What is the difference between rotary drilling rig and impact drill and rotary drilling rig
Release time:
2021-04-14
One. Analysis of percussion drill
Percussion drilling machine belongs to a kind of hole-forming mechanical equipment of "hard and soft eating together", which is basically suitable for various geological environment conditions, from cohesive soil, sandy soil to gravel layer, river pebbles, boulders to soft rock and hard rock. The percussion drill is especially suitable for the hole formation of rock-socketed piles in hilly terrain in mountainous areas. When the surface is soft soil, the drilling rig can be firmly fixed according to the backfill soil layer.
The impact drill can also be assembled independently according to the specific conditions of the construction site, and has the characteristics of simple actual operation. In the construction and operation process of the drilling rig, the impact drill is better than the rotary and rotary drilling rig. If only from the geological environment standard consideration, does not take into account the construction progress, economic benefits, impact drill can be applied. In terms of pore-forming rate, in a special geological environment, the impact drill is not as good as the rotary and rotary drilling rigs. In terms of the cost per linear meter of double-hole drilling, the impact drill is the largest, the rotary drill is the least, and the rotary drilling rig is close to the two.
II. Analysis of Rotary Drilling Rig
Regardless of the positive circulation system or sub-circulation system in the rotary drilling rig, it is suitable for cohesive soil, soil layer containing a small amount of gravel, river pebble, and soft rock, and is not suitable for many river pebble layers and hard rock layers. In which the positive circulation system drilling rig is also suitable for silty sand, fine medium coarse sand layer. If the index value of mud conditioning is insufficient or the drilling speed is too fast, it may lead to the safety accident of hole collapse.
Rotary drilling rigs are especially suitable for friction pile drilling in plain areas with thick alluvium in inland areas and coastal urban beach areas. From the analysis of the hole forming rate, the rotary drilling machine is faster than the impact drilling machine, which is not as good as the rotary drilling machine. From the analysis of the project budget, the rotary drilling rig is the most economical development of the three kinds of drilling rigs, the most cost-effective.
Three. Impact and Insufficiency of Rotary Drilling Rig
Comprehensive above, the characteristics of impact drilling machine and rotary drilling machine are that their own machinery and equipment are low in price and simple in actual operation. After decades of selection in the sales market, they have already become popular mechanical equipment for pile foundation hole formation. However, with the development and development trend of social development, some insurmountable defects have gradually emerged:
environmental pollution
Slurry hole piles and floating particulate matter must be slurried, and the slurry will cause air pollution on the spot and the surrounding environment, which cannot meet the requirements of ecological environment protection and safe and civilized construction that are increasingly valued by the development of today's society.
Circulation system mud, sediment must be mud pit, which requires a large construction site.
Pore-forming speed is relatively slow
According to all normal construction quality regulations and general geological environment geological structure conditions, the rotary drilling machine punches 8-lOm up and down every day, while the drilling rate of impact electric drilling slows down.
In addition to the strong adaptability of the impact drill, the rotary drill can not cope with the more hard geological structure other than strong weathering.
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