What are the applications of rotary drilling rig?

With the improvement of concrete quality, the perfection of pile foundation construction technology, the improvement of bearing capacity of cast-in-place pile and the strict implementation of urban environmental protection laws and regulations, bored pile has almost replaced other foundations and become the most widely used foundation.

In the construction of large-diameter concrete cast-in-place piles abroad, rotary drilling rigs account for more than 70%, and reverse circulation drilling rigs are almost no longer used in European markets. In domestic piling machinery products, rotary drilling rigs account for nearly 50% (Yunnan rotary drilling rigs account for 70%).

Rotary drilling rig is generally suitable for clay, silt, sandy soil and muddy soil, and the stratum containing some pebbles and gravels is backfilled manually. The rotary drilling rig with high torque power head can adapt to the construction of weathered rock stratum. At present, the largest rotary drilling rig in China is CRRC 600H, with a maximum drilling diameter of 4.5m and a maximum drilling depth of 158m.

With the adaptive research and development of products and the research of construction technology, rotary drilling rig has a reliable and mature construction method in complex strata such as soft soil layer, hard rock layer, dense gravel and boulder. Due to a large number of engineering requirements such as highway bridges, railways, water conservancy and urban construction in China, there is a huge market and development space for rotary drilling rigs.

Extended data

The main function of rotary drilling rig is to form holes and grooves on the surface. The working object is shallow geology, mainly sandy soil, and pebble layer and even bedrock will be encountered at the same time. Because of the ever-changing stratum conditions, shallow geology is greatly influenced by human activities, and its regularity is more difficult to grasp than deep geology, so the working object of rotary drilling rig is particularly complicated. .

Common rotary drill bits include spiral drill bit, drill bucket, barrel coring bit, under-reamed drill bit, impact drill bit, impact drill bit and hydraulic grab.

Baidu encyclopedia-rotary drilling rig