• 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:
    Liquid-driven drilling device for drilling boreholes in the ground, which drilling device (100) comprises drill (16), a percussion device (24) which provides a percussion movement to the drill (16), to the percussion device (24) led pressurized flush medium flow and a flow channel (9 ) for directing said flushing medium flow from the percussion device (24) to said drill (16) for flushing, which drill (16) comprises a pilot drill (6) for drilling in the ground (18) arranged to act as the tip (16) of the drill (16) 20), coupling devices (8) releasably arranged around the pilot drill (6) for releasably attaching the ground pipe (1) drawn after the drill (16) to the pilot drill (6), said coupling devices (8) being arranged to be tightly attached to the pilot drill (6). 6) to prevent the flushing medium from entering the ground pipe (1) between the coupling devices (8) and the ground pipe (1), an extension part (7) locked around the pilot drill (6) in the direction of said flow channel (9) after said coupling devices ( 8) in the drill (16) drill direction for increasing the diameter of said borehole (22), a first flushing channel (10) formed in the pilot drill (6) from said flow channel (9), a second flushing channel (12) formed in the pilot drill (6) including a front part (12.1) arranged to extend in the drilling direction to the tip (20) of the pilot drill (6) and a rear part (12.2) extending into the ground pipe (1), said front part (12.1) and rear part (12.2) forming a direct connection through the pilot drill (6). ), where the pilot drill (6) can be detached from the coupling devices (8) for pulling the drill (16) out of the borehole (22) when the ground pipe (1) attached to the pilot drill (6) remains in the borehole (22) and said first flushing channel ( 10) is arranged to be connected directly to the second flushing channel (12), characterized in that said first flushing channel (10) is dimensioned so that 90 - 100% of the flushing medium of the flow channel (9) is led to the second flushing channel (12) and via this in drilling direction to the pilot or forward of the pilot drill back depending on the pressures acting in the front (12.1) and rear (12.2) of the second flushing channel (12) for flushing off drilling debris while avoiding overflowing of the borehole (22). In addition, the protection requirements 2-5.
    公开号:FI13040Y1
    申请号:FIU20214085U
    申请日:2018-04-13
    公开日:2021-10-22
    发明作者:Juhani Välisalo
    申请人:Pirkan Laatupalvelu Oy；
    IPC主号:
    专利说明:

    The invention relates to a liquid-operated drilling rig for drilling a borehole in a soil, the drilling rig comprising an impact device for impinging a blade , - connecting means removably arranged around the pilot blade for releasably securing the ground pipe to be pulled behind the blade, the connecting means being adapted to be tightly attached to the pilot blade in the direction of the formed a flow channel in the pilot blade - a second flushing channel formed in the pilot blade, comprising a front part adapted to extend in the drilling direction to the tip of the pilot blade and a rear part extending into the ground tube, the front and rear parts being in direct contact through the pilot blade, the second flushing channel also includes,> said first flushing channel being adapted to merge directly with the second flushing channel. co.
    Furthermore, when the drilling device becomes clogged in, for example, silty soils, it is not even possible to start the hammer because the pressure medium cannot escape to the exhaust side of the blade pressure medium through the blocked blade flushing channel, so that the required pressure difference
    Liquid-operated submersible hammers are used instead of pneumatic submersible hammers in drilling rigs to avoid overflushing problems.
    A Finnish patent application FI 20130297 is known from the prior art, which discloses a pneumatic drilling rig.
    However, the use of compressed air easily causes the borehole to be overflushed, bringing too much soil out of the borehole.
    In addition, the use of compressed air can be dangerous when flushing drilling debris with high pressure upwards.
    US 2015/0330151 A1, which discloses a liquid-operated drilling rig, is also known from the prior art.
    In this solution, the rinsing liquid, which is led in front of the pilot blade along the flushing channel, is led directly in front of the pilot blade between the reader blade and the ground pipe attached to the pilot blade.
    In the event of a blockage, the flushing waste clogs the channel between this pilot blade and the drill bit, preventing the flow of flushing fluid O 25 along both the above-mentioned channel and the flushing channel s in front of the pilot blade, so that the drill The object of the invention is to provide a better and simpler liquid rinsing drilling device 5 for forming a drilling hole, by means of which the pressure on the soil can be limited when the rinsing channel leading to the drilling device becomes blocked and it is also possible to start the blocked drilling device. The characteristic features of the present invention appear from the appended claim 1.
    The object of the liquid-operated drilling rig according to the invention can be achieved by a drilling rig for drilling a borehole in the ground, the drill The blade includes a pilot blade adapted to drill the soil to act as the tip of the blade and connecting means removably mounted around the pilot blade to releasably attach a ground pipe pulled behind the blade, the connecting means being adapted to be securely attached to the pilot blade. In addition, the blade includes an extension portion locked around the pilot blade in the direction of the flow channel after the connecting means to increase the drill hole diameter, a first flushing channel formed from the pilot blade flow channel and a second flushing channel formed in the drill bit. through a direct connection pilot blade. The first flushing channel s is adapted to coincide directly with the second flushing channel to conduct 90-100% of the flow channel flushing fluid z in the drilling direction to the front or rear of the pilot blade to flush drilling debris so depending on the pressures S 30 at the front and rear, avoiding overflow. The pilot blade is detachable from the connecting means for pulling the blade out of the borehole with the ground pipe attached to the pilot blade remaining in the borehole.
    With the% drilling rig according to the invention, the pressure on the ground can be limited both in the drilling direction of the pilot blade by means of a second flushing channel extending to the front and rear, without, however, limiting the pressure used by the impactor. The flushing fluid can be fed to the blade at full pressure along the flow channel at all times, as when the pressure rises outside the pilot blade or at the front of the second flushing channel, the flushing fluid can be directed through the back of the second flushing channel without increasing the ground pressure. In other words, the flushing liquid discharged from the first flushing channel to the second flushing channel is free to choose its discharge channel according to the prevailing pressure level where the lower pressure acts. With the correct dimensioning, the pressure inside the earth pipe is always such that the rinsing liquid can be discharged there before the soil is overflushed. According to one embodiment, the first flushing channel is connected to the second flushing channel at right angles. Due to the directional angle of the first flushing channel and the second flushing channel, the flushing fluid can equally select either the front of the second flushing channel or the rear part according to the pressure level in them without confusing the flow dynamics. S 25
    N s According to another embodiment, the drilling device comprises e at least two first flushing channels, at least one of which z is adapted to coincide with the flow channel at an angle of 30-60 ° to the flushing liquid in the flow channel and S 30 at least one is adapted to coincide with the flow channel at 120-150 ° in the flow direction of the flushing fluid in the flow channel S. In such a drill, the flushing fluid flowing in the flow passage can flow more smoothly into the first flushing channel parallel to the flow direction and thereby into the front of the second flushing channel and the first flushing channel opposite the flushing fluid flow direction to the rear of the second flushing channel.
    This keeps the flushing fluid flow rate higher, which prevents jamming of the sand and debris entering the ground pipe.
    In this way, the flow resistance caused by the sand in the ground pipe can be reduced when the sand cannot pack at the bottom of the ground pipe.
    Preferably, only the second flushing channel extends in the drilling direction to the tip of the pilot blade.
    In this case, the entire rinsing liquid can be directed to transport the drilling waste.
    Preferably, the second flushing channel is equal in diameter for both the front and rear.
    Such a structure is easy to manufacture and prevents differences between the front and rear due to flow dynamics.
    Alternatively, the pilot blade further includes a purge passage for directing a partial flow of rinsing fluid in the drilling direction to keep the pilot blade clean, said fourth rinsing passage being sized so that the partial flow is no more than 10% of the total rinsing fluid flow in the flow passage.
    With such a separate cleaning channel, the pilot blade can be kept clean to prevent it from clogging. 3 e The cross-sectional area of the cleaning channel may be 1 to 10% z of the cross-sectional area of the first flushing channel. In this case, the volume flow S 30 of the rinsing liquid entering the cleaning channel is small enough so that it cannot over-expand the N borehole but only cleans the pilot blade to prevent it from jamming.
    Preferably, the connecting means is a ground shoe. By means of the ground shoe, the ground pipe can be connected to the drill part so that the drill part can be detached from the ground shoe at the end of the drilling to pull the drill part out of the borehole.
    Preferably, the impact device includes a supply connection for sucking the rinsing fluid from inside the ground tube, and the impact device is adapted to use the rinsing fluid of the ground tube bore to provide an impact movement. In this case, in addition to limiting the pressure, in the event of a blockage in the front of the second flushing channel, the drilling device is started when the flushing liquid is led into the ground pipe along the rear of the second flushing channel
    The diameter of the pilot blade of the drilling rig according to the invention may be 5 to 100 cm, preferably 10 to 50 cm. In this case, the drilling rig is large enough for the installation of the ground pipes of the drill piles.
    The first flushing channels and the second flushing channels each have at least one, but not more than eight, depending on the dimensions of the blade. By means of a plurality of first and second flushing channels, the amount of flushing liquid delivered to the front of the blade can be increased according to the size class of the drilling rig.
    O 25 s Preferably, the front part of the second flushing channel is equal in diameter to the rear part. In this case, both at the front and at the rear = the flushing fluid encounters the same flow resistance from the structure of the second flushing channel.
    S 30
    Preferably, the cross-sectional area 5 of the second flushing channel is 80 to 100% of the cross-sectional area of the first flushing channel. This limits the pressure on the soil during drilling.
    In the dimensioning of the flow channel, the first flushing channel and the second flushing channel, the principle is that the total cross-sectional area of the first flushing channel or channels, as well as the second flushing channel or channels, corresponds to the cross-sectional area of the flow channel.
    The drilling rig according to the invention can be used by a method for installing an earth pipe in the ground, the method using a liquid-operated drilling rig comprising at least a pilot blade and a flow channel for delivering rinsing fluid to the pilot blade and a first rinsing channel for rinsing drilling debris.
    The method comprises providing a second rinsing channel passing through the pilot blade drilling direction to guide the rinsing fluid alternately either behind or in front of the pilot blade; - to the drainage channel for rinsing drilling waste.
    In the method, the installation of the ground pipe takes place in the following steps, in which a borehole is drilled in the soil using a drilling rig, the diameter of the borehole made by the drilling rig A 25 is larger than
    In the method, 90 to 100 3% of the rinsing fluid passed through the flow channel is passed to the first = 30 = rinsing channel to avoid overflow of the borehole, and N optionally the rinsing fluid and drilling debris effective pressure caused by the flushing fluid inside the ground pipe. In the method, the rinsing fluid and drilling waste are drilled in the drilling direction into the rear of the pilot blade along the rear of the second flushing channel at the front of the second flushing channel. along the rear of the second flushing channel, the pressure at the front of the second flushing channel exceeds the pressure at the rear of the second flushing channel caused by the flushing fluid inside the ground pipe when drilling above or below the groundwater surface. In this way, the drilling waste generated in front of the drilling rig is recirculated with the rinsing liquid. In addition, the method removes the pilot blade from the ground pipe, leaves the ground pipe in the borehole, and pulls the pilot blade out of the borehole.
    The advantage of the drilling rig according to the invention is that when drilling a borehole in the soil which easily clogs the drilling rig, the pressure exerted by the drilling rig on the soil can be limited to This is achieved = by directing the flushing fluid and drilling waste to a lower pressure level with respect to the effective pressure levels at the front and rear of the second flushing channel. After the first 3 rinsing channels, the rinsing liquid is distributed outside the blade according to the pressure level acting on the front and the back of the second rinsing channel, filling the interior of the ground pipe. The pressure outside the pilot blade rises below the groundwater level in the same proportion as the pressure of the rinsing fluid inside the ground pipe,
    when the rinsing liquid gets sunk into the soil, for example when drilling moraine and mixed soils. If the rinsing liquid cannot spread into the soil, the pressure outside the pilot blade increases, so that the flow of rinsing liquid along the first rinsing channel turns to a lower pressure state, i.e. to the rear of the second rinsing channel and through it into the ground pipe. This avoids flushing the soil in situations where the flushing liquid cannot easily penetrate the soil. When the front of the second flushing channel becomes blocked, the flushing liquid turns to the rear of the second flushing channel. On the other hand, when drilling above the groundwater surface, the hydrostatic pressure of the liquid inside the ground pipe is higher than the rinsing fluid supply pressure, so that the rinsing fluid does not enter the ground pipe significantly with the front of the second rinsing channel open and above the groundwater surface. The rinsing liquid is directed to the second rinsing channel mainly only when the first rinsing channel is blocked or if the soil does not receive the fed rinsing liquid.
    Preferably, when using a drilling rig, the first flushing channel is arranged to connect perpendicularly to the second flushing channel to distribute the flushing fluid according to the pressure in the second flushing channel to either the front N or the back. In this case, the flow of rinsing liquid along the first rinsing channel A 25 impinges perpendicular to the second = rinsing channel, whereby only the pressure levels acting at the front and rear of the second rinsing channel determine in which direction the rinsing liquid flow turns.
    g = 30 According to an alternative embodiment, when the drilling device N is used, a fourth rinsing channel is provided as an extension of the pilot blade flow channel to control the rinsing fluid partial flow in front of the pilot blade to keep the pilot blade clean. However, such a small partial flow does not have the effect of rinsing the drilling waste of the large forward flushing channels of the solutions known from the prior art, but only the cleaning effect of the pilot blade. When using the drilling rig according to the invention, the risks of damage to the structures in the soil are eliminated by limiting the pressure of the rinsing liquid on the soil. At the same time, within the pilot blade, the second flushing channel extending from the flow channel through the first flushing channel to the rear of the pilot blade inside the ground pipe is always open, as drilling waste from drilling cannot pass into the second flushing channel in the first flushing channel and inside the ground pipe. On the other hand, if the pilot blade is well below the groundwater surface, then the hydrostatic pressure caused by the groundwater will drive the drilling debris along the second flushing channel into the ground pipe, keeping the second flushing channel clean. When drilling above the surface of the groundwater, the hydrostatic pressure of the liquid inside the ground pipe is higher than the supply pressure of the rinsing fluid, so that no significant rinsing fluid enters the ground pipe with the forward portion of the second rinsing channel A 25 open and above the groundwater surface.
    Preferably, the drilling device uses a fluid used to effect the impact movement of the drilling device as a rinsing agent. 3 Another advantage of the invention is that it is possible to start the liquid-operated percussion device, i.e. = 30, even if the part of the second flushing channel leading to the pilot blade in front of the pilot along the part in order to initiate the impact movement of the impactor.
    In this case, the natural vibration of the impactor opens the blockages in the first rinsing channel of the pilot blade.
    Preferably, the drilling rig uses a pilot blade for drilling, comprising locking means for releasably locking the pilot blade in the ground pipe during drilling and for disengaging and pulling the borehole after drilling, wherein the locking means seals the pilot blade and ground pipe.
    This allows the pilot blade to be used several times.
    At the same time, the sealing effect of the locking means ensures that no drilling debris enters the pipe between the pipe and the pilot blade.
    When using a drilling rig, the pressure on the soil can be limited to an absolute pressure of at most 20 bar, preferably at most 15 bar, by dimensioning the relationship between the diameters of the second flushing channel and the flow channel.
    In this case, the pressure on the soil is so small that it cannot damage structures already in the soil, such as N piles or structures. 3 25 aN Preferably, when using a drilling rig, the drilling waste is transferred from the drill back completely outside the ground pipe i by means of a rinsing agent if the drilling takes place above the surface water level.
    N 30 N Preferably the rinsing liquid used in the drilling rig is water.
    Water does not cause problems when absorbed into the soil and is therefore safe and inexpensive to use.
    According to one embodiment, when using a drilling rig, 100% of the flushing fluid passed through the flow channel is passed to the first flushing channel to avoid over-flushing of the borehole.
    In this case, no rinsing liquid passes directly from the flow channel directly to the tip of the pilot blade, which could widen the borehole.
    Preferably, when using a drilling rig, the rinsing fluid is continuously fed to the blade at full pressure along the flow channel.
    This eliminates the need to adjust the pressure level during drilling and makes the method easy to use.
    In the installation of an earth pipe acting as a protective pipe in the drilling rig according to the invention, the drilling equipment can be pulled up from inside the earth pipe for drilling the next earth pipe.
    The drilling rig is arranged to drill a larger hole than the outer diameter of the ground pipe to be drilled in the ground.
    Drilling waste is led backwards from the drill bit by means of a rinsing agent, either outside or inside the earth pipe.
    The method and drilling device according to the invention present a solution to the problem of over-rinsing of a borehole with a liquid rinsing agent.
    There is no similar problem with prior art drilling rigs using air as the rinsing medium N, since the air A 25 is compressed in the pile and does not cause the same pressure on the soil = as the substantially uncompressed rinsing fluid.
    On the other hand, the air also travels upwards below the surface of the groundwater, always lighter upwards, unless it is affected by some external CO force. 2 N 30 N The invention will now be described in detail with reference to the accompanying drawings, which illustrate some embodiments of the invention, in which:
    Fig. 1 shows a sectional view of a drill bit according to a first embodiment, Fig. 2 shows a sectional view of a drill bit according to a third embodiment, Fig. 3 shows a sectional view of a drill bit according to a third embodiment, Fig. 4 shows a side view in principle.
    Figure 1] shows the blade of a drilling device 100 according to the invention
    16. The percussion device 24 provided with the supply connection 26 used in the drilling device 100, the pressurized flushing fluid flow directed to the percussion device 24 and the flow passage 9 for directing the flushing fluid flow from the percussion device 24 to said blade 16 for flushing may be prior art. In the embodiment of FIG. 22. The connecting means 8 are attached to the end of the ground pipe 1 so as to seal the distance between the ground pipe 1 and the pilot blade 6 of the N pipe, whereby the rinsing liquid and drilling waste A 25 cannot pass between the ground pipe 1 and the pilot blade 6 = inside the ground pipe 1. In this case, the rinsing liquid and the drilling waste> travel outside the earth pipe 1 in the interval d upwards. The ground shoe preferably used as the connecting means 8 is preferably 3 welded to the end of the ground pipe 1. The connecting means 8 as well as = 30 ground pipe 1 do not rotate during drilling. The pilot blade 6 rotates in the same way as the rotating part 7 rotated by it.
    According to Fig. 1, the rinsing liquid is led along the flow channel 9 and the first rinsing channel 10 to the second rinsing channel 12 and through it on the outer surface of the pilot blade 6 to the tip 20 of the blade 16 as well as preferably the third rinsing channel 11 to the inner surface 7.
    The purpose of the third flushing channel 11 is to provide an overpressure between the drilling part 7 and the pilot blade 6 by means of a flushing liquid, so that drilling debris cannot jam the drilling part 7 in the drilling fluid. rear part 12.2. 90-100% of the rinsing liquid is passed in front of the pilot blade 6 along the front part 12.1 of the second rinsing channel 12 when the drilling takes place above the groundwater surface and the front part 12.1 of the second rinsing channel 12 is open.
    In this case, the hydrostatic pressure of the water column acting inside the ground pipe 1 is higher than the pressure outside the blade 16, whereby the rinsing liquid is directed through the front part 12.1 of the second flushing channel 12 to the front of the blade 16.
    From there, flush the flushing liquid outside the drilling waste earth pipe 1 in the drilling direction backwards.
    When drilling below the groundwater level in a situation where the hydrostatic pressure inside the ground pipe is lower than the pressure outside the blade 16, the N drilling debris released by the blade 16 rises to the front of the second flush channel A 25 12.1. 1 into space 13 at a lower> pressure.
    Such a situation occurs when the soil resists i rinsing liquid so much that the pressure outside the blade 16 3 increases.
    The flushing liquid is discharged along the rear part 12.2 of the second flushing channel 12 = 30 into the ground pipe 1 even if N the front part 12.1 of the second flushing channel 12 is blocked by drilling debris.
    The rinsing liquid can also be led inside the connecting means 8 and the ground pipe 1 partly also by means of a corresponding third rinsing channel 11. However, 90-100% of the flushing fluid in the flow passage 9 is directed to the first flushing channel 10 to avoid overflushing of the borehole.
    There may also be several first flushing channels 10.
    In Figs.
    When drilling clearly below the groundwater surface, the drilling waste enters the second flushing channel 12 and through it into the ground pipe 1.
    According to Figure 1, the thickness of the annular space 28 formed by the shank part is d.
    Flushing fluid and drilling debris exit through the ring space outside or inside the ground pipe 1, depending on the situation.
    Figure 2 shows the blade 16 of a drilling rig 100 according to another embodiment in a borehole 22 drilled in the soil 18. The directions of drilling waste and rinsing fluid, such as water, are indicated by arrows.
    Since the ground pipes N used as pile pipes are installed in sensitive soil, collapse of the borehole A 25 is possible and probable.
    The drill = device according to the invention aims to limit the pressure on the soil to a certain level, for example 10 to 20 bar, whereby the required surface area of the second rinsing channel is reduced by a certain amount of pressurized rinsing liquid, e.g. the area N can be reduced with the pressure applied to the soil and the third flushing channel 11 with a certain amount of liquid, respectively.
    Figure 2 shows a cleaning channel 30 for cleaning the pilot blade 6, by means of which small amounts of rinsing liquid can be directed, 1 to 5% of the total flow channel flow in the drilling direction in front of the pilot blade 6 to keep the pilot blade 6 clean and in working order.
    However, the purpose of this flow is not to flush drilling debris other than for cleaning the pilot blade 6.
    Once the ground pipe is drilled into the rock or target plane, the pilot blade is rotated in the opposite direction to the direction used during drilling.
    In this case, the pilot blade 6 is released from the connecting means 8, i.e. the ground shoe, by means of a bayonet attachment and can be lifted up from the borehole.
    The connecting means 8 and the drilling part 7, if the drilling part is a frengade blade according to Figs.
    Figure 3 shows a third embodiment of a drilling rig according to the invention in a schematic sectional view.
    The third embodiment differs from the embodiments of Figs. = to the front of the second flushing channel 12 12.1 and opposite> first flushing channels 10.2 to the rear of the second flushing channel 12 i 12.2. Thus, the flow of rinsing liquid along the flow channel 9 can flow smoothly in the forward = 30 first rinsing channel 10.1 and the front 12.1 of the second rinsing channel 12 N while the flow rate remains high.
    On the other hand, the rinsing liquid also enters the rear of the second rinsing channel 12 via the opposite first rinsing channels 10.2.
    12.2 at a higher flow rate than in the embodiment of Figure 2, where the flow of flushing fluid impinges perpendicularly to the wall of the second flushing channel 12 as it enters the first flushing channel 10. The higher flow rate can be used to better prevent fouling of the drill.
    All kinds of ring blades can be used as the drill parts of the drilling device, with which it is possible to drill a hole larger than the ground pipe.
    Alternatively, the ring blade remaining in the borehole includes, among other things, drill bits which, after drilling, can be pulled up from the hole, for example by turning them or moving their position.
    As the rinsing liquid, a liquid having a suitable viscosity, such as water or another liquid, can be used.
    Preferably, the rear of the second flushing channel is dimensioned so that, for example, when the operating pressure of the impactor is 100 bar and the fluid flow is 500 rpm, the second flushing channel or channels provide a back pressure of up to 20 bar if the front of the second flushing channel and the third flushing channel are blocked.
    As another example, a situation in which the rinsing liquid is fed at a flow rate of 200 rpm with a diameter of 30 mm is limited to a pressure N of 24 bar when the front A 25 of the second rinsing channel is blocked if the second flow channel is 9 mm in diameter. = The diameter of the flow channel can vary, for example, between 10> - 130 mm.
    In the normal situation where the blade flushing channels T are open, the liquid flows mainly through the second and third flushing channels backwards between the ground pipe and the soil = 30 in the borehole when drilling above the groundwater surface, because there is a higher back pressure inside the groundwater
    On the other hand, when drilling below the groundwater surface at a depth where the pressure inside the ground pipe is lower than outside, the flow of the rinsing liquid turns into the ground pipe along the back of the second rinsing channel. Reference numeral 20 denotes in the figures the tip of the pilot blade 6, i.e. the tip of the drilling rig.
    Preferably, the rinsing agent is also a liquid used to effect the impact movement. The drilling rig according to the invention can be used for drilling earth pipes to form drill piles up to a depth of 2 to 100 m, preferably 5 to 50 m. Figure 4 shows an assembly of a liquid drill 100 for drilling a borehole 22 in the soil 18 according to the invention, which prior art includes an impact device or hammer 106 for forming a bore 22 by rotating and percussive motion, a hammer rotating device 102, a drill rod 104 connected to the rotating device 102 and between the hammer 106 for rotating the hammer 106 and the hammer 106 comprising a flow passage for directing the flushing fluid flow to the pilot blade 6 to be attached to the hammer head. attached = to the body. Furthermore, according to the prior art, the hammer may comprise a reciprocating piston fitted to the frame for striking the pilot blade attached to the lower end of the body i at a selected distance 3 and volumes between the piston and the piston frame for raising and striking the piston = 30. In addition, according to the prior art, the hammer may comprise a valve unit for dispensing the rinsing liquid into volumes and a rinsing liquid pressure unit 108 shown in Fig. 4. OF O
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    权利要求:
    Claims (5)
    [1]
    A fluid-operated drilling rig for drilling a borehole in the ground, the drilling rig (100) comprising a blade (16), an impact device (24) imparting an impact to the blade (16), a pressurized flushing fluid flow directed to the impact device (24) and a flow channel (9) ) for rinsing said blade (16), the blade (16) comprising - a pilot blade (6) for drilling soil (18) adapted to act as a tip (20) of the blade (16), - connecting means (8) removably arranged around the pilot blade (6) 16) for releasably attaching a retractable ground tube (1) to the pilot blade (6), said connecting means (8) being adapted to be tightly attached to the pilot blade (6) preventing rinsing liquid from entering the ground pipe (1) between the connecting means (8) and the ground pipe (1); (7) locked around the pilot blade (6) in the direction of said flow channel (9) after said connecting means (8) in the direction of drilling said blade (16) to increase the diameter of the hole (22), - a first flushing channel (10) formed in said flow channel (9) to the pilot blade (6), A 25 - a second flushing channel (12) formed in the pilot blade (6) = comprising a front portion (12.1) adapted to extend in the drilling direction> the tip (20) of the pilot blade (6) and the rear part (12.2) extending inside the ground tube (1), said front part (12.1) and the rear part 3 (12.2) forming a direct connection through the pilot blade (6), = 30 where the pilot blade (6) is detachable connecting means (8) for pulling the N blade (16) out of the borehole (22) with the ground pipe (22) attached to the pilot blade (6) remaining in the borehole (22) and said first flushing channel (10) being adapted to mate directly with the second flushing channel (12), said first flushing channel (10) is dimensioned so that 90-100% of the flushing fluid of the flow channel (9) is directed to the second flushing channel (12) and thereby in the drilling direction to the front or rear of the second pilot blade. depending on the pressures applied at the front (12.1) and rear (12.2) of the flushing channel (12) to flush the drilling debris while avoiding over-flushing of the borehole (22).
    [2]
    Drilling rig according to claim 1, characterized in that said first flushing channel (10) is connected to the second flushing channel (12) at right angles.
    [3]
    Drilling rig according to protective claim 1 or 2, characterized in that only the second flushing channel (12) extends in the drilling direction to the tip (20) of the pilot blade (6).
    [4]
    Drilling rig according to one of Claims 1 to 3, characterized in that the front part (12.1) of the second flushing channel (12) is equal in diameter to the rear part (12.2).
    [5]
    Drilling rig according to one of Claims 1 to 4, characterized in that the cross-sectional area N of the second flushing channel (12) is 80 to 100% of the area of the first flushing channel (10).
    N JN 25 of the cross-sectional area.
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