1, multi-usage, drilling implementation ways.
Abroad, and foundation construction with large pile hole drill design make full use of hydraulic transmission technology, modular combination design method, on the basis of the host, achieve multi-usage, in order to meet the large-scale construction machinery adapt to different construction methods. In our country, the use of the short spiral drill or drilling bucket for dry drilling or no circulating mud drilling technology into a device called a rotating drill hole system pile, in fact, it is a kind of adapt to different construction methods of large engineering drilling, except for rotary digging into, also can undertake casing or casing drilling, all equipped with underground continuous wall construction of underground continuous wall grab, double head cut pile wall construction, and of long spiral drilling methods (CFA), truly multi-usage.
2, equipment performance is advanced, high degree of automation, low labor intensity.
For crawler hydraulic self-propelled rig, rotating drill adopts full hydraulic pressure system, some are equipped with advanced computer operation system. In order to ensure that the excellent properties of rotating drill, most of the rotating drill manufacturers around the world to buy parts, such as the United States than carter le (CAT) chassis, the hydraulic system of Germany, Japan's electric appliance, etc., which can prolong the life of rotating drill as a whole, not as a parts damaged and influence their use. Rotating drill machine, electricity, liquid integration of highly concentrated, compact structure, convenient manipulation and high degree of mechanization, automation, mobile within the construction site, self-reliance mast, mobile, to hole location is convenient and fast. The telescopic rod, save time, manpower and joint pipe less auxiliary time, improve the utilization of time.
3, high drilling efficiency.
Screw drivers can configure different drill bits according to stratum situation, in the cohesive soil can use drill cylinder, speed up the drilling; For larger stratigraphic sandy pebble content can use short drill barrel, with 臵 slurry-supported, control drilling rate; In boulder, boulder and hard rock strata can be used in long and short screw drill bits for processing, loose change drill tube to continue again after drilling. Compared with conventional drilling rig, the rotating drill rotary torque, and can be adjusted automatically according to stratum situation. Drilling pressure is big, and easy to control. At the same time due to rotating drilling bit extracted directly from the hole digging rock and soil, therefore its penetration rate is very high. In general, the soil and sand layer drilling speed can be up to 10 m/h, in the clay layer can be up to 4-6 m/h, 3 to 5 times that of ordinary rotary drilling, even higher L23.
4, good quality.
Of stratum disturbance is small, small screw drivers drilling mud thin skin, and protecting the formation of hole wall is rough type L23, is beneficial to increase the pile side friction, guarantee the bearing capacity of pile foundation design. Sediment at the bottom of the bore, less easy to hole cleaning, and improve the bearing capacity of pile end.
5, little environmental pollution.
Rotating drill for dry or no circulating mud drilling, used only for the positive and negative circulation drilling mud. Therefore, the construction site neat, small pollution to the environment. At the same time rotating drill small vibration, low noise.
