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一、概述丹江口水利枢纽采用分期导流,第一期先围右岸,第一期围堰围护右岸基坑的时间自58年11月～59年10月底,共分两个阶段,第一阶段自58年10月～59年5月,基坑由低水围堰保护,低水围堰按此时段5%频率瞬时流量7,830M~3/C 设计,围堰顶高程为97公尺,围堰束狭河床按宽度比占58%,按面积比占50%,束狭河床平均流速4.46M/C。这一阶段的主要任务是抽水清基、修筑上下游混凝土纵向围堰(上游长210M 下游长120M)、坝体18跨、及上下游横向高水围堰。第二阶段自59年6～10月,基坑由高水围堰保护,在此时段除继续加高混
First, an overview Danjiangkou water diversion using staging diversion, the first phase of the first right bank, the first phase of cofferdam right bank foundation pit from November 58 to the end of October 59, is divided into two phases, the first phase From October 58 to May 59, the foundation pit was protected by the low-water cofferdam. The low-water cofferdam was designed with an instantaneous flow rate of 5% at this time of 7,830 M ~ 3 / C and the cofferdam top elevation was 97 meters. Weir beam narrow riverbed accounted for 58% of the width, according to the area ratio of 50%, beam narrow bed average velocity 4.46M / C. The main task of this stage is pumping clear base, building longitudinal concrete cofferdam (upstream and downstream 210M long 120M), the dam 18, and the upper and lower reaches of the horizontal high cofferdam. The second stage From June to October of 59, the foundation pit is protected by a high-water cofferdam. During this period, apart from continuing to increase the height