【摘要】：造橋機是橋梁施工中應(yīng)用較多的一種先進機械設(shè)備,膠接縫節(jié)段拼裝法是采用造橋機施工時一種較新穎的施工方式。膠接縫節(jié)段拼裝箱梁接縫處沒有縱向普通鋼筋和混凝土的連接,整孔梁通過梁段間的剪力鍵和預(yù)應(yīng)力形成整體,對拼裝過程中的線形要求非常高。因此研究造橋機在節(jié)段膠拼箱梁施工過程中的線形變化規(guī)律和調(diào)整方法是非常有必要的,具有較強的實用意義,為以后采用同類造橋機進行節(jié)段膠拼箱梁的施工提供指導和參考。本文在回顧國內(nèi)外既有造橋機及節(jié)段膠拼技術(shù)的基礎(chǔ)上,以平潭鐵路北東口水道特大橋64 m節(jié)段拼裝為實際工程背景,利用有限元分析軟件ANSYS對一種新型造橋機—SPZ2700/64型腹式節(jié)段拼裝造橋機的力學性能及膠拼64 m箱梁的過程進行模擬分析,主要工作和結(jié)論如下:(1)研究提出了一種新型造橋機—SPZ2700/64型腹式節(jié)段拼裝造橋機,論述了其技術(shù)設(shè)計方案、各部件的組成、施工步驟及施工注意事項等。(2)運用ANSYS軟件建立了造橋機和箱梁的力學模型,分析了造橋機在全部承載梁段、造橋機過孔過程中前端懸臂最大和后端懸臂最大三種不利工況下的力學性能,得出了造橋機在這三種不利工況下主桁各主要桿件的內(nèi)力,分析了造橋機主桁的強度和穩(wěn)定性。分析結(jié)果表明:在三種不利工況下,造橋機主桁各桿件的內(nèi)力均在規(guī)范規(guī)定的容許范圍內(nèi),過孔過程中后端懸臂最大的工況為最不利工況,此時桿件內(nèi)力最大;結(jié)構(gòu)在三種不利工況下都處于局部失穩(wěn)狀態(tài),但結(jié)構(gòu)整體滿足規(guī)范和使用要求。(3)利用ANSYS軟件分別對每節(jié)梁段的拼裝過程建立了有限元模型,得出了造橋機的初始線形,根據(jù)初始線形按設(shè)計的固定初始位置擺放部分梁段,模擬得出了每次移動并拼接一節(jié)梁段后,造橋機各絲杠標高及其軸力的變化,分析并得出了線形調(diào)整方法。拼接過程的模擬結(jié)果表明:對于膠接縫節(jié)段拼裝法,采用逐段拼裝逐段調(diào)節(jié)的過程來施工,也就是在拼接過程中通過調(diào)節(jié)絲杠標高及控制絲杠軸力來控制節(jié)段拼裝過程中橋梁的線形,得到的最終結(jié)果能滿足橋梁設(shè)計線形的要求。
[Abstract]:Bridge-making machine is a kind of advanced mechanical equipment which is widely used in bridge construction. The glue joint segment assembly method is a novel construction method in the construction of bridge construction machine. There is no longitudinal connection between common steel bar and concrete at the joint of jointed box girder. The whole hole beam is formed by the shear key and prestressing force between the beam segments, so the alignment requirement in the process of assembling is very high. Therefore, it is very necessary and practical to study the changing law and adjusting method of the linear shape of the bridge construction machine in the construction process of the segmental gluing box girder. It provides guidance and reference for the construction of segmental glue box girder with similar bridge-making machine. On the basis of reviewing the existing bridge construction machines and segmental glue assembly technology at home and abroad, this paper takes the 64 m section assembly of the Beidongkou Waterway Bridge in Pingtan Railway as the practical engineering background. The mechanical properties of a new type of bridge-making machine, SPZ2700 / 64, and the process of assembling 64 m box girder are simulated and analyzed by using the finite element analysis software ANSYS. The main work and conclusions are as follows: (1) A new type of bridge-making machine, SPZ2700 / 64, is proposed, and its technical design scheme and components are discussed. (2) the mechanical model of bridge maker and box girder is established by using ANSYS software. The mechanical properties of the main truss members of the bridge machine under the three unfavorable working conditions are obtained, and the strength and stability of the main truss are analyzed. The results show that the internal forces of each member of the main truss of the bridge machine are all within the allowable range stipulated in the code under three unfavorable working conditions, and the most disadvantageous working condition is the maximum working condition of the rear end cantilever in the process of passing through the hole, when the internal force of the member is the largest; The structure is in the state of local instability under three unfavorable conditions, but the whole structure meets the requirements of code and application. (3) the finite element model is established for each segment of beam assembly by using ANSYS software, and the initial alignment of the bridge construction machine is obtained. According to the initial line shape, according to the fixed initial position of the design, the variation of the elevation of each lead screw and its axial force of the bridge construction machine is obtained by simulation after moving and splicing one section of beam section each time, and the adjustment method of the line shape is analyzed and obtained. The simulation results of stitching process show that: for the glue joint segment assembly method, the process of piecewise assembly adjustment is adopted to construct, In the process of splicing, the alignment of the bridge is controlled by adjusting the elevation of the screw and controlling the axial force of the screw, and the final results can meet the requirements of the design of the bridge.
【學位授予單位】：石家莊鐵道大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.4

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