二、各工艺特点及适用范围
1、旋挖成孔施工工艺特点及适用范围
2、正循环回转钻孔工艺特点及适用范围
3、反循环回转钻孔工艺特点及适用范围
4、冲击钻成孔工艺特点及适用范围
5、长螺旋钻孔压灌混凝土后插钢筋笼施工工艺特点及适用范围
三.基础桩施工常见问题及处理办法
1成孔过程中出现的问题
(1)塌孔、漏浆、流砂
(2)钻孔偏移倾斜
(3)缩颈
2钢筋笼安装过程中的问题
(1)钢筋笼偏位、变形、上浮
(2)吊脚桩
3浇筑成桩过程中发生的问题
(1)断桩

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