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SABIE RETAINING WALLS

SABIE RETAINING WALLS

The gabion walls along the road near Sabie in Mpumalanga are now almost complete, there are four walls in total with various lengths. The first retaining wall is 4 metres high and is used to retain the cut slope-embankment, reduce water velocities off the tailings slope and act as a rock catch wall for silt and rock/debris coming off the cut slope, thus preventing this material falling onto the roadway.

The gabion walls along the road near Sabie in Mpumalanga are now almost complete, there are four walls in total with various lengths. The first retaining wall is 4 metres high and is used to retain the cut slope-embankment, reduce water velocities off the tailings slope and act as a rock catch wall for silt and rock/debris coming off the cut slope, thus preventing this material falling onto the roadway.

The second gabion wall below the roadway(halfway up the fill slope) will prevent lateral movement of soils from next to and below the roadway. Thus reducing the risk of roadway settlement and failure, we assisted with the supply of gabion materials, geotextile and toolsets to the site. When the work started we assisted the contractor with the on-site gabion training during initial erections which went off well in the end and made for rapid erection and skills transfer on site. This gabion project should be complete by end October 2009.

Please view the rock spoil photo below and note the reason that most gabion contractors allow for about 30% waste or fines in the rock costing calculation, as this finer material generally cannot be used inside the gabion container as the rock size is too small or consists predominantly of finer material.

We suggest the use of gabions tool sets to improve gabion installations on sites, our gabion frames shown in the photo below allow for better basket shape once filled correctly. The baskets should be tensioned horizontally or vertically before the filling process takes place, the tension direction is dependant on whether you have an external horizontal or vertical mesh direction. Please contact us for further explanation regarding this interesting concept. All gabion walls generally use a geotextile behind and below the wall to reduce fine soil leaching through the gabion wall.

Gabions are a common application in the world and we try to help wherever we can to show how easy they are to be installed on sites using a local unskilled labour force.

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