• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A system for drilling a hole in an earth pipe, characterized in that the system comprises an earth pipe (1); a drill pipe arranged inside the ground pipe (1), which drill pipe comprises a flow channel for compressed air; a pneumatic hammer, and a pilot crown (2) for drilling a hole in the ground pipe (1), the pilot crown (2) comprising at least one flushing channel (4), at least one outlet channel (5) and a central hole (3), the central hole (3) being adapted to direct the exhaust air (A) from the impact hammer to at least one purge channel (4) and at least one exhaust channel (5), in which system the area ratio of the at least one purge and exhaust channel (4, 5) is S and is adapted to be calculated by the formula: S = / Apoisto, where the flush is the cross-sectional area of the at least one flush channel (4) and the Apoisto is the cross-sectional area of the at least one outlet channel (5); and the exhaust air (A) directed to the at least one flushing channel (4) is adapted to move the material at the bottom of the borehole and the exhaust air (A) directed to the at least one flushing channel (5) is adapted to cause a vacuum on the drilling surface (6) of the pilot crown (2). the area ratio S of the outlet channel (4, 5) is 0.02 <S <0.15. In addition, protection requirements 2-5.
    公开号:FI13025Y1
    申请号:FIU20214036U
    申请日:2021-03-16
    公开日:2021-09-24
    发明作者:Sami Eskelin；Jussi Sammatti
    申请人:Mincon Nordic Oy；
    IPC主号:
    专利说明:

    BACKGROUND OF THE INVENTION The invention relates to a system for installing an earth pipe.
    Precussive drilling is an effective way to install an earth pipe or pile on hard ground, e.g. when driving the earth pipe partially into rock. In this case, there are drill pipes inside the ground pipe and an impact hammer at the end of the drill pipe, which is, for example, a DTH (down-the-hole-hammer) hammer. The drill pipe has a central hole through which the compressed air it needs is led to the DTH hammer. The drill pipe, the DTH hammer, the pilot crown and the connecting crown connected to it are rotated simultaneously by a rotation mechanism at the upper end of the drill pipe.
    The drilling of the hole takes place by means of the impact function produced by the hammer and the rotation of the drill pipe. The purpose of the crown is to widen the hole made by the pilot crown so that the ground pipe fits into the drilled hole. The ground pipe may also have a so-called ground shoe, by means of which the pilot crown pulls the ground pipe with it into the drilled hole. The removed material is removed by means of the exhaust air of the DTH hammer. In this case, the exhaust air of the DTH hammer is led to the bottom of the hole to be drilled by means of bores in the pilot crown, from which the air flow carrying the detached material is directed inside the ground pipe and further from the ground pipe to the ground.
    The problem here is that typically part of the airflow escapes into the soil, however. Excessive air escape can significantly reduce the load-bearing capacity of the surrounding soil and thus pose a danger to existing structures in the environment, such as house foundations.
    Without escaping into the soil, the pilot crown can be partially controlled. In particular, a crown in which the purge air blowing to the bottom N of the hole is turned parallel to the bottom of the hole before it discharges from the crown reduces the air escape to the soil.
    S In one embodiment, the exhaust air of the hammer as a whole 2 is directed directly into the ground pipe without blowing purge air into the bottom of the hole. With this solution, of course, the air cannot escape into the soil, but also the detached material cannot be removed from the bottom of the hole.
    0 S
    S> ”
    Brief description of the invention The object of the invention is to provide a new type of system. The object of the invention is achieved by a system which is characterized by what is stated in the independent protection claims. Some preferred embodiments of the invention are the subject of dependent claims.
    The invention is based on a new idea in which a system has been developed which prevents air from escaping into the soil, while at the same time effectively removing the detached material from the bottom of the hole.
    The invention comprises a system for drilling a hole in a ground pipe, wherein the pilot crown comprises at least one flushing duct, at least one exhaust duct and a central hole leading to at least one flushing duct and at least one exhaust duct from the impact hammer. In the system, the exhaust air supplied to the at least one exhaust duct causes a vacuum in the drilling surface of the pilot crown and the exhaust air supplied to the at least one flushing duct moves the material at the bottom of the borehole. The amount of exhaust air supplied to the purge and exhaust duct is determined by the area ratio S of the purge and exhaust duct.
    An advantage of the system according to the invention is that the exhaust air supplied to the at least one flushing channel leads to the bottom of the exhaust air borehole, whereby the material detached during drilling can be effectively moved. In addition, the exhaust air supplied to the at least one exhaust duct causes a vacuum on the drilling surface of the pilot crown, which effectively directs the exhaust air from the at least one exhaust duct and the detached material out of the space between the ground pipe and the drilling rig. The vacuum also effectively prevents air from escaping into the soil, reducing soil damage.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail in connection with preferred embodiments, with reference to the accompanying drawing, in which: Figure 1 schematically shows a side view of a ground pipe drilling system.
    DETAILED DESCRIPTION OF THE INVENTION Figure 1 schematically shows a side view and open section of a system for drilling an earth pipe. The system comprises N ground pipes 1, which are generally installed in the ground permanently. The diameter of the ground pipe 1 may preferably be less than 200 mm. During the installation phase of the ground pipe 1,
    drilling a drill pipe that is rotated inside the ground pipe.
    The system further comprises a pneumatic hammer.
    For the impact hammer, the drill pipe comprises a flow channel for compressed air.
    According to one embodiment, the impact hammer is a pneumatic DTH hammer.
    The impact hammer may also be a non-DTH hammer.
    The percussion hammer may comprise a pneumatic percussion piston fitted reciprocally to the percussion hinge cylinder.
    Figure 1 does not show a drill pipe or a hammer for clarity.
    The system further comprises a pilot crown 2 for drilling a hole in the ground for the ground pipe 1.
    In the embodiment shown in the figure, the pilot crown comprises a drill bit 7 which widens the hole made by the pilot crown 2 so large that the ground pipe 1 fits into the drilled hole.
    According to one embodiment, the pilot crown 2 may comprise a reamer crown 7 or a wing guard, by means of which the pilot crown 2 pulls the ground pipe 1 with it into the drilled hole.
    It can be seen from Figure 1 that the pilot crown 2 comprises at least one flushing duct 4, at least one outlet duct 5 and a central hole 3, which central hole 3 is adapted to conduct exhaust air A from the impact hammer to at least one flushing duct 4 and at least one exhaust duct 5. A is led through the central hole 3 of the pilot crown 2 partly towards the drilling surface 6 at the front of the pilot crown 2 by means of at least one flushing channel 4 and partly towards the side of the pilot crown 2 by means of at least one outlet channel 5.
    There are preferably several discharge channels 5.
    At least one outlet channel 5 can be formed in the pilot crown 2 with an oblique hole at the rear, the outlet of at least one hole being on the sides of the pilot crown 2.
    According to one embodiment, at least one exhaust duct 5 is in flow communication with the space between the pilot crown 2 and the ground pipe 1 and is arranged to direct at least a part of the exhaust air A out of the ground pipe 1. There may be one or more flushing ducts 4.
    At least one flushing channel 4 can lead the exhaust air A directly to the bottom of the N borehole.
    If necessary, the exhaust air A can be led through at least one flushing channel 4 directly to the bottom of the borehole and / or obliquely towards the drilling surface 6 ©.
    A 30 Only a very small proportion of the exhaust air A from the impact hammer is led to the bottom of the borehole E by means of at least one flushing channel 4.
    Most of the exhaust air is directed through a hole (Venturi-S hole) formed by at least one exhaust duct 5 to the space between the ground pipe 1 and the pilot crown 2.
    In this case, a vacuum is created below the hole formed by one or more N discharge channels 5, which is called the Venturi phenomenon.
    In this way, at least one outlet channel 5 causes
    a strong vacuum is applied to the drilling surface 6 at the front of the pilot crown 2. However, the vacuum itself does not cause the drilled soil formed at the bottom of the pilot crown 2 to move, so that an air flow is required to move the soil and other material. For this purpose, exhaust air A is supplied to the bottom of the borehole via at least one hole formed by the flushing channel 4. However, the exhaust air A is supplied to the bottom of the borehole only slightly and from such a small hole that the pressure at the bottom of the borehole does not substantially increase and causes air to escape into the soil, but so much that the air flow . Sufficient vacuum and flow formation at the bottom of the borehole is ensured by selecting the cross-sectional area S of the at least one flushing channel 4 and the cross-sectional area ratio S of the at least one outlet channel 5 appropriately. S can be calculated by the formula S = Rinse / Drain, WHERE Drain is the cross-sectional area of at least one rinsing channel 4 and Drain is the cross-sectional area of at least one outlet duct 5.
    The exhaust air A directed to the at least one flushing channel 4 moves the material at the bottom of the borehole and the exhaust air A conducted to the at least one discharge channel 5 causes a vacuum on the drilling surface 6 of the pilot crown 2 when the flushing and discharge channel area ratio S is 0.02 <S <0.15. According to one embodiment, the area ratio S may preferably be 0.02 <S <0.10 and more preferably 0.05 <S <0.10.
    In one exemplary embodiment, a hole in the ground tube is drilled by the system. The system shown in Figure 1 can be used as the system. The system comprises a ground pipe 1 and a drill pipe inside the ground pipe 1. The drill pipe comprises a flow channel for compressed air and a pneumatic hammer. The system further comprises a pilot crown 2 for drilling a hole in the ground pipe 1, which pilot crown 2 comprises at least one flushing duct 4, at least one outlet duct 5 and a central hole 3. The central hole may lead the exhaust air NA from the hammer wherein in the N example, the area ratio of the at least one flush and outlet ducts 4, 5 is S and 2 it is calculated by the formula S = Flush / Drain, WHERE - E area. In addition, in the example, the exhaust air A introduced into the at least one flushing channel 4 moves the material at the bottom of the boreholes and the exhaust air A conducted to the at least one discharge channel S causes a vacuum N on the drilling surface 6 of the pilot crown 2 when the flushing and discharge channel area ratio S is 0.02 <S <0.15.
    N> ”
    With the solution according to the invention, the material detached to the bottom of the borehole can be effectively removed from the bottom of the hole, while at the same time preventing air from escaping into the soil. In some cases, the features set forth in this application may be used as such, notwithstanding other features. On the other hand, the features presented in this application can be combined, if necessary, to form different combinations. It will be apparent to one skilled in the art that as technology advances, the basic idea of the invention can be implemented in many different ways. The invention and its embodiments - are thus not limited to the examples described above, but may vary within the scope of the protection requirements. OF O
    N 0
    I ©
    I a a © ™
    O + OF O
    N> ”
    权利要求:
    Claims (5)
    [1]
    A system for drilling a hole in an earth pipe, characterized in that the system comprises an earth pipe (1); a drill pipe arranged inside the ground pipe (1), the drill pipe comprising a flow channel for compressed air; a pneumatic hammer, and a pilot crown (2) for drilling a hole in the ground pipe (1), the pilot crown (2) comprising at least one flushing channel (4), at least one outlet channel (5) and a central hole (3), the central hole (3) being adapted to direct the exhaust air (A) from the impact hammer to at least one purge duct (4) and at least one exhaust duct (5), in which system the area ratio of the at least one purge and exhaust duct (4, 5) is S and is adapted to be calculated by the formula : S = Rinse / Drain, where Drain is the cross-sectional area of at least one flush channel (4) and Drain is the cross-sectional area of at least one outlet channel (5); and the exhaust air (A) directed to the at least one flushing channel (4) is adapted to move the material at the bottom of the borehole and the exhaust air (A) directed to the at least one discharge channel (5) is adapted to cause a vacuum on the drilling surface (6) of the pilot crown (2), when the area ratio S of the flushing and discharge channel (4, 5) is 0.02 <S <0.15.
    [2]
    System according to Claim 1, characterized in that the diameter of the ground pipe (1) is less than 200 mm. O
    [3]
    System according to protection claim 1 or 2, characterized in that at least one flushing channel (4) is arranged to direct the exhaust air (A) directly to the bottom of the borehole.
    E
    [4]
    System according to one of the preceding claims, characterized in that the at least one exhaust duct (5) is in flow communication with the space between the pilot crown (2) and the ground pipe (1) and is adapted to lead the exhaust air (A) out of the N ground pipe ( 1). S 35
    [5]
    System according to one of the preceding claims, characterized in that the pilot crown (2) comprises a crown (7) or wing guards.
    OF
    O
    N 0
    I
    O
    I a a
    O
    O
    O +
    OF
    O
    N> ”
    类似技术:
    公开号 | 公开日 | 专利标题
    FI123636B|2013-08-30|A method for controlling the operation of a rock drilling machine and a rock drilling machine
    KR101335411B1|2013-12-02|A percussion hammer for enlarging drilled holes
    NO20083419L|2008-08-05|Method for determining formation fluid entry into or drilling fluid loss from a borehole using a dynamic annular pressure control system
    WO2004046505A3|2004-08-12|Bottomhole assembly
    AU2008353952B2|2011-11-24|Drilling unit, method for slot drilling and slotting device
    JP5629271B2|2014-11-19|Method and apparatus for down-the-hole drilling
    KR20060107247A|2006-10-13|Reaming device with reverse circulation air-hammer and rock drilling method using the same
    KR20100116073A|2010-10-29|Drilling system
    FI13025Y1|2021-09-24|System for installing a ground pipe
    KR101535642B1|2015-07-09|Reverse circulation drilling apparatus
    KR20160034038A|2016-03-29|Reverse circulation drilling apparatus having a casing
    KR200387965Y1|2005-06-28|Reaming device with reverse circulation air-hammer
    US9045945B2|2015-06-02|Attachment for percussion drill tools
    FI128450B|2020-05-29|Drilling device for installing underground pipes in the ground
    WO2000026576A1|2000-05-11|Method and device in down-the-hole drilling
    JP2021511459A|2021-05-06|Equipment and methods for installing the casing
    KR102080788B1|2020-04-23|Horizontal directional drilling method using water hammer directional drilling assembly
    KR20180122957A|2018-11-14|water hammer directional driling assemgly
    US2871826A|1959-02-03|Hammer rock drill
    AU2002311304B2|2008-04-03|Reverse circulation hammer
    KR101904279B1|2018-10-05|Down the hole hammer operating by mud for drilling ground
    CN113840975A|2021-12-24|Down-the-hole drilling assembly and apparatus
    FI13040Y1|2021-10-22|Drilling device for installing underground pipes in the ground
    SU861527A1|1981-09-07|Method of working borehole shaft
    AU2002311319B2|2008-04-10|Reverse Circulation Downhole Hammer
    同族专利:
    公开号 | 公开日
    FI20205640A1|2021-12-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2021-09-24| FGU| Utility model registered|Ref document number: 13025 Country of ref document: FI Kind code of ref document: U1 |
    优先权:
    申请号 | 申请日 | 专利标题
    FI20205640A|FI20205640A1|2020-06-17|2020-06-17|System and method for installing a ground pipe|
    [返回顶部]