22c can move on the rail with an extremely small force. The upper frame 23 can be displaced in any direction by interposing the intermediate supports 22c so that they can move on the upper and lower rails arranged at right angles to each other.

As the seismic isolation device, in addition to the above-mentioned ones, various structures such as a spherical plate 32b interposed between a lower plate 32a and an upper plate 32c as shown in FIG. 8 can be adopted. . Moreover, since these seismic isolation devices do not have a function of giving a restoring force and damping, it is desirable to provide a restoring mechanism and a damping mechanism separately. With the seismic isolation foundation having the above-described structure, it can be constructed at a low cost in a short construction period. As shown in FIG. 6 (b), the base 27 is fixed and the pillar 28 is erected on the upper frame of the seismic isolation foundation. You can easily build a wooden house by installing it.

[0025]

As described above, in the seismic isolation foundation according to claim 1, the upper structure such as a wooden house is directly supported by the frame, and the frame is relatively supported with respect to the ground. The displacement is allowed to prevent large earthquake motions from propagating to the upper structure. Also, since the main part is made of precast concrete, it can be constructed by manufacturing each member in a factory etc., bringing it to the site and assembling it, shortening the construction period and improving the work efficiency on site. Therefore, even a small-scale foundation can be constructed with a low construction cost. Furthermore, since the member that supports the upper structure is a frame, the same structure and method as when building a wooden house on a conventional cloth foundation can be adopted, and the use of underfloor space and water supply The piping for gas etc. can be easily performed. Also,
Installation of seismic isolation devices, dustproof measures, maintenance and inspection will be easy.

In the seismic isolation base according to claim 2, since the seismic isolation device is supported by the seismic isolation device support, it is necessary to deeply embed the foundation depending on the condition of the ground or the height of the foundation. Even if you have to increase
This can be easily dealt with by appropriately setting the height of the seismic isolation device support. Further, since the seismic isolation device support is a precast concrete member, the seismic isolation device can be pre-installed at a factory or the like, and work at the site can be made efficient.

In the seismic isolation base according to claim 3, since the precast concrete plate or the precast concrete frame placed on the ground is constructed by joining a plurality of standardized members, By selecting the number and size of the members to be joined depending on the plane configuration of the upper structure constructed above, the floor plan, the arrangement of various facilities, etc., it becomes possible to easily construct the foundation of any shape and size.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a seismic isolation base which is an embodiment of the invention according to claim 1 or claim 2. FIG.

FIG. 2 is a sectional view of the seismic isolation foundation shown in FIG.

FIG. 3 is a partially enlarged sectional view of the base isolation foundation shown in FIG.

FIG. 4 is a plan view showing another example of a frame body that can be used in place of the frame body included in the seismic isolation foundation shown in FIG. 1.

FIG. 5 is a schematic perspective view showing a seismic isolation base which is an embodiment of the invention described in claim 3.

6 is a plan view and a cross-sectional view of the seismic isolation foundation shown in FIG.

7 is a diagram showing a seismic isolation device used in the seismic isolation foundation shown in FIG.

8 is a diagram showing another example of the seismic isolation device used in the seismic isolation foundation shown in FIG.

[Explanation of symbols]

 1 Footing board (precast concrete board) 2 Standing member (seismic isolation device support) 3 Laminated rubber support (seismic isolation device) 4 Frame 5 Split quarry stone 6 Leveling concrete 7 Base 8 Pillar 9 Anchor bolt 10 Bearing plate 11 Nut 21 Footing Frame 22 Seismic Isolation Device 23 Upper Frame 24 Bolt 25 Split Kuriishi 26 Leveling Concrete 32 Seismic Isolation Device

Claims (3)

[Claims] 1. A precast concrete plate or precast concrete frame placed on the ground, a seismic isolation device supported by the precast concrete plate or precast concrete frame, and placed on the seismic isolation device, A seismic isolation foundation having a frame body that supports a building. 2. The seismic isolation base according to claim 1, wherein the seismic isolation device is fixed to the precast concrete plate or the precast concrete frame body via a seismic isolation device support body which is a precast concrete member. A seismic isolation device characterized in that 3. The seismic isolation foundation according to claim 1 or 2, wherein the precast concrete plate or the precast concrete frame is formed by joining a plurality of standardized members. Base isolation.