Quick Repair Method of Existing Expansion Joints in Railway Concrete Bridges

Abstract

A rapid repair method for the existing expansion joints of railway concrete bridges, comprising the following steps: a, removing residual water-stop rubber strips; b, removing dirt and garbage on the concrete base surface and the exposed surface of metal edge beams, and then Drying; c, installing and positioning the underlayment and side lining; d, spraying the primer; e, pouring the repair material; f, spraying the top coat; g, after the repair material is basically cured, the repair is completed. The repair method of the invention can adapt to various irregular sizes of bridge joints; installation and replacement are fast and convenient; the polyurethane repair material itself has good durability and weather resistance, and is suitable for rapid repair; the price is moderate, and it is convenient for mass use.

Description

technical field [0001] The invention relates to a rapid repair method for expansion joints of railway bridges, in particular to a rapid repair method for existing expansion joints of railway concrete bridges. Background technique [0002] After the large-scale construction of high-speed railways, my country's high-speed railways have gradually entered the operation stage. In order to ensure the long-term operation safety of high-speed railways, corresponding durability requirements for high-speed railway infrastructure have been put forward in the design stage. For high-speed railway bridges, my country The durability goal of 100-year service life is clearly proposed in the design codes for high-speed railway bridges. Years of operating experience have shown that more than 90% of the various factors affecting the durability of bridges are related to water damage. Therefore, setting up effective bridge deck defense and drainage systems is one of the main measures to ensure str...

AI Technical Summary

Problems solved by technology

[0005] 1) When the water-stop rubber strip was first installed, the rubber strip was not firmly embedded due to the inconvenience of construction, which laid a hidden danger for the occurrence of diseases;

[0006] 2) The water-stop rubber strip falls off from the embedded groove of the shaped steel, resulting in the complete loss of the waterproof sealing function;

[0007] 3) Since the bridge deck is covered with a track system, the rubber strip cannot be replaced after falling off;

[0009] 5) The length of the metal profile is shorter than the width of the bridge deck, which cannot achieve the overall waterproof effect of the bridge deck

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