Novel construction process for expansion joint of high-speed railway bridge

Abstract

The invention discloses a novel construction process for an expansion joint of a high-speed railway bridge, which relates to a construction process in the field of expansion joint sealing of the high-speed railway bridge. The construction process of the invention comprises following the steps: expansion joint treatment, primer preparation and brush coating, potting adhesive preparation and injection forming, curing and detection. The construction process is scientific and reasonable, greatly improves the functions of the expansion joint and greatly prolongs the service life of the expansion joint; the construction process is fine, has perfect bedding surface treatment, and improves the bonding strength of the expansion joint by more than 5 times as compared with the traditional process; and higher bonding strength between the expansion joint and the concrete interface can be obtained to play a waterproof function.

Description

A new construction technique for expansion joints of high-speed railway bridges Technical field: The invention relates to a construction technique in the field of sealing expansion joints of high-speed railway bridges, in particular to the improvement of the construction technique for pouring polyurethane elastomer materials into the expansion joints of existing high-speed railway bridges. Background technique: When building high-speed railway bridges, in order to adapt to the deformation of the bridge surface when it expands with heat and contracts with cold, expansion joints of a certain size are left, and a polyurethane liquid elastic material is poured into the expansion joints to protect the bridge. The traditional construction technology basically does not deal with the concrete interface of the main body of the bridge, and the end seal materials at both ends of the potting are mostly steel, plate, rubber, etc., and the method of direct pouring is adopted. Such a con...

AI Technical Summary

Problems solved by technology

This kind of construction method is easy to bond well with the cast elastomer material, resulting in potting that is not resistant to weather aging and potting cracks

The main body of the bridge leaks, and the service life of the bridge is shortened accordingly. However, this kind of sealing layer is at the lowest layer of the bridge, and it is required to have the same life span as the bridge. Once there is a quality problem, it cannot be repaired at all.

In view of the fact that the traditional simple construction technology cannot make the cast elastic body and the bridge interface well bonded, and cannot guarantee the long working life of the expansion joint, and the railway bridge project is a long-term plan for the country, and the quality needs to be improved

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