BORING FIXATION ELEMENT OF CONSTRUCTIONS

摘要

This boring element is similarly known as fixation elements formed by boring tube at the lower end of which there is conus fastened by finished apex. Substance of technical solution results in that two blades at least are fixed to conus whose areas at conus towards from top up are gradualy expanding and further boring tube has at its upper end kept two connecting elements at least. The blades can be two ones with the advantage that they are placed at conus against to each other under angles 15 to 75°. As for the form of blades it is advantageous if they have the form o f round curve whereas round parts of blades are oriented towards from axis of conus.