11-28 16:12:20 With the development of China's industrialization and urbanization, pile foundation construction will continue to develop rapidly, infrastructure construction will flourish, and there will be more and more tall, large, and heavy construction projects. In the pile foundation industry, based on the bearing capacity requirements of high-rise, super high-rise buildings and large bridges, as well as environmental protection (smoke pollution, noise), vibration, construction quality and work efficiency. Rotary drilling rig is a kind of filling engineering machinery. Rotary drilling rigs are widely used in hole-forming operations in building foundation engineering due to their fast construction speed, high hole quality, low environmental pollution, flexible and convenient operation, high safety performance, and strong applicability, and are the first choice. Construction equipment for bored piles. There are currently about 38,000 rotary drilling rigs in China, and the market growth will exceed 4,000 in 2018. 1. The application fields of rotary excavator electric drill
pipes. With the improvement of concrete quality, the improvement of pile foundation construction technology, the improvement of the bearing capacity of cast-in-place piles and the strict implementation of urban environmental laws and regulations, cast-in-situ bored piles have almost replaced other foundation. Become the most widely used foundation. In the process of constructing large-diameter cast-in-place concrete piles abroad, rotary drilling rigs RIGS account for more than 70%, while reverse circulation rigs RIGS are almost no longer used in the European market. In household piling machinery products, the output of gyroscopes accounts for nearly 50% (Yunnan accounts for 70%). Ordinary rotary drilling auger is suitable for clay, silt, sand, silt, artificial backfilling, including some pebbles, gravel formations, with high torque power head rotary drilling, which can be adapted to the construction of breeze rock. It is currently the largest rotary drill in China. Within 600 hours of the drilling rig, the maximum hole diameter is 4.5 meters and the maximum drilling depth is 158 meters. Through the research of product adaptability, development, design and construction technology, rotary drilling rigs have reliable and mature construction methods in soft soil, hard rock, dense gravel, isolated rock and other complex formations. Due to the large demand for roads, bridges, railways, water conservancy, urban construction and other projects, there is a huge market and development space for rotary drilling rigs RIGS. 2. Rotary drill pipe construction case The above is a case of water construction or bridge pile construction of the rotary drill rig, which has won the unanimous approval of the project department with its safe and efficient performance. Rotary excavation construction is a safe, efficient, green and environmentally friendly construction technology. Compared with successful methods such as rotary drill, percussion electric drill, and manual excavation, it has the characteristics of high pile speed, high quality, safety and convenience, energy saving and environmental protection. And many other advantages. 3. Construction scope Rotary digging can be carried out in almost all formations, including silt, silt, clay, sand, pebbles, gravel, mudstone, sandstone, limestone and hard volcanic rock. It can effectively drill into rock with strength less than 180MPa or bearing capacity less than 3000KPa. 4. Working principle The working device of the rotary drilling rig: the diesel engine provides power for the hydraulic device. The working device includes a drill rod and a drill bit, which transmit downward pressure and positive and negative torque. The power of the working device is provided by the power head motor and the pressurizing coil motor. For example, CRRC TR360F drilling rig can provide 36 tons of torque and 43 tons of downward pressure, which can effectively destroy rocks and drill bits. When working, the main coil lifts and releases the drill rod, and the power head presses down or rotates to transmit pressure and torque to the drill bit through the drill rod. The drill bit cuts the ground to achieve drilling. Compared with gyroscopes and percussion drills, RIGS rotary drills are 15 to 20 times more efficient. 5. Comparative advantage Efficiency advantage: Due to the essential difference in rock penetration and drilling mechanisms between rotary drills and percussive drills, they have great advantages in rock penetration capabilities and speed. At many sites, percussion drilling requires several months of pile holes, while rotary drilling only takes a few days. Environmental protection advantages: The percussion drill uses circulating mud, which consumes a large amount of mud, and the mud treatment cost is high; the rotary drilling drill is a static mud retaining wall, which consumes a small amount of mud. In terms of environmental protection, rotary digging has great advantages. Management advantages: The use of rotary percussion rigs requires a large number of machines and operators, mud pool distribution and auxiliary equipment layout is chaotic, site management is difficult, but the rotary excavation construction efficiency is high, the number of equipment is small, and it is easy to manage and arrange. To sum up, the rotary drilling bit is a new type of construction technology, which has been widely recognized in major national projects. From the aspects of construction quality, construction efficiency, construction cost and geological adaptability, it has an unparalleled impact drill method. Advantages, and the machine provides special electric drill bits and drill pipes, high strength, high wear resistance, and coal safety certification.
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