Modification of a Post-Grouting Pipeline and Its Application in the Borehole Cleaning of Compresol Piles

A new borehole cleaning method used along with the normal circulation borehole cleaning is presented. The post-grouting pipeline is developed through optimizing design and modification. The added instruments - T-joint, check valve, and annular borehole clearing device - are summarized. The post-grouting pipeline is not only used for post-grouting, but also for borehole cleaning. Compared with the traditional normal circulation borehole cleaning method, this method can obviously improve the efficiency of the borehole cleaning. It can make up for the limitations of the normal circulation borehole cleaning, which is usable only for common small-medium piles. Compared with the air-lift reverse circulation borehole cleaning, it can be noted that the new method is much easier to construct and requires fewer workers. Besides that, the annular borehole clearing device continues to spray compressed air and cleans up the bottom sediment. Its goal is to further cement the effects of borehole cleaning. Therefore, the new borehole cleaning method has obvious advantages in every respect, and it is worth generalizing and applying in the field of pile foundation engineering.