EP0990765B1 - Percussive core barrel - Google Patents
Percussive core barrel Download PDFInfo
- Publication number
- EP0990765B1 EP0990765B1 EP99400428A EP99400428A EP0990765B1 EP 0990765 B1 EP0990765 B1 EP 0990765B1 EP 99400428 A EP99400428 A EP 99400428A EP 99400428 A EP99400428 A EP 99400428A EP 0990765 B1 EP0990765 B1 EP 0990765B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core tube
- hammer
- bits
- equipment according
- pressure fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011435 rock Substances 0.000 claims abstract description 57
- 239000012530 fluid Substances 0.000 claims abstract description 24
- 238000005520 cutting process Methods 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 7
- 125000006850 spacer group Chemical group 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
-
- 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
- E21B10/00—Drill bits
- E21B10/02—Core bits
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams
-
- 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
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
Definitions
- the present invention relates to an equipment for boring large diameter holes into rocks.
- large diameter holes mean holes having a diameter within the range of 1 to 3 metres and a depth within the range of one to 10 metres into the rock. Such holes are to be bored in the rock for foundation piles or other similar purposes.
- the surface of the rock may be at ground level or may be covered by up to 50 metres or more of soil. Where there is soil lying over the rock, a hole will be bored down to the rock by some other means, and held open by a steel casing or support fluid, or a combination of both. Then a specific equipment is used to drill the rock itself.
- a rock roller bit requires considerable downward force to be applied to the rollers to penetrate into the rock.
- the bit is normally attached to a drill pipe which is rotated by a machine at the ground surface. Vertical force is applied to the bit either by hydraulic rams pressing down on the drill pipe or by heavy collars attached to the drill pipe on top of the bit.
- the rollers are equipped with teeth or hemispherical buttons which crush the rock as they pass over its surface. Discs are also used for this purpose in very strong rock.
- a percussive drill penetrates into the rock at a much faster rate than a rock roller bit or a rock roller core barrel. It is normally operated by compressed air which drives a single large hammer and bit or a number of smaller hammers and bits arranged together in a cluster.
- the drill is normally attached to a drill pipe which is rotated by a machine at the ground surface and is also used to convey the compressed air to the hammer or hammers.
- the energy required to operate a percussive drill is much higher than for a rock roller bit or rock roller core barrel, but is needed over a much shorter period.
- Boring augers, toothed core barrels, digging buckets, cleaning buckets and chisels are used mainly for boring holes in weak rocks where acceptable progress can be made with this type of equipment. These tools, with the exception of the chisel, are normally attached to the Kelly bar of a piling rig. Chisels are raised and dropped in the hole either by a separate service crane or by the piling rig itself which may have hoisting facilities for this purpose.
- the present invention relates to a drilling equipment which allows the cutting of an annular ring in the rock.
- the object of the present invention is to provide a drilling equipment for boring large diameter holes into rock which combines the high speed of percussive drilling with the economy of boring out only a ring of rock around the perimeter of the hole instead of boring out the rock over its full diameter.
- the equipment for boring large diameter holes into the rock comprises :
- a plurality of hammer means provided with percussive bits (14b) for penetrating into the rock, each hammer means having a vertical axis and, pressure fluid means for operating said hammer means, pressure fluid feed means for supplying pressure fluid in the vicinity of the bits of said hammer means, driving means connected to the upper end of said core tube for rotating said core tube about the vertical axis thereof, the said equipment for boring large diameter holes is characterized in that the hammer means are secured to the outer face of the core tube close to the lower end thereof so that the bits project beneath the lower end of the tube, and in that exhaust means are connected to said core tube for collecting the pressure fluid supplied in the vicinity of the bits and the rock cuttings transported by said pressure fluid from the bottom of the hole to the ground surface, whereby the said equipment can bore holes deeper than the average height of hammer means.
- percussive core barrel in the following description, requires less energy than a percussive drill because it only bores out a ring of rock instead of rock over the entire diameter of the hole due to the fact that the hammers are rotated about the vertical axis of the core tube.
- the percussive core barrel will penetrate into the rock at a much faster rate than a rock roller bit or a rock roller core barrel.
- the hammer means are operated by compressed air and the pressure fluid supplied in the vicinity of the hammer bits is the compressed air for operating said hammer means.
- the hammer means are operated by a pressurised liquid and the pressure fluid supplied in the vicinity of the hammer bits is compressed air supplied by pipes extending down to the level of the hammer bits.
- the hammer means are operated by a pressurised liquid and the pressure fluid supplied in the vicinity of the hammer bits is-also the pressurised liquid used to operate the hammer means.
- the percussive core barrel 10 comprises a cylindrical core barrel 12, a plurality of percussive hammers 14 and a drill pipe 16 which extends to the ground surface.
- the core barrel 12 has a vertical axis XX', an upper end 12a, a lower end 12b and a free lower edge 12c.
- the diameter D of the barrel 12 is equal to 1 500 mm in the present example. More generally, this diameter is between 1 and 3 metres.
- the length L of the barrel is equal to 4 metres. More generally, this length is between 3 to 6 metres.
- the machine comprises 8 hammers 14 having a vertical axis and including a body 14a secured to the outer face of the lower end 12b of the barrel and a percussive bit 14b, the bit 14b projecting below the lower edge 12c of the barrel.
- the hammers are regularly angularly disposed around the barrel 12.
- the hammers have a diameter of about 20 cm. These hammers are operated by compressed air at a minimum air pressure of 14 bars. The total volume of air required for the 8 hammers is approximately 155 m 3 /min. As explained hereinafter, the hammers can also be operated by pressurised water or liquid. Additionally, the number of hammers might be different.
- the hammers 14 are located in an annular volume 17 limited by the lower end of the barrel 12, an outer cylindrical shell 18 and an horizontal annular plate 20.
- the compressed air is supplied to the hammers by means of feed pipes 22 which connect the hammers to a compressed air source (not shown) disposed at the ground surface.
- the machine 10 also comprises exhaust pipes 24 which connect the annular volume 17 wherein the hammers are located to a tubular member 26 secured to the upper end of the barrel 12. This tubular member 26 is connected to a frusto conical tubular piece 28 which is secured to the drill pipe 16.
- the machine also comprises a cylindrical spacer ring 30 secured to the barrel 12 and surrounding the upper end 12a of the barrel to act as a guide for the core barrel in the bore.
- a cylindrical spacer ring 30 secured to the barrel 12 and surrounding the upper end 12a of the barrel to act as a guide for the core barrel in the bore.
- the diameter of the outer shell 18 and the spacer ring 30 is slightly less than the diameter of the hole to be bored.
- FIGS 2 and 5 show that the machine is equipped with depth control plates 32. These plates 32 secured to the core barrel extend below the lower edge 12c of the barrel and they are located between the hammer bits 14b. The purpose of these plates is to prevent the bits 14b from penetrating too far into the rock if the hammers 14 are operated without the core barrel being rotated by the drill pipe 16.
- the core barrel 12 is rotated by the drill pipe 16 and the compressed air is supplied to the hammers to operate the bits 14b.
- the bits 14b travel along a circular path around the core tube 12 and the bits 14b bore out a ring of rock, the width thereof corresponds to the size of the bits, leaving a core of rock inside the core tube 12.
- the core of rock When the desired annular bore is obtained, the core of rock may be removed by means of a heavy steel chisel, weighing several tons, which is dropped on to the core of rock to break it into small pieces which can be removed from the hole by a mechanical grab or similar tools. If the depth of the hole required in the rock is more than the internal length L of the barrel 12, boring will be carried out in several stages, the core of rock from each stage being removed before the next stage has begun.
- the compressed air is expelled through the bits 14b and most will return to the ground surface via the exhaust pipes and the drill pipe 16. This air will transport most of the rock cuttings produced by the bits. Some of the air will escape up the outside of the core barrel past the outer shell 18 because the outside diameter of the outer shell is slightly less than the outside diameter of the ring of rock bored out by the bits 14b. However, this will not have a significant detrimental effect on the performance of the percussive core barrel.
- the hammers 14 are operated by compressed air.
- the hammers are operated by hydraulic power and the rock cuttings are still transported by compressed air from the bottom of the hole to the ground surface, therefore a smaller volume of air is required.
- the compressed air feed pipes are detached from the hammers and extended down to the level of the bits, so that air to transport the rock cuttings can be fed down to the bottom of the hole. Most of the air and rock cuttings will return to the ground surface via the exhaust pipes but some will escape up the outside of the core barrel past the outer shell.
- Separate pipes are attached to the hammers 14 to transport the hydraulic fluid used for their operation.
- water is used as hydraulic fluid to operate the hammers and is fed down via the feed pipes to the hammers and expelled through the bits.
- the hole in which the percussive core barrel is being operated is kept full of water to the ground surface by means of a discharge pipe from a suitable water supply.
- Compressed air is fed into the lower part of the machine to cause water and rock cuttings to rise up the exhaust pipes 24 and drill pipe 16 to be discharged at the ground surface.
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- External Artificial Organs (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
- The present invention relates to an equipment for boring large diameter holes into rocks.
- In the present specification, large diameter holes mean holes having a diameter within the range of 1 to 3 metres and a depth within the range of one to 10 metres into the rock. Such holes are to be bored in the rock for foundation piles or other similar purposes.
- The surface of the rock may be at ground level or may be covered by up to 50 metres or more of soil. Where there is soil lying over the rock, a hole will be bored down to the rock by some other means, and held open by a steel casing or support fluid, or a combination of both. Then a specific equipment is used to drill the rock itself.
- Several methods of boring large diameter holes into rock are in common use at the present time :
- Boring with a rock roller bit with the rollers arranged in such a way as to bore out the rock over the entire diameter of the hole as disclosed for instance in DE2602550.
- A rock roller bit requires considerable downward force to be applied to the rollers to penetrate into the rock. The bit is normally attached to a drill pipe which is rotated by a machine at the ground surface. Vertical force is applied to the bit either by hydraulic rams pressing down on the drill pipe or by heavy collars attached to the drill pipe on top of the bit. The rollers are equipped with teeth or hemispherical buttons which crush the rock as they pass over its surface. Discs are also used for this purpose in very strong rock.
- Boring with a percussive drill, having a single large bit as disclosed in DE 3915 538 for instance in such a way as to bore out the rock over the entire diameter of the hole.
- A percussive drill penetrates into the rock at a much faster rate than a rock roller bit or a rock roller core barrel. It is normally operated by compressed air which drives a single large hammer and bit or a number of smaller hammers and bits arranged together in a cluster. The drill is normally attached to a drill pipe which is rotated by a machine at the ground surface and is also used to convey the compressed air to the hammer or hammers. The energy required to operate a percussive drill is much higher than for a rock roller bit or rock roller core barrel, but is needed over a much shorter period.
- Boring augers, toothed core barrels, digging buckets, cleaning buckets and chisels are used mainly for boring holes in weak rocks where acceptable progress can be made with this type of equipment. These tools, with the exception of the chisel, are normally attached to the Kelly bar of a piling rig. Chisels are raised and dropped in the hole either by a separate service crane or by the piling rig itself which may have hoisting facilities for this purpose.
- Boring with a percussive cutting tools secured on a top plate which closes off a ring shaped housing and arranged in such a way as to bore out a ring of rock, leaving a core of rock in the centre to be removed later by some other means as disclosed in US 4526242 and DE 388463. Nonetheless, as the cutting tools are secured on a plate closing off the drill hole, the core of rock cannot penetrate deeper than the height of cutting tools.
- The present invention relates to a drilling equipment which allows the cutting of an annular ring in the rock.
- The object of the present invention is to provide a drilling equipment for boring large diameter holes into rock which combines the high speed of percussive drilling with the economy of boring out only a ring of rock around the perimeter of the hole instead of boring out the rock over its full diameter.
- To achieve this object, according to the present invention, the equipment for boring large diameter holes into the rock comprises :
- a cylindrical core tube having a vertical axis, an upper end and a lower end.
-
- A plurality of hammer means provided with percussive bits (14b) for penetrating into the rock, each hammer means having a vertical axis and,
pressure fluid means for operating said hammer means,
pressure fluid feed means for supplying pressure fluid in the vicinity of the bits of said hammer means,
driving means connected to the upper end of said core tube for rotating said core tube about the vertical axis thereof,
the said equipment for boring large diameter holes is characterized in that the hammer means are secured to the outer face of the core tube close to the lower end thereof so that the bits project beneath the lower end of the tube, and in that exhaust means are connected to said core tube for collecting the pressure fluid supplied in the vicinity of the bits and the rock cuttings transported by said pressure fluid from the bottom of the hole to the ground surface,
whereby the said equipment can bore holes deeper than the average height of hammer means. - It will be understood that the drilling equipment which will be called a "percussive core barrel" in the following description, requires less energy than a percussive drill because it only bores out a ring of rock instead of rock over the entire diameter of the hole due to the fact that the hammers are rotated about the vertical axis of the core tube.
- Moreover, the percussive core barrel will penetrate into the rock at a much faster rate than a rock roller bit or a rock roller core barrel.
- Finally, little downward force has to be applied to the percussive core barrel compared to a rock roller bit or rock roller core barrel, enabling a lighter or less powerful machine to be used at the ground surface to supply the downward force.
- According to a first embodiment, the hammer means are operated by compressed air and the pressure fluid supplied in the vicinity of the hammer bits is the compressed air for operating said hammer means.
- According to a second embodiment, the hammer means are operated by a pressurised liquid and the pressure fluid supplied in the vicinity of the hammer bits is compressed air supplied by pipes extending down to the level of the hammer bits.
- According to a third embodiment, the hammer means are operated by a pressurised liquid and the pressure fluid supplied in the vicinity of the hammer bits is-also the pressurised liquid used to operate the hammer means.
- Other features and advantages of the present invention appear better on reading the following description of several embodiments of the invention given by way of examples.
- The description refers to the accompanying figures in which :
- - Figure 1 is a vertical section of the percussive core barrel on line I-I of figure 4 ;
- - Figure 2 is a vertical section view of the machine on line II-II of figure 4 ;
- - Figure 3 is a vertical section view of the machine on line III-III of figure 4 ;
- - Figure 4 is an horizontal section view of the machine on line IV-IV of figure 1 ;
- Figure 5 is an horizontal section view of the machine on line V-V of figure 1 ;
- Figure 6 is an horizontal section view of the machine on line VI-VI of figure 1 ;
- Figure 7 is an horizontal section view of the machine on line VII-VII of figure 1 ; and
- - Figure 8 is an horizontal section view of the machine on line VIII-VIII of figure 1.
-
- Referring to the drawings, it will be seen that the
percussive core barrel 10 comprises acylindrical core barrel 12, a plurality ofpercussive hammers 14 and adrill pipe 16 which extends to the ground surface. - The
core barrel 12 has a vertical axis XX', anupper end 12a, alower end 12b and a freelower edge 12c. The diameter D of thebarrel 12 is equal to 1 500 mm in the present example. More generally, this diameter is between 1 and 3 metres. The length L of the barrel is equal to 4 metres. More generally, this length is between 3 to 6 metres. - In the particular example, the machine comprises 8
hammers 14 having a vertical axis and including abody 14a secured to the outer face of thelower end 12b of the barrel and a percussive bit 14b, the bit 14b projecting below thelower edge 12c of the barrel. As better shown in figure 5, the hammers are regularly angularly disposed around thebarrel 12. - In this example, the hammers have a diameter of about 20 cm. These hammers are operated by compressed air at a minimum air pressure of 14 bars. The total volume of air required for the 8 hammers is approximately 155 m3/min. As explained hereinafter, the hammers can also be operated by pressurised water or liquid. Additionally, the number of hammers might be different.
- The
hammers 14 are located in anannular volume 17 limited by the lower end of thebarrel 12, an outercylindrical shell 18 and an horizontalannular plate 20. The compressed air is supplied to the hammers by means offeed pipes 22 which connect the hammers to a compressed air source (not shown) disposed at the ground surface. - The
machine 10 also comprisesexhaust pipes 24 which connect theannular volume 17 wherein the hammers are located to atubular member 26 secured to the upper end of thebarrel 12. Thistubular member 26 is connected to a frusto conicaltubular piece 28 which is secured to thedrill pipe 16. - As better shown in figure 2, the machine also comprises a
cylindrical spacer ring 30 secured to thebarrel 12 and surrounding theupper end 12a of the barrel to act as a guide for the core barrel in the bore. Of course, the diameter of theouter shell 18 and thespacer ring 30 is slightly less than the diameter of the hole to be bored. - Figures 2 and 5 show that the machine is equipped with
depth control plates 32. Theseplates 32 secured to the core barrel extend below thelower edge 12c of the barrel and they are located between the hammer bits 14b. The purpose of these plates is to prevent the bits 14b from penetrating too far into the rock if thehammers 14 are operated without the core barrel being rotated by thedrill pipe 16. - The operation of this first embodiment of the
percussive core barrel 10 will be now described in detail. - The
core barrel 12 is rotated by thedrill pipe 16 and the compressed air is supplied to the hammers to operate the bits 14b. - As a result, the bits 14b travel along a circular path around the
core tube 12 and the bits 14b bore out a ring of rock, the width thereof corresponds to the size of the bits, leaving a core of rock inside thecore tube 12. - When the desired annular bore is obtained, the core of rock may be removed by means of a heavy steel chisel, weighing several tons, which is dropped on to the core of rock to break it into small pieces which can be removed from the hole by a mechanical grab or similar tools. If the depth of the hole required in the rock is more than the internal length L of the
barrel 12, boring will be carried out in several stages, the core of rock from each stage being removed before the next stage has begun. - The compressed air is expelled through the bits 14b and most will return to the ground surface via the exhaust pipes and the
drill pipe 16. This air will transport most of the rock cuttings produced by the bits. Some of the air will escape up the outside of the core barrel past theouter shell 18 because the outside diameter of the outer shell is slightly less than the outside diameter of the ring of rock bored out by the bits 14b. However, this will not have a significant detrimental effect on the performance of the percussive core barrel. - In the first embodiment above described, the
hammers 14 are operated by compressed air. - According to a second embodiment, the hammers are operated by hydraulic power and the rock cuttings are still transported by compressed air from the bottom of the hole to the ground surface, therefore a smaller volume of air is required.
- The compressed air feed pipes are detached from the hammers and extended down to the level of the bits, so that air to transport the rock cuttings can be fed down to the bottom of the hole. Most of the air and rock cuttings will return to the ground surface via the exhaust pipes but some will escape up the outside of the core barrel past the outer shell. Separate pipes (not shown in the figures) are attached to the
hammers 14 to transport the hydraulic fluid used for their operation. - According to a third embodiment of the percussive core barrel, water is used as hydraulic fluid to operate the hammers and is fed down via the feed pipes to the hammers and expelled through the bits. The hole in which the percussive core barrel is being operated is kept full of water to the ground surface by means of a discharge pipe from a suitable water supply. Compressed air is fed into the lower part of the machine to cause water and rock cuttings to rise up the
exhaust pipes 24 anddrill pipe 16 to be discharged at the ground surface.
Claims (14)
- An equipment for boring large diameter holes into rocks comprising :a cylindrical core tube (12) having a vertical axis, an upper end and a lower end.A plurality of hammer means (14) provided with percussive bits (14b) for penetrating into the rock, each hammer means (14) having a vertical axis and,pressure fluid means (22) for operating said hammer means (14),pressure fluid feed means for supplying pressure fluid in the vicinity of the bits (14b) of said hammer means (14),driving means connected to the upper end of said core tube (12) for rotating said core tube (12) about the vertical axis thereof,
whereby the said equipment can bore holes deeper than the average height of hammer means (14). - An equipment according to claim 1 further comprising a cylindrical outer shell (18) secured to the core tube (12) and surrounding the lower end thereof, said hammer means (14) being located between said core tube (12) and said outer shell (18).
- An equipment according to claim 2, wherein said exhaust means comprises a plurality of exhaust pipes (24) having lower ends, said lower ends opening into the upper portion of the annular volume limited by the core tube (12) and the outer shell (18).
- An equipment according to claim 3 wherein said driving means (16) for rotating said core tube (12) comprises a vertical drill pipe (16) secured to the upper end of the core tube (12) and extending to the ground surface.
- A surface equipment according to claim 4 wherein said exhaust means further comprises said vertical drill pipe (16).
- An equipment according to anyone of claims 1 to 5 further comprising a cylindrical spacer ring secured to the outside face of said core tube (12) and surrounding the upper end thereof.
- An equipment according to anyone of claims 1 to 6 further comprising a plurality of depth control means, said depth control means being secured to the core tube (12) and projecting out of the lower edge of said core tube (12), said depth control means being located between said hammer means (14).
- An equipment according to anyone of claims 1 to 7 wherein the number of hammer means (14) is equal to 4 to 12.
- An equipment according to anyone of claims 1 to 8 wherein the diameter of the core tube (12) is substantially equal to 1 500 mm.
- An equipment according to anyone of claims 1 to 9 wherein the length of core tube (12) is substantially equal to 4 metres.
- An equipment according to anyone of claims 1 to 10 wherein the hammer means (14) are operated by compressed air and the pressure fluid supplied in the vicinity of the hammer bits (14b) is the compressed air for operating said hammer means (14).
- An equipment according to anyone of claims 1 to 10 wherein the hammer means (14) are operated by a pressurised liquid and the pressure fluid supplied in the vicinity of the hammer bits (14b) is compressed air supplied by pipes extending down to the level of the hammer bits (14b).
- An equipment according to anyone of claims 1 to 10 wherein the hammer means (14) are operated by a pressurised liquid and the pressure fluid supplied in the vicinity of the hammer bits (14b) is also the pressurised liquid used to operate the hammer means (14).
- An equipment according to anyone of claims 1 to 13 wherein the length L of the core tube (12) is strictly superior to the average height of hammer means (14).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9821048 | 1998-09-28 | ||
GBGB9821048.7A GB9821048D0 (en) | 1998-09-28 | 1998-09-28 | Percussive core barrel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0990765A1 EP0990765A1 (en) | 2000-04-05 |
EP0990765B1 true EP0990765B1 (en) | 2004-04-21 |
Family
ID=10839571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99400428A Expired - Lifetime EP0990765B1 (en) | 1998-09-28 | 1999-02-23 | Percussive core barrel |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0990765B1 (en) |
AT (1) | ATE264988T1 (en) |
DE (1) | DE69916546D1 (en) |
GB (1) | GB9821048D0 (en) |
HK (1) | HK1026933A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2350609T3 (en) * | 2007-10-15 | 2011-01-25 | Terrasond Ag | DRILLING AND PROCEDURE DEVICE FOR THE EXTRACTION OF SOIL SAMPLES. |
KR100980895B1 (en) * | 2008-04-15 | 2010-09-10 | 문대영 | Non-vibration excavating method and apparatus |
RU2553697C2 (en) * | 2011-02-11 | 2015-06-20 | Топ Марк Меканикал Эквипмент Лимитед | Drill to make circular wells |
HK1155608A2 (en) * | 2012-02-10 | 2012-05-18 | Top Mark Mechanical Equipment Ltd | Method and apparatus for controlling the operation of cluster drill of down-the-hole hammers |
CA3140181A1 (en) * | 2019-06-04 | 2020-06-04 | Paul Reed | Drilling arrangements |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE388463C (en) * | 1924-01-14 | Koenig Wilhelm | Device for drilling openings, weather overheating and the like. like | |
US3297099A (en) * | 1964-05-28 | 1967-01-10 | Ingersoll Rand Co | Rock drill reamer |
DE2602550A1 (en) * | 1976-01-23 | 1977-07-28 | Preussag Ag | Large diameter well drill rig - with cluster of pneumatic hammers and air lift cuttings removal |
DE3114612C2 (en) * | 1981-04-07 | 1983-11-10 | Hochstrasser, Jürgen, 6600 Saarbrücken | Drilling jig for hard rock |
GB2181473B (en) * | 1985-10-04 | 1989-02-01 | Tone Boring Co | Air pressure impact drilling apparatus |
DE3915538A1 (en) * | 1989-05-12 | 1990-11-15 | Hartfuss Michael | Rotary hard-rock drill - has eccentrically-mounted hammer in housing with milling teeth on bottom edge |
FR2745031B1 (en) * | 1996-02-16 | 2000-01-07 | Boniface Andre | ROTO-PERCUSSION TOOL FOR BORING WELLS OF LARGE DIAMETERS IN VERY HARD TERRAIN |
-
1998
- 1998-09-28 GB GBGB9821048.7A patent/GB9821048D0/en not_active Ceased
-
1999
- 1999-02-23 EP EP99400428A patent/EP0990765B1/en not_active Expired - Lifetime
- 1999-02-23 AT AT99400428T patent/ATE264988T1/en not_active IP Right Cessation
- 1999-02-23 DE DE69916546T patent/DE69916546D1/en not_active Expired - Lifetime
-
2000
- 2000-09-26 HK HK00106090A patent/HK1026933A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0990765A1 (en) | 2000-04-05 |
HK1026933A1 (en) | 2000-12-29 |
DE69916546D1 (en) | 2004-05-27 |
GB9821048D0 (en) | 1998-11-18 |
ATE264988T1 (en) | 2004-05-15 |
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