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(一) 概述根据枢纽及结构布置需要,紧水滩大坝坝体共设横缝19条分成120个坝段,共计96个灌区,面积16404m~2。横缝从河床段的基岩面高程92.00m至坝顶高程194.00m,共分7区,每灌区高度一般为15.0m。随着坝体的升高坝厚度逐渐减少,灌区面积也相应减少,最大为443.0m~2,最小为45.0m~2。(二) 横缝灌浆施工紧水滩水电站大坝坝体下部向上游方向倒悬,施工期坝址承受拉应力,坝体的升高受横缝灌浆的高程控制。设计要求:在120.00m高程以下的横缝灌浆未结束,坝未成拱之前,坝体浇筑高度不得超过150.00m高程;1986年电站下闸蓄水前并缝高程必须达到164.00m高程;依据薄拱坝温度场的变化特点,横缝灌浆须安排在每年的低温季节和坝体温度最低的时段
(I) General According to the needs of the layout of the hub and structure, a total of 19 horizontal and vertical joints of the dam of Shumuitan Dam are divided into 120 sections, with a total of 96 irrigated areas with an area of 16,404m ~ 2. The transverse seam height from bedrock surface elevation 92.00m to crest elevation 194.00m, is divided into 7 areas, each irrigation area height is generally 15.0m. As the thickness of dam rising dam gradually decreases, the area of irrigated area also decreases correspondingly, with a maximum of 443.0m ~ 2 and a minimum of 45.0m ~ 2. (B) horizontal joint grouting construction Jishuitan Hydropower Station Dam body to the upper reaches of the lower part of the hanging upside down during the construction site of tensile stress, dam elevation by the transverse grouting elevation control. Design requirements: Under the elevation of 120.00m, the transverse grout grouting is not over. Before the dam is not arched, the height of the dam should not exceed 150.00m. Before 1986, Dam temperature changes in the characteristics of the transverse grouting to be arranged in the annual cold season and the lowest dam temperature