Explanation of the use and classification of rotary drilling rigs
Rotary drilling rigs (also called multifunctional fully hydraulic rotary drilling rigs) are a common drilling machine for cast-in-place piles. After experiencing unstable product performance, single functions, and inability to adapt to complex geological environments, they began to develop in the direction of multifunctionality, large and small rotary drilling rigs. At present, one of the most common multifunctional constructions of foreign drilling rigs is CFA construction. With the further development of pile-forming technology, rotary drilling rigs will be vigorously developed in terms of product diversification, multifunctionality, and different models developed for different regions. In recent years, the application of rotary drilling rigs has become more and more extensive, and the market prospects are very promising. There are still many users in remote areas who have such questions: "What is a rotary drilling rig?" The following editor will explain the use and classification of rotary drilling rigs for everyone.
Uses of rotary drilling rigs:
Rotary drilling rigs are mainly used for the construction of foundation bored cast-in-place piles for large-scale key projects such as various highways, railways, docks, bridges, municipal engineering and high-rise buildings. They can drill into sand, clay, medium-weathered rock and pebble layers, which are suitable for soil geological conditions in most parts of my country.
Rotary drilling rigs can drill bored piles: Rotary drilling rigs are commonly used drilling equipment for vertical piles and inclined piles. They are generally used for bored piles with a diameter greater than 500mm. In addition, they can also be equipped with long spiral drilling tools, full casing and impact grabs, hydraulic grabs, reverse circulation drilling tools, high-pressure rotary spraying tools, etc., for the construction of bored piles such as spiral bored piles, bored piles with expanded bottom, submersible bored piles, reverse circulation bored piles, Benoit bored piles, and vibration impact sinking piles.
Rotary drilling rigs can drill underground continuous wall piles: Rotary drilling rigs can also be equipped with hydraulic grabs or mechanical grabs for the construction of underground continuous walls in foundation support projects. At the same time, in the field of foundation resistance construction such as civil engineering, through the combination of rotary drilling with close arrangement and supplemented by the application of rotary spraying grouting, continuous wall second grab groove construction and other construction methods, a wider range of water-stop support bearing pile walls can be formed.
Rotary drilling rigs can drill interlocking piles: With the continuous increase of high-rise buildings and underground projects, rotary drilling rigs are equipped with short spiral drill bits, vibrating hammers and other tools, which can be used for the construction of interlocking piles for foundation support.
Classification of rotary drilling rigs:
Rotary drilling rigs at home and abroad can be classified according to the following aspects:
According to the chassis structure of rotary drilling rigs, they can be divided into rotary drilling rigs with wheeled, crawler and walking chassis. Among them, crawler chassis are divided into two forms: special chassis structure and general chassis structure with excavator or crawler crane.
According to the structure of the power head suspension device, they can be divided into drill mast type and boom type rotary drilling rigs.
According to the form of drill rod, rotary drilling rigs can be divided into square rod, machine lock drill rod, friction drill rod and composite drill rod.
According to different power sources, they can be divided into electric drive and internal combustion drive rotary drilling rigs.
According to the structural form of the working device, they can be divided into two types: drill mast plus double triangular parallelogram connecting rod amplitude change mechanism and drill mast with enlarged tripod support. The advantages and disadvantages of these two structures are just opposite, as shown below:
Advantages of the former: flexible adjustment of the working device; convenient retraction and deployment of the drill mast, easy to achieve self-loading and self-unloading; Disadvantages of the former: relatively poor adjustment stability of the drill mast. At present, the mainstream at home and abroad is the drill mast plus double triangular parallelogram connecting rod luffing mechanism, accounting for more than 90%.
