桥梁大体积混凝土水化热的施工影响因素分析
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摘要
为了分析桥梁大体积混凝土施工工艺对水化热的影响因素,文中采用数值分析的方法对不同混凝土入模温度、冷却水管布置间距、混凝土浇筑间隔时间对大体积混凝土水化热的影响情况进行了对比分析,结果表明降低混凝土入模温度、适当减小冷却水管布置间距、施工工期允许条件下增大混凝土分层浇筑的时间间隔,可以有效降低混凝土内外的温度差,减小混凝土内部的温度应力,缓减内部裂缝的产生。
In order to analyze the influencing factors of hydration heat in mass concrete construction process of bridges, in this paper, numerical analysis method is used to compare and analyze the influence of different concrete injection temperature, cooling pipe spacing and concrete pouring interval on hydration heat of mass concrete. The results show that reducing the temperature of concrete injection, appropriately reducing the distance between cooling water pipes and increasing the time interval of layered concrete placement under the permissible construction period can effectively reduce the temperature difference between inside and outside of concrete, and reduce the temperature stress inside concrete and slow down the generation of internal cracks.
In order to analyze the influencing factors of hydration heat in mass concrete construction process of bridges, in this paper, numerical analysis method is used to compare and analyze the influence of different concrete injection temperature, cooling pipe spacing and concrete pouring interval on hydration heat of mass concrete. The results show that reducing the temperature of concrete injection, appropriately reducing the distance between cooling water pipes and increasing the time interval of layered concrete placement under the permissible construction period can effectively reduce the temperature difference between inside and outside of concrete, and reduce the temperature stress inside concrete and slow down the generation of internal cracks.
引文
[1]刘明光,常向阳.浅议公路桥梁在我国的发展趋势[J].科技信息,2009,(5):691.
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[4]康志田,余开彪.大体积混凝土温度应力监测与裂缝控制研究[J].交通科技,2011,(4):60-62.
[5]杨慧,刘军来.某斜拉桥承台大体积混凝土水化热温度场研究与关键施工技术应用[J].公路工程,2018,43(5):152-156.
[6]朱伯芳.大体积混凝土温度应力与温度控制[M].北京:中国电力出版社,1999.
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[8]朱岳明,徐之青,等.混凝土水管冷却温度场的计算方法[J].长江科学院院报,2003,20(2):19-21.
[9]王解军,梁锦锋,王明明.连续刚构桥承台施工中的温度分析[J].中南公路工程,2005,30(4):86-90.
[10]牛建丰.高墩大跨桥梁大体积混凝土水化热分析研究[D].重庆:重庆大学,2013.
[11]大体积混凝土施工规范(GB 50496-2009)[S].北京:中国计划出版社,2009.
[2]杨培诚,李志成.基于MIDAS/CIVIL的C40大体积混凝土施工期仿真分析[J].公路工程,2012,(1).
[3]徐天良,刘明,丁志文.大体积混凝土温控研究与分析[J].公路工程,2013,38(5):151-156.
[4]康志田,余开彪.大体积混凝土温度应力监测与裂缝控制研究[J].交通科技,2011,(4):60-62.
[5]杨慧,刘军来.某斜拉桥承台大体积混凝土水化热温度场研究与关键施工技术应用[J].公路工程,2018,43(5):152-156.
[6]朱伯芳.大体积混凝土温度应力与温度控制[M].北京:中国电力出版社,1999.
[7]朱伯芳,蔡建波.混凝土坝水管冷却效果的有限元分析[J].水利学报,1985,(4):27-36.
[8]朱岳明,徐之青,等.混凝土水管冷却温度场的计算方法[J].长江科学院院报,2003,20(2):19-21.
[9]王解军,梁锦锋,王明明.连续刚构桥承台施工中的温度分析[J].中南公路工程,2005,30(4):86-90.
[10]牛建丰.高墩大跨桥梁大体积混凝土水化热分析研究[D].重庆:重庆大学,2013.
[11]大体积混凝土施工规范(GB 50496-2009)[S].北京:中国计划出版社,2009.