Combining with some four-span prestressed continuous bridge engineering in Xi an,the monitoring controls of stress state and geometric alignment during cantilever hanging basket construction of long-span bridge are introduced.

Combined with the practical construction condition of the curve cast-in-site continuous beam, the article stresses to set forth the control of the sectional construction alignment of the cantilever form traveler and the construction technology of the closure section, and introduces some key problems met in the course of construction and some error-correcting methods.

Matters needing attention as changing scheme from balanced cantilever erection to slide construction method;

The balanced cantilever erection workmanship, construction method,the principal construction technique features and construction survey control for the main spans of Nansha Bridge were introduced in this paper.