Boer

Drill - A tool for making holes in the ground and in different rocks. The form B. is various; main types: steel chisel with a pyramidal point, cutter or scoop in the form of a hollow cylinder with a pointed end. tubular B. with nadstavnymi parts (rods) and a steel or diamond crown and others. Drilling is performed in the vertical and horizontal direction when conducting tunnels, device artesian wells, mines, mines and so on. All drilling systems are reduced to two groups - rotary and percussion. -1) Rotary drilling is done manually and by machine, the latter being used at great depths; as the drilling tools deepen, new rods (poles) are screwed to their rods until the desired depth is reached. The Fowelle system (Fauvelle) consists in using hollow rods into which water is pumped: due to pressure, it forcefully escapes from the end at the bottom of the well, rises between its walls and rods to the top and carries away the rock destroyed by drilling, thereby eliminating clogged wells; before that, it was required to raise the entire system every minute and clean the drill and the well. The tool used in the Fowel method is a tubular drill with a steel or diamond crown (for hard rocks), rotated by means of mechanical means. engine; at the same time, the drill cuts out a ring-shaped hole, and the remaining core can be removed in the form of long cylinders, giving a clear understanding of the layers of the rocks covered and even their inclination. Rotate Drilling is used for both vertical and horizontal directions. -2) Impact drilling is performed with chisels, manual. or machine. way; the bit is strengthened: 1) on the whole. metal. rods, 2) for hollow pieces. with washing with water, 3) on a wire. rope, 4) freely falls from a known height and crushes the rock with its weight.