中小跨径连续梁桥分条分块顶推新技术研究.pdf

华东交通大学
硕士学位论文
中小跨径连续梁桥分条分块顶推新技术研究
姓名:宋秀峰
申请学位级别:硕士
专业:道路与铁道工程
指导教师:陈梦成;上官兴
20080418
摘要
中小跨径连续梁桥分条分块顶推新技术研究
摘要
顶推法施工是预应力混凝土连续梁桥的一种最经济的方法,然而在中小跨径中却很
难得到推广。分析其原因是顶推预应力设计的独特性和工艺的复杂性。因此立项研究对
于普及和推广性能优秀的连续梁来代替落后的简支梁具有重要的现实意义。
湖南省南县哑吧渡大桥是交通部“八五”行业联合科技攻关项目中的一座实验桥。该
桥首创分条、分块连续梁顶推施工新工艺。在 90 年代初的中国修建地方公路的高潮中,
大多数施工单位没有大型吊装设备,迫切需要一种新技术来解决连续梁桥修建的困难。
哑吧渡大桥采用薄壁箱梁材料用量与简支梁的 T 梁相当,250m 长、重每条 1000t 的连
续梁顶推架设只需一台 100t 连续千斤顶的事实极大解放了人们的思想。用技术的创新来
促进桥梁的发展,争取经济效益是一条光明之路。
本文从对哑吧渡大桥的研究入手,全面系统介绍该桥箱梁的制做和架设方法,对其
预应力设计和结构强度进行复核。期望能通过对该桥中所采用的Ф7 平行钢丝、HM21
锚和“通索+割索”的顶推预应力设计新方法的研究,形成中小跨径连续梁桥顶推设计
的新理念。
利用哑吧渡实验桥的成果,对常规简支“T 梁”和“小箱梁”结构进行改造,完成
分条分块顶推设计,以期为中小跨径连续梁桥装配化顶推施工的发展提供参考。
关键词:中小跨径,连续梁,分条分块顶推,预应力设计新方法。
III
Abstract
The research of the Incremental launching method which
dividing the longitudinal beams and the cross beams in
Middle-Small span continuous Bridges
ABSTRACT
The method of Incremental launching is one of the most economical measure of
prestressed concrete continuous beam bridge. But it’s not widely applied in medium-small
span bridge for its characteristic in designing plexity of technology. Thus, it has very
important significance in the research of popularizing and spreading the advanced continuous
beam to instead the low-grade simple-supported beam on bridge.
Yabadu Bridge in Hunan Province was one of the experimental bridges in “Eight-Five
Industry Technological research” project. This bridge used the method of Incremental
launching by dividing the longitudinal and cross beams for the first time in china. In the
highway construction current of the beginning of 90’s in china, the building departments
badly require the new method to solve the difficulty in continuous beam bridge building for
lacking the big sling facilities. The Yabadu Bridge adopted the equivalent material of box
paring with the T-box beams which were used in simply-supported girder bridge.
The fact that the beam : 250 meters long and 1000t