Geometric Closure Control of the Main Channel Girder of Jiaxing-Shaoxing Bridge

Abstract

The main channel girder of Jiaxing-Shaoxing Bridge is the first six-tower, separate-deck, space four-cable-plane cable-stayed bridge in the world. The main bridge has seven closures, and the closure scheme is complex. Considering the problems in traditional temperature closure, this study introduced a new closure process called geometric closure based on geometric construction control. Then, this study introduced a closure attitude adjustment calculation method and enumerated the considerations in selecting geometric closure for the main channel bridge. Finally, the operating details that implement geometric closure for Jiaxing-Shaoxing Bridge was introduced. Geometric closure can eliminate the additional effect of temperature and ensure the established closure time. The measurement data show that the profile of the main girder of Jiaxing-Shaoxing Bridge is smooth and that the error is small with geometric closure. As a result, the construction control work achieves satisfactory results.