The relationship between rotary drilling and impact drilling and reverse circulation drilling
Is a rotary drill hole construction process operation for building foundation engineering. Widely used in construction engineering to municipal infrastructure construction, highway bridges and high-rise buildings, with different tools, suitable for dry or wet (short spiral), (bucket) and rock (Yan Xinzuan) of the drilling operation, with large installed power, large output torque, axial pressure, flexible rotary drilling rig, high construction efficiency and function characteristics. To adapt to the soil geological conditions in most parts of the rotary drilling rig, the use of a wide range, can basically meet the needs of bridge construction, the use of high-rise building foundation engineering. While the impact drill is to rely on rotary and percussive work. A single shock is very slight, but a shock frequency of more than 40000 minutes per minute can produce continuous force. Used of natural stones or concrete. When the impact drill works, the drill chuck is provided with an adjusting knob, which can be adjusted in two ways: an ordinary hand drill and an impact drill. So they are unique and have no circulation relationship
Positive and negative cycle is another process, which is used to break the soil into small particles or mud, and the positive circulation is to use the pipeline to drill into the drilling site, and the orifice is discharged. Reverse circulation is drilling site pumping, orifice grouting. It can be used either as a roundabout or as an impact. Impact is the use of heavy hammer or DTH hammer broken soil, mostly mostly using positive cycle process.
The main difference is the construction process. Rotary drilling rig adopts the technology of making mud, drilling bucket, rotating soil and injecting hole. Mud does not produce circulation.
