JPH08302709A - Earthquake-proof construction - Google Patents

Abstract

PURPOSE: To contrive a vertical-shake countermeasure by providing a case body with an inner circumferential surface sealing an outer circumferential site in the vicinity of the nose site of a foundation post under a liquid-tight state and a bottomed section, oil filled in the inside of the case body and a compression coil spring between a bottom section and a post end section. CONSTITUTION: A case body 5 formed of a polyethylene resin, etc., as a specified resin material in the fixed shape of outside diametral size D is sealed and fixed at the front end of a foundation post 2, and arranged on ballast 10. Oil 6 is contained in the case body 5. A compression coil spring 4 is internally fitted between a base and the edge section of the post 2 in natural length. When vertical shake is generated by an earthquake, upwards working external force works to the post 2, and the coil spring 4 is compressed, thus absorbing an impulse. On the other hand, the case body 5 is expanded largely, and a volume produced by the compression work of the coil spring 4 is absorbed. A normal state is brought back by restoration work. Shaking is absorbed effectively by the oil 6 at that time. Accordingly, structure having an excellent vertical-shake countermeasure can be constructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic resistant structure suitable for a seismic isolation method.

[0002]

2. Description of the Related Art In Japan, which is one of the most earthquake-prone countries in the world, there has been a great interest in the seismic isolation method in the past, and by installing a laminated rubber made by stacking special rubber and iron plates on a foundation A seismic isolation method to deal with so-called rolling is known, and it was partly adopted in an office building on a trial basis.

In view of the fact that many high-rise condominium buildings have collapsed in the Great Hanshin Earthquake that occurred earlier this year, the seismic isolation method tends to be actively adopted in some high-rise apartment buildings.

According to the above-mentioned seismic isolation method, the laminated rubber provided on the foundation of the building slides properly to absorb the vibrations when it rolls during an earthquake. It is effective for at least rolling because it does not damage the existing building.

[0005]

However, although the above-mentioned seismic isolation method is excellent in terms of horizontal roll countermeasures, it takes into consideration the vertical pitch that is characteristic of the direct earthquake that has become a particular problem in the Great Hanshin Earthquake. Missing. Moreover, since the shaking of an earthquake is often a mixture of horizontal and vertical shaking, the above seismic isolation method alone was not sufficient.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a seismic isolation construction method which is excellent in the measure against vertical vibration.

[0007]

In order to solve the above-mentioned problems and to achieve the object, the present invention is a seismic-resistant structure of a foundation pillar to be buried, in which the outer circumference of the foundation pillar near the tip end portion of the buried portion. A case body made of a predetermined resin material that has an inner peripheral surface that seals the part in a liquid-tight state and a bottom portion, a high clay oil body that is filled and built in the case body, the bottom portion of the case body, and the A compression coil spring is provided which is provided between the ends of the base column so that both end surfaces thereof come into contact with each other.

[0008]

EXAMPLES Examples of the present invention will be described below.
FIG. 1 is a cross-sectional view of a main part according to an embodiment of the present invention,
(A) shows a normal buried state, (b) shows a state in which the seismic resistance device 3 contracts due to an external force acting upward on the foundation 2 due to the first pitching, and (c) shows the seismic resistance device 3 Shows how the coil spring 4 returns by the restoring action.

First, in FIG. 1 (a), a polyethylene resin, a polystyrene resin, a thick vinyl chloride, etc., which is a predetermined resin material, is attached to the tip of a buried pillar 2 which is a foundation of a building buried in the soil 1. A bottomed case body 5 formed in a predetermined shape having a diameter dimension D is sealed and fixed,
It is arranged on the ballast 10 which is laid in advance.

Further, high clay oil 6 is contained in the case body 5. Also, between the bottom surface of the case body 5 and the edge of the support pillar 2 of the foundation, depending on the weight of the building, the wire diameter is 2 cm or more of spring steel and the outer diameter is 50 cm or more. The compression coil spring 4 is internally mounted as shown in the drawing, and the burying work is completed in a state where the compression coil sprig has a natural length as shown in the drawing.

In the above construction, when an earthquake occurs as shown in FIG. 1 (b) and an external force acting upward is applied to the foundation column 2 due to the first pitching, the compression coil sprig 4 inside the seismic resistant device 3 is acted. While being compressed as shown in the figure to absorb the shock, the case body 5 expands outwardly (up to the maximum diameter D1) as shown in the figure to absorb the volume of the compression coil sprig 4 due to the compression action.

After this, when the longitudinal vibration disappears due to the subsidence of the earthquake, as shown in FIG. 1 (c), the seismic resistant device 3 returns due to the restoring action of the built-in coil spring 4, and becomes temporarily thinner than the diameter in the normal state. After passing, the state returns to the normal state shown in FIG. When operating as described above, since the oil 6 contained in the case body 5 has high clay as described above, the state shown in (b) is changed from the state shown in (b) to the state shown in (c). It is possible to shorten the time until the normal state.

That is, the spring vibration from when the compression coil spring 4 first contracts to when it returns to its original state can be effectively absorbed by the oil 6.

Since the oil 6 has a rust preventive effect as is well known, the built-in compression coil spring 4 can be prevented from rusting.

[0015]

As described above, according to the present invention, it is possible to provide a seismic resistant structure which is suitable for the seismic isolation construction method and which is excellent in vertical vibration countermeasures.

[0016]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part according to an embodiment of the present invention, in which (a) shows a normal buried state, and (b) shows an external force acting upward on a foundation 2 due to the first pitching. It shows a state in which the seismic resistant device 3 is contracted by the action, and (c) is the seismic resistant device 3
Shows how the coil spring 4 returns by the restoring action.

[Explanation of symbols]

 2 Foundation post 3 Seismic device 4 Compression coil spring 5 Case body 6 Oil

Claims (1)

[Claims] 1. A seismic-resistant structure for a foundation pillar to be buried, wherein a predetermined resin material is provided which has an inner peripheral surface and a bottom portion for sealing the outer peripheral portion near the tip portion of the buried portion of the foundation pillar in a liquid-tight state. A case body, a high clay oil body that is filled and built in the case body, and a compression coil spring that is provided between the bottom portion of the case body and the end portion of the foundation strut so that both end surfaces are in contact with each other. Seismic resistant structure characterized by doing.