Rotary excavation construction | Heilongjiang Heyi Expressway Tangwang River No. 1 Bridge

Project Location:Hegang City, Heilongjiang Province

Device Model:SR435S

Pile diameter:1600mm

Pile Depth:25~30m

Geology:0~17m gravel, mudstone and sandstone

17~20m strongly weathered granite

20m~final hole Medium weathered granite, granite strength 70~90MPa

Construction technology:Dry hole process

Construction Efficiency:The upper part adopts Ф1.6m pick sand bucket for one drilling;

17~20m adopts Ф1.2m→Ф1.6m pick barrel drill, pick sand bucket with the construction of graded drilling;

The 20m~final hole adopts Ф1.2m→Ф1.6m cone barrel drill and pick sand bucket to cooperate with the graded drilling;

The whole hole forming time is 2~3 days.