Underground Structures

Laúca River Diversion, Angola

The construction of two diversion tunnels and the diversion of the River Kwanza has created conditions for the subsequent construction of the dam for the 2,067 MW Hydropower Plant Laúca. In total, 1,021 m of tunnels, with an internal diameter of 14 m, were excavated by drill-and-blast. Rock support was provided by steel-fibre reinforced shotcrete and rock bolts. Lahmeyer assisted the client during tendering and tender evaluation, and was awarded a contract to review and approve the structural drawings for execution and provided construction management and supervision.more

Laúca Main Works, Angola

In 2013, The Angolan Government has started the construction of the Laúca Hydropower Project with an installed capacity of 2,067 MW, presently one of the largest hydropower projects in Africa. As a member of an International Consortium, Lahmeyer was contracted for the design review and supervision of the dam, hydraulic power circuit and the powerhouse, including the electro-mechanical equipment. Lahmeyer will give assistance during commissioning and initial operation as also for the supervision during the first year of the warranty period.more

Mohale Tunnel, Lesotho

The Mohale Tunnel is part of Phase 1B of the Lesotho Highlands Water Project and is designed to transfer water at an average discharge of 9.5 m³/s from the Mohale Reservoir to the Katse Reservoir.more

Pumped Storage Plant Goldisthal, Germany

The pumped storage plant Goldisthal, with an installed capacity of 1060 MW, is located in the Thuringian Forest. The upper reservoir is formed by a circular rockfill ring dam with asphaltic concrete surface sealing. The power cavern houses 4 sets of pump-turbines and generator motors. 2 units are of conventional fixed speed hydro units, and 2 units are double fed induction machines plus cycloconverters for adjustable speed control. The lower reservoir is formed by a 67 m high asphalt core rockfill dam. more

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