SU483480A1 - Bridge - Google Patents

Description

one

The invention relates to the construction and can be used in the construction of suspension bridges.

Known bridges include. anchor supports, cable and suspension stiffener suspended from it.

The disadvantage of these bridges is that it is impossible to suppress simultaneously vertical, horizontal and torsional vibrations in them.

The aim of the invention is the simultaneous damping of vertical, horizontal and torsional vibrations.

This is achieved in that the stiffener truss is provided with prestressed ropes supported on it movably in the longitudinal direction on it by means of their multiple bends in the horizontal and vertical planes through the system of rollers and fixed at the ends of the bridge in the anchor supports.

FIG. 1 is a general bridge diagram; FIG. 2 shows a section of a stiffening beam with cable elements (front view); FIG. 3- the same, in the plan without flooring; in fig. 4 is a cross-section of the truss stiffness along the A-A to -fig. 2

The bridge contains anchor supports 1, cable 2 and a stiffener farm 3 suspended from it. Stiffener farm 3 is equipped with prestressed ropes 4, 5. Ropes 4 have aa average lines offset down from the axis of stiffness centers, and ropes 5: - medium lines "lai, located near

planes of lower planes and offset from the axis of the centers of stiffness.

Ropes 4, 5 are movably supported in longitudinal direction to rigidity farm 3 by means of their multiple bends in horizontal and vertical planes and fixed at the edges of the bridge in anchor supports 1. The bend assembly of ropes 4, 5 can be made in the form of rollers fixed on brackets which can be moved along the normal line and the midpoint of the kinks corresponding to the ropes 4, 5 with the help of clip elements.

With a vertical or horizontal rigidity truss truss 3, its sax lengthens or shortens. Correspondingly, the distances between adjacent bending nodes of the ropes 4, 5 change, which leads to the relative movement of the rope points and 3 bending nodes fixed on the rigidity farm. In this case, the bending zones move along the length of the rope and mutual relative slippage of wires and strands inside the rope occurs. Thus, the oscillation energy of the bridge is spent on the work of the forces

internal friction in the ropes.

By moving the wedge elements, you can redistribute the value of the angles of inflection along the length of the bridge and adjust the prestressing of the ropes.

Subject invention

The bridge consists of anchor supports, a cable and a stiffener truss attached to it, characterized in that

the purpose of simultaneous strengthening of vertical, horizontal and torsional vibrations, the stiffening truss is provided with prestressed ropes, supported on it movably in the longitudinal direction by means of their multiple bends in the horizontal and vertical planes through the system of rollers and fixed at the ends of the bridge in the anchor supports.

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