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截流是大型水利水电枢纽施工中最关键的问题之一。解放后,我国兴建的大型水利枢纽全部采用了立堵法截流。近十年来,国外也愈来愈多的采用立堵法。其主要优点是:立堵法不需要浮桥设备和高度的机械化施工条件,并且比平堵法经济得多。实践证明,立堵法能适用于落差较大的情况,如盐锅峡Q=447米~3/秒,最大落差达4.43米就是成功的一例,而平堵法一般截流落差多在2.3米以下。
Closure is one of the most critical issues in the construction of large-scale water conservancy and hydropower projects. After the liberation, all the large-scale water conservancy hubs constructed in our country adopted the method of blocking legislation. In the past ten years, more and more foreign countries have adopted the legislation. Its main advantage is: legislation blocking method does not require pontoon equipment and a high degree of mechanized construction conditions, and more than the flat blocking method is much more economical. Practice has proved that legislation blocking method can be applied to a larger gap, such as salt pot Gorge Q = 447 m ~ 3 / s, the maximum drop of 4.43 meters is a successful example, .