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1 成孔质量的控制1.1 采取隔孔施工程序钻孔混凝土灌注桩和打入桩不同,打入桩是将周围土体挤开,桩身具有很高的强度,土体对桩产生被动土压力。钻孔混凝土灌注桩则是先成孔,然后在孔内成桩,周围土体对桩产生动压力。尤其是在成桩初始,桩身混凝土的强度很低,且混凝土灌注板的成孔是依靠泥浆来平衡的,故采取较适应的桩距对防止坍孔和缩径是一项稳妥的技术措施。
1 into the hole quality control 1.1 to take the hole construction procedure bored concrete bored pile and driving pile is different, driving into the pile is to squeeze the surrounding soil, pile body has a high strength, soil to the pile passive earth pressure . Drilled concrete piles are the first hole, and then into the pile hole, the soil around the pile dynamic pressure. Especially at the initial stage of pile formation, the strength of the concrete in the pile body is very low and the formation of the concrete perfusion plate is balanced by the mud. Therefore, it is a safe technical measure to prevent collapse and shrinkage of the hole by adopting a more suitable pile spacing. .