The Venda Nova III Pumped Storage Power Station: Permanent DYWIDAG Anchors, TWIN-Corr System, ensure higher Energy Production
With an installed capacity of 781MW, the Venda Nova III Power Plant is Portugal’s largest pumped storage power station. The construction of this project in northern Portugal started in 2010. The new power plant increases the generating capacity of the existing power plants at the Venda Nova Dam on the Rabagão River and at the Salamonde Reservoir.
The project includes the construction of an underground powerhouse, a pressure pipe line, a surge shaft as well as several auxiliary shafts and access tunnels. The underground powerhouse will be equipped with two leftand right- turning (reversible) Francis turbines with a total maximum output of 781MW.
Within the scope of the project, a comprehensive slope stabilization program is being carried out in the Salamonde Reservoir. A more than 60m high slope embankment was built in the metasediment embedded in granite.
To stabilize the slope, DYWIDAG Sistemas Constructivos (DSC) supplied 45 permanent 5 strand DYWIDAG Anchors to the subcontractor Mota-Engil Engenharia e Construção S.A. The TWIN-Corr System Strand Anchors each have a double sheath. Permanent corrosion protection is achieved by strands that are greased, individually sheathed and covered by one corrugated sheathing at the factory. The bonded length is additionally protected from corrosion by a second, concentric corrugated sheath.
The TWIN-Corr System DYWIDAG Strand Anchors were produced at DSC’s plant in Madrid and pregrouted at the factory. The anchors were supplied to the jobsite with preconfigured anchor heads, and DSC provided on-site support during installation.
Due to the limited space on site, all anchors had to be transported individually and manually to the jobsite by site personnel. The following anchors were used for slope stabilization:
- 45 permanent DYWIDAG Strand Anchors with double sheathing, TWIN-Corr System, with 5 strands
- 2,300m of 25mm Ø GEWI®Plus Rock Bolts
- 30m of 35mm Ø GEWI®Plus Rock Bolts
- 768m of 57.5mm Ø GEWI®Plus Rock Bolts
- 1,000m of 32mm Ø GEWI® Rock Bolts
All of the rock bolts were supplied to the jobsite just in time within the tight schedule.
DSC is proud to have participated in such a technically demanding project together with Mota-Engil Engenharia e Construção S.A.