特大跨径悬索桥主缆PPWS施工，索股数量多、牵引距离长，广泛采用可以连续过塔的门架拽拉式牵引系统进行索股架设。牵引力的准确计算对牵引设备选型、确保工程顺利实施具有现实意义。在早期悬索桥建设中，牵引设备能力需求和选型主要依靠经验选取，探索了PPWS施工门架拽拉式牵引系统牵引力计算方法，与工程现场实测比较，计算结果可靠，可以用于工程施工计算。

For the large number of wire strands and the long distance of strand traction, the wire strands are erected normally with gantry pulling traction system that allows continuous pylon passing in the construction of main cables with PPWS(prefabricated parrel wire strand) method for an extra-large span suspension bridge. The accurate calculation of traction force is of realistic significance to the selection of traction equipment and ensuring smooth construction. In early days of suspension bridge construction, the capacity demand and type of traction equipment were determined mainly based on experience. In this article, exploration was made for the traction force calculation method of the gantry pulling traction system for PPWS construction, and the results were compared with measured data on work site. It proves that the calculation result is reliable and can be used in construction calculation.