2015年1月下
第44卷
第2期
DOI;10. 7672/sgjs2015020015
施工技
术
CONSTRUCTION TECHNOLOGY
天津高银117大厦C50P8超大体积板缩尺模型
混凝土浇筑试验研究
陈保勋".2，周鹏华3
（1.武汉大学土木建筑工程学院，湖北武汉430072；2.中建三局集团有限公司，湖北式汉
430064
3.中建三局集团有限公司工程总承包公司，潮北武汉430064）
【摘要】随着超高层建筑高度和体量的不断增大，基础筏板量现大体积、高强度、大厚度的发展趋势，由此带来的大体积混凝土温度与裂缝控制问题愈发突出。依托天津高银117大厦C50P8超大体积筏板混凝土工程实际，首次在国内外大体积板施工领域，采用尺寸为6.5m×6.5m×6.5m(275m"）的筏板缩尺模型进行模摄试验，对混凝土的内部温度及应力情况进行监测分析。研究表明：混凝土中心部位和外部的温差在混凝土升温阶段保持相对较低的水平，在混凝土降温阶段，尤其是去掉覆盖以后，内外温差较大；实际施工中应时刻关注降温时混凝土的内外温差，调整保温层的厚度和移除保温层的时间；混凝土表层的应力应变较混凝土中心部位更大；混凝土在7d和14d时的开裂风险较高，在28d时开裂风险相对较低。
【关键调】高层建筑：混凝土；板；缩尺模型；数值模报；试验
【中图分类号】TU753;TU375
【文献标识码］A
[文章编号］1002-8498(2015)02-0015-07
ExperimentResearchonConcretePouringofScaleModelof C50PUltra-massRaftinTianjinGaoyin117Building
Chen Baoxun'.,Zhou Penghua"
(1. School of Cisil and Architectural Engineering,Wuhan Unitersity, Wuhan, Hubei 430072, China; 2. Ching Construction Third Engineering Bureau Group Co. , Lad. , Wuhan, Hubei 430064, China; 3. General Construction Company of CCTEB Group Co., Lid.,Wuhan, Hubei 430064, China)
Abstract: With the increasing of the height and scale of super high-rise building, raft foundation characteristics of ultra-mass, high strength, large thickness are more obvious. As a result, the problem of temperature and crack control of high-grade ultra-mass concrete becomes more and more serious. Based on the pouring construction of C50P8 uitra-mass raft concrete of Tianjin Gaoyin 117 Building, simulation experiment useing scale model of ultra-mass raft is first done in the field of ultra-mass concrete construction at home and abroad. The model is 6.5m long, 6. 5m wide and 6. 5m high, and its volume is 275m'. Temperature and stress inside the concrete are monitored and analyzed. Research shows that temperature difference between center and external of concrete is small in the temperature-rise period; the difference is big in the temperature-fall period, particularly after removing the cover. Temperature difference between center and external of concrete should be kept focused on in actual construction in the stage of temperature increasing, adjusting the thickness and removal time of insulating layer; concrete stress and strain of concrete surface is bigger than that of concrete center; cracking risk of concrete after 7 days is higher than that after 14 days, and it is low after 28 days.
Key words:tall buildings; concrete; raft; scale model; simulation; testing
0
引言
现有超高层建筑基础多为桩-筱板基础，如上海
。中建三局研发课题项目（CSCEC3B-2012-14）
【作者简介】陈保期，中建三局集团有限公司到总经理，高级工程师，
E-mail;309107981@ qq. com【收稿日期】2014-11-10
万方数据
15
中心、台北101大厦、上海环球金融中心等。为了满足超高层建筑基础结构受力要求，基础筱板大体积、高强度、大厚度的发展趋势日益凸显，由此带来的高强度等级大体积混凝土的温度与裂缝控制问题愈发突出。