Views: 0 Author: WU Publish Time: 2024-12-03 Origin: Site
Rotary drilling rigs are widely used in foundation engineering due to their efficiency and flexibility. However, drilling through hard rock significantly increases the difficulty of construction, demanding better equipment performance and advanced operational techniques. To enhance drilling efficiency and protect equipment, here are some techniques and instructions for tackling hard rock:
Selecting the appropriate drilling tools is crucial for hard rock operations. Recommended tools include:
Core Barrel: Ideal for hard and intact rock formations, effectively breaking and extracting rock cores.
Rock Auger: Performs well on medium-hard rocks, capable of quickly breaking up rock fragments.
Impact Drill: For extremely hard rock formations, impact drills provide additional power to penetrate.
Using high-strength, wear-resistant alloy tools can improve drilling efficiency and extend the equipment's service life.
Adjusting the drilling rig's operational parameters based on rock hardness is essential:
Rotation Speed: Lower rotation speed for hard rock drilling to increase bit grip and reduce wear.
Drilling Pressure: Apply appropriate drilling pressure to avoid overloading the tool or damaging the equipment.
Mud Flow: Increase mud flow to cool the drill bit and remove debris, preventing overheating or clogging.
Segmental drilling is recommended for hard rock layers:
Start with a shallow hole to evaluate rock properties.
Adjust drilling strategy based on the assessment and proceed in segments to deepen the borehole.
Clean the borehole regularly to remove debris and avoid blockages or stuck tools.
Hard rock operations exert significant wear on equipment, requiring enhanced maintenance:
Regularly inspect drill bits and main components, replacing worn parts promptly.
Use sensors to monitor drilling pressure, rotation speed, and vibration, halting operations for inspection if anomalies occur.
Ensure the hydraulic and transmission systems function properly to prevent failures during high-intensity operations.
Safety is paramount during hard rock drilling:
Conduct a thorough geological survey before operations to ensure a well-planned approach.
Follow operational protocols strictly to avoid overloading or misoperation.
Perform periodic comprehensive inspections to maintain the equipment in optimal condition.
The key to drilling hard rock with rotary drilling rigs lies in selecting appropriate tools, optimizing operational parameters, employing segmental drilling, and reinforcing equipment maintenance. By adopting scientific methods and professional practices, drilling efficiency can be significantly improved, ensuring project quality and construction safety.
