Rotary drilling rig, also known as piling rig, is a comprehensive drilling rig which can be used for a wide range of substrates with fast hole making speed, less pollution and high mobility.
The short auger bit can be used for dry digging, and the rotary bit can also be used for wet digging with mud shield. The rotary drilling rig can cooperate with the punch hammer to drill hard strata before performing hole digging operations.If equipped with a reaming head drilling tool, reaming operations can be performed at the bottom of the hole. The rotary drilling rig adopts multi-layer telescopic drilling rod, with less drilling auxiliary time, low labor intensity, no need for mud circulation and slag discharge, and cost saving, which is especially suitable for foundation construction of urban construction.
Main performance characteristics of rotary drilling rig
1. Strong mobility and quick transition.
2.Various types of drilling tools，lightweight, fast loading and unloading.
3.It is suitable for various strata and has a fast speed, about 80% faster than percussion drilling.
4. Low environmental pollution, no need to recycle slag.
5. It can correspond to various types of piles.
How to choose the drill bit of rotary drilling rig
The selection of rotary drilling rig bits is mainly based on three aspects: stratum conditions; drilling rig functions; hole depth, hole diameter, ballast thickness, wall protection measures, etc. Common rotary drilling bits include auger bits, rotary drilling buckets, cartridge core bits, bottom-expanding bits, impact bits, punching-grabbing cone bits and hydraulic grabs.
Since the ground conditions are ever-changing, the object of rotary drilling rig work is particularly complex, and the corresponding drill bit should be selected according to different geological conditions, mainly in the following categories:
1.clay: use the commonly used straight-tooth conical bucket drill bucket, which is fast in drilling and easy and convenient in unloading soil;
2.Sludge, weak cohesive soil layer, sandy soil, poorly cemented pebble layer with small particle size: equipped with a double bottom drill bucket with spiral teeth;
3.Hard cement: use single soil inlet (single and double bottom can be used) rotary drilling bucket, or bucket tooth straight screw;
4.Frozen soil: Use straight screw bucket with bucket teeth and rotary auger bucket for low ice content, and conical auger bit for high ice content. It should be noted that the auger bit is effective for all soil layers (except silt), but it must be used in the absence of groundwater and stable stratum to avoid jamming due to suction;
5. cemented gravel and strongly weathered rocks: need to be equipped with conical auger bit and double bottom rotary drilling bucket (particle size with a single mouth, small particle size with two mouths), with alloy bucket teeth (bullet) effect is better;
6.Medium-weathered bedrock: in accordance with the sequence of processes, it can be successively equipped with truncated cylindrical coring bit → conical auger bit → double-bottom rotary drilling bucket; Or truncated straight auger bit → double bottom rotary drilling bucket;
7.Slightly weathered bedrock: According to the sequence of the process, it is equipped with roller cone core bit → conical auger bit → double bottom rotary drilling bucket. If the diameter is too large, a graded drilling process must also be adopted.
The selection of drill bits for rotary drilling rigs is not only based on geological conditions, but also needs to be combined with the needs of the construction and the construction environment. Pay attention to the verticality of the drill mast during the drilling process to avoid drilling tilt.
Gookma Technology Industry Company Limited is a hi-tech enterprise and a leading manufacturer of rotary drilling rig, concrete mixer and concrete pump in China.
You are welcome to contact Gookma for further inquiry!
Post time: Mar-28-2023
