【摘要】：對于橋梁建設來說，每一種橋型的發(fā)展都是橋梁界的一場革命。鋼管混凝土拱橋一出現(xiàn)，就得到了橋梁界的廣泛認可和偏愛。鋼管與混凝土的結合，把兩種材料的優(yōu)勢發(fā)揮到了極致。鋼管混凝土拱肋的施工方便，省去了以往鋼筋混凝土拱肋施工時要搭設支架和模板這道工序。鋼管混凝土自重輕、施工方便、施工周期短等等這些優(yōu)點都確立了它在橋梁界不可撼動的地位。鋼管混凝土拱橋在大、中跨徑橋梁中很有競爭力。尤其是在城市橋梁中，其外形美觀、施工工期短等優(yōu)點足以使它從各種橋型中脫穎而出成為優(yōu)勝方案。隨著轉體施工的發(fā)展，鋼管混凝土拱橋在跨越運輸任務繁忙的既有線路、在山區(qū)跨越懸崖時，它都能發(fā)揮出其獨特的優(yōu)勢，能夠產(chǎn)生顯著的社會效益和經(jīng)濟效益。 隨著鋼管混凝土拱橋運營時間的增加，它的一些缺點也逐漸暴露出來，尤其是拱橋吊桿的破壞。拱橋吊桿的實際壽命遠達不到設計的使用壽命，由于吊桿防護和外力的破壞等原因，使得吊桿過早的結束了壽命，而建造新橋的成本太高，為了節(jié)省資源，不得不對橋梁進行加固，更換破損的吊桿。因此，研究鋼管混凝土拱橋吊桿的破壞和吊桿更換非常迫切。 本文先對鋼管混凝土拱橋吊桿破損原因進行分析，并提出了相應的解決措施。然后從吊桿更換施工技術入手，對背景工程項目101.4米中承式鋼管混凝土拱橋吊桿更換施工方法、施工控制以及施工中的關鍵問題進行了詳細討論和研究。本文主要進行了以下工作：第一，對吊桿的破損機理進行深入分析，并提出相應的防護措施。第二，介紹了鋼管混凝土拱橋吊桿更換施工方法，對背景工程吊桿更換施工方案、各項技術標準作出了詳細的說明，提出了施工時需注意的事項，，保證背景工程項目吊桿更換的順利進行。第三，根據(jù)背景工程的特點和施工步驟，進行了詳細的施工過程有限元仿真計算。通過施工過程有限元仿真計算，對施工過程中橋面標高變化、吊桿索力變化進行了分析，研究了實際施工與有限元仿真模擬結果存在誤差的原因，并對吊桿更換施工工作提出了建議和意見。 我國在上世紀九十年代修建的鋼管混凝土拱橋的吊桿破損問題越來越嚴重，很多橋由于吊桿的破壞必須對吊桿進行更換。我們應該看到，在這樣的情況下，吊桿更換施工工藝對于確保交通運輸?shù)陌踩珪惩ㄓ兄黠@的社會效益，擁有廣闊的應用前景。
[Abstract]:For bridge construction, each kind of bridge development is a revolution in bridge field. As soon as concrete filled steel tubular arch bridge appears, it is widely recognized and favored by bridge circle. The combination of steel tube and concrete exerts the advantages of the two materials to the extreme. The construction of concrete-filled steel tube arch rib is convenient, which saves the working procedure of erecting support and formwork in the previous construction of reinforced concrete arch rib. The advantages of concrete filled steel tube (CFST), such as light weight, convenient construction and short construction period, have established its unshakable position in the bridge boundary. Concrete-filled steel tubular arch bridge is very competitive in large and medium span bridges. Especially in the city bridge, its appearance is beautiful, the construction period is short and so on. With the development of rotary construction, concrete filled steel tubular arch bridge is able to display its unique advantages in crossing the existing lines with heavy transportation tasks, and when crossing cliffs in mountainous areas, which can bring about remarkable social and economic benefits. With the increase of operation time of concrete-filled steel tubular arch bridge, some shortcomings are gradually exposed, especially the damage of arch bridge suspenders. The actual life of the arch bridge suspension is far from the designed service life. Because of the protection of the boom and the damage of the external force, the suspender ends its life prematurely, and the cost of building the new bridge is too high, in order to save resources, The bridge had to be strengthened and the damaged hanger replaced. Therefore, it is urgent to study the damage and replacement of suspenders of concrete-filled steel tubular arch bridge. In this paper, the causes of suspension failure of concrete-filled steel tubular arch bridge are analyzed, and the corresponding solutions are put forward. Then, starting with the construction technology of suspender replacement, the paper discusses and studies in detail the construction method, construction control and key problems in the construction of 101.4 m through steel tubular arch bridge in background engineering project. The main work of this paper is as follows: first, the damage mechanism of the boom is deeply analyzed, and the corresponding protective measures are put forward. Secondly, the paper introduces the construction method of suspender replacement of concrete-filled steel tube arch bridge, explains the construction scheme of suspender replacement in background engineering, each technical standard in detail, and puts forward the matters needing attention in construction. To ensure the smooth replacement of the suspender in the background engineering project. Thirdly, according to the characteristics and construction steps of the background engineering, the finite element simulation calculation of the construction process is carried out in detail. Through the finite element simulation calculation of the construction process, the variation of the bridge deck elevation and the cable force of the suspension rod during the construction process is analyzed, and the reasons for the error between the actual construction and the finite element simulation results are studied. Suggestions and suggestions are put forward for the replacement of suspenders. The damage problem of suspenders of concrete-filled steel tubular arch bridges built in 1990s in China is more and more serious. Many bridges must replace the suspenders because of the damage of suspenders. We should see that under such circumstances, the replacement construction technology of suspenders has obvious social benefits to ensure the safety and smooth transportation, and has a broad application prospect.
【學位授予單位】：華東交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.22;U445.7

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