Assembling and placing of Gabions

We supply of Gabions made up of hexagonal double twisted galvanised iron wire, the gabion boxes shall have hexagonal oven mesh with amaximum size of 10cm x 12cm with the joints fonned by twisting each pair of wires through three half turns.

Wire used for the fonnation of the mesh panel will have a diameter of 3.0mm, All wire used in the used for the fonnation of the mesh panel will have a diameter of 3.0mm, All wire used in the manufacture of gabion boxes and in the wiring operations during construction shall be heavily coated with zinc. The minimum weight of zinc coating shall be as follows:

The adhesion of the zinc coating to the wire shall be strong enough of an extent that when the wire is wrapped six turns around a mandrel of four times the diameter of the wire, it does not flake or crack to such an extent that any zinc can be easily removed by rubbing with the bare fingers, Diaphragms shall be supplied to divide each gabion unit into cells to control movement of fill material within the gabion.

The diaphragm to be provided shall be equally spaced at a distance of 1 m along the length of the gabion. The diaphragms shall be selvedge to a diameter of 3.9 mm.

Gabion Fill:
The stone fill material used for filling the gabion units shall be clean, hard stone with pieces ranging from 4-8 inches on the greatest dimensions. Stone filling shall not exceed 24 inch vertical drop above the gabion basket. All effort shall be made to ensure that the stone fill material utilized in the design of the structure match the stone fill used in constructing the gabion structure.

 
Assembling and placing:
•Each gabion shall be assembled by tying or fastening all untied edges. The binding wire shall be tightly looped around every other mesh opening along the seams in such a manner that single and double loops are alternated. Alternative fasteners may be used in lieu of lacing wire. The alternative wire fasteners shall be applied at approximately 4" to 6" intervals on all vertical seams. No less than 3 fasteners per one foot on any given vertical or horizontal seam.

•A line of empty gabions shall be placed into position according to the contract drawings. Lacing wire or alternative fasteners shall be used to secure each unit to the adjoining one along the vertical reinforced edges and the top selvedges. An approved corner closure tool shall be used to adjoin adjacent gabions to insure a tight, neat seam and minimize gabion wire joint deformation. The base of the empty gabions placed on top of the filled line of gabions shall be tightly wired or fastened to the latter at front and back. The lid shall be secured with an approved closure tool to insure proper closure without excessive mesh deformation.

•To achieve optimum alignment and finish for retaining walls, a minimum amount of stretching may be required.

•Connecting wires shall be inserted during the filling operation as follows: Install according to manufacturer’s instructions every 1' vertical lift of the gabions unit.