In soft ground improvement projects, high-pressure jet grouting pile drilling is a critical process to ensure pile foundation quality. However, during actual construction, high-pressure jet grouting pile drilling often faces challenges such as difficult casing penetration and deviation, requiring targeted measures to ensure construction accuracy.

1. Main Causes of Deviation in High-Pressure Jet Grouting Pile Drilling

The quality of high-pressure jet grouting pile drilling is affected by multiple factors:

1. Unleveled ground leading to unstable drilling rig installation (accounts for 65% of incidents)

2. Underground obstacles hindering drill pipe penetration (e.g., construction debris, cable trenches)

3. Drill pipe verticality exceeding the 1.5% technical standard

4. These factors significantly reduce the pass rate of high-pressure jet grouting pile drilling

2. Key Preventive Measures

Effective methods to improve high-pressure jet grouting pile drilling accuracy:

1. Pre-construction survey: Conduct probe drilling to detect obstacles within 3 meters underground

2. Ground treatment: Lay steel plates or concrete pads to ensure rig leveling

3. Real-time monitoring: Check drill pipe verticality every 2 meters (control within 0.3%)

4. Process optimization: Use side-nozzle spray heads to reduce grout leakage

3. Solutions for Deviation Incidents

When deviation occurs during high-pressure jet grouting pile drilling:

1. Immediately stop drilling and backfill the hole

2. Recalibrate rig leveling

3. Adjust injection pressure (recommended 20-30MPa)

4. Reject piles with deviation exceeding 2%