共查询到20条相似文献,搜索用时 93 毫秒
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输气管道试压是对管道施工质量、管材性能及管道整体质量的一次综合检验,也是投产前对管道系统能否在设计压力下安全运行的最后一次检验。因此,基于管道试压在管道工程建设和运行中的重要意义,从试压介质、试压管段划分和强度试验压力等方面对试压工作进行了论述,并介绍了国内外输气管道试压标准在以上方面的相关规定,分析了不同标准之间的差异,通过对比指出了目前国内管道试压水平与国外的差距及今后的发展方向。 相似文献
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沥青路面QC/QA体系中,承包商负责沥青路面质量控制(QC)体系,业主进行质量保证试验,用以检验承包商质量控制结果的准确性。选择科学合理的取样方法能够使检测结果与实际情况更为接近,从而更有说服力。对随机取样法进行了介绍,并提出在沥青路面施工质量控制中应该采用分层随机取样法取样检测。 相似文献
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线路截断阀气液联动执行机构引压管安装 总被引:1,自引:0,他引:1
根据西气东输工程投产以来线路截断阀的运行情况、存在问题以及其他管道工程气液联动执行机构的安装实践,对气液联动执行机构引压管根部阀的选型及安装、引压管安装等问题进行探讨,并对天然气长输管道工程线路截断阀气液联动执行机构安装提出建议. 相似文献
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Wang Z.Zhuang X. 《现代隧道技术》2018,(5):33-44
In the whole process of survey, construction and operation of rock tunnels, hydraulic fracturing is a mechanical mechanism that needs to be focused. In this paper, numerical simulation for fracture damage constitutive model and analytical formula were used to study the hydraulic fracturing of stratified sedimentary rocks. Based on multi-field coupling finite element analysis software, and combining the linear elastic fracture criterion with the damage constitutive model, a seepage-stress-rock damage coupling model is redeveloped, in which micro cracks can be characterized, and applied to study the hydraulic fracturing of rock mass in the saturated seepage process. By introducing dispersed parallel micro cracks for simulating the beddings of sedimentary rocks, the sedimentary rock cylinder model was established to simulate the hydraulic fracturing behaviors under injecting water into apertures and acting of confining pressure, in order to study the fracturing failure modes and seepage distribution patterns. In addition, the quantitative relationship between the critical water pressure for initial cracking and the confining pressure, the pore diameter of specimens was discussed by changing the pore diameter and confining pressure. In order to verify the cracking initiation pressure law obtained by numerical simulation, based on the seepage theory and the basic equation of elastic mechanics, and combined with the tensile failure mode obtained in the simulation, the formula of critical water pressure for cracking initiation in the rock cylinder with uniform linear elastic seepage was derived. The results of analytical solution and numerical calculation show that the cracking initiation pressure obtained by the two methods is in good agreement with the deviation within 3%. The larger the confining pressure, the larger the cracking initiation pressure, with the approximate linear relationship. The smaller the aperture, the larger the cracking initiation pressure, with the approximate negative slope linear relationship in a certain range. At the same time, the cracking initiation pressure by the analytical solution is always slightly greater than that of the numerical solution, which reflects the impact caused by the difference of the basic material hypothesis between the analytical method and the numerical method. When the material property parameters are consistent, the cracking initiation pressure based on the assumption of ideal linear elastomer will be greater than that of the material introduced into the initial damage bedding. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved. 相似文献
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新大瑶山隧道穿越砂岩段揭露一高压出水点,出水点压力为3~4 MPa,流量为430 m3/h左右,水头喷射距离达47m,在突水治理中采取了引排水、施作止水墙、顶水注浆和全断面帷幕注浆综合技术措施,成功地封堵了高压突水,取得了理想的技术经济效果.文章介绍了新大瑶山隧道的工程概况、工程地质及水文地质条件,以及涌突水情况和治理措施. 相似文献
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宜万铁路马鹿箐隧道DK255+978处通过一高压富水隐伏溶腔,先后发生多达19次的突涌水(泥)灾害.在对该高压富水隐伏岩溶的处治中,系统地运用了释能降压原理,释放了溶腔所存储的能量,降低了水土压力对隧道的稳定性影响.释能降压技术主要采取了综合地质预报手段探明溶腔边界、内部充填物特性和分布特征等,并根据溶腔的水压、水量测试结果进行排水系统规划、钻孔泄水,采用控爆措施揭开溶腔,并进行实时预警预报监控.结果表明,运用释能降压技术处治马鹿箐+978溶腔,规避了岩溶溃水的风险,取得了良好的效果. 相似文献
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三峡工程泄洪深孔弧门液压启闭机管道安装工艺 总被引:1,自引:0,他引:1
详细介绍了三峡工程泄洪深孔弧门液压启闭机系统管道安装工艺 ,并对管道焊接工艺进行了具体阐述。特别是针对施工现场的特定环境改变传统的管道安装顺序 ,采取先装泵房及管道 ,后装油缸的工艺 ;对系统管道采取了一次串接注油、分次试压及线性循环冲洗与在线检测的新工艺。实践表明 :该工艺在工程中取得较好的应用效果 ,为深孔孤门液压启闭机系统按期调试奠定了坚实的基础。 相似文献