Gamka Dam, Beaufort West - February 2002

CLIENT:Dept. of Water Affairs and Forestry

CONSULTING ENGINEERS:ROTEK

SCOPE OF WORK:

• Removal and replacement of sluice gate rails.
• 30 meters of vertical rails of approximately 150kg each. Water depth 0 to 18 meters.
• Visibility 0.03meters with use of artificial lighting.
• Bolts being corroded and with limited visibility, existing rails had to be removed using Brocco Cutting and hoisted to top of tower for disposal.
• New Holes could not be drilled with rails insitu, hence accurate marking and drilling was required with the allowable hole tolerance of 3mm.
• Custom drilling equipment was required to drill a primary M20 hole through 40mm of steel, followed by an M18 core hole, 120mm into reinforced concrete.
• Rails were fastened using M16, A4 Hilti Hit500RE chemical anchors
• Rails needed to be carefully manouvered to avoid damage to the 1.5mm of anti corrosive paint spec.