GRW/Specialist/TBT-GRW-004

Soil Nailing Safety

Groundworks & Earthworks › Specialist › Soil Nailing Safety

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Soil nailing is a ground reinforcement technique using steel bars drilled and grouted into slopes or excavation faces for stability.
Drilling rigs used for soil nailing operate on steep slopes and near excavation faces, creating overturn and falling hazards.
High-pressure grout injection poses burst-hose and splash risks — operators must wear face shields and waterproof clothing.
Nail head plates and facing construction involve working close to the excavation face where localised collapse can occur.
Compressed air systems powering the drill rig require maintained hoses, correct connections, and hearing protection.
Soil nail installation produces significant noise and vibration affecting workers and potentially damaging adjacent structures.
Pull-out testing of installed nails uses hydraulic jacks under high pressure, requiring exclusion zones during the test.
The excavation sequence must match the nailing programme — excavating ahead of nail installation removes slope support.
Ground conditions can vary significantly along a nailed face — unexpected soft zones or water create additional instability.
Only trained, competent operatives may operate soil nailing drill rigs and carry out grout injection procedures.

Slope instability	Soil nailing stabilises slopes during excavation — digging ahead of the nailing programme removes the support the nails provide.
High-pressure grout	Grout injection under pressure creates burst-hose and splash risks — face and eye protection prevent serious injury.
Rig overturn	Drill rigs operating on steep slopes are vulnerable to overturn — positioning and ground conditions must be assessed for every location.

Don't

Ensure the drill rig is stable and level before starting each nail installation.
Follow the excavation sequence to match the nailing programme without digging ahead.
Wear face shields and waterproof clothing during grout injection operations.
Maintain exclusion zones during pull-out testing with hydraulic jacks.
Use hearing protection near the drill rig and compressed air equipment.
Monitor adjacent structures for vibration damage during nailing operations.
Check compressed air hoses and connections before starting the rig each shift.
Report unexpected ground conditions including soft zones or water ingress immediately.
Brief the team on the nailing sequence and daily excavation limits each morning.
Hold valid competency certification before operating soil nailing equipment.

DON'T position the drill rig on steep or unstable ground without a stability assessment.
DON'T excavate below the level of the last installed nail row without authorisation.
DON'T carry out grout injection without face protection and waterproof clothing.
DON'T stand near hydraulic jacks during nail pull-out testing — stay outside the zone.
DON'T work near the drill rig without hearing protection for the full duration.
DON'T continue nailing if vibration monitoring shows damage risk to adjacent structures.
DON'T use worn or damaged compressed air hoses — they fail under pressure.
DON'T ignore unexpected soft ground or water — it changes the design assumptions.
DON'T excavate ahead of the nailing programme — the slope relies on installed nails.
DON'T operate soil nailing equipment without valid training and competency certification.

See also: Groundworks Safety Awareness | Ground Anchor Installation

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