From crawler travel to undercarriage extension, from power head rotation to main winch lifting — every operation of a rotary boring machine combines the precise coordination of hydraulic transmission and intelligent control. As an indispensable piling equipment in infrastructure construction, it drills perfect pile holes deep underground through its unique method of “rotary cutting + pressure drilling”.【WhatsApp/WeChat/Phone】+86 13837122632
Rotary Boring Machine vs. Traditional Impact Drills
Compared with traditional impact drills, modern rotary boring machines have obvious technical advantages:
Construction efficiency: The rotary boring machine uses dual modes: “high speed & low torque” and “low speed & high torque”. It directly excavates soil and rock by rotary digging without repeated impact crushing. Its hole-forming speed is 5–10 times that of impact drills, greatly shortening the construction period.
Hole-forming accuracy: Impact drills rely on gravity impact, so hole positions easily deviate. The rotary drilling rig machine is equipped with an automatic verticality detection and adjustment system, achieving millimeter-level precision control.
Improved safety: Impact drills often require manual digging or auxiliary blasting, posing high safety risks. The rotary drilling rig machine realizes fully mechanized operation; operators can complete all processes in the cab, greatly reducing construction risks.
Environmental impact: Impact drills produce high noise and strong vibration, significantly affecting nearby buildings and residents. The rotary drilling rig machine works quietly with little stratum disturbance, making it especially suitable for construction in sensitive urban areas.
Using a hydraulic rotary piling rig for pile foundation construction brings multiple benefits to engineering projects:
Wide stratum adaptability
It easily handles various geological conditions — from soft soil, sand layers to cobble layers and hard rock — by replacing drill bits and adjusting drilling parameters.
Higher single-pile bearing capacity
Rotary-drilled holes have rough walls, low disturbance and a thin mud layer, so concrete bonds tightly with the stratum. The bearing capacity is over 20% higher than that of impact piles with the same pile diameter.
Flexible adjustment of pile diameter and depth
Different pile diameters can be achieved simply by changing the drill bit. Telescopic drill rods allow quick adjustment of drilling depth to easily handle design changes.
High degree of mechanization
Traveling, positioning, drilling and soil removal are all hydraulically driven, greatly reducing labor intensity.
Convenient reinforcement cage and concrete supply
Reinforcement cages can be processed on-site or centrally delivered. Operation organization is flexible without occupying too much space.
Relationship Between Torque and Construction Efficiency of Rotary Boring Machines
Torque is the core indicator of the construction capacity of a hydraulic rotary drilling rig and is closely related to efficiency:
Torque determines drilling capacity
The maximum output torque of the YG-30 reaches 100 kN·m, which directly defines the hardness of rock the rig can break. Higher torque means harder rock and larger applicable pile diameters.
Dual-mode intelligent switching
Modern hydraulic rotary drilling rigs use “high speed & low torque” for fast drilling in soft soil, and automatically switch to “low speed & high torque” in hard rock to break rock with strong cutting force, balancing efficiency and capacity.
Power head is the key component
As the core working device of a rotary drilling rig machine, the power head converts hydraulic energy into mechanical rotational energy. The transmission efficiency of its reducer directly affects actual torque output. High-quality power heads ensure low torque loss and stable transmission.
Winch pressure for coordinated operation
Rotation alone is not enough for fast drilling; a winch pressure system provides downward thrust. The maximum thrust of the YG-30 pressure cylinder is 110 kN. Together with power head torque, it forms a combined “rotation + pressure” rock-breaking force, greatly improving pure drilling efficiency.
How Does a Rotary Drilling Rig Machine Handle Complex Strata?
It uses multiple strategies for complex and variable geological conditions:
Cobble/boulder layers: Use a conical spiral drill bit or barrel drill with pick teeth, together with the “low speed & high torque” mode to crush or directly remove cobbles. The winch pressure system of the hydraulic rotary drilling rig provides stable downward pressure to prevent bit bouncing.
Hard rock layers: Replace with a high-strength pick bit and use maximum power head torque (e.g., 100 kN·m for YG-30) for annular cutting and crushing. Drilling speed should be reduced to ensure full fragmentation.
Soft soil/quicksand layers: Adopt “high speed & low torque” for fast drilling, with a casing driving device to press casing while drilling and prevent hole collapse. With a casing oscillator, accurate casing swinging and installation can be realized.
Karst / fractured strata: Use a sand bucket or double-bottom drill to pass slowly through karst areas. The main winch’s bottom-touch protection detects changes at the hole bottom to prevent accidents caused by sudden bit drop.
Daily Maintenance Checklist for Hydraulic Rotary Drilling Rigs
To ensure long-term stable operation of a rotary boring machine, the following daily maintenance items are essential:
Engine system: Check oil level, coolant level and air filter clogging daily. Use specified-grade oil for Cummins engines; change oil and filter every 250 hours.
Hydraulic system: Check hydraulic oil level and quality, and inspect for leaks in hydraulic lines. Oil contamination is the main cause of hydraulic failures. It is recommended to replace the return oil filter every 500 hours.
Drill rods and tools: Check drill rods daily for scratches, cracks and smooth extension. Replace worn drill teeth promptly to avoid damage and reduced efficiency.
Winch wire ropes: Check for broken wires, flattening or corrosion. Lubricate with grease according to standards. The YG-30 main winch rope diameter is 28 mm; its condition directly affects safety.
Traveling and slewing mechanisms: Check track tension and oil leaks in track rollers and carrier rollers. Lubricate large-diameter slewing bearings every 100 hours for stable rotation.
Electrical system: Check sensors and limit switches for sensitivity, and digital displays for accuracy. Ensure depth counting and verticality detection work normally.
Hydraulic Rotary Piling Rig Supplier — YG
YG is committed to providing customized construction solutions for customers worldwide. From the YG-30 to large-scale models, our hydraulic rotary drilling rigs cover various pile diameters and depth requirements, widely used in bridges, buildings, subways and other engineering fields.
Relying on a rich database of construction cases, YG’s engineering team can accurately recommend the most suitable model and provide full-process technical support — from stratum analysis to drilling parameter optimization.
Let professionals do professional work. Choose YG, and make your project go smoothly.【WhatsApp/WeChat/Phone】+86 13837122632
