EP0524280B1 - Entrainement de marteau-pilon - Google Patents

Entrainement de marteau-pilon Download PDF

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Publication number
EP0524280B1
EP0524280B1 EP92903420A EP92903420A EP0524280B1 EP 0524280 B1 EP0524280 B1 EP 0524280B1 EP 92903420 A EP92903420 A EP 92903420A EP 92903420 A EP92903420 A EP 92903420A EP 0524280 B1 EP0524280 B1 EP 0524280B1
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EP
European Patent Office
Prior art keywords
rotation
shafts
drop hammer
rollers
driven
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Expired - Lifetime
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EP92903420A
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German (de)
English (en)
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EP0524280A1 (fr
Inventor
Raymond Andina
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Individual
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Individual
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/02—Placing by driving
    • E02D7/06—Power-driven drivers
    • 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
    • E21B1/00—Percussion drilling
    • E21B1/02—Surface drives for drop hammers or percussion drilling, e.g. with a cable
    • E21B1/04—Devices for reversing the movement of the rod or cable at the surface
    • 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
    • E21B1/00—Percussion drilling
    • E21B1/38—Hammer piston type, i.e. in which the tool bit or anvil is hit by an impulse member

Definitions

  • the present invention relates to a device for intermittently advancing a boring bar or measuring probe by means of a monkey or ram with a striking mechanism, comprising the monkey or ram and two roller-like rollers with horizontal axes of rotation arranged symmetrically on opposite sides of the monkey, at least one of the rollers being driven, by means of which rollers the monkey is driven upwards; with a method for adjusting the drop height of the drop hammer on a device, and with a drilling or penetration arrangement with a device.
  • Drilling or Penetration devices resp. Arrangements for guiding, holding and driving drilling and measuring probes are known from Swiss patent 465 512 and French patent application FR-A-2 650 011. If possible, the drilling process is carried out statically, i.e. a drilling or measuring probe is continuously driven underground with constant or increasing force.
  • the drilling or measuring probe is pushed in steps by means of a rhythmic resp. periodically falling monkey or battering ram, which hits the top of a boring bar by its own weight is dropped.
  • a rhythmic resp. periodically falling monkey or battering ram which hits the top of a boring bar by its own weight is dropped.
  • such drilling rigs in which a monkey is used to drill or penetrate a probe in the subsurface, are very large, but are suitable for the lifting process of a monkey with a large weight. Rammbär's robust constructions and strong lifting devices are necessary.
  • a lifting device resp. proposed a striking mechanism for a drop hammer, which is relatively small and by means of which the drop height and drop frequency can be adjusted.
  • the monkey is lifted on the striking mechanism by two rotating rollers with horizontal axes of rotation arranged symmetrically on opposite sides of the monkey, at least one of which is driven.
  • the rollers clamp the monkey during the lifting process in order to drive the monkey upwards by rotating the at least one roller and the rolling friction generated by the clamping. So that the drop hammer can drop down periodically, the two rollers point symmetrically to each other each segment-like on a surface section that has a somewhat reduced radius, so that the monkey is not pinched along this segment.
  • Such a striking mechanism is described for example in US-A-2 869 824.
  • the monkey is clamped by two symmetrically arranged rotating rollers, these rotating rollers having surface segments with two different radii.
  • the rollers are arranged pretensioned with respect to one another, but the pretension is limited so that the pinching effect is canceled in each case when the set-back surface parts roll along the drop hammer, whereby the pinching effect is canceled.
  • the drop hammer is periodically driven upwards or dropped again by the rotation process of the two rollers.
  • the disadvantage of the proposed percussion mechanism is that the drilling or.
  • Penetration process must be interrupted in order to replace the rollers, since the height of fall depends on the choice of the circumferential length of the segment with the larger cross-sectional radius on the rollers. In the case of rapidly changing soil conditions, however, this is a disadvantage, since with any soil condition or Soil consistency, the drop height has to be changed and the drilling for the roller change has to be interrupted.
  • What is proposed is a device for pushing a boring bar or measuring probe in steps by means of a monkey or ram with a striking mechanism, the striking mechanism comprising the monkey or ram itself, and two roller-like rollers arranged symmetrically on opposite sides of the monkey with an essentially circular cross section and with horizontal Axes of rotation, at least one of the rollers being driven, by means of which the monkey is driven upwards.
  • a releasable tensioning device is also provided on the striking mechanism device in order to drive the roller-like rollers against one another, so as to pinch the monkey or ram and drive it upward.
  • at least one of the two roller-like rollers is connected to the tensioning device and laterally displaceable with its axis of rotation for clamping or releasing the monkey with respect to the monkey, respectively.
  • the axis of rotation of the opposite roller is arranged and adjusting means are provided on the tensioning device in order to periodically adjust the intervals of tensioning. the release of the tensioning device in such a way so that the stroke duration of the monkey during tensioning or. determine the drop height of the falling monkey while loosening.
  • the tensioning of the clamping device causes the axis of rotation of the roller connected to the clamping device against the monkey, respectively. is driven against the axis of rotation of the opposite roller and that when released, the axis of rotation of this roller is driven away from the monkey.
  • the means provided for tensioning the tensioning device comprise two eccentrically designed camshafts arranged parallel to one another, whereby at least one of the axes of rotation of one of the cams is laterally displaceable with respect to the other axis of rotation, the shafts each having a cross section which is essentially circular in half and the other half is essentially quasi-elliptical, and at least one of the two Shafts is driven, and that the tensioning device is tensioned when the two surface segments of the two shafts with a circular cross section roll against each other and the tensioning device is released when at least one surface segment with a quasi-elliptical cross section rolls off one of the shafts at the line of contact of the two shafts or when the two waves don’t touch at all.
  • Quasi-elliptical is understood to mean any type of circumferential configuration whose radius is smaller than the circle radius.
  • the axes of rotation of both the rollers and the two shafts are preferably arranged essentially in one plane, preferably in a plane arranged transversely to the direction of fall of the monkey.
  • connection of the axes of rotation of the roller and shaft, which are arranged the most apart, is preferably via a so-called coupling frame, the frame comprising two laterally, essentially parallelogram-like laterally displaceable axis brackets on which the two axes of rotation are held or. are stored.
  • a spring arrangement is provided on the coupling frame in order to position the coupling frame when the tensioning device is released such that the axis of rotation of the roller or. the roller mounted on the coupling frame is driven away from the monkey so that it can fall freely.
  • the axis of rotation of that shaft which is arranged on the coupling frame or. is either driven coupled to the rotation of the axis of rotation of the other shaft, or frequency-coupled with the rotation of the axis of rotation of the other shaft in a rotationally reciprocating manner.
  • the clamping device With a full rotation of the driven, central shaft, the clamping device is always clamped as long as the circular surface segments of the two shafts roll against each other. As long as the tensioning device is tensioned, the monkey is driven upwards.
  • the maximum drop height thus results in the case where the two circular surface segments abut one another during a maximum path length when the central shaft rotates, and a minimum drop height results when the contact of the two circular surface segments is only of very short duration.
  • the device according to the invention with the hammer mechanism designed according to the invention is suitable for any drilling or penetration arrangement by means of which boring bars, drilling or measuring probes are driven into an underground.
  • a drilling or penetration arrangement with a device according to the invention is proposed, which is mounted on a flat, longitudinally constructed scaffold structure arranged on a substantially horizontal surface or a platform, with a chassis which is displaceable in the longitudinal direction, the arrangement being mounted in this way on the chassis that it can be pivoted from a substantially horizontal position for transport by 90 ° into a substantially vertical working position.
  • Fig. 1a is a conventional Bohrresp in perspective. Penetration arrangement shown as it was briefly appreciated in the prior art. In the drilling or. Penetration arrangement, the lifting process of the monkey is not carried out by means of a large-sized frame, but by means of the rotating rollers mentioned in the description, which are arranged laterally next to the monkey.
  • a drilling or. Penetration arrangement resp. a scaffolding A for holding and guiding a monkey 1 shown.
  • the monkey 1 itself is positioned by means of a cross strut la and guide rods 1b and kept sliding in the frame.
  • the monkey 1 is used to propel a boring bar 2 in an underground 2a.
  • the drilling or Penetration arrangement resp. the scaffold A is held on a sliding structure C, comprising longitudinal gliders 10a, on a platform or a base 8.
  • the sliding construction is therefore provided in order to be able to move the frame A laterally when the boring bars 2 are replaced.
  • the drilling stand A comprises a hammer mechanism 5, by means of which the lifting or. the falling process of the monkey 1 is accomplished and controlled.
  • the striking mechanism device 5 comprises the two roller-shaped rollers 5a already mentioned, which are each arranged on the side of the monkey 1.
  • a drilling or penetration arrangement is shown schematically in section seen from the side, in which a monkey or ram 1 drives a boring bar 2 into an underground 2a.
  • the drilling or penetration arrangement A with the monkey 1 is on brackets 3 and 4 respectively. attached to a chassis 9.
  • the drilling or penetration arrangement comprises a hammer mechanism 5, which is shown in detail in the following figures.
  • the percussion mechanism 5 is driven by means of a motor 6 and via drive means 7. operated.
  • the drilling or penetration arrangement A is arranged together with the chassis 9 on a platform 8, which can be, for example, a truck bridge.
  • a sliding structure 10 is further arranged, along which the chassis, respectively. the carriage 9 can be moved.
  • the drilling or penetration arrangement A can be arranged in a working position (shown with solid lines), and in a position B, pivoted into the horizontal, in which the drilling or Penetration arrangement is shown in dashed lines.
  • the vertical arrangement serves as a so-called working position for driving drilling or measuring probes, while the horizontal position B for transport, for example on a truck or using a lifting or crane device or a helicopter.
  • the monkey resp. Rammbär 11 is by means of two roller-like rollers 13, respectively. 15 driven upwards, for example by driving the roller 15 in the direction of the arrow by means of a drive 23.
  • the drive 23 can be a V-belt or a chain drive, for example.
  • the subsequent driving of the monkey 11 always takes place when it is pinched by the two rollers 13 or 15, respectively. when the two roller-like rollers are driven against each other.
  • the hammer mechanism according to FIG. 2 further comprises two cam-like shafts 22 and 24, each of which has an eccentric cross section.
  • the cross section of the two shafts is essentially half circular, (22a, 24a) and half is essentially elliptical, (22b, 24b).
  • the shaft 22 is also driven by the drive 23, which is preferably the same drive that is used for the rotation of the roller 15.
  • the axes of rotation 12 and 16 of the two rollers 13 and 15 and the axes of rotation 19 and 25 of the two shafts 22 and 24 are arranged in a plane which is horizontal, respectively. runs perpendicular to the direction of fall of the monkey 11.
  • the axis of rotation 12 of the roller 13 and the axis of rotation 25 of the shaft 24 are each mounted in brackets 30 and 35 by a coupling frame which is fixed via rotary bearings 32 and 36 on the drilling or. Penetration arrangement resp. held on the drilling rig (not shown).
  • the two mounting arms 30 and 35 are connected in a parallelogram-like manner via bearings 28 and 34 to a frame part 27, which runs laterally (FIG. 3) next to the monkey 11.
  • a spring arrangement 38 is arranged on the frame part 27, terminally in the area of the bearing 34, which is connected to the frame part 27 by means of an end termination 39.
  • the distance between the two axes of rotation 19 and 25 is maximum. Since the two axes of rotation 16 and 19 of the roller 15 and the shaft 22 are firmly fixed to the drilling or penetration arrangement, the axis of rotation 25 of the shaft 24 is driven away from the axis of rotation 19 accordingly by the maximum distance mentioned, with which the axis of rotation 25 is fixed connected holding arm 30 is driven in the same direction.
  • the coupling frame 27 connected to the holding arm 30 and the holding arm 35 also rotatably connected to the same are driven accordingly in the same direction.
  • the shaft 22 Simultaneously with the rotation of the roller 15, however, the shaft 22 also rotates and, accordingly, also the shaft 24 due to the rolling movement.
  • the shaft 24 moves in the direction of the arrow until point 24c of the circumference of the shaft 24 is reached.
  • the point 24c is of course not punctiform, but represents a line formed in the longitudinal direction parallel to the axis of rotation 25, since the shaft 24 is formed in the longitudinal direction.
  • the surface 22a of the shaft 22 now rolls on the elliptical surface 24b of the shaft 24, thus reducing the distance between the two axes of rotation 19 and 25.
  • the axis of rotation 25 shifts in the direction of the axis of rotation 19, with which the coupling frame is accordingly shifted in the same direction and thus the axis of rotation 12 of the roller 13 is connected.
  • the axis of rotation 12 of the roller 13 shifts away from the roller 15 , with which the drop hammer 11 is no longer pinched and thus falls freely down onto the upper end of a boring bar. Due to the enormous weight of the monkey, depending on the size of the system, for example between 200kg and 160kg or even more, this blow causes penetration the boring bars respectively. the drilling probe into the underground.
  • a spring arrangement 38 is further provided, which is firmly connected to the drilling or penetration arrangement via a fastening arrangement 39 and 39a. Accordingly, this spring arrangement 38 is compressed during the movement of the coupling frame 27 in the direction of the axis of rotation 25, and expands in the reverse process.
  • FIG. 3 the design of the coupling frame 27 is now shown schematically from above, with the representation of the rollers and shafts and the drop hammer being omitted in order to ensure greater clarity.
  • the coupling frame 27 comprises two longitudinal and two transverse webs in order to ensure that the monkey, which is moved upwards and downwards, is gripped around.
  • the two rotary joints 28 are arranged, via which the frame is connected to the holding arm 30 (not shown) and correspondingly to the shaft 24.
  • the two pivot joints 34 are arranged accordingly.
  • the longitudinal webs of the coupling frame 27 extend on the side of the swivel joints 34 through a further transverse web 39a, which is fixed to the drilling or penetration arrangement connected is.
  • a bolt 39b is fastened to the crossbar 39a and engages on the opposite side in the spring arrangement 38 which is fastened to the crossbar 27a by means of a fastening nut 39.
  • FIGS 4 and 5 schematically show once again how the coupling frame 27 is driven when the tensioning device is tensioned and when the tensioning device is released.
  • FIG. 6 shows schematically how the drop height of the drop hammer 11 can be adjusted.
  • the lifting process of the monkey begins. Now the two surfaces 22a and 24a roll against each other until the point 24c on the shaft 24 is reached. At this moment the tensioning device is relaxed again and the monkey falls down. Accordingly, the drop height of the drop hammer is determined by the track length 1. However, the stroke or Fall height of the drop hammer is not equal to 1, but also depends on the gear ratio or on the size (circumference) of the roll 15.
  • the drop height can either be set by rotating the two shafts 22 and 24 in a predetermined position relative to one another, or the shaft 24 can be set after the two have rolled circular surfaces are moved back to the starting position, whereby the shaft 24 carries out a rotation back and forth movement. Since the position of the shaft 24 in relation to the shaft 22 can now be changed at any time, it is now clear that the drop height can also be varied during the advance operation of a drilling probe without the drilling or penetration process having to be interrupted. As a rule, this varies in the order of magnitude from a few cm to 1m.
  • the percussion mechanism devices shown in FIGS. 1 to 6 are of course not limited to the examples shown, but can be changed or modified in any way.
  • the configuration of the elliptical surface segment can of course also be varied in any desired manner.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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  • Earth Drilling (AREA)

Abstract

Un dispositif permettant de faire avancer par intermittence une tige de forage ou une sonde de mesure au moyen d'un marteau-pilon (11), ou mouton, avec un système de percussion, comprenant le marteau-pilon (11), ou mouton, et deux rouleaux cylindriques (13, 15) disposés symétriquement sur les côtés opposés du marteau-pilon avec des axes de rotation horizontaux (12, 16), l'un des rouleaux au moins étant entraîné. Lesdits rouleaux servent à entraîner le marteau-pilon est entraîné vers le haut. Il comprend également un dispositif de serrage, pouvant être desserré, pour rapprocher l'un de l'autre les rouleaux cylindriques (13, 15) lorsqu'ils enserrent le marteau-pilon (11), ou mouton, de manière à lever le marteau-pilon.

Claims (9)

  1. Dispositif pour enfoncer par à-coups une tige de forage ou une sonde de mesure (2) à l'aide d'un marteau-pilon (1, 11) ou d'un mouton, pourvu d'un dispositif de percussion (5) comprenant le marteau-pilon (1, 11) ou le mouton et deux rouleaux en forme de cylindres (13, 15) qui sont disposés de façon symétrique sur les côtés opposés du marteau-pilon, qui sont pourvus d'axes de rotation horizontaux (12, 16), l'un au moins des rouleaux étant entraîné, et à l'aide desquels le marteau-pilon est poussé vers le haut, et enfin un dispositif de serrage apte à être relâché, destiné à entraîner les rouleaux en forme de cylindres (13, 15) l'un vers l'autre afin d'enserrer le marteau-pilon (11) ou le mouton et de l'entraîner vers le haut ou de le soulever, étant précisé que l'un au moins des rouleaux en forme de cylindres (13) qui est relié au dispositif de serrage est disposé pour être mobile latéralement, avec son axe de rotation (12), par rapport au marteau-pilon afin d'enserrer ou de libérer celui-ci, et que des intervalles périodiques de serrage et de relâchement du dispositif de serrage peuvent être réglés pour que la durée de la course du marteau-pilon lors du serrage ou la hauteur de chute du marteau-pilon qui retombe soit déterminée pendant le relâchement, caractérisé en ce que les rouleaux en forme de cylindres (13, 15) ont une forme ronde et en ce qu'il est prévu sur le dispositif de serrage des moyens de réglage (22, 24) pour régler le serrage et le relâchement, c'est-à-dire le soulèvement et la chute périodiques du marteau-pilon, étant précisé que le serrage a pour effet d'entraîner l'axe de rotation (12) du rouleau (13) relié au dispositif de serrage vers le marteau-pilon (11) et vers l'axe de rotation (16) du rouleau opposé (15), tandis que lors du relâchement, en conséquence, l'axe de rotation (12) de ce rouleau (13) est éloigné du marteau-pilon (11).
  2. Dispositif selon la revendication 1, caractérisé en ce que les moyens prévus pour serrer le dispositif de serrage comporte deux arbres à cames (22, 24) juxtaposés parallèlement et de forme excentrique, étant précisé que l'un au moins des axes de rotation (19, 25) de ces arbres à cames est disposé mobile latéralement par rapport à l'autre, lesdits arbres ayant une section transversale pour moitié (22a, 24a) globalement ronde tandis que l'autre moitié (22b, 24b) a une forme en retrait ou elliptique par rapport à la périphérie ronde, et étant précisé que l'un au moins des arbres (22) est entraîné, et en ce que le dispositif de serrage est serré lorsque les deux segments de surface des deux arbres à section ronde (22a, 24a) roulent l'un contre l'autre, tandis qu'il est relâché lorsqu'au moins un segment de surface (22b, 24b) à section quasi elliptique de l'un des arbres (22, 24) roule sur la ligne de contact des deux arbres ou lorsque les deux arbres ne se touchent pas.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les quatre axes de rotation (12, 16, 19, 25) des deux rouleaux (13, 15) et des deux arbres (22, 24) sont disposés globalement dans un plan, de préférence dans un plan disposé transversalement par rapport au sens de chute du marteau-pilon (11).
  4. Dispositif selon l'une des revendications 2 ou 3, caractérisé en ce que les deux rouleaux (13, 15) et les deux arbres (22, 24) sont disposés par paires et en ce que les axes de rotation du rouleau et de l'arbre le plus éloignés l'un de l'autre et ceux du rouleau et de l'arbre disposés au centre sont reliés entre eux, de sorte que lorsque les deux surfaces (22a, 24a) à section ronde des deux arbres (22, 24) se heurtent et que les deux axes de rotation (19, 25) des arbres sont ainsi éloignés par force l'un de l'autre, les axes de rotation (12, 16) des deux rouleaux (13, 15) sont entraînés l'un vers l'autre et le marteau-pilon (1, 11), enserré, est entraîné vers le haut.
  5. Dispositif selon la revendication 4, caractérisé en ce que les axes de rotation (12, 25) du rouleau (13) et de l'arbre (24) le plus éloignés l'un de l'autre sont reliés entre eux par un châssis d'accouplement (27, 30, 35), le châssis comportant deux montages sur paliers (30, 35) qui sont mobiles latéralement et en biais globalement à la manière d'un parallélogramme, transversalement par rapport au sens axial, et sur lesquels sont maintenus ou montés les deux axes de rotation (12, 25).
  6. Dispositif selon la revendication 5, caractérisé en ce qu'il est prévu un dispositif de ressort (38) sur le châssis d'accouplement afin de positionner ledit châssis, quand le dispositif de serrage est relâché, de telle sorte que l'axe de rotation (12) du rouleau (13) ou le rouleau (13) soit éloigné du marteau-pilon (11) et que celui-ci tombe librement vers le bas.
  7. Dispositif selon la revendication 5 ou 6, caractérisé en ce que l'arbre (24), dont l'axe de rotation (25) est disposé sur le châssis d'accouplement, est entraîné en rotation suivant un accouplement de mouvement avec l'axe de rotation (19) de l'autre arbre (22), ou est mobile suivant un mouvement de va-et-vient rotatif suivant un accouplement de fréquence avec la rotation de l'axe de rotation (19) de l'autre arbre (22).
  8. Procédé pour le réglage de la hauteur de chute du marteau-pilon sur un dispositif selon l'une des revendications 4 à 7, caractérisé en ce que grâce au positionnement mutuel des sections périphériques des deux arbres (22, 24) lors d'une rotation de l'arbre central entraîné (22), les deux surfaces de section transversale rondes (22a, 24a) des deux arbres se heurtent pendant une partie prédéfinie d'une rotation, moyennant quoi le dispositif de serrage est serré.
  9. Dispositif de forage ou de pénétration pourvu d'un dispositif selon l'une des revendications 1 à 7, caractérisé en ce qu'il est prévu une structure longitudinale plane (10) disposée sur un socle (8) globalement horizontal ou sur une plate-forme et pourvue d'un châssis (9) mobile dans le sens longitudinal, le dispositif étant monté sur le châssis de manière à pouvoir pivoter de 90° pour passer d'une position globalement horizontale pour un transport à une position de travail sensiblement verticale.
EP92903420A 1991-02-11 1992-02-05 Entrainement de marteau-pilon Expired - Lifetime EP0524280B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH416/91A CH683202A5 (de) 1991-02-11 1991-02-11 Fallhammerantrieb.
CH416/91 1991-02-11
PCT/CH1992/000024 WO1992014026A1 (fr) 1991-02-11 1992-02-05 Entrainement de marteau-pilon

Publications (2)

Publication Number Publication Date
EP0524280A1 EP0524280A1 (fr) 1993-01-27
EP0524280B1 true EP0524280B1 (fr) 1996-05-01

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EP92903420A Expired - Lifetime EP0524280B1 (fr) 1991-02-11 1992-02-05 Entrainement de marteau-pilon

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EP (1) EP0524280B1 (fr)
CH (1) CH683202A5 (fr)
WO (1) WO1992014026A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH682163A5 (en) * 1990-10-15 1993-07-30 Raymond Andina Borehole drilling rod supporting structure
KR100768686B1 (ko) * 2006-07-04 2007-10-23 박문하 토양시료 채취기

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774240A (en) * 1951-04-09 1956-12-18 Fur Grundwasserbauten Ag Soil testing apparatus
US2869824A (en) * 1957-03-26 1959-01-20 Raymond Int Inc Automatic drop weight for boring

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EP0524280A1 (fr) 1993-01-27
CH683202A5 (de) 1994-01-31
WO1992014026A1 (fr) 1992-08-20

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