RU2508429C2 - Preliminary stressed seismic-isolation bearing - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: preliminary stressed seismic-isolation bearing for buildings and constructions consists of lower and upper parts forming closed chamber in which intermediate bed made of balls and lubricant is located. Lower part of support has a sleeve with thread meant for cavity filling with balls and lubricant reducing friction and providing protection of inner surface from corrosion, also it contains a bolt for generation of preliminary stress in intermediate bed. Upper part consists of base plate, guides shell and conical core, which serves for reduction of specific pressure on inner surface of bearing. Closed chamber is attached to base plates by stiffeners. Stiffness of upper part is provided by stiffeners and a cavity filled with concrete. For bearing attachment holes for anchor bolts in base plates are provided.

EFFECT: providing protection of buildings and constructions against seismic impact, reducing building costs in seismic regions.

3 dwg

Description

The field of technology.

The invention relates to the construction, in particular to the field of providing earthquake resistance of buildings and structures. The purpose of the invention is to provide the necessary level of seismic resistance of buildings and reduce the cost of their construction in seismic areas.

The level of technology.

Closest to the invention, the following seismic isolation devices:

- rubber mounts;

- kinematic supports;

- plate foundation.

The general principle of seismic insulating devices is that they include three parts, two of which are connected to the foundation, divided into the lower part, which rests on the base, and the upper part is rigidly connected to the building. The third part - seismic isolating, provides power connection between the upper and lower part of the foundation, providing the necessary compliance. The world has patented a wide variety of seismic isolation devices. In Russia, rubber-metal bearings and kinematic bearings according to the method of Yu.D. Cherepinsky.

With all their advantages, a seismic insulating plate foundation does not provide control of damping properties.

Known pre-stressed seismic isolating support for buildings and structures, consisting of the lower and upper parts forming a closed chamber, which houses an intermediate pillow of balls and grease (RU 2374393 C2, E 02D 27/00, 11/27/2009) selected as the closest analogue .

The novelty of the invention lies in the fact that the intermediate pillow of the support is made with prestressing, which makes it possible to control the damping parameters of the support. Disclosure of the invention, a brief description of the drawings and the principle of operation.

The purpose of the invention is to increase the seismic resistance of buildings and the effectiveness of capital investments in seismic areas.

A prestressed seismic insulating support for buildings and structures, consisting of the lower and upper parts forming a closed chamber, in which an intermediate pillow of balls and grease is placed, while according to the invention, the lower part of the support has a threaded sleeve for filling the cavity with balls and grease, reduces friction and protects the internal surface from corrosion, and also contains a bolt to create prestress in the intermediate cushion, and the upper part consists of a support casting guide rails and conical core, which serves to reduce the specific pressure on the inner surface of the support, the closed chamber is attached by stiffeners to the base plates, the rigidity of the upper part is provided by the ribs and the cavity filled with concrete, and holes are provided for fixing the support in its base plates anchor bolts.

The design is illustrated by drawings where in Fig. 1 is a top view of a support, in Fig. 2 is a section AA in Fig. 1, in Fig. 3 is a bottom view of a support.

Pre-stressed seismic isolating support, see figure 1, 2, 3 consists of the lower part 3 and the upper part 1, forming a closed chamber in which the intermediate cushion 2 is placed with prestress. The intermediate pillow is made of balls and grease (viscous oil medium) with prestressing. Pre-stressed intermediate cushion allows you to adjust the parameters of the damping and energy absorption of the support. During an earthquake, the lower part 3 of the support with the base oscillates randomly, and in the upper part 1 of the support and the building rigidly connected to it, inertial seismic loads are significantly reduced, which increases the seismic resistance of buildings and structures.

Pre-stressed seismic isolating support, see figure 1, 2 and 3 consists of:

- from the lower part 3 and the upper part 1, forming a closed chamber in which the intermediate cushion 2 of balls and grease is placed, which reduces friction and protects the inner surface from corrosion. A closed chamber with stiffeners 4 is attached to the base plate 12. The lower part 3 of the support has a threaded sleeve 5, through which the chamber cavity is filled with balls and grease, as well as a bolt 6, the tension of which creates a prestress in the intermediate cushion 2.

- from the upper part 1, consisting of a base plate 8, a guide sleeve 9 and a conical core 11, which serves to reduce the specific pressure on the inner surface of the support.

The rigidity of the upper part is provided by ribs 4 * and a cavity 10 filled with concrete, which is formed by a conical core 11 and a base plate 8. For fixing the support to the structures, holes 7 for anchor bolts are provided in the base plates.

Seismic support with a prestressed intermediate cushion operates as follows.

Static loads from the building through the base plate 8 of the support are transferred to the upper part 1 of the support and through the intermediate pillow 2 evenly to the lower part 3 of the support and through the base plate 12 to the foundation and base.

From the horizontal components of the seismic shocks, the lower support plate 12 and the lower support part 3 associated with it move horizontally in the guide cage 9, while the upper part 1 of the support remains at rest.

The intermediate pillow 2 during horizontal movements does not change in volume, the chamber changes in shape, the balls in a viscous medium move from one region to another and vice versa, while the damping properties of the support are controlled by the degree of prestressing of the intermediate pillow.

The support is designed so that the lower part 3 of the support with the foundation and the base during an earthquake can move horizontally relative to the upper part 1 of the support and the building associated with it, which protects buildings and structures from seismic shocks.

Claims (1)

A prestressed seismic isolating support for buildings and structures, consisting of the lower and upper parts forming a closed chamber, in which an intermediate pillow of balls and grease is placed, characterized in that the lower part of the support has a threaded sleeve designed to fill the cavity with balls and grease, reduces friction and protects the internal surface from corrosion, and also contains a bolt to create prestress in the intermediate cushion, and the upper part consists of a base plate, such as a railing cage and a conical core, which serves to reduce the specific pressure on the inner surface of the support, the closed chamber is attached by stiffeners to the base plates, the rigidity of the upper part is provided by the ribs and the cavity filled with concrete, and holes for anchor bolts are provided in the base plates for fixing the support .

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