Gabions are modular building blocks formed of wire mesh and filled on site with rock, stone or crushed concrete. They are filled on the premises, often with locally available material and are an effective and relatively inexpensive capital cost. Because they are flexible and porous they can absorb some wave and wind energy, consequently reducing the erosion problems associated with impermeable sea defences such as concrete seawalls. Gabions can be placed as sloping “mattresses” or as near vertical cubic baskets. The latter are intended for bank or cliff stabilisation and are not normally suitable for use in shoreline situations.
Steel-welded gabion baskets are very robust wire mesh rock-filled baskets primarily used as retaining walls. Their characteristic rigidity makes these baskets particularly suitable for high and freestanding structures. They are used in many situations including stabilization of earth movement and erosion, river control, water basin, canal refurbishment, landscaping and retaining walls. They can be manufactured in welded mesh or woven wire. Welded mesh gabions are faster and do not need tensioning. This allows them to keep thair shape, to be free from bulgies and depressions and fit easily against the wall. It is possible to cut holes in them if needed to pass pipes or whatever through and they can be machine filled.
The mesh is a welded wire square mesh of 76.2 mm x 76.2 mm or 50.8 mm x 50.8 mm and is available in Hot Dip Galvanised, PVC-Zinc Coated or Triple Life corrosion protection (95% zinc 5% Aluminium). Plastic coated units are most suitable for coastal projects or in fresh/see water environments.