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Abstract Sichuan kahalo Jinsha River Bridge is a suspension bridge with a main span of 1030 m, and the anchorages on both sides are gravity anchorages. In order to adapt to special terrain and geological conditions, anchorage of Sichuan bank pioneered the use of frame structure as the anchorage foundation. The soil and the frame structure jointly bear the vertical load and resist the horizontal component of the main cable to form a "frame soil" community and fully mobilize the role of the undisturbed soil. In order to ensure the integrity of the frame structure, the indirect head of the slot section adopts a rigid joint. At the same time, the distributed grouting technology is used to strengthen the soil around the frame structure, so as to further improve the safety factor. This paper introduces the topography and geology of the anchorage position, compares and selects different anchorage foundation schemes, and explains in detail the design concept, structure size and construction technology of the frame foundation. The research shows that using frame structure as anchor foundation is not only reasonable, safe, good economy, but also environmentally friendly. It has solved the difficult problem of anchorage design under poor terrain and geological conditions, and will provide a good reference for the design of mountainous suspension bridges in similar condition. |
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