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王远旺 《河北水利水电技术》2011,(4):39-41
云州水库除险加固工程金属结构部分根据闸门和启闭机目前存在的问题进行了改建设计。对泄洪洞进口事故闸门卷扬启闭机和发电输水洞进口事故闸门卷扬启闭机进行了更新,启闭机容量和扬程均较大。该文对金属结构改建设计进行了介绍,对高扬程卷扬启闭机设计的关键部位卷筒和挡环进行了重点介绍。 相似文献
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王远旺 《水科学与工程技术》2011,(4):39-41
云州水库除险加同工程金属结构部分根据闸门和启闭机目前存在的问题进行了改建设计.对泄洪洞进口事故闸门卷扬启闭机和发电输水洞进口事故闸门卷扬启闭机进行了更新,启闭机容量和扬程均较大.该文对金属结构改建设计进行了介绍,对高扬程卷扬启闭机设计的关键部位卷筒和挡环进行了重点介绍. 相似文献
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本文论述了台江空寨水库工程的金属结构设备的选型布置设计的思路和方法,溢洪道检修闸门启闭机采用门机式启闭机,溢洪道工作闸门启闭机采用了顶升柱塞式液压启闭机,布置独特。该工程金属结构闸门、启闭机布置及设计吸收了同类型工程的设计经验,结合本工程特点和运行要求,布置紧凑、结构合理、设备运行良好,可供同类工程设计参考。 相似文献
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中国三峡总公司设备部 《中国三峡建设》2002,9(11):11-12
三峡二期工程招标采购的金属结构设备,启闭机设备共约11万吨,共有25个厂家承担三峡二期工程金属结构及启闭机设备制造。为了确保三峡二期工程金属结构及启闭机设备制造质量和交货期。逐步形成了以设备制造厂和设备监造为核心,围绕设备制造质量管理,进度控制目标,以设备制造质量体系为基础,分工明确,职责清晰,集技术管理,设计管理,合同管理,监造管理,项目管理五大管理的组织协调监控管理体系。 相似文献
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综合构皮滩水电站泄洪建筑物金属结构的结构形式及启闭机型式的特点,详细介绍了设计的基本参数、泄洪建筑物金属结构及启闭机布置、电站建筑物金属结构及启闭机布置.该工程各类闸门、拦污栅等58扇,压力钢管5条以及各类启闭机械35套,总工程量约24 000余t. 相似文献
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本文介绍了平板闸门和启闭机的勘察和测量情况,对闸门强度和启闭机容量进行了验算,提出了闸门和启闭机在一定的条件下可以临时做为工作门使用。针对闸门和启闭机存在的问题提出了相应处理的方法,并提出今后在金属结构设计、制造、安装及运行管理方面都要严格按规范执行,确保工程的正常运行。 相似文献
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河北省水利工程局机械厂创建于1955年,是河北省从事水工金属结构、启闭机及机电设备制作、安装、防腐工程的专业厂家,并且第一批获得水利部、原能源部颁发的大型弧形闸门、大型平面滑动闸门、大型平面定轮闸门、水工金属结构防腐施工及大型固定卷扬式启闭机、中型移动式启闭机、中型压力钢管的生产许可证。 相似文献
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对嘉兴地区主要给水厂近年来应用立体弹性填料、LT型悬浮球填料、YS型悬浮填料、卵石填料等的生物预处理工艺从填料及配套设施、工艺运行参数、运行效果、成本等方面进行了比较.认为弹性填料生物预处理更适用于低浊(50 NTU以下)、低氨氮(1.5 mg/L以下)原水,LT型悬浮球填料生物预处理适用于低中浊(100 NTU以下)、低中氨氮(2.5 mg/L以下)原水,YS型悬浮填料生物预处理及"SAF"滤池对低浊、中高氨氮(2.5 mg/L以上)原水有较好的适应性.最后探讨了弹性填料存在的短流、积泥,悬浮填料存在的部分填料流化不均匀,富氧的生物工艺单元内水生动物泛滥等问题. 相似文献
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Changes in nutrient levels in some Eastern European rivers in response to large-scale changes in agriculture. 总被引:3,自引:0,他引:3
P St?lnacke S M Vandsemb A Vassiljev A Grimvall G Jolankai 《Water science and technology》2004,49(3):29-36
Since the late 1980s, the use of commercial fertilisers in most Eastern European countries has decreased at an unprecedented rate. We examined the impact of this dramatic reduction in agricultural inputs on concentrations of nutrients in four rivers in Eastern Europe: the Emajogi and Ohnejogi (Estonia), the Daugava (Latvia), and the Tisza (Hungary). Time series of nitrate (NO3-N) and phosphate (PO4-P) concentrations and data on runoff were selected to represent catchments with substantial areas of agricultural land and available time series of sufficient length and frequency. The study period was 1987-1998. We detected downward trends in nitrate-N and phosphate-P in only two of the four rivers. Our results imply that the response to the extensive decrease in agricultural intensity since the late 1980s has been slow and limited in many rivers. Corresponding results in the literature are inconclusive and comprise several examples of both decreasing and non-decreasing nutrient concentrations. Our findings, along with similar data from other studies, indicate that large cuts in nutrient inputs do not necessarily induce an immediate response, particularly in medium-sized and large catchment areas. Moreover, the difference we noted between nitrogen and phosphorus suggests that factors other than reduced fertiliser application influenced the inertia of the water quality response. 相似文献
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对长江、珠江等河口及其近海水域缺氧现象与影响因素进行研究,结果表明,主要分布于长江与珠江河口及其邻近海域的缺氧现象,夏季(6—8月)达到最盛,秋冬季消失;长江口的缺氧区域主要位于30.75°N~32°N,122.5°E~123.25°E附近海域,具有南北2个缺氧中心;珠江口缺氧程度相对较轻,缺氧区域主要在广州黄埔区河段至虎门水域和伶仃洋;辽河、钱塘江、海河等河口区域也时而出现零星的缺氧现象;水体缺氧受控于多项环境要素,物理层化作用是缺氧产生的最初诱因之一,陆源污染物的分解则是重要的耗氧负荷;各河口区特征各异,潮汐、洋流、营养盐、叶绿素a等要素对缺氧区的范围、程度和持续时间影响程度不一。 相似文献
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深圳河支流新洲河属雨源型河流,因污染而采取全线截排污水整治.在上游河道内利用生物飘带技术处理低浓度污水,处理达标后,作为河流生态水源.在中游将截排污水引入自然循环方式污水处理系统,处理达标后作为河道补水.下游利用射流清淤配合利用天文大潮进行水体交换,达到消除黑臭水体,维持河道水景观的目的.介绍新洲河水环境综合整治采用的几项关键技术的设计原理及应用效果. 相似文献
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李广杰 《水科学与工程技术》2001,(5):7-8
洋河水库是我省重点病险库之一,1998年12月实施除险加固工程。工程建设过程中在科研、设计、施工及管理等方面取得了可喜的成果。通过研究分析,因地制宜地选择了天然建筑材料,合理确定了施工方案,有效保证了施工质量,节约了工程投资。 相似文献
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Ecological river engineering can be defined as the design and implementation of river works and river restoration works for the benefit of human society. It also guarantees the sustainable ecological functions of a river, such as its habitats and self-purification of its water. It is currently in the beginning stages in Korea, utilizing scientific knowledge on the processes of aquatic ecosystem degeneration and a methodology for solving the ecological problems in artificially altered rivers currently under development. The changes in river management and work practices in Korea may be best explained with a chronologically progressing sequence of ‘Natural’, ‘Disaster-prevention’, ‘Occupied’, ‘Park’, and ‘Close-to-nature’ rivers. Since the 1960s, the focus on river management and work has shifted from flood control only, to both flood control and riverine habitat conservation and restoration. Five research topics have been selected for this article, and the progress of each research area is briefly described with a representative picture in each topic. They are as follows: (1) flow resistance due to vegetation, (2) environmental flow, (3) floodplain vegetation modeling, (4) small dam removal, and (5) river restoration. For the future prospects of research on ecological river engineering in Korea, a necessity of further research on floodplain vegetation recruitment and succession, which can explain the so-called ‘white river’ and ‘green river’, is underlined, among others. Finally, two ongoing large research programs on river ecosystem restoration, of which are sponsored by the Government of Korea, are briefly introduced, followed by the introduction of a near-prototype experiment facility recently completed mainly for research on ecological river engineering. 相似文献