The Kwang-An Grand Bridge in Pusan is a suspension bridge with a central span of 500m and side span of 200m for a total length of 900m. Because Pusan City was developed linearly from the south to north direction, traffic congestion has caused a serious problem. To solve this problem, an outlying loop highway is presently constructing on the sea, which includes the Kwang-An Grand Bridge. Although there are not so much experience and know-how for the construction of suspension bridges in Korea, a suspension bridge of which both pier and anchor block are located on the sea is a rare case in the world. This paper introduces a case history for deep foundation (anchor block) of suspension bridge as an offshore structure. The results of plate bearing test and in-situ direct shear test at the position of final excavation level of the anchor block indicates that the bearing capacity is not sufficient. So the bearing capacity and in-situ shear strength were estimated by analyzing the results of plate bearing tests and in-situ direct shear tests.Also, the micro pile method as a countermeasure to improve the deformation modulus of beating ground was adopted through a test construction.
This paper introduces a case history for deep foundation of a suspension bridge, the Kwang-An Grand Bridge with central span of 500m in Pusan, as an offshore structure. This paper also describes the results of plate bearing test and in-situ direct shear tests at the position of final excavation level of the anchor block and the improvement of the deformation modulus of bearing ground by the micro pile method.
Monitoring Fig.6 indicates the plan figure of locations of monitoring points. The excavation depth was about 35m where the ground condition was weathered rock.