轻质气泡混凝土在高速公路通道桥扩建中的应用

Application of Light-cellular Concrete in Expansion Project of Expressway Overpass Bridge

随着粤港澳大湾区建设的推进,道路交通量持续快速增长,部分高速公路拓宽扩建需求凸显。由于当年技术水平的限制,数量众多的单跨通道桥在桥台基础下均设置了纵向支撑梁,但若在扩建时沿用此方案,则在施工时需中断桥下的地方道路交通,造成较大影响,实施成本高。相关计算结果表明,若把台后填土调整为轻质气泡混凝土,可显著减小台后路基对桥台的侧向土压力,使得其稳定性满足设计要求,从而达到取消设置纵向支撑梁的设计目的。该换填方案可在不中断桥下交通的前提下实施,具有方便施工、节约造价等优点。

With the development of Guangdong-Hong Kong-Macao Great Bay Area,highway traffic has been increasing rapidly,it has become especially critical for the requirement ofexpansion of some highways.Since the limitation of the technology,while during construction in the past,a brace beam was set between the foundation of the two abutments of an overpass bridge,which will affect the traffic below the bridge dramatically if it has to be rebuilt,whichhas quite high cost.Being based on calculation,the regular soil filling behind the abutment could be replaced bylight-cellular concrete,which could decrease the soil pressures and keep the abutment stable and thus save the brace beam.This method could be carried out with no influence on traffic,and it is also could decrease the cost and convenience for the construction.