RU2406804C2 - Universal seismic-insulating foundation - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: seismic-insulating foundation consists of lower and upper parts and intermediate element, in the form of chamber filled with balls in viscous oil medium. Chamber is arranged with valves, which make it possible for the lower part of foundation and connected lower surface of chamber during earthquake to move both horizontally and vertically relative to upper part of chamber and connected upper part of foundation, providing for simultaneous protection of the building against horizontal and vertical seismic shocks.

EFFECT: improved seismic resistance of buildings and reduction of material intensity.

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Description

Technical field

The invention relates to the field of construction. The purpose of the invention is to ensure a sufficient level of seismic safety of buildings and reduce the cost of their construction in seismic areas.

The seismic insulating foundation (see figure 1, 2) consists of the lower part 1 and the upper part 5 and the intermediate element 2, made in the form of a closed chamber. The chamber 2 is filled with balls with a viscous oil medium and is made with valves that, during an earthquake, allow the lower part 1 of the foundation to oscillate randomly with the base, and the upper part 5 of the foundation and the building rigidly connected to it remain at rest, significantly reducing inertial seismic loads on the building.

State of the art

Closest to the invention are the following seismic insulating foundations:

- foundations with rubber-metal supports;

- foundations with kinematic supports;

- plate foundation.

The general principle of seismic insulating foundations is that they include three parts, two of which are a foundation divided into a lower part, which rests on a base, and an upper part, rigidly connected to the building. The third part - seismic isolating, provides power connection between the upper and lower parts of the foundation, providing the necessary compliance.

The world has patented a wide variety of seismic isolating supports. In Russia, the most widely used rubber mounts (Smirnov V.I., Aizenberg Y.M. Application of seismic isolation of buildings and historical structures in Russia. Sat .: Construction in seismic regions of Ukraine. - Issue 60. Kiev - 2004. P. 210- 217) and seismic isolation with kinematic supports (Yu.D. Cherepinsky. Seismic isolation of residential buildings. Almaty, 2003, pp. 26-29). The closest to the universal seismic insulating foundation - the seismic insulating plate foundation (RU 2007146296, class E02D 27/00, Bull. No. 18, 2009, p. 1) provides only horizontal seismic isolation of the building.

With all their advantages, all the above foundations dampen only horizontal vibrations of the base, but, as you know, earthquakes are accompanied by chaotic oscillations of the earth.

The novelty of the invention lies in the fact that the intermediate element in the form of a closed chamber is made with valves that simultaneously dampen horizontal and vertical vibrations of the base.

Disclosure of the invention, a brief description of the drawings and the principle of operation.

The invention relates to the construction, in particular to the field of ensuring the seismic safety of buildings and structures. The purpose of the invention is to increase the seismic resistance of buildings and the effectiveness of capital investments in seismic areas.

In Fig.1 is a plan of the foundation, and in Fig.2 - its section aa. For convenience of explanation of the principle of operation of the intermediate element shown in figure 3 and 4.

The foundation is arranged in the following order.

An intermediate element is mounted on the reinforced concrete preparation and the lower reinforced concrete part 1 of the foundation is made, then the upper part 5, the clamps 6 are dismantled after the construction of the building skeleton.

The intermediate element (see figure 3 and 4) consists of:

- supporting ribs 7, made for the convenience of mounting on a plate;

- bottom conical surface 10 with valves 3;

- valve 3 with a piston 9 and an elastic element 8;

- the upper surface 11 with a cone and a clip 13 and stiffeners 15;

- the chamber 2 is filled with balls 12;

- washer 4 in clips 13 and 14;

- clamps 6 installed for the period of transportation and installation.

Universal seismic isolation foundation works as follows.

Static loads from the building through the upper part 5 of the foundation are transferred to the upper surface 11 and through the balls 12 evenly to the lower surface 10 and through the lower part 1 of the foundation to the base.

From the horizontal components of seismic shocks, the lower part of the foundation 1 and the associated lower surface 10 are moved horizontally, with a washer 4, which slides in the cage 13, the upper surface 11 remains at rest.

The volume of chamber 2 during horizontal movements does not change, the shape of the chamber changes, balls in a viscous medium move from one region to another and vice versa, acting as dampers.

From the vertical components of the seismic shocks, the elastic elements 8 are activated, and the piston, pushing or filling the valve 3 with balls 12, allows the lower part 1 to move vertically, damping the vertical seismic shocks.

The foundation is designed so that the lower part 1 of the foundation with the base during an earthquake can simultaneously move horizontally and vertically relative to the upper part 5 of the foundation and the building connected with it, which provides seismic protection from horizontal and vertical seismic shocks simultaneously.

Claims (1)

A seismic isolating foundation, consisting of lower and upper parts and an intermediate element, in the form of a chamber filled with balls in a viscous oil medium, characterized in that the chamber is made with valves that allow the lower part of the foundation and the associated lower surface of the chamber during an earthquake to simultaneously move horizontally and vertically relative to the upper part of the chamber and the upper part of the foundation connected with it, providing simultaneous protection of the building from horizontal and vertical seismic shocks.

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