Lizigou large-span bridge which adopts super-large pile group is one of the main projects on the Neijiang—Kunming railway.

Labajin and Heishigou bridge are the composite structure of long span continuous rigid frame with high-frusta concrete and con- crete-filled steel tube projects,the height of the major frusta of these two bridges are 182.

This paper introduces the design of sixth prestrssing force concrete continuous steel-frame bridge of main span 55m+4x90m+55m of Chugou Great Bridge,from the aspects of overall design,internal force of structure,as well as box beam construction process,etc.

The Study of Ma-Gou Bridge Construction Constrol and Manage Technology;