本文關(guān)鍵詞： 鋼筋混凝土拱橋 懸臂澆筑 扣錨系統(tǒng) 扣索布置形式 合理　出處：《重慶交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：我國采用纜索吊裝法和勁性骨架法修建了為數(shù)眾多的大跨徑混凝土拱橋,相比之下,國外混凝土拱橋大多采用懸臂澆筑施工法。鑒于懸臂澆筑法在山區(qū)拱橋建設(shè)中的優(yōu)勢,國內(nèi)也已開展鋼筋混凝土拱橋懸臂澆筑施工的理論研究和工程實踐,至今已在四川和貴州共建成2座大跨度混凝土拱橋。懸臂澆筑施工中,扣錨系統(tǒng)的布置直接影響到主拱圈受力、扣錨索力值以及拱圈線形的控制,但目前缺乏對這方面的系統(tǒng)研究。為此,本文以貴州省交通運輸廳科技項目“掛籃懸澆鋼筋混凝土箱形拱橋設(shè)計與施工關(guān)鍵技術(shù)研究”為依托,以木蓬特大橋為研究對象,圍繞扣錨系統(tǒng)開展以下研究:①收集國內(nèi)外鋼筋混凝土拱橋采用懸臂澆筑施工的扣錨系統(tǒng)構(gòu)造,將扣錨系布置歸結(jié)為扇形布置和星式布置兩種形式。②根據(jù)混凝土拱橋主拱圈在懸臂澆筑施工過程中的受力與變形特點,在分析比較國內(nèi)各種施工控制方法的基礎(chǔ)上,給出了用應力平衡法計算扣錨索力的算法和計算流程。③針對星式和扇形兩種扣錨索布置方式,分別擬定了木蓬特大橋以最大懸臂端扣索取15°、17°、20°、23°的布索方案,開展主拱圈施工階段的截面應力和變形的對比分析研究。④計算結(jié)果表明,位于拱腳區(qū)段的扣索,扣索傾角不宜過大,以確保節(jié)段混凝土澆筑時在拱圈截面中產(chǎn)生壓應力;對其他扣索布置,結(jié)合拱圈截面的受力和線形控制分析,扇形扣索布置中最長扣索水平傾角20°較為合理,星式扣索布置中最長扣索的的水平傾角17°較為合理。
[Abstract]:China adopts the cable hoisting method and stiff skeleton method for construction of long span concrete arch bridge, a large number of contrast, most of the foreign concrete arch bridge cantilever construction method. In view of the advantages of cantilever casting method in arch bridge construction in mountainous area, theoretical research and engineering practice in China has developed the reinforced concrete arch bridge cantilever construction and has been in Sichuan and Guizhou built a total of 2 long-span concrete arch bridge cantilever construction, anchor system layout directly affects the main arch force, buckle anchor force value and control of arch linear, but there is lack of systematic research in this area. Therefore, the science and technology project of Guizhou the Provincial Department of transportation suspending cast reinforced concrete box arch bridge design and construction of key technology research "as the basis, to Mu Peng super large bridge as the research object, the anchor system carries out the following research: 1. Collection Set of reinforced concrete arch bridge with anchor system structure of cantilever construction, the anchor arrangement due to the layout and arrangement of two star fan forms. According to the main arch concrete arch bridge in cantilever construction process of the stress and deformation characteristics, based on comparison of domestic construction control methods on the analysis are given the stress calculation algorithm and calculation process. According to the anchor force buckle and buckle two star fan cable arrangement, were developed in the largest cantilever Mu Peng super large bridge buckle for 15 degrees, 17 degrees, 20 degrees, 23 degrees to carry out the project of laying, section of the main arch ring construction stage should be studied analysis of stress and deformation. Compared the calculation results show that in the arch of the foot section of the cable, cable angle should not be too large, to ensure that the segmental concrete pouring in the arch section in compressive stress; on the other cable layout, combination Analysis of force and alignment control of arch ring section, fan-shaped cable layout in the length of cable horizontal angle of 20 degrees is reasonable, star cable layout of the longest cable angle of 17 degrees is more reasonable.

【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U448.22

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本文編號：1505880