Construction method for polishing outer mold of precast box beam

Abstract

The invention discloses a construction method for polishing an outer mold of a precast box beam. The construction method is used for polishing an inner mold and the outer mold of a precast concrete structural component, brushing a demolding agent on the polished inner mold and the polished outer mold of the precast concrete structural component, and casting a concrete structural article of which the construction period is short in place. The construction method sequentially comprises the following steps: cleaning a base; regulating the size of a wedge block at the bottom of the beam; sticking sealing strips on the outer mold; assembling the outer mold; polishing a formwork, and removing dust; spraying the demolding agent; and after acceptance inspection is qualified, sending semi-finished products into following operation procedures. Handheld polishing equipment is utilized to cleanly polish a staggered platform on the surface of the formwork and residual concrete, an air compressor is used for continuous pressurization so as to spray the demolding agent in a handheld oil tank through a high pressure, the brushing thickness of the demolding agent sprayed in the manner is easier to control than the brushing thickness of the demolding agent sprayed manually, an oil path runoff is not formed in the surface of the formwork, and the color of the outer surface of the box beam can be effectively controlled; the air compressor is adopted to be combined with a spray gun so as to perform pressurized spraying, a uniform isolating layer is formed on the surface of the formwork, and the situation that runoff is formed because too much oil is brushed by using a traditional roller brush is avoided; the concrete surface is smooth after the mold is disassembled, and the appearance color is uniform.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a construction method for grinding the outer mold of a prefabricated box girder when the inner and outer molds of a prefabricated concrete member are polished and coated with a release agent and a cast-in-place concrete structure with a short construction period. Background technique [0002] The appearance quality of concrete is an intuitive reflection of the quality of concrete engineering, and it is an effective measure to protect steel bars from corrosion and ensure the durability of concrete structures. Therefore, improving the appearance quality of concrete is of great significance to concrete engineering, especially for exposed concrete components. Quality control should be strengthened. At present, the prefabricated girders of many large bridges and extra large bridges adopt the structural form of box girders. Once the concrete is poured, it will be difficult to make up f...

AI Technical Summary

Problems solved by technology

At present, the prefabricated girders of many large bridges and extra large bridges adopt the structural form of box girders. Once the concrete is poured, the defects in its appearance will be difficult to make up, leaving hidden dangers to the quality of the project.

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