• 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:
    The invention relates to a method for mounting ground pipes in the ground, according to which a liquid-powered drilling device (100) is used, according to which method the ground pipe is mounted in the following steps. in the earth (18) a borehole (22) is drilled with the drilling device (100) ,. a ground pipe (1) which acts as a protective pipe is pulled after the pilot drill (6) during drilling ,. the borehole (22) is flushed by means of a liquid flushing fluid ,. the drilling waste arising in front of the drilling device (100) is led backwards together with the flushing liquid. said pilot drill (6) is detached from said ground pipe (1) ,. said ground pipe (1) is left in the borehole and said pilot drill (6) is pulled out of the borehole (22). a second flushing channel (12) is arranged in the pilot drill (6) directly from the flow channel (9) into the ground pipe (1), . the drilling waste generated in front of the drilling device (100) is led by means of the flushing liquid coming from the first flushing channel (10) backwards outside the ground pipe (1) and at least a part of the flushing liquid is led directly from the pilot drill (6) via the second flushing channel (12) into the ground pipe (1) to limit the pressure directed towards the ground (18) when the first flushing channel (10) is clogged. The invention further relates to a corresponding drilling device.
    公开号:SE1750405A1
    申请号:SE1750405
    申请日:2017-03-31
    公开日:2017-10-02
    发明作者:Välisalo Juhani
    申请人:Pirkan Laatupalvelu Oy；
    IPC主号:
    专利说明:

    The invention relates to a method for mounting ground pipes in soil, according to which a liquid-powered drilling device is used, which drilling device comprises at least one pilot drill and. a flow channel for directing flushing water to the pilot drill and a first flushing channel opening in front of the pilot drill, which acts as an extension of the flow channel, according to which the ground pipe installation takes place in the following steps ~ a borehole is drilled in the ground with the drilling device; the pilot pilot drill during drilling, - with. by means of a liquid rinsing liquid the borehole is flushed by passing flushing liquid via the pilot drill's first flushing channel in front of the pilot drill, - the drilling waste arising in front of the drilling device is led backwards together with the flushing liquid, - the said pilot drill is detached where the diameter of the hole made by the drilling device is larger than the diameter of the pipe.
    Previously, a method according to the above introduction of rinsing agents is forced to be known, where with a flushing system one into the ground under pressure, whereby in the worst case the entire working pressure of a liquid-driven percussion device is directed towards the ground, i.e. a sledgehammer which causes damage to structures in the ground. Furthermore, when a drilling device is clogged e.g. in low-soil soil it is not even advisable to start the submersible hammer, since the pressure medium cannot flow out on the outlet side of the drill for the pressure medium when the drill is clogged via the flushing channel, whereby the necessary pressure difference (working pressure-outlet pressure) cannot occur.
    Liquid-powered submersible hammers are used instead of pneumatic submersible hammers in drilling devices to avoid problems in connection with flooding. From the state of the art, the Finnish patent application FI 20130297 is known, which describes a pneumatic drilling device. The use of compressed air often causes flooding of the borehole, which removes too much soil from the borehole. The use of compressed air can also cause danger when drilling waste is flushed away with high pressure upwards.
    In addition, from the state of the art, the publication US 2015/0330151 A1 is known, liquid-powered which describes a drilling device. In this solution, the flushing fluid to be passed through the flushing channel in front of the pilot drill is led directly in front of the pilot drill between the expansion drill and the pilot drill into the ground pipe attached to the pilot drill. In the event of clogging, the flushing waste clogs this channel between the pilot drill and the expansion drill and impedes the flow of the flushing fluid both through the previously mentioned channel and through the flushing channel which comes in front of the pilot drill, whereby the necessary pressure difference does not occur. for starting the percussion device, i.e. the sledgehammer.
    The object of the invention is to provide a better method than the state of the art for creating a borehole with a drill which uses liquid flushing, by means of which method the pressure directed towards the ground can be limited when the flushing channel which is directed forward is blocked and allows advantageous also start of a clogged drilling device. The characterizing features of the invention appear from appended claims 1. The object of the invention is also to provide a 10 better drilling device with liquid flushing than a drilling device according to the prior art for creating a borehole with a drill using liquid flushing, by means of which method it presses which is directed towards the ground can be limited when the flushing channel which. is directed forward is set again and advantageously also enables the start of a clogged drilling device. The characterizing features of the invention appear from appended claims 6.
    This can be accomplished with. a method for mounting ground pipes in soil, according to which a liquid-powered drilling device is used, which drilling device comprises at least one pilot drill and a flow channel for directing rinsing water to the pilot drill and to a first opening in front of the pilot drill. rinsing channel, which. works as. the extension of the flow channel. According to the procedure, the ground pipe is installed in the following steps, where it is connected to the pilot drill. a second flushing channel is arranged directly from the flow channel into the ground pipe, a hole is drilled in the ground below. help with the drilling device, that which. acts as a protective pipe drawn during drilling and the borehole ground pipe after the pilot drill is flushed with a liquid flushing fluid by passing flushing liquid via the pilot drill's first flushing channel in front of the pilot drill. Furthermore, according to the procedure, the drilling waste arising in front of the drilling device together with the flushing fluid is led backwards outside the ground pipe and at least a part of the flushing fluid directly from the pilot drill via the second flushing channel i11 in the downpipe. In addition, according to the procedure, the pilot drill is detached from the ground pipe and the ground pipe is left in the ground and the pilot drill is pulled out of the borehole. According to the method, the diameter D of the borehole made by the drilling device is larger than the diameter of the ground pipe. The advantage of a method according to the invention is that when drilling a borehole in soil, which easily clogs the drilling device, the pressure caused by the drilling device against the ground can be limited to a selected maximum value. This is achieved in such a way that when the first flushing channel of the drilling device which is led in front of the pilot drill is clogged, the flushing liquid is directed to the second flushing channel of the pilot drill, which leads the flushing liquid straight into the ground pipe. Thus, with the right dimensioning, the pressure directed towards the ground can be limited, when there is always an open channel for flushing liquid out of the flow channel. Advantageously, the flushing liquid which is led into the ground pipe can be used as a pressure medium. for the percussion device's percussion device, the flow from the percussion device coming to the pilot drill coming back to the percussion device inside the ground pipe and enabling the percussion device to start. The kind of percussion device loosens on its side, the drilling waste that. is located in the pilot drill's first flushing channel and restores the drilling device's operability.
    With a method according to the invention the risks of damaging constructions in the marks are eliminated by limiting the pressure directed by the flushing liquid towards the ground. At the same time, the second flushing channel is inside the pilot drill. which runs straight from the flow channel to the rear of the pilot drill inside the ground pipe because the waste that is always open during drilling cannot get to it. second flushing channel due to overpressure prevailing in the first flushing channel. During normal operation, the hydrostatic pressure of the liquid inside the pipe is higher than the supply pressure of the flushing liquid, whereby no flushing liquid enters the second flushing channel when the first flushing channel is open. Flushing liquid goes to the second flushing channel mainly only when the first flushing channel is clogged. 10 5 Preferably, according to the method, a part of the flushing liquid is led via the second flushing channel straight into the ground pipe without leading flushing liquid outside the pilot drill. Thus, there is no drilling waste together with the flushing liquid that passes through the second flushing channel, so drilling waste cannot clog the other flushing channel.
    Preferably, according to the method, the liquid used to effect the percussion movement of the drilling device is used as flushing liquid and the flushing liquid is led through the second flushing channel in the ground pipe and back to the percussion device to guarantee the return pressure of the percussion device. A second advantage of the invention is that the liquid-driven percussion device, i.e. the submersible hammer can be started, even if the first flushing channel leading in front of the pilot drill would be completely clogged, since a sufficient amount of flushing liquid leaving the submersible hammer is directed into the pipe on the so-called free return side via the second flushing channel, so that the percussion movement of the percussion device can be started. In this case, the natural vibrations of the percussion device open the stop in the pilot coil's first flushing channel.
    Preferably, according to the method of drilling, pilot drill is used, which comprises locking devices for releasably locking, the pilot drill * at the 1nark pipe during * drilling_ and loosening by twisting and pulling out of the borehole after drilling, where the locking devices seal the space between get into the ground pipe around the pilot drill and the locking devices. In this way, the pilot drill can be used several times. At the same time, with the aid of the locking devices, the sealing effect is ensured that drill bits do not enter the pipe. between the pipe and the pilot drill, which could impede the flow of the flushing liquid through the second flushing channel back to the percussion device of the drilling device. According to the method, the pressure directed towards the ground can be limited by means of dimensioning of the mutual relationship between the diameter of the second coil channel and the flow channel to a maximum of 20 bar, preferably a maximum of 15 bar absolute pressure. The pressure directed towards the ground is so small that it can not damage existing ground. constructions such as piles or constructions.
    Drilling waste is advantageously moved by the flushing agent backwards completely outside the ground pipe.
    The rinsing bag water used according to the procedure is advantageous. Water does not cause problems when it is absorbed into the soil and is therefore harmless and advantageous to use.
    The object of a liquid-driven drilling device according to the invention can be achieved with a drilling device for drilling boreholes in earth, which drilling device comprises a drill, a percussion device which gives the drill a percussion movement, a fluid flow pressurized to the percussion device and a flow channel. pre-flush. The drill comprises a pilot drill for drilling in the ground arranged to act as a drilling tip, coupling device releasably arranged around the pilot drill for releasably attaching the ground pipe pulled to the pilot drill and an extension part locked around the pilot drill in the flow channel direction after the coupling devices increase the diameter of the drill hole. The coupling devices are arranged to be tightly attached to the pilot drill and to prevent flushing liquid from entering the ground pipe and the coupling devices and the ground pipe. In addition, the drill comprises a first flushing channel formed from the flow channel of the pilot drill to the outside of the pilot drill in front of the drilling device in the drilling direction to direct flushing fluid between the drilling device and the ground to flush drilling waste substantially backwards outside the pilot drill. in the number pipe to lead a part of the flushing bag directly into the narcotics pipe to be attached to, the pilot drill to limit the pressure against the ground when the first flushing channel is clogged. The pilot drill is detachable from its coupling devices to allow the drill to be removed from the borehole when the ground pipe attached to the pilot drill remains.
    In a drilling device according to the invention, the ground pressure is limited by means of the second flushing channel without at the same time limiting the pressure used by the percussion device. Through the flow channel, flushing bag can be fed to the drill at full pressure at all times, since it is the first flushing channel. clogged, it is possible to direct the flushing bag to the second flushing channel and thus into the pipe without the pressure against the ground rising too much.
    Advantageously, the coupling devices are a drill shoe. With the help of the drilling shoe, the ground pipe can be connected to the expansion part so that the expansion part can be detached from the drilling shoe at the end of the drilling to pull the drilling shoe out of the borehole.
    Preferably, the second flushing channel is directed backwards in the drilling direction towards the back of the pilot drill. In this case, the second flushing channel can be a straight bore, which is easy to manufacture.
    Advantageously, the second flushing channel extends from the flow channel to the inside of the ground pipe to a space between the ground pipe emanating from the flow channel and the drilling device. The second flushing channel is at a distance from the first flushing channel and thus it is highly unlikely that drilling waste will enter and clog the second flushing channel due to the hydrostatic pressure which acts in the second flushing channel.
    Advantageously, the striking device comprises a supply connection for sucking flushing bag from inside the ground pipe and the striking device is arranged to use the flushing bag from the drilling of the ground pipe to effect the striking movement. In this case, in addition to a limitation of the pressure, the drilling device is started when the first flushing channel is clogged, when flushing bag can be led via the second striking device, the flushing channel to which stroke in turn opens up the clogging of the first flushing channel. - 50%, preferably 30 - 40% of the flow channel diameter. In this case, in the event of a clogging of the first flushing channel, the second flushing channel is large enough to reduce the pressure to the selected maximum pressure level.
    According to one embodiment, the second flushing channel comprises a radial part transverse in the axial direction of the drill and the axially directed axial part of the drill, which axial part extends to the rear side of the expansion part. This is an alternative to the form of application, for performing a second. flushing channel extending directly behind the pilot drill.
    The diameter of a pilot drill in a drilling device according to the invention can be 5 - 100 cm, preferably 10 - 50 cm. In this case, the drilling device is sufficiently large in view of the installation of drill piles inside the ground pipes. l0 Other flushing channels can be at least one, but a maximum of eight according to the dimension of the drill.
    The invention relates to a method for installing a ground pipe acting as a protective pipe in soil, wherein the ground pipe can be left in the ground after drilling and the drilling equipment is pulled up from the ground pipe for drilling the next ground pipe. The drilling equipment 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 with the help of the flushing fluid. A method and a drilling device according to the invention show a solution to the problem of flushing fluid arising from the borehole. In prior art drilling devices that use air as the flushing medium, since air is compressed and not corresponding problems arise, * causes corresponding pressure; towards the earth as. a substantially uncompressed flushing fluid.
    In the following, the invention is described in detail with reference to the accompanying figures, which. illustrates some applications of the invention, in which a drilling device Figure 1 shows in cross section the drill according to a first application form, Figure 2 shows the drill: in a. drilling device 'according to a second form of application in the borehole. Figure 1 shows the drill 16 in a drilling device 100 according to the invention. The percussion device 24 used in the drilling device 100 equipped with the feeding device 26, the pressurized flushing fluid flow led to the percussion device 24 and the flow channel 9 for directing the flushing fluid flow from the percussion device 24 to the said drill 16 for flushing can be according to the prior art. In an application form according to Figure 10 10, the drilling device 100 comprises the pilot drill 6 and one on its neck advantageously. By. bayonet locking attached extension part7. The expansion part 7 can be a drill bit which is left in the borehole after drilling as in Figures 1 or 2, or a so-called expansion drill, which can be rotated to a position in which it can be removed from the borehole 22. The coupling devices 8 are attached to the end of the ground pipe 1 so that they seal the intermediate ground pipe 1 and the pilot drill 6, whereby flushing fluid and drilling debris can not come between the ground pipe 1 and the pilot drill 6 into the in-pipe 1. In this case, flushing bag and drilling waste on the outside of the in-pipe 1 ascend in the needle cavity d. The drill shoe advantageously used as coupling device 8 is advantageously welded to the end of the in-pipe 1. The pilot drill 6 rotates and also the extension part 7 rotated by it.
    Flushing fluid. led genon1 flow channel. 9 cx fl in the first flushing channel IH) on the outer surface of the pilot drill <5 to the l6 tip of the drill 20 as also by means of a third flushing channel llt to the inner surface of the expansion part 7. The purpose of the third flushing channel 11 is to obtain by means of the flushing fluid an overpressure between the expansion part 7 and the pilot drill 6, whereby drilling waste cannot come between and stop the expansion part 7. For the flushing liquid a second flushing channel 12 has been arranged, which is advantageously guided the pilot drill 6 into a space 13 formed in the ground pipe 1, so that when the first flushing channel 10 is clogged, flushing bag can be flushed out inside the ground pipe 1 without being in contact with the drilling waste. The second flushing channel 12 is also arranged so that it has a reducing effect on the pressure in the flow channel. 9 and. the first flushing channel. 10 when the first flushing channel 10 is clogged by drilling debris which loosens the iodine during drilling. Flushing liquid can also be led to the inside of the coupling devices 8 and the ground pipe 1 partly also by means of the corresponding third flushing channel 11. In the figures mainly the pipes. 1 and_ 2 flushing fluid and. drilling waste by circulating via depressions, openings, bores or other arrangements made possible in the expansion part 7 outside the coupling devices 8 and the ground pipe 1 to one at the drilling between. the ground pipe 1 and the earth 18 formed annulus 28 and thence upwards. Under no circumstances does drilling waste enter the second flushing channel 12 due to the overpressure prevailing in flow channel 9. The thickness of the annulus 28 formed by the expansion part is according to Figure 1 d. Flushing fluid and drilling waste exits via the annulus upwards outside the ground pipe 1 without at any stage walking on the inside of the ground pipe 1.
    In Figure 2, the drill 16 in a drilling device 100 according to another embodiment is in a borehole 22 drilled in the ground 18. The directions of movement for drilling waste and flushing fluid, such as e.g. water, are excellent with arrows. Since ground pipes used as piling pipes are mounted in sensitive soil, it is possible and probable that the borehole will collapse. In a method according to the invention, the aim is to limit the pressure directed towards the earth n fi ximally to a certain level, e.g. 10 - 20 bar, whereby the area by which the second flushing channel needs to be calculated for a certain amount of pressurized flushing liquid e.g. water, wherein by increasing the area of the second flushing channel or channels 12, the pressure against the first flushing channel 10 and the third flushing channel 11 at a certain amount of liquid. corresponding can be lowered. Figure 12 shows the second flushing channel 12 used for the pressure reduction, which connects to an axial directional space 13 present inside the ground pipe 1 for lowering the pressure of the flushing liquid in the flow channel 9 when the first flushing channel 10 is clogged. In Figure 2, the second flushing channel 12 consists of two parts, one of which is in the radial direction of the drilling axis and the other in turn 12 in the direction of the drilling axis. This river: an alternative form of application for the second flushing channel 12 which faces directly obliquely backwards in Figure 1.
    When a ground pipe has been drilled to rock or to a predetermined level, the pilot drill is rotated in the opposite direction to the direction used in drilling. In this case, the pilot drill 6 is released by means of the bayonet bracket from the coupling devices 8, i.e. from the drill shoe and can be lifted out of the borehole. The coupling devices 8 and the expansion part 7, if the expansion part is a ring crown according to Figures 1 and 2, remain in the borehole 22. If the expansion part is an expansion drill, the expansion part can also be lifted out of the borehole after drilling GH.
    As the expansion part of the drilling device, all possible crowns can be used, with which it is possible to drill a larger hole than the ground pipe. An alternative to the crowns that remain in the borehole is i.a. expansion drills, which after drilling can be pulled out of the hole by e.g. turn them or move their position.
    Liquid of suitable viscosity, such as water or other liquid, can be used as the rinsing liquid. The second flushing channel is advantageously dimensioned so that when the operating pressure of the percussion device e.g. is 100 bar and the liquid flow is 500 l / min, the second flushing channel or channels causes a maximum new pressure to the liquid flow of 20 bar, if the first flushing channel and the third flushing channel are clogged.
    As a second example can be seen when flushing liquid is fed at 200l / min via a flow channel with 30 mm diameter, the maximum pressure directed with the ground can be limited to 24 bar when the first flushing channel. is clogged if. the. second flow-when the diameter of the drill needle is 9 mm. In a normal situation, 13 flushing channels * are open, flowing “the liquid. mainly via the first and third flushing channels between the ground pipe and the earth backwards in the borehole, since in the flow channel there is a higher back pressure due to the hydrostatic pressure in the liquid inside the ground pipe. Reference numeral 20 denotes in the figures the tip of the pilot drill 6, i.e. the tip of the drilling device.
    Presumably, the flushing fluid is also the fluid used to effect the striking motion.
    A method according to the invention can be used in drilling ground pipes for creating drilling piles to a depth of 2 ~ 100 m, preferably to a depth of 5 ~ 50 m.
    权利要求:
    Claims (10)
    [1]
    A method of mounting ground pipes in soil, according to which a liquid-powered drilling device (100) is used, which drilling device (100) comprises at least one pilot drill (6) and a flow channel (9) for guiding flush water to the pilot drill (6). and a first flushing channel (10) opening in front of the pilot drill (6), which acts as an extension of the flow channel (9), according to which the mounting of the pipe is carried out in the following steps - in the ground (18) a borehole (22) is drilled with the drilling device ( 100), - a ground pipe (1) which acts as a protective pipe, the back pilot drill (6) is pulled during drilling, - by means of liquid flushing fluid the borehole (22) is flushed by passing flushing liquid via the pilot pipe's first flush (10) (6) , (100) duct in front of the pilot drill - the drilling waste arising in front of the drilling device is led together with the flushing fluid backwards, - the said pilot drill (6) is detached from the said ground pipe (1), - the said ground pipe (1) is left in the borehole and the said pilot drill ( 6) dras bo from the borehole (22), where the diameter of the borehole (22) made by the drilling device (100) is larger than the diameter of the ground pipe (1), characterized in that - a second flushing channel (12) (1) is provided in the pilot drill (6). ), - the drilling waste which arises in front of the drilling device straight from the flow channel (9) into the ground pipe (100) is led by means of the flushing bag coming from the first (10) backwards outside the ground pipe (1) and the flushing channel- at least a part of the flushing liquid is led directly from the pilot drill (6) via the second flushing channel (12) into the ground pipe 10, characterized in that a pilot drill (1) is used during the drilling to limit the pressure directed towards the ground (18) when the first flushing channel (10) is clogged. characterized in that a (12)
    [2]
    Method according to claim 1, part of the flushing liquid is led via the second flushing channel through the second flushing channel (12) directly from inside the pilot drill (6) into the ground pipe (1) without guiding the flushing liquid outside the pilot drill (6).
    [3]
    Method according to claim 1 or 2, characterized in that the bag used to effect the stroke of the drilling device (100) of the drilling device (100) is used as flushing liquid and the flushing liquid is circulated through the second flushing channel (12) into the pipe (1) and back to the percussion device (24) to secure the return pressure of the percussion device (24).
    [4]
    A method according to any one of claims 1 - 3, sensing (6), which comprises locking devices (8) for releasably locking during drilling and loosening (22) the pilot drill (6) at the ground pipe (1) it by turning and pulling out of the borehole after drilling, where the locking devices (8) seal the space between the pilot drill (6) and the ground pipe (1), which prevents flushing fluid from entering the ground pipe (1) between the pilot drill (6) and the locking devices (8).
    [5]
    Method according to one of Claims 1 to 4, characterized in that the pressure directed towards the ground (18) is limited to a maximum of 20 bar by the dimensioning of the mutual ratio between the diameter of the second flushing channel (12) and the diameter of the flow channel (9), preferably maximum 15 bar absolute pressure. 16
    [6]
    Liquid-driven drilling device for drilling boreholes in earth, which drilling device (100) comprises drill (16), single-stroke device (24) which provides a percussion movement to the drill (16), to the percussion device (24) led pressurized flushing fluid flow and flow channel (9) to directing said flushing fluid flow from the percussion device (24) to it. said pre-flushing drill (16), the drill (16) comprising a pilot drill (6) for drilling in the ground (18) arranged to function as the tip of the drill (16), - coupling devices (8) releasably arranged around the pilot drill (6) for releasably attaching the ground pipe (1) being pulled after the drill (16) at the pilot drill (6), - 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) drilling direction for increasing the diameter of said borehole (22), a first flushing channel (10) formed from said flow channel (9) of the pilot drill (6) to the outside of the pilot drill (6) in front of the drilling device (100) in its drilling direction to conduct flushing fluid between the drilling device (100) and the ground (18) for flushing drilling waste substantially backwards outside the ground pipe (1) attached to the pilot drill (6), where the pilot drill. (6) is detachable from its coupling devices (8) for the drill (16) it must be possible to pull it out of the borehole (22) when the nozzle tube (1) attached to the pilot drill (6) remains in the borehole (22), characterized in that the drill (16) further comprises a second flushing channel (12) formed in the pilot drill (6), which extends into the ground pipe (1) to direct some of the flushing liquid directly to the inside of the ground pipe (1) which is attached to the pilot drill (6) for limiting the the pressure directed towards the ground (18) and the said coupling devices (8) are arranged to be fastened close to the pilot drill (6), which prevents the stroke device characterized in that the second flushing channel 17 of the flushing bag enters the number pipe (1) between the coupling devices (8) and the ground pipe (1).
    [7]
    Drilling device according to claim 6, characterized in that it (12) extends from the flow channel second flushing channel (9) into the ground pipe (1) to a space (13) between the ground pipe (1) and the drilling device (100).
    [8]
    Drilling device according to claim 6 or 7, characterized in that said second flushing channel (12) is directed. drilling direction back to the back of the pilot drill (6).
    [9]
    Drilling device according to any one of claims 6 - 8, sensing (24) comprising a supply means for sucking flushing liquid from inside the ground pipe (1) (24) closure (26) and the striking device is arranged to use flushing liquid from the drilling of the ground pipe (1) to production of percussion movement ~ SGD.
    [10]
    Drilling device according to one of Claims 6 to 9, (12) diameter is 20 to 50%, preferably 30 to 40% of the diameter of the flow channel (9).
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    法律状态:
    优先权:
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