Application method of polyurethane sealant in treatment of concrete expansion joint

Abstract

The invention discloses an application method of a polyurethane sealant in treatment of a concrete expansion joint. The application method comprises the steps that (1) construction preparation is conducted; (2) expansion joint cutting is conducted; (3) cleaning of garbage in the joint, snapping the line for positioning and adhesive tape bonding are conducted; (4) joint filling materials and backing materials are filled; (5) pouring of caulking materials is conducted; and (6) joint wide adhesive tape treatment is conducted. According to the application method of the polyurethane sealant in treatment of the concrete expansion joint, railway subgrade attached concrete expansion joints are treated by adopting the polyurethane sealant, and the difficult problems that the concrete seepage-proofeffect of the subgrade side slope of Inner Mongolia regional railway is not good and concrete cracking events constantly occur are solved; and structure performance of the expansion joint is improvedto a large extent, and the overall quality of concrete is ensured, the attractive effect is achieved to a certain extent, and the application method is worth to use and promote in large area.

Description

technical field [0001] The invention relates to the technical field of railway subgrade sealing glue, in particular to an application method of polyurethane sealing glue in the treatment of concrete expansion joints. Background technique [0002] The terrain of Inner Mongolia in my country is dominated by plateaus, with an altitude of 1000-1500m. The winter is long and severe, and the summer is short and warm. The annual average temperature is 10°C, the lowest temperature can reach -32°C, and the depth of permafrost reaches 1.97m. For the railway, in order to avoid and reduce the local slope freezing damage caused by surface water seeping down along the expansion joint, the treatment of the concrete expansion joint of the railway subgrade has become a guarantee for the permanent quality of the concrete project. [0003] In the past, the common treatment methods for concrete expansion joints include asphalt hemp filling, tar plastic cement filling, plastic ointment filling, ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides an application method of polyurethane sealant in the treatment of concrete expansion joints, which solves the above-mentioned problem of how to avoid and reduce the local slope freezing damage caused by the infiltration of surface water along the expansion joints and the expansion and contraction of railway embankment concrete. Seam processing and other issues

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