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在钻孔遇漏失量大、不稳定地层时,采用气举反循环钻进工艺,可解决正循环钻进无法施工的难题。利用气举反循环工艺洗井相比传统活塞式洗井工艺,具有效率高、事故少、施工成本低和施工质量好等优势。文中通过气举反循环工艺原理,在不下抽水泵的情况下实现了超深井孔底抽水的目的。正、反循环钻进技术联合使用,是优质、高效开发深部地热井和地下水资源的有效方法。 相似文献
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本文针对反循环回转钻进施工工艺,结合正、反循环工程实践,分析对比了砼灌注桩反循环与正循环施工工艺的特点,得到了一些有用的结论,对指导类似工程施工具有重要的应用价值。 相似文献
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分析探讨了空气洗井各个参数的计算公式,对干空气反循环洗井钻进过程中压强损失计算进行了研究,从而得.到整个洗井过程压强损失总量,进一步确定了干空气洗井钻进所需要的冲洗压强,为洗井工程提供一定的理论依据。 相似文献
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一、反循环与正循环工艺的基本区别钻孔灌注桩反循环施工工艺恰恰是把正循环的工艺颠倒过来,把输进泥浆泵管作为输出(吸出)泥浆,把溢出(压力作用下上浮)泥浆改为输入(自动流入)泥浆,其设备基本与正循环相仿。二、反循环工艺施工的优点按反循环工艺施工,泥浆泵管与钻杆上部接通,通过钻杆中心的孔,作为吸出泥浆,再把吸出泥浆通过泥浆池自动返回孔壁流入,因此形成了以下几个优点: (1)泥浆造壁合理由于泥浆比重控制在1.05-1.10,流动淌入自由,失水率保持基本平衡,护壁厚度相对较薄,增强了混凝土表面与土壤的摩擦系数。 相似文献
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目前,泥浆护壁成孔超长混凝土灌注桩已广泛应用于基础工程领域,其长度愈来愈长,承载力要求也愈来愈大,加大了施工难度,常会引发一些质量问题。本文叙述其质量通病防治方法。1泥浆护壁成孔中的质量通病防治1.1地基土层硬性夹杂物欲将孔内硬性夹杂物排净,可采用带砂石泵和泥浆泵的工程钻机正循环成孔,分阶段反循环排渣,既避免了正循环不易将硬性杂物携带出孔、反循环易塌孔的缺点,又充分利用了正循环不易塌孔、反循环易吸出硬性杂物的优点,保证了桩的沉降量、承载力满足设计要求。1.2桩孔缩径开工前应通过地质报告掌握淤泥层距桩孔口的… 相似文献
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《Planning》2014,(9):49-50
注水井洗井能够减少水井测试遇阻,降低注水压力,节约能耗,是井筒净化的有效方式。选择高压泵车洗井为主、循环洗井车为辅的洗井方式,解决了泵车洗井存在的车组数量多、路途较远、废液处理能力不足等问题,采用注水井循环洗井技术可减少洗井液量,降低环境污染,缓解废液处理压力。循环洗井车适用于进出口水量基本平衡,洗过2~3次,井况清楚的井。 相似文献
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液压系统配管的质量直接影响液压系统的可靠性,其中通过管道循环冲洗工作保证系统清洁度非常关键。详细介绍了液压系统循环冲洗的施工方法及施工要点,重点介绍了冲洗回路的连接方式。 相似文献
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In recent years experimental investigations regarding enhanced remediation of contaminated aquifers by employing vertical circulation flow systems were carried out at the Institute for Hydromechanics (IfH), University of Karlsruhe. These investigations were focused on large scale three-dimensional remediation experiments with a groundwater circulation well (GZB) at field-like conditions in the research facility VEGAS, University of Stuttgart. Small scale laboratory experiments in columns and a two-dimensional flume at the IfH as well as field experiments completed the multiple-scale investigations. The experimental results on different scales showed the dominance of the mass transfer processes on the in situ remediation of a contamination source and their dependence on the flushing intensity. The remediation progress could be explained and also predicted by the mass removal coefficient. The GZB is a robust and well controllable technology, whose operation could be adapted well to natural aquifer conditions and the physical-chemical properties of the contaminants. Developing different efficiency numbers results of the experiments and generally remediation variants could be evaluated due to their effect and expenditure. 相似文献
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基于冷弯薄壁轻型钢结构住宅构造特征研发了一种具有呼吸功能的节能环保双层空气循环系统,运用Fluent、Airpak软件三维数值模拟探讨该系统对室内热环境的影响机理。考察空气循环系统各个组件在运行过程中速度场、温度场、PPD-PMV分布等各项指标特性及影响因素,据此对室内气流组织及空气品质进行评价。研究表明,空气缓冲层能为内、外空气层提供良好空气源;外空气层利用烟囱效应能动态地隔绝室内外热量;整个双层空气循环系统能够在较低能耗的前提下,改善室内热环境,为室内居住者24 h提供新鲜空气,达到节能环保的目的。 相似文献
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There are many concerns over the environmental consequences of river regulation in China, such as the Three Gorges Project and the South-to-North Water Diversion Project (SNWDP). In this study, however, we attempted to find the positive role of these constructions in solving environmental problems. We explored the possibility for preventing downstream diatom blooms by using the water storage in the Danjiangkou Reservoir. And we developed a flushing strategy accessing the proper flushing time and water quantity to control the diatom growth. First, we set up a Generalized Additive Model (GAM) to analyze the dynamics of the bloom-formation species, Stephanodiscus hantzschii, in response to the environmental variation. The model took into account the time lags between the biovolume and the environmental parameters. The model indicated that, air temperature explained the most variance in biovolume, followed by soluble reactive silicon (SRSi), turbidity, TP, dam release, PAR, pH and total nitrogen (GAM, R2 = 0.759). Afterwards, we applied the model to a new predictive dataset, in which values were simulated according to the assumed dam release and air temperature. The GAM predicted fewer releases for flushing by using this dataset than the measured data, implying a prospect of saving water when using this strategy. Finally, we drew a contour map to present the operating procedure of this strategy. Our flushing strategy is to regulate the dam release above a critical value dependent on the air temperatures predicted over the following few days. 相似文献
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总结了大型集中空调水系统调试过程中需要注意和解决的几个问题,对传统大管径空调水系统冲洗方法提出了质疑,对调试过程中的水流量分配提出了自己的观点,希望为大型集中空调水系统的调试提供一种新的思路和方法. 相似文献
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煤层的瓦斯抽采是避免煤矿瓦斯灾害发生的根本防治措施。根据瓦斯解吸理论,提出通过水力割缝及水力冲孔技术,在煤体中人为再造裂隙,增大煤体在空气中的暴露面积,同时形成瓦斯流动通道,达到加快瓦斯解吸,提高瓦斯抽放效果的目的。本文以水力割缝及水力冲孔进行机理分析为基础,根据在阳泉矿区某煤矿回风巷中进行现场实验,对普通钻孔抽放瓦斯、水力冲孔抽放瓦斯以及高压水力割缝抽放瓦斯三种方案进行比较。实验结果表明,相对于高瓦斯矿井中通常采用的普通钻孔抽放瓦斯,水力割缝技术瓦斯抽放量提高了4.11-4.34倍,水力冲孔技术瓦斯抽放量提高了0.46-0.56倍。水力冲孔对提高瓦斯抽放速度作用不明显。 相似文献