Two-Way Pre-Stressing Technology Applied to Large-Scale Aqueduct of Tanglai Channel through Beita Lake

In view of particularity of the Tanglai channels aqueduct，which crosses Beita Lake, the conventional construction methods and technologies fail to work, so the new two-way pre-stressing technology is employed. After the sidewalls in large span structures of aqueduct were pre-fabricated and hoisted，the secondary floor was poured in design and construction plan. The results show that the comprehensive function of aqueduct is implemented in complicated conditions，such as short construction period，larger span of structures，navigation under aqueduct，pre-fabrication and hoisting of larger sidewalls. The stress and deformation of aqueduct meet the requirements of design code.