磨子水电站外挂钢罩气垫式调压室施工技术

Construction technology of air cushion surge chamber with external steel cover in Mozi hydropower station

丹巴县磨子水电站,总装机容量70MW,采用气垫式调压室,洞室围岩总体为Ⅲ、Ⅱ类岩体,闭气条件较好。在气室的端墙、边墙和顶拱设置平压腔,将长80m的调压室分隔成17段拱,每拱间距4m。调压室闭气用外挂钢罩式钢筋混凝土封闭各拱段,平压腔用钢板封闭。施工的重难点在于调压室洞挖、钢板安装和钢筋混凝土衬砌三道工序。