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五峰山长江特大桥为世界首座跨度超过千米的公铁两用悬索桥,其北锚碇沉井平面尺寸远超以往施工沉井,居世界第一。为防止沉井首次下沉时底部混凝土拉应力过大,提出全断面开挖取土、保持沉井多点支撑的下沉理念,各个隔仓采用“十字开槽”的方式控制开挖量,并结合实时挠度及应力监测,及时对各个隔仓开挖量进行调整,对沉井应力及姿态进行了有效控制。
Wufengshan Yangtze River Bridge is the world’s first railway suspension bridge with a span of more than 1000 meters. The plane dimensions of its North Anchorage are far beyond the previous construction caisson, ranking first in the world. In order to prevent the subsidence of concrete at the bottom of the caisson during the first time sinking, the concept of subsidence of full-face excavation is proposed to maintain the multi-point support of caisson. Each unit adopts the method of “cross slotting” to control excavation In combination with real-time deflection and stress monitoring, the excavation volume of each silo was adjusted in time to effectively control the caisson stress and attitude.