Profile melting-drill process and device
AssigneeTechnologie Transfer Est.
InventorWerner Foppe
Life of this patent
Estimating the term…
Abstract
Only a gap defining the outer profile of the tunnel or borehole is melted down in a peripheral heat drilling process for tunnels, deep-well and exploration boreholes. The drill core, surrounded by the generated gap, initially remains and is then extracted at intervals via a tube. It is expedient for the drill core to be sheared off and extracted continuously after it has passed a cooling zone. The height of the drill core, which first remains in the borehole, is determined such that the molten rock can be pressed into the drill core, whereby the necessary pressure for this pressing in is maintained essentially constant, independently of the depth of the borehole concerned.
Claims28
A melting-drill process for tunnel drillings, deep-drillings, and exploratory drillings comprising
- detaching a drill core from its rock formation mass under cracking and ripping caused by thermal stresses;
- melting only a profile of a borehole to be drilled;
- pressing the resulting melt substantially into the drill core;
- subsequently solidifying the drill core by cooling;
- shearing off of the drill core;
- and
- removing the drill core in sections, whereby a pressure decrease is achieved in drillings and wherein said pressure decrease allows a limiting of the required melt pressure in the drilled hole.
A melting-drill process for tunnel drillings, deep-drillings, and exploratory drillings to drill depths where the overburden pressure in the sidewall rock exceeds the technically controllable melt pressures such that the melt can no longer be pressed into the sidewall rock, or for shaft and tunnel drillings which run in a vertical direction, where oversized diameters do not allow a removal displacement of the total drill core melt due to energy and process-technical reasons, comprising
- melting only an outer circular profile of the borehole to be drilled
- pressing the resulting melt primarily into the drill core, which has been detached from its rock mass and is therefore cracked and ripped by thermostress,
- subsequently solidifying the drill core by cooling, and
- shearing off and removing the drill core in sections, whereby a pressure decrease is achieved in shaft drillings and deep-drillings, where said pressure decrease allows a limiting of the required melt pressure.
A device for executing a melting-drill process for tunnel drillings, deep-drillings, and exploratory drillings, wherein the device comprises
- a hollow-cylindrical pressure pipe strand;
- a hollow-cylindrical pressure drill head for melt drilling attached to the hollow-cylindrical pressure pipe strand;
- wherein a space in the center of the pressure drill head and of the pressure pipe strand is left empty in direction of drilling;
- a fuel line for liquid oxygen;
- a fuel line for liquid hydrogen;
- nozzles disposed on a periphery of the pressure drill head and connected to the fuel line for liquid oxygen and to the fuel line for liquid hydrogen.
A device for executing a melting-drill process for tunnel drillings, deep-drillings, and exploratory drillings, wherein the device comprises
- a hollow-cylindrical pressure drill head for melt drilling and a hollow-cylindrical pressure pipe strand, wherein a space in the center of the pressure drill head and of the pressure pipe strand is left empty in direction of drilling;
- several heat sources distributed over the circumference of the hollow-cylindrical pressure drill head, where said heat sources generate a melt heat, wherein the hollow-cylindrical pressure drill head is upwardly tapered at its inner side and opens into a tubular cooling zone, wherein a cooling agent can flow through a wall of the cooling zone;
- a steel pipe of a slightly larger inner diameter than the cooling zone following the cooling zone of the hollow-cylindrical pressure drill head;
- wherein the steel pipe forms a support pipe over the height of a remaining drill core column;
- wherein the pressure pipe strand is comprised of two steel pipes, disposed concentrically with respect to each other, wherein the two steel pipes are each assembled by at least two shells, and
- wherein lines for a supply of fuel gas and cooling agent are guided in an intermediate space between the two steel pipes;
- a drill-core hoisting device suspended in the interior of the pressure pipe strand, wherein the drill-core hoisting device is formed as a bell which can be clapped over the remaining drill core, and wherein the drill-core hoisting device includes means for a clamping and shearing off of the drill core.
Dependencies are inferred from the claim text.