重庆市李家沱长江复线桥钢桥面铺装结构方案研究

Study on Scheme for Steel Deck Paving Structure of Lijiatuo Yangtze River Double-line Bridge in Chongqing

摘要:

为选择重庆市李家沱长江复线桥钢桥面铺装的最优组合结构，对钢桥面常见的4种铺装结构进行路用性能研究，其中包括：双层改性SMA；浇注式沥青混凝土+高弹改性沥青SMA；双层环氧沥青混凝土；下层环氧沥青混凝土+上层高弹改性沥青SMA。针对重庆市李家沱长江复线桥的服役条件和设计要求，对以上4种铺装结构的路用性能进行评价，结果表明：下层环氧沥青混凝土+上层高弹改性沥青SMA的铺装结构在高温性能、抗滑性能和黏结性能上都有着优异的表现，为李家沱复线桥钢桥面铺装的最适宜方案。

Abstract:

In order to select the optimal composite structure of steel deck paving of Chongqing Lijiatuo Yangtze River Double Line Bridge, the pavement performances of four common paving structures of steel bridge deck are studied, including double-layer modified elasticity modified asphalt, poured asphalt concrete + high elasticity modified asphalt, double-layer epoxy asphalt concrete, lower epoxy asphalt concrete + upper high elasticity modified asphalt. According to the service conditions and design requirements of the Lijiatuo Double-line Yangtze River Bridge in Chongqing, the pavement performances of the above four paving structures are evaluated. The result shows that the paving structure of the lower epoxy asphalt concrete + upper high-elasticity modified asphalt have the excellent performances in high temperature performance, anti-slip performance and bonding performance, which is the most suitable scheme for the steel deck pavement of Lijiatuo Double-line Bridge.