Design and Installation of Prestressed Rock Anchors for Penstocks at the Sheldon Springs Project

by Panchanatham N. Sundaram, Bechtel Civil, Inc, United States,
Peter Yen, Bechtel Civil, Inc, United States,

Document Type: Proceeding Paper

Part of: Waterpower '89


A mini-hydroelectric project producing 25MW of power was recently completed near St. Albans, Vermont. The power conduit conveys water from the intake on the river to a bifurcation and approximately 100ft beyond it to the power house. Stability analyses of the bifurcation and bend, for different cases of hydraulic loading, showed that a thrust block would be required to ensure stability. However, space constraints around the structure eliminated the use of a sizable thrust block. As a result, prestressed anchors were selected. Trial pull-out tests were conducted to determine the required anchorage length and to optimize the grout mix. Anchors were installed in winter and precautionary measures were taken to prevent grout from freezing during mixing and injection.

Subject Headings: Prestressing | Rocks | Anchors | Conduits | Water intakes | Hydraulic loads | Thrust | Grouting | Vermont | United States

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