大型斜轴泵站流道结构商品混凝土温控防裂方法研究  

Research on Temperature Control and Crack Prevention Methods of Commercial Concrete in the Flow Channel Structure of Large-scale Oblique Pumping Station

作　　者：何勇[1] 周益安 别亚静 强晟[2] 

机构地区：[1]杭州市南排工程建设管理处,浙江杭州310019 [2]河海大学水利水电工程学院,江苏南京210098

出　　处：《浙江水利科技》2016年第4期61-67,共7页Zhejiang Hydrotechnics

基　　金：浙江省水利厅科技项目(RC1131)

摘　　要：因为大型斜轴泵流道结构的约束和受力比较复杂,商品混凝土入仓温度不可控等因素,施工期易开裂。采用三维非稳定温度场、应力场的有限元计算方法,对不同季节浇筑的斜轴泵流道结构进行仿真计算。根据温度场和应力场的计算结果,提出了不同季节不同浇筑块的温控防裂措施。结果表明,表面保温与通水冷却相结合是提高结构抗裂性能的有效措施。另外,研究了不同表面保湿措施对干缩应力的影响,结果显示,喷雾洒水养护优于密封养护,可显著降低混凝土早龄期的表面应力,降低表面开裂的概率。Because of the complex restraint and force of large- scale inclined shaft pump flow channel structure,uncontrollable placing temperature of commodity concrete,and other factors,it is prone to crack in construction period.Simulation calculation was carried out on the inclined- axis pumps channel structures poured in different seasons by using finite- element computing method of three- dimensional unstable temperature field and stress field.According to the calculation result of temperature field and stress field,the temperature control and crack prevention measures were proposed for different placement blocks poured in different seasons.The result showed that the combination of surface insulation and water cooling is an effective measure to improve the anti- cracking ability of structures.In addition,this paper studied the impact of different surface moisture measures to shrinkage stress.The result indicated that spray sprinkler maintenance is better than seal conservation,as it can decrease the early- age surface stress of concrete remarkably,and lower the surface cracking rate.

关 键 词：有限元 湿度 温控防裂 商品混凝土 流道 斜轴泵站 

分 类 号：TV431[水利工程—水工结构工程]