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Saturday, October 31, 2009 |
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Bospoort Dam – Rehabilitated and safer
:: News
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Source: Shaun Butler
Some 18 months down the line, the rehabilitation of the Bospoort dam for client DWAF (Department of Water Affairs and Forestry) is almost complete. The dam has been rehabilitated in line with safety requirements.
“Whilst work was underway it was imperative to control the water level of dam in order construct 80% of the works,” says Shaun Butler, contracts director. “However, we had to do so without limiting the water supply to the water works and the community down stream”.
During the duration of the contract the main dam has been modified, including the removal of the existing spillway gates. The demolition of the dam spillway crest (NOC), non-overspill crest, piers, decks, slabs, training walls and NOC took place under extreme caution to ensure the existing post tendon cables of the dam were not damaged.
A total of 15 000m3 of concrete was placed on the dam wall comprising of labyrinth walls, buttresses, outlet works, NOC and auxiliary spillway, with the majority of work taking place 26m above ground.
A total of 75 000m3 of mainly rock was excavated for the new concrete saddle spillway some 75m long, in which curtain grouting was required as well.
Three saddle embankments were reconstructed and a new stabilized toe on the upstream side of the structure
was formed through dumping of material to approximately one third of the height of the structure. New rip rap protection was bedded on the upstream face to replace the existing protection, while a new gravel protection layer was installed on the downstream face.
“There have been many contributors to this project,” says Shaun. “Our client DWAF, the engineers - GOBA & ARQ
joint venture, Stefanutti Stocks Earthworks, Stefanutti Stocks Geotechnical and of course our site team, were all instrumental in the successful completion of works”.
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