隧道衬砌台车轻型化研究与应用

发布时间：2018-03-15 18:02

本文选题：隧道衬砌台车　切入点：轻型化　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：当前我国掀起更高层次的大规模交通基础设施建设。特别是在我国西部多山地区,交通建设必然伴随着修建大量隧道工程。作为隧道结构重要构成部分的二次衬砌,隧道衬砌模板台车是其主要施工设备。隧道衬砌台车跨度和体积大,且一般由钢构件组成,所以通常重量很大。本文着眼便于施工和安全控制、节约材料、降低造价,对模块化隧道衬砌台车的进一步轻型化,从隧道台车所受荷载计算、结构优化设计和分析到工程试用与观测,开展一系列深入研究。主要研究工作如下:(1)全面介绍现有隧道工程中常用二次衬砌施工设备原理、结构、主要施工方法及适用范围。综合发现,模板台车的设计大多采用工程类比法。由该方法设计的台车重量大,且重复利用率低。(2)依照某在修隧道的围岩级别分布情况,分级设计整条隧道衬砌结构,从而为确定衬砌台车模板实际所受荷载提供较为明确、可靠的依据。(3)基于分析得到的模板在衬砌施工过程中承受的荷载,初步设计台车型式及主要构件。对于台车重量占比较大的门架系统,采用变截面方法设计门架横梁和立柱,以充分利用材料截面性质,减少门架材料用量。并且,在门架变截面面设计中,建立与控制截面最小弯矩对应的横梁夹角计算方法。(4)对初步设计出的台车,通过数值模拟,分析不同工况下的结构变形与受力,确定主导作用工况。继而将台车构件尺寸作为设计变量,台车重量作为目标函数,构件许用应力及变形控制值作为边界条件,运用拓扑方法,进一步分析优化模板台车主要系统结构形式与重量。优化后的台车重量降低43.7%。(5)将按照最后优化分析结果制作的台车,应用于以上隧道工程。从选定的某段衬砌混凝土浇筑到模板拆除,全过程测量台车结构主要控制点的变形和稳定。通过对比现场观测与数值分析结果,验证台车优化设计和分析的可靠性。
[Abstract]:At present, our country raises a higher level of large-scale traffic infrastructure construction. Especially in the mountainous areas of western China, traffic construction must be accompanied by the construction of a large number of tunnel projects. As an important part of tunnel structure, secondary lining, The tunnel lining formwork is the main construction equipment. The tunnel lining platform is large in span and volume, and is generally composed of steel members, so it is usually very heavy. This paper focuses on the convenience of construction and safety control, saving materials and reducing the cost. For the further lightening of modular tunnel lining, from load calculation, structural optimization design and analysis to engineering trial and observation, To carry out a series of in-depth studies. The main research work is as follows: 1) A comprehensive introduction to the principle, structure, main construction methods and scope of application of secondary lining construction equipment commonly used in existing tunnel projects. Most of the design of the formwork trolley is based on the engineering analogy method. The heavy weight and low reuse rate of the trolley designed by this method can be classified to design the whole tunnel lining structure according to the distribution of the surrounding rock grade of a tunnel under repair. Therefore, it provides a clear and reliable basis for determining the actual load on the lining platform truck formwork.) based on the analysis, the formwork is subjected to the load in the course of lining construction. Design the type and the main components of the trolley preliminarily. For the gantry system with a relatively large weight of the trolley, the method of variable cross section is used to design the gantry beams and columns to make full use of the cross-section properties of the material and to reduce the material consumption of the gantry. In the design of the variable cross section plane of the portal frame, the calculation method of cross beam angle corresponding to the minimum bending moment of the control section is established. The preliminary design of the vehicle is analyzed by numerical simulation, and the deformation and force of the structure under different working conditions are analyzed. Then, the dimension of the member is taken as the design variable, the weight of the trolley as the objective function, the allowable stress and deformation control value as the boundary condition, and the topological method is used. Further analysis of the structure and weight of the main system of the optimized formwork. After the optimization, the weight of the trolley will be reduced by 43.7% and (5) the car will be made according to the result of the final optimization analysis. It is applied to the above tunnel engineering. The deformation and stability of the main control points of the vehicle structure are measured in the whole process from a selected section of lining concrete pouring to the removal of the formwork. The results of field observation and numerical analysis are compared. Verify the reliability of optimization design and analysis.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.39

【参考文献】