Linear Monitoring Technology for Long Span Prestressed Concrete Continuous Rigid Fram Bridge

The upper structure of Ronggui water channel major bridge of newly built Guangzhou-Zhuhai intercity rail transit engineering is a continuous rigid frame of(108+185+185+115)m.During pouring the cantilever of upper structure, based on theoretic calculation,the integrated structure linear condition has been figured out through real time monitoring and dynamic adjustment.Its precision has been limited within 2 cm while the closure error is just excellent 0.8 cm,and the construction linear is matched with designed one.Therefore,it has met the design requirement in construction linear and stress condition,and satisfied the high smoothness and stability in operation and high comfort for passenger of high speed railway.