活性粉末混凝土管道在输水工程中的应用研究

发布时间：2018-03-08 18:23

本文选题：活性粉末混凝土　切入点：输水管道　出处：《河北农业大学》2015年硕士论文　论文类型：学位论文

【摘要】：市政输水管道主要铺设在城市地面以下,管道系统的安全关系着整个城市供水的安全性。由于管道的材料性质不同,使用年限短,长久失修,容易老化和退化,易受到腐蚀作用,造成市政输水管道频繁出现爆管现象。所以,合理选择管道材料以及规格,对市政输水工程非常重要,为市民能够正常的生产生活、营造良好的社会秩序提供了保证。RPC材料为超高强、高耐久性的水泥基复合材料,具有高韧性、体积稳定性优越、收缩徐变小、抗渗性强的特点。所以本论文研究新型材料-活性粉末混凝土管道在输水工程中的应用具有重要意义。本论文为此开展的工作如下:本论文通过查阅国内外资料以及相关文献,以课题组导师之前的实验研究数据为参照,参照埋地输水管道所承受的力学性能,以及活性粉末混凝土的优越性能,通过ANSYS有限元分析软件,建立RPC材料的埋地输水管道的有限元模型。首先对活性粉末混凝土管道进行静力分析,管道结构在承受永久荷载和作用时,从位移和应力应变云图中可以看出,均为以Y轴为基准,呈对称式分布;其次,在承受荷载以及公称内径不变的情况下,当壁厚值逐渐减小时对设定的45组活性粉末混凝土输水管道进行静力分析。归纳总结:在壁厚值逐渐减小到8mm附近,活性粉末混凝土输水管道的应力值达到极限甚至超过极限值,只有经过改善才可以在工程中使用。然后,在承受荷载以及公称内径不变时,在四种汽车荷载级别分别作用下,对不同壁厚的活性粉末混凝土输水管道进行静力分析,管道的应力随着汽车荷载级别的增加不断增大,即使在汽车超-20级时,应力仍能满足要求,能够在市政工程中安全使用;最后总结了活性粉末混凝土管道的构造及施工要求,包括管道合理布局及设计的注意事项、圆形管道接口形式、钢筋保护层取值、地基的处理、管网管理与维护的日常工作。
[Abstract]:Municipal water pipelines are mainly laid below the ground of the city. The safety of the pipeline system relates to the safety of the whole city's water supply. Due to the different material properties of the pipeline, the service life of the pipeline is short, the pipeline is long out of repair, and it is prone to aging and degradation. It is easy to be corroded, resulting in frequent pipe burst in municipal water conveyance pipeline. Therefore, reasonable selection of pipe materials and specifications is very important for municipal water conveyance projects, so that the citizens can have a normal production and life. Create a good social order to provide a guarantee. RPC materials for ultra-high strength, high durability of cement matrix composites, with high toughness, volume stability superior, shrinkage and creep smaller, Therefore, it is of great significance to study the application of a new type of material-reactive powder concrete pipeline in water conveyance engineering. The work of this paper is as follows: through consulting domestic and foreign materials and related literature, According to the experimental data of our tutor, the mechanical properties of buried water pipeline and the superior performance of reactive powder concrete, the finite element analysis software ANSYS is used. The finite element model of buried water pipeline with RPC material is established. Firstly, the static analysis of reactive powder concrete pipeline is carried out. When the pipeline structure is subjected to permanent load and action, it can be seen from the cloud diagram of displacement and stress and strain. All of them are symmetrical distribution based on Y axis. Secondly, under the condition that the load and nominal inner diameter are invariant, When the wall thickness decreases gradually, the static analysis of 45 groups of reactive powder concrete pipeline is carried out. The stress value of the reactive powder concrete pipeline reaches the limit or even exceeds the limit value, and it can only be used in engineering after improvement. Then, when the load and nominal inner diameter are not changed, the four kinds of vehicle load grade are acted on separately. The static analysis of reactive powder concrete (RPC) pipeline with different wall thickness shows that the stress of the pipeline increases with the increase of vehicle load grade, even when the vehicle is exceeding -20 grade, the stress can still meet the requirements and can be safely used in municipal engineering. Finally, the construction and construction requirements of the reactive powder concrete pipeline are summarized, including the reasonable layout and design of the pipeline, the form of circular pipeline interface, the value of the protective layer of steel bar, the treatment of foundation, the daily work of pipe network management and maintenance.
【学位授予单位】：河北农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528.73

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