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近年来,随着水利事业的发展,田间毛、顺两级渠道推行混凝土U形衬砌进展较快,效益显著。但在U形渠槽上安设巴歇尔量水堰、无喉量水堰或梯形量水堰等固定量水设施须修一段梯形渠槽作为整流渐近段。由于两种渠槽断面形状、面积相差悬殊,往往在堰上游喇叭口容易淤积;在堰下游断面变小后又易拥高水位,使过堰水流成为潜流,计算流量较繁。为了解决上述问题,现介绍一种圆孔薄壁堰,该堰具有结构简单,便于施工,用料少的特点,经我们近年使
In recent years, along with the development of water conservancy, the progress of the implementation of concrete U-shaped lining in the fields of fur and canal along the two channels has made rapid progress with significant benefits. However, a set of trapezoid channels shall be repaired as a rectification asymptote by installing a Parshall weir on the U-shaped channel and a fixed quantity of water facilities such as non-throat weirs or trapezoidal weirs. Due to the difference in shape and area of the two flume sections, tendons tend to accumulate in the upper flare of the weir. After the section of the lower reaches of the weir becomes smaller, the height of the flume tends to be high, which makes the weir flow into an undercurrent and the calculation flow is complicated. In order to solve the above problems, we present a circular hole thin-walled weir, the weir has a simple structure, ease of construction, with less material characteristics, by our in recent years