Study On Demolition Method Of PC Cable-stayed Bridge With Double Tower And Double Cable Plane

With the rapid development of China's traffic engineering,many bridges built in the last century do not meet the operational needs,many bridges need to be dismantled and rebuilt.The demolition of bridges is fundamentally different from that of new bridges.Different bridge types should choose reasonable demolition methods according to their structural characteristics and environmental factors.At present,the demolition of bridges in China is only regulated according to the norms of girder bridges.The research on demolition of the long-span cable-stayed bridge and suspension bridge is basically in a blank state.In this paper,the demolition method and construction control of cable-stayed bridge are discussed and analyzed in combination with the demolition work of engineering examples.This paper discusses the stability analysis of cable-stayed bridges,including the basic theory and methods of stability analysis of a cable-stayed bridge.Through the study of the demolition method of cable-stayed bridge,the process of demolition is worked out.The static cutting method is adopted for the prestressed concrete(PC)cable-stayed bridge with double-tower and double-cable plane,which combines the structural characteristics of the bridge itself and the influence of the surrounding environment were studied in this paper.Based on the static cutting method,two demolition schemes are put forward,and a comparative analysis is carried out.Finally,a single-braced hierarchical release cable force cutting method is adopted(a temporary brace is set up in the middle of the main longitudinal beam span,and the graded release cable force is gradually dismantled to the bridge).The process of demolition is simulated and calculated,the main components such as beam,tower,pier and so on are checked and calculated,and the static analysis of the bridge structure in each stage is carried out.The results show that the method is safe and feasible.In this study,the demolition was put forward.A new method of cable-stayed bridge on the channel also puts forward the problems that should be noticed in the process of demolition(to ensure the sudden danger of bridge demolition,to set up a temporary brace and a temporary horizontal brace).The concrete measures for monitoring the demolition of cable-stayed bridges are put forward in this paper.Suggestions are also given for the detection and performance evaluation of bridge demolition,the calculation method of construction control and the determination of monitoring warning value.The research on the demolition technology of PC cable-stayed bridge with double-tower and double-cable plane provides a new idea for the study of various methods of cable-stayed bridge demolition and provides a brand-new idea for the follow-up study of cable-stayed bridge demolition.It has certain reference significance for issuing the demolition code of cable-stayed bridge as soon as possible.