本文選題：步履式頂推　切入點：橫向糾偏　出處：《西南交通大學(xué)》2015年碩士論文

【摘要】：頂推施工方法具有結(jié)構(gòu)預(yù)制場地集中,有利于生產(chǎn)作業(yè)的最佳組織,施工快捷等優(yōu)點,在跨越鐵路線的橋梁中,被廣泛使用。步履式頂推相對傳統(tǒng)的拖拉式頂推有一定的優(yōu)越性,對于一些跨線橋的梁體頂推有著較高的適用性和安全性。我國于2010年在杭州九堡大橋中首次采用步履式頂推工藝,對步履式頂推研究較少,其關(guān)鍵技術(shù)的研究遠遠不能滿足實際工程需要。本文依托頂推工程項目,基于理論分析和數(shù)據(jù)統(tǒng)計分析相結(jié)合的研究方法,對鋼混組合梁步履式頂推的橫向偏位開展了專項研究。內(nèi)容主要包括以下幾個部分：首先,在閱讀大量國內(nèi)外相關(guān)文獻基礎(chǔ)上,綜述了步履式頂推的研究現(xiàn)狀,找出了該領(lǐng)域研究的不足之處,提出了開展鋼混組合梁步履式頂推橫向偏位產(chǎn)生原因、規(guī)律及糾偏策略的研究課題。其次,用ANSYS建立模型,分析了梁體橫向偏位對橋墩橫向變形,橋墩的局部壓力和對鋼箱梁局部穩(wěn)定的影響。同時對每個行程各個橋墩的頂升千斤頂?shù)男凶呔嚯x差異進行統(tǒng)計,分析頂推過程中箱梁橫向偏位的原因。然后,統(tǒng)計了左右幅在每個頂推循環(huán)結(jié)束,落梁后的箱梁偏位情況,并根據(jù)梁體的偏位監(jiān)測結(jié)果,分析偏位增量的數(shù)理統(tǒng)計機理。統(tǒng)計結(jié)果表明,單次循環(huán)橫向偏位增量基本滿足正態(tài)分布。最后,利用線性優(yōu)化理論,結(jié)合實測梁體偏位數(shù)據(jù),提出較為高效的糾偏策略,減少糾偏耗時。以上研究結(jié)果可為步履式頂推橫向偏位的工程應(yīng)用和進一步研究提供參考。
[Abstract]:The method of jacking construction has the advantages of centralized prefabricated structure, favorable to the best organization of production operation and quick construction, etc., in the bridge crossing railway line, It is widely used. The walking push has some advantages over the traditional drag-and-pull push. In 2010, in Hangzhou Jiubao Bridge, the walking pushing technology was adopted for the first time. The research of the key technology is far from meeting the actual engineering needs. This paper relies on pushing the project, based on the combination of theoretical analysis and data statistical analysis. A special research on the lateral displacement of steel-concrete composite beams is carried out. The contents mainly include the following parts: firstly, based on reading a large number of domestic and foreign literatures, the research status of stepping thrust is summarized. This paper finds out the shortcomings of the research in this field, and puts forward the research topics on the cause, regularity and rectifying strategy of stepping push lateral deviation of steel-concrete composite beam. Secondly, the model is established by ANSYS. The effects of transverse deflection of beam body on lateral deformation of pier, local pressure of pier and local stability of steel box girder are analyzed. The reasons of transverse deflection of box girder in the process of pushing are analyzed. Then, the deviation of box girder with left and right amplitudes at the end of each pushing cycle and after falling beam is counted, and according to the monitoring results of deflection of beam body, The mathematical statistical mechanism of offset increment is analyzed. The statistical results show that the horizontal offset increment of a single cycle basically meets the normal distribution. Finally, by using the linear optimization theory and combining the measured deflection data of beam body, a more efficient deviation correction strategy is proposed. The results above can provide a reference for the engineering application and further research of step push lateral deflection.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.462

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