共查询到19条相似文献,搜索用时 250 毫秒
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论我国城市共同沟建设的发展战略 总被引:3,自引:0,他引:3
共同沟是在地下建造的集电力、通信、燃气、上水等各种市政管线于一体,同时设置专门的检修口、吊装口和监测控制系统的市政管线隧道。通过对我国城市共同沟建设现状的分析,概括出目前我国城市建设共同沟过程中表现出来的特点和问题;从我国大城市未来的城市发展,从奥运会、世博会的召开,对我国城市共同沟建设的需求和趋势进行了分析;提出了今后我国城市共同沟建设的发展方向及建设过程中应该遵循的一些原则,并就推进共同沟建设的发展战略提出了建议。 相似文献
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电动汽车充电基础设施规划中若干关键问题的研究与建议 总被引:3,自引:0,他引:3
由于在缓解能源危机与环境污染等问题方面的重要作用,电动汽车在世界上许多国家得到大力发展。与其紧密关联的充电基础设施的规划建设是影响电动汽车推广成效及发展规模的重要因素。本文首先分析了充电设施建设过程中世界各国存在的共同问题,以及我国的特殊问题;之后,对电动汽车发展规模预测、充电模式选择与充电设施配置、电网与充电设施的相互作用与影响等几个充电设施规划时需优先解决的关键问题进行了分析研究;最后,结合我国具体情况,针对充电基础设施的建设和规划布局中的核心问题提出若干指导性原则与建议。 相似文献
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安全防护设施是电建施工中的一项重要人身保护措施,是电力建设确保安全施工不可缺的重要有机组成部分,全面推行安全设施管理标准化、规范化、科学化是我们安全管理工作中的必然趋势。多年来火电施工中的安全设施由简单的、单一的,逐步实现了完善的多形式的标准化安全设施防护网,积累了一些比较成熟的经验并在安全施工中起到积极作用。 相似文献
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在火力发电厂、化工厂等大型工厂的建设中,都有循环水沟、贮水池、冲灰沟、排水沟等钢筋混凝土设施。由于施工和生产运行中的原因,这些设施经常出现泄漏现象。如何在不影响正常生产运行的情况下,将泄漏处堵好,是我们要研究的一个课题。本文介绍的两种堵漏方法,是从实践中总结出来的经验。当遇到类似问题时,可参考选用。 相似文献
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<正>综合管廊,亦称综合管沟或共同沟,即在地下建造管线隧道,收纳电力、通讯、给水、热力、燃气、排水等两种以上管线于一体的市政公用设施。综合管廊实施统一规划、设计、建设,共同维护、集中管理,能高效集约化地利用道路下的空间资源,有效避免因埋设、维修管线而导致道路反复开挖。2014年12月,国家住建部启动综合管廊试点建设工作,决定用三年时间在全国36个大中城市建设地下综合管廊工程,南昌在此次试点之内。 相似文献
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The scheme discussed here is unique: a large electrical network is spread over a very large geographic area. This creates an exceptional set of circumstances. Construction specifications and techniques are used that increase the reliability of the system above standard utility practices. This adds to the cost of the project, and necessitates modified approaches to overhead line construction. Transformer selection and design is greatly influenced by the size of the load, as well as overhead pole construction. PF correction is accomplished using both standard distribution level capacitors, and using medium-voltage capacitors at the voltage terminals. Lightning protection uses both standard surge arrestors on the line, as well as advanced grounding systems. In each of these cases, standard utility construction techniques are combined with industrial design to meet the requirements of the system. Without the use of computer-based system modeling, proper design and operation of such a complex system would be impossible. Computer models give an accurate picture of the loading on the system in a particular configuration. They also aid the engineer in selection and coordination of protective devices, as well as power-factor correction. Conclusively, with the aid of modern tools, a system can be constructed that serves the needs of an industrial user in a utility environment. 相似文献
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近年来,随着我国城市建设的高速发展,大量综合管廊工程建成并投产。照明系统作为管廊内部主要用电设备之一,其能耗水平直接影响管廊运营的经济性。本文通过分析综合管廊照明特点,提出一种智能照明控制系统。该控制系统可有效降低管廊照明能耗,实现节能目标。 相似文献
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地下综合管廊的建设是合理利用地下空间的有效手段。介绍了国内外城市地下综合管廊建设的概况,分析了地下综合管廊的特点,讨论了规划原则、建设条件以及包括其中电力管线敷设的有关技术问题。 相似文献
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The flexible-input, desired-output (FIDO) motor controller is a robust wireless motor controller specifically designed for engineering design classes where students design and build radio-controlled devices that are typically featured in an end-of-semester celebration or competition. The controller receives bidirectional control signals from a standard 72-MHz band hobby radio transmitter and proportionally drives four motors with up to 3 A of current in each. The controller is designed to accommodate changes to the battery voltage as well as motors with different voltage ratings. It is also designed to be built easily by teaching assistants and can be reused year after year. These capabilities are designed to lower the cost of running this type of class and reduce the organizational work load required of the instructors. Specifically, this motor controller enables the use of commercial cordless drill batteries as inexpensive, portable sources to power motors at a wide range of voltage ratings. The drills are also used during the class as construction tools and can be used by the student after the class. The FIDO motor controller has been successfully tested in the 2.007-Design and Manufacturing classes at the Massachusetts Institute of Technology (MIT) Cambridge, and its utility and acceptance are confirmed by a class survey. Detailed circuit schematics are provided in the Appendix. 相似文献