Rotary drilling rig, as a kind of hole-forming machinery and equipment that has been accepted by everyone in recent years, has been widely recognized in the construction of underground foundation engineering. It has become a new type of pile hole engineering construction method with faster development trend in recent years. The technology of rotary digging and punching cast-in-place pile is called "emerald green construction technology", which is characterized by high working efficiency, good construction quality and less dust and mud pollution. But some problems have also occurred. Now on the rotary drilling rig and the past common impact, rotary drilling rig to carry out more, on how to choose in the pile foundation construction into a hole mechanical equipment to draw several aspects of the proposal.

1. Analysis of impact drill
The percussion drill belongs to a kind of hole-forming mechanical equipment that is "hard and soft. Basically, it applies to a variety of geological situations. From dry soil, sandy soil, to gravel layer, river pebble, boulder to soft rock, 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, it can be replaced according to the soil layer. And seek to hold the rig firmly.
The impact drill can also be assembled independently according to the specific conditions of the construction site. Moreover, it has the characteristics of simple actual operation. On the construction of the rig and the speed of the operating process. Impact electric drill is better than rotary and rotary drilling rig. If only from the geological criteria to consider, do not take into account the construction progress, economic benefits. Impact electric drill can be applied. From the pore-forming rate. in special geology. The impact drilling machine is not as good as the rotary drilling machine. From the double hole hole into the hole per linear meter of the project cost to carry out more, the impact drill is the largest. Rotary drilling rig at least. The rotary drilling rig is close between the two.
2. Analysis of rotary drilling rig
Drilling rigs in rotary drilling rigs, regardless of the positive circulation system or the sub-circulation system. All of them are suitable for dry soil, soil layer containing little gravel, river pebble and soft rock. For discomfort, use large stone layer and hard rock layer. In which the positive circulation system drilling rig is also suitable for fine sand, fine medium coarse sand layer. If the index value of mud conditioning is insufficient or the drilling speed is too fast in the weathered layer. It is likely to cause a safety accident in the field hole.



 

Rotary drilling rigs can be used especially in plain areas with thick alluvium in inland areas and in tidal flat areas of coastal cities. In terms of hole-forming rate, the rotary drill is faster than the percussion drill. Not as good as a rotary drilling rig. From the project budget analysis. Rotary drilling rig is the most economical development of the three kinds of drilling rigs, the most cost-effective.
3. Insufficiency of impact and rotary drilling rig
Comprehensive said. The same characteristic of percussion drills and rotary drills is the low price of their own machinery and equipment. The actual operation is simple. After decades of sales market selection. Has long become a pile foundation into the hole of the popular mechanical equipment. But with the development of the powder society development and development trend. Also gradually revealed some difficult to overcome the defects:
Environmental pollution, no environmental protection
Mud hole piles and floating slagging must be mud paddles. The mud causes air pollution on the spot and in the surrounding natural environment. It is impossible to meet the requirements of ecological environment protection and safe and civilized construction, which are increasingly suitable for the development of today's society. Circulating system mud. Sedimentary participation must be mud pool. This requires a large construction site.
Pore-forming speed is relatively slow
In accordance with all normal construction quality regulations and general geological geological conditions. Rotary drilling rig drilling 8-10 m up and down per day. The impact of electric drilling into the hole rate is slower.





 

poor adaptability
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. The percussion drill and the rotary drill only drill vertical hole, can not drill hole.
Low level of automation technology
The actual operation worker labor efficiency is big. Poor office environment The level of automation technology of impact drilling rigs and rotary drilling rigs is not high. It's basically the actual operation of the ear. The harsh environment in which workers work. Has not been in line with today's social development of personalized and high-aspect ratio automation technology fashion trend.
4. Analysis of rotary drilling rig
Environmental Protection Environmental Health
When thousands of methods into the hole, it is not easy to on the spot and Zhou Tong natural environment lead to environmental pollution. Even when static data mud is used to form holes. Relativity to environmental pollution of percussion drill and rotary drill. The rotary drilling rig causes less environmental pollution on the spot.