YTZ series long rotary drilling rig is a kind of multi-functional, low cost and high efficient boring machine for filling pile with functions such as completely electro-hydraulic driven, step walking and **0°rotation etc. This product has characters such as low noise, small vibration, large torque, multi-function, fast speed of bore forming, as well as boring and pile filling finished simultaneously, flexible and agile, and high construction efficiency etc, and is widely used in the construction of pile foundation engineering for high-rise building, urban transport construction etc. and is mainly applicable for loose soil bed, sand layer, sand loam layer, and soil layer that mixed with small amount of small particle gravels.