埋设铝塑管的大体积混凝土裂缝控制机理与力学性能研究  

Crack control mechanism and mechanical properties of mass concrete with buried aluminum plastic pipes

作　　者：江昔平[1,2] 刘洋[1] 刘阳[1] 王玲娟[1] 

机构地区：[1]安徽理工大学土木建筑学院,淮南232001 [2]西安建筑科技大学土木学院,西安710055

出　　处：《建筑结构》2013年第13期67-70,94,共5页Building Structure

基　　金：住房和城乡建设部科研项目(2011-K4-28);安徽省建设行业科研项目(2011-YF-38);安徽省教育厅科研项目(KJ2011Z110);淮南市科技局科研项目(2011A07907)

摘　　要：针对大体积混凝土温度裂缝控制中使用传统冷凝管存在的一些问题,结合铝塑管自身的优良特性,分析了铝塑管控制大体积混凝土温度裂缝的机理。对铝塑管作为冷凝管时,管径选择、通水要求、管路布置、设计要求等关键技术问题进行了深入探讨。对埋设铝塑管的大体积混凝土力学性能进行系统研究,主要包括:在温度应力作用下,大体积混凝土中铝塑管应力、应变问题;大体积混凝土结构等效惯性矩、等效宽度的计算问题;施工中铝塑管抗浮问题。研究结果表明:充分利用铝塑管导热系数小、柔性变形的特点,一方面控制了大体积混凝土内部水化热,另一方面通过铝塑管的变形,使大体积混凝土所产生的约束应力得到足够的释放,很好地解决了大体积混凝土温度裂缝问题。Based on existed problems in using traditional condenser pipes to control temperature cracks of mass concrete and excellent properties of aluminum plastic pipes,the mechanism of using aluminum plastic pipe to control mass concrete temperature cracks was analyzed.The key technologies of diameter selection,requirements of cooling water,pipeline layouts and design requirements of aluminum plastic pipes were further discussed when used as condenser pipes.Mechanical properties of mass concrete with buried aluminum plastic pipes were systematically designed.These properties are mainly focus on the following aspects： the strain and stress of aluminum plastic pipes in mass concrete under temperature stress impact;equivalent inertia moment and equivalent width calculation problems of mass concrete structure;anti-floating design of aluminum plastic pipes in construction.Results show that making full use of the characteristics of low thermal conductivity and flexible deformation of aluminum plastic pipes can control internal hydration heat in mass concrete;on the other hand,constraint stress generated by mass concrete is sufficiently released through deformation of aluminum plastic pipes.This method solves temperature cracks problem of mass concrete well.

关 键 词：铝塑管 大体积混凝土 柔性变形 力学性能 控制机理 

分 类 号：TU47[建筑科学—结构工程]