JP2002266318A - Aseismic base isolation pier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that stability and reliability are reduced by the working of excess horizontal force and excess tensile force to laminated rubbers in the case of an earthquake in a conventional base-isolating scaffold board. SOLUTION: In the aseismic base isolation pier, the pile head section of a vertical pile type scaffold board and an elastic body mounted on the lower section of an upper-section slab are connected mutually in a freely slanting manner by a pin structure section. The pin structure section is composed of pin plates installed to the pile head section and the elastic body respectively and pins pivotally supporting these pin plates in the freely slanting manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation pier, and more particularly to a direct pile type pier having a seismic isolation structure.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional straight pile type seismic isolation pier.
Is a water bottom, 2 is a water surface, 3 is a steel pipe pile that constitutes a straight pile pier,
Reference numeral 4 denotes an upper slab, and reference numeral 5 denotes a high damping laminated rubber interposed between the lower surface of the upper slab 4 and the head of the steel pipe pile 3.

FIG. 6 shows another conventional straight pile seismic isolation pier.
In this example, a cross beam 6 is provided between the steel pipe piles 3 projecting above the water surface 2.
Are connected to each other.

[0004]

As shown in FIG. 7, an ordinary straight pile type pier has a large deformation at the pile head due to bending deformation of the pile during an earthquake. Therefore, when the high damping laminated rubber is installed directly on the pile head as shown in FIGS. 5 and 6, the inclination of the laminated rubber installed on the pile head becomes large, and as shown in FIG. It is feared that the dead weight acts in the horizontal direction of the laminated rubber. Further, since the rigidity of the upper floor plate is higher than that of the pile, excessive tension may act on the laminated rubber having a small rigidity in the vertical tension direction as shown in FIG.

[0005] Excessive horizontal force acting on the laminated rubber and generation of a vertical tensile force pose problems in stability during earthquakes and long-term reliability. As shown in FIG. 6, even when the cross beam is provided on the pile head to increase the overall rigidity, the rigidity of the cross beam connecting the pile head is sufficient for the rigidity of the straight pile in order to solve the above problems. However, there are problems such as an increase in the size of the member and an increase in cost, and also an increase in the overall weight of the upper structure.

An object of the present invention is to solve the above problems.

[0007]

The seismic isolation pier according to the present invention is characterized in that the pile head of the straight pile type pier and the elastic body provided at the lower part of the upper deck are connected to each other by a pin structure so as to be tiltable. And

The pin structure portion includes a pin member having a pin extending in one direction and another direction orthogonal to the one direction, and a pin head and an elastic body pivotally supported by the pin extending in the one direction. It is characterized by comprising a pin plate provided on one of them, and a pin plate provided on one of the other of the pile head and the elastic body so as to be pivotally supported by the pin extending in the other direction so as to be tiltable.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 1, the head of the steel pipe pile 3 and the high-damping laminated rubber 5 are connected by a pin structure 7.

The pin structure 7 is, for example, shown in FIGS.
As shown in FIG. 2, two pins 11 and 12 extending horizontally in one direction and a direction perpendicular thereto are formed on the plate body 13 so as to be pivotally supported at both ends of the pins 11 extending in one direction. Pin plate 14 is fixed to the lower surface of the laminated rubber 5 and two pin plates 15 pivotally supported at both ends of the pin 12 extending in the other direction are fixed to the head of the steel pipe pile 3. Let me know.

Since the seismic isolation pier according to the present invention has the above-described structure, as shown in FIG. 4, even when the pile head has a large horizontal displacement during an earthquake, the laminated rubber 5 can be moved through the pin structure 7. It will always be kept almost horizontal. As a result, the weight of the upper floor slab 4 does not act in the horizontal direction of the laminated rubber 5, so that the generation of an excessive horizontal force can be prevented and the vertical tensile force can be prevented from acting on the laminated rubber 5. .

[0013]

As described above, according to the seismic isolation pier of the present invention, there is a great advantage that a seismic isolation pier which has high stability during an earthquake and can maintain reliability for a long period of time can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a seismic isolation pier according to the present invention.

FIG. 2 is a front view of a pin structure portion of the seismic isolation pier shown in FIG.

FIG. 3 is a perspective view of a pin structure of FIG. 2;

4 is an explanatory diagram of an operation of the seismic isolation pier shown in FIG. 1 at the time of an earthquake.

FIG. 5 is a front view of a conventional seismic isolation pier.

FIG. 6 is a front view of another conventional seismic isolation pier.

FIG. 7 is an operation explanatory view of a conventional seismic isolation pier.

8 is a detailed view of a part of the seismic isolation pier shown in FIG.

9 is an operation explanatory diagram of the seismic isolation pier shown in FIG. 5 during an earthquake.

[Explanation of symbols]

 Reference Signs List 1 water bottom 2 water surface 3 steel pipe pile 4 upper floor slab 5 laminated rubber 6 cross beam 7 pin structure 11 pin 12 pin 13 plate 14 pin plate 15 pin plate

Claims (2)

[Claims] 1. A seismic isolation pier wherein a pile head of a straight pile type pier and an elastic body provided at a lower portion of an upper slab are connected to each other by a pin structure so as to be tiltable. 2. A pin member having a pin structure portion having a pin extending in one direction and another direction orthogonal to the pin member, and the pile head and an elastic body so as to be pivotally supported by the pin extending in the one direction. And a pin plate provided on one of the other of the pile head and the elastic body so as to be pivotally supported by the pin extending in the other direction. The seismic isolation pier according to claim 1.