Gabion mattresses are large plan area gabion units in depths generally of 0.15,0.225,0.3 and 0.5m.
Each unit as standard is sub divided into cells normally not exceeding 2m x 1m.
The purpose of a gabion mattress is to protect river beds,river embankments and coastal embankments against erosion. Other uses include reveting of steep slopes and outfall and inlet bed protection.
The depth of the mattress required is dependant upon its application and the conditions prevailing.
Mattresses can be manufactured in any of the welded wire mesh/wire diameter specifications that are available for gabions. However, the criteria for river or coastal protection works is predominately for flexibility of the unit, therefore the selection criteria is normally for the lighter mesh wires (i.e. 3.0mm PVC coated or 3.0mm Triple life coated dependant upon the environment).
For dry land steep slope reveting where a planar face is required, the heavier wire diameters or a combination of heavier and light wires are more suitable.
In all cases where the units are subject to immersion in saline water or where the quality of water is suspect, then PVC coated units should always be specified.
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DIAMOND WIRE NETTING & FINISHED PRODUCTS COMPANY
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