Comparative Analysis of Rotary Drilling Rig, Percussion Drill and Rotary Drill
The following is an analysis comparison between the three most common drilling rigs, impact rigs, rotary rigs, and rotary drilling rigs.
First, analysis of impact rig
Impact rigs are suitable for almost all geological conditions, from cohesive soils, sandy soils, to gravel layers, pebbles, pumice stones to soft rocks, hard rocks. Impact drills are particularly suitable for hole formation in rock-socketed piles in hilly hills. When the surface layer is weak soil, you can replace the surface soil to stabilize the DTH rock drilling rigs.
Second, analysis of rotary rig
Rotary rigs, regardless of the forward circulation or reverse circulation drilling rigs, are applicable to cohesive soils, soil layers containing a small amount of gravel and pebble, and soft rocks. Among them, the positive circulation rig is also suitable for silt and fine medium coarse sand layers. Reverse circulation rig In the sand layer, if the mud regulation index is not enough or the rig speed is too fast, it may cause a hole collapse accident.
Third, the shortcomings of impact and rotary drilling rigs
To sum up, the common features of percussion rigs and rotary rigs are that the equipment itself is cheap and easy to operate. After decades of market selection, it has become a mainstream machine for pile foundation hole formation. However, with the progress and development of society, some insurmountable shortcomings have gradually been exposed:
Pollute the environment, not environmentally friendly
Both mud wall protection and suspended particle slag discharge require mud, and the mud causes environmental pollution to the site and the surrounding environment, which cannot meet the requirements of environmental protection and civilized construction that are increasingly valued by contemporary society. Circulating mud, sedimentation and slag need mud pool, which will occupy a large construction site.
Slow hole formation
According to normal construction quality requirements and general geological formation conditions, rotary truck mounted drilling rigs drill about 8-10m per day, while percussion drilling is slower.
In addition to the strong adaptability of impact rigs, rotary rigs cannot cope with harder formations other than strongly weathered formations. Both impact drills and rotary drills can only drill vertical holes, not inclined holes. The degree of automation is low, the labor intensity of the operating workers is high, and the working environment is poor. The impact rigs and rotary rigs are not highly automated. They are basically open-air operations, and the working environment of workers is harsh.
Truck Mounted Well Drilling Rig
Fourth, the analysis of rotary drilling rig
Dry hole formation will not cause pollution to the site and surrounding environment. Even when using static mud to form holes, compared with the impact of rotary drilling rigs and rotary drilling rigs, rotary drilling rigs have less pollution on the site.
Fast hole formation
In general formations, the speed of rotary drilling rigs is 4-6 times that of ordinary rigs. According to the estimation within 30 meters of the general stratum and bridge pile length, and in accordance with the normal quality control requirements for hole formation of a pile foundation, the formation of a qualified pile foundation for a hole, the rotary drilling rig is about 24-36 hours. The skilled rotary drilling rig operator is equipped with a technician to guide the drilling, and the pile foundation only takes 6 to 9 hours to form a hole. The advantages of rotary hydraulic drilling rigs are obvious in this regard.
Rotary drilling rigs can be equipped with different drill bits. Common rotary drilling bits include auger bits and rotary buckets. In addition, there are barrel core drills, outreaching drills, impact drills, and punching cone drills for different geological conditions. They can be used for sand. Layer, soil layer, rock layer and other strata.
The rotary drilling rig is self-propelled by the crawler, and the positioning before drilling is very accurate and convenient. Rotary drilling rigs can not only drill vertical piles but also inclined piles. Highly automated, low labor intensity and comfortable working environment. Rotary drilling rig is the product of high power, full hydraulic pressure, electromechanical integration, and comfortable operation (humanization). It is the crystallization of contemporary high technology, which embodies the centralized unity of humanization, intelligence and high efficiency.