Anti-corrosion technology of thinned steel box girder bridge deck comprehensive system

Abstract

The invention discloses an anticorrosion process for a thinned steel box girder deck integrated system. The anticorrosion process comprises the steps of sand-blasting a steel box girder, dedusting viaa shot blaster, and thoroughly clearing all impurities on the metal surface such as oil oxide rust products; a composite anticorrosion layer of arc-sprayed aluminum-zinc alloy and aluminum-zinc coating, wherein a mass ratio of aluminum to zinc is 50:50; the aluminum-zinc coating has the mass ratio has good uniformity and compactness and small porosity, can be combined well with a base, has bettercorrosion resistance than pure zinc and pure aluminum, is the same as a zinc coating in terms of cathode protection and as an aluminum coating in terms of corrosion rate, and has optimal comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of metal product processing, and specifically refers to an anticorrosion process for a thinned steel box girder bridge deck comprehensive system. Background technique [0002] Steel box girders are more and more widely used in long-span bridges because of their advantages such as light structure, high bending and torsional rigidity, large span, novel structure, simple and beautiful appearance, quick construction and uninterrupted traffic. Steel box girder deck structure from bottom to top is steel box girder deck, anti-corrosion coating, sealing layer or waterproof layer, adhesive layer, asphalt concrete pavement layer. If the anti-corrosion coating fails or partially fails, the adhesive layer and asphalt concrete pavement layer attached to the anti-corrosion layer will be more prone to failure phenomena such as cracking, shifting and delamination of the road surface under the long-term action of the vehicle...

AI Technical Summary

Problems solved by technology

In particular, double-layer SMA paving has been widely used in China in recent years. Due to poor bonding performance, it is easy to damage the bonding layer and the anti-corrosion layer under it during road surface maintenance and replacement.

In the past, some design departments also adopted other pavement materials and technologies, such as using concrete to replace the asphalt mixture layer. However, this method not only increases the self-weight of the bridge deck, but also ordinary concrete has a high elastic modulus and high brittleness, and the pavement layer It is easy to produce brittle fracture under the action of heavy load and dynamic load, which will affect the working performance of the bridge deck