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管段浮运是沉管隧道施工的重要环节 ,本文以上海外环沉管隧道重量超过 4 10 0 0t的管段浮运为工程背景 ,首先介绍管段拖曳阻力的模型试验 ,然后说明拖轮配备、浮运工艺流程及浮筒助浮措施 ,最后简述黄浦江航道交通管制方法。 相似文献
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天津市滨海新区中央大道海河隧道穿越海河,采用沉管法施工工艺。由于位于内河上施工,其管段浮运和沉放与传统海上或者江河上沉管施工有较大差异。从管段浮运、二次舾装、沉放、初步对接、拉合、基底注浆和回填覆盖等施工工艺上,开辟了一条简单、实际可行的沉管隧道浮运沉放新技术路径。 相似文献
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天津市中央大道海河隧道跨河沉管段为直线段连接曲线段的沉管隧道,作为沉管连接段的接头部位,端钢壳的安装精度直接影响了沉管隧道的沉放对接精度及隧道线路的走向.端钢壳安装分为沉管预制阶段安装和暗埋段安装两部分,其中沉管预制阶段的端钢壳垂直倾角最大88.9809°,要求精度极高且安装精度极大.文章介绍了暗埋段端钢壳安装及半径1500 m预制沉管段端钢壳安装测量精度控制方法. 相似文献
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地源热泵地下埋管换热器系统形式及设计计算 总被引:5,自引:0,他引:5
本文介绍了地源热泵地下埋管换热器系统形式及设计计算中的有关问题,其中包括埋管方式、埋管深度、地下埋管系统的环路形式、埋管材料、埋管间距、埋管系统的管径选择及水力和热力计算等问题。 相似文献
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简单介绍了当前市政工程中通常选用的埋地塑料排水管的类型,结合设计中可能存在的问题,详细地叙述了埋地塑料排水管所采用的管道基础、管道回填要求、管道接口及管道与检查井连接采取方式等,并探讨了埋地塑料排水管道环刚度的选取技巧,以供参考. 相似文献
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《Geotextiles and Geomembranes》2021,49(5):1117-1128
Buried pipes may transport substances that can be harmful to people and the environment. These structures may be subjected to damages caused by soil movements and external interference, such as surcharges and excavations. Different applications of geosynthetics have demonstrated that they can be used to protect buried pipes and to minimize the consequences of pipe burst. This paper discusses results of large scale laboratory tests on a flexible pipe buried in unreinforced and geosynthetic reinforced soils subjected to surface surcharges. The pipes were buried in a cohesionless soil and different types of reinforcements were tested, with a wide range of tensile stiffness values. The results obtained show that the arrangement of the reinforcement enveloping the pipe reduced significantly pipe displacements and deflections. The efficiency of the reinforcement depended on its type and physical and mechanical properties. The open geogrid tested showed less reinforcement efficiency due to the passage of soil particles through its aperture during the tests. A theoretical solution available for pipes in unreinforced soils was extended to the reinforced situation with good agreement between predictions and measurements and showed that the presence of the reinforcement is equivalent to the pipe being buried in a significantly stiffer unreinforced soil. 相似文献
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大管径热水供热管道直埋设计的探讨 总被引:3,自引:3,他引:0
介绍了直埋热水管道应力分析理论。从管道的屈服温差、单位长度摩擦力、直管段锚固段的强度、钢管椭圆化变形、水平转角管段的应力、疲劳破坏、局部屈曲、聚氨酯泡沫塑料保温层的剪切强度的设计计算分析了大管径热水管道直埋设计中的主要问题。 相似文献
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结合武汉市汉口地区D700、D600中压铸铁干管改造的具体情况,研究、探讨埋地管改造施工工艺、管道材质的选择。 相似文献
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现阶段国内北方地区普通住宅项目户内采暖多采用埋地塑料管材,但针对埋地采暖管还没有完整的国家规范。地方标准也不能规范所有环节,容易出现选材不当、安装失误等影响用户使用的问题,不仅仅是室内热舒适度有所下降,甚至会造成不必要的经济损失。本文以某住宅项目为例,对埋地塑料管从选材、安装、运行等方面进行探讨,并对项目运行期间所出现的个别散热器不热等问题进行了深入分析。为今后相关工程的应用提供参考。 相似文献
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Shivprakash Iyer & Sunil K. Sinha 《Computer-Aided Civil and Infrastructure Engineering》2006,21(6):395-410
Abstract: Assessing the condition of underground pipelines such as water lines, sewer pipes, and telecommunication conduits in an automated and reliable manner is vital to the safety and maintenance of buried public infrastructure. To fully automate condition assessment, it is necessary to develop robust data analysis and interpretation systems for defects in buried pipes. This article presents the development of an automated data analysis system for detecting defects in sanitary sewer pipelines. We propose a three-step method to identify and extract cracks from contrast enhanced pipe images. This method is based on mathematical morphology and curvature evaluation that detects crack-like patterns in a noisy pipe camera scanned image. As cracks are the most common defects in pipes and are indicative of the residual structural strength of the pipe, they are the focus of this study. This article discusses its implementation on 225 pipe images taken from different cities in North America and shows that the system performs very well under a variety of pipe conditions. 相似文献