⑴ 下钻:
①采用正向非同步技术挤压土体形成圆柱状至直杆段设计标高;
②随后钻杆采用正向同步技术下钻,使土体形成螺纹状直至设计深度。
⑵提钻:
①顺着已形成的土体螺纹轨迹钻杆反向同步技术提升至螺纹段顶标高;
②在直杆段土体内采用直提钻杆或正向非同步技术提钻;
③提钻阶段中,在提钻同时泵机利用钻杆作为通道,保持额定泵压和泵速在高压状态下使混凝土形成螺纹状桩体或圆柱状桩体。
另外,根据工作的需求,只需要在提钻时采用非同步技术或正向旋转提钻,就可以扫去下钻时形成的螺纹形孔,从而形成直线型或带扩大头的直线型桩。
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