Ventilation design and construction of lined air duct for outlet shafts of Baihetan Hydropower Station

The outlet shafts of Baihetan Hydropower Station are deeply buried underground, and the height of each section is more than 100 m, and natural ventilation can not meet the ventilation design requirements of the outlet shafts. This paper presents the ventilation design scheme and air distribution characteristics of the outlet shafts，analyses the manufacturing scheme of the lined air duct for narrow and irregular civil wind wells, and puts forward the construction scheme of lifting and assembly of the lined air duct for civil wind wells.