混凝土斜拉桥换索工程施工控制的研究

RESEARCH ON CONSTRUCTION CONTROL FOR CABLES REPLACEMENT OF THE CONCRETE CABLE-STAYED BRIDGE

由于斜拉索钢丝腐蚀和疲劳、锚具松脱、混凝土的收缩徐变、支座沉降变位、以及施工、养护等诸多原因而使得斜拉桥面临更换拉索的问题。皎平渡大桥主要在换索过程中主要从斜拉索索力、主梁标高、梁和塔的应力等方面进行施工控制,桥梁在换索后全桥的受力状态基本保持原有(换索前)状态,对结构受力状态基本没有影响,结构可以安全使用。

As the cable-stayed steel corrosion and fatigue, anchor loose, concrete shrinkage and creep, bearing settlement deformation, as well as the construction, maintenance and many other reasons, they make the cable-stayed bridge facing the problem of replacing cables. Jiaopingdu Bridge construction mainly oontrols five aspects in the process of changing cables, which including cable tension, the main beam elevation, the stress of beams and towers and so on. After all cables changed, the stress state of full-bridge maintains the original state （before cable replacement）, the basic force state of the structure will not affect, so the structure can be used safely.