DAM/Specific/TBT-DAM-003

Gabion and Reno Mattress Installation

Dams, Reservoirs & Flood Defence › Specific › Gabion and Reno Mattress Installation

Presenter		Project
Location		Date

Gabions are wire mesh baskets filled with stone used for retaining walls, river bank protection, and erosion control.
Reno mattresses are shallow, flat gabions laid on slopes and river beds to protect against scour and water erosion.
Wire mesh cages have sharp edges and protruding wire ends that cause lacerations during handling and assembly.
Manual handling of stone fill is physically demanding — mechanical filling using excavators with grabs reduces the strain.
Working near water during bank protection and channel lining creates drowning risk requiring PFDs and rescue equipment.
Gabion walls rely on correct filling, compaction, and tying for structural stability — poor construction causes wall collapse.
Lacing wire connections between gabion units must be made at the specified intervals to maintain structural integrity.
Ecological and environmental constraints often apply to gabion work near watercourses, particularly during fish spawning seasons.
Stone fill must meet the specification for size, grading, and durability — incorrect stone causes settlement and bulging.
Working on slopes during Reno mattress installation requires fall prevention measures and secure footing for all workers.

Wire lacerations	Gabion mesh and lacing wire have sharp edges and protruding ends that cut hands and arms — gloves are essential throughout.
Water proximity	Gabion installation takes place at the water's edge — PFDs and rescue equipment prevent drowning if a worker falls in.
Structural reliance	A gabion wall that is poorly filled, compacted, or tied will bulge, deform, or collapse under earth and water pressure.

Don't

Wear cut-resistant gloves and long sleeves when handling gabion mesh and lacing wire.
Use mechanical filling with excavator grabs to reduce manual stone handling.
Wear PFDs when working within two metres of open water during installation.
Ensure rescue equipment is available at all waterside gabion work locations.
Lace and tie gabion units at the specified intervals for structural integrity.
Fill gabions evenly and compact stone to prevent settlement and face bulging.
Use stone fill that meets the specification for size, grading, and durability.
Follow ecological restrictions for work near watercourses during sensitive seasons.
Install fall prevention measures when working on slopes for Reno mattress placement.
Brief the team on wire handling, water safety, and filling procedures daily.

DON'T handle gabion mesh or lacing wire without cut-resistant gloves and sleeves.
DON'T fill gabions by hand when mechanical methods are available to reduce strain.
DON'T work near water without wearing a PFD and having rescue equipment accessible.
DON'T allow workers near water without throw bags and lifebuoys at the location.
DON'T skip lacing wire connections — they hold the gabion wall together structurally.
DON'T overfill or underfill gabions — both cause deformation and structural weakness.
DON'T use undersized, rounded, or weak stone that does not meet the fill specification.
DON'T work near watercourses during restricted ecological periods without authorisation.
DON'T work on slopes without secure footing and fall prevention measures in place.
DON'T assume gabion work is low risk — wire cuts, water, and manual handling are constant.

See also: Flood Defence Construction Safety | Working Over Water

Generate professional Risk Assessment and Method Statements in minutes. 10 document formats, site-specific content, instant Word download.

Toolbox Talk Record