鄂东长江公路大桥桥塔关键部位混凝土耐久性研究

Study of Concrete Durability of Critical Parts of Pylon of Edong Changjiang River Highway Bridge

鄂东长江公路大桥主桥为主跨926 m的混合梁斜拉桥,桥塔采用"凤翎"式结构。为确保大桥100年的全寿命周期,对桥塔关键部位混凝土耐久性设计进行研究。通过优化桥塔构造、优化混凝土原材料配合比、在施工过程中对水化热进行控制、对施工顺序及间隔时间进行合理安排,有效地控制桥塔混凝土裂缝,为大桥运营期间的良好耐久性提供了保障。

The main bridge of Edong Changjiang Highway River Bridge is a hybrid girder cable-stayed bridge with a main span of 926 m and the pylon of the bridge is of the ＂phoenix＇s plume＂ structure. To ensure a life cycle of 100 years for the bridge, the study of the concrete durability design of some critical parts of the bridge pylon was conducted. Through optimization of the pylon structure, mix proportioning of concrete materials, control of hydration heat in the construction process and rational arrangement of construction sequence and intervals, the cracks in the pylon concrete were effectively controlled and good concrete durability during the operation of the bridge was hence guaranteed.