JP3715402B2 - Seismic isolation load exchange method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation load exchange method for installing a seismic isolation device that does not transmit severe earthquake motion to a building in order to protect a high-rise building from damage such as an earthquake.
[0002]
[Prior art]
Conventionally, when constructing a high-rise building, usually, a large number of foundation piles are driven into the ground, and when their tips reach a support layer such as bedrock, they are connected to each other. It was constructed by placing concrete as a pressure plate at a position and installing a seismic isolation device on this pressure plate, and the weight of the building was received by the pressure plate via the seismic isolation device.
When seismic motion occurs in such a state, even if the pressure plate sways, the seismic motion is absorbed by the seismic isolation device installed on the pressure plate, and the shaking caused by the seismic motion of the building is as fast and large as possible. A part is attenuated.
[0003]
[Problems to be solved by the invention]
The above-described high-rise building using the seismic isolation device is the best method for constructing a new structural building from now on, but has a problem that it cannot be applied to an existing high-rise building.
The present invention has been made in view of the above circumstances, a predetermined position in the circumferential edge of the foundation pile consuming load of the existing high-rise buildings, capable of laying the seismic isolation device according to the respective load seismic isolation It intends to propose a load exchange method.
[0004]
[Means for Solving the Problems]
To achieve the above object, the seismic isolation load受替example method of the present invention, outlined buildings driving a plurality of auxiliary pile to a predetermined position in the circumferential edge of the foundation pile of each of the upper side to the first of the auxiliary pile A support jack is attached to support the building, the foundation pile and the building are separated , a pressure plate is laid under the building, and the required number of second support jacks and oil jacks are placed on the pressure plate. On the other hand, after the seismic isolation device is brought into close contact with the building by the second support jack and the oil jack through the upper concrete support part formed between the seismic isolation device and the bottom of the building, and then the oil jack is removed, The second support jack is fixed to the pressure platen by the lower concrete support portion .
[0005]
[Action]
According to the seismic isolation load exchange method described above, it is possible to install a seismic isolation device at a specified position on the foundation pile or foundation surface without any damage to the existing building, and the existing building is constructed on the seismic isolation device. Safety management can be maintained in the same way as the newly constructed buildings.
In addition, when the oil jack is removed after the seismic isolation device is attached, it is easy to manage the load and the amount of displacement when the load is applied to the seismic isolation device, and a significantly superior building can be obtained.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a partial cross-sectional view showing the main part of the seismic isolation load exchange method, FIG. 2 is an oblique view of the appearance of a support jack used in the seismic isolation load exchange method, and FIG. 3 is a cross section showing an example of the seismic isolation device FIG.
[0007]
In the embodiment of FIG. 1, a foundation pile 2 supporting the building 1 is connected to the lower side of the existing building 1, but the structure shown in FIG. The one already cut off from the floor of object 1 is shown. Auxiliary piles 3L, 3R reaching the underground rock mass are provided on the left and right sides of the foundation pile 2, and first support jacks 4L, 4R are attached to the upper portions of these auxiliary piles 3L, 3R. It is installed to support the bottom part.
A pressure platen 5 is provided by connecting the lower part of the foundation pile 2 separated from the auxiliary piles 3L and 3R provided around the foundation pile 2, and the pressure platen 5 and the bottom of the building 1 Between them, a second support jack 7 and an oil jack 8 assembled between the jacks are arranged, and a seismic isolation device 9 is placed on the second support jack 7. The upper concrete support 6 is formed by pouring concrete, for example, in the gap between the bottom of the building and the bottom of the building, and the load of the building is supported via the upper concrete support 6.
In the drawing, the oil jack 8 is shown with a dotted line because it is removed in a work process described later. Further, a dotted line portion surrounding the second support jack 7 indicates that the support jack is fixed at the lower concrete support portion 10 in the final stroke.
[0008]
The first support jacks 4L and 4R have the shape shown in FIG. 2 and have a rectangular upper base plate 11 and a lower base plate 12, and straight pipes 13 are provided at four corners of the lower base plate 12. It is erected, and is screwed into the four corners of the upper base plate 11 to insert a screw 14 into the straight pipe 13.
Further, the second support jack 7 is provided with an increased number of straight pipes and screw rods for receiving a heavy load, and the above-mentioned support jack is supported by the applicant of the present invention for launching a heavy structure No. 1781316. The right is acquired as a device.
[0009]
These support jacks 4 and 7 both have the lower base plate 12 fixed, the upper base plate 11 side is pushed up by, for example, an oil jack 8 and the upper base plate 11 is pressed against the upper structure, and the nut 15 of the screw 14 is provided. And the nut 15 is in contact with the straight pipe 13 to fix the upper base plate 12. Even after the oil jack 8 is removed after the upper base plate 12 is fixed, the upper base plate 12 can support the upper structure by contact between the nut 15 and the upper side of the straight pipe 13.
[0010]
The seismic isolation device 9 is a commercial product as shown in FIG. 3 and is provided with a cylindrical lead plug 18 at the center between the upper disk 16 and the lower disk 17, and an inner steel plate 19 and a rubber plate 20 around it. A member formed by laminating and sandwiching the upper and lower sides thereof with a connecting steel plate 21 is formed in a columnar shape and the outer periphery is wrapped with a covering rubber 22. When the load is high, the size of the lead plug 18 is adjusted.
In this seismic isolation device 9, the upper disk 16 side is fixed to the building 1 side, and the lower disk 17 side is fixed to the foundation side of the building 1, so that the building 1 stands up via the seismic isolation device 9. For example, even if the ground motion is transmitted to the foundation side, it is erased by the internal steel plate 19 and the rubber plate 20 laminated with the lead plug 18 so that the ground motion is not transmitted to the building 1 side. It is configured.
There are many types of seismic isolation devices 9 other than those shown in FIG. 3, and the weight of the building can be prepared according to the shape and the like.
[0011]
The above-described seismic isolation load exchange method using the first support jack 4, the second support jack 7, the oil jack 8 and the seismic isolation device 9 is performed according to the following work procedure.
(1) Excavation work at the foundation pile 2 of the building 1 (a predetermined place on the foundation surface of the building if there is no foundation pile) (2) Driving of the auxiliary pile 3 provided around the foundation pile 2 (Since the auxiliary pile 3 has a small work space, it is desirable to press fit a steel pipe.)
(3) Installation adjustment work of the first support jack 4 on the auxiliary pile 3 (4) Partial separation work of the foundation pile 2 (5) Pressure-resistant board for fixing the auxiliary pile 3 and the lower part of the foundation pile 2 (6) Installation of the second support jack 7 and the oil jack 8 on the pressure-resistant panel 5 and the installation work of the seismic isolation device 9 and the formation work of the upper concrete support (7) With the oil jack 8 Close adjustment of the seismic isolation device 9 to the upper concrete support portion 6 and support fixing work of the second support jack 7 (8) Removal of the oil jack 8 and fixing work of the second support jack 7 by the lower concrete support portion 10 It is completed by doing.
[0012]
Since the replacement of seismic isolation load at one location is completed by the above work process, repeat the same procedure for other foundation piles and the specified position on the foundation surface of the building if there is no foundation pile. Therefore, seismic isolation of existing buildings can be easily performed. In this work, since the load of each foundation pile and foundation surface can be measured, it is possible to install seismic isolation devices suitable for each location even in large buildings. The seismic isolation effect for can be increased.
[0013]
【The invention's effect】
As described above in detail, the seismic isolation load exchange method according to the present invention provides a seismic isolation device at the position of each foundation pile, or when there is no foundation pile, at a predetermined position on the foundation surface of the building. Can be selected and installed according to the size of the load, and safety can be improved and work can be performed sequentially from each position, so people living even in existing high-rise buildings can be moved There is a feature that can be implemented without having
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a main part of a seismic isolation load exchange method of the present invention.
2 is an external perspective view of a support jack used in FIG. 1. FIG.
FIG. 3 is a cross-sectional perspective view showing an example of the seismic isolation device used in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Building 2 Foundation pile 3 Auxiliary pile 4 1st support jack 5 Pressure-resistant board 6 Upper concrete bearing part 7 Second support jack 8 Oil jack 9 Seismic isolation device 10 Lower concrete bearing part

Claims (1)

Driving a plurality of auxiliary pile to a predetermined position in the circumferential edge of the foundation pile outlined buildings, each of the upper side of the auxiliary pile by attaching a first support jack is supported buildings, the underlying pile in a building structure Separately lay a pressure plate under the building and place the required number of second support jacks and oil jacks on the pressure plate, while the upper concrete bearing formed between the seismic isolation device and the bottom of the building The seismic isolation device is brought into close contact with the building by the second support jack and the oil jack through the part, and after removing the oil jack, the second support jack is fixed to the pressure platen by the lower concrete support part. Seismic isolation load exchange method.

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