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A Case Study of the Girotte Dam in France By Murphy Mahaffey Director International Sales WIWA Wilhelm Wagner GmbH & Co. KG. Polyurea Dam Repair. Overview. History of the Girotte Dam Design Project Requirements Application Performance to Date Contributors to the Project.
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A Case Study of the Girotte Dam in France By Murphy Mahaffey Director International Sales WIWA Wilhelm Wagner GmbH & Co. KG Polyurea Dam Repair
Overview • History of the Girotte Dam • Design • Project Requirements • Application • Performance to Date • Contributors to the Project
History of the Girotte Dam • Located in the Rhone-Alpes Region near Hauteluce • Girotte Lake producing electricity since 1903 • Built from 1942-1949 • First Sub-Glacial inlet structure in the world
Girotte Dam Design • Multiple Arch and Buttress Design • 18 Arches held by Fixed Buttresses • Unreinforced Concrete • Due to Shortage of Steel • 45 m / 148 Feet Tall • 510 m / 1,675 feet long • Spans a mountain ridge • 1,747m /5,732 feet elevation
Girotte Dam Design • Reservoir Surface Area is 75 ha / 8.7 million square feet
Girotte Dam Conditions • Difficult Weather Conditions • Cycling Temperatures and Elevation are demanding on a Concrete Structure, morning temperatures on job were 10C / 50F • Aggressive Glacial Waters from Tré-la-Tête Glacier • Wind Erosion • Elevation 1,747m / 5,732 feet • Aggressive Glacial Water • Multiple Coatings over time- paint, resin, etc.
Girotte Condition Report 2006 Condition Report in March 2006 • Cracks observed in wall • Escapes at some membranes (leaks)
Polyurea Material Specification and Budgeting Polyurea offered these advantages over other competing systems: • Fast setting • Sprayable • High-Build • Ease of Application • Exceptional Life
Safety Considerations • Difficult Access • Harness Work • Changing Weather Conditions • Temperature, Wind • Elevation • Communication with Sprayer • Environmentally Sensitive Area • Equipment Operation • Material Handling
Polyurea Application • Visual Inspection • Individual drops by rope and harness over all 18 arches and buttress • Top of Dam to Base • Safety is a Priority
Polyurea Application • Identify and Mark Cracks • Grind Cracks Down
Polyurea Application • Apply 2-Component Epoxy Primer
Polyurea Application Equipment Requirements • 110 Bar / 1,600 psi spray pressure • 70C / 160F material temperature
Polyurea Application Equipment Requirements • Full access to Wall Base 45m • Heated Hose • High Delta T Heaters • Impingement Mixing Spray Gun
Polyurea Application Equipment Safety Requirements • Over Pressure Shutdown • Over Temperature Shutdown • Ratio Monitoring
Polyurea Job Details • 1,200 Kilos / 2,645 lbs. of Polyurea Sprayed • 110Bar / 1,600 psi; 70C / 160F • Applied over 5 Days • Changing Weather Conditions
Performance to Date System Performing Within Specification
Contributing Companies SPIE Batignolles- Application BMS- Equipment Supplier Tradecc- Polyurea Material WIWA- Equipment Design and Technical Support WIWA France- Laksander Michel
Polyurea Dam Repair A Case Study of the Girotte Dam in France By Murphy Mahaffey Director International Sales WIWA Wilhelm Wagner GmbH & Co. KG Thank You!