Two factors of slow development of rotary drilling rig.India Excavator sprocket
The rotary drilling rig has the characteristics of large installed power, large output torque, large axial pressure, flexibility, high construction efficiency and multi-function. Because the rotary drilling rig is a low-noise, vibration free and environment-friendly drilling rig, the noise during drilling is within 65 dB, and it is in the original soil excavation state during the hole forming process. It is directly loaded and unloaded on the dump truck through the bucket lifting, so that no mud is discharged during the hole forming process. If the water content of the excavated original soil is too high or in the flow plastic state, if the on-site flow plastic soil water reduction and solidification treatment device is equipped, the excavated flow plastic soil will be turned into dry soil after water reduction and solidification treatment, and then transported by dump truck, which meets the requirements of urban environmental protection. Although there are so many advantages, the factors that restrict the rotary drilling rig at this stage should not be underestimated, mainly from two aspects:
On the one hand, the high price of equipment is the main factor restricting its development:
The diameter of bored pile is generally 1.2 ~ 1.5m. When purchasing equipment, enterprises generally need to consider the safety reserve coefficient, and the construction capacity of the purchased rotary drilling rig should be slightly larger. Therefore, the construction caliber of the most widely used rotary drilling rig is between 1.5 and 2 meters. The price of a rotary drilling rig is more than 4million yuan. If the construction caliber is larger, the price of a drilling rig plus accessories will be tens of millions of yuan. For general construction units, especially for the vast majority of geological teams engaged in pile foundation construction, the one-time investment of several million or even tens of millions of yuan to purchase equipment is difficult for enterprises with weak financial strength. Secondly, from the perspective of the current management system, even if the enterprises are able to purchase this advanced construction equipment, their leaders will consider many factors and will not purchase it easily.India Excavator sprocket
On the other hand, the high operating cost of rotary drilling rig is also a major factor restricting the purchase of construction enterprises:
According to the introduction of the drilling rig manufacturer and the actual use of the user, the full load normal working life of the rotary drilling rig is 6300 hours. After this life is exceeded, some parts need to be replaced and repaired, especially the winch system, the main pump of the hydraulic system, the power head and the drill pipe. These parts are very expensive and the replacement time is long after damage. This makes the operating cost of the rotary drilling rig greatly increase in actual use, and correspondingly increases the construction cost of the pile foundation. At present, due to the fierce competition in the pile foundation market and the non-standard competition, many pile foundation projects are subcontracted layer by layer before they reach the hands of construction enterprises. The project prices are relatively low and there is not much profit space. For example, the rotary drilling rig is used for construction. Although the construction efficiency is high and the project quality is good, the profit is very low or even loss. This is also the main reason why many construction enterprises do not buy rotary drilling rigs, or even deliberately leave them idle, but still use the traditional and relatively backward construction methods. The best one is the one that applies to the actual situation.India Excavator sprocket
Post time: Jun-01-2022
