Cable construction method of self anchored suspension bridge
Self anchored suspension bridge is an ancient bridge type, which is different from general suspension bridge. Its main cable is directly anchored at the end of the stiffening beam, and the main beam directly bears the horizontal tension in the main cable, without huge anchorage, which provides a solution for the construction of suspension bridges in places where it is not convenient to build anchorage. Construction method characteristics 1. Compared with the traditional self anchored suspension bridge, which only tension the cable, the cable force and beam shape are easier to control. 2. Each main cable and steel strand of each sling are tensioned in place at one time without cable adjustment, which ensures that the cable is not damaged during tensioning, and enhances the durability and safety of the cable. 3. The construction method is simple, and the process can be directly controlled by the "double control method" of prestressed construction. Scope of application This construction method is applicable to the construction of the upper cable structure of self anchored suspension bridges, and has certain reference significance for other types of cable bridges. Construction technology (I) Process principle Tension the main cables and slings in batches. Each batch of slings shall be tensioned first. The tension of the slings shall be balanced by the pressure borne by their outer steel pipes, that is, the tension generated by the slings shall be stored in the outer steel pipes of the slings; Then, tension the main cable, release the pressure of the steel pipe of the sling through the hoop of the main cable, and convert it into the balance of the force between the main cable and the sling.