Beam falling prevention reinforcing device of beam type bridge suspended beam section

Abstract

The invention discloses a beam falling prevention reinforcing device of a beam type bridge suspended beam section. The beam falling prevention reinforcing device comprises a plurality of soft steel lead core rubber dampers and a plurality of high-damping rubber buffering devices, wherein the soft steel lead core rubber dampers and the high-damping rubber buffering devices are uniformly distributed between brackets of adjacent cantilever ends and suspended beam ends at intervals. The high-damping rubber buffering devices are vertically arranged, and the soft steel lead core rubber dampers are horizontally arranged. Avoiding from the soft steel lead core rubber dampers and the high-damping rubber buffering devices, reinforcing prestress steel strands and reinforcing prestress steel bars are arranged between the cantilever ends and the suspended beam ends in a staggered and pulling mode. By adoption of the beam falling prevention reinforcing device, the suspended beam ends and the cantilever ends are connected into a whole through the prestress steel bars and connected through the soft steel lead core rubber dampers and the high-damping rubber buffering devices so that the structure can release temperature stress under temperature changes and can further generate energy consumption under violent vibration, and beam falling is prevented; and the prestress steel strands are internally provided with fiber grating sensors which are anchored to beam bodies through retractable anchorage devices, prestress loss can be regularly measured, and the prestress value is adjusted according to the prestress loss.

Description

technical field [0001] The invention relates to an anti-falling girder reinforcing device for a girder section of a girder bridge, and is especially suitable for the anti-falling girder design of a girder bridge using the girder section and for reinforcing old girder bridges. Background technique [0002] The hanging girder bridge is a statically indeterminate structure, and its internal force is not affected by additional deformation such as uneven settlement of the foundation, and will not generate secondary internal forces due to factors such as temperature changes. Compared with simply supported beams, due to the existence of negative bending moments at the fulcrum, the positive bending moments at mid-span are reduced, which can reduce the beam height; compared with cantilever beams, there is no need for system conversion during construction, and large-tonnage supports can be saved The device is suitable for the cantilever construction method and is convenient for constr...

AI Technical Summary

Problems solved by technology

However, due to the deflection at the junction of the hanging beam and the cantilever end, there will be a break point that is not conducive to driving, and the phenomenon of vehicle jumping is serious, and the phenomenon of beam falling is easy to occur under severe vibrations such as earthquakes and ship collisions, so that the use of the hanging beam system bridge is limited. limit

[0003] At present, there are two methods to solve the problem of falling beams in hanging girder bridges. One is to directly make a continuous girder bridge. For old hanging girder bridges, it is not economical and reasonable to demolish them and rebuild them into continuous girder bridges; another method is to directly connect the hanging girders and cantilever ends with rigid devices, but the release of temperature stress cannot be well controlled, and in Under the action of an earthquake, it is impossible to perform effective shock absorption and energy dissipation

Therefore, there is no very effective solution to the phenomenon of anti-falling beams of hanging girder bridges at present, and it is urgent to propose a new reinforcement device and its measures

Images