Core drilling methods and devices
AssigneeMauerspecht GmbH
InventorVolker Galinsky
Life of this patent
Estimating the term…
Abstract
Methods and devices for the execution of core drillings in a material by a drilling unit, which makes use of a drill bit, and such drill bits that are made up of a hollow cylindrical core barrel, which has an end plate at its rear end and abrasion elements, which serve the abrasion of material, at the front end as well as at least two high-pressure jet nozzles, which can be connected with a high-pressure source of a blasting medium. The high-pressure jet nozzles are arranged on the inner surface of the core barrel and/or its end plate and are oriented into the inside of the core barrel. As a result of a combined forward motion and rotation of the drill bit, a drilling core is formed from which an abrasion takes place by means of the blasting medium, whereby overburden is removed from the drill bit.
Claims20
A method for the execution of core drillings into a material by way of drilling units which use a drill bit, which has a core barrel, which has an end plate arranged at a rear end of the core barrel, and which has abrasion elements distributed across a surface of the core barrel in a circular manner at a front end of the core barrel serving the abrasion of material, the method comprising:
- executing a forward motion of the drill bit combined with a rotation of the drill bit about a central axis of the drill bit via a drive unit for annular abrasion at the material and formation of a drilling core of the material in the core barrel;
- providing a blasting medium under high pressure to the drill bit;
- generating at least two high pressure jets of the blasting medium directed into an inside of the drill bit via high-pressure jet nozzles arranged on a surface of the end plate facing the front end and directed to an inside of the core barrel;
- and
- abrading the material at a free end of the drilling core by the blasting medium.
A drill bit comprising:
- a core barrel, with a central axis and a front end and a rear end, which is opposite to the front end;
- whereby the core barrel has abrasion elements, which are fixed at the front end on the surface of the core barrel and distributed in a circular manner, and whereby, at the rear end of the core barrel, an end plate is arranged;
- a connector for the formation of a mechanical connection between the drill bit and an external supply unit of a drilling unit in such a way that the drill bit can be rotated;
- at least two high-pressure jet nozzles, which can be connected with an external high-pressure source of a blasting medium, whereby the high-pressure jet nozzles are arranged on an inner surface of the core barrel and/or on a surface of the end plate facing the front end, and are directed to an inside of the core barrel;
- and
- wherein the drill bit has at least one outflow for discharging excavated matter from the inside of the core barrel, and the at least one outflow is an opening formed in the end plate.
Dependencies are inferred from the claim text.