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近年来,许多城市老旧排水管道由于各种原因,出现了不同程度的缺陷,如不采取有效措施,将会造成地下水渗漏、排水不畅、路面塌陷等一系列后果,有的甚至引发严重的的安全事故。在目前管道修复方法中,紫外光固化内衬修复技术是应用最广泛的一种方法。本文以福州市排水管网修复工程中采用的紫外光固化修复为例,介绍了紫外光固化内衬修复技术的施工过程,为紫外光固化修复技术在各大、中城市管网修复的推广和使用提供借鉴。 相似文献
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随着城市更新步伐的加快,非开挖技术大量应用于城市排水管道的修复工程。其中,原位固化法(CIPP)是近年来国内使用率越来越高的工法系统,其材料的供应商也从起初的几家德国企业发展到数十家国产材料供应商。因为该工法工艺的特殊性,材料的质量控制成为了使用该工法施工管道工程最终质量的关键。文中主要介绍原位固化修复材料的性能、德国修复材料的认证体系,以及国际标准ISO 11296-4中对原位固化法修复材料质量控制与验收的要求,以期为业主和相关单位提供质量保证的相关技术信息。通过欧洲机构和文中进行的相关测试数据分析结果,提出一些项目实践中亟待解决的问题,为以后的工作提供参考与借鉴。 相似文献
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《化学清洗》2012,(7):38-38
浆膜内衬法供排水管道修复工艺方法公开(公告)号:CNl02486247A公开(公告)日:2012.06.06发明(设计)人:杨兵摘要:一种浆膜内衬法供排水管道修复工艺方法,包括:(一)管道清淤清洗;(二)管道内窥视频检查;(三)制作工作坑;(四)内衬管焊接制作;(五)管道封堵导流调水;(六)待修管道内部预处理修复;(七)内衬管拉人待修管道;(八)内衬管两端封口及管件预埋;(九)向内衬管内部注水加压;(十)配浆和辅助真空注浆;(十一)保持内衬管内水压,待浆液固化后恢复通水;(十二)管道内窥录像记录修复后影像资料;(十三)前一至十二步骤修复施工按连续两个检查井为一个施工工作段,从紧邻工作坑检查井开始,向上下游依次施工,完成所有工作管段后,对工作坑中间铺设新管道,回土填埋压实后恢复路面;管道使用寿命长、通水流量高,施工速度快、污染少、对道路影响小。一种风电大型钢球硬磨液精密净化系统 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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利用组件技术开发化工原理实验课件,给出了系统层、组件库层和应用层的架构划分。重点讨论了组件库的设计,给出了流体阻力这一典型实验的实现描述。实践证实,基于组件技术可以提高仿真实验的开发效率。 相似文献