GABION 39 SYSTEM
Gabions manufactured from dimensionally stable panels of mesh that are formed by welding transverse and longitudinal wires at each and every intersection to form a grid.
The gabion 39 box is then part assembled by hinging the face, back, sides and internal diaphragms to the base panel and the lid to the rear panel with ‘C’ rings or clips. The units are transported to site flat packed with lacing wire as standard for on-site erection.
On site, the mesh gabion unit is opened out in the required position and the sides, diaphragms, face and rear panels are rotated to the vertical position and joined with a continuous lacing operation (wire supplied as standard), helicals or ‘C’ rings (supplied at additional cost). Joints between courses are normally continuously laced or clipped with ‘C’ rings.
Once assembled, the mesh gabions are filled with stone or rock and the lid secured to form a monolithic structure in accordance with the recommended installation procedures.
GABION 27 SYSTEM
Gabion 27 Systems are modular welded mesh units introduced into the UK market to improve the quality, speed of installation, as well as to reduce the walls sectional design requirements. This combination of benefits result in savings on labour costs, overall material supply and associated earthworks.
The Gabion 27 System comprises of units that are sub-divided into 675mm cells along the length of the cage. Construction is such that the base of the gabion forms the lid of the unit below. The base is extended by fixed dimensions on one face to allow for a predetermined stepping arrangement at each course. The base on the other face is flush, allowing for a flush faced wall to be constructed if required or coursing with a combination of flush and stepped faces.
The use of combined lids and bases reduces the construction time, but does not compromise the structural integrity of the system. The mesh weight to volume ratio is greater with this system than the Gabion 39 system and the distribution of mesh within the structure is more even thus producing a higher quality of installation.
The face and rear panels are manufactured from a heavier mesh wire diameter to maintain both better linear and lateral alignment.
The 686mm cell height means that no difficulty occurs in stone filling and hand facing of the gabion system.
Vertical jointing for assembly utilises helicals (supplied as standard) to encompass all the mesh at one juncture, reducing installation time whilst providing the strongest joint. The helical also encompasses the cut ends of mesh which is an import health and safety issue where gabions are used in public areas.
Horizontal joints can be helicalled but are normally formed by a continuous lacing system (supplied as standard) or clipped with ‘C’rings (at additional cost).
Gabion cladding units are a welded wire mesh box system that is configured in a different way such that the unit is sub-divided into cells both horizontally and vertically, allowing each course of cells to be filled. Normally the course lift is 675mm high but for overall heights that are not a multiple of 675mm, the cell height at the base can be manufactured up to 1m in height or the top cell reduced in height providing it is not less than 150mm.
For handling, the maximum height of unit is 1.950m and up to 2.025m wide divided into nine equal cells.
All gabion cladding units have helicals supplied for exposed vertical joints and lacing wire for horizontal joints. The mesh wire diameter is normally not less than 4.0mm.
Cladding units are normally secured to a suitable wall with clamp bars or clamp discs. Where no suitable support wall is available, column members are buried in the gabion to take the lateral loads.
The maximum height of gabion cladding is normally 3.0m, but can be increased providing a horizontal beam is provided at 3.0m heights to take the vertical loading from the cladding.
Formed from wire grid and welded at the intersections to give dimensionally stable mesh panels.
The trapezoidal box is based on the Gabion 27 System and is formed by hinging the face and back panels to the base panel and the lid to the rear panel with ‘C’ rings or clips. The unit is provided with preformed frames of the required shape that are fitted in the factory to the base panel and/or supplied loose for fixing on site.
On site, vertical joints are helicalled (supplied as standard) and horizontal joints are continuously laced (wire supplied as standard) or can be clipped with ‘C’ rings (supplied at additional cost).
To close the ends of a run of units, special bespoke trapezoidal gabion panels to the required shape are supplied and fitted on site.
The units are transported to site flat packed for assembly on site.
Once erected, the gabions are filled with stone or rock and the lid secured to form a monolithic structure.
Terraqua ES provide a full design, supply and installation service.