Gabions box Galvanized / PVC coated ,functions applications

The word gabion“ comes from an old italian word---gabbione, that means "big cage".  it is available in woven mesh type and welded type, made of galvanized wire or pvc wire,

PVC Welded gabion box

PVC woven gabion box

Around 7000 years ago, early gabion type structures protected the bank of river Nile. In middle ages, gabions were used as military forts. In earlier history, civil engineers have extensively used gabions for stabillization of banks, coasts, highways and erosion control of slopes. From the banks of river Nile, where they were created up to today, gabion walls are a benefit for the landscape. It is used for thosands of years as a gravity type retaining structure and makes a attractive, efficient and cheap wall system.

Hexagonal woven mesh gabions are manufactured from a mesh that has a hexagonal opening which is formed by twisting pairs of wire together with one and a half turns (sometimes referred to as triple or double twist).

This type of mesh production is continuous. To form panels, the mesh is guillotined across the weave and the cut ends of the wire are wrapped around a heavier wire to form a selvedge end.

his type of mesh is flexible as it can articulate about the twists. It is normally manufactured from a 2.7mm wire diameter for gabions or 2.0mm wire diameter for mattresses. Wire coatings are either galvanised or Galfan coated. For more aggressive environments, an additional organic polymer powder (PVC) coating should be applied to a Galfan coated base wire.

TECHNICAL SPECIFICATIONS

Fabric Type:

Hexagonal woven, double-twist wire mesh

Mesh Aperture:

80mm x x100mm

Wire Sizes Available:

Galfan/PVC – 2.7mm/3.7mm overall

Tensile Strength (wire): 

350 to 550 N/mm²

welded mesh gabions are manufactured from a square mesh, normally of opening size 75.0mm × 75.0mm where the longitudinal wires are welded to the cross wires at their intersection points.

This type of fabric manufacture produces a dimensionally stable mesh. The mesh is produced in standard sheets which are then cut into the required panel sizes (and partially factory-connected) to form the flat pack unit.

Welded mesh gabions can be readily modified on site by cutting the mesh back to the next transverse mesh wire. Welded mesh gabions are available in a number of wire diameters to suit the application or can be manufactured in a combination of mesh-wire specifications to provide economy in supply. The resultant gabions’ flexibility is dependant upon the choice of wire diameter.

Where two types of stone fill are required, additional loose panels can be supplied and fitted on site to separate the two types of fill materials.

The mesh can be specified as either Galfan coated or Galfan coated with an external organic polymer powder (PVC) coating, as required by design.

TECHNICAL SPECIFICATIONS

Fabric Type:

welded mesh

Wire Sizes Available:

Galfan Coated – 3mm, 4mm, 5mm

Galfan/PVC – 2.7mm/3.2mm overall, 3.8mm/4.3mm overall

Tensile Strength (wire):

Welded: 540 to 770 N/mm²

Weld Strength: 75% of the minimum ultimate tensile strength of the wire

Gabion baskets are folded when transported to the construction site in order to take up as little as space as possible. After transport, baskets are unfolded, connected and prepared for positioning.

Applications of gabions

Gabions are used in several engineering projects and serve various purposes. common applications of gabions are as follows:

oRetaining structures such as retaining walls (Fig. 7), revetment and toe walls to embankments and cuttings.

oCorrosion prevention structures for instance sea walls, river bank defenses, canal banks (Fig. 8), dams, weirs, groynes and for the protection of reservoirs and lakesides.

ocylindrical metal gabion is used for dams or in foundation construction.

oIt is employed as a noise barrier.

oGabions are also used as a temporary flood walls.

oIt is utilized to change the direction of the force of flood water around weak structure

oStepped gabions improve energy dissipation in channels.

oFinally, it is used for aesthetic purposes

welded gabion application

hexagonal gabion box application