Coating process for unreachable surface of corrugated web steel-concrete composite beam

Abstract

The invention discloses a coating process for an unreachable surface of a corrugated web steel-concrete composite beam. The coating process comprises the following steps of (1) treating dirt on the unreachable surface, firstly, cleaning the dirt on the surface of the unreachable surface by using a steel wire brush, and wiping oil dirt by using cotton yarn dipped in kerosene if the oil dirt exists; (2) coating rust conversion primer, rust conversion primer is brushed in the inert gas surface blowing environment, and a rust conversion coating is formed. and (3) coating of middle-layer paint and finish paint, spraying or brushing the middle-layer paint and the finish paint by taking the rust conversion coating as primer. When the unreachable surface of the corrugated web steel-concrete composite beam is constructed, a construction environment protected by inert gas is provided, the unreachable surface is scoured by the inert gas during brushing, the effects of blowing dust and isolating moisture can be achieved, the brushed rust conversion primer can be quickly chelated with rust on the surface of steel to form a protective layer, the construction environment requirement is reduced, and the anti-corrosion effect can be improved.

Description

technical field [0001] The invention belongs to the technical field of steel surface anticorrosion, and in particular relates to a coating process for an unreachable surface of a corrugated web steel-concrete composite beam. Background technique [0002] After the corrugated web steel-concrete composite beam is produced, the inner and outer surfaces need to be painted to meet the anti-corrosion period requirements. Before painting, it is necessary to sand and derust the painted parts. However, due to the large number of angles, slits and intersections on the inner and outer surfaces of corrugated web steel-concrete composite beams, on the one hand, large-scale shot blasting and sandblasting equipment cannot be used, which seriously reduces the efficiency of sand blasting and coating. On the other hand, manual sanding and rust removal are not thorough, leaving hidden dangers for subsequent painting construction. Angles, slits and intersections where conventional coating mac...

AI Technical Summary

Problems solved by technology

However, due to the large number of angles, slits and intersections on the inner and outer surfaces of corrugated web steel-concrete composite beams, on the one hand, large-scale shot blasting and sandblasting equipment cannot be used, which seriously reduces the efficiency of sand blasting and coating

On the other hand, manual sanding and rust removal are not thorough, leaving hidden dangers for subsequent painting construction

Angles, slits and intersections where conventional coating machinery and equipment cannot be applied, that is, unreachable surfaces

In the prior art, there is a process of using rust conversion primer for steel plate anticorrosion, which can be applied to the anticorrosion of inaccessible surfaces. The construction method is mainly spraying or brushing, but the existing process cannot provide good protection for inaccessible surfaces during construction. In the construction environment, the rust conversion primer is easy to be mixed with impurities during construction, resulting in local peeling or sanding, and cannot overcome the high humidity construction environment and affect the drying time, which reduces the anti-corrosion performance of the steel plate surface.

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