【正文】 計 ..................................................................................................................................... 6 毛管的允許水頭偏差 ..................................................................................................................... 6 毛管的極限孔數(shù)和極限長度 ........................................................................................................ 6 毛管的極限孔數(shù) Nm................................................................................................................ 6 毛管的極限長度 Lm ............................................................................................................... 7 4 管網(wǎng)布置與系統(tǒng)工作制度的確定 ....................................................................................................... 7 管網(wǎng)布置 .......................................................................................................................................... 7 毛管、支管布置 ...................................................................................................................... 7 分干管、主干管布置 .............................................................................................................. 7 系統(tǒng)工作制度設(shè)計 ......................................................................................................................... 7 各級管道的設(shè)計流量的確定 ........................................................................................................ 8 輪灌組數(shù)校核 ................................................................................................................................. 8 5 管網(wǎng)水力計算和支，干管管徑的確定 ............................................................................................... 9 毛管的水力計算 ............................................................................................................................. 9 毛管的水頭損失 hf 毛 ............................................................................................................... 9 毛管進口工作壓力 h0 毛 ....................................................................................................... 10 支管管徑的確定和水頭損失計算 ............................................................................................. 10 支管管徑的確定 .................................................................................................................... 10 支管水頭損失計算 ................................................................................................................ 11 穩(wěn)流三通的選擇與進口最低壓力的確定 .................................................................................. 11 調(diào)壓閥前最小工作水頭的確定 .................................................................................................. 11 干管管徑的確定和水頭損失計算 .............................................................................................. 12 甘肅農(nóng)業(yè)大學 07農(nóng)業(yè)水利工程 姜國軍 敦煌棉花膜下滴灌設(shè)計 2 干管管徑的確定 .................................................................................................................... 12 干管水頭損失計算 ............................................................................................................... 12 水錘壓力驗算與防護 .................................................................................................................. 15 6 首部樞紐設(shè)計 ....................................................................................................................................... 15 水泵與動力選型 ........................................................................................................................... 15 過濾器 ............................................................................................................................................ 16 施肥罐 ............................................................................................................................................ 16 控制量測設(shè)施與保護裝置 ........................................................................................................... 16 7 系統(tǒng)土建設(shè)計 ....................................................................................................................................... 16 8 工程投資概算 ....................................................................................................................................... 16 編制依據(jù) ........................................................................................................................................ 16 82編制方法 ......................................................................................................................................... 16 基礎(chǔ)單價 ................................................................................................................................ 16 其他費用 ................................................................................................................................ 17 單項工程投資指標 ....................................................................................................................... 17 工程投資估算 ............................................................................................................................... 18 工程資金籌措方式 ....................................................................................................................... 21 參考文獻： ..............................................................................................................................................