SU876827A1 - Apparatus for suppressing vibrations of split frameworks of bridge - Google Patents

Description

(54) APPARATUS FOR SUBSTITUTING VIBRATIONS OF CUTTING PIGOLETS OF THE BRIDGE

I

The invention relates to bridge construction and can be used to dampen vibrations of the split span structures of bridges.

A device is known for damping vibrations of split span structures of a bridge, including spring-loaded tightening with end anchors, reinforced in parts of adjacent span structures, and linings rigidly fixed in the lower part of adjacent span structures 1.

The disadvantage of this device lies in the low efficiency of damping vibrations due to the rigid bonding of adjacent spans to the bottom overlays.

The closest to the proposed technical essence and the achieved effect is a device for damping oscillations of split span structures of the bridge, including upper and lower bypass blocks fixed on the end sections of adjacent span structures, tensioned pre-tensioned flexible tightening devices, tightening made in one piece in the form of a 1-cable.

and the tensioning devices are connected to parallel sections of the closed cable 2.

A disadvantage of the known device lies in the insufficient efficiency of damping vibrations due to the relatively low damping capacity of the device.

The purpose of the invention is to increase the efficiency of the oscillations.

This goal is achieved by the fact that the device for damping oscillations of split span structures of the bridge, including upper and lower bypass blocks fixed to the end sections of adjacent span structures, passed through them by pre-stressed flexible fasteners, tension devices, is equipped with intermediate block bypass blocks, reinforced at the end sections of the adjacent spans between the upper and bypass blocks, each of which is flexible around the zigzag bends

Claims (2)

The 20 bypass blocks are in checkerboard order, and the tensioning devices are attached to the end sections of the flexible thongs facing each other. 3 In this case, the device can be equipped with washers of different thickness, mounted on the axis of the bypass blocks, and the washers of equal thickness are mounted on the axis of the bypass blocks arranged in a checkerboard pattern. FIG. 1 shows the device, a general view of the facade of the bridge; in fig. 2 is a sectional view of the FIG. 1. The proposed device includes reinforced on the end sections of adjacent spans 1 and 2, the upper 3 and lower 4 bypass blocks, between which are intermediate intermediate bypass blocks 5, prestressed flexible fasteners 6 and 7, each of which bends around the zigzag bypass blocks 3, 4, and 5 in staggered order, tensioners 8 attached to end portions of flexible pulls 6 and 7 facing each other and turning the last non-continuous cable. In order to eliminate friction between flexible puffs, the device can be equipped with washers 9 and 10 of different thickness, mounted on the axis of the bypass blocks 3, 4 and 5, with washers 9 or 10 of the same thickness being mounted on the axis of the bypass blocks arranged in a checkerboard pattern. The device works as follows. Under the influence of the dynamic load, oscillations of the previous structures occur, at the same time their ends move with respect to each other. The pre-tensioned puffs 6 and 7, which are connected by means of bypass blocks, are shortened and lengthened. The resulting friction between the individual wires of a continuous cable formed by flexible pulls and friction in the bypass blocks will dampen the resulting oscillations of adjacent spans 1 and 2. The effectiveness of damping oscillations depends on the degree of tension of the continuous cable by tensioned devices 8, filled, for example , in the form of lanyards, and providing an opportunity to regulate the oscillatory process. The described device provides effective damping without changing the static scheme of the bridge span structures. The use of the proposed device will provide a significant decrease in the amplitude of oscillations and an increase in the rate of their decay, thereby increasing the durability of the span structures. Claim 1. A device for damping oscillations of split span structures of a bridge, including upper and lower bypass blocks fixed on the end sections of adjacent span structures, passed through them by pre-stressed flexible fasteners, which, in order to increase vibration damping, it is equipped with intermediate bypass blocks fixed on the end sections of adjacent spans between the upper and lower bypass blocks, each of which is flexible puffs zigzag bends around the deflection units staggered and tensioning fixture are attached to the mutually facing end portions of flexible puffs. 2. The device according to claim 1, wherein, in order to avoid friction between the flexible fasteners, it is provided with washers of different thickness, mounted on the axis of the bypass blocks, and the washers of equal thickness are mounted on the axis of the bypass blocks arranged in a checkerboard pattern. Sources of information taken into account during the examination 1. USSR author's certificate No. 657110, cl. E 01 D 9/02, 1977. 2. USSR author's certificate for application number 2858434 / 29-33, cl. E 01 D 9/02, 1979. Alig. Z L