Take a look at photos of the Riverbank Lodge problem before Gabion Baskets assisted with a project design proposal and costed solution. What made it easier was that the client was also assisted with practical on site training and shown the ease of erecting the structure, he sourced the rock, labor and T.L.B. and project managed the job himself with our site trainer/supervisor ;- Please contact Japie Van Heerden - 082-7722759 for any further information. Rock in Upington supplied by Willie – 083-7215857 of Sandvishawe BK.
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Take a look at the detailed plans that were created for this project.
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We can see the Gabion Basket products being offloaded, checked and prepared for safekeeping and delivery site.
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Here we can see the initial stages of the project at Riverbank Lodge in Upington, which started around 22 September, contract period was set at two months. About 1600m3 of Gabions to be erected. On site training, structure design and site visits were offered by Gabion Baskets in Johannesburg.
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The rock used in gabion installations is 100-250mm size un-weathered, with a minimum density of 2.6tons/m3, gabion void ratio of 65% solids, 35% voids, thus with a bulk gabion density of 1.6tons per m3. Unselected rock normally has about 30% waste or undersized material, thus please allow for 2tons of rock per m3. The rock is neatly packed into the basket by hand to achieve a neat front face appearance. Angular blasted rock is best due to the interlock strength, rounded rock can be used but does not give the same compressive strength as blasted rock, and is much more difficult to achieve a neat looking facing. Environmentally it does not make good sense to remove rock from the area as it effects local animal habitats and can enhance erosion in streams.
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The geotextile layer is very important to prevent the migration of fine rive bed soils through the mattress layer. We use a 210g/m2 layer of Bidim to prevent soil movement. The Bidim is placed at all gabion and soil contact faces, behind, below and on the sides of the gabion structure. Overlapping 300mm where necessary.
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Rock for mattresses are also 100-67% of layer depth, so 200mm for the 0.3m depth. The mattress thus has at least two layers of rock to prevent soil scour in the event of high water velocities. Mattress lids are supplied separately so as to have them out of the way during infill of rock. From a labor point of view we allow 1.0m3/man per day for gabions and 1.5m3/man/day for mattresses, as mattresses have now bracing and neat front facings that need to be maintained.
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Herewith more photo’s showing the installation of the mattress apron below the gabion structure on a layer of geotextile. On-site training for installation is taking place with our gabion toolkits showing the correct rock size and quality to be used and the correct lacing together of adjoining mattress units, using the Binding wire supplied with the materials. These units are laced together using the preferred lacing technique along all common joins so that the structure become one integrated monolithic wall.
To counter all future loads imposed on it in the long term. Base baskets and mattresses are all Class A Galvanised and PVC coated to prevent long term corrosion of steel wire along the water’s edge. Higher basket layers do not require this due to infrequent flooding to this level. Already they are achieving 30m3/day using 30 people on site, indicating production rates of 1man/m3/day, for the erection of the basket, including , bracing, lacing and packing.
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The structure is proceeding well, and visual evidence of progress is now very evident. We are racing against the imminent river rise when the rain comes.
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Herewith more photo’s showing current progress on the riverwall in Upington. All seems to be going well and with speed. The owner is also involved with monitoring progress on site and is impressed with progress.
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It is continuing as before with rock being supplied in greater amounts now, there was a time when the rock was a little oversized, as a maximum 250mm size is allowed, this has now been corrected.
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More photo’s now taken as the project continues, we have received many more gabion inquiries from the Northern Cape area due to this project. As can be seen now they are achieving more than 30m3 per day, as they place and prepare a whole section of baskets first, before placing the rock into the baskets and tying them down the following day.
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The project has been progressing smoothly and updated photos can be seen below.
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The project is complete and our client is very satisfied with the outcome.
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