Studies on Applying Spiral Flow Type Channel to Develop Spiliways

管道一般建在坡度大于1/5的地区。然而，建造管道会导致诸如管道初始部分内的浮木或沙子堵塞、水流溢出和管道坍塌等问题。它是非常。为此，本研究开发了一种明渠结构，可在1/1坡度或弯道角度为90 °的区域内施工，这种流量控制方法是一种新开发的技术。通过将矩形渠道改造成圆形壁面渠道，可将高速水流的上升动能转化为螺旋流动能，使水流顺畅流动，可在坡度陡、渠道或斜槽弯曲的山区修建螺旋流型渠道结构技术。该方法适用于狭窄部位的溢洪道，也适用于大坝或水库的弧形溢洪道。目前，这种新型溢洪道仅在一个位置运行，当溢洪道堰宽与弧形断面渠道宽度相同时，水流控制较好，但当堰宽等于或大于弧形断面渠道宽度时，会造成溢流。因此，今后将研究将溢流堰的形状改进为曲折堰，使其宽度与渠道宽度相等，特别值得一提的是，这种新的螺旋式渠道结构可降低工程造价30- 40%。

A pipeline is usually constructed in the areas of where the slope is greater than 1/5. However, constructing pipelines results in problems such as blockage by driftwood or sand inside the initial portion of the pipeline, overflow of currents, and collapse of the pipeline. It is then very. difficult to remove the blockage.For these reasons, in this study an open channel structure was developed which can be constructed in areas with a 1/1 slope or when the curve angle of a channel is 90 degrees.This method of flow control is a newly developed technology. By altering the rectangular channel into a circular wall channel, the upward flow energy of high speed currents can be transformed into spiral flow energy, making the currents flow smoothly.It is possible to apply this technology of spiral flow type channel structure by constructing this system in mountains with steep slopes and curved channels or chutes. This method is practical in spillways located in narrow places, as well as in curved spillways of dams or reservoirs. At present, this new type spillway is in operation in one location.When the weir width of spillways is the same as the width of the arc section channel, flows can be controlled easily; but when the weir width is equal to or greater than the width of the channel, it causes overflows. Therefore, from now on studies on improving the shape of spillway weir to zigzag weir to make its width equal the width of the channel are planned on being carried out.Furthermore, it is worthy of special mention that this new spiral type channel structure can reduce the construction cost as much as 30-40%.