Is there a need for slurry retaining wall for rotary drilling cast-in-place pile?
Dry rotary drilling, drilling, drilling into the hole do not need mud, there is water in the hole, it is easy to collapse. Therefore, dry rotary drilling does not require slurry wall protection. In the course of drilling, a wet mud wall is formed on the hole wall by drilling and extruding, and the mud is separated from the ground water.
Wet rotary drilling must first transfer mud to drill holes, and the hole and impact drilling almost all need mud. The drill only has the rotary digging tooth, without the rotary digging bucket, the disturbance soil stirs in the hole, pulls out the drill, the drill does not need to carry up the soil every time. It's not dry soil, it's mud. There should be a sedimentation tank in the field, and dig out the gravel and thick mud with the excavator.
Dry rotary drilling is the use of caterpillar rotary drilling directly drilling soil, and then the use of rotary bucket bucket quickly put out of the hole, out of dry soil. Excavated, placed around the rig, with other machinery shipped out of the site. Generally, the bucket is not too big, about one meter high, and the digging bucket is full of disturbed soil. Therefore, the site needs at least a loader to push aside, does not affect the next bucket of digging bucket.
The rotary drilling adopts the form of power head, and uses the powerful torque to directly dig the soil or gravel and so on. First of all, the rotary drilling, drilling technology and impact drilling, artificial hole separation.
