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We know that the machinery we usually use will always have problems, and the problems are various. Let's briefly introduce the reason why the drill bit of the long spiral drilling rig is widely used.
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 the mud that has been cut is nowhere to be accommodated. 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 of the bucket tooth forms a large amount of mud, which is equal to the height of the bucket teeth, and forms one! At this time, the bucket tooth has lost its cutting action. Under the effect of mud or water lubrication, the drill bucket 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 meet. Reversed with the drill pipe and cannot be closed.
Reason two, dregs fall out
After the reversal, the main roll is lifted. When the drill bucket is lifted in the mud or water, due to the mud or water having a certain resistance, the resistance will generate a downward force on the residue in the drill bucket due to the drill bucket. The drill pipe has a conical shape, and the speed of the rotary excavation is too fast to cause the compaction of the dreg inside the drill bucket to be insufficiently compacted, and the main roll is raised too fast, resulting in falling of the dregs inside the bucket! So not every time the bottom of the bucket is closed, the dreg 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.
Reason five, slipping treatment
〔1〕 Even if skidding occurs, it can be processed. After the second drilling, the thickness of the slag is determined by the data on the display first. After that, the hardness of the geology is reduced. If there is a lot of mud falling, , And it is a hard cement, then change the drill pipe smaller than the pile diameter to solve the slip, due to a large gap between the small diameter drill hole and the hole wall, the soil dropped in Henan Sanli mechanical drill pipe drilling Under the effect of bucket weight and pressure, the gap between the drill bucket and the wall of the hole is squeezed to the side, and the small diameter drill bucket can contact with the real soil to drill normally. When the small drill bucket is lifted, it is squeezed to the side. The virtual soil falls into the small-diameter hole, and the dreg which has not fallen into the small hole is pressed into the small hole by the large-diameter drill pipe after the second drilling, so that the large-diameter drilling pipe can normally drill.
〔2〕If the fallen slag is soft and has good compressibility, then there is no need to change the drill rig, and the repeated operation and pressurization and the forward rotation of the power head are reversed because of the clearance between the power head and the drill pipe. There is also a gap between the drill pipe and the drill pipe. Although drilling and slipping occur at this time, the weight of the drill pipe and the drill pipe are resistant. Therefore, the forward rotation of the drill pipe can be quickly reversed, and the impact force can be generated by using the gap. When the force encounters the weight of the drill pipe drill, it can produce resistance. With resistance, there is reaction force. With reaction force, there is friction. At this time, the pressure can be instantaneously transmitted to the virtual soil on the mezzanine to compress it. Under the muck, the muck is pushed up from the gap between the drill hopper and the hole wall, and enters part of the rig until the bucket tooth comes into contact with the real soil. This must be remembered when the reverse rotation is made. Pressure can be transmitted immediately before pressing.
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