冬期施工钻孔灌注桩混凝土温度测试研究

On Drill-affused Stake Concrete Temperature Testing in Winter

新建哈大铁路客运专线TJ-3标段中最长的伊通河特大桥工程位于东北高寒、高纬度地区,沿线冬季气候寒冷,施工周期与工期要求的矛盾十分突出,因此必须制定相应的冬期施工措施,延长施工周期。针对在冬期进行桩基施工的情况,在采取冬期施工质量保证措施的条件下,测试了桩基混凝土入孔温度以及浇注前、浇注过程中和浇注后桩身混凝土温度随时间的发展特性;测试混凝土在不同养护环境不同龄期的强度值及其强度增长特性;通过在土体中不同深度埋设温度传感器测试桩基混凝土浇注后所处的外界土壤环境温度状态,并根据混凝土成熟度理论近似估算桩身混凝土实际的强度发展情况。测试结果表明,在满足规范规定的混凝土入模温度的情况下,桩基混凝土的施工质量满足铁路规范规定的要求。

Harbin—Dalian Passenger Dedicated Line is one of the high speed railway lines constructed in China.It features great investment,advanced technology,high speed（350 km/h）and long life-span（100 years）.The longest Yi Tong River Bridge is constructed by the CCCC Third Harbor Engineering Company Ltd.This engineering is challenged by very cold weather,high latitude and pressing construction time limit,thus,the construction period had to be prolonged into winter construction step.This paper describes the condition of stake concrete construction by testing the temperature,the concrete intension in different environments and durations,the soil temperature in various depths with temperature sensor as well,and calculates the concrete intension with mature theories.The testing results indicate that the construction quality of stake concrete can fulfill railway criterion in condition that the concrete temperature must meet the criterion demands.