在锦屏一级双曲拱坝建设工程中,大体积混凝土用聚氯乙烯苯板做混凝土保温材料,养护期满以后保温材料予以拆除,并对其表面缺陷进行处理。由于牛腿倒悬水平长度大、苯板拆除量大、施工难度大、安全风险突出等因素影响施工中必须引起高度重视,本文提供的施工方案,可供类似工程借鉴。 In the Jinping first-class double-arch dam construction project, mass concrete with PVC board made of concrete insulation materials, after the expiry of conservation to be removed, and its surface defects were processed. Due to the large horizontal length of corbels hanging back, large amount of benzene board to be demolished, large construction difficulty and prominent safety risks, it is necessary to attach great importance to the construction. The construction scheme provided in this paper can be used for reference for similar projects.