钻孔灌注桩灌注水下混凝土时，易发生拔导管时拔漏（拔出混凝土外）事故。这种灌注事故一旦发生，又没有及时补救的办法时，就得废弃，不但经济上损失很大，而且影响施工进度和工程质量。插入式导管头能够解决这一矛盾，将导管重新插入混凝土内，然后继续灌注混凝土。没有任何 When pouring underwater cast-in-place concrete piles into underwater concrete, it is easy to accidentally pull out (outside of the concrete) when pulling the catheter. Once this kind of infusion accident occurs, and there is no timely remedy, it must be abandoned. Not only does it have a large economic loss, it also affects the construction schedule and the quality of the project. A plug-in catheter head can solve this problem by reinserting the catheter into the concrete and continuing to infuse the concrete. not any