葑溪大桥施工控制

为了保证葑溪大桥的施工安全和质量,根据预应力混凝土斜拉桥悬臂浇筑和支架现浇非对称施工特点,建立施工控制计算模型,探讨影响主梁线形及斜拉索索力的因素,并制定相应控制措施,对主梁线形、内力、索力、牵索挂篮应力和变形进行有效监控.施工控制结果表明:成桥状态下,主桥轴线实测标高、桥梁应力状态、成桥索力均满足设计要求,挂篮在施工过程中的应力状态及变形情况与试验变化趋势基本一致.

Construction Control of Fengxi Bridge

To ensure the construction safety and quality of the Fengxi Bridge,a prestressed concrete cable-stayed bridge and in the light of the asymmetric construction characteristics of cantilever casting and casting of the bridge on scaffolding,a calculation model for the construction control of the bridge was established,the factors having influences on the geometric shape of the main girder and on the stay cable forces of the bridge were studied and the corresponding measures were formulated for the effective monitoring and control of the geometric shape and internal forces of the main girder,the stay cable forces and the stress and deformation of the guyed form travelers.The results of the construction control show that in the state of the completed bridge,the measured elevation of the axis of the main bridge,the stress conditions and the stay cable forces can all accord with the design requirements and the stress conditions and deformation of the guyed form travelers in the construction process are basically identical to the change tendency of the stress and deformation in the testing.