| 336 | 40 | 48 |
| 下载次数 | 被引频次 | 阅读次数 |
以某特大桥为工程背景,结合大体积混凝土施工特点对温控方案及相关技术措施进行了详细阐述,并通过现场监测数据得到了相关的分析结果。通过筛选性能优良的原材料,利用粉煤灰的自身优势优化混凝土配合比,实行分层浇筑混凝土,布设循环水冷却管,进行保温保湿养护,结合现场实际情况对养护时间合理延长等,并实行承台施工前、中、后期的全过程温度监测,经温度对比分析后给出温控调整方案,实行信息化施工,为温度调控提供数据依据。实践证明,实施温度监测并采取合理的温控关键技术措施,能够科学地指导施工,各项温控指标均达标,有效地预防了结构表面温度裂缝,确保了结构的施工质量,为后期工作提供了保障,对同类施工项目提供了参考。
Abstract：Based on the engineering background of a super-large bridge and the construction characteristics of mass concrete, the temperature control scheme and related technical measures are elaborated in detail, and the relevant analysis results are obtained through field monitoring data. Through screening raw materials with excellent performance, optimizing concrete mix proportion by using fly ash's own advantages, layering concrete, laying circulating water cooling pipes, carrying out heat preservation and moisturizing maintenance, reasonably prolonging maintenance time in combination with the actual situation on site, and carrying out temperature monitoring in the whole process before, during and after the construction of the cap, the temperature control adjusting Party is given after the comparative analysis of temperature. Information construction is carried out to provide data basis for temperature control. Practice has proved that the implementation of temperature monitoring and the adoption of reasonable key technology measures of temperature control can guide construction scientifically, all temperature control indicators meet the standards, effectively prevent the surface temperature cracks of the structure, ensure the construction quality of the structure, provide guarantee for later work, and have a reference value for similar construction projects.
[1] GB 50496-2018,大体积混凝土施工规范[S].
[2] 贺茂生,任回兴,聂青龙,等.苏通大桥南塔墩承台超大体积混凝土施工温控关键技术[J].公路,2006(05):90-95.
[3] 刘鹏.大体积混凝土养护及温控施工方案研究[J].公路,2017,62(06):150-153.
[4] 余倩,唐建伟,胡计兰,等.循环水冷却系统用于大体积混凝土裂缝控制应用研究[J].混凝土,2015(01):158-160.
[5] 魏胜新,王强.超大体积承台混凝土性能研究与温控技术[J].混凝土,2014(01):127-131.
[6] JTG/T F50-2011,公路桥涵施工技术规范[S].
[7] 司选舟,殷旭东.特大承台大体积混凝土水化热分析及温控设计[J].公路交通科技(应用技术版),2018,14(11):235-236,276.
[8] 秦宇,张秋信,余毅.平塘特大桥中塔承台大体积混凝土温控技术[J].世界桥梁,2018,46(02):30-34.
[9] 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.
[10] JK Yang,Y Lee,JK Kim.Heat Transfer Coefficient in Flow Convection of Pipe-Cooling System in Massive Concrete[J].Journal of Advanced Concrete Technology,2011,9(1):103-114.
[11] Mamdouh M.Elbadry,Amin Ghali.Temperature Variations in Concrete Bridges[J].Journal of Structural Engineering,Oct 1983,109(10):2355-2374.
[12] Donald M.Smith,Michael I.Hammons,Creep of Mass Concrete at Ages[J].Journal of Materials in Civil Engineering.August 1993,5(3):411-417.
[13] 刘冠国,马爱斌,秦鸿根,等.崇启大桥C35承台混凝土配合比设计与优化[J].混凝土,2015(01):151-154.
[14] 罗超云,李志生,周立.嘉绍大桥承台超大体积混凝土无冷却水管温控技术研究[J].公路,2012,(7):101-106.
[15] M.Sule,K.Van Breugel.The Effect of Reinforcement on Early-Age Cracking Due to Autogenous Shrinkage and Thermal Effects[J].Cement Concrete Composites.2004,26(3):581-587.
[16] Santrojian O.,Kolarow L.A spatial fem model of thermal stress state of concrete blocks with creep consideration[J].Computers & Structures,1996 58 (3):563-574.
[17] 万惠文,谢春磊,徐文冰,等.大体积高强混凝土承台的温度控制与监测分析[J].混凝土,2010(09):104-107.
[18] 俞露,王磊,朱为玄.虎跳河特大桥承台大体积混凝土温差测控研究[J].山西建筑,2006,32(24):121-122.\
基本信息:
DOI：10.19782/j.cnki.1674-0610.2019.05.027
中图分类号:U445.57
引用信息:
[1]乔明.某特大桥承台大体积混凝土施工温控关键技术研究及应用[J].公路工程,2019,44(05):135-141.DOI:10.19782/j.cnki.1674-0610.2019.05.027.
基金信息:
中铁十二局集团有限公司科技研究开发计划项目(公司技[2015]19号-36)
2019-10-20
2019-10-20