The invention relates to a drilling machine for drilling a hole into the ground, rock or for reaming a pre-drilled hole which drilling device comprises, if required, a bit which drills the central part of the hole and a hammer for it or the mentioned bit is at least partly replaced with an end piece which takes control of the pre-drilled hole whereupon in both cases the drilling device additionally comprises several hammering bits placed in a circular shape and equipped with its own hammer whereupon they drill together a bigger hole which has a larger diameter. The drilling device involves a casing tube which can be pulled out of the hole/pushed into the hole which is formed during drilling. Also essentially in the middle of the drilling device exists a tubular, rotatable drill rod tube.
From the patent publication FI-85302 a drilling device, which has several hammering bits some of which have been placed to drill a hole which has a larger diameter, is already known. Each bit has its own hammer which is detachable. During drilling the casing tube is placed into a ready-made hole when drilling progresses. There are only hammers as a solution and with them bits which are detachable and removable from the hole. Instead, other drilling devices cannot be removed until horizontal drilling has been completed and the drill has come back into the sight and created a tunnel. With the drilling device drilling can be done without a pilot hole and a direction given by it.
Further a drilling device is known from the patent application 20040586 that has bits that drill the outer edge of the hole located in a circular shape and all have their own hammer. Hammers are rotatable in such a way that bits protrude outwards from the centre of the device to a drilling position and accordingly are rotatable into a closed position whereupon drilling equipment can be pulled away from the casing tube. With this solution neither vertical holes nor ending horizontal holes can be drilled into the ground in a realiable way so that the resulting hole could easily be released from the drilling devices when only the casing tube remains in the hole. The attachment of the rotatable drilling devices relies only on one hinge point and thus cannot take hammerings very well and drilling devices turn from the strength of drilling hammerings. Turning drilling devices must also be directed diagonally in relation to the drilling direction during drilling whereupon the location of the attachment point moves even further to the drilling device from a moment producing load line. An essential improvement can be achieved in this situation with the new drilling device according to the invention and characteristic for the invention is the fact that hammers which are placed in a circular shape are each attached to the outer surface of the drill rod tube with the help of hinge attachments essentially in the drilling direction and rotation of the drill rod tube in a first direction turns the drilling devices in the mentioned hinge attachment of the hammers from the drill rod tube to go separate to its side and rotation in another direction turns hammers with their bits towards the drill rod tube so that they can be pulled away from the casing tube with the drill rod tube.
The advantage of the invention is the fact that drilling of the vertical holes, which have a large diameter D over 1 m, is possible in such a way that the casing tube is left in the hole and the drilling devices are pulled up from the hole. Turning of the drilling devices, which drill the outer circle of the hole towards the drill rod tube during upward pulling happens automatically. Correspondingly the mentioned drilling devices stay automatically in the right position when disengaged from the drill rod tube during drilling. The drilling device can also be applied to drilling of diagonal and horizontal holes.
In the following the invention can be explained more detailed by referring to the accompanying drawing in which
The drilling device in
Two joint tap attachments 17, 19 have been attached to the outer surface of the drill rod tube 16 by using drilling machines 3 which drill the outer circle of the hole and which all comprise a hammer placed in the drilling device 3 and a bit 4 attached to its head. The drilling devices 3 are mounted to the joint taps 19 with the help of a collar part 13, 14 which can be divided. Joint tap attachments 17, 19 allow the drilling devices 3 to turn essentially in a drilling direction while moving towards the drill rod tube 16 and away from it. The drilling devices 3 are in the drilling position in
The flange 12 which can be attached fixed to the drill rod tube 16 is presented in the
When drilling is finished, equipment is rotated with the help of the drill rod tube 16 against the drilling direction at the same time when it is being pulled away.
The casing flange 10, which has a gap 21 arranged for the drilling device 3, is presented in the
The purpose of the flushing detergent is to transport drilling waste from the drilling surface to behind the drill rod tube 16 according to the arrows. The flushing air is brought separately to each drilling device 3 via the tubes 15.
In
Number | Date | Country | Kind |
---|---|---|---|
20060749 | Aug 2006 | FI | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/FI2007/000208 | 8/23/2007 | WO | 00 | 2/23/2009 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2008/023089 | 2/28/2008 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
1612338 | Wilson et al. | Dec 1926 | A |
3161243 | Davis | Dec 1964 | A |
3773121 | Ikeda | Nov 1973 | A |
3837413 | Dunn | Sep 1974 | A |
5125768 | Ilomaeki | Jun 1992 | A |
5787999 | Holte | Aug 1998 | A |
Number | Date | Country |
---|---|---|
20040586 | Nov 2005 | FI |
1407698 | Jun 1965 | FR |
2132252 | Jul 1984 | GB |
2002155692 | May 2002 | JP |
WO 9201856 | Feb 1992 | WO |
Number | Date | Country | |
---|---|---|---|
20090188722 A1 | Jul 2009 | US |