Paradise Dam Spillway Upgrade – Stage 1, Childers QLD
Nathan contracted to SRG Limited to construct FRP works for Stage 1 of the Paradise Dam Spillway Upgrade. The upgrade project resulted from changes in State safety legislation and required a significant upgrade of the main the spillway.
The project scope of works included drilling of anchor rods into the wall and capping them with a concrete slab on two 45m long monoliths at either side of the spillway. Nathan’s scope for the FRP works included the placement of reo, installation of water-stop, form work and concrete placement and extension of the right-hand bank training wall, and project engineering support to SRG. Nathan work crews operated under a FIFO arrangement and a 24hr roster, 7 days a week.
The client SRG and the owner SunWater placed a high importance on work safety, construction quality and the project being completed on time before the start of the wet season.
Project challenges: the program was tight owing to the likelihood of a major water surge at the start of the wet season. Hence Nathan operated a 7-day x 24 hr work roster with two crews. The Surface finishes required on concrete were of a high standard and Nathan achieved the specified tolerances, without defects.
Facts & figures
Contract duration: 22 weeks
Workforce: 12 form workers, reo fixers and concreters
Quantities: supply and placement of 125 tonnes of reo; formwork and placement of 1,051m3 of concrete; installation of 172m of water stop.
Equipment utilised: a 20T Franna crane, 250T slew crane, 65m Concrete pump.
Paradise Dam Spillway Upgrade – Stage 2, Childers QLD
Nathan contracted to SunWater Limited for the construction of the 2nd stage of the Paradise Dam Spillway Upgrade. Following changes in Qld safety legislation, the dam spillway required upgrading. The works involved the drilling of anchor rods into the dam wall and their capping with two 45m long concrete monoliths at either side of the spillway.
Nathan’s scope consisted of the construction of 7 x 45m long infill steps, 2 x 45m tie in steps, modifications and repairs to the Left Bank Training Wall, and the installation and repairs to the Left Bank Stairs. This included: the hydro-demolition of 40m3 of concrete, break back and surface preparation of 560m2 of existing concrete, installation and chemical epoxy of 1769 anchor bars, supply and installation of 60T of reinforcing steel, installation and the chemical injection of waterstop, formwork and concrete placement for 320m3 of concrete.
Nathan supplied all materials, labour and equipment for the works; concrete was batched on site and supplied by Sunwater.
Project challenges: as with Stage 1 of the project, the construction program was very tight owing to the likelihood of a major water surge at the start of the wet season. Nathan operated a 7-day x 24 hr work roster with two crews. Concrete surface finishes were specified within tight tolerances and concrete mixes were designed with a low slump. Hence concrete placement and finishing had to be expedited quickly. Nathan achieved both the target program and the quality specified.
Facts & figures
Contract duration: 26 weeks
Workforce: 13 form workers, reo fixers and concreters
Quantities: hydro-demolition of 40m3 of existing concrete; break back and surface preparation of 560m2 of existing concrete; install and chemical epoxy 1769 anchor bars; supply and install 60T of steel reo; install / chemical injection of water-stop; formwork and placement of 320m3 of concrete.
Equipment utilised: a 20T Franna crane, 250T slew crane, 65m Concrete pump, Manitou.