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影响城镇埋地聚乙烯燃气管道安全运行的突出问题,是管道坐标不准导致第三方施工破坏,现有电子标签存在一定的局限性,本文介绍的环型电子定位标签较好地解决了这个难题。 相似文献
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为规范城镇燃气埋地管道的第三方施工管控,加强第三方施工现场的安全管理,防止第三方施工损坏燃气管道设施,提出实际管控措施。 相似文献
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影响城镇燃气埋地聚乙烯管道安全运行的重要因素,一是管道坐标不准,导致第三方施工破坏;二是绿化植物的根茎包缠管道,存在台风吹倒大树时根茎拉伤管道的风险;三是地表植物影响抢维修作业的展开。结合城镇燃气管道的特点,开展对策研究,对于保证燃气管道安全运行具有特别重要意义。 相似文献
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近日,从国家质量监督检验检疫总局获悉,哈纳斯新能源集团与中国特种设备检测研究院合作的"城镇燃气压力管道定期检验试点项目"获得批准。哈纳斯以HSE为生命,高度重视安全生产,并及时做好隐患排查工作。其中,因地下燃气管道埋设时间长短不同,又受到地质变化、介质腐蚀、第三方施工破坏、管材寿命等因素的影响,埋地管线存在破损泄漏隐患。自2011年10月起,供气事业部与中国特种设备检测研究院合作,对银川市区超过2000km的埋地钢制管网进行检验评估,整个检验工作将持续两年。 相似文献
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在对一起燃气管道被第三方外损的案例分析中,发现第三方施工破坏只是表面诱因,更深层次的本质原因是原燃气管道施工严重不符合规范,留下了较大的安全隐患。通过对现场情况和施工历史资料的调查排摸,确定原施工时钢管连接时存在较大的变向折角和对接角,在非自由状态下进行组对焊接,造成了外力作用下的开裂,从而导致燃气大量泄漏。给出了埋地燃气钢管焊接质量的控制要点,同时提出只有注重施工中细节管理,才能保证施工质量。 相似文献
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阐述了埋地燃气钢管防腐的重要意义,通过对某管道燃气公司埋地燃气钢管腐蚀检测,分析了产生腐蚀的原因,提出了减缓腐蚀的方法与对策,对该公司的外加电流深井阳极阴极保护法的防腐实践进行总结与探讨. 相似文献
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阐述了埋地燃气钢管防腐的重要意义,通过对某管道燃气公司埋地燃气钢管腐蚀检测,分析了产生腐蚀的原因,提出了减缓腐蚀的方法与对策,对该公司的外加电流深井阳极阴极保护法的防腐实践进行总结与探讨。 相似文献
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水泥搅拌桩在城市道路软基处理中的应用 总被引:1,自引:0,他引:1
城市道路在软基处理技术上的要求比普通公路要求高,因为城市道路在建设过程中会同步埋设雨污水、强弱电、自来水和燃气等管线,其中雨污水管道因常采用重力流设计,因此对路基沉降要求比较高。水泥搅拌桩作为技术较为成熟的软基处理方式,在科学的施工方法和有效的质量控制措施下,可有效提高软土地基的承载能力、抗震液化能力和控制路基沉降,保证路基稳定性,满足城市道路管线工程对路基工后沉降的要求。本文通过工程实例,介绍水泥搅拌桩在城市道路软基处理中的施工方法和质量控制措施。 相似文献
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对上海某地区天然气埋地钢管事故原因进行分析,并经现场开挖得以验证,据此提出了要加强城市埋地燃气管道检测技术在管道施工中的应用。 相似文献
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It is very important that the existing networks of underground pipelines be clearly surveyed when the underground space of an old urban area is rebuilt and expanded. The GPR method is always used to locate the embedded pipes; however, it is hard to determine their diameters, especially, when the underground pipe is full of a lossy medium (i.e., water, oil, or gas) during the operation period. First, this paper proposes a new method for probing and predicting the diameter of underground pipelines filled with lossy media based on GPR using the shape of a certain circle determined by the coordinates of three points on this circle. The operational procedure of this method is listed in detail. Secondly, this method is used to detect the diameters of underground pipelines in a model experiment and the project for the detection of a sewage pipe network in Yi’xing chemical industrial park. The measurement value is approximately consistent with the real value. Lastly, some factors influencing the accuracy of this method were comprehensively analysed by applying the finite difference time domain method (FDTD). These factors are the buried depth of the pipe, the detecting frequency of the GPR, the material of the pipe and the spacing of the measured points. The results showed that the proposed method has sufficient applicability and accuracy for practical engineering. These works demonstrate that the proposed method achieves good result. 相似文献
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隧道开挖对邻近非连续接口地埋管线的影响分析 总被引:1,自引:0,他引:1
隧道开挖引起的地面沉降会引起邻近区域地埋管线的附加受力和变形,甚至会引起管线的开裂破坏。将隧道开挖引起的地面沉降效应作为外界条件施加于地埋管线上,基于改进的Winkler地基模型,并采用虚拟节点以考虑管线接口处的力学特性,提出了刚度非连续接口管线在隧道开挖条件下响应的简化理论分析方法。通过与弹性理论法、离心机试验和实际工程对比,验证了该方法的合理性。并通过与层状弹性理论解的对比,得到了该方法在非均质地基中的适用性。参数分析认为忽略管线接口存在的连续管线假设在分析接口地埋管线有不合理处。 相似文献
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介绍城市道路下燃气管道位置的横断面设计方法,对现行标准规范的相关内容进行讨论,探讨了输气管道与其他管线的间距。 相似文献
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Reza KHADEMI ZAHEDI Pouyan ALIMOURI Hooman KHADEMI ZAHEDI Mohammad SHISHESAZ 《Frontiers of Structural and Civil Engineering》2020,14(1):147
Nowadays, polyethylene composes a large number of natural gas distribution pipelines installed under the ground. The focus of the present contribution is two fold. One of the objectives is to investigate the applicability of polyethylene fittings in joining polyethylene gas pipes which are electrofused onto the pipe ends and buried under the ground, by estimating stress distribution using finite element method. The second objective is to study the effectiveness of polyethylene repair patches which are used to mend the defected pipelines by performing a finite element analysis to calculate peak stress values. Buried polyethylene pipelines in the natural gas industry, can be imposed by sever loadings including the soil-structure interaction, traffic load, soil’s column weight, internal pressure, and thermal loads resulting from daily and/or seasonal temperature changes. Additionally, due to the application of pipe joints, and repair patches local stresses superimposed on the aforementioned loading effects. The pipe is assumed to be made of PE80 resin and its jointing socket, and the repair patch is PE100 material. The computational analysis of stresses and the computer simulations are performed using ANSYS commercial software. According to the results, the peak stress values take place in the middle of the fitting and at its internal surface. The maximum stress values in fitting and pipe are below the allowable stresses which shows the proper use of introduced fitting is applicable even in hot climate areas of Ahvaz, Iran. Although the buried pipe is imposed to the maximum values of stresses, the PE100 socket is more sensitive to a temperature drop. Furthermore, all four studied patch arrangements show significant reinforcing effects on the defected section of the buried PE gas pipe to transfer applied loads. Meanwhile, the defected buried medium density polyethylene gas pipe and its saddle fused patch can resist the imposed mechanical and thermal loads of 22°C temperature increase. Moreover, increasing the saddle fusion patch length to 12 inches reduces the maximum stress values in the pipe, significantly. 相似文献