高原地区铁路预制混凝土梁开裂问题原因分析与控制措施研究
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摘要
针对高原地区铁路预制梁开裂的几种常见形式,从环境因素、材料因素、结构因素和工艺因素角度分析了其开裂的原因。提出了优化混凝土原材料品质与配合比、采取保温及保湿养护方式、增设防裂钢板网、改进拆模工艺等措施来降低预制梁体混凝土非荷载收缩开裂及降低受到外荷载应力开裂的风险,并在实际工程中取得了良好的效果。
Aimed at the common cracking forms of the railway prefabricated beams in the plateau region were researched, the causes of cracking were analyzed from environmental factors, material factors, structural factors and technological factors. The measures of improving the concrete raw materials quality, optimizing the concrete mix proportion,implementing the curing methods of warm and humidity keeping, adding anti-crack steel mesh and improving the mold removal process were put forward, which had a significant effect on reducing the risk of non-load shrinkage cracking and external load stress cracking of prefabricated concrete beam and showed a good cracking control results in the actual engineering.
Aimed at the common cracking forms of the railway prefabricated beams in the plateau region were researched, the causes of cracking were analyzed from environmental factors, material factors, structural factors and technological factors. The measures of improving the concrete raw materials quality, optimizing the concrete mix proportion,implementing the curing methods of warm and humidity keeping, adding anti-crack steel mesh and improving the mold removal process were put forward, which had a significant effect on reducing the risk of non-load shrinkage cracking and external load stress cracking of prefabricated concrete beam and showed a good cracking control results in the actual engineering.
引文
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[2]郑健.中国高速铁路桥梁[M].北京:高等教育出版社,20081-13,622-719.
[3]孙文彬,田洪斌,王锦力.装配预制梁抗弯承载力试验研究[J].工业建筑,2015,45(2):57-61.
[4]宰国军,周志祥.预制梁存放过程中裂缝成因分析[J].重庆交通大学学报:自然科学版,2007,26(6):38-42.
[5]高坤.温度及施工工艺对预制预应力T梁裂缝的影响[J]建筑施工,2016,38(1):107-109.
[6]缪昌文,刘建忠,田倩.混凝土的裂缝与控制[J].中国工程科学,2013,15(4):30-35.
[7]Burrows R W.混凝土的可见与不可见裂缝[M].廉慧珍译北京:中国水利水电出版社,2013.
[8]Liu J P,Tian Q,Miao C W.Investigation on the plastic shrinkage of cementitious materials under drying conditions:mechanism and theoretical model[J].Magazine of Concrete Research,2012,64(1):1-11.
[9]高丹盈.钢纤维混凝土设计与应用[M].北京:中国建筑工业出版社,2002:50-52.