In this paper the function , installation of counter flow preventor and resulted changes in the pipeline layout are described 介紹了倒流防止器的功能及其安裝方式,并對隨之導致的供水管網圖式變化作了詳細闡述。
More space - effective : the outlet is available for three directions , leftwards , rightwards and upwards , easy for pipeline layout and installation and space - effective 占地更省:出口可向左、向右、向上三個方向,便于管道布置安裝,節省空間。
Article 40 the project owners shall provide the construction enterprises with the documents concerning underground pipeline layout related to the construction site and the construction enterprises shall take preventive measures 第四十條建設單位應當向建筑施工企業提供與施工現場相關的地下管線資料,建筑施工企業應當采取措施加以保護。
Aimed at the current problem of pipeline layout optimization technique , the research of irrigation pipeline layout and pipe diameter optimization has been done , the gis ( geography information system ) and graph theory were first put forwarded to applyed to the design of low pressure pipeline irrigation project in the paper . with the support of gis , the minimal spanning tree theory of graph theory and 120 project theory can be applied to irrigation pipeline ' s layout optimization . at the aspect of pipe diameter optimization , simplicial method and interior - point method are been used in solve liner optimization model of pipe diameter to reach minimum project cost or a nnual working cost of low pressure pipeline irrigation 本文主要針對當前南方地區低壓管道輸水灌溉規劃設計中存在的技術難點,開發研究先進實用的樹狀低壓輸水灌溉管網計算機輔助設計系統。首次提出了將gis (地理信息系統)和圖論技術應用于低壓管道輸水灌溉規劃設計及灌溉管網優化中,在gis支持環境下,應用圖論中的最小生成樹法和120規劃進行管道的最優化布置。建立以管道輸水灌溉系統的年折算費用最小為目標函數的管徑優化線性規劃模型,并將內點法應用于線性優化模型的求解。
The function of the software is useful , it has provided many functions such as the calculate of crop water requirement , pipeline layout ( automatic layout and manual operation ) and its optimization , pipe diameter optimization . investment budgetary estimate and economic beneficial result can be result . and can rapid create plan and do plan comparison , the software provides many kinds of result output such as graph . text , table and so on 該系統可以實行作物需水量計算,系統設計流量推算、管道水力計算、工程投資概算,經濟效益分析等功能,建立了常用的數據庫(管材、管件、水泵和電機等)并對其進行管理和維護,可以實現包括管道布置、管徑優化、管材選擇等多種參數選擇在內的多種方案比較、優選。系統能提供圖形、文本、表格等多種形式的成果輸出,人機交互界面友好,操作方便。