Mobilisation is currently under way for construct-ion of a 26km long tunnel to form an integral part of the $304m Yuncan Hydropower Scheme in the Andes, 330km northeast of Lima, Peru.
The tunnelling work is the major factor in the run-of-the-river power station. A JV led by Skanska International Civil Engineering and including local contracting company Cosapi and Japanese construction company Chizaki will build the tunnel using TBM and drill+blast techniques. Drill+blast operations were expected to begin in late August. The TBM drive will start in January 2000.
There will be nine tunnel drives. Seven, totalling 10km, will be driven by drill+blast, including: the intake, the penstock and the tailrace tunnel; and five short sections of the headrace tunnel. The drill+blast cross sections will vary from 9.3m² to 17.3m². The remaining 16km will consist of two drives by two TBMs.
The first 10km drive will be performed with a 3.5m diameter Atlas Copco TBM. A 4.1m diameter Robbins will carry out the second 6km drive. At the base of the penstock, a 46 000m³ underground powerhouse will also be built.
Client for the project, Empresa de Generacion de Energia Electria del Centro (EGECEN), working for the Ministry of Energy and Mines (MEM) awarded the contract after an international competition. The JV will work alongside the Electric Power Development Co., Japan, consultant for the review of the studies for the project and also the Engineer. The construction period is three years. The civil work contract price is estimated at $117m.
The project is being funded by a loan from the Overseas Economic Corporation Fund of Japan.
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