大跨径预应力混凝土连续梁桥无跨中临时墩顶推施工技术研究

发布时间：2018-03-10 18:38

本文选题：大跨径连续梁桥　切入点：钢斜撑　出处：《浙江工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：顶推施工法具有占用桥下通道少、施工设备比较简单、作业机械化程度高、费用投入低、工程质量稳定、施工安全可靠等特点,已经成为中小跨连续梁桥的主要施工方法之一。论文研究目的是将成熟的中小跨径连续梁桥顶推技术推广到大跨径连续梁桥中,而且无需设置跨中临时墩,使其能适应通航孔的施工,从而促进桥梁施工技术的发展。论文首先,对当前连续梁桥施工技术存在的问题和顶推技术在通航孔连续梁中推广难的原因进行了分析,并提出了在桥墩上设置钢斜撑来取代跨中河道内搭建临时墩的方法,以进一步缩短顶推跨径。其次,以江西省南昌市洪都大桥北主桥辅通航孔5×64m的预应力混凝土连续等截面箱梁桥施工为背景,开展了钢斜撑顶推方案的结构设计和施工工艺研究,同时进行了施工和成桥阶段详细的结构计算分析,并论证了此方案的可行性。最后,对该桥分别采用顶推施工法和悬臂浇筑法,进行了两种方案的技术和经济对比分析。论文研究结果表明：大跨径预应力混凝土连续梁桥中采用无跨中临时墩的顶推施工技术是可行的,而且比当前较常用的悬臂浇筑施工技术在施工质量、安全、进度及成本控制等方面的综合表现具有更好的实用性和先进性,可以在大跨径预应力混凝土连续等截面箱梁桥施工中推广应用。
[Abstract]:The push-push construction method has the characteristics of less occupied channels under the bridge, simple construction equipment, high degree of mechanization, low cost, stable engineering quality, safe and reliable construction, etc. It has become one of the main construction methods of small and medium span continuous beam bridge. The purpose of this paper is to extend the mature pushing technology of medium and small span continuous beam bridge to long span continuous beam bridge, and it is not necessary to set temporary pier in middle span. So that it can adapt to the construction of navigation holes, thus promoting the development of bridge construction technology. First of all, the paper analyzes the problems existing in the construction technology of continuous beam bridges and the reasons why it is difficult to popularize the technology of jacking and pushing in continuous beams of navigation holes. And put forward the method of installing steel inclined brace on the pier to replace the temporary pier in the middle span channel, so as to further shorten the jacking and pushing span. Secondly, Based on the construction of prestressed concrete continuous box girder bridge with auxiliary navigation hole of 5 脳 64m in the north main bridge of Hongdu Bridge, Nanchang City, Jiangxi Province, the structural design and construction technology of steel inclined brace jacking scheme are studied. At the same time, the detailed structural calculation and analysis of the construction and the completion of the bridge are carried out, and the feasibility of the scheme is demonstrated. Finally, the jacking construction method and the cantilever pouring method are used respectively for the bridge. The technical and economic comparison and analysis of the two schemes are carried out. The results of the paper show that it is feasible to use the non-span temporary pier in the construction of the long-span prestressed concrete continuous beam bridge. Moreover, it is more practical and advanced than the cantilever pouring construction technology in the aspects of construction quality, safety, schedule and cost control. It can be widely used in the construction of long span prestressed concrete continuous box girder bridge with equal section.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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