Pavement method for anti-movement composite structure of large-span steel box beam bridge deck

Abstract

The invention relates to a method for paving combined anti-push structures on the surface of a large-span steel box girder bridge, including the following steps: 1) pretreating the steel plates of the large-span steel box girder bridge; 2), welding shear studs: welding shear studs on the steel plates of the large-span steel box girder bridge, with an interval at area of (35-45)cm X (35-45)cm between two shear studs; 3) colligating the reinforcement mats: fixing the reinforcement mats with the mesh in the specification of (95-105)cm X (95-105)cm on the shear studs; 4) mineral aggregate grading; 5)preparing and paving cast-type asphalt concrete; 6) paving a waterproof bond layer; and 7)paving anti-skid denoising wearing layer: paving an anti-skid denoising wearing layer with the thickness of 3-5cm on the waterproof bond layer. The method has the advantages that cohesiveness at the interfaces is good; the paved layer and the steel plates are strong in coordinated deformability, and the construction process is simple and convenient.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and in particular relates to a pavement method for a long-span steel box girder deck anti-moving composite structure. Background technique [0002] At present, my country's highway construction is developing rapidly, and a number of large-span river-cross-sea highway bridges have started construction one after another, and have been completed and opened to traffic one after another. Steel box girder bridges are more and more favored by developers and designers because of their significant advantages such as light weight and economy, especially for long-span bridge types. Orthotropic steel decks are commonly used in steel box girder bridges, and most of the bridge decks are paved with asphalt mixture. However, as the number of vehicles continues to increase, especially in China, there are many heavy-duty trucks, and various violations and overloading phenomena are common. The traff...

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Problems solved by technology

But it also has many deficiencies: relatively strict requirements for high temperature resistance of equipment; high asphalt content, small structure depth, poor wear resistance; easy to segregate during production and construction, poor high temperature stability, It is prone to rutting, and more importantly, the interface bonding performance between it and the steel plate is very poor, and the problem of debonding between the pavement layer and the steel plate still needs to be further improved

(3) Epoxy asphalt concrete (EA), the application effect of this material is better, but the material is completely imported from abroad, and the paving cost is as high as 1,500 yuan / m 2 ; The construction conditions are harsh, and the environmental temperature and humidity conditions are extremely high; once the pavement is damaged, it is difficult to repair, and the maintenance period is as long as 45 days, and the half-width bridge deck cannot be opened to traffic for maintenance

However, with the increasing span of the bridge, the deflection of the bridge is also greatly increased, which also puts forward higher requirements for the toughness of the concrete material of the lower layer of this rigid pavement scheme, and the relationship between it and the long-span steel plate The synergistic and consistent deformation ability needs to be further studied

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