Gabion Mattresses

Triple Twisted Hexagonal Mesh Gabion Mattresses are mostly used in projects of Flood Embankment and intake works. Gabions types are boxes and mattresses. Aerct supplies quality gabions system for flood protection, with detailed requirements for the gabion wire, mesh fabric, filter fabric, stones and construction of gabions work as following.

Technical Requirements of Gabion Mattresses:

Wire Fabric for Gabions

All wire used in the fabrication of gabions (including selvage wire and lacing wire) and in the wiring operating during construction (including tie wire) shall be annealed mild steel wire, having an average strength of 38-50 kg/mm2.

The adhesion of the zinc coating to the wire should be such that, when the wire is wrapped six turns round a mandrel of 4 times the diameter of the wire, it does not flake or crack to such an extent that any flakes of zinc can be removed by rubbing with the bare fingers.

Wire mesh fabric shall be hexagonal triple twist mesh. The tightness of the twisted joints shall be such that a force of not less than 1.7kN is required to pull on one wire to separate it from the other wire provided that each wire is prevented from turning and the whole process is done in one plane. Ultimate failure load in the direction of the weave will be about 43 kN/metre length. Longitudinal elongation of mesh will not exceed 10%.

The gabion mesh shall be cut, folded and wired together to form joints, angles, curves or slopes which are not possible to obtain in the structures with the standard rectangular gabions, the mesh must be cleanly cut, and the surplus mesh cut completely out, or folded back or on to, and neatly wired to an adjacent gabion face. The cut edges of the mesh shall be securely laced together with binding wire.

Gabions and mattresses should be laid on a filter fabric.

The filter fabric shall be of a non-woven melted fabric consisting of a mixture of polypropylene and polythene or other similar materials. The fabric shall be resistant to ultra violet rays and sunlight.

Where overlapping of fabric is required, the overlap shall not be less than 500 mm and shall be sewn with a lock type stitch in such a manner that it produce a joint as durable as the fabric.

The grade of fabric shall weigh not less than 350 gr/m2 and have a thickness of 0.5 mm.

Tensile strength shall be not less than 2kN/m. Permeability (ViH50) shall be not less than 60l/s*m2.

Storage and handling of the fabric in no case shall be the geotextile be exposed to direct sunlight, ultra violet rays, temperature greater than 60o C, mud, dirt, dust and debris, to the extent that its strength, toughness or permeability characteristics are diminished