水电站压力输水道中复杂组合三通薄壁岔壳(以下简称岔壳),它在抽水蓄能式电站输水道的分合流工程、输油、输气、供水、国防等方面均有应用,其中尤以水电站的分流工程最为普遍,规模也大。然而岔壳的现行设计方法是较任意的,平面布置主要考虑施工简便,对次主壳、支壳直径的确定,则单纯按发电机 The complicated combined three-way thin-walled fork shell (hereinafter referred to as the fork shell) in the pressure water transmission line of a hydropower station is applied in the diversion and diversion project of the water conveyance channel of a pumped-storage power station, oil transportation, gas transmission, water supply and national defense, among which Especially in the diversion project of hydropower station is the most common, large-scale. However, the current design method of fork shell is more arbitrary. The layout mainly considers the construction is simple. For the determination of sub-shell and branch shell diameter, simply press generator