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【简答题】
某市一制品厂新建56 000 m2钢结构厂房,其中A至B轴为额外2层框架结构的办公楼,基础为桩基础,1层地面为C20厚150 mm混凝土。2007年开工,2008年竣工。施工图中设计有15处预应力混凝土管桩(打压)基础,在施工后,现场检查发现如下事件。 事件一:有5根桩深度不够。 事件二:有3根桩桩身断裂。 另施工图B处还设计有桩基础,放线人员由于看图不细,基础超挖0.5m;由于基坑和地面回填土不密实,致使地面沉降开裂严重。 问题 1.简述事件一质量问题发生的原因及防治措施。 2.简述事件二质量问题发生的原因及防治措施。 3.超挖部分是否需要处理?如何处理? 4.回填土不密实的原因及防治方法是什么?
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