• 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:

    公开号:NL2014728A
    申请号:NL2014728
    申请日:2015-04-28
    公开日:2016-03-08
    发明作者:Franciscus Boere Wilhelmus
    申请人:Visser & Smit Bv；
    IPC主号:
    专利说明:

    Retract the pipe with horizontally controlled drilling.
    This invention relates to the insertion of the pipe into the borehole of a horizontally controlled bore or bore made in the subsurface using other drilling techniques.
    Horizontally controlled drilling (HDD drilling) is known, for example, from US5242026. For example, for the construction of an underground utility such as a pipe for water, gas, electricity or communication, a road or water body or other obstacle can be passed underneath without drilling an open trench.
    As a rule, the underground borehole is filled with a support fluid while the pipe is being drawn into it. Especially with a plastic tube that tends to float in the support fluid contained in the borehole, this tube is filled with ballast to reduce or prevent rubbing of the advancing tube along the wall of the borehole. See, for example, RU2384673. Usually, the ballast is the support fluid present in the borehole which flows into the tube from the borehole through openings provided for this purpose in the draw head at the front end of the tube. However, via this route also sand or other material from the wall of the borehole ends up inside the retracted pipe, which becomes contaminated as a result. These contaminants complicate the later use of the tube, for example the installation inside the tube of cables and the like. or the flow of medium through the tube, after the tube has been completely retracted, and are difficult to remove. Another disadvantage is that the filling of the pipe with this ballast cannot be properly controlled and the pipe fills more and more slowly with this ballast as the pipe is pulled deeper into the borehole.
    A well-known alternative to ballasting the pipe during retraction is the ballast material from the rear end of the pipe outside the borehole, through the pipe, for example via a feed line inserted from above ground axially into the rear end of the pipe, dosing within the part of the tube located in the borehole. This is a complex solution.
    By "leading end of the pipe" is meant the axial end of the pipe which is first drawn into the entry hole of the bore and travels through the entire length of the bore hole during retraction and finally at the exit hole of the bore comes out of the ground again. As a rule, this front end is attached to the drawbar via a draw head. By "rear end of the tube" is meant the other axial end of the tube. By "input hole of the bore" is meant the axial access hole to the bore hole through which, in the initial phase of the retraction, from ground level resp. above ground the front end of the pipe to be inserted enters the borehole and "bore exit hole" means the axial access hole opposite the entrance hole to the borehole through which, in the final phase of retraction, the front end of the tube to be retracted leaves the borehole and returns to ground level resp. above ground. By "retraction tube" is meant the tube to be retracted.
    The object of the invention is to improve the ballasting of the tube during the retraction. To this end, it is proposed to feed the ballast material, or an alternative material, to the draw head or the front end of the tube, via a hole extending from above ground into the underground borehole and outside the tube to be retracted, relative to the borehole sealed, ballast supply channel which ends in the draw head or in the front end of the pipe or the part of the pipe in the vicinity of the front end. Preferably, this ballast supply channel extends from above-ground through the exit hole and the portion of the borehole upstream of the front end of the insertion tube, in the phase of insertion that the front end of the tube is in the borehole. This ballast supply channel preferably comprises one or more of the drawbar, the swivel and the drawhead.
    Thus, in a preferred embodiment, the ballast is supplied via the drawbar to the tube as it is retracted.
    During retraction, in a preferred embodiment, the ballast fluid flows via its own medium-tight conduit to the retraction tube in the direction opposite to the direction in which the tube is pulled through the borehole.
    Preferably, all the material is supplied via the ballast supply channel so that the part of the intake pipe located in the borehole is completely filled, preferably so that that part floats along its entire length in the supporting fluid in the borehole, in other words, nowhere supports along its length against the wall of the borehole.
    Instead of ballast, such as liquid, supplying a different material to the feed tube. Instead of supplying a material to the retraction tube via this route, it is conceivable to discharge a material from the retraction tube. Instead of retracting the tube, pushing in, or a combination of retracting and pushing in, is conceivable. Upon withdrawal, the tube is pulled from the exit hole, when pushed in, the tube is pushed from the entry hole. It should be clear that the tube is radially sealed so that no liquid can penetrate from the borehole into the insertion tube via its wall.
    Another advantage of the invention is that the tube being retracted can be used to process support fluid that is released from the exit hole during retraction, so that little or no support fluid released from the borehole needs to be stored at that end of the borehole for example a reservoir. This is advantageous, for example, when there is a lack of space on that side, for example in the case of an artificial work island. This support fluid can be stored in the tube to be retracted and transported via that tube to the entrance hole of the borehole.
    The invention makes it possible to completely seal the intake pipe and / or the draw head relative to the borehole.
    Between the drawbar and the draw head a tensile-resistant swivel is generally used, which allows free axial rotation of the draw head relative to the draw bar, while the swivel transmits the draw force from the draw bar to the draw head. See, for example, US6637969. US3405980 discloses a swivel which has a through-going axial channel for vertical drilling. Now, for the first time in HDD drilling, a swivel is used that is constructed in such a way that ballast can flow from the drawbar through the swivel into the draw head and / or the tube to be retracted.
    The drawbar preferably connects to the tube to be retracted via an axially variable angle and / or length-adjustable pipe part, which pipe part is preferably tensile because, via this pipe part, the tensile force is preferably transferred from the drawbar to the tube to be retracted. . This line part comprises a ballast line and thereby mutually puts the drawbar and the tube to be drawn in in fluid communication. For example, this pipe part comprises one or more of: means for allowing a limited variation of the axial angular position and / or length, for example a minimum of 2 or 5 and / or a maximum of 5 or 10 or 20 degrees for the angular position, minimum 1 or 2 and / or a maximum of 2 or 5 or 10 mm for the length, for example with the use of so-called Dywidag rods or threaded rods; a strain relief that preferably bridges the ballast line; a flexible ballast line, for example a hydraulic hose; a flange assembly with ample clearance.
    The draw head is arranged to provide one or more of the following: to seal the front end of the tube to be drawn in from the environment; to put this end in fluid communication with the drawbar or other ballast line; to transfer the pulling force from the drawbar to the tube to be retracted.
    The field of application of the invention is, for example, a borehole with a diameter of at least 200 mm and / or at most 1000 or 1500 mm (for example 600 mm) or a draw-in pipe with a diameter of at least 100 mm and / or at most 1000 or 1500 mm (for example 450 mm). The intake tube is, for example, of polymeric material such as PE or metal. The length of the borehole is, for example, at least 100 or 1000 meters.
    The invention is now elucidated on the basis of a non-limiting example of protection, reference being made to the accompanying drawing. It shows:
    FIG. 1-4 the principle of HDD drilling;
    FIG. 5 shows a pipe part in side view;
    FIG. 6 the section along line A-A in fig. 5; and
    FIG. 7 shows the part of FIG. 6 in a different position.
    FIG. 1-4 shows the principle of HDD drilling, whereby a borehole with an entrance and an exit is made above ground (pilot drilling, Fig. 1), then, in the opposite direction of moving through the ground, the diameter of the borehole is increased by a wider (reaming, Fig. 2), then the tube is retracted, in the same direction of moving through the ground as during reaming (Fig. 3). The clearance may be missing. Figure 4 shows the completed situation.
    FIG. 5-7 show the pipe section that is variable in angular position with the draw head and the tube to be retracted on the right, and the swivel and draw rod on the left (both not visible). This pipe part comprises a hydraulic hose extending between the mounting flanges which mutually puts the draw head and the draw rod in fluid communication. The hydraulic hose is protected against axially directed tensile forces by a strain relief that comprises a number of axial tie rods placed around the hydraulic hose that keep the mounting flanges at the desired distance. In the assembly of mounting flanges and tie rods there is a clearance of a few mm so that the flanges can vary mutually limited in distance (a few mm) and mutually limited in parallel (maximum 14 degrees, see fig. 7 which shows that both ends each over 7 degrees are pivoted relative to Fig. 6). The hydraulic hose has an excess length that takes into account this play between the mounting flanges. This excess length is shown in Fig. 6 by a winding course of the hose.
    During retraction, ballast fluid, preferably above ground, is metered into the drawbar, flows through the drawbar and through the swivel, then flows through the angular position variable pipe part and then flows through the drawhead to finally enter the front end of to flow into the draw tube. It is ensured that the part of the tube located in the borehole is completely filled with ballasting fluid originating from the drawbar, so that this part of the tube moves as smoothly as possible into the support fluid located in the borehole.
    权利要求:
    Claims (10)
    [1]
    A method of installing a liquid-tight pipe in the subsurface by means of drilling technology, in particular HDD technology, using an underground borehole which is connected to above-ground via an entrance hole at one end and an exit hole at its other end, borehole is made by inserting a drill into the ground from ground level which drills the path of the borehole through the ground to get out of the ground further down the ground level so that the drill enters and exits at the entrance and exit holes. soil goes at ground level, and which borehole is filled with supporting fluid and into the finished borehole the tube is inserted by advancing it axially into the borehole from the entrance hole to the exit hole, dosing material being dosed into the tube during installation via a supply channel extending through the borehole and outside the tube and sealed with respect to the borehole.
    [2]
    The method of claim 1, wherein the metering material flows through the feed channel located in the borehole in the direction opposite to the direction in which the tube travels through the borehole.
    [3]
    3. Method as claimed in claim 2, wherein on the tube a pulling member, such as a pulling rod, is mounted, which pulling member protrudes from the exit hole with its end being pulled and wherein the feed channel in the borehole comprises this pulling member and the dosing material inwards into the tensile member is dosed and dosed into the tube from this tensile member.
    [4]
    A method according to any one of the preceding claims, wherein metering dosing material ensures that the tube floats in the borehole in the supporting fluid because ballasting material is used as dosing material.
    [5]
    A method according to any one of the preceding claims, wherein the dosing material is dosed into the tube via an axially flexible intermediate piece located in the vicinity of the tube.
    [6]
    A method according to any one of the preceding claims, wherein the tube that is being retracted is completely liquid-tightly sealed with respect to the borehole.
    [7]
    A method according to any one of the preceding claims, with application between the drawbar and the tube of a tension-resistant so-called swivel, which allows free axial rotation of the tube relative to the drawbar, while the swivel allows the tensile force from the drawbar to the tube which swivel is constructed in such a way that ballast flows through the swivel through the swivel into the tube.
    [8]
    Method as claimed in any of the foregoing claims, wherein the drawbar connects via an axially variable pipe part and length to the pipe to be retracted, which pipe part is tensile and via this pipe part the tensile force from the draw bar becomes on the pipe to be retracted transferred, and which line part mutually puts the draw bar and the tube to be drawn in in fluid communication and the dosing material flows from the draw bar through the line part into the tube.
    [9]
    9. Method according to one of the preceding claims, the borehole has a diameter of a minimum of 200 mm and a maximum of 1000 mm, the draw-in pipe has a diameter of a minimum of 100 mm and a maximum of 1000 mm, the draw-in pipe is of polymeric material, the length of the borehole is at least 1000 meters.
    [10]
    An HDD device for carrying out the method according to any one of the preceding claims according to the HDD technique, which comprises the tube to be retracted, the drawbar, the swivel, the pipe part and a drawhead, configured such that dosing material through the drawbar swivel and the pipe part flows to the draw head and flows through the draw head into the tube, said pipe part comprising: - means for allowing a limited variation of the axial angular position and length, namely a minimum of 2 and a maximum of 10 degrees for the angular position of a minimum of 2 and a maximum of 10 mm for the length; - a strain relief that bridges the dosing line for dosing material; - a flexible dosing line that is part of the fluid connection between the drawbar and the tube; - Flange mounting with ample clearance.
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    同族专利:
    公开号 | 公开日
    NL2014728B1|2016-09-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20070154269A1|2002-03-29|2007-07-05|Quigley Peter A|Systems and methods for pipeline rehabilitation|
    RU2384673C2|2008-06-16|2010-03-20|Общество С Ограниченной Ответственностью "Газпром Трансгаз-Кубань"|Method to control ballasting of pipeline pulled in horizontal well under water and other natural obstacles by horizontal drilling plant|
    法律状态:
    2020-12-09| PD| Change of ownership|Owner name: VOLKERWESSELS INTELLECTUELE EIGENDOM B.V.; NL Free format text: DETAILS ASSIGNMENT: CHANGE OF OWNER(S), ASSIGNMENT; FORMER OWNER NAME: VISSER & SMIT HANAB B.V. Effective date: 20201117 |
    优先权:
    申请号 | 申请日 | 专利标题
    NL2012714|2014-04-29|
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