钢管拱桥管内混凝土真空辅助灌注试验及实桥应用  

Tests of Vacuum-Aided Casting of Concrete in Tubes of a CFST Arch Bridge and Application of the Casting to Actual Bridges

作　　者：韩玉[1,2] 

机构地区：[1]重庆交通大学,重庆400074 [2]广西路桥工程集团有限公司,广西南宁530001

出　　处：《桥梁建设》2015年第2期19-25,共7页Bridge Construction

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。To research into the ways of how to minimize the problem of concrete disengage‐ment in the tubes of concrete‐filled steel tube （CFST ） arch bridge ,the First Hejiang Changjiang River Bridge with a main span of 530 m was taken as the case study ,the models of two large‐scale steel tubes of 50 m length were designed and fabricated ,the tubes were filled in with the concrete respectively by the common and vacuum‐aided casting workmanship and the comparative tests for the models were made .The analysis of the ultrasonic detection results of the tubes filled in with the concrete and the visual comparison of the concrete in the opened tubes proved the effectiveness of the vacuum‐aided casting workmanship .The working mechanism of the workmanship was made clear ,the deficiency of the originally designed workmanship was found out and the improvement for the workmanship was accordingly proposed .The workmanship was improved and was applied to the case study bridge and the construction of the whole process vacuum‐aided casting was real‐ized in reality .T he tests and application of the w orkmanship to the actual bridge also proved that with the workmanship ,the concrete density in the tubes at the concrete casting stages was en‐sured ,the ranges of the concrete disengagement were greatly lessened and the depth of the con‐crete disengagement in the late period was significantly minimized . The working effect of the workmanship was sound ,the workmanship was awarded the patent of invention and was already popularized and applied to 3 major bridges .

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 

分 类 号：TU528.59[建筑科学—建筑技术科学] U445.552[建筑科学—桥梁与隧道工程]