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江垭碾压混凝土坝依据防洪要求，于坝中间部位设置泄洪中孔。由于中孔存在对全坝段均匀上升带来施工难度并影响工期。为了在施工中作到既能保证工程质量又不给工期造成大的影响，对中孔部位施工方案进行了比较，经方案比选，在实际施工中采用预留槽方案，安装钢衬与浇筑二期混凝土。由于合理安排工序，使工期影响减少到较小程度。江垭碾压混凝土坝中孔部位的实际施工期为４个月，满足设计要求
According to the flood control requirements, the Jiangya roller compacted concrete dam shall be provided with spillway mesopores in the middle part of the dam. As a result of the existence of a full hole on the entire section of the average rise in construction difficulty and affect the construction period. In order to achieve both in the construction to ensure the quality of the project does not have a significant impact on the construction period, the site of the hole in the construction program were compared, the program comparison, the actual construction of the reserve tank program, the installation of steel lining and pouring Second phase of concrete. Due to the rational arrangement of processes, the impact of construction period is reduced to a lesser extent. The actual construction period of the middle hole of the Jiangya roller compacted concrete dam is 4 months, which meets the design requirements