One reason: the bottom of the bucket is closed
When the drill rig uses a frictional rod to drill into the water layer, it is necessary to pay attention to the depth of each bucket. If the footage of the bucket is too deep, then the bucket is filled with dirt, and if the mud continues to be drilled, there is no place to accommodate it. At the slag hole of the drill hopper, it accumulates in front of the bucket teeth. When the accumulated mud reaches a certain amount, the front teeth of the bucket teeth form a large piece of mud, which is equal to the height of the bucket teeth and forms an integral part! The cutting action has been lost. Under the effect of mud or water lubrication, the drilling rig cannot continue drilling. Therefore, when the bottom of the bucket is reversed and closed, the bottom of the bucket has no resistance, so the bottom of the bucket will be reversed with the drilling hopper. I can't turn it off.
Reason two, dregs fall out
After the reversal, the main roll is lifted. When the drill bucket is lifted in mud or water, due to the mud or water having a certain resistance, this resistance will exert a downward force on the residue in the drill bucket, due to the drill bucket. The drill pipe has a conical shape, and the too fast rotary drilling results in insufficient compaction of the dregs inside the drill pipe, and the main roll is lifted too quickly. As a result, the dregs inside the bucket fall out! Therefore, it is not always that the bottom of the bucket is not closed. Earth can fall out...
Three reasons: slippage
At this time, the fallen slag has lost the original integrity of the actual soil. Therefore, after the second boring, the tip of the slag is directly inserted into the slag, and the bottom surface of the screed is directly pressed on the slag, and the drilling rig is rotated. Therefore, the level of the fallen scum is completely compacted. When the slag cannot be compressed, the plane of the floor is supported by the slag, and the bucket tooth rotates repeatedly in the already drawn groove. At this point, three layers are formed. The first layer is a drill bucket that rotates repeatedly. The second layer is the fallen soil. The sandwich layer is the second layer. The third layer is uncut solid soil. Since the diameter of the drill hole matches the diameter of the hole, the drill There is no resistance to rotation of the rod → no reaction force → no friction → no pressure, the bottom and falling dregs are slippery under the lubrication of water or mud.
Reason four, prevent slipping
The skidding phenomenon can be overcome by first combining the depth of the single bucket footage on the display. Although the mud drilling resistance is small, as the internal dross of the drilling hopper increases, resistance will be generated to the slag intake, so the drilling resistance is increased, and the sound of the planetary reducer on the power head changes with the resistance, so the sound of the power head is heard. The amount of measurement can be judged. When the drilling resistance rises, the rotational speed of the power head also decreases. Therefore, the drill speed can also be used to judge the amount of advancement. If the geological changes are not large, the time and depth of each boring should be kept within a certain range, and the depth of single-bucket footage should be within 0.5 to 0.6 meters. When reversing and closing the bottom of the bucket, try to drill with a load. At this time, the bottom of the bucket has a certain resistance so as to prevent the bottom of the bucket from reversing with the drill drum.
