JPH07292690A - Seismic isolation coupling structure between foundation pile and foundation structure - Google Patents

Abstract

PURPOSE:To improve a base-isolated support structure of a building. CONSTITUTION:A foundation pile A is inserted underground so that the head of the pile may come to a specified depth. The head of the foundation A is coupled with a seismic isolator B which fastens a high damping laminated rubber 3 with a pair of washers 5 and 6 on which there is formed a footing C which supports a foundation structure D. Since the foundation pile A and the foundation structure D are coupled with each other by way of the seismic isolator B, a seismic insolation effect is excellent while a horizontal load acting on the foundation pile A is accordingly reduced. This construction makes it possible to simplify the seismic isolation support structure and facilitate the execution of work as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation connecting structure of a foundation pile made of concrete or steel pipe and a foundation structure.

[0002]

2. Description of the Related Art As one of measures against earthquakes in a building, an upper structure, which is a main body of the building, is seismically supported with respect to a foundation structure. This seismic isolation support structure generally employs a structure as shown in FIG. 4, for example. That is, a large number of anchor streaks 14, 14 are projected on the head of the foundation pile A to form a footing C, and the footing C is connected to the foundation structure D via the footing C. Then, a seismic isolation device B by laminating elastic plates 3 and 3 is installed on this footing C, and a supporting frame F of the upper structure is supported thereon.

[0003]

The above-described conventional seismic isolation structure is similar to the conventional ordinary building in terms of the connection structure of the foundation pile A and the foundation structure D, but the upper structure is seismic isolation. Since it is supported via the device B, the lower end of the superstructure must be a supporting structure F having the same heavy structure as the substructure D, and thus a large amount of cost is required.

Further, since the head of the foundation pile A is integrally rigidly connected to the foundation structure D, it has a drawback that it cannot sufficiently oppose a horizontal force due to an earthquake or the like.
In order to bring out the effect of the seismic isolation structure, it is necessary to increase the diameter of the foundation pile A and increase the number of buried piles, which causes a problem that the cost at this point is greatly increased.

The present invention has been made to solve the above-mentioned conventional problems, and the cost of the seismic isolation structure of a building is improved by connecting the head of the foundation pile and the foundation structure through a seismic isolation device. The purpose of the present invention is to provide a seismic isolation connection structure capable of reducing the load and suppressing the action of horizontal force on the foundation pile.

[0006]

The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. According to the present invention, the head end is inserted to a required depth in the ground. A seismic isolation device B in which a high-damping laminated rubber 3 is tightened with a pair of seat plates 5 and 6 is connected to the head end of the foundation pile A, and the footing C is attached to the seismic isolation device B. Is formed, and the foundation structure D is constructed by supporting the footing C.

[0007]

As described above, the present invention has a structure in which the foundation pile A, the footing C, and the foundation structure D are connected via the seismic isolation device B as described above. When a large horizontal force is applied, the force is buffered by the seismic isolation device B and transmitted to the substructure D. Moreover, since the periphery of the seismic isolation device B is in contact with the ground E, the elasticity of the ground E is also added, and a double damping action is exerted. Generation of stress will be suppressed.

[0008]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a vertical sectional view showing an embodiment of the present invention, in which A is a foundation pile,
B is a seismic isolation device, C is a footing, and D is a substructure.

As the foundation pile A, a hollow concrete ready-made pile is used, and an end plate 1 to which one end of a shaft reinforcing bar 2 is fastened is provided at the upper end thereof. The foundation pile A is inserted into the ground in a state where the end plate 1 is at a required depth position in the ground. Then, at the head end of the foundation pile A, a seismic isolation device B is provided which is connected to the end plate 1.

The seismic isolation device B has a pair of seat plates in which a high-damping laminated rubber 3 having a bolt through hole 4 in the central portion and having a diameter substantially the same as that of the foundation pile A and a bolt through hole 7 in the central portion are also provided. 5,6
Tightening bolt 8 which is sandwiched between and passed through the bolt through holes 4, 7, 7.
With a structure tightened with a nut 9 and one seat plate 5
Is attached to the end plate 1 of the foundation pile A.

In the case of this embodiment, the end plate 1 and the seat plate 5 are connected to each other as shown in FIG. 2 and FIG.
Since a large number of screw holes 11 are provided along the circumferential direction so as to be in contact with the hook holes 10 and to be fixed to the form at the time of manufacturing the foundation pile A, the seat plate 5 has screw holes 11 and 11. Corresponding bolt hole 12,1
It is better to provide 2 and tighten the fastening bolts 13 and 13 into the screw holes 11 and 11. In this case, the seismic isolation device B is formed by fastening the seat plate 5 to the end plate 1 and then mounting the high damping laminated rubber 3 and the seat plate 6 and tightening them with bolts 8 and nuts 9. The end plate 1 and the seat plate 5 can be joined by welding instead of screwing as described above.

A steel pipe pile can also be used as the foundation pile A. In this case, it is preferable that the seat plate 5 of the seismic isolation device B is connected to the head of the steel pipe pile by welding, directly or through a reinforcing material.

On the other seat plate 6 of the seismic isolation device B connected to the foundation pile A, a large number of anchor bars 14, 14 are radially projected upward and fixed by welding. And seismic isolation device B
The concrete 16 is placed in the enlarged hole 15 dug down to the upper end of the base to form a footing C having a diameter larger than that of the seismic isolation device B so as to be slightly exposed on the ground surface.

The footing C is constructed by connecting a building substructure D. That is, the slab concrete 17 of the substructure D is cast to a thickness from the ground surface to the upper surface of the footing C, and the vertical and horizontal foundation beams 18 and 18, which are the main components of the substructure D, are mounted thereon. -Constructed in such a way that they intersect on the ching C, the intersections preferably being formed in a foundation column 21 having the cross section necessary to mount the columns 20 of the upper building frame.

The seismic isolation device B is connected to the foundation pile A, and
In order to form the tie C, after inserting the foundation pile A into the ground, the surrounding ground is dug down until the head of the foundation pile A is exposed, the seismic isolation device C is coupled, and the soil is backfilled around it. , The ground forming the footing C may be removed, an anchor line may be welded to the seat plate 6, and the concrete 16 may be placed. In this case, when the insertion depth of the foundation pile A is uneven, the distance to the footing C can be adjusted by changing the thickness of the high damping laminated rubber 3 of the seismic isolation device B. Therefore, the pile head processing work, which was conventionally complicated, becomes unnecessary.

[0016]

As described above, according to the present invention, since the foundation pile, the footing, and the foundation structure are elastically coupled to each other through the seismic isolation device, the foundation pile or Even if a large horizontal force is applied to the foundation structure, they are mutually buffered by the seismic isolation device, and the influence on the building and foundation piles can be suppressed. Moreover, since the periphery of the seismic isolation device is in contact with the ground, a dual preferable damping effect is exhibited together with the elasticity of the ground.

Further, since the foundation pile and the foundation structure are directly connected through the seismic isolation device, the cost of the seismic isolation structure is reduced and the horizontal force on the head of the foundation pile is buffered. As a result, the increase in foundation pile cost will be reduced. In addition, the seismic isolation device has a large damping rubber and seat plate that are firmly connected by bolts and nuts, and is integrally connected to the foundation pile and footing through the seat plate. Even if the pulling force acts, it can counteract it. Furthermore, the uneven heads of the inserted foundation piles can be aligned by changing the thickness of the high-damping laminated rubber of the seismic isolation device, thus eliminating the need for the complicated work of pile head treatment, thus reducing the cost. Reduction can be achieved.

When a concrete pile that has been generally used in the past is used as the foundation pile, the seismic isolation device can be mounted without welding by using the screw holes provided in the end plate. It can be done more easily and reliably.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing a main part of an end plate of the foundation pile.

FIG. 3 is a vertical cross-sectional view showing an example of connection between an end plate and a seat plate of the foundation pile.

FIG. 4 is a vertical sectional view showing a conventional seismic isolation structure.

[Explanation of symbols]

 A Foundation pile B Seismic isolation device C Footing D Foundation structure E Ground 1 End plate 2 Axis rebar 3 High damping laminated rubber 5, 6 Seat plate 8 Bolt 9 Nut 11 Screw hole 13 Fastening bolt 14 Anchor bar 16 Concrete − G 18 foundation beams 20 columns

Claims (1)

[Claims] A seismic isolation device, in which high-damping laminated rubber is tightened with a pair of seat plates, is connected to the head end of the foundation pile with the head end inserted to the required depth in the ground. -A seismically isolated connection structure of a foundation pile and a foundation structure, which is characterized in that a foundation is constructed by supporting the footing by forming a retaining structure.