【摘要】：隨著我國(guó)老舊城區(qū)供水管網(wǎng)工程的改擴(kuò)建需求,過(guò)去憑經(jīng)驗(yàn)進(jìn)行老舊城區(qū)供水管網(wǎng)的改擴(kuò)建在改造過(guò)程中在一定的盲目性,同時(shí)在經(jīng)濟(jì)上也造成一定的浪費(fèi)。在供水管網(wǎng)改擴(kuò)建過(guò)程中建立完善的安全風(fēng)險(xiǎn)評(píng)估體系,對(duì)于科學(xué)的確定管理方案,降低漏損、優(yōu)化供水管網(wǎng)布局,提高供水的安全性具有重要的指導(dǎo)意義。本文主要針對(duì)J市老舊城區(qū)供水管網(wǎng)建立安全風(fēng)險(xiǎn)評(píng)估體系,依據(jù)評(píng)估結(jié)果提出科學(xué)合理的優(yōu)化方案,指導(dǎo)管網(wǎng)的改擴(kuò)建。課題對(duì)J市老舊城區(qū)供水系統(tǒng)的現(xiàn)狀進(jìn)行了調(diào)研,累計(jì)調(diào)查管道27公里,管材主要包括球磨鑄鐵管、灰口鑄鐵管、UPVC管、PE管,供水管道管徑主要分布在200~700mm之間。調(diào)查二次供水系統(tǒng)共19處,主要包括二次供水的內(nèi)網(wǎng)、外網(wǎng),二次供水設(shè)備等。結(jié)果表明供水管網(wǎng)年久失修、管網(wǎng)實(shí)際運(yùn)行狀態(tài)不佳,二次供水系統(tǒng)內(nèi)、外網(wǎng)管道老化嚴(yán)重、二次供水設(shè)備老化、地溝內(nèi)的排水管道和供水管道存在跑、冒、滴、漏等現(xiàn)象。說(shuō)明該市老舊城區(qū)供水管網(wǎng)存在安全風(fēng)險(xiǎn)評(píng)估的必要性。建立了J市老舊城區(qū)供水管網(wǎng)的水力和水質(zhì)風(fēng)險(xiǎn)評(píng)估體系。運(yùn)用InfoWorks WS軟件中的重要管段分析模塊,對(duì)供水管段進(jìn)行測(cè)試,根據(jù)受重要管段影響的實(shí)際壓力變化、節(jié)點(diǎn)數(shù)、低于最小壓力的節(jié)點(diǎn)數(shù)、高于最大壓力的節(jié)點(diǎn)數(shù)、下閾值壓力變化、上閾值壓力變化六個(gè)因素,確定風(fēng)險(xiǎn)管段,并初步將這些管段的所在區(qū)域確定為改造區(qū)域;水質(zhì)風(fēng)險(xiǎn)評(píng)估是選取7個(gè)二次供水水質(zhì)監(jiān)測(cè)點(diǎn)與7個(gè)市政管網(wǎng)水質(zhì)監(jiān)測(cè)點(diǎn)建立監(jiān)測(cè)系統(tǒng),將水質(zhì)監(jiān)測(cè)點(diǎn)檢測(cè)結(jié)果進(jìn)行比較,并建立J市二次供水水質(zhì)模型,對(duì)二次供水水質(zhì)(余氯)變化情況進(jìn)行模擬,結(jié)果可見(jiàn)用戶的出水水質(zhì)受到二次供水系統(tǒng)污染,結(jié)合調(diào)研結(jié)果初步確定二次供水系統(tǒng)改造區(qū)域。對(duì)J市老舊城區(qū)供水管網(wǎng)改擴(kuò)建和二次供水改造工程實(shí)例進(jìn)行應(yīng)用研究。對(duì)老舊城區(qū)供水管網(wǎng)的區(qū)塊化技術(shù)進(jìn)行研究,結(jié)合水力風(fēng)險(xiǎn)評(píng)估的結(jié)果,用壓力分區(qū)的方法對(duì)供水管網(wǎng)進(jìn)行分區(qū),并結(jié)合各區(qū)域的實(shí)際情況分析造成該區(qū)域管道高壓或低壓的原因,給出相應(yīng)的對(duì)策;對(duì)二次供水系統(tǒng)的優(yōu)化改造技術(shù)進(jìn)行研究,對(duì)通過(guò)水質(zhì)風(fēng)險(xiǎn)評(píng)估確定的12個(gè)二次供水系統(tǒng)改造區(qū)域進(jìn)行二次供水外網(wǎng)、內(nèi)網(wǎng)改造、撤并地勢(shì)高區(qū)二次供水設(shè)施、整合高層小區(qū)二次供水設(shè)施、增設(shè)二次供水設(shè)施解決水壓不足區(qū)域、安裝在線監(jiān)測(cè)系統(tǒng)、水表出戶改造。整體改造后該市的供水系統(tǒng)運(yùn)行狀態(tài)良好,在保障水質(zhì)安全的前提下,達(dá)到了平衡水壓,降低管網(wǎng)漏失率,節(jié)約能耗的目的。
[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.
【學(xué)位授予單位】：吉林建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU991.33

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