EP0126046B1 - A method of rock bolting, and a device, and a roof bolting apparatus - Google Patents
A method of rock bolting, and a device, and a roof bolting apparatus Download PDFInfo
- Publication number
- EP0126046B1 EP0126046B1 EP84850123A EP84850123A EP0126046B1 EP 0126046 B1 EP0126046 B1 EP 0126046B1 EP 84850123 A EP84850123 A EP 84850123A EP 84850123 A EP84850123 A EP 84850123A EP 0126046 B1 EP0126046 B1 EP 0126046B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grout
- borehole
- nozzle
- cylinder
- conduit
- 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
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
Definitions
- This invention relates to a method of rock bolting in which a hole is drilled in the rock, a batch of bulk grout is introduced into the borehole and an anchor rod is forced into the borehole.
- the invention relates also to a device for carrying out the introduction of grout in the borehole and a roof bolting apparatus.
- a roof bolting apparatus which comprises a rock drill, a bolt setting machine, and a loading device for two-component resin cartridges.
- the resin cartridges are blown into the borehole and their contents are mixed by the bolt to a hardening mass.
- cartridges for roof bolting are described which contain a dry cement mortar and a separate compartment of water. It is also known to insert a hose to the bottom of the borehole and to pass a bulk cement grout through the hose while slowly withdrawing the hose. This method can be used with the roof bolting apparatus disclosed in US-A-4351625.
- the rock bolting rig shown on the drawings comprises a wheeled chassis 12 on which a boom 13 is swingably mounted.
- the boom 13 carries pivotably a feed beam 14.
- a slide 15 is mounted on the feed beam 14 and it can be moved along the feed beam by means of a non-illustrated hydraulic feeding device in a conventional way.
- a machine shifting device 16 is mounted on the rear end of the feed beam 14. When the slide 15 is in its rearmost position as shown in Fig. 3, a rock drill 17 which is shown in its operational position on the slide 15 can be moved off the slide 15 to the left in the figure and a bolt setter 29 can replace it on the slide 15. This lateral shifting is effected by means of a hydraulic cylinder 18.
- the bolt setter may include a hydraulic motor so that it can rotate the bolt while forcing it into the borehole.
- a support 19 is mounted to pivot about an axis that is parallel with the feed beam.
- the support 19 carries a guide 20 for a drill steel 21, a nozzle 22, and a guide 23 for a rock bolt 24 of the kind shown in Fig. 5.
- a magazine for rock bolts is indicated in Fig. 2 by reference numeral 43.
- the bolt 24 or anchoring rod comprises a re-bar 53, a washer or plate 54, and a nut 55.
- the drill steel guide 20 By means of a hydraulic cylinder 25, the drill steel guide 20, which is shown in its operational position, can be swung aside and the nozzle 22 and the guide 23 for the rock bolt can be alternatively swung into their operational positions in line with a borehole 26 drilled by the rock drill 17 and its drill steel 21.
- the very front of the feed beam 14 comprises a support pad 27 of hard rubber that is arranged to be forced to take support against the rock.
- a hose 28 couples the nozzle 22 to a cement grout supplying device 30 that is mounted on the chassis 12.
- the cement grout supplying device 30 comprises a frame 31 mounted on the chassis 12.
- the frame 31 includes a plate 32 and guides 33 for guiding a slide or shutter 34 on the plate 32.
- the shutter 34 carries a cement mixer 35 with a conical housing 36 and a rotatable agitator 37 that is driven by a hydraulic motor 38 on a cover 42 of the housing 36.
- the housing 36 forms a mixing chamber which is also a storage chamber.
- the bottom end of the conical housing 36 is coaxial with a hole 39 in the shutter 34.
- the agitator 37 is journalled in a spider 40 mounted in the hole 39.
- the hose 28 is coupled to a hole 41 in the shutter 34.
- a cylinder 45 is suspended in yoke 46 which is suspended in two bolts 47, 48.
- Two short hydraulic jacks 49, 50 are arranged as spacers between the yoke 46 and the nuts 51, 52 on the bolts 47, 48.
- the jacks 49, 50 are coupled to constantly bias the end face of the cylinder 45 against the slide 34 with a force that permits movement of the slide. Then, the jacks 49, 50 can be actuated to clamp the cylinder 45 against the shutter at a considerably larger force to provide for or seal that withstands high pressure.
- the jacks 49,50 instead of using the jacks 49,50 for applying the constantly applied force on the cylinder 45, one can couple springs between the frame 31 and the yoke 46 and use the jacks 49, 50 for the clamping only.
- a piston 60 is slidable in the cylinder 45. It has an annular piston rod 61 that slides on a piston 62. The piston rod 59 of the piston 62 is fixed to the frame 31. An annular chamber 57 under the piston 60 is washed with water supplied through a supply conduit 58.
- a supply passage 63 for hydraulic fluid leads to a cylinder chamber 64 for urging the piston 60 upwardly in a work stroke and a supply passage 65 leads to a cylinder chamber 66 for urging the piston 60 downwardly in a return stroke.
- a hydraulic cylinder 69 is coupled between the frame 31 and the shutter 34 and it is arranged to move the shutter 34 between three fixed positions.
- the cement mixer 35 is coaxial with the cylinder 45.
- the hole 41 is coaxial with the cylinder 45.
- the conical housing 36 of the mixer 35 is open-to a hole 67 in the plate 32.
- a hose 68 leads from the hole 67 to the ground.
- the cement grout is prepared in the mixer 35.
- a grout comprising only a hydraulic cement e.g., portland cement, and water is used, sometimes a cement mortar with fine sand is used.
- the shutter 34 is first moved to its intermediate position in which the hole 41 is coaxial with the cylinder and the plate 32 forms a bottom of the cement mixer 35, and the mixer 35 is filled with dry cement or dry cement mortar and a pre- determined amount of water is added.
- the hydraulic motor 38 is started so that the agitator 37 makes a grout out of the cement and water.
- the shutter 34 is moved to its position in Fig.
- the piston 60 is moved downwardly by hydraulic oil supplied to the chamber 66 through the passage 65.
- the length of the downward return stroke can be adjusted by means of an axially adjustable sensor indicated at 70 so that the effective cylinder volume of the positive displacement pump 45, 60 can be pre- determined and a pre-determined amount of grout be supplied to the cylinder 45.
- the shutter 34 is again moved to the left in Fig. 4 so that it forms a cylinder head provided with an outlet 41.
- the piston 60 is actuated by hydraulic oil supplied to the chamber 64 through the passage 65 to perform an upward work stroke, that is, to force the grout in the cylinder 45 out into the hose 28.
- the pressure in the cylinder 45 can for example be 10 Mpa and the pressure in the nozzle 22 may then be 1 Mpa.
- the jacks 49, 50 are actuated to clamp the cylinder 45 against the shutter 34 at the same time as the cylinder chamber 66 is pressurized so that a good seal is provided between the cylinder 45 and the shutter 34. The operation is repeated until the hose 28 is filled with grout so that grout is ejected from the nozzle when the piston 60 performs a work stroke.
- the feed beam 14 is positioned and forced against the rock, and the rock drill 17 is actuated to drill a hole in the rock.
- the cylinder 45 is filled with grout and the shutter 34 is moved to its intermediate position in which it forms a head of the cylinder 45 as described above.
- the hydraulic cylinder 25 is actuated to position the nozzle 22 in line with the borehole 26.
- the nozzle 22 is then at the mouth of the borehole. It is adjacent the mouth but at a distance from the mouth as can be seen in Fig. 4. It can for example be a few centimeters from the borehole mouth or a few decimeters from it.
- the piston 60 is actuated to force its predetermined volume of grout out into the hose 28 so that a corresponding amount of grout is ejected out of the nozzle 22 as a jet that hits the bottom of the hole.
- the diameter of the nozzle should be smoothly reduced as shown in Fig. 4 in order to provide for a jet and not a spray.
- the outlet diameter of the nozzle should be less than half the diameter of the borehole or less than one third thereof.
- the borehole can have a diameter of 40 mm, the anchor rod a diameter of 30 mm and the nozzle an outlet diameter of 8 mm.
- the amount of grout ejected should not completely fill the hole. It should be calculated to fill the space between the bolt and the borehole when the bolt has been inserted.
- the volume of the batch of grout ejected will usually be about half the volume of the borehole.
- the cylinder 45 and the piston 60 are so designed as to provide a sufficient volume of grout in a borehole in one shot. It is, however, also possible to make them smaller and to shoot more than once.
- the operator adds dry cement and water to the housing 36 when the magazine 43 for bolts is empty. Then, the grout will be ready to use when he has refilled the magazine 43.
- nozzle inside the hole instead of having the nozzle outside the borehole as described, one can have the nozzle inside the hole. It should then not be inserted too far since it must be outside the portion of the hole which is to be filled with grout. Thus, it should be outside the axial midpoint of the borehole.
- One advantage of having the nozzle inside the borehole is that it can be designed to be guided by the borehole and thereby aligned with the borehole. However, having the nozzle in the borehole would complicate the operation. It is easier to move the nozzle laterally only, as illustrated.
- the jet touch the borehole wall before hitting the bottom of the hole.
- the jet fills the borehole from the bottom if its velocity when ejected is higher than about 4 m/s.
- its velocity should be at least 6 m/s and preferably it should be between 8 and 15 m/s.
- the bolt setting machine is actuated to force a bolt into the borehole until the plate of the bolt contacts the rock.
- the nut 55 can be tightened.
- the housing 36 can be cleaned when the shutter 34 is in its left end position in which the housing 36 is open to the drain off hose 68. Then, when the cleaned housing is moved back into its position of Fig. 4, water can be furnished to the housing 36 and the piston 60 can be reciprocated to clean the cylinder 45.
Abstract
Description
- This invention relates to a method of rock bolting in which a hole is drilled in the rock, a batch of bulk grout is introduced into the borehole and an anchor rod is forced into the borehole. The invention relates also to a device for carrying out the introduction of grout in the borehole and a roof bolting apparatus.
- In US-A-4158520, a roof bolting apparatus is shown which comprises a rock drill, a bolt setting machine, and a loading device for two-component resin cartridges. The resin cartridges are blown into the borehole and their contents are mixed by the bolt to a hardening mass. In GB-A-953056, cartridges for roof bolting are described which contain a dry cement mortar and a separate compartment of water. It is also known to insert a hose to the bottom of the borehole and to pass a bulk cement grout through the hose while slowly withdrawing the hose. This method can be used with the roof bolting apparatus disclosed in US-A-4351625.
- Although there are several known methods of anchoring a roof bolt, there is still a need for a method and a device by which a simple and non- expensive roof bolt can be reliably anchored at a low cost. In particular, it is desirable that it be possible to anchor the bolt directly in connection with the drilling of the borehole. This invention as claimed in claims 1 to 11 provides such a method and such a device.
- The invention will be described with reference to the accompanying drawings.
- Fig. 1 is a side view of a mobile rock bolting rig according to the invention.
- Fig. 2 is a top elevational view of the rig shown in Fig. 1.
- Fig. 3 is an enlarged fragmentary view seen as indicated by the arrows 3-3 in Fig. 1.
- Fig. 4 is a side view of some details shown in Figs. 1 and 2.
- Fig. 5 shows a rock bolt that can be set by means of the rig.
- The rock bolting rig shown on the drawings comprises a
wheeled chassis 12 on which aboom 13 is swingably mounted. Theboom 13 carries pivotably afeed beam 14. Aslide 15 is mounted on thefeed beam 14 and it can be moved along the feed beam by means of a non-illustrated hydraulic feeding device in a conventional way. A machine shiftingdevice 16 is mounted on the rear end of thefeed beam 14. When theslide 15 is in its rearmost position as shown in Fig. 3, arock drill 17 which is shown in its operational position on theslide 15 can be moved off theslide 15 to the left in the figure and abolt setter 29 can replace it on theslide 15. This lateral shifting is effected by means of ahydraulic cylinder 18. The bolt setter may include a hydraulic motor so that it can rotate the bolt while forcing it into the borehole. At the front end of thefeed beam 14, asupport 19 is mounted to pivot about an axis that is parallel with the feed beam. Thesupport 19 carries aguide 20 for adrill steel 21, anozzle 22, and aguide 23 for arock bolt 24 of the kind shown in Fig. 5. A magazine for rock bolts is indicated in Fig. 2 by reference numeral 43. Thebolt 24 or anchoring rod comprises are-bar 53, a washer orplate 54, and anut 55. By means of ahydraulic cylinder 25, thedrill steel guide 20, which is shown in its operational position, can be swung aside and thenozzle 22 and theguide 23 for the rock bolt can be alternatively swung into their operational positions in line with aborehole 26 drilled by therock drill 17 and itsdrill steel 21. The very front of thefeed beam 14 comprises asupport pad 27 of hard rubber that is arranged to be forced to take support against the rock. - A
hose 28 couples thenozzle 22 to a cementgrout supplying device 30 that is mounted on thechassis 12. - The cement
grout supplying device 30 comprises aframe 31 mounted on thechassis 12. Theframe 31 includes aplate 32 and guides 33 for guiding a slide orshutter 34 on theplate 32. Theshutter 34 carries acement mixer 35 with aconical housing 36 and arotatable agitator 37 that is driven by ahydraulic motor 38 on a cover 42 of thehousing 36. Thehousing 36 forms a mixing chamber which is also a storage chamber. - The bottom end of the
conical housing 36 is coaxial with a hole 39 in theshutter 34. Theagitator 37 is journalled in aspider 40 mounted in the hole 39. Thehose 28 is coupled to a hole 41 in theshutter 34. - A
cylinder 45 is suspended inyoke 46 which is suspended in twobolts hydraulic jacks yoke 46 and thenuts bolts - The
jacks cylinder 45 against theslide 34 with a force that permits movement of the slide. Then, thejacks cylinder 45 against the shutter at a considerably larger force to provide for or seal that withstands high pressure. Instead of using thejacks cylinder 45, one can couple springs between theframe 31 and theyoke 46 and use thejacks - A
piston 60 is slidable in thecylinder 45. It has anannular piston rod 61 that slides on apiston 62. Thepiston rod 59 of thepiston 62 is fixed to theframe 31. Anannular chamber 57 under thepiston 60 is washed with water supplied through asupply conduit 58. - A
supply passage 63 for hydraulic fluid leads to acylinder chamber 64 for urging thepiston 60 upwardly in a work stroke and asupply passage 65 leads to acylinder chamber 66 for urging thepiston 60 downwardly in a return stroke. - A
hydraulic cylinder 69 is coupled between theframe 31 and theshutter 34 and it is arranged to move theshutter 34 between three fixed positions. In the right end position of theshutter 34 illustrated in Fig. 4, thecement mixer 35 is coaxial with thecylinder 45. In an intermediate position, the hole 41 is coaxial with thecylinder 45. In the left end position of the shutter, theconical housing 36 of themixer 35 is open-to ahole 67 in theplate 32. Ahose 68 leads from thehole 67 to the ground. - A bolt setting operation will now be described.
- Before drilling the first hole in a shift or after a break, the cement grout is prepared in the
mixer 35. Usually a grout comprising only a hydraulic cement e.g., portland cement, and water is used, sometimes a cement mortar with fine sand is used. Theshutter 34 is first moved to its intermediate position in which the hole 41 is coaxial with the cylinder and theplate 32 forms a bottom of thecement mixer 35, and themixer 35 is filled with dry cement or dry cement mortar and a pre- determined amount of water is added. Thehydraulic motor 38 is started so that theagitator 37 makes a grout out of the cement and water. Theshutter 34 is moved to its position in Fig. 4 so that the grout fills thecylinder 45 when, from its uppermost position, thepiston 60 is moved downwardly by hydraulic oil supplied to thechamber 66 through thepassage 65. The length of the downward return stroke can be adjusted by means of an axially adjustable sensor indicated at 70 so that the effective cylinder volume of thepositive displacement pump cylinder 45. Theshutter 34 is again moved to the left in Fig. 4 so that it forms a cylinder head provided with an outlet 41. Then, thepiston 60 is actuated by hydraulic oil supplied to thechamber 64 through thepassage 65 to perform an upward work stroke, that is, to force the grout in thecylinder 45 out into thehose 28. The pressure in thecylinder 45 can for example be 10 Mpa and the pressure in thenozzle 22 may then be 1 Mpa. Thejacks cylinder 45 against theshutter 34 at the same time as thecylinder chamber 66 is pressurized so that a good seal is provided between thecylinder 45 and theshutter 34. The operation is repeated until thehose 28 is filled with grout so that grout is ejected from the nozzle when thepiston 60 performs a work stroke. - The bolting operation-can now start. Thus, the
feed beam 14 is positioned and forced against the rock, and therock drill 17 is actuated to drill a hole in the rock. During the drilling operation, thecylinder 45 is filled with grout and theshutter 34 is moved to its intermediate position in which it forms a head of thecylinder 45 as described above. When the hole has been drilled, thehydraulic cylinder 25 is actuated to position thenozzle 22 in line with theborehole 26. Thenozzle 22 is then at the mouth of the borehole. It is adjacent the mouth but at a distance from the mouth as can be seen in Fig. 4. It can for example be a few centimeters from the borehole mouth or a few decimeters from it. Then thepiston 60 is actuated to force its predetermined volume of grout out into thehose 28 so that a corresponding amount of grout is ejected out of thenozzle 22 as a jet that hits the bottom of the hole. The diameter of the nozzle should be smoothly reduced as shown in Fig. 4 in order to provide for a jet and not a spray. The outlet diameter of the nozzle should be less than half the diameter of the borehole or less than one third thereof. As an example, the borehole can have a diameter of 40 mm, the anchor rod a diameter of 30 mm and the nozzle an outlet diameter of 8 mm. The amount of grout ejected should not completely fill the hole. It should be calculated to fill the space between the bolt and the borehole when the bolt has been inserted. Thus, the volume of the batch of grout ejected will usually be about half the volume of the borehole. Preferably, thecylinder 45 and thepiston 60 are so designed as to provide a sufficient volume of grout in a borehole in one shot. It is, however, also possible to make them smaller and to shoot more than once. Usually, the operator adds dry cement and water to thehousing 36 when the magazine 43 for bolts is empty. Then, the grout will be ready to use when he has refilled the magazine 43. - Instead of having the nozzle outside the borehole as described, one can have the nozzle inside the hole. It should then not be inserted too far since it must be outside the portion of the hole which is to be filled with grout. Thus, it should be outside the axial midpoint of the borehole. One advantage of having the nozzle inside the borehole is that it can be designed to be guided by the borehole and thereby aligned with the borehole. However, having the nozzle in the borehole would complicate the operation. It is easier to move the nozzle laterally only, as illustrated.
- It is usually unavoidable that the jet touch the borehole wall before hitting the bottom of the hole. However, it has been found that the jet fills the borehole from the bottom if its velocity when ejected is higher than about 4 m/s. Thus, its velocity should be at least 6 m/s and preferably it should be between 8 and 15 m/s.
- When the batch of grout has thus been delivered to the borehole, the bolt setting machine is actuated to force a bolt into the borehole until the plate of the bolt contacts the rock. When the grout has set, the
nut 55 can be tightened. - It is a risk that leaking cement will harden on the equipment and make the equipment inoperable. Since a hydraulic cement is used, this problem can be overcome simply by spraying water on vital parts continuously or at short intervals during operation. To this end there are several spray nozzles mounted on the rig. Some vital nozzles are marked out on the drawings. There is a
nozzle 72 for spraying on thesupport 19 and itsguides injection nozzle 22. This spray will also wet the bolts when the bolts are being inserted. Of course, when shooting a jet of grout through thenozzle 22, the spray should be off. Twospray nozzles shutter 34 and a spray nozzle 75 is arranged to spray into thehousing 36 when the cover 42 thereof is opened. When the operation is interrupted for a longer period, thehousing 36 can be cleaned when theshutter 34 is in its left end position in which thehousing 36 is open to the drain offhose 68. Then, when the cleaned housing is moved back into its position of Fig. 4, water can be furnished to thehousing 36 and thepiston 60 can be reciprocated to clean thecylinder 45. - In the above description of the preferred embodiment of the invention, elements that are not vital for the understanding of the invention has not been described in detail. The magazine 43 and its operation for example has not been described in detail. The operation of the
shutter 34, thepiston 60, and thejacks support 19 and the exchange of machines on theslide 15.
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84850123T ATE29761T1 (en) | 1983-04-12 | 1984-04-12 | ANCHOR REMOVAL METHOD, APPARATUS THEREFORE AND ANCHOR REMOVAL DEVICE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8302025 | 1983-04-12 | ||
SE8302025A SE8302025L (en) | 1983-04-12 | 1983-04-12 | VIEW TO ROOFING AND ROOFING |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0126046A1 EP0126046A1 (en) | 1984-11-21 |
EP0126046B1 true EP0126046B1 (en) | 1987-09-16 |
Family
ID=20350766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84850123A Expired EP0126046B1 (en) | 1983-04-12 | 1984-04-12 | A method of rock bolting, and a device, and a roof bolting apparatus |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0126046B1 (en) |
JP (1) | JPS60501164A (en) |
AT (1) | ATE29761T1 (en) |
DE (1) | DE3466268D1 (en) |
FI (1) | FI83991C (en) |
NO (1) | NO844962L (en) |
SE (2) | SE8302025L (en) |
WO (1) | WO1984004131A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPP955399A0 (en) * | 1999-03-31 | 1999-04-29 | Hydramatic Engineering Pty. Ltd. | Method and apparatus for insertion of rockbolts |
FI123637B (en) * | 2006-11-02 | 2013-08-30 | Sandvik Mining & Constr Oy | Cement silo construction for a mining machine |
SE539411C2 (en) | 2014-07-03 | 2017-09-19 | Skanska Sverige Ab | Method and arrangement for mounting bolts in a tunnel wall |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL31276C (en) * | 1930-04-11 | |||
CH455405A (en) * | 1965-05-19 | 1968-07-15 | Tox Duebel Werk | Method for fastening objects to masonry and spray nozzle for carrying out the method |
GB1503904A (en) * | 1973-12-11 | 1978-03-15 | Fosroc International Ltd | Method of anchoring a fixing element |
SE413691B (en) * | 1977-08-31 | 1980-06-16 | Atlas Copco Ab | Rock bolters |
SE413929B (en) * | 1977-09-02 | 1980-06-30 | Trelleborgs Gummifabriks Ab | An injection |
DE2750532A1 (en) * | 1977-11-11 | 1979-05-17 | Fischer Artur Dr H C | Anchoring medium injector for attachments fastened in orificed wall - uses two-component medium initially kept in foil tube with separate chambers |
US4215953A (en) * | 1978-08-30 | 1980-08-05 | Envirotech Corporation | Device for injecting cartridges of resin for bolting apparatus |
DE2838466C2 (en) * | 1978-09-04 | 1984-09-20 | Günther Bernack | Anchor sleeve for fastening in a blind hole in a component by means of an injection compound |
SE417742B (en) * | 1979-02-22 | 1981-04-06 | Linden Alimak Ab | DEVICE FOR BULT DRILLING DEVICE |
JPS55152299A (en) * | 1979-05-16 | 1980-11-27 | Kensetsu Kiso Eng | Construction method with spray type lockup bolt |
DE2925197A1 (en) * | 1979-06-22 | 1981-01-15 | Delecker Willy Max Eduard | Screw securing system in porous wall - sprays fixing agent into hole after dust removal |
JPS5766300A (en) * | 1980-10-02 | 1982-04-22 | Andrews & George Co Inc | Mortar injector for lock bolt construction method |
GB2095308A (en) * | 1981-03-24 | 1982-09-29 | Willich F Gmbh & Co | Method and apparatus for consolidating rock strata |
-
1983
- 1983-04-12 SE SE8302025A patent/SE8302025L/en not_active Application Discontinuation
-
1984
- 1984-04-12 JP JP59501770A patent/JPS60501164A/en active Pending
- 1984-04-12 AT AT84850123T patent/ATE29761T1/en not_active IP Right Cessation
- 1984-04-12 DE DE8484850123T patent/DE3466268D1/en not_active Expired
- 1984-04-12 EP EP84850123A patent/EP0126046B1/en not_active Expired
- 1984-04-12 WO PCT/SE1984/000138 patent/WO1984004131A1/en active IP Right Grant
- 1984-12-06 SE SE8406196A patent/SE451867B/en not_active IP Right Cessation
- 1984-12-11 NO NO844962A patent/NO844962L/en unknown
- 1984-12-11 FI FI844885A patent/FI83991C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE29761T1 (en) | 1987-10-15 |
SE8302025D0 (en) | 1983-04-12 |
FI83991B (en) | 1991-06-14 |
SE8406196L (en) | 1984-12-06 |
SE8406196D0 (en) | 1984-12-06 |
FI83991C (en) | 1991-09-25 |
FI844885A0 (en) | 1984-12-11 |
DE3466268D1 (en) | 1987-10-22 |
JPS60501164A (en) | 1985-07-25 |
FI844885L (en) | 1984-12-11 |
EP0126046A1 (en) | 1984-11-21 |
WO1984004131A1 (en) | 1984-10-25 |
SE451867B (en) | 1987-11-02 |
NO844962L (en) | 1984-12-11 |
SE8302025L (en) | 1984-10-13 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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