Definition, historical background and development course of hanging basket construction

6 Construction of Hanging Basket-Overview of Construction Technology of Long-Span Cable-Stayed Bridge 1 Definition of Cable-Stayed Bridge 1. 1 is a bridge where the deck system is under pressure and the supporting system is under tension. The bridge deck system is composed of stiffening beams, and the supporting system is composed of steel cables. With the development of materials science and computer science, a large number of cable-stayed bridges have been built at home and abroad since 1956, when the Romson Bridge in Sweden opened the apex of modern cable-stayed bridges, and their spans are gradually increasing. Cable-stayed bridge has developed rapidly with its advantages of large span capacity, good structural performance, simple construction, convenient maintenance, low cost and light and beautiful appearance. 1.2 structural characteristics of cable-stayed bridge The main feature of cable-stayed bridge is to use stay cables led out from the tower as elastic intermediate supports for the collapse of the beam, so as to reduce the section bending moment of the beam, reduce its weight and improve its spanning capacity. Of course, this elastic supporting effect of stay cables on beams can only be fully exerted when the stay cables are always in a tight state. Therefore, the cables must be pretensioned before bearing the load. This pre-tension can also reduce the stress variation range of the cable and improve the stiffness of the cable, thus improving the stress state of the structure. In addition, the horizontal component of the cable can prestress the main girder in the axial direction, which can enhance the crack resistance of the main girder and save the amount of high-strength steel.