Proprietary shoring systems such as drag boxes, slide rail, and modular shoring provide rapid excavation support without the need for traditional timber or steel shoring. These systems are engineered for specific soil conditions and excavation depths. Using them outside their design parameters or without proper installation has caused trench collapses and fatalities. This talk covers the safe use of proprietary shoring on UK construction sites.
Key Hazards
Trench collapse from shoring installed in soil conditions beyond its design rating
Crush injuries during installation or removal of heavy shoring panels
Ground movement from shoring not seated properly against the trench face
Workers trapped between the shoring unit and the excavator during placement
Control Measures
Select the shoring system based on the geotechnical assessment and the excavation depth.
Follow the manufacturer's installation instructions and maximum depth ratings without exception.
Use the excavator to position shoring panels; never allow operatives in the trench during placement.
Ensure shoring panels are seated firmly against the trench face with no voids behind them.
Inspect the shoring installation before every shift and after any ground disturbance or heavy rain.
Do not exceed the maximum trench width specified for the shoring system in use.
Brief the excavator operator and ground crew on the installation sequence before starting.
Maintain a safe distance from the shoring during panel extraction when the system is being removed.
Record all shoring installations on the temporary works register with system type and rated depth.
Remember
Select the shoring system based on the geotechnical report and never exceed the rated depth
Follow the manufacturer's installation instructions and maximum depth ratings exactly
No one may enter the trench while shoring panels are being installed or removed
Inspect the shoring before every shift and after heavy rain or ground disturbance
Record all shoring installations on the temporary works register with the system rating
Applicable Legislation: CDM 2015 · BS 6031:2009 (Code of Practice for Earthworks) · BS 5975:2019 (Temporary Works) · MHSWR 1999