Jacking Bases 0 Reviews Sacrificial jacking bases are simply cast into the initial concrete collar before shaft jacking commences. Jacking tops are then bolted to the bases. This removes the need for casting pockets and HT bars used with some other systems. SUBMIT ENQUIRY Submit SEE MORE Shaft Jacking Features Sizes Reviews (0) No need for casting pockets and HT bars To Suit 600mm/1m tops Add New CommentReply CommentNameEmailComments HtmlPreview b i u quote Notify me when new comments are added Enter the code shown above in the box below Save Comment