本文選題：隧道襯砌臺車　切入點：輕型化　出處：《昆明理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：當前我國掀起更高層次的大規(guī)模交通基礎(chǔ)設(shè)施建設(shè)。特別是在我國西部多山地區(qū),交通建設(shè)必然伴隨著修建大量隧道工程。作為隧道結(jié)構(gòu)重要構(gòu)成部分的二次襯砌,隧道襯砌模板臺車是其主要施工設(shè)備。隧道襯砌臺車跨度和體積大,且一般由鋼構(gòu)件組成,所以通常重量很大。本文著眼便于施工和安全控制、節(jié)約材料、降低造價,對模塊化隧道襯砌臺車的進一步輕型化,從隧道臺車所受荷載計算、結(jié)構(gòu)優(yōu)化設(shè)計和分析到工程試用與觀測,開展一系列深入研究。主要研究工作如下:(1)全面介紹現(xiàn)有隧道工程中常用二次襯砌施工設(shè)備原理、結(jié)構(gòu)、主要施工方法及適用范圍。綜合發(fā)現(xiàn),模板臺車的設(shè)計大多采用工程類比法。由該方法設(shè)計的臺車重量大,且重復(fù)利用率低。(2)依照某在修隧道的圍巖級別分布情況,分級設(shè)計整條隧道襯砌結(jié)構(gòu),從而為確定襯砌臺車模板實際所受荷載提供較為明確、可靠的依據(jù)。(3)基于分析得到的模板在襯砌施工過程中承受的荷載,初步設(shè)計臺車型式及主要構(gòu)件。對于臺車重量占比較大的門架系統(tǒng),采用變截面方法設(shè)計門架橫梁和立柱,以充分利用材料截面性質(zhì),減少門架材料用量。并且,在門架變截面面設(shè)計中,建立與控制截面最小彎矩對應(yīng)的橫梁夾角計算方法。(4)對初步設(shè)計出的臺車,通過數(shù)值模擬,分析不同工況下的結(jié)構(gòu)變形與受力,確定主導(dǎo)作用工況。繼而將臺車構(gòu)件尺寸作為設(shè)計變量,臺車重量作為目標函數(shù),構(gòu)件許用應(yīng)力及變形控制值作為邊界條件,運用拓撲方法,進一步分析優(yōu)化模板臺車主要系統(tǒng)結(jié)構(gòu)形式與重量。優(yōu)化后的臺車重量降低43.7%。(5)將按照最后優(yōu)化分析結(jié)果制作的臺車,應(yīng)用于以上隧道工程。從選定的某段襯砌混凝土澆筑到模板拆除,全過程測量臺車結(jié)構(gòu)主要控制點的變形和穩(wěn)定。通過對比現(xiàn)場觀測與數(shù)值分析結(jié)果,驗證臺車優(yōu)化設(shè)計和分析的可靠性。
[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.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.39

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