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二江泄水闸下游护坦和三江冲沙闸一级池护坦为全封闭排水型式。两者的分块伸缩缝止水布置见第1页图1。二江泄水闸建成运用时,在护坦斜坡段上最大流速为每秒22米左右。汛期有大量沙、卵石过坝。其中有硬度较大的长石和石英,含量高达70％。为满足护坦混凝土抗冲耐磨要求,在护坦顶面,选用600~#纯大坝水泥拌制的二级配400~#混凝土(或称为高标号
The lower reaches of the Second Jiang sluice Tributary and Sanjiang red sand gate of a closed pool for the entire closed drainage type. The two block expansion joints stop water see Figure 1 on page 1. When the two rivers’ sluice gates were completed and put into operation, the maximum flow rate at Paipan slope was about 22 meters per second. Flood season has a lot of sand, pebbles over the dam. Among them, there are feldspar and quartz with hardness of up to 70%. In order to meet the requirements of the impact and abrasion resistance of concrete balconies, the top of the balconies should be made of 600 ~ # pure dam cement with two grades of 400 ~ # concrete (or high grade