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Polyurea Dam Repair

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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Polyurea Dam Repair

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  1. A Case Study of the Girotte Dam in France By Murphy Mahaffey Director International Sales WIWA Wilhelm Wagner GmbH & Co. KG Polyurea Dam Repair

  2. Overview • History of the Girotte Dam • Design • Project Requirements • Application • Performance to Date • Contributors to the Project

  3. 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

  4. Construction of Girotte Dam

  5. 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

  6. Girotte Dam Design • Reservoir Surface Area is 75 ha / 8.7 million square feet

  7. 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.

  8. Girotte Condition Report 2006 Condition Report in March 2006 • Cracks observed in wall • Escapes at some membranes (leaks)

  9. Polyurea Material Specification and Budgeting Polyurea offered these advantages over other competing systems: • Fast setting • Sprayable • High-Build • Ease of Application • Exceptional Life

  10. Safety Considerations • Difficult Access • Harness Work • Changing Weather Conditions • Temperature, Wind • Elevation • Communication with Sprayer • Environmentally Sensitive Area • Equipment Operation • Material Handling

  11. 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

  12. Polyurea Application • Identify and Mark Cracks • Grind Cracks Down

  13. Polyurea Application • Apply 2-Component Epoxy Primer

  14. Polyurea Application Equipment Requirements • 110 Bar / 1,600 psi spray pressure • 70C / 160F material temperature

  15. Polyurea Application Equipment Requirements • Full access to Wall Base 45m • Heated Hose • High Delta T Heaters • Impingement Mixing Spray Gun

  16. Polyurea Application Equipment Safety Requirements • Over Pressure Shutdown • Over Temperature Shutdown • Ratio Monitoring

  17. Polyurea Application

  18. 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

  19. Performance to Date System Performing Within Specification

  20. Polyurea Dam Repair Success

  21. Contributing Companies SPIE Batignolles- Application BMS- Equipment Supplier Tradecc- Polyurea Material WIWA- Equipment Design and Technical Support WIWA France- Laksander Michel

  22. 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!

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