Guarding system for railway steel bridge deck and construction process thereof

Abstract

The invention relates to a railway steel bridge surface protective system, which comprises an epoxy zinc-enriched erosion resistant coating, a polyurea elastomer waterproof layer, a connecting layer and a concrete protective layer, wherein, epoxy zinc-enriched materials comprise a composition A and a composition B; the composition A comprises epoxy resin, organic bentonite, zinc powder, additives, inhibitive pigment A, inhibitive pigment B and solvent; the composition B is 115 curing agent, 650 curing agent and solvent; a polyurea elastomer comprises a material A and a material B, wherein, the material A is semi-prepolymer and thinner, and the material B is amine-terminated polyether, amine chain extender, color paste and thinner. The invention also relates to a construction technique for the railway steel bridge surface protective system. By adoption of the construction technique, the antirust property is superior; waterproof coating has superior physicochemical mechanical property; the waterproof layer has no seam; no dead angle exists during the construction process; the construction technique is simple and convenient, and the construction efficiency is high; the anticorrosive and waterproof problems of a steel bridge surface are solved; the durability of a bridge is improved; and the maintenance period and the service life of the steel bridge surface are prolonged.

Description

technical field [0001] The invention relates to a railway steel bridge deck protection system and its construction technology. Background technique [0002] At present, the total mileage of my country's railway operating lines is 70,000km, and there are more than 40,000 bridges, about 2,500km in length, most of which are reinforced concrete and prestressed concrete bridges, accounting for more than 90% of the total bridge length, while steel bridges account for about 7%. In order to ensure the durability of railway bridges and meet the 100-year service life requirements of bridge engineering, the deck of steel bridges must be treated with anti-corrosion and waterproof layers, otherwise harmful media such as rainwater, excrement, etc. will reach the bridge deck through ballast and other gaps, causing Corrosion occurs on the bridge deck. At the same time, since the bridge deck carries ballast, sleepers and steel rails, it is difficult to find the service status of the bridge d...

AI Technical Summary

Problems solved by technology

However, in recent years, through the quality inspection of major manufacturers in my country, it has been found that the quality of epoxy zinc-rich antirust paint produced by most manufacturers is unstable, and foaming occurs in a short period of time in the salt spray test, which affects the antirust effect. It is necessary to improve the formulation of epoxy zinc-rich antirust paint to further improve the corrosion resistance, improve the corrosion resistance of the steel bridge deck, and prolong the service life

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