【摘要】：隨著我國(guó)交通事業(yè)的快速推進(jìn)及高等級(jí)道路的網(wǎng)格化發(fā)展,各類立交工程也日益增多,其中有不少是在既有道路的基礎(chǔ)上修建立交橋,這就產(chǎn)生了大量的跨線匝道橋,這類匝道橋大多為彎橋、坡橋。同時(shí),由于頂推施工具有對(duì)既有道路的交通影響小,對(duì)施工場(chǎng)地的要求低等特點(diǎn),在跨線橋梁施工中被越來(lái)越多的采用。因此,對(duì)具有彎、坡性質(zhì)的橋梁頂推施工有關(guān)問(wèn)題的研究工作就存在著現(xiàn)實(shí)的需求。重慶市黃桷灣立交工程F匝道橋頂推項(xiàng)目,即為典型的采用頂推施工的小半徑、大縱坡鋼箱梁跨線工程。本文以此項(xiàng)目為依托,研究此類橋梁在頂推工程中梁體的整體及局部受力特點(diǎn),分析小半徑、大縱坡對(duì)鋼箱梁頂推及其空間形態(tài)的影響,以及等高梁預(yù)拱度設(shè)置對(duì)頂推施工的影響,并研究彎坡橋頂推施工監(jiān)控的難點(diǎn)及解決的關(guān)鍵技術(shù)。本文主要工作及結(jié)論包括:①運(yùn)用midas計(jì)算軟件建立鋼箱梁的受力分析模型,計(jì)算分析了鋼箱梁所受的支反力、鋼箱梁頂推過(guò)程中的豎向撓度和鋼箱梁應(yīng)力等在不同階段的變化規(guī)律;同時(shí),運(yùn)用混合單元法以板殼單元建立了鋼箱梁的局部模型,分析了頂推過(guò)程中鋼箱梁的局部受力,評(píng)價(jià)了鋼箱梁在頂推過(guò)程中的受力安全性,并根據(jù)應(yīng)力的分布,得出梁體的彎曲和懸臂段的延伸都不利于梁體的局部受力的結(jié)論;建立臨時(shí)支承體系的受力分析模型,并根據(jù)鋼箱梁的支反力,計(jì)算分析了臨時(shí)支承體系在頂推過(guò)程中結(jié)構(gòu)的受力安全。②分析了小半徑、大縱坡對(duì)鋼箱梁頂推施工的影響:研究了橋梁縱坡變化對(duì)頂推力的影響,提出了大縱坡橋梁頂推防滑移的安全措施;分析了橋梁曲率半徑對(duì)頂推過(guò)程中鋼箱梁橫向和縱向抗傾覆穩(wěn)定性的影響;結(jié)合黃桷灣立交F匝道工程實(shí)際,計(jì)算分析了小半徑、大縱坡鋼箱梁節(jié)段不同拼裝方案下的空間形態(tài),研究了縱坡、曲率影響梁體空間形態(tài)的機(jī)理,并進(jìn)一步探討了彎、坡橋空間形態(tài)的設(shè)計(jì)方法。③分析了等高梁預(yù)拱度的設(shè)置對(duì)頂推施工結(jié)構(gòu)受力的影響,包括對(duì)頂推力的影響,對(duì)鋼箱梁受力的影響,對(duì)臨時(shí)墩受力的影響,對(duì)鋼箱梁與滑道不均勻接觸的影響,及對(duì)鋼箱梁豎向撓度的影響等,對(duì)這些影響進(jìn)行了評(píng)估,并通過(guò)對(duì)比提出了使用帶橡膠墊板的滑道的工程措施以應(yīng)對(duì)這些影響。④分析了小半徑、大縱坡的鋼箱梁跨線頂推施工監(jiān)控的特點(diǎn)、難點(diǎn),提出了頂推施工監(jiān)控中鋼箱梁變形量和橫向偏移量監(jiān)測(cè)評(píng)定的方法,并闡述了黃桷灣立交F匝道鋼箱梁頂推施工監(jiān)控的工程實(shí)踐。
[Abstract]:With the rapid development of transportation in China and the grid development of high-grade roads, all kinds of interchange projects are also increasing day by day. Many of them build overpasses on the basis of existing roads, which leads to a large number of cross-line ramp bridges. Most of these ramp bridges are curved bridges, slope bridges. At the same time, the pushing construction is more and more used in the construction of cross-line bridges due to its small influence on the traffic of existing roads and low requirements on the construction site. Therefore, there is a realistic demand for the research of bridge jacking construction with bending and slope properties. The F-ramp bridge jacking project of Chongqing Huangjuewan interchange project is a typical cross-line project of steel box girder with small radius and large longitudinal slope. On the basis of this project, this paper studies the whole and local stress characteristics of this kind of bridge in the push-up project, and analyzes the influence of small radius and large longitudinal slope on the steel box girder jacking and its spatial shape. The influence of pre-camber setting of equal-height beam on push-up construction is also studied, and the difficulties and key techniques to monitor and control the push-up construction of curved slope bridge are studied. The main work and conclusions of this paper are as follows: (1) the stress analysis model of steel box girder is established by using midas software, and the supporting force of steel box girder is calculated and analyzed. The variation law of vertical deflection and stress of steel box girder in different stages in the process of pushing steel box girder; At the same time, the local model of the steel box girder is established by using the mixed element method. The local stress of the steel box girder in the process of pushing is analyzed, and the stress safety of the steel box girder is evaluated according to the distribution of stress, and the force safety of the steel box girder is evaluated according to the stress distribution. It is concluded that the bending of the beam and the extension of the cantilever are not conducive to the local force of the beam. The stress analysis model of the temporary support system is established, and according to the support force of the steel box girder, the force safety of the temporary support system during the push-up process is calculated and analyzed. (2) the small radius is analyzed. The influence of large longitudinal slope on steel box girder jacking construction: the influence of bridge longitudinal slope change on top thrust is studied, and the safety measures to prevent sliding of bridge roof with large longitudinal slope are put forward. The influence of the curvature radius of the bridge on the lateral and longitudinal anti-overturning stability of the steel box girder during the push-up process is analyzed. Combined with the practice of Huangjuewan interchange F ramp project, the spatial morphology of steel box girder segments with small radius and large longitudinal slope is calculated and analyzed, and the mechanism of the influence of longitudinal slope and curvature on the spatial shape of beam body is studied, and the bending is further discussed. The design method of space shape of slope bridge. 3. The influence of pre-camber of equal-height beam on the force of jacking construction structure is analyzed, including the influence of pushing force, the influence on the force of steel box girder, and the influence on the force of temporary pier. The influence of non-uniform contact between steel box girder and slide and the vertical deflection of steel box girder are evaluated. The engineering measures to deal with these effects are put forward by comparison. (4) the characteristics and difficulties of pushing construction monitoring of steel box girder with small radius and large longitudinal slope are analyzed. The monitoring and evaluating method of steel box girder deformation and lateral offset in pushing construction monitoring is put forward, and the engineering practice of steel box girder pushing construction monitoring on F ramp of Huangjuewan interchange is expounded.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.462

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 張陜鋒;正交異性板扁平鋼箱梁若干問(wèn)題研究[D];東南大學(xué);2006年

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本文編號(hào)：2466053