Abstract:
A surface hydro power station houses generating equipment having rotating parts mounted on a vertical shaft like rotor of electric generator and runner of hydro turbine, which transmit typical forces, like short circuit torque from generator and water pressure in scroll case around the runner, to large mass of concrete around the scroll case. in addition, the forces resulting from' horizontal and vertical loads transferred from". gantry columns of electric overhead traveling (EOT) crane, used for erection and maintenance of the generator and turbine, to the mass concrete around draft tube connected to bottom of the runner for conveying water to tail race.
The large mass of the concrete around the scroll case and the draft tube is considered basically a mass concrete structure acted upon by a number of horizontal and vertical forces. This concrete mass is generally heavily reinforced. For structural design the structure is usually divided into two parts (i) substructure, which houses the draft tube of hydro turbine (ii) intermediate structure, which encases scroll case and supports the generator....
