Feasibility Research Of Continuous Second-concrete Balance Turning Construction Of Concrete Arch Bridges With Open Thin-walled Section

swivel erection of open thin-walled arch bridge is a new process which can be used for girders arch bridge. The features it have are that can help reduce gross weight and costs, and convenient for construction . but ,in order to reduce the weight of swing system , wall thickness of the open arch rib should be thinner, which lead to carrying capacity of open thin-walled arch bridge is limited after closure. When second-phase concrete is placed to thicken ventral shield and motherboard, arch rib is usually divided into many sections, and to be placed in an order. Until the intensity of concrete run up to 80% can to carry of next step. So duration needs longer. Besides, it is far away from adjacent section, equipments must move cross, which is inconvenient for construction.Acceding to issues , through the engineering of GuiZhou Huajiang bridge, making research on thickening ventral shield and motherboard by place second-phase concrete to achieve the technology which place concrete from arch springing to vault symmetrically. also making research on the influence of temperature and stability of open thin-walled arch rib during the construction. Rotational structure adapting to continuous casting technology has been put which combining the results, and it doesn't need to add inclined tensioned cable when the second-stage concrete has been continuously poured. The stability of the existing and the new structure has been compared, which provides the reference for the design and construction of the bridge.