Rotary excavation construction | China Railway Sixth Bureau undertook the construction of the No. 1 six-line bridge of the West-Chongqing High-speed Railway

Project Location:Dazhou City, Sichuan Province

Device Model:SR435W, customized forward climbing model

Pile diameter:Ф1200mm、Ф1500mm

Pile Depth:20~30m

Geology:Steel sheet pile cofferdam in the river, set up working platform, water depth 4m~6m, 4m~10m alluvial silt, silty clay, fine sand

10m~15m round gravel soil, pebble soil, gravel soil, breccia soil

15m~final hole weathered mudstone, siltstone

Construction technology:Long casing mud wall protection construction technology

Construction Efficiency:The upper part is drilled once by using Ф1.2m pick sand bucket, and the rock formation is drilled with Ф1.2m rock socketing tube, and if it is 1.5m pile diameter, it is reamed again, and the pick sand bucket is used to remove muck;

The whole hole forming time is 10~15h.