超长大体积混凝土结构地下室抗裂防渗工法.zip

QDCG-GF12001超长大体积混凝土结构地下室抗裂防渗工法TechniqueprocessofResistingCrackandPreventingInfiltrationofReinforced-ConcreteStructureBasement2004-12-30发布2005-3-1实施青岛**··················································································································································································································································································································································································································································································································································································································································································································································································································································,和总结集团公司大型地下室工程实践,并吸收国内外超长大体积混凝土结构工程先进技术的基础上,编制形成的。其中所涉及的大型工程有:中级法院综合审判楼,会展中心,**大厦等工程。、材料、施工工艺三方面,提出了防止混凝土结构地下室开裂及渗漏的综合技术措施,可以有效地解决地下室结构开裂及渗漏的问题,具有明显的技术经济效果。本工法既有充分的理论依据,又有很强的可操作性。对地下室工程的设计和施工均具有指导意义。,也可用于指导一般的混凝土结构地下室工程的施工。、加强带、间歇式加强带的原理减小超长混凝土结构的收缩应力,控制其裂缝;通过掺加粉煤灰、聚丙烯纤维、外加剂等措施,优化混凝土配合比,降低大体积混凝土的水化热,增强混凝土的抗裂性能,及混凝土的密实性和可操作性。本工法依据国家现行混凝土结构设计、施工质量验收等技术规范,混凝土结构及材料理论,集团公司的最新试验研究和理论分析成果。、:用于解决高层主体与低层裙房的差异沉降者,称为后浇沉降带;用于解决钢筋混凝土收缩变形者,称为后浇收缩带;用于解决混凝土温度应力者,称为后浇温度带。(1)后浇带应设在受力和变形较小的部位,宽度宜为700~1000mm。后浇带的间距应根据结构级结构约束条件确定,宜为30~60m。后浇带的设置还应与施工段的划分相结合;在间距允许的情况下,应避免在主楼设置后浇带,以利于各工序的穿插和工程进展。(2)后浇带可做成平缝和企口缝,;后浇收缩带结构主筋可不断开,如必须断开时,主筋应采用焊接连接;沉降式后浇带结构主筋应断开,主筋应采用搭接,搭接长度不小于45d。后浇带部位钢筋应严格按照设计要求加设附加钢筋。(3)底板后浇带可设计为下凹式,以减少清理后浇带的难度,避免该部位的渗漏,。(4)后浇带应采用补偿收缩式混凝土,其强度等级应比两侧混凝土强度提高一个等级。