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苏州轨道交通工程超长梁板结构裂缝控制关键技术
作者：王德民1，郭耀雄2，潘玮璠2，谷亚军2，方博1，辜振睿1
（1.武汉三源特种建材有限责任公司，湖北 武汉 430083；
2.苏州市轨道交通集团有限公司，江苏 苏州 215004）
2.苏州市轨道交通集团有限公司，江苏 苏州 215004）
摘要：高性能膨胀剂具有早期膨胀能大、水化反应需水量小的特点，用其配制的补偿收缩混凝土在合理的浇筑施工和养护措施下，能够大幅度提高轨道交通工程超长梁板结构的裂缝控制效果。试验结果表明，在苏州轨道交通工程胥口车辆段上盖二层梁板混凝土内温度修正后微应变在3 d内达到最大值（+50~+100 με），在30 d后降至-100~-20 με，膨胀组分在早期产生的膨胀量逐步被混凝土的自收缩和干燥收缩所消耗，起到了补偿早期部分收缩量的作用；二层板内温度修正后微应变在30 d后较二层梁内减小约50 με，薄板结构在各项约束条件下收缩更大，更易产生收缩裂缝。
关键词：地铁车辆段；超长梁板结构；补偿收缩混凝土；高性能膨胀剂；微应变
中图分类号：TU528.37 文献标识码：A 文章编号：1001-702X（2022）01-0049-04
Key technology for crack control of super-long beam-slab structure in Suzhou rail transit engineering
WANG Demin1，GUO Yaoxiong2，PAN Weifan2，GU Yajun2，FANG Bo1，GU Zhenrui1
（1.Wuhan Sanyuan Special Building Materials Co. Ltd.，Wuhan 430083，China；
2.Suzhou Rail Transit Group Co. Ltd.，Suzhou 215004，China）
Abstract：High performance expansive agent has the characteristics of large early expansion energy and small hydration reaction water requirement. Under reasonable pouring construction and maintenance measures，shrinkage-compensating concrete prepared by high performance expansive agent can significantly improve crack control effect of super-long beam-slab structure in rail transit engineering. The results show that temperature correction microstrain of second beam plate concrete in upper cover of Xukou car depot reached maximum +50~+100 με in 3 days，and decreased to -100~-20 με after 30 days. The early expansion of expansive components which consumed by autogenous shrinkage and drying shrinkage of concrete had the effect of compensation for the early partial shrinkage. The temperature correction microstrain of second plate was about 50 με lower than second beam after 30 days. The shrinkage of thin plate structure is larger under various constraints，and it is more likely to produce shrinkage cracks.
Key words：metrocar depot，super-long beam-slab structure，shrinkage-compensating concrete，high performance expansive agent，microstrain