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Contractors World 2011 Volume 2 Issue 10
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Conjet Robot assists with repairs to Guri Dam spillway Conjet Robot assists with repairs to Guri Dam spillway





Robot assists with repairs to Guri Dam spillway

The 10,235 MW capacity Guri Hydroelectric Power Station in Venezuela is one of the world’s largest hydroelectric power generation schemes.

Officially know as Central Hidroeléctrica Simón Bolívar, it was built in the state of Bolivar to dam the River Caroni across the Necuima Canyon, about 100 km upstream with its confluence with the River Orinoco, one of the longest rivers in South America. The scheme’s 20 turbines, equally split in two separate powerhouses, have an annual generating capacity of 47,000 GWh and account for around 70% of Venezuela’s power requirements.

Guri went on stream in 1978, but the original 2,935 MW power station was expanded in 1986 to its current capacity, creating a reservoir covering 4,250 km².

cwmags-conjet-Fapco proposed the hydrodemolition technique of using high pressure water jetting to selectively remove only the weakened and damaged sections of the concrete spillway, and leave a very rough surface for bonding on the fresh concrete.

The surfaces on parts of the spillway needed repairing and the Venezuelan government’s power station owner and operator, Corporación Eléctrica Nacional, awarded a contract for the spillway renovation to the local general and civil engineering contractor Fapco C.A. based in Puerto Ordaz, Bolivar.

The height of the combined concrete gravity and earth embankment dam was raised to 162 m and crest length increased to 7,426 m. Steel gates on top of the concrete section of the dam control overflow from the reservoir down three huge adjacent spillway channels, which have a combined flow capacity of 27,000 m³/s.

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