Under the protection of phase-Ⅲ upstream and downstream dry-season cofferdams,the downstream phase-Ⅲ allyear cofferdam in Tingzikou Water Control Project can be constructed in dry environment.Based on the actual condition,the construction method of downstream phase-Ⅲ all-year cofferdam is optimized.The pouring of cofferdam concrete core wall below normal low-water level is completed in dry season,and after flood season,the pumping of pit and the excavation of pit foundation is immediately conducted when the water level is below than the top of core wall.The construction method of phase-Ⅲ all-year cofferdam can speed up the construction and saves the costs on cofferdam filling material excavation and transportation.%亭子口水利枢纽工程三期下游全年围堰在三期上下游枯水期围堰的围护下,具有干地施工的特殊条件.结合现场实际情况,对围堰施工方案进行了优化,在汛前提前进行了枯水期常水位以下围堰心墙施工,使得汛后水位下降、混凝土心墙外露后即可展开基坑抽水和开挖工作,达到了加快施工进度和减小围堰填筑料挖运成本的目的.
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