向家坝水电站升船机渡槽段为大跨度穹顶结构，其下部为电站厂房安装间，穹顶施工时也正是机组安装的关键时期。为确保穹顶施工过程中不发生高空掉物和自身的施工安全，将原设计的“贝雷桥架模板支撑体系＋现浇方案”改为“弧形移动支撑样架＋预制弧形拱＋安全防护桁架”的施工方案，有效避免了穹顶模板拼装及上部混凝土施工期间对下部安装间机组安装的干扰，确保了施工安全，缩短了直线工期。%The ship-lift′s aqueduct section of Xiangjiaba Hydropower Station is above the assembly bay of the powerhouse with long-span dome .The dome construction is in the key period of generating unit installation .In order to ensure the construc-tion safety without object falling , the construction scheme of arc -shaped mobile supporting frame plus precast arch and safety protection truss"is adopted to replace the original design of Bailey frame formwork support system plus the cast -in-place.It is proved that the new scheme effectively avoids the interference to the installation of generating units from the dome template assem -bly and the upper concrete construction , so as to ensure the construction safety and shorten the critical construction period .
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