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6890017 
Journal Article 
Construction and Geometry Control of Incheon Cable-Stayed Bridge 
Yang, JHo; Im, DukKi; Kim, CH; Ahn, SSup; Lee, WanSoo; , 
2012 
1 
Structural Engineering International
ISSN: 1016-8664 
IABSE 
ZURICH 
49-52 
WOS:000311979600012 
The Incheon Bridge is a continuous span steel deck cable-stayed bridge with six traffic lanes in dual direction. Its total length is 1480 m including an 800 m centre span. The pylon was designed as an inverted Y-shaped concrete structure of 238 m in height. The pylon consists of four parts, namely the lower part, cross beam, middle part and upper cable anchorage part. The pylon was constructed by being divided into 57 lots of 4 m height, and auto-climbing form was applied. The cross beam was prefabricated at the factory to save construction time and was erected by using a floating crane. In order to control the geometry and secure the stability during construction, temporary tie and struts were installed and tensioned. For the superstructure erection, the side span was fabricated as four large blocks, which weighed 27 000 kN at the factory and was erected on temporary bents by using a 30 000 kN floating crane. The centre span was fabricated as a 15 m long block weighing 3000 kN and erected by a derrick crane along with the stay cables. A total of 208 cables were installed in a semi-fan shaped arrangement and four cables were stressed simultaneously. An integrated geometry control system was developed and applied for geometry control and cable adjustment during the erection. Four systems, namely, data integrated management system, structural analysis system, error adjustment system and measurement system, were employed. Approximately 6 to 7 days of cycle time was achieved for the superstructure erection within the allowable limits of geometry and cable tension. This paper presents the construction and geometry control system applied in the Incheon cable-stayed bridge.