Classifications

• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
  • E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe

Definitions

• the invention relates to a drill device for drilling in soil, comprising a soil drill and a drive for a rotating and/or vibrating drive of the soil drill.
• a drill device for drilling in soil comprising a soil drill and a drive for a rotating and/or vibrating drive of the soil drill.
• a sampling device including sampling pipe is lowered from a cable through the drill pipe and secured behind the drill head.
• the drill head is provided with an internal supporting edge on which the sampling pipe will stand.
• the position of the sampling device is locked by means of a hook at the upper side of the sampling device, which hook engages behind a dedicated hooking edge within the soil drill.
• the internal supporting edge is regularly covered in pieces of soil material that were drilled loose, as a result of which the sampling device is unable to be lowered deep enough for letting the hook engage.
• ample tolerance is applied for the position of the hooking edge relative to the supporting edge.
• the sampling device and the hook may enter into resonance frequencies that differ from each other. Within the required tolerance, said resonance frequencies develop sufficient dynamic forces to break down both the sampling device and the hook as a result of vibrations, within seconds.
• the invention provides a drill device for drilling in a soil, comprising a soil drill and a drive for a rotating and/or vibrating drive of the soil drill, wherein the soil drill is provided with an elongated hollow drill pipe having a drill head at its outer end, wherein the drill device is furthermore provided with an elongated tool holder for bringing a tool connected thereto into the soil drill, and a hoisting cable for lowering and hoisting the tool holder, wherein the tool holder comprises a clamping section and an operation section for the clamping section, wherein the clamping section is provided with clamping shoes that are movable in radial direction for clamping engagement onto the inner wall of the hollow drill pipe, and wherein the operation section is adapted for activating the radial motion of the clamping shoes.
• the drill device according to the invention is provided with a tool holder with clamping shoes that engage onto the inner wall of the hollow drill pipe so as to clamp radially to the outside, as a result of which a tolerance-free, force-closed connection between the drill pipe and the tool holder is obtained onto which dynamic forces have less to no influence at all.
• the drill device including the tool holder and the tool coupled thereto are resistant to vibrations at sonic and subsonic frequencies.
• the tool for instance is a sampling device for taking a soil sample.
• the clamping section is provided with a tensioning rod that is movable in the longitudinal direction of the tool holder, wherein the clamping shoes and the tensioning rod are provided with wedge surfaces that cooperate with each other for converting the motion of the tensioning rod into the radial motion of the clamping shoes.
• the clamping section is provided with a pipe having openings in the circumferential wall, wherein the clamping shoes are movably accommodated in the openings.
• the clamping shoes are able to retract behind the circumferential wall so that the tool holder including the tool connected thereto can be lowered through the hollow drill pipe unimpeded.
• the pipe and the clamping shoes are provided with recesses extending in circumferential direction in which recesses spring rings are accommodated that urge the clamping shoes in the openings.
• the spring rings follow the radial motion of the clamping shoes towards the inner wall of the drill pipe.
• clamping shoes are provided with inserts of hardened steel that come into abutment with the inner wall of the drill pipe.
• the clamping shoes are provided with distributed teeth that come into abutment with the inner wall of the drill pipe, so that a high peak tension and thus a large gripping force on the teeth is acguired.
• the operation section comprises a first pneumatically actuated piston that is operationally connected to the clamping shoes for moving the clamping shoes in radial direction.
• the first piston is connected to the tensioning rod.
• the operation section comprises a first coupling and attached to the hoisting cable is a second coupling, wherein the first coupling and the second coupling are adapted for detachable coupling cooperation in the drill pipe.
• the operation section is provided with a release pin for closing off and releasing compressed air to the first piston, wherein the release pin is oriented towards the second coupling and the connected second coupling keeps the release pin in the closed-off position.
• the release pin automatically releases the compressed air to the first piston, as a result of which the clamping shoes are moved to the outside and the tool holder and the tool connected thereto are secured.
• the operation section is provided with a safety pin that can be taken out and that keeps the release pin in the closed-off position when the first and the second coupling are out of the coupling cooperation. Shortly before the actual lowering of the tool holder including the tool connected thereto, the safety pin can then be pulled out in order to counteract undesired activation of the first piston.
• the first coupling is movable in the longitudinal direction of the tool holder relative to the clamping section
• the operation section comprises a release device connected to the first coupling, wherein the first coupling is biased in the direction of the clamping section and the release device is adapted for moving the clamping shoes back after overcoming a threshold value for a tensile force exerted on the first coupling via the hoisting cable and the second coupling.
• the tool holder including the tool connected thereto can be retrieved from the drill pipe via the hoisting cable, wherein the soil drill itself can be left behind in the soil for drilling deeper into the soil.
• the first coupling is connected to a second pneumatically actuated piston that can be biased by means of compressed air for setting the threshold value.
• the tool is a sampling device, so that soil samples can be taken in the drill pipe .
• the sampling device comprises a sample cutting section, wherein the sample cutting section is provided with an accommodation chamber and an inlet opening for accommodating the soil sample via the drill head.
• the sampling device is adapted for taking water samples.
• the tool is a drill device having a drill head.
• Said drill head can for instance temporarily be deployed for increasing the drilling capacity .
• the tool is a drill device having a displacing drill head.
• the tool is a drill device having a crushing drill head.
• the tool is an injection device for introducing material into the soil.
• the tool is a measuring device for measuring or determining soil mechanical properties, geophysical properties or pollution.
• the tool is a detection device for detection of minerals, ores or metals in the soil .
• Figure 1 shows a schematic view of a sonic drill device including a sampling device according to the invention
• Figures 2A and 2B show an isometric view and a longitudinal section of the sampling device according to figure 1;
• Figures 2C and 2D show details of the longitudinal section according to figure 2B.
• Figures 3A-3D show the successive steps for taking a soil sample using the sampling device according to the invention.
• FIG 1 schematically shows a soil drill device 1 for sampling and drilling soil, in this example a rocky soil 7, at great depth.
• the soil drill device 1 comprises a carriage 2 and a drill string 3 connected thereto.
• the drill string 3 is provided with a drill drive 4 to which a soil drill 5 having centre line SI is attached.
• the soil drill 5 comprises a steel drill pipe 6 built up from coupled pipe segments 8 and has a drill head 10 at the outer end.
• the drill drive 4 is adapted for bringing the soil drill 5 into vibration so as to translate, in direction A parallel to the longitudinal axis S and allowing the soil drill 5 to rotate in direction B about the longitudinal axis SI. Vibration takes place at a frequency of approximately 150 Hertz.
• This type of drilling is also called sonic drilling and is suitable for drilling into various soil types, including hard or rocky soils, down to typically a depth of 50-100 meters.
• a sampling device 20 included in the drill pipe 6 is a sampling device 20 according to the invention described below in detail, having a second centre line S2 for taking soil samples.
• the sampling device 20 comprises, in series, a tool, in this example a sample cutting section 30, and subsequently a clamping section 40 and an operation section 60 that form a tool holder to which the tool is connected.
• a tool in this example a sample cutting section 30, and subsequently a clamping section 40 and an operation section 60 that form a tool holder to which the tool is connected.
• the sample cutting section 30 can also be another tool connected to or coupled with the clamping section 40.
• examples of other tools are a soil displacing drill head, a crushing drill head, an injection device, a sampling part for taking water samples or a measuring device for measuring or determining soil mechanical properties, geophysical soil properties or pollution, or a detection device for detection of minerals, ores or metals in the soil.
• the sample cutting section 30 comprises a first straight cylindrical steel pipe 31 defining an end face 32 and an inlet opening 33 of the sampling device 20, wherein the inlet opening 33 provides access to a further closed-off cylindrical accommodation chamber 34.
• flexible fingers can be disposed for keeping a received soil sample in the accommodation chamber 34.
• the drill head 10 is provided with an internal supporting edge 11 for abutment against the head surface 32.
• the clamping section 40 comprises a second straight cylindrical steel pipe 41 that at its lower side is welded to a first steel screw piece 42 and that at its upper side is welded to a second steel screw piece 54.
• the first screw piece 42 and the first pipe 31 are provided with external and internal thread, respectively, with which the first pipe 31 of the sample cutting section 30 or of another tool is detachably screwed to the first screw piece 42.
• the second pipe 41 is provided with two elongated openings 43 extending in the longitudinal direction having a rectangular contour in which steel clamping shoes 44 have been accommodated.
• the clamping shoes 44 are straight opposite each other in circumferential direction.
• the clamping shoes 44 On the outside the clamping shoes 44 have a cylindrical outer surface 45 forming a continuation of the outer surface of the second pipe 41.
• the clamping shoes 44 are provided with recesses in which clamping pieces 46 of hardened steel are situated.
• the clamping pieces 46 are provided with series of projecting hard teeth 47.
• the clamping shoes 44 and the second pipe 41 are provided with grooves jointly extending in circumferential direction, in which grooves spring rings 48 are positioned so as to be recessed.
• the spring rings 48 keep the clamping shoes 44 confined in the elongated openings 43 and from said retracted position allow a radial external movement of the clamping shoes 44 in direction C transverse to the second centre line S2.
• the clamping shoes 44 comprise a series of first wedge surfaces 50 on the inside, which surfaces are a few degrees inclined to the longitudinal direction or the second centre line S2.
• a tensioning rod 51 is accommodated that on the outside is provided with series of second wedge surfaces 52 against which the first wedge surfaces 50 are held.
• the tensioning rod 51 can be moved up and down in direction D parallel to the second centre line S2.
• the operation section 60 comprises a third straight cylindrical steel pipe 61.
• the second screw piece 54 and the third pipe 61 are provided with external and internal thread, respectively, with which the third pipe 61 is detachably screwed to the second screw piece 54.
• the second screw piece 54 is provided with a first bore hole 55 in which a first piston 56 is bearing mounted so as to be able to slide up and down in direction D.
• a first piston 56 is bearing mounted so as to be able to slide up and down in direction D.
• a sealing ring 57 is attached at the lower side.
• the first piston 56 is biased to a position in which the tensioning rod 51 keeps the clamping shoes 44 retracted as shown in figure 2D.
• the operation section 60 comprises a fourth straight cylindrical steel pipe 62 that is accommodated in the third pipe 61 with space surrounding it.
• the fourth steel pipe 62 is attached airtight to a third steel screw piece 63.
• the third screw piece 63 and the fourth pipe 62 are provided with external and internal thread, respectively, with which the third screw piece 63 is screwed airtight in the fourth pipe 62.
• the fourth pipe 62 is attached to a first steel duct part 65.
• the first duct part 65 and the fourth pipe 62 are provided with external and internal thread, respectively, with which the fourth pipe 62 is screwed airtight to the first duct part 65.
• a storage pressure vessel 66 is defined in the operation section 60.
• the first duct part 65 is furthermore provided with external and internal thread, respectively, with which the duct part 65 is detachably screwed in the third pipe 61.
• a second steel duct part 70 is secured in the first duct part 65.
• the first duct part 65 and the second duct part 70 are both shown in detail in figure 2C.
• the second duct part 70 is provided with a second bore hole 72 in which a second piston 71 is bearing mounted so as to be slidable in direction E.
• the second piston 71 is provided with a widening 73 having a sealing ring 74 that seals airtight against a third bore hole 75 in the first duct part 65.
• the second piston 71 has a sealing pin 76 that projects downwards from the widening 73, which sealing pin extends in a first air duct 77 having a sealing in the first duct part 65 leading to the air storage vessel 66.
• the hollow piston 71 provides a continuous internal second air duct 79 having a free outlet opening 78 above the second duct part 70. At the upper side the piston 71 is closed off by means of an arrow-shaped first steel coupling part 80 attached thereto.
• the first duct part 65 and the second duct part 70 jointly have a third air duct 83 extending downwards from the upper side of the first duct part 65 and forming a connection with the space above the widening 73 of the second piston 71 and with the air storage vessel 66.
• the third duct 83 is closed off by means of a one-way valve 84 screwed in the second duct part 70, which one-way valve has a connecting nipple 85.
• the first duct part 65 and the second duct part 70 jointly have a fourth air duct 90 that at the lower side debouches in the space between the third pipe 61 and the fourth pipe 62 and that at the upper side debouches in a third bore hole 92 in the first duct part 65 and the second duct part 70.
• the third bore hole 92 is in connection with the space above the widening 73 of the second piston 71.
• a release pin 91 is accommodated that can be moved in direction F and that in the lowest position shown provides an airtight closure of the connection between the fourth air duct 90 and the space above the widening 73.
• the second duct part 70 is provided with a fourth bore hole 95 in which a safety pin 96 is inserted that can be taken out in direction G and that keeps the release pin 91 in the closed-off position.
• the first coupling part 80 forms a part of a coupling assembly known per se with which a sample cutting pipe suspended from a cable can be lowered through a drill pipe.
• the coupling assembly comprises a second coupling part 100 that is schematically shown in figures 2A and 3A.
• the second coupling part 100 is built up from a cylinder 101 for accommodation of the first coupling part 80 and claws 103 accommodated within the cylinder 101 for engagement behind the arrow head of the first coupling part 80.
• the second coupling part 100 is connected to a hoisting cable 110 that is operated by a winch positioned on the carriage 2.
• the claws 103 can be released in the known manner by pulling the hoisting cable 110 in a pulsating manner.
• the second coupling part 100 is provided with a downwardly oriented bumper edge 102 that, in the coupled condition, is situated straight above the free upper end of the release pin 91.
• the drill pipe 6 is introduced into the soil 7 by coupling successive pipe segments 8 aboveground and by means of the drill drive 4, while rotating in direction B, vibrating them into the soil until the drill head 10 has reached a depth at which a soil sample is required.
• the sampling device 20 first needs to be prepared aboveground.
• the applied biasing force is amply sufficient to keep the piston 71 against the bottom when the sampling device 20 is suspended straight up from the first coupling part 80.
• the second coupling part 100 is coupled to the first coupling part by means of the claws 103 as shown per se in figure 3A, as a result of which the bumper edge 102 will come to be just above the safety pin 96.
• the release pin 91 with the upper side will come into abutment with the bumper edge 102. In this position the release pin 91 still keeps the air connection with the fourth air duct 90 closed off airtight and the sampling device 20 is ready to be lowered into the drill pipe 6.
• the sampling device 20 is introduced and lowered into the drill pipe 6 until the end face 32 is on the supporting edge 11 of the drill head 10.
• the hoisting cable 110 is pulled in a thrusting manner as a result of which the claws 103 release the first coupling part 80 while the sampling device 20 remains standing on the supporting edge 11 due to its own weight.
• the air pressure behind the release pin 91 pushes the release pin 91 upwards in direction F as a result of which the connection to the fourth air duct 90 is released.
• the space above the sealing ring 57 fills with the air under high pressure as a result of which the first piston 56 pushes the tensioning rod 51 downwards in direction D counter the biasing force of the helical spring 58.
• the cooperating wedge surfaces 50, 52 thus push the clamping shoes 44 in direction C radially to the outside, with the hard teeth 47 against the interior of the drill pipe 6.
• the position of the clamping shoes 44 is chosen such that they will press against a thickened and thus reinforced portion of the lowermost pipe segment 8.
• the sampling device 20 thus is secured in the drill pipe 6 in a tolerance-free manner by means of a force-closed engagement onto the interior of the drill pipe 6.
• the uncoupled second coupling part 100 is subsequently hoisted out of the drill pipe 6 by means of the hoisting cable 110, after which drilling is resumed over a distance sufficing to accommodate a column of undisrupted or virgin soil 7 in the accommodation chamber 34, which column if necessary, will be retained by the flexible fingers in the accommodation chamber 34.
• the drill pipe 6 itself can remain sitting in the soil and directly after hoisting the sampling device 20 be used for drilling deeper or for taking a next soil sample.

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Geology (AREA)
• Mining & Mineral Resources (AREA)
• Physics & Mathematics (AREA)
• Environmental & Geological Engineering (AREA)
• Fluid Mechanics (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Sampling And Sample Adjustment (AREA)
• Earth Drilling (AREA)
• Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

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Cited By (7)

Family Cites Families (2)

• 2012
  • 2012-04-05 NL NL2008610A patent/NL2008610C2/nl active
• 2013
  • 2013-04-03 WO PCT/NL2013/050250 patent/WO2013151435A2/fr not_active Ceased

Non-Patent Citations (1)

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