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OwnerGustaf Hakan Oscar Wibominventor
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In a method of making holes of selective external configuration in a rock or earth formation, two or more rotatable drills provided with drill crowns are driven into the ground. The drill crowns are so arranged that they will touch each other or are radially spaced a small distance from each other and are substantially on the same level. The drill crowns are simultaneously axially displaced while they are rotated each about its own axis only. The drill crowns sit on drill rods provided with guide means such as tubes which are driven into the ground substantially simultaneously as the drill crowns. The guide means may be connected together to form a single common guide structure. When drilling two or more holes situated adjacent one or more previously drilled holes, a guide means having spacer means is inserted into a previously drilled hole, said spacer means guiding the drill for the further holes relative to the previously drilled hole by engagement with the residual walls of the drilled hole. The invention also refers to a drilling machine comprising two or more drill crowns for carrying out the above method.
A method of making holes of selective external configuration in a rock or earth formation, comprising the steps of providing two or more rotatable drills each provided with drill crowns, by arranging the drill crowns on drill rods and providing guide means around said drill rods, each drill crown being arranged to drill a hole, which holes together have a smaller total area than the area of the finished hole, positioning the rotatable drills adjacent to each other so that the drill crowns will touch each other or are radially spaced a small distance from each other and positioning the rotatable drills so that the drill crowns are substantially on the same level with each other, driving said rotatable drills into the ground, simultaneously displacing the drill crowns axially while rotating each of the drill crowns about its own axis only, and driving the guide means into the ground substantially simultaneously with the drill crowns.
A drilling machine comprising two or more rotatable boring means for boring holes, each of said boring means provided with a bore crown, drill rods, means for mounting the bore crowns on said drill rods, guide means for guiding the drill rods and means for joining the guide means to one another, means for positioning said bore crowns substantially at the same level and for arranging said bore crowns in such close adjacent relationship that they touch each other or are located at a small radial distance from each other, means for driving said bore crowns into the ground, means for axially displacing said bore crowns simultaneously with said driving means, means for rotating each bore crown about its own axis only, and a sinker drill wherein the guide means further comprises means for embracing said sinker drill.
A drilling machine comprising two or more rotatable boring means for boring holes, each of said boring means provided with a bore crown, means for positioning said bore crowns substantially at the same level and for arranging said bore crowns in such close adjacent relationship that they touch each other or are located at a small radial distance from each other, means for driving said bore crowns into the ground, means for axially displacing said bore crowns simultaneously with said driving means, for rotating each bore crown about its own axis only wherein said boring means comprises a plurality of sinker drills, neck adapter means connected to said sinker drills, jointed rods, jointing sleeve means for joining said neck adapter means to said jointed rods guide means located beneath the jointing sleeve means, wherein said guide means is subjected to an impact force from the jointing sleeve means.
Dependencies are inferred from the claim text.