夜郎湖大桥劲性骨架外包混凝土浇筑方式与控制技术研究

发布时间：2018-01-04 22:35

本文关键词：夜郎湖大桥劲性骨架外包混凝土浇筑方式与控制技术研究　出处：《重庆交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着桥梁施工技术的发展,新工艺及新材料的出现,为钢筋混凝土拱桥向着大跨径方向发展提供了良好的机遇。悬臂浇筑与劲性骨架组合施工技术在国外已经被推广运用,该方法弥补了单一施工方法的不足,对混凝土拱桥向大跨径方向发展有巨大的推动作用。国内劲性骨架施工法已经达到世界先进水平,采用悬臂浇筑法修建了3座拱桥,但悬臂浇筑与劲性骨架组合施工法尚未得到运用,因此缺乏相关的施工与控制技术经验。本文围绕悬臂浇筑与劲性骨架组合施工法展开以下工作:1 收集国外采用悬臂浇筑与劲性骨架组合施工拱桥相关资料,借鉴已有的施工及控制经验,再结合本文研究对象,拟定出一套可行的施工方案,即:在两拱脚侧各74.24m范围内采用斜拉扣挂悬臂浇筑法施工,跨中30.73m采用劲性骨架法施工,骨架外包混凝土采用整节段浇筑法施工。2 基于一次浇筑一次张拉,对改进的应力平衡法在算法上做进一步改进,以施工过程中拱圈截面上、下缘拉应力为控制目标,一次性求解出扣索力可行域,使求解过程更加简单快捷。3 随着悬臂段的增大,施工过程中已浇筑成型拱圈截面应力可能会超出控制范围,因此本文提出了索力累计增量法,能够在施工过程中预先判定需要拆除的扣索号,通过拆索的方式调整拱圈截面应力,达到一次浇筑一次张拉的目的。4 本文探讨了劲性骨架外包混凝土整节段浇筑法施工法,并将改进的应力平衡法推广到劲性骨架外包混凝土浇筑施工控制计算中去。该方法能够反应外包混凝土浇筑对悬浇段拱圈受力的影响,既能控制悬浇段拱圈截面应力,又能控制外包混凝土的应力。
[Abstract]:With the development of bridge construction technology, new technology and new materials appear. It provides a good opportunity for the reinforced concrete arch bridge to develop to the direction of long span. The cantilever pouring and rigid skeleton combined construction technology has been popularized and applied abroad, which makes up for the shortage of single construction method. The method of rigid skeleton construction has reached the advanced level in the world, and three arch bridges have been built by cantilever pouring method. However, the method of cantilever pouring and rigid skeleton combined construction has not been used. Therefore, there is a lack of relevant experience in construction and control technology. The following work is carried out around the cantilever pouring and stiffening skeleton combined construction method. The following work is carried out in this paper: 1. Collect the relevant data of arch bridge construction using cantilever pouring and rigid skeleton combination construction abroad. Referring to the existing experience of construction and control, and combining with the research object of this paper, a set of feasible construction plan is worked out, that is, the construction method of cantilever with inclined buckle and hanging arm is adopted within 74.24m of each side of two arch feet. In the middle of the span 30.73m, the rigid skeleton method is used, and the whole section pouring method is used to construct the skeleton outlay concrete. 2. The improved stress balance method is further improved on the algorithm based on the one-time pouring and one tensioning method. Taking the tension stress at the lower edge of the arch ring section as the control target during the construction process, the feasible region of the buckling force is solved at one time, which makes the solution process simpler and faster with the increase of the cantilever section. During the construction process, the stress of the section of the formed arch ring may exceed the control range, so this paper puts forward the cumulative increment method of cable force, which can determine in advance the number of the buckle that needs to be removed during the construction process. The stress of arch ring section is adjusted by the way of disassembling cables, and the purpose of once pouring and one stretch is achieved. 4. This paper discusses the construction method of the whole section pouring method of the stiffened skeleton encased concrete. The improved stress balance method is extended to the calculation of the construction control of the external concrete pouring of the rigid skeleton. This method can reflect the influence of the outsourced concrete pouring on the stress of the arch ring in the cantilever section. It can not only control the stress of the arch ring in the overcast section, but also control the stress of the concrete.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445.57

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