Rotary excavation construction | China Railway Construction Bridge Engineering Bureau Group Co., Ltd. Langying Expressway

Project Location:Nanchong City, Sichuan Province

Device Model:SR435S

Pile diameter:2200mm

Pile Depth:50~55m

Geology:The height of the cap is 10m, the water depth is 12m, and the silt and fine sand are 22m~30m

30m~40m strong weathered argillaceous sandstone

40m~ weathered argillaceous sandstone in the final hole

Construction technology:Long casing mud wall protection construction technology

Construction Efficiency:The upper part adopts Ф2.2m pick sand fishing bucket for one drilling;

30~40m with Ф1.5m→2.2m pick sand bucket graded drilling;

The 40m~final hole adopts Ф1.5m→Ф1.8m→2.2m pick barrel drilling, pick sand bucket with the construction of graded drilling;

The whole hole forming time is 20~22h.