钢管拱桥管内混凝土真空辅助灌注试验及实桥应用

发布时间：2018-02-28 14:08

本文关键词： 拱桥钢管混凝土结构管内混凝土真空辅助灌注桥梁施工　出处：《桥梁建设》2015年02期 　论文类型：期刊论文

【摘要】：为研究如何减小钢管混凝土拱桥管内混凝土脱空问题,依托主跨530m的合江长江一桥,设计并完成了2条长达50m的大型钢管模型对比试验,试验中分别采用常规和真空辅助灌注工艺完成钢管混凝土的灌注。通过对试验管的超声波检测结果对比分析和将试验管剖开直观对比观察管内混凝土,证明了真空辅助工艺的有效性;摸清了其工作机理;发现了原设计真空辅助工艺的不足并提出改进方法。将改进后的真空辅助灌注工艺应用于依托工程,真正实现了全过程真空辅助灌注施工。试验及实桥应用证明:该工艺保证了管内混凝土灌注阶段的密实性,并大大减少后期脱空范围、显著减小后期脱空深度,效果良好,获得了发明专利,已推广应用于3座特大桥。
[Abstract]:In order to study how to reduce the concrete void in the pipe of the concrete-filled steel tube arch bridge, two large-scale steel pipe model comparative tests with 50 m long were designed and completed based on the 530m main span of the first bridge of the Hejiang Yangtze River. In the experiment, the concrete filled with steel tube was completed by conventional and vacuum assisted pouring technology, and the concrete in the tube was observed by comparing and analyzing the ultrasonic test results of the test tube and dissecting the test tube. It is proved that the vacuum assistant process is effective, the working mechanism is clear, the shortcomings of the original design vacuum assistant process are found and the improvement method is put forward. The improved vacuum assisted perfusion process is applied to the supporting engineering. The experiment and the application of the real bridge show that the technology can ensure the compactness of the concrete pouring stage in the pipe, and greatly reduce the void range in the later stage, and obviously reduce the void depth in the later stage, and the effect is good. The invention patent has been obtained and has been popularized and applied to 3 large bridges.
【作者单位】：重庆交通大学;广西路桥工程集团有限公司;
【分类号】：U448.22

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