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谁知道倒虹吸管设计的计算方式是什么?_其他_设计456问答
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谁知道倒虹吸管设计的计算方式是什么?

浏览:44次 | 提问时间: 07-29 05:49
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3个答案
葵屿 07-29 05:49

根据管路埋设情况及高差大小,倒虹吸管有下列几种布置形式:对高差不大的小倒虹吸管,常采用斜管式和竖井式。高差大的倒虹吸管,当跨越干谷或山沟时,管道一般沿地面敷设,在转弯和变坡地段设置镇墩,其作用是连接和稳定两侧管道。管道可埋设于地面以下,也可敷设于地面或在管身上填土。当管道跨越深谷或山洪沟时,可在深槽部分建桥,在其上铺设管道过河。管道在桥头两端山坡转弯处设镇墩,倒虹吸管倒虹吸管并于其上开设放水冲沙孔。*管道仍沿地面敷设。这类倒虹吸管又称桥式倒虹吸管。根据过水流量大小、运用要求及经济比较,倒虹吸管可布置成*、*或多管。设置*或多管,可以*流检修,不影响运行;小流量时,还可利用部分管路过水,以增加管内流速,防止泥沙在管中淤积。管身断面形式有圆形、矩形及城门洞形等,其中圆形采用较多。

沼桉 07-29 05:58

1倒虹吸管设计计算一、倒虹吸管总体布置(根据地形和当地需水量情况确定)1.布置原则;13P2.布置型式;{地面式(露天或浅埋式)、架空式}3.管路布置;(斜管式和竖井式)4.进口段布置;{渐变段、拦污栅、节制闸、连接段﹙进水口、通汽孔﹚、沉沙、冲沙及泄水设施}5.出口段布置;(设消力池)二、倒虹吸管的构造1.管身构造;(钢筋混泥土管、钢管、铸铁管)2.支承结构;(管座、镇墩、支墩)三、倒虹吸管的水力计算1.管道断面尺寸的确定;①灌溉面积的确定:(根据土地利用参加够调整表查出整理后土地的灌溉面积。)②补水量的计算:项目区水田和旱地需水量除去项目区降雨量即为需补给水量。项目区分为水田和旱地,主要农作物为水稻、玉米、油菜,各种农作物所在区需水量不同。根据贵州省《灌溉用水定额》编制分区图:项目区属Ⅰ区,灌溉定额根据贵州省灌溉用水定额编制Ⅰ区水稻净定额为2703m/亩,毛灌溉定额为6443m/亩。2需水量公式WMAn毛需W需——农业生产总需水量,3m;M毛——综合毛灌溉定额,3m;A——灌溉面积,亩;n——农作物复种指数,采用综合灌溉定额时,已经考虑了复种指数,可不再计入。MM净毛M净——作物净灌溉定额,3m/亩;——灌溉水利用系数。Ⅰ区渠系水利系数为0.465;田间水利用系数为0.95,故灌溉水利用系数为0.465×0.95得0.44。

じ小奋斗为你弃心 07-29 06:06

.布置原则;13P2.布置型式;{地面式(露天或浅埋式)、架空式}3.管路布置;(斜管式和竖井式)4.进口段布置;{渐变段、拦污栅、节制闸、连接段﹙进水口、通汽孔﹚、沉沙、冲沙及泄水设施}5.出口段布置;(设消力池)二、倒虹吸管的构造1.管身构造;(钢筋混泥土管、钢管、铸铁管)2.支承结构;(管座、镇墩、支墩)三、倒虹吸管的水力计算1.管道断面尺寸的确定;①灌溉面积的确定:(根据土地利用参加够调整表查出整理后土地的灌溉面积。)②补水量的计算:

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