The main reason is because the bridge closure, temporary support, removal or addition of constraints, the system stress of bridge structure by the beam into continuous beam, or by the static structure into a statically indeterminate structure, or by N statically indeterminate structure into N+ (-) M statically indeterminate structure.
As for the bridge engineering refers to the transformation of the system, refers to the bridge structure of the force system changes
The construction of the bridge hanging basket is mainly used for continuous beam or continuous rigid frame bridge
