Pipe pile wall construction work at Viljuisk hydro power plant in Yakutia Russia 21.6.2017 Overview The goal of this project is to secure the reinforced concrete bottom and wall slabs of the incoming water channel and also to prevent their final breakage and flushing away by water flow. The project owner is Russian State energy company «Rushydro» and it is projected by OAO “Lenhydroproject” engineering company from St. Petersburg in cooperation with Robit Rocktools. From Robit ´s side the project was supported by Mr. Kari Juntunen and Mr. Juha Sorjonen. The project also included underwater drilling which was made during the operation of hydro power plant. The project included the following stages: diving operations in the depth of 8-9 m with water flow rate of 0,5 – 1,0 m/sdrilling through

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