Key Techniques for Construction of East Anchorage of the Lingdingyang Bridge on Shenzhen-Zhongshan Link

Abstract The Lingdingyang Bridge is a (580+1666+580m) two-tower three-span sea steel box girder suspension bridge. east anchorage adopts figure eight-shaped ground connecting wall foundation. has diameter of 107.1m and width 65m. thickness 1.5m. the maximum depth 63m, embedded medium weathered granite 5m. overburden nearly 50m, bedrock above 80Mpa 10m, excavation foundation pit 42m. anchor body diamond shaped anisotropic body, with total volume 93000 m 3 . “locking pipe piles + I-shaped sheet parallel wire ropes” combined island-building cofferdam, island 150m. There are 79 groove sections in wall. Three-axis mixing used to reinforce joints both sides before grooving. technique alternately forming grooves by “rotary drilling milling machine” adopted. deep unearthed together portal frame telescopic boom excavator, lining constructed hanging form. After excavation, waterproof effect obvious, safe reliable. layer 2m large amount limestone powder concrete, post pouring section set at same time. temperature 65 °C, crack control obvious.