4.This paper introduces the actual operating course of the truss hoisting with herringbone rotating longeron supported by concrete frame.
介绍利用砼框架支撑人转动桅杆吊装桁架的实际操作过程。
5.Nowadays, slop roof consists of steel column and beam or steel truss and purling, and connected with existed building by concrete beam cast in place, is being used commonly in this project.