Abstract: The present disclosure relates to a gyro-based surveying tool for surveying of holes oriented in a basically vertical direction in areas with no line-of-sight connection to the sky. The gyro-based surveying tool comprises a surveying head and an analysing unit. The surveying head comprises a plurality of MicroElectroMechanical-systems-inertial-measurement-unit arrangements, MEMS-IMU arrangements. Each of the MEMS-IMU arrangements is arranged to transmit information relating to their measurement results to the analysing unit. The analysing unit is arranged to receive and analyse said transmitted information relating to the measurement results from the plurality of MEMS-IMU arrangements so as to calculate a combined measurement result. The surveying tool further comprises means for calculating an attitude and/or position of said surveying head based on said combined measurement result. The present disclosure also relates to a surveying method, a computer program for surveying, and a computer program product.

Abstract: The present invention relates to a method for optimising energy usage at a drilling arrangement. The method includes the step of determining an acceleration of a drilling head in the drilling arrangement. The method further includes determining a parameter related to the energy usage at the drilling arrangement based on the determined acceleration. The method even further includes optimising the energy usage based on the determined parameter. The present invention also relates to a system for optimising energy usage at a drilling arrangement, to a computer program, and to a computer program product.

Abstract: The present invention relates to a method for optimising energy usage at a drilling arrangement. The method includes the step of determining an acceleration of a drilling head in the drilling arrangement. The method further includes determining a parameter related to the energy usage at the drilling arrangement based on the determined acceleration. The method even further includes optimising the energy usage based on the determined parameter. The present invention also relates to a system for optimising energy usage at a drilling arrangement, to a computer program, and to a computer program product.

Abstract: An arrangement at a drill includes a drill bit intended to be inserted at its neck into a chuck in a down-the-hole drill, a control means for guiding the drill and a lining pipe, a coupling arrangement in the form of a bayonet coupling or similar with which the drill can be coupled to the control means in a manner that allows them to be separated and that in its freed condition allows the drill, together with the down-the-hole drill, to be withdrawn through the lining pipe, a flushing passage for the supply of flushing agent in front of the drill and an evacuation passage for the removal of drilling cuttings together the flushing agent. It also includes a casing shoe that can be applied at the forward end of the lining pipe and a contact surface arranged at a stationary part of the down-the-hole drill.

Abstract: An arrangement for the angular setting of a drill string includes a first tubular member, a second tubular member, a plurality of control and actuator devices that can be shortened and lengthened in a longitudinal direction through the influence of a driving device, and remote controllers by which the control and actuator devices can be set selectively and independently of each other in a radially extended or radially withdrawn condition.

Abstract: The present disclosure relates to a gyro-based surveying tool for surveying of holes oriented in a basically vertical direction in areas with no line-of-sight connection to the sky. The gyro-based surveying tool comprises a surveying head and an analysing unit. The surveying head comprises a plurality of MicroElectroMechanical-systems-inertial-measurement-unit arrangements, MEMS-IMU arrangements. Each of the MEMS-IMU arrangements is arranged to transmit information relating to their measurement results to the analysing unit. The analysing unit is arranged to receive and analyse said transmitted information relating to the measurement results from the plurality of MEMS-IMU arrangements so as to calculate a combined measurement result. The surveying tool further comprises means for calculating an attitude and/or position of said surveying head based on said combined measurement result. The present disclosure also relates to a surveying method, a computer program for surveying, and a computer program product.

Abstract: The invention concerns a method to establish communication between the inner cavity of a drill string and the surrounding material down in a drill hole (60) during the use of a down-the-hole drill unit with a drill string (10), a down-the-hole hammer drill (1), and a source of pressurized medium (11) that delivers a medium under pressure to the down-the-hole hammer drill.

Abstract: An arrangement for the angular setting of a drill string includes a first tubular member, a second tubular member, a plurality of control and actuator devices that can be shortened and lengthened in a longitudinal direction through the influence of a driving device, and remote controllers by which the control and actuator devices can be set selectively and independently of each other in a radially extended or radially withdrawn condition.

Abstract: An arrangement at a drill includes a drill bit intended to be inserted at its neck into a chuck in a down-the-hole drill, a control means for guiding the drill and a lining pipe, a coupling arrangement in the form of a bayonet coupling or similar with which the drill can be coupled to the control means in a manner that allows them to be separated and that in its freed condition allows the drill, together with the down-the-hole drill, to be withdrawn through the lining pipe, a flushing passage for the supply of flushing agent in front of the drill and an evacuation passage for the removal of drilling cuttings together the flushing agent. It also includes a casing shoe that can be applied at the forward end of the lining pipe and a contact surface arranged at a stationary part of the down-the-hole drill.

Abstract: The invention concerns a drill bit, intended to be used with a down-the-hole drill and comprising a drill head (2) with a front surface provided with drill pins (3) and a shaft (4), whereby the shaft is narrower than the drill head and intended to be inserted in a manner that allows axial sliding into the end of a drill chuck that is a component of a down-the-hole drill and which shaft has a rear end part (6) that is somewhat thickened with a plane striking surface (7) against which a hammer piston (8) that is a component of the down-the-hole hammer drill is arranged to impact, that the drill head when viewed along its axial direction has a cylinder-shaped forward part (20) provided with cuttings channels (22), a rear cylinder-shaped part (21) that is located for the reception of drill cuttings at the same level or somewhat below the bottom (25) of the cuttings channels, whereby the diameter (D1) of the forward part is greater than the diameter (D2) of the rear part.

Abstract: An arrangement for a down-the-hole hammer drill, for use in soil consolidation by jet grouting, and comprising a cylindrical machine housing, an impact mechanism driven by pressurised fluid that impacts onto a drill bit mounted in a chuck in the machine housing that allows reciprocating motion, whereby the machine housing has a central supply line for the driving fluid to the impact mechanism in which channels in the drill bit constitute outlets for used driving fluid. The machine housing is provided with a grouting nozzle for jet grouting, that the grouting nozzle is directed in a sideways direction and arranged at the periphery of the wall of the machine housing, that a rinsing channel for conducting a grouting mixture through the machine housing to the said grouting nozzle is arranged whereby the rinsing channel for the grouting mixture is separate from the supply line for the driving fluid of the impact mechanism.