水工建筑新技术在左江水利枢纽工程中的应用

简介左江水利枢纽工程几种水工建筑新技术及应用情况 .①首次在左江干流大 (Ⅱ )型水利工程成功应用草土围堰技术 ,其渗透系数为 1× 10 - 5cm/s ,内外坡比 1∶1,抗冲流速 3～ 3 5m/s ,寿命可达 2a ;②采用水坡过坝建筑物 ,坡槽为钢筋混凝土“U”型断面 ,整体结构 ,全长 12 35m ,纵向坡率 3%,可比船闸方案减少投资 90 0万元 ;③在国内首次将消力戽应用于较低Fr数水流的较大工程 ,解决了低Fr数水跃摆动问题 ,且在较短的下游水流表面消除了波动 ,减轻了冲刷 ,提高了消能效果 ,经 5个洪水期的考验 ,运行情况良好 .

Application of New Hydraulic Construction Techniques to Zuojiang Water Conservancy Project

New hydraulic construction techniques and their application to the Zuojiang Water Conservancy Project are introduced as follows: ①the sward cofferdam technique is first successfully applied to the Zuojiang Project, the permeability coefficient of the cofferdam being 1×10 -5 ?cms, the ratio of the inner and outer gradient being 1∶1 , the resisting flow velocity being 3～3.5?ms, and the life-span being about 2 years; ②the water slope is a new dam crossing construction, the channel of the slope being a reinforced concrete structure with a "U" shape section, the length being 1?235?m, the vertical slope ratio being 3%, The present scheme can save 9 million Yuan as compared with the scheme in which a ship lock is adopted; ③for the first time in China, a deflector bucket is used in the large project with low Fr water flow, which helps solve the hydraulic jump under the condition of low Fr, eliminate the fluctuation of water surface on the short lower reach, alleviate the scouring caused by the fluctuation, and improve the effect of energy dissipation. After five flood periods' operation, the structure of the project is still in good condition.