南京长江大桥双曲拱桥铺装改造设缝的研究

Research on the Joint Setting for the Two-way Curved Arch Bridge Pavement of Nanjing Yangtze River Bridge

南京长江大桥公路落地引桥及分叉落地桥均采用具有我国民族特色的双曲拱桥。南京长江大桥双曲拱桥以及有填料的上承式拱桥,均存在因填料跨墩连续铺筑产生的主墩处的横桥向裂缝所导致的铺装体系耐久性破坏问题。本次改造设计对拱上建筑进行了彻底改造:拱上填料更换为泡沫混凝土,顶面增设钢筋混凝土板及双层沥青。通过对桥面铺装层体系进行方案深入比选以及对桥面进行合理分联设缝,优化了结构受力状态,杜绝了桥面病害。

The two-way curved arch bridge with Chinese national characteristics is used in the approach bridge and bifurcated bridge of the Nanjing Yangtze River Bridge.The two-way curved arch bridge of Nanjing Yangtze River bridge and the deck arch bridge with fillers are all continuously paved with fillers,the transverse crack at the main pier leads to the durability damage of the pavement system.The upgrading design has completely transformed the spandrel construction:the upper arch filler is replaced by foam concrete,and the top surface is reinforced concrete slab and double asphalt.Through the scheme comparison and selection of the bridge deck pavement system and the reasonable joint setting of the bridge deck,the stress state of the structure is optimized and the bridge deck diseases are eliminated.