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某综合楼工程,建筑面积5320m~2,下部两层为混凝土框架结构,上部为四层砖混结构,钢筋混凝土挖孔灌注桩基础,底部两层框架混凝土强度等级为C30,设计要求柱节点处强度等级同下层柱。1 事故概况本工程于1996年11月25日开工,1997年7月12日该工程形象进度为三层结顶,四层砌体已完成三分之一,在拆除第二层框架混凝土模板时,发现大量质量问题,露筋、蜂窝、孔洞比较多,部分柱头甚至出现超过截面尺寸2/3的严重缺陷,情
A comprehensive building project with a building area of 5320m 2, the lower two floors are concrete frame structures, the upper is a four-story brick-concrete structure, the foundation of reinforced concrete bored and cast-in-place bored piles, the bottom two-story frame concrete strength grade C30, Intensity level with the lower column. 1 Accident Overview The project was started on November 25, 1996, July 12, 1997 the progress of the project image three-tier structure, four-story masonry has completed one-third of the time in the removal of the second floor of the concrete formwork template , Found a large number of quality problems, tendons, honeycombs, more holes, some stigma even appeared more than 2/3 of the serious cross-section size defects, love