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结合南水北调中线京石段应急供水工程(委托河北建设管理项目)金属结构、机电项目管理特点,重点介绍了金属结构及机电设备制造安装管理体系和设备制造、安装全过程质量监控措施,对特大型水利工程的金属结构、机电项目管理经验进行了探索和总结,对类似工程的管理起到参考和借鉴作用. 相似文献
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抽水蓄能电站机电安装工程是一个多目标的复杂的系统工程,设备在安装过程中由于安装环节相对较多,并且经常会出现交叉作业的现象,在不同的安装阶段需要运用不同的安装技术,为更好保证机电安装工程安全、质量、进度目标的实现,需结合抽水蓄能电站工程实际特点机现场需求,制定符合本电站机电安装工程工期优化的方向和目标。对抽水蓄能电站机电设备安装技术管理进行探讨,在分析其安装要点和安装难点的基础上,具体论述抽水蓄能电站机电安装工程水轮机、发电机等环节的安装过程中的技术管理措施方法,希望能够为同业人员提供一定的借鉴参考。 相似文献
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随着我国的经济水平发展速度的不断提高,机电安装的技术也越来越高超,因此,建筑事业的发展空间也变得更大更广阔了。在工程施工的时候,机电设备的安装是施工质量是否达标的基础,因此,机电设备的安装管理必须得到加强,从而保证施工的质量。1.机电设备安装1.1机电安装特点随着经济水平的发展,我国的工业规模越来越大,机电安装也成了越来越大的工程,而建筑企业的机电安装工程尤为复杂,这类工程要求相关工作人员拥有较广的知识面,而安装者又必需要懂得新的技术,新的工艺以及新的设备的各种知识,总的来说,机电安装工程的技术含量相对较高,相关工作者应在施工的过程中不断学习,以提高自己的能力。 相似文献
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泸定水电站机电及金结设备安装工程的质量管理分为创优策划编制、质量保证和质量控制3个层次.机电安装的各级管理人员,包括监理工程师需在工程项目的实施过程中严格按照上述3个阶段进行,才能保证工程质量控制顺利有效的落到实处.并以电缆二次接线施工创优策划为实例加以说明. 相似文献
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介绍了为业主主导作用在大朝山工程机电项目管理中的体现,即从机电技术管理开始,到设备选厂、驻厂监造、进度计划管理、安装技术准备、监理单位的组建成套设备管理全过程中的体现,以及在进度控制,质量控制,费用控制等方面所取得的成效。 相似文献
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机电监理工作具有工程项目多、分布坝段广、专业覆盖面宽、进度受控于土建及设备供货等特点.结合三峡工程Ⅰ&ⅡB标机电一期埋件和设备安装工程的监理实践,对机电工程质量监理特性进行了分析总结.对设备开箱、材质检查、现场验收、安装调试等关键工序的监理工作或重点部位,提出了有效的控制程序.经监理严把质量关,严格执行验收和各项质量管理制度,确保了机电埋件和设备安装满足合同文件、设计图纸及规程规范要求,机电埋件安装合格率达到100%.泄洪坝段底孔弧门启闭机于2001年12月26日完成全部电气项目调试,单元工程评定为优良,2002年5月30日已正式移交给三峡电站筹备处. 相似文献
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机电安装项目管理是水电站建设工程的主要构成部分,其安装质量严重影响着工程总体质量,尽管我国已出台诸多相关政策与措施,但机电安装工程项目的质量问题依然偶有发生,直接影响着水电站的安全。对此,要从施工设计和组织协调等诸多方面提升管理水平,保证水电站的机电安装工程项目的总体建设质量,另外还应该积极应用先进信息化管理技术,创建水电站安装工程的管理信息化平台,提高建设效率,确保水电站工程项目的整体建设质量。 相似文献
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根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。 相似文献
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The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects. 相似文献
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In the lower River Murray, Australia, populations of gastropods have declined markedly over the past 40 years. Of the native fauna of about 18 species, only the ancylid Ferrissia petterdi remains common (but in patches), and another five species feature in sporadic local resurgences. Until recently the viviparid Notopala was thought to be extinct. The introduced physid Physa acuta is widespread, but in low numbers. The decline probably is associated with flow regulation, high turbidity and the introduction of common carp. Snail populations have persisted, however, in irrigation pipelines fed from the river, where they periodically cause blockages. This paper reports the discovery of the only known populaion of Notopala hanleyi in a pipeline where the inner wall accumulates microbial and other organic matter, providing high quality food for snails. In the Murray before regulation most of the periphytic biomass was probably microbial, as fluctuating water levels would have maintained littoral communities in a highly productive, early state of succession his postulated that, by stabilizing seasonal water levels, regulation has promoted the production of filamentous green algae, an inferior food source, and so displaced snail populations from the open aquatic environment. 相似文献
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V. K. Konovalov O. V. Yashkin V. V. Ermakov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2008,42(2):105-109
A system for removal and pneumatic transport of fly ash is examined, in which air pulses act on batches (pistons) of ash formed
in a duct. Studies are made of the effect of several physical parameters on the force required to displace a piston of ash
and these serve as a basis for choosing a system for removal and pneumatic transport of ash simultaneously from several hoppers
of an electric precipitator. This makes it possible to separate the ash particles according to size without introducing additional
components. Formulas are given for calculating the structural and dynamic parameters of this system and measurements of indirect
dynamic parameters are used to calculate the input-output characteristics of the system. In order to optimize the system,
configurations for summing several ducts into a single transport duct for pneumatic ash transport are proposed. Some variants
of dry ash utilization and the advantages of producing of size-separated particles are considered.
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Translated from élektricheskie Stantsii, No. 2, pp. 26–30 (2008). 相似文献
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Peter B. Bayley 《河流研究与利用》1991,6(2):75-86
The ‘flood pulse advantage’ is the amount by which fish yield per unit mean water area is increased by a natural, predictable flood pulse. Evidence for this increase is presented from tropical and temperate fisheries. It is argued that increasing multispecies fish yield by restoring the natural hydrological regime is consistent with increasing production of other trophic levels and with restoration from ecological and aesthetic viewpoints. When applied to a river-floodplain system, this restoration would provide a large, self-sustaining potential for recreation, commercial exploitation, and flood control. An interim ‘natural flood pulse’ restoration approach is proposed for systems modified for navigation. This approach approximates the natural hydrological regime in a river reach and is intended as a first step in the long process of restoring the watershed. 相似文献
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We tested the recolonization of the phytobenthic community in the tailwaters of Glen Canyon Dam following long- and short-term experimentally induced desiccation. The response of Cladophora glomerata, Oscillatoria spp., miscellaneous phytobenthos species and periphyton was studied over 18 weeks using three treatments: (1) undisturbed control cobbles from the submerged zone; (2) cobbles desiccated and replaced into the submerged zone; and (3) cobbles desiccated and replaced into the varial zone. Periphyton density and compositional response resulting from these treatments were also examined. Desiccation treatments were significantly different in biomass from controls throughout the study. The biomass of desiccated and replaced river cobbles averaged <30% of the controls for C. glomerata and periphyton during the 18-week recolonization period. In contrast, the biomass of the control Oscillatoria and miscellaneous phytobenthos species averaged only 3 and 50% of that in the desiccation treatments, respectively. Cladophora, the dominant alga, comprised 77% of the phytobenthic biomass. A significant positive relationship between discharge, Cladophora and periphyton biomass was present in all treatments, while there was a negative relationship with discharge for Oscillatoria and miscellaneous phytobenthos species. There was a significant inverse correlation, as well as a pattern of separate biomass dominance, between C. glomerata and Oscillatoria. Cladophora was the dominant phytobenthos species on cobbles below the baseflow and Oscillatoria was dominant on cobbles in the varial zone. In general, the Cladophora biomass decreased under intermittent drying conditions, while Oscillatoria declined under permanently wet conditions. Diatom composition was not significantly different between treatments; however, their density was lower on desiccated cobbles. Diatom density on desiccated cobbles in the submerged and varial zones averaged 69 and 42% of that of the controls, respectively. Recovery and maintenance of benthic resources are hindered by fluctuating flow regimes driven by electricity and irrigation requirements. Repeated desiccation of the phytobenthos has major effects on the bottom-up interactions in the Colorado River ecosystem. © 1998 John Wiley & Sons, Ltd. 相似文献