某大桥桥墩采用沉井基础,最深的为9.14米,最浅的为3.22米。我们采用的沉井施工方法可分为六个主要工序:1.围埝筑岛;2.在岛上立模绑紮钢筋就地浇筑混凝土;3.拆模后用吊车抓斗不抽水挖基下沉;4.下沉到岩层后“关门”,抽水清基;5.清基后放水灌满沉井,并进行水下浇筑混凝土封底;6.封底二天 A bridge pier using caisson foundation, the deepest 9.14 meters, the shallowest of 3.22 meters. We use the method of caisson construction can be divided into six main processes: 1. Wai 埝 Island; 2. on the island stand-banding steel reinforcement concrete pouring on the spot; 3. After the demolition of the model with a crane bucket digging without pumping Sinking; 4. After sinking to the rock formation, “close the door”, pumping clear base; 5. After the release of clear water base full of caisson, and underwater pouring concrete back cover;