Code for Construction of Chanba Second Bridge

Cable-stayed bridges have single tower, twin towers and three towers. Mainly reinforced concrete towers. The types of towers are H-shaped, inverted Y-shaped, A-shaped and diamond-shaped. Traditional parallel galvanized steel wire and cold-cast anchor head are still the main stay cables. At present, Shantou Stone Bridge adopts steel strand stay cables. The application of steel strand to stay cables will undoubtedly simplify the construction operation, but the technology of outsourcing PE needs to be studied. The cables of cable-stayed bridges generally adopt self-anchored system. In recent years, self-anchored and partially anchored cable-stayed bridges have begun to appear, such as the Luna Bridge in Spain, with a main bridge of 440 m; Yunxian Bridge in Hubei, China, with a main span of 4 14m. The ground anchor system integrates the characteristics of ground anchor of suspension bridge into cable-stayed bridge, which can make the span arrangement of cable-stayed bridge more flexible and diverse in combination with terrain conditions and save costs. Construction method of cable-stayed bridge: concrete cable-stayed bridge mainly adopts cantilever pouring and prefabricated assembly; The steel box and steel box of mixed beam skew bridge adopt orthotropic plates, which are welded in the factory and hoisted on site. The connection between steel box and steel box is one of bolts, the other is full welding, and the third is bolt welding combination. Generally speaking, the span of cable-stayed bridge is 300 ~ 1000 m, and in this span, cable-stayed bridge has obvious advantages compared with suspension bridge. F.leonhardt, a famous German bridge expert, believes that even a cable-stayed bridge with a span of 1400m can save half of the high-strength steel wires of the same span suspension bridge, and its cost is about 30% lower. Development trend of cable-stayed bridge: the span will exceed1000 m; Diversified and lightweight structural types; Strengthen the research on corrosion protection of stay cables: pay attention to cable force adjustment, construction observation and control, and study on dynamic problems of cable-stayed bridges.