JP3178390B2 - Building seismic isolation foundation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation base for a building which supports a detached house-scale building.

[0002]

2. Description of the Related Art The base of a seismic isolation building of a detached house scale is, for example, when the seismic isolation device is a rolling bearing using a ball bearing, the foundation is horizontal with respect to the foundation of the seismic isolation device that moves with the building. Since it is necessary to anticipate relative movement in two directions, it is constructed as a mat slab having an area covering the entire surface of the building. In this case, in order to reinforce the bending moment received by the slab, the plate thickness at the installation position of the seismic isolation device is increased, or a beam shape connecting the portions is formed.

[0003] Since the construction of the mat slab requires the entire excavation of the ground, there is a disadvantage that the amount of root cutting and the amount of concrete used are large, which increases the cost and prolongs the construction period. In particular, the disadvantage becomes significant because the plate thickness must be increased.

A space for the maintenance of the seismic isolation device is formed between the base of the base of the seismic isolation building and the foundation, but the space must be secured from the top end of the mat slab, so that the floor height of the first floor is required. Becomes large, and it becomes necessary to install a stair having a height corresponding to the height between the ground surface and the entrance of the building.

When the seismic isolation device is a laminated rubber bearing, an independent foundation may be constructed at the installation position when installing the seismic isolation device, but the independent foundation is used to prevent uneven settlement between the independent foundations. Because they are connected by beams, digging and the use of a corresponding amount of concrete are required. In addition, since the foundation beams arranged in a grid form block the path to the independent foundation, the space for maintenance must be secured from the top end of the foundation beams, the same as in the case of mat slabs .

In view of the above background, the present invention proposes a foundation for a structure that eliminates disadvantages of a foundation for a seismically isolated building of a detached house scale.

[0007]

According to the present invention, a pile partially constructed or installed in the ground, a footing integrated with the pile and a top end located above the original ground surface, and installed on the footing The seismic isolation base is constructed from the seismic isolation device that supports the building, the foundation is partially placed under the building in the independent foundation form, and the top of the footing is exposed, and the amount of root cutting and the use of concrete are used. Reduce the amount, reduce costs and shorten the construction period.

In the case of a direct foundation, a difference in the supporting force as a foundation may occur depending on the degree of compaction of the ground surface below the bottom of the foundation, but in the present invention, since the foundation is a pile foundation, the stability of each independent foundation can be stabilized. The bearing capacity is obtained, and there is no need to connect the independent foundations with foundation beams.

In the case of a direct foundation, it is necessary to increase the footing area on soft ground. However, when the object is a house or the like, the upper structure is lightweight. As described, by constructing a pile from a soil cement pile constructed by stirring and mixing excavated soil and solidified material as described, a constant bearing capacity can be obtained even on soft ground without expanding the scale of the pile Therefore, it is not necessary to increase the footing area, and it is possible to obtain a necessary supporting force with a fixed-scale foundation regardless of the ground conditions.

[0010] As a result, the footing can be standardized to a certain size by selecting the stake. Therefore, it is possible to convert the footing into precast concrete as described in claim 3 and to commercialize the footing in advance. Will be possible. In this case, since the foundation can be completed only by fastening the footing to the anchor bolt fixed to the pile at the site, labor on the site can be saved.

The space under the floor for maintenance may be secured above the ground surface or below the floor, and is secured below the floor because the foundation is partially arranged under the building and cannot be connected with the foundation beams. In this case, a space can be formed by removing the surface soil from the outer periphery of the building in a groove shape, so that it is not necessary to increase the floor height of the first floor while securing a space for maintenance, and the number of steps can be reduced.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A seismic isolation foundation according to the present invention is integrated with a pile 1 which is partially constructed or installed in the ground under a building, and which is constructed or installed on the pile 1 and integrated with the pile 1. A footing 2 whose top end is located above the original ground surface, and a seismic isolation device 5 installed on the footing 2 and supporting the building, are partially arranged below the building.

The pile 1 is constructed by installing a ready-made pile, a cast-in-place concrete pile, and a soil cement pile constructed by stirring and mixing excavated soil and solidified material. In the drawing, one pile from four soil cement piles
However, the pile 1 may be constituted by one soil cement pile as long as the pile 1 has an area capable of supporting the footing 2. The cross section of the soil cement pile is not limited to a circle but may be a rectangle.

The soil cement pile is excavated into the ground with a drilling claw at the tip and a drilling claw of a drilling rod having an agitating blade at an intermediate portion in the axial direction. It is constructed by stirring and mixing of the solidified material and excavated soil with the stirring blade.

After the pile 1 is installed or constructed, an anchor bolt 3 for securing integrity with the footing 2 is embedded in the head of the pile 1 and fixed. When the pile 1 is a cast-in-place concrete pile or a soil cement pile, the anchor bolt 3 is driven before the pile 1 is hardened, and is fixed by the hardening. In the case of a ready-made pile, the anchor bolt 3 is fixed by welding or by piercing and filling with a filler.

The footing 2 is constructed by assembling a formwork and a reinforcing bar on the pile 1 and pouring concrete, and is also installed on the pile 1 as a precast slab. Fixed. When the concrete is hardened when it is constructed on site, or when it is precast, it is fixed by fastening the nut 4 to the anchor bolt 3 after dropping it on the pile 1.

After the footing 2 is fixed, the seismic isolation device 5 is installed on the footing 2. Although the drawing shows the case where the seismic isolation device 5 is a rolling bearing using the ball bearing 71, the seismic isolation device 5 may be a laminated rubber bearing or a sliding bearing.

In the case of a rolling bearing, a bottom plate 6 for rolling a ball bearing 71 is fixed to the top end surface of the footing 2, and a bearing body 7 having the ball bearing 71 built therein is fixed thereon.
Is installed so that it can roll freely. The upper end of the support body 7 is fixed to the bottom surface of a floor frame 8 such as a base or a large-size floor, which is a bottom surface of the building.
In the case of a laminated rubber bearing, the lower end is fixed to the footing 2 and the upper end is fixed to the floor frame 8. The drawing shows a case where the floor frame 8 is a steel frame.

The footing 2 is connected or fixed to a damper 9 for suppressing an increase in the shaking of the building. The drawing shows a case where the damper 9 is a viscous damper containing a viscous fluid such as oil, but the type of the damper 9 is not limited and a steel damper may be used. When the damper 9 is a viscous damper, one end of the damper 9 is connected to the footing 2 and the other end is connected to the floor assembly 8. The manner of connection between the damper 9 and the footing 2 or the floor assembly 8 is determined by the type of the damper 9.

A space 10 for the maintenance of the seismic isolation device 5 and the damper 9 is secured under the floor structure 8. However, when the floor height of the first floor is reduced, the space 10 is used as shown in FIG. It is formed by removing surface soil under the floor. In this case, a sheet 11 such as a vinyl sheet for waterproofing is laid on the root cutting surface facing the space 10, and a slab or other plate material 12 is laid on the sheet 11 in consideration of entry and exit of people. When the floor height of the first floor may be increased, a space 10 may be secured on the original ground surface.

In FIG. 1, reference numeral 13 denotes an outer wall, 14 denotes a concrete block that blocks under the floor except for a maintenance space 10, and 15 denotes a stair.

[0022]

According to the present invention, a pile partially constructed or installed in the ground, a footing integrated with the pile, the top end of which is positioned above the original ground surface, and a footing installed on the footing to support the building. Since the seismic isolation base is composed of seismic devices and the foundation is partially placed under the building in the form of an independent foundation, the amount of root cutting and the amount of concrete used are reduced, thereby reducing costs and shortening the construction period.

Further, since the pile foundation is used, a stable supporting force of each independent foundation can be obtained, and there is no need to connect the independent foundations with foundation beams.

According to the third aspect of the present invention, since a fixed bearing force can be obtained by using a soil cement pile constructed by stirring and mixing the excavated soil and the solidified material as a pile, the footing can be applied to soft ground. There is no need to increase the area.

For this reason, in the first aspect, it is possible to standardize the footing to a certain size by selecting the pile. In the fourth aspect, since the precast concrete slab is used for the footing, the The foundation can be completed only by fastening the footing to the anchor bolts anchored on the floor, and labor on site can be saved.

The space for maintenance under the floor may be secured above the ground surface or below the floor because the foundation is partially arranged below the building. Since the space can be formed by removing the surface soil in a groove shape from, there is no need to increase the floor height of the first floor while securing the space for maintenance,
The number of steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a relationship between a seismic isolation device, a foundation, and a building.

FIG. 2 is a plan view showing a state where a seismic isolation device is installed on a pile.

[Explanation of symbols]

1 ... pile, 2 ... footing, 3 ... anchor bolt,
4 ... nut 5 ... seismic isolation device 6 ... bottom plate 7 ... bearing body 71 ... ball bearing 8 ... floor assembly 9 ...
Damper, 10 ... space, 11 ... sheet, 12 ... board, 13 ...
… Outer wall, 14 …… concrete block, 15 …… stairs.

Continuation of the front page (56) References JP-A-9-165757 (JP, A) JP-A-1-207530 (JP, A) JP-A-10-37212 (JP, A) JP-A-10-252311 (JP) JP-A-9-137457 (JP, A) JP-A-7-238557 (JP, A) JP-A-3-76929 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) E02D 27/00

Claims (4)

(57) [Claims] 1. A seismic isolation base for supporting a house-scale building, wherein the pile is partially constructed or installed in the ground below the building, and integrated with the pile, and the top end is above the original ground surface. And a seismic isolation device installed on the footing and supporting the building. 2. A space for maintenance is provided on an original ground surface.
The seismic isolation foundation of a building according to claim 1, or secured below the floor. 3. The seismic isolation foundation of a building according to claim 1, wherein the pile is constituted by a soil cement pile constructed by stirring and mixing excavated soil and solidified material. 4. The base isolation base for a building according to claim 1, wherein the footing is made of precast concrete.