How Can The Vertical Accuracy of Pile Driving Be Improved During The Construction Process with A Rotary Drilling Rig

The vertical accuracy of rotary drilling RIGS in pile driving directly affects the quality of pile foundation engineering. Excessive deviation can lead to insufficient bearing capacity or structural hazards. The following six key links from construction preparation to process control introduce practical methods for improving vertical accuracy:

1. Equipment installation and commissioning: During installation, use a level to calibrate the drilling rig chassis to ensure that the machine body is stable and does not tilt. Adjust the coaxiality of the connection between the power head and the drill pipe to avoid eccentric rotation causing offset torque.

2. Site leveling treatment: Before construction, remove debris from the ground and compact it. Harden the soft soil foundation to prevent the drilling rig from settling or shaking during drilling, which may affect verticality.

3. Hole opening positioning calibration: Before opening the hole, precisely position the pile position with a total station, slowly lower the drill bucket to the surface, and adjust the vertical Angle of the drill pipe through the verticality monitor of the drilling rig. The deviation should be controlled within 0.5%.

4. Drilling process monitoring: During drilling, monitor the verticality instrument data in real time. Pause the operation every 2 to 3 meters of progress. Use a line hammer or laser line projection instrument to recheck the verticality of the drill pipe. If any deviation is found, adjust the drilling pressure and rotational speed in a timely manner.

5. Special stratum response: When encountering strata with uneven hardness, reduce the drilling speed and adopt a light pressure and slow rotation method to avoid uneven force on the drill bucket, which may cause the drill pipe to deviate. The stability of the hole wall is adjusted by backfilling clay.

6. Re-inspection and correction after hole formation: After the hole is formed, the verticality of the hole wall is rechecked with a steel cage hole detector or an ultrasonic detector. For the parts that exceed the tolerance, the hole sweeping process is adopted for correction to ensure that the verticality accuracy of the pile body meets the design requirements.

Conclusion: Improving the vertical accuracy of pile driving with rotary drilling RIGS should be carried out throughout the entire construction process, from equipment calibration, site treatment to dynamic monitoring and response to special working conditions, all of which are closely linked. Through precise operation and real-time monitoring, the verticality of the pile body can be effectively controlled, ensuring the safety and reliability of the pile foundation project.