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pvc-u缠绕管在排水管网的应用是什么?

作者: laobingguandao    来源:http://www.laobingguandao.com  时间:2020-08-11    人气:
pvc-u缠绕管在给水排水管网是应用类比较全的管道网络系统,为便于规划、设计和运行管理,应将其简化和抽象为便于用图形和数据表达和分析的系统,称为给水排水管网模型。pvc-u缠绕管在管网模型中主要表达管网系统中各组成部分的拓扑关系和水力特性,将管网简化和抽象为管段和节点两类元素,并赋予工程属性。管网简化是从实际管网系统中删减一些比较次要的组成部分,使分析和计算集中于主要对象;管网抽象是忽略分析对象的一些具体特征,而将它们视为模型中的元素,只考虑它们的拓扑关系和水力特性。
PVC-U twined pipe is a pipe network system with complete application category in water supply and drainage network. In order to facilitate planning, design and operation management, it should be simplified and abstracted as a system that is easy to express and analyze with graphics and data, which is called water supply and drainage network model. In the pipe network model, PVC-U twined pipe mainly expresses the topological relationship and hydraulic characteristics of the components in the pipe network system. The pipe network is simplified and abstracted into two kinds of elements, pipe segment and node, and the engineering attribute is given. Pipe network simplification is to delete some minor components from the actual pipe network system, so that the analysis and calculation focus on the main object; pipe network abstraction is to ignore some specific characteristics of the analysis object, and treat them as elements in the model, only considering their topological relationship and hydraulic characteristics.
(1) pvc-u缠绕管网即对给水排水管网某些局部简化以后,要保持其功能、各元素之间的关系不变。宏观等效的原则是相对的,要根据应用的要求与目的不同来灵活掌握。
(1) PVC-U winding pipe network is to simplify some parts of water supply and drainage pipe network, and keep its function and the relationship between elements unchanged. The principle of macro equivalence is relative and should be grasped flexibly according to different requirements and purposes of application.
(2) pvc-u缠绕管网简化必然带来模型与实际系统的误差,需要将误差控制在一定的允许范围内,一般应要满足工程要求。
(2) The simplification of PVC-U winding pipe network will inevitably lead to the error between the model and the actual system. The error should be controlled within a certain allowable range, which should generally meet the engineering requirements.

pvc缠绕管网简化的一般方法(1)删除次要管线(如管径较小的支管、配水管、出户管等), 保留主干管线和干管线。当系统规模小或计算精度要求高时,可以将较小管径的管线定为干管线,当系统规模大或计算精度要求低时,可以将较大管径的管线定为次要管线。删除不影响全局水力特性的设施(如全开的闸阀、排气阀、泄水阀、消火栓等)。
The general method to simplify PVC winding pipe network is as follows: (1) to delete secondary pipelines (such as small diameter branch pipes, distribution pipes, outlet pipes, etc.) and retain the main pipelines and main pipelines. When the system scale is small or the calculation accuracy is high, the pipeline with smaller diameter can be regarded as the main pipeline; when the system scale is large or the calculation accuracy is low, the pipeline with larger diameter can be regarded as the secondary pipeline. Delete facilities that do not affect the overall hydraulic characteristics (such as full open gate valve, exhaust valve, drain valve, fire hydrant, etc.).
(2)当管线交叉点很近时,可以合并为同一交叉点;同一处的多个相同设施也可合并。(3)并联的管线可以简化为单管线,其直径采用水力等效原则计算。(4)将管线从全闭阀门处切断,但需保留调节阀、减压阀等。(5)在可能的情况下,将大系统拆分为多个小系统,分别进行分析计算。
(2) When the pipeline crossing point is very close, it can be merged into the same intersection point; multiple same facilities at the same place can also be merged. (3) The parallel pipeline can be simplified as a single pipeline, and its diameter is calculated by hydraulic equivalent principle. (4) Cut off the pipeline from the fully closed valve, but keep the regulating valve, pressure reducing valve, etc. (5) If possible, the large system is divided into several small systems for analysis and calculation.
pvc-u缠绕管经过简化的给水排水管网需要进一步抽象,使之成为仅由管段和节点两类元素组成的管网模型。在管网模型中,管段与节点相互关联,即管段的两端为节点,节点之间通过管段连通管段,管段是管线和泵站等简化后的抽象形式,它只能输送水量,管段中间不允许有流量输人置给水排水管网的简化。
The simplified water supply and drainage network of PVC-U winding pipe needs to be further abstracted to be a pipe network model composed of pipe segment and node only. In the pipe network model, pipe segments and nodes are interrelated, that is, the two ends of the pipe section are nodes, and the nodes connect the pipe sections through the pipe sections. The pipe section is the simplified abstract form of pipeline and pump station, which can only transport water, and there is no flow in the middle of the pipe section to simplify the water supply and drainage network.

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