Empty gabion baskets shall be assembled individually and placed on the approved surface to the lines and grades, the tops of all sides are level.
All gabion baskets shall be properly staggered horizontally and vertically. Finished gabion structures shall have no gaps along the perimeter of the contact surfaces between adjoining units.
All adjoining empty gabion units shall be connected along the perimeter of contact surfaces to obtain a monolithic structure.
All lacing wire terminals shall be securely fastened.
All joining shall be made through selvedge-selvedge or selvedge-edge wire connection; mesh-mesh wire connection is prohibited except in the case where baskets are offset or stacked and selvedge-mesh or mesh-mesh wire connection would be necessary. Fasteners shall be installed at each mesh opening at the location where mesh wire meets selvedge or edge wire.
Gabion Basket Placing:
The initial line of gabion basket units shall be placed on the prepared filter layer surface and adjoining empty baskets set to line and grade, and common sides with adjacent units thoroughly laced or fastened. They shall be placed in a manner to remove any kinks or bends in the mesh and to uniform alignment. The basket units then shall be partially filled to provide anchorage against deformation and displacement during the filling operation. The stone shall be placed in the units as specified or directed by the manufacturer.
Deformation and bulging of the gabion units shall be corrected prior to additional stone filling. When the stone is placing, PVC coating on the gabions shall not be damaged if PVC coated gabions are utilized. All stone on the exposed face shall be hand placed to ensure a neat compact appearance.
Gabions shall be uniformly overfilled by about 1-3 inches to account for future structural settlements and for additional layers. Gabions can be filled by any kind of earth filling equipment. The maximum height from which the stones may be dropped into the baskets shall be 3'.
When excavation and foundation preparation are completed, the pre-assembled gabions shall be placed in their proper location according to the plans provided. Gabions shall then be connected together and aligned prior to filling with stone.
The stone fill shall have a gradation as specified. The stones/rocksl shall be placed into the gabion units in 1' lifts. Cells shall be filled to a depth not exceeding 1' at a time.
The fill layer should never be more than 1' higher then any adjoining cell. Connecting wires shall be installed from the front to back and side to side of the individual cells at each 1' vertical interval for gabions with a depth of 3'. The voids shall be minimized by using well graded stone fill and by hand placement of the facing in order to achieve a dense, compact stone fill.
All corners shall be securely connected to the adjoining basket of the same layer before filing the units.
When more than one layer of gabions is required, the next layer of gabions shall be connected to the layer underneath after this layer has been securely closed. Gabions shall be uniformly overfilled by about 1-2 inches to account for structural settlement.
Geo fabric shall be placed directly on the prepared area.
Longitudinal and transverse joints shall be overlapped at least 1000 mm.
The fabric shall be placed in such a manner as to have the least number of longitudinal joints. Wherever such joints occur the upper portion of the fabric shall overlap the lower portion.
The lower and upper end of the geotextile shall extend beyond the face line of the toe and crest of slopes respectively.
Welded mesh gabions are filled on site with hard and durable stones to form mass of gravity retaining structures. Due to their inflexibility, welded gabions are generally not considered suitable in areas susceptible to differential settlement, or in water courses.
The gabions are available in a variety of wire diameters and unit sizes to meet project requirements.
In common with all gabions during installation, all welded units need internal bracing wires to be overfilled to allow for settlement of the granular rock fill.
Gabions are delivered in folded flat-packed. All verical joints are factory fitted for quick assembly on site. The base and lid panels are connected with horizontal and helical. The bracing ties, spiral wires and joining accessories are prefabricated and adjusted to fit the Gabion type.
Take a Gabion from a pallet and cut the securing brace. Lift the accesories and pull the Gabion untill full length is reached. Close the base helically and fold the ends 90° inwardly with pliers, to prevent sharp end and injuries.
According to applications, Gabions can be connected to form a long monolithic structure. Prefabricated joining pins are provided for each Gabion. The joining shall be done at both sides.
Bracing tie wires are used to prevent heavy deformation caused by filling rocks in the Gabions. Bracing ties are placed 4 meshes from the sides and around the weld. If not, the weld can break or the bracing tie can move. Repeat this principle untill the Gabions are fully filled.
After filling the Gabion, the lid can be closed. Use the included spirals and attach the lid at every edge including the diaphragm panel. Also twist the ends inwardly for safety reasons.