巫山长江大桥钢管混凝土配合比设计与施工  

Design and construction technology of steel tube-confined concrete of the wushan yangtze river bridge

作　　者：丁庆军[1] 彭艳周[1] 何永佳[1] 胡曙光[1] 王铭琪[2] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,湖北武汉430070 [2]四川省路桥公司,四川成都610041

出　　处：《混凝土》2006年第10期61-64,共4页Concrete

摘　　要：介绍了世界第一跨度巫山长江大桥钢管混凝土的配合比设计方法与施工工艺。所设计的混凝土泵送顶升施工性能好、高强、早强和微膨胀。混凝土拌合物初始坍落度23cm,4h坍落度19cm,3d抗压强度56MPa,达设计强度的90%以上,28d抗压强度79MPa,弹性模量4.6×104MPa,核心混凝土自应力为3.6MPa。采用锤击、超声波与钻芯取样等检测方法对主拱钢管混凝土进行检测,结果表明,钢管内混凝土密实,且与钢管壁无脱粘现象,满足工程设计要求。The mixture proportion and construction technology of the steel tube-confined concrete of the Wushan Yangtze River Bridge, which took the first steel span in the world, was introduced in this paper. The worksite construction showed the concrete had some properties such as perfect workability, very high strength at the later stage and the early stage, compensating shrinkage. The slump of fresh concrete mixture was 23cm and flowability was higher than 60cm, those meet the needs of requirements of concrete pumping techniques. The 3d compressive strength reaches 90% of designed strength and the 28d compressive strength and the modulus of elasticity are 79MPa and 4.6×10^4MPa, respectively. Furthermore, the self-stress of the core concrete is 3.6MPa. The hammer-beating detecting, ulwasonic-detecting and boring core-detecting showed that the concrete filled in the tubes and sewed planks was very dense and there wasn＇t crack between concrete and steel tube or concrete and sewed planks, which showed that the combination configuration was fine and meet the needs of the engineering requirements.

关 键 词：钢管混凝土 泵送 配合比 施工 

分 类 号：TU528.59[建筑科学—建筑技术科学]