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Question:

What are the hidden dangers during the construction stage of rotary drilling rig?

What are the hidden dangers during the construction stage of rotary drilling rig?

Answer:

A rotary drill is used in the high water level areas or Plains. The soil is clay, water silt, silty soil, artificial backfill and gravel, gravel stratum containing part. The digging process is the basic soil mud rushed out, not every time to pull the bit put out the soil, it is necessary to use mud, but this wall is very fragile, whether it is empty or keep drilling, hole inside and outside of the head, the water is too high to slurry leakage and hole collapse, the water level is too low will be water seepage hole collapse into the hole. But the speed is very fast.
You said the dry operation of rotary bored pile is that track rotarydiggingmachine (Sany more) in the hole on the drill directly under the earth, next to a loader pushed the dry soil in time. This caterpillar rotary drilling friction pile in Loess Plateau is appropriate. The water level is low, the length of pile formation Little Rock. The rotary drilling speed, no water, no hole collapse, no wall. But hit the water and rock layer is more trouble.
The rotary drilling cast-in-place pile is also divided into dry hole, soil sampling rotary pile and reverse and reverse rotation pile
Hole air quality, hole wall quality, water gushing, quicksand and other geological conditions, orifice protection, safety protection inside and outside the personnel hole, mechanical equipment operation conditions, probably on these, one, a good grasp on the fine.

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