Flexible laying structure and construction method suitable for steel bridge deck at damp and hot high-temperature region

Abstract

The invention discloses a flexible laying structure and a construction method suitable for a steel bridge deck at a damp and hot high-temperature region. The flexible laying structure comprises a waterproof adhesive layer arranged on a bridge deck plate, wherein a laying lower surface layer is arranged on the waterproof adhesive layer; a laying upper surface layer is arranged on the laying lower surface layer; the laying lower surface layer and the laying upper surface layer are bonded through an interlayer adhesive layer; the laying lower surface layer adopts high-temperature resistance casting type asphalt concrete, so that the void percentage is low, the cohesive performance is good, protective effect to the steel bridge deck is achieved, good compliance of the laying lower surface layer and the steel bridge deck plate can be kept, and the fatigue resistance is good; the laying upper surface layer adopts a thin-layer epoxy asphalt concrete, and has the characteristics of being high in strength, good in toughness, high in fatigue resistance, high in cohesive performance, and good in high-temperature stability, so that the laying form of the flexible laying structure disclosed by the invention can be widely used in the damp and hot high-temperature region in south, and has good high-temperature resistance, good crack resistance, good durability, good compliance, and good waterproofness.

Description

【Technical field】 [0001] The invention belongs to the technical field of bridge traffic, and in particular relates to a flexible pavement structure and a construction method for a steel bridge deck suitable for hot and humid high temperature areas. 【Background technique】 [0002] With the rapid development of my country's transportation industry, more and more long-span bridges are being built, and the pavement of long-span steel box girder decks has always been a technical difficulty and research hotspot in bridge construction. At present, steel bridge deck pavement structures are widely used and mature, mainly consisting of three pavement structures: double-layer modified asphalt SMA, modified asphalt SMA+pourable asphalt mixture+double-layer epoxy asphalt mixture. Although the double-layer SMA pavement structure has mature technology and controllable quality, its water tightness and deformation resistance are poor; the modified asphalt SMA+poured asphalt mixture pavement ...

AI Technical Summary

Problems solved by technology

Although the double-layer SMA pavement structure has mature technology and controllable quality, its water tightness and deformation resistance are poor; the modified asphalt SMA+poured asphalt mixture pavement structure has good water tightness and follow-up deformation ability, and the pavement's resistance to deformation is poor. Good sliding effect and excellent fatigue performance, but the current pouring asphalt mixture has limited high temperature performance, high construction temperature, and prone to aging phenomenon; the pavement structure of double-layer epoxy asphalt mixture has good high temperature temperature and follow-up deformation ability , but the construction control of epoxy asphalt concrete is difficult, the mixing and construction equipment requirements are high, the construction period is longer than ordinary asphalt concrete, and the project cost is significantly higher than ordinary asphalt mixture, the application of epoxy asphalt concrete is severely restricted

At present, the bridge deck pavement of steel box girder bridges such as Humen Bridge, Jiangyin Bridge, and Queshi Bridge have tried the above three pavement structures, but due to the large traffic road, many overloaded vehicles, hot and humid environment, it has been open to traffic for less than 5 years , there have been diseases such as shifting, wrapping, and rutting, which have seriously affected its service life.

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