WO1994023181A1 - Hydraulic jack hammer, for example for marine sampling - Google Patents
Hydraulic jack hammer, for example for marine sampling Download PDFInfo
- Publication number
- WO1994023181A1 WO1994023181A1 PCT/NO1994/000067 NO9400067W WO9423181A1 WO 1994023181 A1 WO1994023181 A1 WO 1994023181A1 NO 9400067 W NO9400067 W NO 9400067W WO 9423181 A1 WO9423181 A1 WO 9423181A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- tube
- piston
- impact device
- slide
- Prior art date
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 6
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 230000002706 hydrostatic effect Effects 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims description 14
- 239000013049 sediment Substances 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims 10
- 239000010959 steel Substances 0.000 claims 10
- 230000003472 neutralizing effect Effects 0.000 claims 2
- 238000012856 packing Methods 0.000 claims 2
- 238000010276 construction Methods 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000005381 potential energy Methods 0.000 abstract description 3
- 230000035515 penetration Effects 0.000 description 6
- 101100293261 Mus musculus Naa15 gene Proteins 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000036967 uncompetitive effect Effects 0.000 description 1
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
- E21B25/18—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being specially adapted for operation under water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
- B25D9/14—Control devices for the reciprocating piston
Definitions
- the invention concerns a hydraulic, especially a hydrostatic impact device, for example for marine sampling or for pile driving, according to the introduction to claim 1.
- the impact device according to the invention is used in order to drive a sampler tube down into the sedimentary layers on the seabed, the tube thus being more or less filled with samples of the sediments, which can then be pulled up to the surface together with the sampler.
- samplers of this kind in the prior art, of which two main types are most common.
- the gravitation sampler is based on the principle that weights are placed around an extension of the sampler tube, and that a device causes the weights with the sampler tube to fall freely from a height of 10-15 m above the seabed.
- a device causes the weights with the sampler tube to fall freely from a height of 10-15 m above the seabed.
- gravitation samplers There are several varieties of gravitation samplers, of which one group is the so-called piston corer which is characterized in that a piston is provided inside the actual sampler tube. The piston is connected to a surface vessel by a wire or the like, and this wire holds the piston approximately steady on a level with the seabed, while the weights drive the sampler tube closely past the piston and down into the sediments.
- the second main type of marine sampler is based on the principle that the sampler tube is located on a support frame which is lowered down to the desired position on the seabed, whereupon a mass which is placed on top of the sampler tube is caused to vibrate by means of an electrical or hydraulic motor.
- the vibrocorers have proved to be much more suitable than the gravitation samplers in hard sediments, but correspondingly uncompetitive in soft sediments where very long samples are desirable.
- the disadvantages with the vibrocorers have been that the support frame becomes large, heavy and unwieldy when it has to be adapted to long sampler tubes. Moreover the energy transfer from the surface vessel to the electrical or hydraulic vibration motor becomes problematic at great depths.
- This problem is solved according to the present invention by providing between the piston cylinder and the sampler tube, pile or other tool, a jump slide valve which between two extreme positions permits free axial movement of the impact device relative to a sampler tube, a pile or another tool, thus enabling the entire impact device to continue the drop hammer's upwardly directed movement after the completion of the cylinder's lifting stroke, until the upwardly directed kinetic energy is exhausted and a drop higher than the lifting cylinder's stroke length can begin.
- a jump slide valve which between two extreme positions permits free axial movement of the impact device relative to a sampler tube, a pile or another tool, thus enabling the entire impact device to continue the drop hammer's upwardly directed movement after the completion of the cylinder's lifting stroke, until the upwardly directed kinetic energy is exhausted and a drop higher than the lifting cylinder's stroke length can begin.
- the energy in the drop is also substantially increased.
- the problem with an upwardly directed impact is eliminated, resulting in improved sample quality.
- the invention according to the present application employs, as in PCT/N092/- 00078, an impact motor consisting of a piston cylinder with an attached stroke valve mechanism which automatically opens the filling valve when the piston reaches its top position, and which moreover automatically closes the filling valve and simultaneously opens the drain valve when the piston reaches its bottom position.
- a problem with the designs in PCT/NO92/00078 has been that at relatively great depths, the external water pressure influences the piston rod below the opening in the bottom of the piston cylinder in such a manner that the piston is pressed into its top position, thereupon activating the inlet valve and starting the impact device regardless of whether the sampler has reached the bottom or not.
- a piston rod consisting of an upper section above the piston and a lower section below the piston, the upper section extending in a tight opening through the top of the cylinder to the high pressure reservoir, and the lower section extending in a tight opening through the bottom of the cylinder to an area, e.g. a secondary cylinder, where it is exposed to the pressure in the surrounding liquid, the openings through the top and bottom of the cylinder respectively having approximately the same cross section, and the surrounding liquid possibly being permitted access to the high pressure reservoir and the secondary cylinder, with the result that the axial components of the pressure forces influencing the piston rod above the top of the cylinder and below the bottom of the cylinder respectively neutralize each other.
- the length of the tubes of the gravitation samplers and the vibrocorers are often so moderate that the entire length of sampler and tubes can be lifted in an ordinary A-frame which is often to be found at the stern section of the surface vessel. If this has not been possible, there have often been used - except in the case of vibrocorers - various types of "cribs" for sampler with tubes, where the cribs are hinged about a horizontal axis, can be pivoted between a horizontal and a vertical position either behind the stern or along the. rail of the vessel, and provide a rigid support for the sampler with tubes also in the horizontal position. These cribs are relatively heavy and unwieldy, especially in bad weather and if the tubes are extra long.
- Fig. 1 is an arrangement of the impact device according to the invention completely assembled, in an entirely lifted position with the jump slide valve completely extended (on the left) and immediately after a drop (on the right) respectively.
- Fig. 2 illustrates the impact device in use as a marine, hydrostatic sampler.
- Fig. 3a illustrates an embodiment of details of the impact device according to the invention.
- Fig. 3b illustrates a detail in fig. 8 in another position.
- Fig. 4a illustrates an embodiment of the valve mechanism used in the impact device according to the invention with open filling valve and closed drain valve respectively.
- Fig. 4b illustrates an embodiment of the valve mechanism in fig. 4a, but with closed filling valve and open drain valve.
- Fig. 5a-b illustrates a second embodiment of the said valve mechanism.
- Fig. 6 illustrates a third embodiment of the said valve mechanism.
- Fig. 7 illustrates an embodiment of the blowout valve used in the impact device according to the invention.
- Fig. 8 illustrates an embodiment of a tip of the sampler tube used in the impact device according to the invention.
- the drop is the term used for the sum of the drop stroke in the piston (which comprises the drop hammer) and the return of the jump stroke (which comprises the entire impact device,).
- the drop hammer covers all parts which drop relative to the piston when the filling valve closes and the drain valve opens. In practice this will include most of the mass in the impact device together with any water which may have entered the low pressure chamber (33) during previous impacts, but, e.g. not the piston, piston rod, toggle joint and slide valve.
- the drop stroke is the term used for the relative movement between the drop hammer and the piston when the filling valve closes and the drain valve opens.
- the filling valve is the term used for that part of the stroke valve (6) which opens or closes between the high pressure reservoir (32) and the piston cylinder's upper chamber (34).
- the jump stroke is the term used for the relative movement between the impact device and the sampler tube which is permitted by the jump slide valve.
- the jump slide valve is the term used for the slide valve which is described in the main claim and which can convert the drop hammer's kinetic energy to potential energy for the entire impact device, by permitting further axial movement after the piston cylinder has completed its lifting stroke.
- the high pressure reservoir is the term used for the space (32) from which the filling valve obtains liquid under pressure in order to perform the lifting stroke.
- the high pressure reservoir When the impact device is operated hydrostatically the high pressure reservoir is openly connected with the surrounding liquid and has approximately the same pressure as this. When the impact device is operated hydraulically the high pressure reservoir is closed to the surrounding liquid and instead connected to a high pressure pump directly or via a hose suited to this purpose.
- the low pressure chamber, the low pressure reservoir indicate a volume of air or other gas (33) which is connected to the drain valve and the piston's lower chamber (35) directly or via hoses and pipes suited to this purpose.
- the low pressure chamber When the impact device is operated, the low pressure chamber will be partially filled with liquid under rising pressure, until the pressure difference between the low pressure chamber (33,35) and the high pressure chamber (32) becomes too small to perform the lifting stroke.
- the lifting stroke is the term used for the hydraulic or hydrostatic piston motor movement which results from the opening of the filling valve and the closing of the drain valve, the drop hammer being raised and/or the piston being pressed downwards, depending on the resistance in the sediments.
- “Surrounding liquid” describes the medium, e.g. sea water or fresh water, into which the impact device is submerged and which supplies the hydrostatic pressure required for hydrostatic operation. "The impact device”
- the piston valve comprises the sum of the filling valve and the drain valve, whether 5 these are assembled into a unit or not.
- the piston valve can also be called the stroke valve, since it controls the piston's stroke movement.
- the drain valve is the term used for that part (52) of the stroke valve (6) which opens or closes between the piston cylinder's upper chamber (34) and the 10 low pressure reservoir (33).
- the blowout valve is the term used for the valve which is described in claims 7 - 9.
- the valve slide is the term used for a slide in the stroke valve, and should not be 15 confused with, e.g., the jump slide valve or slide valves in the blowout valve.
- the invention can also be used for pile driving or other activities where impact energy is implemented.
- the impact device includes, e.g., a gas reser ⁇ voir, a piston cylinder, a valve or the like
- a number of one or more of these components there can, e.g., be 30 envisaged a plurality of piston cylinders which are provided around a through- going slide valve in order thereby to save space.
- a plurality of low pressure chambers e.g. in the form of empty standard gas bottles arranged around the piston cylinder in varying numbers according to requirements.
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU64384/94A AU6438494A (en) | 1993-03-26 | 1994-03-25 | Hydraulic jack hammer, for example for marine sampling |
EP94912100A EP0642625A1 (en) | 1993-03-26 | 1994-03-25 | Hydraulic jack hammer, for example for marine sampling |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO931157A NO931157L (en) | 1993-03-26 | 1993-03-26 | Hydraulic impact hammer, for example for marine sampling |
NO931157 | 1993-03-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994023181A1 true WO1994023181A1 (en) | 1994-10-13 |
Family
ID=19895966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO1994/000067 WO1994023181A1 (en) | 1993-03-26 | 1994-03-25 | Hydraulic jack hammer, for example for marine sampling |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0642625A1 (en) |
AU (1) | AU6438494A (en) |
NO (1) | NO931157L (en) |
WO (1) | WO1994023181A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998015713A1 (en) * | 1996-10-07 | 1998-04-16 | Aardal Kaare | Hydrostatic penetration device and tool for the same |
WO1998020257A1 (en) * | 1996-11-07 | 1998-05-14 | Selantic Industrier A/S | Inverted accumulator |
AU2008207613B2 (en) * | 2004-11-24 | 2011-09-22 | Carter Holt Harvey Limited | Tree Stem Or Log Appraising Apparatus |
CN112065380A (en) * | 2020-10-20 | 2020-12-11 | 中国电建集团成都勘测设计研究院有限公司 | Large-buried-depth narrow-channel shaft electric sampling device and sampling method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3118417A (en) * | 1962-07-30 | 1964-01-21 | Stanwick Tad | Method and apparatus for anchor embedment |
US3412814A (en) * | 1967-06-28 | 1968-11-26 | Usa | Hydrostatic corer |
US4964473A (en) * | 1988-03-15 | 1990-10-23 | Ihc Holland N.V. | Method for driving a hydraulic submerged tool |
-
1993
- 1993-03-26 NO NO931157A patent/NO931157L/en unknown
-
1994
- 1994-03-25 WO PCT/NO1994/000067 patent/WO1994023181A1/en not_active Application Discontinuation
- 1994-03-25 EP EP94912100A patent/EP0642625A1/en not_active Withdrawn
- 1994-03-25 AU AU64384/94A patent/AU6438494A/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3118417A (en) * | 1962-07-30 | 1964-01-21 | Stanwick Tad | Method and apparatus for anchor embedment |
US3412814A (en) * | 1967-06-28 | 1968-11-26 | Usa | Hydrostatic corer |
US4964473A (en) * | 1988-03-15 | 1990-10-23 | Ihc Holland N.V. | Method for driving a hydraulic submerged tool |
Non-Patent Citations (1)
Title |
---|
Marine Geology, Volume 54, 1983, (Amsterdam), F.W. McCOY et al., "The Hydrostatic Corer", page 1433 - page 1441. * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998015713A1 (en) * | 1996-10-07 | 1998-04-16 | Aardal Kaare | Hydrostatic penetration device and tool for the same |
US6196333B1 (en) | 1996-10-07 | 2001-03-06 | Norcon Ag | Hydrostatic penetration device and tool for the same |
WO1998020257A1 (en) * | 1996-11-07 | 1998-05-14 | Selantic Industrier A/S | Inverted accumulator |
AU2008207613B2 (en) * | 2004-11-24 | 2011-09-22 | Carter Holt Harvey Limited | Tree Stem Or Log Appraising Apparatus |
CN112065380A (en) * | 2020-10-20 | 2020-12-11 | 中国电建集团成都勘测设计研究院有限公司 | Large-buried-depth narrow-channel shaft electric sampling device and sampling method |
CN112065380B (en) * | 2020-10-20 | 2023-07-18 | 中国电建集团成都勘测设计研究院有限公司 | Electric sampling device and sampling method for shaft with large buried depth and narrow channel |
Also Published As
Publication number | Publication date |
---|---|
NO931157L (en) | 1994-09-27 |
EP0642625A1 (en) | 1995-03-15 |
AU6438494A (en) | 1994-10-24 |
NO931157D0 (en) | 1993-03-26 |
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