装配整体式综合管沟的试验及理论研究

发布时间：2018-01-10 23:13

本文关键词：装配整体式综合管沟的试验及理论研究　出处：《山东大学》2017年硕士论文　论文类型：学位论文

【摘要】：综合管沟作为一种集约型、可持续化的管线敷设方式,可有效避免城市道路频繁开挖,并能延长管线使用寿命。现有综合管沟的施工方式主要为现浇与全预制拼装两种,均存在着基坑开挖量大、回填量高的问题。考虑到叠合结构具有现浇与预制的双重优点,本文将其引入综合管沟,提出一种新型管沟形式—装配整体式综合管沟,并对其接头力学性能进行了深入研究。此种新型综合管沟的预制构件可形成基坑支护体,避免基坑大开挖与回填。主要研究内容及成果如下:(1)参照规范,设计了—种新型装配整体式综合管沟。该管沟的预制构件为带外伸平板的预制管节,接头处采用预制外伸平板与现浇混凝土相结合的连接方式;对接头连接构造进行了重点设计,保证了接缝处的承载能力与防水性能;给出了采用非拼接型预制管节的装配整体式综合管沟的设计方法:使用阶段进行整体管沟的计算,施工阶段进行预制U型外伸平板的验算。(2)结合工程实例,进行了现浇综合管沟、全预制拼装综合管沟、装配整体式综合管沟的设计;并对三种综合管沟的施工成本进行了分析与比较,结果表明:装配整体式综合管沟的成本最低,可比现浇综合管沟节省22%。(3)对装配整体式综合管沟接头进行了抗弯性能试验,得到了装配整体式板受弯过程中的破坏形态、抗弯承载力、荷载-挠度曲线、应变变化等;与现浇混凝土板相比,装配整体式板的抗弯性能较差,但仍然具有一定的延性,可满足一定的承载力要求。(4)通过有限元软件ABAQUS对装配整体式板的抗弯性能试验进行了数值模拟,弹性阶段模拟结果较为准确,塑性阶段模拟值与试验值误差较大。参数分析表明,提高混凝土强度等级、减少连接缝宽度、降低预留外伸平板厚度可增加装配整体式板的抗弯刚度。(5)根据试验现象以及弹性阶段有限元分析结果,将装配整体式板转化为等效变截面板进行装配整体式板抗弯承载力及挠度的计算,计算值与试验值较为吻合,误差小于15%。
[Abstract]:As a kind of intensive and sustainable pipeline laying, comprehensive pipe trenches can effectively avoid frequent excavation of urban roads. And can prolong the service life of pipelines. The existing comprehensive pipe trench construction methods are mainly cast-in-place and fully prefabricated assembly, there is a large amount of excavation foundation pit. Considering the double advantages of cast-in-place and prefabrication of superimposed structure, this paper introduces it into comprehensive pipe ditch, and puts forward a new type of pipe ditch form-assembly integrated pipe ditch. The mechanical properties of the joints are studied in depth. The prefabricated members of this new comprehensive pipe trench can form the foundation pit support body to avoid large excavation and backfill. The main research contents and results are as follows: 1) reference specification. A new type of assembly integrated pipe groove is designed. The prefabricated member of the pipe ditch is a prefabricated pipe segment with an outstretched plate, and the connection mode between the prefabricated outstretched plate and the cast-in-place concrete is adopted at the joint. The key design of the joint connection structure is carried out to ensure the bearing capacity and waterproof performance of the joint. In this paper, the design method of integral integrated pipe trench with non-spliced prefabricated joints is presented: the calculation of integral pipe ditch is carried out in the stage of use. In the construction stage, the checking calculation of prefabricated U-shaped outstretched flat plate is carried out. Combining with the engineering example, the design of cast-in-place comprehensive pipe ditch, fully prefabricated integrated pipe ditch and integral integrated pipe ditch are carried out. The construction cost of three kinds of integrated pipe trench is analyzed and compared. The result shows that the cost of assembling integral integrated pipe ditch is the lowest. Compared with cast-in-situ comprehensive gutter, the bending behavior of the integrated pipe joint was tested, and the failure pattern and bending capacity of the integral plate were obtained. Load-deflection curve, strain variation, etc. Compared with cast-in-place concrete slabs, the bending resistance of assembled monolithic slabs is poor, but it still has a certain ductility. The flexural behavior test of assembled integral plate is simulated by finite element software ABAQUS. The simulation results of elastic stage are more accurate. The parameter analysis shows that the strength grade of concrete is improved and the width of joint is reduced. The bending stiffness of the assembled monolithic plate can be increased by reducing the thickness of the reserved extension plate.) according to the experimental phenomena and the results of finite element analysis in elastic stage. The bending bearing capacity and deflection of the assembly integral plate are calculated by transforming the assembly integral plate into an equivalent variable section plate. The calculated value is in good agreement with the experimental value, and the error is less than 15.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU990.3

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