老旧城区供水管网基于风险评估的改扩建技术研究

发布时间：2018-07-17 06:36

【摘要】：随着我国老旧城区供水管网工程的改扩建需求,过去凭经验进行老旧城区供水管网的改扩建在改造过程中在一定的盲目性,同时在经济上也造成一定的浪费。在供水管网改扩建过程中建立完善的安全风险评估体系,对于科学的确定管理方案,降低漏损、优化供水管网布局,提高供水的安全性具有重要的指导意义。本文主要针对J市老旧城区供水管网建立安全风险评估体系,依据评估结果提出科学合理的优化方案,指导管网的改扩建。课题对J市老旧城区供水系统的现状进行了调研,累计调查管道27公里,管材主要包括球磨铸铁管、灰口铸铁管、UPVC管、PE管,供水管道管径主要分布在200~700mm之间。调查二次供水系统共19处,主要包括二次供水的内网、外网,二次供水设备等。结果表明供水管网年久失修、管网实际运行状态不佳,二次供水系统内、外网管道老化严重、二次供水设备老化、地沟内的排水管道和供水管道存在跑、冒、滴、漏等现象。说明该市老旧城区供水管网存在安全风险评估的必要性。建立了J市老旧城区供水管网的水力和水质风险评估体系。运用InfoWorks WS软件中的重要管段分析模块,对供水管段进行测试,根据受重要管段影响的实际压力变化、节点数、低于最小压力的节点数、高于最大压力的节点数、下阈值压力变化、上阈值压力变化六个因素,确定风险管段,并初步将这些管段的所在区域确定为改造区域;水质风险评估是选取7个二次供水水质监测点与7个市政管网水质监测点建立监测系统,将水质监测点检测结果进行比较,并建立J市二次供水水质模型,对二次供水水质(余氯)变化情况进行模拟,结果可见用户的出水水质受到二次供水系统污染,结合调研结果初步确定二次供水系统改造区域。对J市老旧城区供水管网改扩建和二次供水改造工程实例进行应用研究。对老旧城区供水管网的区块化技术进行研究,结合水力风险评估的结果,用压力分区的方法对供水管网进行分区,并结合各区域的实际情况分析造成该区域管道高压或低压的原因,给出相应的对策;对二次供水系统的优化改造技术进行研究,对通过水质风险评估确定的12个二次供水系统改造区域进行二次供水外网、内网改造、撤并地势高区二次供水设施、整合高层小区二次供水设施、增设二次供水设施解决水压不足区域、安装在线监测系统、水表出户改造。整体改造后该市的供水系统运行状态良好,在保障水质安全的前提下,达到了平衡水压,降低管网漏失率,节约能耗的目的。
[Abstract]:With the demand of water supply network engineering in old urban area of our country, the reconstruction and extension of water supply network in old urban area in the past has been carried out with certain blindness in the process of reconstruction, and at the same time, it has caused a certain amount of waste in economy. The establishment of a perfect safety risk assessment system in the process of water supply network reconstruction and extension has important guiding significance for the scientific determination of management scheme, the reduction of leakage, the optimization of the distribution of water supply network and the improvement of the safety of water supply. In this paper, a safety risk assessment system is established for the old urban water supply network in J city. Based on the evaluation results, a scientific and reasonable optimization scheme is put forward to guide the reconstruction and expansion of the pipe network. The present situation of water supply system in old urban area of J city is investigated. The total investigation pipe is 27 kilometers. The pipe material mainly includes ball cast iron pipe, gray cast iron pipe, UPVC pipe and PE pipe, and the diameter of water supply pipe is mainly distributed between 200~700mm. A total of 19 secondary water supply systems were investigated, including the intranet, outer net, secondary water supply equipment and so on. The results show that the water supply network is out of repair, the actual operation of the pipe network is not good, in the secondary water supply system, the external network pipeline is aging seriously, the secondary water supply equipment is aging, the drainage pipe and the water supply pipe in the gutter are running, dropping, leaking and so on. It is necessary to evaluate the safety risk of the water supply network in the old urban area of the city. The hydraulic and water quality risk assessment system of the old urban water supply network in J city was established. Using the important pipe segment analysis module in InfoWorks software, the paper tests the supply pipe section. According to the actual pressure change affected by the important pipe segment, the number of nodes is lower than the minimum pressure, and the number of nodes is higher than the maximum pressure. The change of the lower threshold pressure and the change of the upper threshold pressure are six factors to determine the risk section, and the region where these segments are located is preliminarily determined as the modification area. Water quality risk assessment is to select 7 secondary water quality monitoring points and 7 municipal pipe network water quality monitoring points to set up a monitoring system. The results of water quality monitoring points are compared, and a water quality model of secondary water supply in J city is established. The change of water quality (residual chlorine) of secondary water supply is simulated. The result shows that the effluent quality of the user is polluted by the secondary water supply system, and the reconstruction area of the secondary water supply system is preliminarily determined in combination with the investigation results. An application study on the reconstruction and extension of the old urban water supply network and the project of secondary water supply in J city is carried out. In this paper, the blockization technology of old urban water supply network is studied. Combined with the result of hydraulic risk assessment, the water supply network is partitioned by the method of pressure partition. Combined with the actual situation of each region, the causes of high pressure or low pressure of pipeline in this area are analyzed, and the corresponding countermeasures are given, and the optimization and reconstruction technology of secondary water supply system is studied. For 12 secondary water supply system reconstruction areas determined by water quality risk assessment, the secondary water supply outer network, the inner network reconstruction, the secondary water supply facilities in the high terrain area are removed, and the secondary water supply facilities in the high level residential area are integrated. Add secondary water supply facilities to solve the area of water pressure shortage, install online monitoring system, water meter renovation. The water supply system of the city is in good condition after the whole reformation. On the premise of ensuring the safety of water quality, the water pressure is balanced, the leakage rate of the pipe network is reduced, and the energy consumption is saved.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU991.33

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