JP3820517B2 - Seismic isolation structure of building - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation structure for a building that is low in cost, good in workability, and easy in maintenance and excellent in earthquake resistance.
[0002]
[Prior art]
Conventionally, as shown in FIG. 4, the seismic isolation structure of a building is provided with a pit-shaped seismic isolation layer 19 over the entire lower surface of the building 1, and a person who performs maintenance of the seismic isolation device 8 is provided by Was able to move easily inside.
[0003]
[Problems to be solved by the invention]
However, in such a structure in which the pit-shaped seismic isolation layer 19 is provided over the entire lower part of the building 1, a slab and a foundation beam are added to the lower part of the seismic isolation layer 19, and the ground surface 17 becomes deeper. It was a cost increase factor.
[0004]
In view of the above circumstances, an object of the present invention is to provide a seismic isolation structure for a building that is low in cost, has good workability, and is easy to maintain and has excellent seismic performance.
[0005]
[Means for Solving the Problems]
The seismic isolation structure for a building according to claim 1 is a structure in which a seismic isolation device is arranged on a pile head of a pile foundation, and an upper structure of the building is constructed on an upper surface of an upper flange of the seismic isolation device. In the seismic isolation structure, the outer periphery of the seismic isolation device has a pit that has been drilled to have a width that allows the human head to be inspected at a depth at which the pile head is exposed for each pile foundation. It is provided, The bottom part of the said pit is constructed with the abandoned concrete or dirt concrete, and the side wall part is constructed with sprayed concrete.
[0007]
The seismic isolation structure for a building according to claim 2 , wherein the horizontal movable space provided in an underground outer peripheral portion of the building forms a dog slab provided so as to protrude in a horizontal direction from the outer peripheral surface of the building. The mountain retaining wall provided so as to surround the area of the building is used as an underground outer wall and is provided along the inner peripheral surface of the mountain retaining wall.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the seismic isolation structure of the building which concerns on this invention is explained in full detail using FIGS. 1-3. The seismic isolation structure for a building according to the present embodiment is a structure in which individual pits are provided around a pile head that supports the building, and the pits are used as an inspection space for the seismic isolation device.
[0012]
As shown in FIG. 1 (a), in the area where the building 1 surrounded by the mountain retaining wall 2 is constructed, the ground is excavated to a predetermined depth so that the column base can be embedded, and the ground surface 17 is excavated. Abandoned concrete 6 is placed in the slab, and a plurality of pits 4 are formed by excavation with a certain distance. The piling surface of the pit 4 is treated with shotcrete 5, and the pile foundation 3 is disposed with the pile head exposed at the center of the bottom, and soil concrete 7 is disposed around the pile foundation 3. It has been cast. As shown in FIG. 2, the pit 4 is provided to perform maintenance work of the seismic isolation device 8 provided later on the head of the pile foundation 3. The size is as large as possible.
[0013]
In this way, the pile foundations 3 arranged in the plurality of pits 4 provided at regular intervals are arranged in an independent state without being connected by underground beams or the like. The seismic isolation device 8 is placed on the part. The pile foundation 3 that is not connected by underground beams will cause a maximum rotation angle at the time of pile head pin in the seismic isolation device 8, but in any ground as long as no large-scale liquefaction phenomenon occurs In addition, it has been analytically confirmed that the rotation angle during pile head pin can be suppressed to 1/100 or less.
[0014]
On the other hand, it is known that the laminated rubber generally used as the seismic isolation device 8 does not affect the hysteresis performance even if the upper and lower flange surfaces are inclined about 1/100. Therefore, in the present embodiment, laminated rubber is used for the seismic isolation device 8.
The seismic isolation device 8 is not limited to laminated rubber, and any seismic isolation device 8 that does not affect the hysteresis performance even when the upper and lower flange surfaces are inclined by about 1/100 may be used.
[0015]
On the upper surface of the seismic isolation device 8, a column 10 having a footing 9 provided on a column base is erected. The adjacent pillars 10 are connected to each other by a connecting beam 11, and the superstructure of the building 1 is constructed using these.
By the way, since the building 1 is greatly displaced in the horizontal direction by the seismic isolation device 8 at the time of an earthquake, the connection beam 11 and the lower surface of the connection beam 11 are close to each other as shown in FIG. It is necessary to be insulated from the discarded concrete 6 provided on the ground surface 17.
[0016]
For this reason, as shown in FIG. 1 (b), when the connecting beam 11 located immediately above the abandoned concrete 6 is constructed, a lower mold 18 using a biodegradable plastic is prepared in advance on the bottom surface. Then, the lower mold 18 is placed on the discarded concrete 6 at a desired position where the connecting beam 11 is to be provided, and the connecting beam 11 is placed in the concrete using the mold 18. As a result, the lower mold 18 is decomposed into water vapor and carbon dioxide and disappears after several months. Therefore, the removal provided on the connecting beam 11 and the ground surface 17 is not performed without removing the lower mold 18. The concrete 6 can be insulated.
[0017]
On the other hand, the building 1 is constructed by providing a certain gap with the mountain retaining wall 2 as shown in FIG. This gap is a horizontal movable space 12 provided to prevent the building 1 that behaves in the horizontal direction by the seismic isolation device 8 when an earthquake or the like occurs from colliding with the mountain retaining wall 2.
[0018]
The horizontal movable space 12 is covered with a dog run 13 composed of an overhanging slab provided so as to protrude outward from the entire outer peripheral surface of the building 1 so as not to be exposed to rain. That is, the horizontal movable space 12 is formed on the entire outer peripheral portion of the building 1 surrounded by the outer peripheral surface of the building 1, the inner peripheral surface of the mountain retaining wall 2, and the dog run 13. It becomes space.
A cantilever slab may be provided between the outer peripheral column of the building 1 and the outer wall surface instead of the dog run 13.
[0019]
As shown in FIG. 1A and FIG. 3, a hatch 14 is provided on the floor 15 located above the pit 4 near the pillar 10 on the lowest floor of the building 1. The hatch 14 is an access port for an operator to enter and exit the pit 4 in order to perform maintenance of the seismic isolation device 8. When the hatch 14 is opened, a ladder 16 for descending to the pit 4 is provided. Is provided.
[0020]
According to the above-described configuration, by providing the pits 4 on the outer periphery of the pile foundation 3, it is possible to perform a personal inspection of the seismic isolation device 8 provided on the pile head. Compared to the structure in which pits are provided in the entire seismic isolation layer 19 as used, the amount of ground excavation can be reduced, the ground surface 17 can be raised, and a large amount of excavated soil can be prevented. In addition, the construction period can be shortened and the operation cost can be greatly reduced.
[0021]
The pits 4 provided on the outer periphery of the pile head of the pile 3 are constructed with soil concrete 7 on the bottom surface and sprayed concrete 5 on the slope surface. Can be rationalized, and the cost can be greatly reduced.
[0022]
Since the horizontal movable space 12 of the building 1 uses the retaining wall 2 as an underground outer wall as it is, the work process can be reduced as compared with a conventional seismic isolation structure in which an RC wall is newly provided as an underground outer wall. It becomes possible, and the cost can be greatly reduced. In addition, spray concrete and RC wall can also be provided inside the mountain retaining wall 2 as needed.
[0023]
Since a hatch 14 is provided on the floor 15 of the lowest floor of the building 1 and can enter and exit from the hatch 14 to the pit 4 provided on the outer periphery of each pile foundation 3, a pit layer is provided in the entire seismic isolation layer. This is not necessary, and the construction process is greatly shortened and the cost can be greatly reduced.
[0024]
【The invention's effect】
According to the seismic isolation structure of a building according to claim 1, the seismic isolation device is arranged on the pile head of the pile foundation, and the upper structure of the building is constructed on the upper surface of the upper flange of the seismic isolation device. In the seismic isolation structure for objects, the outer periphery of the seismic isolation device was drilled to have a width that allows human inspection at a depth at which the pile head is exposed for each pile foundation. Since the pits are provided, it is possible to prevent a large amount of excavated soil from being discharged, shorten the work period, and greatly reduce the work cost.
[0025]
Moreover, since the bottom part of the pit is constructed with abandoned concrete or dirt concrete and the side wall part is constructed with sprayed concrete, the construction is easy and the work efficiency is good, and the reinforcement work can be rationalized. And cost can be greatly reduced.
[0026]
According to the building seismic isolation structure according to claim 2, the horizontal movable space provided in the underground outer peripheral portion of the building forms a dog run provided so as to protrude in the horizontal direction from the outer peripheral surface of the building. A mountain retaining wall that is covered with a horizontal slab and that surrounds the area of the building is used as an underground outer wall, and is provided along the inner peripheral surface of the mountain retaining wall. Compared with the conventional seismic isolation structure in which the RC wall is provided, it is possible to reduce the work process and to greatly reduce the cost.
[Brief description of the drawings]
FIG. 1 is a diagram showing details of a seismic isolation structure for a building according to the present invention.
FIG. 2 is a diagram showing details of a pit in a building seismic isolation structure according to the present invention.
FIG. 3 is a diagram showing the floor surface of the lowest floor of the building according to the present invention.
FIG. 4 is a diagram showing an outline of a conventional building seismic isolation structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Building 2 Mountain retaining wall 3 Pile foundation 4 Pit 5 Shotcrete 6 Abandoned concrete 7 Concrete between soils 8 Seismic isolation device 9 Footing 10 Pillar 11 Linkage 12 Horizontal movable space 13 Dog run 14 Hatch 15 Floor 16 Ladder 17 Ground 18 Formwork 19 Seismic isolation layer

Claims (2)

In the seismic isolation structure of the building in which the seismic isolation device is arranged on the pile head of the pile foundation and the upper structure of the building is constructed on the upper surface of the upper flange of the seismic isolation device,
On the outer periphery of the seismic isolation device, a pit that has been dug so as to have a width that allows human inspection at a depth at which the pile head is exposed for each pile foundation ,
A seismic isolation structure for a building, wherein a bottom portion of the pit is constructed with abandoned concrete or dirt concrete, and a side wall portion is constructed with sprayed concrete. In the seismic isolation structure of a building according to claim 1 ,
The horizontal movable space provided in the underground outer peripheral part of the building is covered with a horizontal slab forming a dog run provided so as to protrude in a horizontal direction from the outer peripheral surface of the building, and surrounds the area of the building A seismic isolation structure for a building, which is provided along an inner peripheral surface of the mountain retaining wall using a mountain retaining wall provided in the basement as an underground outer wall.

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