At present, there are more and more types of rotary drilling rig drill bits. According to the structure and use function of the drill bits, they can be roughly divided into the following categories: sand bucket, barrel drill, auger drill, bottom drill and special drill. Spiral drill bits are more commonly used in rotary drilling rigs. The editor of Huaxia Jiajiang will explain to friends the types of spiral drilling rigs. I hope it will be helpful to friends.
The auger drill has the advantages of simple structure and convenient use. The auger drill can be divided into a variety of different drills according to the number of different screw blades, the arrangement of the teeth, the type of the teeth, and the overall shape.
(1) Double-head single-screw pick-cone spiral drill
Advantages: good loosening effect of compacted gravel formation; large pitch, strong slag carrying capacity; high strength of both heads.
Disadvantages: Large diameter drill blades are easily deformed; when there is groundwater, the effect of carrying soil is not good.
Strata is recommended: Double-headed single-screw truncated cone auger drill bit is suitable for drilling a compacted pebble layer, strongly weathered rock layer, or broken rock layer.
(2) Single head single screw truncated cone auger drill
Advantages: The loosening effect of dense cobblestone stratum is better; the screw pitch is large, and the ability to carry slag is strong.
Disadvantages: Large diameter drill blades are easily deformed; when there is groundwater, the effect of carrying soil is not good; the strength of single head is small.
Strata is recommended: Rotary drilling rig is suitable to use single-head single-screw pick-cone spiral drill when drilling into dense pebble layers and strongly weathered rock layers.
(3) Double-head single screw tooth straight spiral drill
Disadvantages: When there is groundwater, the effect of strip soil is not good; the strength of bucket teeth is weak, and it is easy to break teeth in harder strata.
Advantages: high soil drilling efficiency, strong slag carrying capacity, fast soil unloading.
Strata is recommended: When drilling into a soil layer that does not contain groundwater, a sandy soil layer, or a small-diameter gravel layer with poor cementation, it is suitable to use a double-headed single screw tooth straight spiral drill.
Note: When the soil layer is relatively stable, the height of the drill bit can be increased to improve the drilling efficiency of the pile drill.