预制与现浇形式下管廊结构内力分析

发布时间：2018-03-13 04:37

本文选题：预制综合管廊　切入点：现浇综合管廊　出处：《湘潭大学》2017年硕士论文　论文类型：学位论文

【摘要】：各大城市公用设施改造及增设管线越发多见,电力、通讯、广电、给排水、热力、燃气等市政工程也需要更加规范布置。传统的管线直埋方式有诸多弊端,亟待解决。采用地下综合管廊正成为解决城市公用设施布置问题的另一种方式。城市地下综合管廊解决路面反复开挖坍塌、架空线网密集、用地紧张、城市美观等问题。长期以来受到技术、资金等原因阻碍综合管廊发展。为在2020年建设完成一批完善的地下管廊体系,住建部在2015年、2016年先后公布二十五个试点城市,标志着全面启动地下综合管廊试点工程。综合管廊主要分为两类,预制综合管廊和现浇综合管廊。本文主要对这两种施工方式下,在多种工况下进行对比分析管廊结构内力。通过三维数值模拟软件建立模型,进行预制管廊与现浇管廊在多个工况下的对比分析。得到以下结论:(1)在均匀地基上,预制管廊结构内力比现浇管廊结构内力小,内力值相差较小。在纵向不均匀地基上,预制管廊结构内力分布形态与现浇管廊结构内力分布形态相似,预制管廊结构内力偏大,可知地基纵向差异沉降预制管廊结构内力影响相对更大。在横向不均匀地基上,对预制管廊和现浇管廊结构内力有较大影响,内力值变化幅度相似,现浇管廊整体内力稍大。(2)在车载作用下,均匀地基上现浇管廊和预制管廊内力大小相差较小,预制管廊整体内力稍大。地基不均匀性对预制管廊影响更大,主要对轴力影响明显。预制管廊主要在沿管廊长度方向轴力增大明显,而轴力增大明显部位为管廊段间连接处,此处有预应力钢绞线承受轴向拉力。在多工况下管廊四条边缘处内力较大,容易引发破坏,故在设计及生产时需要加强配筋,进行加固。
[Abstract]:More and more public facilities in major cities have been renovated and pipelines added. Municipal projects such as electric power, communications, radio and television, water supply and drainage, heat and gas, and other municipal projects also need more standardized arrangements. The traditional way of directly burying pipelines has many drawbacks. The adoption of the underground integrated pipe gallery is becoming another way to solve the problem of urban public facilities layout. The city underground integrated pipe gallery solves the repeated excavation and collapse of the road surface, the dense aerial network and the tight land use. Problems such as urban aesthetics. For a long time, technical, financial and other reasons have hindered the development of the integrated pipe corridor. In order to complete a number of perfect underground plumbing systems in 2020, the Ministry of Housing and Construction announced 25 pilot cities on 2015 and 2016. Marks the full start of the pilot project of underground integrated pipe gallery. The integrated pipe gallery is divided into two main categories, prefabricated integrated pipe gallery and cast-in-place integrated pipe gallery. The internal force of pipe gallery structure is analyzed comparatively under various working conditions. The model is established by three dimensional numerical simulation software, and the comparison analysis between prefabricated pipe gallery and cast-in-place pipe gallery under multiple working conditions is carried out. The following conclusions are drawn: 1) on the uniform foundation, The internal force of prefabricated pipe-gallery structure is smaller than that of cast-in-place pipe-gallery structure, and the internal force value of prefabricated pipe-gallery structure is smaller than that of cast-in-place pipe-gallery structure. On the longitudinal uneven foundation, the internal force distribution pattern of prefabricated pipe-gallery structure is similar to that of cast-in-situ pipe-gallery structure. It can be seen that the internal force of the prefabricated pipe gallery structure with longitudinal differential settlement of foundation has a greater influence on the transverse uneven foundation, and the internal force value of the prefabricated pipe gallery and cast-in-place pipe gallery structure is similar. Under the action of vehicle, the force difference between cast-in-place pipe gallery and prefabricated pipe gallery on uniform foundation is small, the whole internal force of prefabricated pipe gallery is slightly larger, and the influence of foundation inhomogeneity on prefabricated pipe gallery is greater. The main effect on the axial force is obvious. The axial force increases obviously along the length of the pipe corridor, and the obvious part of the axial force increase is the junction between the pipe and corridor segment. The prestressed steel strands are subjected to axial tensile force. The internal force at the four edges of the pipe gallery is large under various working conditions, which can easily lead to damage. Therefore, reinforcement should be strengthened in design and production.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU990.3;TU311

【相似文献】