Rotary drilling rig construction case | Nanjing Metro Line 6 Yanyao Road Station Foundation Pit Support Project

Project Name:Nanjing Metro Line 6 Yanyao Road Station Foundation Pit Support Project

Contractor:CCCC First Public Bureau Group Co., Ltd

Device Model:SR400W

Pile Diameter:1.0m

Pile Depth:29.5-35m

stratum：0-29m silt layer, below 29 is moderately weathered sandstone

Construction technology:Build the guide wall, select the drill bucket and casing, use the power head of the rotary drilling rig to apply torque and downward pressure to the casing, and lower the casing into the silt until the upper end of the casing is 0.5~1m above the ground, then disconnect the connection between the casing and the driving flower tube, and continue to dock the next section of the casing while drilling in advance, until the design depth, pour concrete, and pull out the casing.