Rotary excavation construction | Zhongshan City Eastern Outer Ring Expressway

Project Location:Zhongshan City, Guangdong Province

Device Model:SR505

Pile diameter:1500mm、2000mm

Pile Depth:50~60m

Geology:0~12m silty clay

12~50m silty clay and sand layer

50-70m strongly weathered and moderately weathered mixed rock, broken rock

Construction technology:12m long casing and mud wall construction

Construction Method:SR505 weighs 175 tons under construction, according to the thick layer of geological exploration silt and poor bearing capacity of the foundation, in order to ensure the safety of construction, the gravel is used to pave thickly, and the front end of the subgrade box tiling is carried by two pieces of I-beam.

The low speed and slow footage of the silt layer prevent suction drilling and protect the hole wall from shrinkage

The crushed rock is constructed by an extended drill bucket to improve the high verticality of the hole, and the multi-floating pressure prevents the drill bucket from misaligning

The construction of large models should focus on the safety of the construction platform, especially the construction status of the water trestle

The whole hole forming time is 18~22h.