液压顶管在工程项目施工中的应用

介绍了液压顶管技术在地下管道施工中的应用,阐述了该技术的关键要求、施工要领以及验收规范,为更好的进行管道工程施工提出了见解.     

贮罐充气顶升倒装法机理与应用

介绍拱顶油罐的充气顶升倒装之施工方法，对充气所需风量、风压进行了分析。     

企业施工工法组讯

·山铝工程公司获评部级工法 由山东铝业工程有限公司研创的“锥底架空沉降槽地面倒装工法”经过多次施工应用，技术先进，方法成熟，简便快捷，经济效益显著，并通过中国有色金属建设协会专家评审。近日，被命名为2011年度中国有色金属建设行业部级工法，并在行业内推广应用。     

钢筋砼圆筒仓液压滑升模板施工技术总结

本文总结了液压滑升模板施工技术在单筒钢筋砼筒仓结构中的应用,介绍了圆筒仓滑模施工的构造特点、滑升工艺、安装要求以及作者的施工实践体会.     

基于液压系统的工程机械金属零件运行故障监测技术研究

我国对机械制品的需求量日益增大,基于此,本文引进了AMESim软件来绘制仿真模型来辅助液压技术对机械中的金属零件的监测工作。并就此设计了监测流程而且通过对比AMESim软件与传统草图技术证明了AMESim软件在液压系统监测技术中的强大的作用,即提升了之前液压技术的可靠性,从而增强了故障监测的工作效率。     

论矿山机械液压系统的故障及诊断

由于难以迅速发现矿山机械液压刺痛的故障及原因,需要对矿山机械液压系统常见故障及判断故障的方法进行分析。本文分析了矿山液压机械常见的故障,探讨了诊断故障的技术,以及进一步提升诊断故障的水平和质量。     

液压机械传动控制系统的应用分析

介绍了液压机械传动控制系统由执行机构、电源部件、辅助部件3部分组成,数控车床运行是液压机械传动控制系统的主要应用方向,在行业中要重视顶层设计,提升和完善技术标准,充分发挥无级变速技术,广泛地应用纯水液压机械传动控制系统.     

山东铝施工方法获部级工法

近日，山东铝业工程有限公司潜心研究的“种分槽搅拌装置倒装工法”被中国有色金属建设协会命名为中国有色金属建设行业部级工法。该工法经过多次施工应用，具有技术先进、方法成熟、简便快捷、经济效益明显等特点。目前，常规种分槽搅拌装置安装通行的简外组装整体吊装工艺存在占用场地大、使用大吨位吊车机械费用高、     

荣钢100t转炉本体设备倒装方法

荣钢扩建的100t转炉工程施工中,由于原建的2台转炉要正常生产,也未预留出新建转炉的平移空间,施工难度加大。根据现场的施工条件,为避免对建设单位正常生产的影响,采用倒装法将转炉本体设备的安装顺序进行了调整,炉壳采用制作简易横梁、精轧螺纹钢、精轧螺纹钢专用锚具和同步液压提升系统就位。顺利地完成了转炉本体设备的安装。     

液压滑移技术在大型电除尘器快速更新中的应用

结合宝钢一烧结电除尘器(ESP)更换的工程实例,将应用液压滑移这种机械设备安装新技术的施工工艺与常规施工工艺进行了对比。重点论述电除尘器滑移前施工要点如滑移台架搭设和旧ESP拆除,以及滑移过程中的设备选择、轨道导向和控制策略等。采用液压滑移技术更换大型电除尘器,可缩短施工工期,减小对连续生产的影响,简便快捷,安全可靠。     

Impulse Response Method for Pipeline Systems Equipped with Water Hammer Protection Devices

Surge protection devices, such as surge tanks and air chambers, have been modeled with the impulse response method for transient analysis of water distribution systems. The lumped inertia model and continuity equation are used to represent nonpipe hydraulic elements. Results of pressure or discharge variations obtained by using the impulse response method and the method of characteristics are in good agreement. The impulse response method provides total pressure and discharge along any pipeline segment by direct integration of the ratio of complex head or complex discharge to a complex downstream discharge, respectively. A modification is proposed so that transition between turbulent and laminar flows can be considered. The representation of hydraulic devices has been incorporated into the impedance matrix method, which was developed for heterogeneous and multilooped pipe network systems. The potential advantages of the proposed method over other conventional approaches were investigated by applying the proposed method to hypothetical pipe network systems.     

Use of Organoclay as Secondary Containment for Gasoline Storage Tanks

Conventional clay liners, which are widely used as hydraulic barriers to water, have been shown to be adversely affected by organic fluids. However, the addition of quaternary amines into bentonite greatly enhances its compatibility with organic fluids and thus allows the clay barrier technology to be extended to the treatment of organic contaminants. In this study, an organically modified clay was studied for use as a secondary containment for gasoline underground storage tanks. Free swelling and hydraulic conductivity tests were performed on organoclay, pure bentonite, and natural soils. Results show that organoclay has a large swelling capacity in gasoline, whereas bentonite and natural soils shrink when immersed in gasoline. The hydraulic conductivities of bentonite and natural soils to gasoline are 2–5 orders of magnitude higher than that to water. In contrast, the hydraulic conductivity decreases by 2 orders of magnitude for organoclay and this low value can be maintained even under freeze-thaw and dry-wet cycles.     

聚丙烯酸洗槽技术在冷轧生产的应用及展望

酸洗槽是去除热轧板表面氧化铁皮的主体设备,传统酸洗槽设计多选用碳钢衬胶再衬耐酸砖结构,制造工序复杂,维护困难。近年来,聚丙烯(PP)材质以其优越的机械加工性能和耐化学品性能得到广泛应用。对比PP酸洗槽和传统钢衬胶再衬砖结构,PP酸洗槽质量轻,便于运输、安装和质量控制,在越来越多的新旧生产线上取代传统的钢结构形式。分析PP酸洗槽设计方面纵向热膨胀以及回酸口的焊接问题,给出了解决的方案,并展望了PP酸洗槽的应用前景。     

正确解决“管网叠压”供水技术推广难题的途径

“管网叠压”供水技术目前正在大面积推广,但绝大多数管网叠压供水设备并没有发挥出应有的作用。原因是供水设备的运行方式不节能、不科学。实践证明：“管网叠压恒压水泵＋屋顶水箱”全自动供水设备是管网叠压供水技术推广的正确途径。     

Distribution of Discharge Intensity along Small-Diameter Collector Well Laterals in a Model Riverbed Filtration

Experiments were performed to evaluate flow and head variations along perforated screens (10–30?mm in diameter) using sand tanks which were connected and a perforated screen extended through these tanks to form a model collector well lateral up to 2.6?m in length. Hydraulic heads and discharge along the lateral and production rates of the model collector well were measured as the water level in the well, the lateral length, and diameter, and the hydraulic conductivity of the filter sand were varied. A mathematical model was developed to predict the axial flow velocity distribution and the discharge intensity variation along the lateral using the head distribution. Results showed that the production rate increased as the lateral length and diameter and the drawdown at the well increased. However, the production rate increase was not linearly related to these factors. When larger-diameter laterals were used, the axial flow velocity in the laterals decreased. This caused the hydraulic heads along the lateral to become more flattened, resulting in a lateral of high efficiency in terms of water production. This condition is similar to the assumption of the uniform discharge intensity along the lateral that many researchers have used in the analysis of the horizontal wells. Under the conditions of this study, a critical axial flow velocity was determined to be 1?m/s. Hydraulic efficiency decreased drastically when the velocity exceeded 1?m/s. The roughness coefficient (the Manning’s n value) of the lateral varied as a function of factors such as axial velocity and discharge intensity, and it ranged from 0.010 to 0.015.     

净水厂两种典型滤池设计应用解析

V型滤池和翻板型滤池是目前水厂净水工艺中两种技术较为先进的滤池,通过对这两种滤池的工艺过程、工艺特点、主要设计参数、自动化控制等方面进行比较分析了两种滤池各自的优缺点及适用范围。     

Hydraulic Modeling of a Mixed Water Level Control Hydromechanical Gate

This article describes the hydraulic behavior of a mixed water level control hydromechanical gate present in several irrigation canals. The automatic gate is termed “mixed” because it can hold either the upstream water level or the downstream water level constant according to the flow conditions. Such a complex behavior is obtained through a series of side tanks linked by orifices and weirs. No energy supply is needed in this regulation process. The mixed flow gate is analyzed and a mathematical model for its function is proposed, assuming the system is at equilibrium. The goal of the modeling was to better understand the mixed gate function and to help adjust their characteristics in the field or in a design process. The proposed model is analyzed and evaluated using real data collected on a canal in the south of France. The results show the ability of the model to reproduce the function of this complex hydromechanical system. The mathematical model is also implemented in software dedicated to hydraulic modeling of irrigation canals, which can be used to design and evaluate management strategies.     

Drinking Water Production from Well Water with High Sulfur and Sulfur Bacteria Content

Problems with treatment of Ahaste well water (Audru Parish, P?rnu County, Estonia) were studied in field conditions. The groundwater contains a significant amount of sulfur, from which at pH = 7.5–8.0 about 70–90% is in the form of hydrogen sulfide ion and 30–10% in the form of dissolved H2S. After aeration in the summer, this water formed an unknown slimy microbial mass with a distinct sulfuric odor, which clogged the aeration tanks, catalytic filters, and even the distribution network up to the consumers. After laboratory analyses, it was established that this unknown microbial mass is obviously the filiform sulfur bacteria Thiothrix, together with particles of free sulfur. It was found that this mass formed during enrichment under warm conditions using air as the oxidizer. Under these conditions, elemental sulfur was liberated and created favorable conditions for the Thiothrix to thrive using the elemental sulfur as their food source. A new treatment technology for this well water was developed using ozone as a strong oxidant/disinfectant, followed by filtration through an Everzit-Special, a material, which besides filtration, partially behaves as an adsorbent. The capital and operation costs of the new technology were estimated.     

环氧玻璃鳞片涂料在贮罐外壁防腐上的应用

阐述了焦化行业中贮罐主要腐蚀的原因，并介绍了玻璃鳞片衬里技术的发展、环氧玻璃氧片涂料的组成和在贮罐上的应用。     

Alternative Index for Interpretation of RTD Curves

An alternative approach for the interpretation of the residence time distribution (RTD) curves is proposed. The method has semiempirical basis, supported upon a gross fit of the tracer curve area by two triangles in order to obtain a single parameter (φ index) that indicates whether the system tends to a completely mixed or to a plug flow hydraulic behavior. In order to verify its applicability, 28 experiments were carried out in a laboratory tank (138 L). In these experiments, the influence of aeration, packing, and number of baffles on the tank hydraulic behavior was assessed using the index as well as conventional models. The general results obtained in the laboratory tank experiments showed that mixed tanks tend to have a larger dead volume fraction (DVF) than plug-flow tanks and that packed tanks tend to have a smaller DVF than nonpacked tanks. This index provides a reliable, quick, and simple method for the interpretation of the RTD curves when hydraulic behavior trends or tank modifications for hydraulic improvements are evaluated.