Selection of Models And Accessories for Second-hand Rotary Drilling RIGS in Foundation Construction of High-rise Buildings

The foundation of high-rise buildings needs to bear huge vertical loads, and has extremely high requirements for the depth, diameter and quality of the drilled holes. The model matching degree and accessory compatibility of second-hand rotary drilling RIGS directly determine the efficiency and safety of foundation construction. The following six core dimensions are used to popularize the key points of selection and accessory matching.

1. Select the drilling rig model based on the foundation depth: According to the design depth of the high-rise building foundation (usually 20-50 meters), give priority to choosing the model with the maximum drilling depth exceeding the design value by 10%. For example, for a 30-meter deep foundation, a 40-meter drilling rig can be selected to avoid the inability to complete the operation due to insufficient depth.

2. Determine the power of the drilling rig based on geological conditions: If the foundation construction area is composed of hard rock layers, a high-power drilling rig (above 220kW) should be selected to enhance the rock-breaking capacity. For soft soil layers, 160-200kW models can be selected to balance efficiency and energy consumption.

3. Select the model structure based on the stability of the machine body: High-rise buildings are mostly located in urban areas. Crawler models are preferred as they have a large ground contact area, strong stability, and can adapt to narrow construction sites, reducing the impact of machine body tilt on the accuracy of hole formation.

4. Prefer multi-section telescopic drill pipes: In response to the deep foundation requirements of high-rise buildings, 4-6 section telescopic drill pipes should be selected to reduce the number of splicing times and improve drilling efficiency. At the same time, check the wear-resistant coating of the drill pipe to ensure reduced wear during deep hole operations.

5. Drill bit type is suitable for foundation requirements: If the foundation requires large-diameter piles (such as 1.5-2 meters), a cylindrical drill bit is selected to ensure precise hole diameter. When encountering strata containing pebbles, switch to toothed drill bits to enhance the ability to break hard impurities.

6. Accessories emphasize durability and versatility: Select high-strength wear-resistant drill teeth, high-pressure resistant hydraulic hoses and other accessories to extend service life; Give priority to choosing general-purpose parts with a large market share to facilitate subsequent maintenance and replacement and avoid delaying the project schedule.

In conclusion, for the foundation construction of high-rise buildings, second-hand rotary drilling RIGS should be selected. The model needs to match the depth, geological conditions and site conditions, and the accessories should take into account compatibility, durability and universality. Only by precisely controlling these two core aspects can the quality of foundation construction be guaranteed, a solid foundation be laid for the structural safety of high-rise buildings, and at the same time, construction costs and risks be reduced.