2、表面不平、标高不准、尺寸增大：由于水平标志的线或木橛不准，操作时未认真找平，或模板支撑不牢等原因造成。
3、缝隙夹渣：施工缝处混凝土结合不好，有杂物。主要是未认真清理而造成。
4、不规则裂缝：基础过长而收缩，上下层混凝土结合不好，养护不够，或拆模过早而造成。
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