Views: 0 Author: Site Editor Publish Time: 2026-02-04 Origin: Site
Large rotary drilling rigs of models 360, 400, and 450 are the main equipment for infrastructure engineering. The key to model selection lies in matching construction requirements, geological conditions, and efficiency goals. Different models have their own focuses in terms of torque, drilling depth, and stability. Precise selection can significantly improve construction efficiency and reduce costs.
The torque of the 360 model is usually around 360kN・m, with a maximum drilling depth of approximately 80-100 meters and a hole diameter of 1.5-2.5 meters, which is suitable for most conventional infrastructure scenarios. Its advantages lie in its flexible body, convenient transition, balance of efficiency and cost, making it suitable for projects such as building pile foundations, municipal pipe networks, and small and medium-sized bridge foundations. It performs stably especially in medium geological conditions such as clay, sandy soil, and pebbles. With low fuel consumption and controllable maintenance costs, it is the preferred choice for short-term projects and projects with limited budgets. At the same time, it can handle slightly weathered rock formations and meet the hole-forming needs of most civil and small-scale infrastructure projects.
The 400 model has a torque of 400kN・m class, a maximum drilling depth of 100-120 meters, and a hole diameter of 2.0-3.0 meters. Its performance is between that of the 360 and 450 models, with broader adaptability. Its core advantages are sufficient torque and high drilling efficiency, enabling it to handle complex geological conditions such as dense pebble layers, moderately weathered rocks, and strongly weathered rocks. It is widely used in medium and large-scale projects such as high-speed railway bridges, highway pile foundations, large building group piles, and water conservancy anti-seepage walls. The machine body has strong stability and high construction precision. It can not only meet the efficient construction of conventional strata but also undertake medium-difficulty geological projects. It is the most widely used main model in infrastructure projects, balancing versatility and professionalism.
The 450 model has a torque exceeding 450kN・m, a maximum drilling depth of 120-150 meters, and a hole-forming diameter of 2.5-3.5 meters. It is specially designed for high-difficulty and large-volume engineering projects. Its advantages lie in strong power and high impact resistance, enabling efficient drilling in extreme geological conditions such as hard rock, slightly weathered rock, and boulders. It is suitable for large-scale projects such as main pier piles of large bridges, wind power foundation piles, deep piles of super high-rise buildings, and deep-water piles of ports and wharves. Its chassis is heavy and the mast has high rigidity, which makes it less prone to hole deviation during deep hole construction, ensuring high hole-forming quality. Although the equipment cost and fuel consumption are relatively high, its efficiency in hard rock construction and deep hole operations is much higher than that of small models, which can effectively shorten the construction period. It is a core equipment for large-scale infrastructure and special geological engineering.
Choose by geology: For soft and medium geology, priority is given to models 360 or 400; for hard rock and deep holes, model 450 must be selected.
Choose by project quantity: For small-scale short-term projects, choose 360; for medium and large-scale long-term projects, choose 400; for large-scale high-difficulty projects, choose 450.
Choose by balancing cost and efficiency: For conventional projects pursuing cost performance, choose 360; for complex projects pursuing efficiency, choose 400 or 450. Avoid "using a large machine for a small job" or "using a small machine for a large job".
Accurately matching the model with the construction scenario can not only ensure construction quality and efficiency, but also control equipment investment and operating costs, so as to maximize project benefits.
