Combined-type steel bridge deck laying method

Abstract

The invention discloses a combined-type steel bridge deck laying method. The combined-type steel bridge deck laying method comprises the following steps that A, a modified epoxy resin and gravel combined-type connection layer is laid, specifically, the surface of a steel plate of a steel bridge deck is subjected to sandblasting shot blasting, modified epoxy resin is laid and smeared on the surfaceof the steel plate to form a first modified epoxy resin layer, gravel is scattered on the surface of the first modified epoxy resin layer to form a first gravel layer, modified epoxy resin is evenlylaid and smeared on the surface of the first gravel layer according to the set dosage to form a second modified epoxy resin layer, and then gravel is scattered to form a second gravel layer; and B, ultra-high performance pavement is laid, specifically, active epoxy asphalt or high-viscosity modified emulsified asphalt is smeared on the surface of the connection layer to form a first waterproof bonding layer, then a stone mixture is laid and smeared to form a waterproof-type structure layer, and finally integrated spreading of a second waterproof bonding layer and a drainage-type abrasion layeris conducted through special equipment. According to the combined-type steel bridge deck laying method, sliding and delaminating between the structural layers are prevented, and the stability and durability of the structure are guaranteed.

Description

technical field [0001] The invention relates to a cable load-bearing structure bridge construction method, in particular to a combined steel bridge deck paving method for a large-span cable load-bearing structure bridge. Background technique [0002] In the past two decades, many long-span cable-bearing structure bridges have been built in my country, and the main girder structure is basically made of orthotropic steel panels and thin-layer pavement to form the bridge traffic system structure. The orthotropic steel bridge deck structure is composed of transverse diaphragm beams, longitudinal stiffeners and the bridge deck supported together. The elastic properties of the bridge deck structure in the transverse and longitudinal directions are different, and the stiffness of the bridge deck in different positions in the same direction is also different. These factors The inhomogeneity of stiffness and deformation of the orthotropic steel bridge deck is formed. In addition, the...

AI Technical Summary

Problems solved by technology

For the technical indicators of the aggregate, the construction site usually checks the physical indicators according to the relevant technical indicators of the "Highway Engineering Aggregate Test Regulations", and the adhesion to the epoxy asphalt binder can also be controlled according to the ordinary asphalt index (≥4). It is difficult for epoxy asphalt mixture to really meet the requirements; at the same time, there will be insufficient or unstable supply of material sources on site, resulting in large changes in the field use and testing of aggregates. Carry out system testing and rush construction

For the selection of slag powder, the physical indicators such as its fineness and hydrophobicity are mainly considered, and it is sufficient not to contain active lime, but there is no additional requirement for harmful impurities in it. If the slag powder is doped with metal minerals, it may be damaged by electrochemical reactions. Cause corrosion, weaken the integrity of the pavement structure, waterproof effect, and bring potential hidden dangers

In the existing single-layer crushed stone structure, the surface of the crushed stone cannot be completely covered by resin, the deformation of the steel bridge deck system is large, and the adhesion of the steel plate on the bridge deck is low. Insufficient, the durability of interlayer bonding is poor, which will cause delamination and slippage between the pavement layer and the bridge deck steel plate and damage it. In the presence of water, the steel plate will be corroded, which is extremely detrimental to the durability and safety of the bridge. Long-term practice has proved that , the bonding and protection between the bridge deck pavement and the bridge deck steel plate play a vital role in the success of the entire steel bridge deck pavement

Images