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Study on Mechanism of Rainwater Drinage in Thatched Roof and Aplication

茅草屋顶雨水排水机理研究及应用

基本信息

批准号：
04650515
负责人：
TANAKA Kyoji
金额：
$ 1.34万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650515/
关键词：
Roof Rainwater Waterproof Thatched roof Pitch Distance of rods Diameters of rods Number of layrs 草ぶき防雨勾配屋根材料径

项目摘要

The behavior of rainwater in a rod-thatched roof was investigaed to make clear the mechanism of water drainage of it. The apparatus that artificialy produces rainfalls was first develped for the research. Next, the abilities of drainage were measured for glass rod or stainless steel-rod thatches, which are used instead of a grass thatch, at various distances of rods, pitches and layrs. We finally tried to explain the drainage mechanism of rod-thatched roof systems through numerical simulation. The results obtained are as follows.(1) Behavior of rainwater in a roof can be explained from the two standpoints sicj as a fow along rods and penetration into a roof.(2) As for a flow along rods, We found out the two types of flow, namely, a steady continuous flow and an unsteady disconnected flow.(3) As for the water penetration into a roof, suitable distance of rods was found that holds water efficiently. This is the reason the hghestdrainage ability was observed at a particular distance of rods in a roof. Rainwater penetrates randomly falls down in gaps of beneath rods and it can be understood in terms of probabiities.(4) We proposed a two-dimensiona model of expressing the behavior of rainwater in a rod-thatch roof, and tried to simulate the behavior. Comparing to the test results, the model is considered to be available to describe quantitatively the behavior of rainwater in a rod-thatch roof.

研究了茅草屋顶雨水的特性，探讨了茅草屋顶雨水的排水机理。人工降雨的装置最初是为了这项研究而开发的。其次，测量了玻璃棒或不锈钢棒茅草的排水能力，这些茅草被用来代替草茅草，在不同距离的杆，间距和层。最后，我们试图通过数值模拟来解释杆茅草屋顶系统的排水机理。所得结果如下：(1)雨水在屋面中的行为可以从沿杆流动和渗入屋面两个角度来解释。(2)对于沿杆流动，我们发现了两种流动类型，即稳定的连续流动和不稳定的断开流动。(3)对于顶板渗水问题，找到了合适的杆距，可以有效地保持水分。这就是为什么在屋顶中特定距离的杆段上观察到最高的排水能力。雨水的渗透是随机的，雨水从杆下的缝隙中滴落下来，这可以用概率来理解。(4)提出了一种表达茅草屋顶雨水行为的二维模型，并对其进行了模拟。通过与试验结果的比较，认为该模型可以定量地描述雨水在茅草屋顶中的行为。