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 armor plates of the large-span steel box girder bridge; 2), welding shear studs: welding shear studs on the armor 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 at 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 coat; and 7)paving anti-skid denoising wearing layer: paving a anti-skid denoising wearing layer at thickness of 3-5cm on the waterproof bond coat. The method has the advantages that cohesiveness at the interfaces is good, the paved layer and the armor plates are strong in coordinated deformability, and 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 paving method for a long-span steel box girder bridge deck anti-movement composite structure. Background technique [0002] At present, my country's highway construction is developing rapidly, and a number of large-span cross-river and sea-crossing highways and bridges have been started one after another and opened to traffic. Steel box girder bridges are more and more favored by developers and designers due to their significant advantages such as light weight and economy, especially suitable for long-span bridges. Steel box girder bridges generally use orthotropic steel decks, and most of the decks are paved with asphalt mixture. However, as the number of vehicles continues to increase, especially in China, there are more heavy-duty trucks. Various violations and overloading are commonplace. The traffic load on the entire national highway network has incr...

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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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