SU870565A1 - Device for damping oscillations of bridge structure - Google Patents

Description

one

The invention relates to the field of bridge construction and can be used. It is designed to dampen vibrations of raerezny bridge span structures.

A device for damping vibrations of split span structures of a bridge is known, including 11; its upper and lower tie rods, mounted on adjacent transient structures mounted on a support with a clearance relative to each other, the upper puff being made in the form of a spring-loaded rigid rod and the bottom IJ overlays.

The disadvantage of this device lies in the relatively low reliability of its operation due to the possible plasticization that is repeated during the oscillations or the loss of stability of the bottom puff in the form of linings, which leads to a reduced rigidity and brittle strength of the device as a result of work hardening. In addition, the presence of overlays approximates the static scheme of the span to the continuous, that

THAT reduces the effectiveness of the damping device oscillations

A closer solution to the proposed device to the technical essence and the achieved effect is a device for damping oscillations of split span structures of the bridge, including upper and lower prestressed cable puffs, mounted on

10 on a support with a gap relative to each other of adjacent spans, and bypass blocks fixed in their lower part, with the bottom pulling around the bypass blocks in a zigzag manner and

15 zaankena ends on opposite faces of the support body 2.

A disadvantage of the known device is the relatively complicated

Claims (2)

Its design is due to the necessity of anchoring the jaws both on adjacent spans and on the support, as well as the insufficient stability of damping oscillations in a wide range. The purpose of the invention is to simplify the design of the device and increase the stability of damping oscillations in a wide range by making it possible to control the tension of cable puffs. The goal is achieved by having a device for damping vibrations of split bridge span structures including upper and lower pre-tensioned cable puffs. reinforced on adjacent superstructures mounted on a support with a gap relative to each other, and the bypass blocks attached to the lower part of the device are tensioned with additional devices and reinforced on adjacent spans in the upper part by additional bypass blocks, the upper and lower puffs being integrally formed as a closed cable, the main and additional bypass blocks in the vertical and horizontal directions. At the same time, the tensioning device of the bridge is made in the form of a lanyard placed in the gap between adjacent spans with clamps at the ends attached to opposite the 1plosed sections of the closed cable. The figure shows the proposed device for the facade of the bridge, a general view; on fig. 2 shows section A-A in FIG. The device contains the main 1 and additional bypass blocks 2, mounted on adjacent spans 3, 4, respectively, in the lower and upper parts of them, prestressed cable upper and lower puffs, made in one case in the form of a closed cable 5, envelope bypass blocks 1: 2 in the vertical and horizontal directions. The device is also equipped with a tensioning device, which can be made in the form of adjacent lanyard 6 placed in a gap between me and pushbolts 3, 4 of lanyard 6 with clamps 7 according to crimpers attached to opposite sections of the closed cable 5. Grips 7 can also be used for docking the ends of the cable 5. The device operates as follows. Under the influence of the dynamic load, oscillations of the spanning 5 of the structures 3, 4 occur, the floor of which moves relative to each other, as a result of which the bend around the bypass blocks: sh 1, 2 Closed cable 5 will alternately lengthen or shorten. The resulting friction between the individual wires of the cable 5 and the friction in the blocks 1, 2 provide damping of vibrations of adjacent spans 3, 4. The efficiency of the oscillations depends on the degree of tension of the closed cable 5 by means of the tension device, which will also ensure oscillation stability in a wide range. Claims 1. A device for damping vibrations of split span structures of a bridge, including upper and lower prestressed cable pulls, mounted on adjacent transient structures mounted on a support with a gap relative to each other, and reinforced blocks installed in the lower part of them that, in order to simplify the design of the device and increase the stability of vibration damping 4 in a wide range by providing the ability to control the tension of cable puffs, it is equipped with tension by adapting and fastened on the adjacent spans in BepXHes, their parts are additional bypass blocks and the upper and lower puffs are made in one piece as a closed cable, which goes around the base and additional bypass blocks in vertical and horizontal directions. 2. A device according to claim 1, characterized in that the tensioning device is made in the form of a lanyard attached to the opposite section — a closed cable — located in the first mend of the gap between the lanyards. Sources of formations taken in attention during examination 1. Author's Certificate of the USSR W 657110, cl. , E 01 D 9/02, 1977. 2. Authors svdedelstvo. USSR on application number 2853923 / 29-33, cl. E 01 D 9/02, l4.12.79. V i: