珠江黄埔大桥移动模架造桥机施工技术.rar

珠江黄埔大桥移动模架造桥机施工技术

1、工程概况
广州珠江黄埔大桥S12合同段是珠江黄埔大桥南汊桥的引桥，起点为70#墩，终点为121#桥台，桥梁全长1788米。大桥梁部为17-45m＋34-30m一联多跨的连续刚构、连续-刚构箱梁，连续梁为双幅单箱单室断面、纵横双向预应力砼结构，全部采用移动模架法逐孔现浇，箱梁节段间预应力筋采用连接器接长；45米跨墩身为花瓶形独墩，30米跨为双柱形墩身；基础采用钻孔灌注桩，上设承台。
大桥单幅桥面宽度为16.6米，45米跨梁高2.5米，底宽7.5米，30米正常跨梁高1.8米，底宽7.9米，过渡跨梁高、底宽分别由2.5米、7.5米渐变到1.8米、7.9米。大桥位于R=4000m的圆曲线及缓和曲线上，桥面自起点（70#墩）向终点（121#桥台）设置2%的纵坡。
2、移动模架的选型和制作
2.1 移动模架的选型
大桥墩柱高度从4.12m-35.8m不等，45米跨最长浇筑长度51.1米，钢筋砼重量1606吨，30米跨最长浇筑长度33.07米，钢筋砼重量979吨。大桥共投入三套移动模架，45米跨及30米过渡跨由一套移动模架从70#墩开始施工至88#墩，共施工36孔；30米正常跨由两套移动模架从121#桥台开始施工至88#墩，每套模架施工33孔。
2.1.1 上行式、下行式选择
移动模架又称滑动模板支架系统（Movable Scaffolding System）、MSS造桥机，按行走主桁梁与连续梁的相对位置可分为上行式移动模架和下行式移动模架。上行式移动模架主梁支撑在已成梁和墩顶上，不需要墩旁托架，但其墩上支撑及模板悬挂系统较为复杂庞大，对斜交桥及曲线半径较小的桥特别适用，造价较高。下行式移动模架采用两个支撑在牛腿上的钢结构主梁支承模板系统，两主梁坐在墩旁牛腿托架上，牛腿通过销孔或钢支墩固定在桥墩或支撑承台基础上，构造相对简单
Pearl River Huangpu Bridge with movable machine construction technology

1, Project Overview
Guangzhou Pearl River Huangpu Bridge Contract Section S12 South Branch of the Pearl River Huangpu Bridge Bridge Approach, from Pier 70 #, 121 # end abutment, the bridge length 1788 meters. Department of Large Bridge 17-45m +34-30 m a joint multi-span continuous rigid frame, continuous - rigid frame box girder, continuous beam for the two-site single-box single section, vertical and horizontal two-way prestressed concrete structures, all with moving mode-by-hole cast, prestressed box girder segments in length with connectors connected; 45 m Span Pier as a unique vase-shaped pier, 30 meters across the two-column pier; basis using bored piles, on the set cap.
Single bridge deck width of 16.6 m, 45 m high 2.5 m span beams, bottom width 7.5 meters, 30 meters in the normal cross-beam 1.8 m, bottom width 7.9 m, the transition cross-beam high, bottom width by 2.5 m, 7.5 m gradient to 1.8 meters, 7.9 meters. Bridge located on the circular curve R = 4000m and gentle curve, the bridge from the starting point (70 pier) to finish (121 # bridge abutment) set a 2% longitudinal slope.
2, movable type selection and production
2.1 Selection of movable frame
Bridge Pier height ranging from 4.12m-35.8m, 45 m across the longest length of 51.1 meters poured, reinforced concrete weighing 1606 tons, 30 meters across the longest length of 33.07 meters poured, reinforced concrete weighing 979 tons. Bridge invested a total of three sets of movable frame, 45 m and 30 m across the transition across a set of movable frame from the pier to commence from 70 to 88 pier, 36-hole total of construction; 30 meters of the normal inter-frame from the two sets of movable 121 # to 88 to start construction of abutment pier, each mold construction 33 holes.
2.1.1 Upward, downward Selection
Moving mode, also known as sliding template stent system (Movable Scaffolding System), MSS bridge-building machine, by moving the main girder and the relative position of a continuous beam can be divided into uplink and downlink Mobile Scaffold Mobile Scaffold. Upward moving mode has become the main beam supporting the roof beams and piers, no pier next to the bracket, but the pier on the support and suspension system is more complex template large radius curve on the skew bridge and the bridge especially suitable for smaller, cost higher. Movable mold with two supporting steel structure in the bracket on the main beam supporting the template system, two main beam sitting on the pier next to the corbel brackets, corbels or steel strut through the pin hole in the bridge pier or support fixed commitments Taiwan based on the relatively simple structure