Construction of Vishnugad Pipalkoti HE Project: GR Infraprojects
Dr. Rakesh Kumar Khali, Vice President Operations - Tunnel & UG Works, G R Infraprojects Limited, discusses the construction of Desilting Chambers and Connecting Tunnels for Vishnugad Pipalkoti HE Project, and highlights the planning process, construction methodology, innovations adopted, construction of access roads and connecting tunnels, non-availability of space for infrastructure, mitigation measures, execution challenges, and solutions, in the site’s adverse geological conditions and its very remote location.
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Vishnugad Pipalkoti HE Project is one of the major ongoing projects in the state of Uttarakhand, Chamoli District, designed to generate 444MW of power by harnessing the hydro power potential of the mighty Alaknanda River. Three Desilting Chambers, each with a size of 390 m (L) x 16 m (W) x 21.5m (H) are designed to eliminate suspended sediments from the water conductor system, and minimize the entry of sediments to the powerhouse, and ensure the safety and longevity of the turbines and other underwater parts. Construction of these closely spaced chambers and connecting tunnels posed numerous challenges due to the difficult rock condition, difficult terrain, and complex layout arrangements.
