On the basis of waterfall Channel Bridge,it analyses and calculates the design of the main action rope,the saddle and anchor hole of main action rope,and tractive rope at length,and introduces the operating principle of the main bearing rope of swinging cable loop wheel machine,gives a certain reference value to the similar bridge construction.

The calculation of the load-bearing cable should be more accurate,because the span of cable crane used in bridges construction becomes larger and larger.

A nonlinear instability mode of torsion for long-span cable-stayed bridges under aerostatic load is proposed, and nonlinear equations to solve equilibrium path are derived out.