One is double cable crane\|double shoulder pole beam positioning and installation system, the other is replacement of winch\|block pulley fastening anchorage cable system with assembly prestressed fastening anchorage cable system.

The arch ring is constructed by hang-basket,and the cables are pulled to control the line shape of the naked arch at the same time.

This paper introduces the measurement principle of a cable tention under random excitation,and discusses respectively the natural frequency identification methods for a cable in the frequency domain and the time domain,as well as other problems about the measurement technique.