共查询到11条相似文献,搜索用时 46 毫秒
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摘要:管桩新生产线采用泵机输送混凝土,要求混凝土具有较大流动性和良好的保塑性,这些要求常规聚羧酸母液无法胜任,需要研发一种缓释型聚羧酸减水剂(以下简称H1)。它是以小单体丙烯酸和甲基烯丙醇聚氧乙烯醚为原料,采用氧化还原引发体系聚合,通过丙烯酸甲酯调整排列,通过蠕动泵来控制反应速度。考察减水剂合成过程中引发剂用量、反应温度、单体的摩尔比、链转移剂用量对减水剂分散性能的影响,并考察H1在管桩新生产线中的实际使用质量指标对比。 相似文献
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在南水北调万年闸泵站的建设过程中,混凝土的防裂是施工中突出的技术难题。在缺乏类似工程施工经验的前提下,本人对混凝土浇筑常规的温控措施加以完善,并应用到万年闸泵站工程中,取得了很好的应用效果。 相似文献
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砂石料是水利水电建设工程的主要建筑材料。砂石料单价确定是否合理直接影响到工程的造价和效益。作者结合引洮工程的砂石料料场选择和各料场砂石料综合单价的计算,对影响大型引水工程投资较大的砂石料料源的选择、加工、运输等费用进行分析,进而为更好的控制和管理工程造价提供意见和建议。 相似文献
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宝鸡市长距离引、输水管线的运行管理 总被引:2,自引:1,他引:2
介绍了宝鸡市冯家山给水工程中引、输水管线的运行管理方法。实践表明,自与宝鸡市区的管网并网半年以来,因运行管理方法得当而未出现爆管事故。 相似文献
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Influence of the South-North Water Diversion Project and the mitigation projects on the water quality of Han River 总被引:1,自引:0,他引:1
Situated in the central part of China, the Han River Basin is undergoing rapid social and economic development with some human interventions to be made soon which will profoundly influence the water environment of the basin. The integrated MIKE 11 model system comprising of a rainfall-runoff model (NAM), a non-point load evaluation model (LOAD), a hydrodynamic model (MIKE 11 HD) and a water quality model (ECOLab) was applied to investigate the impact of the Middle Route of the South-North Water Diversion Project on the Han River and the effectiveness of the 2 proposed mitigation projects, the 22 wastewater treatment plants (WWTPs) and the Yangtze-Han Water Diversion Project. The study concludes that business as usual will lead to a continuing rapid deterioration of the water quality of the Han River. Implementation of the Middle Route of the South-North Water Diversion Project in 2010 will bring disastrous consequence in the form of the remarkably elevated pollution level and high risk of algae bloom in the middle and lower reaches. The proposed WWTPs will merely lower the pollution level in the reach by around 10%, while the Yangtze-Han Water Diversion Project can significantly improve the water quality in the downstream 200-km reach. The results reveal that serious water quality problem will emerge in the middle reach between Xiangfan and Qianjiang in the future. Implementation of the South-North Water Diversion Project (phase II) in 2030 will further exacerbate the problem. In order to effectively improve the water quality of the Han River, it is suggested that nutrient removal processes should be adopted in the proposed WWTPs, and the pollution load from the non-point sources, especially the load from the upstream Henan Province, should be effectively controlled. 相似文献
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针对南水北调东线水引入胶东供水后水源水中有机碳的变化进行了分析,发现2016年以来水源水中有机碳含量显著升高,平均值在5 mg/L以上,有机碳含量的升高造成水中存在异嗅味、消毒副产物浓度升高、水质生物稳定性变差等问题。为了解目前水厂工艺对生物可同化有机碳(AOC)的去除作用和管网水质的生物稳定性状况,以某水厂为研究对象,分析了2019年2月水厂处理工艺各单元出水中TOC含量、有机碳的分子质量分布和AOC含量。结果表明,水厂处理工艺对TOC的去除率为23. 9%,出厂水中TOC含量较高。水厂原水主要以分子质量<0. 5 ku和3~5 ku的有机碳为主,各工艺段出水中不同分子质量有机碳对总溶解性有机碳的相对贡献变化不大。水厂原水AOC含量为322. 36μg/L,AOC-P17占总AOC的66. 1%,水处理工艺对AOC的总去除率为46. 1%,AOC-P17的去除率高于AOC-NOX的去除率。 相似文献
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南水北调工程中线鹤壁段II标渠道的防水密封,除在设计上采用了特殊的柔性结构外,还采用了性能优异的聚硫密封胶填缝,使整个结构形成一个柔性防水系统,工程的防水密封效果良好。 相似文献