C50自密实钢管混凝土施工技术研究与应用  

Construction technology research and application of C50 self-compacting steel tube-confined concrete

作　　者：张海霞 崔鑫 王龙志 李金龙 范兆付 

机构地区：[1]山东建泽混凝土有限公司,山东济南250101 [2]中国建筑土木建设有限公司,北京100068

出　　处：《混凝土》2016年第2期153-156,共4页Concrete

摘　　要：南水北调工程河南庞村钢管混凝土无推力系杆拱桥项目设计采用C50高强、微膨胀、自密实混凝土灌注施工,混凝土灌注施工工艺为顶升法。通过优选骨料级配、使用微膨胀剂、高效减水剂等措施优化混凝土配合比,制备出性能参数符合顶升法施工要求的C50自密实钢管混凝土。混凝土灌注施工中,通过控制混凝土生产和运输,保证混凝土的连续灌注;通过清洗钢管、预灌砂浆、灌注节奏的控制,保证了混凝土与钢管的黏结与饱满;通过覆盖湿润的养护布连续养护14 d,保证了钢管混凝土的强度的顺利发展,通过以上措施的综合应用,经敲击法检验,混凝土于钢管内黏结牢靠、无缺陷、强度发展正常。Pang village steel tube - confined concrete without thrust tied arch bridge project in Henan of South to North Water Diversion Project design pouting construction by using the C50 high strength, micro expansive, self - compacting concrete, the construction tech- nology of concrete pouring for lift -up method.Through optimizing aggregate gradation, using micro expansive agent and superplastici- zer and other measures to optimize mix of concrete,prepared C50 self- compacting steel tube -confined concrete, whose performance parameters meet the requirements of the lift - up method construction.In concrete pouting construction, through the control of concrete production and transportation to guarantee continuous pouting concrete. Through cleaning pipe, pre -pouring mortar, controlling perfu- sion rhythm to ensure the bond between concrete and steel tube with full.Through coveting wet curing cloth and continuous curing 14 d to guarantee the smooth development of the strength of the steel tube - confined concrete. Through the integrated application of the a- bove measures, the concrete in steel tube bonds solid, no defects, strength normal development by the percussion method testing.

关 键 词：自密实 钢管混凝土 微膨胀 顶升法 施工技术 

分 类 号：TU528.59[建筑科学—建筑技术科学]