Test Study on Navigation in the First Construction Period of Lize Navigation-Power Junction

Based on the test results of Lize navigation-power junction construction diversion through the normal fix-bed model with the scale of 1:100, the navigation flow condition in each construction diversion period is studied. There are a lot of problems in the first construction diversion period, such as excessive flow velocity, poor flow pattern, low navigation discharge and so on. To solve these problems, the comprehensive engineering measures for improving the navigation flow condition during construction are put forward. Among them, the structure forms of construction diversion cofferdam are optimized. Finally, the highest safe navigation discharge and reasonable navigation route are proposed. The experimental results obtained from the optimization scheme of the first construction diversion period are better than these from the original scheme in terms of flow velocity, flow pattern and so on. The research results may serve as reference for similar engineering.

赣江石虎塘枢纽坝下水位下降试验研究

石虎塘枢纽是赣江中下游的第3个规划梯级,坝下沙质河床的水位变化不仅与冲刷下切有关,还与下游峡江枢纽的建设运行有关,需要论证坝下水位下降值,以确定船闸下引航道底板高程与电站装机高程.通过动床模型试验研究了坝下沿程水位的变化趋势与水位下降值.结果表明枢纽运行的前3年内水位下降幅度较大,运行9年后坝下水位下降最大约1.14 m,其后坝下水位下降趋缓,且水位下降值与下游峡江枢纽的建设运行时间有关,峡江枢纽运行后,坝下水位下降将很快趋缓,石虎塘与峡江两枢纽建设间隔时间越短、石虎塘枢纽坝下水位的下降越小.试验研究成果为枢纽设计提供了技术支撑,采用水位流量关系中心线确定工程前后同流量水位变化的方法具参考价值.

石虎塘航电枢纽工程电站取水口水流条件试验研究

通过水工模型试验,对赣江石虎塘航电枢纽[1]的电站取水口局部区域的水力、泥沙运动规律进行了研究,在确保电站无论在正常蓄水位情况还是在全闸敞泄情况下,电站均能够引用到足够的水量用以发电,在研究电站取水口原布置方案的基础上,对其布置形式进行了优化。试验表明,模型所提出的优化布置形式能够最大限度地满足电站取水发电要求,水流条件也平稳顺畅,避免了取水口处泥沙淤积而导致引水不畅问题,有利于电站取水口的安全、可靠运行,符合实际要求。

径流式电站厂房混凝土叠梁门临时封堵设计

钢筋混凝土叠梁门具有投资省、单节重量轻及对吊装设备能力要求不高等特点,因此常被用作径流式电站厂房进、出口临时封堵闸门。尽管钢筋混凝土叠梁门在水电站建设过程中属临时建筑工程,但它的安全运行直接影响到水电站机组的安装及电站按期投产发电,因此在工程建设中至关重要。本文结合江西赣江石虎塘航电枢纽工程实例,介绍该工程电站厂房进水口混凝土叠梁门临时封堵设计技术要点,供类似工程参考。