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Description of positive and negative cycle drilling
1. positive and negative circulation drilling instructions
1. Positive circulation = bit shotcrete, orifice discharge
2. Reverse circulation = bit sucking and hole feeding
2. Comparison and Troubleshooting of Positive and Reverse Circulation Drilling Rig
1. What is the difference between positive circulation and reverse circulation drilling rig construction?
Answer: Mud pump is used to pump mud directly from the slurry tank to the pile tip through the mud pipe. Slag on the mud belt gushes out from the pile mouth, flows into the mud tank through the mud ditch, and then pumps into the pile tip after filtration. This is the circulation process of the positive circulation pile machine. The reverse circulation pile machine is opposite. The mud inlet of the mud pump is at the pile tip, and the outlet is at the mud pit. After filtering, it enters the pile mouth through the mud ditch.
2. Is it determined which one to use according to geological conditions? Is there any difference in drilling speed?
Answer: The reverse circulation drilling rig pumps slurry at the tip of the pile, causing negative pressure. It should be used with caution in unstable geology. When the reverse circulation mud cannot flow into the pile mouth from the mud ditch in time, the mud surface is too low, which is easy to cause hole collapse. Because the reverse circulation is to draw the slag directly from the pump pipe, the drilling speed is theoretically the reverse circulation drilling speed. It will actually be faster.
3. Which kind of wall protection is better for positive and negative circulation operation?
A: The quality of the protective wall seems to have nothing to do with this, only with the drilling speed and mud weight. The drilling rod and drill bit are driven by the rotary device of the drilling rig to rotate and cut the broken rock and soil, and the mud is pumped into the drill rod by the mud pump. The mud rises along the hole wall, overflows from the orifice overflow hole into the mud pool, and returns to the circulation pool after sedimentation treatment.
4. What is the difference between the positive circulation drilling rig and the reverse circulation drilling rig in the construction?
Reverse circulation rotary drilling hole-forming method in which the drill pipe and drill bit are driven by the rotary device of the drilling machine to rotate and cut the broken rock and soil, and the circulating wall-protecting mud is pumped by means of pumping, air lifting, injection and other measures, and the drilling slag is sucked out of the hole from the inner cavity of the drill pipe.
