The Manuel Piar hydropower station and Tocoma Dam are located approximately 85 km from the town of Puerto Ordaz in the federal state of Bolívar in Venezuela. The project is the last phase of a construction project aimed at ensuring electrical energy supply in this region. After its completion, the power plant with its ten 216 MW generators will have an annual capacity of 12,100 GWh.
Tocoma Dam is located on the Caroní River and has an impounding capacity of 13 mio. m³. The main dam is 300 m long and 82 m high. The dam's spillway is 175.86 m long, and the crown is 106.3 m above sea level.
For retaining the girders supporting the axis of the spillway's swing gates, DSI supplied a total of 66 t of strand as well as 140 anchorages and 140 bond anchorages.
Metal ducts with a total length of 3,500 m
The strand tendons were installed in metal ducts with a total length of 3,500 m. In addition, a total of 216 four meter long, Ø 36 mm bar tendons were needed for retaining the swing gate hydraulic winches on the spillway.
For installation work, DSI supplied a HOZ 5400 Tensioning Jack, hydraulic pumps, an uncoiler and load cells for load monitoring. In addition, DSI rented another tensioning jack, a hydraulic pump and a grout machine with pump for grouting the bar tendons. Postensado V.N. Industrial de Venezuela S.A. tested the tendons and performed the installation, tensioning and grouting work.