天气预报15天查询> 其他> 倒虹吸效应是什么意思

倒虹吸效应是什么意思

更新时间: 2020-09-26 00:00:00     

当渠道与道路或河沟高程接近,处于平面交叉时,需要修一构筑物,使水从路面或河沟下穿过,此构筑物通常叫做倒虹吸效应。倒虹吸主要有竖井式,这种形式施工简便而且便于清除泥沙。

早在2000多年前,中国已有成功的运用。与虹吸管一样,它在立面上也呈弓形,不同的是,其弓弯向下。而且,虽然倒虹吸管和虹吸管的输水原理相同,即都借助于上下游的水位差,但倒虹吸在开始工作时不需人为地制造管中的真空,因而更为普及。

关键词: 效应 什么 意思

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-144339/ | 耗时:0.0101 s | 内存:1.89 MB | 查询:5 | 缓存读取:4 写入:1 | 加载文件:23
SELECT ArticleID,Title FROM tbl_Articles where CategoryID=30000 ORDER BY ArticleID DESC LIMIT 10
select * from tbl_Articles WHERE ArticleID=144339 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=144339 LIMIT 0,1
select * from tbl_Articles_sphinx where id=144339 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1063619,1081241,1042020,1075859,1068880,2192331,2606672,1880459,2303533,1351255,1131947,1303695,1842311,2314945,1100115,1056832,1074799,1051435,1315493,1305178,1078428,1048622,1063735,1943061,1115087,1078100,1064345,1078797,1102710,1085458) ORDER BY field (ArticleID,1063619,1081241,1042020,1075859,1068880,2192331,2606672,1880459,2303533,1351255,1131947,1303695,1842311,2314945,1100115,1056832,1074799,1051435,1315493,1305178,1078428,1048622,1063735,1943061,1115087,1078100,1064345,1078797,1102710,1085458)