Mechanical equipment at the Krasnoyarsk hydroelectric plant

Conclusions

• 1) The adopted unification of the crest and spillway bays and standardization of the gate slots made it possible to use 2640 tons of steel elements for two different purposes, permanently. The rational design methods (use of conical blind flanges, etc.) permitted saving 700 tons of steel.

• 2. The location of the penstocks on the downstream face of the dam permitted simplifying considerably the placing of concrete in the dam, since this operation was not interrelated with the erection periods for the penstocks.

• 3. The especially designed grab beams and lugs in the gantry cranes, for automatic coupling with the spillway gates, made it possible to avoid the difficult and prolonged operations required for lifting the gates by means of rods.

• 4. The corrosion-control rooms, equipped with modern cleaning and painting equipment, permit improving the operating conditions of the mechanical equipment.

• 5. The especially designed mechanical equipment — of unprecedented characteristics in the Soviet Union-for the low-level outlets of the second-stage dam, for heads of up to 98 m, permitted the passage of the flows through the structures, during construction, for about three years.

• 6. The availability of a highly mechanized base, means of transportation, and high-capacity erection cranes made it possible during all the construction stages to carry out opportunely the preliminary assembling of the equipment, to transport it to the construction site, and to reduce the erection periods.

• 7. The widely-applied method of installing in concrete blocks the embedded parts for the gates and the trashracks, without using dentated concrete members, made it possible to install them (a total of 1806 blocks, 3 to 6 m long and 10 to 20 tons in weight, were made and installed), with the placing of the concrete in the formwork being carried out ahead of schedule, which greatly reduced the construction periods. This method is recommended for other large hydroelectric plants. The initiators of this advanced construction technique obtained the required accuracy in the preparation of the blocks.