矮塔斜拉橋懸澆施工線形控制研究
發(fā)布時間：2018-11-27 11:30
【摘要】：隨著國家加大對中西部基礎設施建設的投入,越來越多的大跨徑橋梁在我國大地拔地而起。但是跨徑的增加也會給橋梁的設計和施工帶來難度,如主梁和索塔壓應力過高,施工中標高難以控制以及箱梁撓度過大等問題。同時,施工階段結構的變形、截面的應力狀態(tài)是不斷變化的,這對施工質量和施工安全是不利的,而且直接影響到成橋線形與成橋的受力狀態(tài),因此,對大跨徑預應力混凝土斜拉橋來說,進行橋梁線形控制很重要。本文從預應力混凝土斜拉橋的施工控制研究的全面性進行考慮,簡單介紹了預應力混凝土斜拉橋的發(fā)展狀況、結構構造特點、國內外施工控制研究的發(fā)展的重要性。進一步介紹了橋梁施工控制的目的、橋梁施工線形控制的方法及影響橋梁施工線形控制的因素。以安徽省淮南市淮上淮河大橋主梁懸臂現(xiàn)澆施工監(jiān)控的工程案例為背景,詳細的闡述了淮上淮河大橋施工控制的內容、一般理論和方法。其中重點介紹淮上淮河大橋在懸臂施工過程中線形控制在施工控制中施工階段、控制節(jié)點、控制內容,包括混凝土澆筑前后、預應力張拉前后、主橋掛索、合攏順序、臨時支撐拆除、調索對橋梁線形的影響,同時也詳細的敘述了主塔、墩、主橋線形控制的具體監(jiān)控工藝,敘述了應力效應、溫度效應和掛籃預壓對線形有著密不可分的聯(lián)系。運用大型有限元軟件Midas-Civil建立大橋模型,對大橋最大懸臂狀態(tài)、中跨合攏狀態(tài)、成橋后狀態(tài)下進行應力、彎矩、撓度的分析,并且獲得每一號段的預拱度,來指導現(xiàn)場施工。對懸臂澆筑施工過程進行計算機仿真計算并與現(xiàn)場觀測的實際情況相結合,不斷修正模型參數(shù),合理調整下一階段的預拱度,來指導下一階段施工,最終使橋梁順利合攏,達到預期的理想線形效果。
[Abstract]:With the government increasing investment in infrastructure construction in the central and western regions, more and more long-span bridges have emerged in China. However, the increase of span will also bring difficulties to the design and construction of bridges, such as the high compressive stress of the main girder and cable tower, the difficulty of controlling the elevation in construction and the excessive deflection of the box girder. At the same time, the deformation of the structure and the stress state of the section are constantly changing in the construction stage, which is unfavorable to the construction quality and construction safety, and has a direct impact on the shape of the completed bridge and the stress state of the completed bridge. Linear control of long span prestressed concrete cable-stayed bridge is very important. Based on the comprehensive study of construction control of prestressed concrete cable-stayed bridge, this paper briefly introduces the development of prestressed concrete cable-stayed bridge, structural characteristics and the importance of the development of construction control research at home and abroad. The purpose of bridge construction control, the method of bridge construction alignment control and the factors influencing bridge construction alignment control are further introduced. Based on the engineering case of the cantilever cast-in-place construction monitoring of the main girder of Huaishang Huaihe River Bridge in Huainan City of Anhui Province, the contents, general theory and methods of the construction control of the Huai-Shang Huaihe River Bridge are expounded in detail. This paper mainly introduces the linear control of Huaihe River Bridge in the construction stage of construction control, the control node, the control content, including the prestressing tension before and after the concrete pouring, the cable hanging of the main bridge, and the closing sequence. The influence of temporary support removal and cable adjustment on the alignment of the bridge is also described in detail. At the same time, the monitoring technology of the main tower, pier and main bridge linear control is also described in detail. The stress effect, temperature effect and hanging basket preloading are closely related to the alignment. The model of the bridge is established by using the large-scale finite element software Midas-Civil. The stress, bending moment and deflection of the bridge under the condition of the maximum cantilever state, the middle span closing state and the post-completion state are analyzed, and the pre-arch degree of each section is obtained to guide the field construction. The computer simulation calculation of cantilever pouring construction process is carried out and combined with the actual situation observed in the field. The model parameters are constantly revised and the prearch degree of the next stage is adjusted reasonably to guide the construction of the next stage, and finally make the bridge close smoothly. Achieve the desired linear effect.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.4
本文編號：2360583
[Abstract]:With the government increasing investment in infrastructure construction in the central and western regions, more and more long-span bridges have emerged in China. However, the increase of span will also bring difficulties to the design and construction of bridges, such as the high compressive stress of the main girder and cable tower, the difficulty of controlling the elevation in construction and the excessive deflection of the box girder. At the same time, the deformation of the structure and the stress state of the section are constantly changing in the construction stage, which is unfavorable to the construction quality and construction safety, and has a direct impact on the shape of the completed bridge and the stress state of the completed bridge. Linear control of long span prestressed concrete cable-stayed bridge is very important. Based on the comprehensive study of construction control of prestressed concrete cable-stayed bridge, this paper briefly introduces the development of prestressed concrete cable-stayed bridge, structural characteristics and the importance of the development of construction control research at home and abroad. The purpose of bridge construction control, the method of bridge construction alignment control and the factors influencing bridge construction alignment control are further introduced. Based on the engineering case of the cantilever cast-in-place construction monitoring of the main girder of Huaishang Huaihe River Bridge in Huainan City of Anhui Province, the contents, general theory and methods of the construction control of the Huai-Shang Huaihe River Bridge are expounded in detail. This paper mainly introduces the linear control of Huaihe River Bridge in the construction stage of construction control, the control node, the control content, including the prestressing tension before and after the concrete pouring, the cable hanging of the main bridge, and the closing sequence. The influence of temporary support removal and cable adjustment on the alignment of the bridge is also described in detail. At the same time, the monitoring technology of the main tower, pier and main bridge linear control is also described in detail. The stress effect, temperature effect and hanging basket preloading are closely related to the alignment. The model of the bridge is established by using the large-scale finite element software Midas-Civil. The stress, bending moment and deflection of the bridge under the condition of the maximum cantilever state, the middle span closing state and the post-completion state are analyzed, and the pre-arch degree of each section is obtained to guide the field construction. The computer simulation calculation of cantilever pouring construction process is carried out and combined with the actual situation observed in the field. The model parameters are constantly revised and the prearch degree of the next stage is adjusted reasonably to guide the construction of the next stage, and finally make the bridge close smoothly. Achieve the desired linear effect.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.4
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