• 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:
    BACKGROUND OF THE INVENTION The invention relates to a device for detecting the presence of a cavity in a drill bit for receiving one comprising an elongate actuating means comprising a measuring tube, the measuring tube being provided with at least one means for conveying a measuring medium which is pressurization. (fig. ta)
    公开号:SE1350239A1
    申请号:SE1350239
    申请日:2013-02-28
    公开日:2014-08-29
    发明作者:Leif Gustafsson；Sture Åberg
    申请人:Malmfälten I Norr Ab；
    IPC主号:
    专利说明:

    direct surroundings. When using the method and the system according to the said document, the reinforcing means is inserted into a borehole shortly after the borehole has been filled with uncured filling mass which risks penetrating the holes, the openings in the channel wall.
    This is solved by providing the holes, the openings, with a covering surface layer, a cover of a thin-layered material, a rubber cloth, a plastic film, or a thin film of paint or tape. When applying pressurized medium, the casing is pushed away from the holes, and penetrates unless there is a cavity. Whether there is a cavity or not, the protective cover is usually destroyed. This means that if there is no cavity, and the protective cover has been destroyed by the pressurization, the filling mass can penetrate into the opening. The filling mass then risks clogging the duct, which can then not be used for the intended purpose. This risks affecting the measurement result.
    There is therefore a need to design the channel so that the problem of penetrating filling mass through the holes, the openings, is avoided.
    An object of the present invention is therefore to provide a device for detecting the presence of a cavity in a borehole solves the problems of penetrating filling mass in the measuring channel.
    This object of the invention is solved by a device according to claim 1. Other features and advantages of the invention appear from the subclaims.
    Advantages and positive effects of the invention will be described below on the basis of exemplary embodiments of the invention and with reference to the figures which show: Fig. 1a schematically shows a device according to the invention in a state where no supply of pressurized medium takes place; Fig. 1b shows the device according to Fig. 1a in a state of supply of pressurized medium.
    Fig. 1a schematically shows a device 1 according to the invention. The device is intended to be used for detecting the presence of a cavity 2 in a borehole 3 made in a rock structure 4 in connection with tunnel construction, mining, local excavation and the like according to the method shown in SE 533769. The borehole 3 is intended for receiving a reinforcing means, a rock bolt 5.
    The reinforcing member, the rock bolt 5 comprises a separate measuring tube 6. The measuring tube has a channel 7 which is intended to introduce a pressurized medium 8 into a borehole which is filled or partially filled with hardening casting mass 16. The measuring tube 6 consists of a thin, hollow, longitudinal continuous 2 open tube formed of, for example, dimensionally stable flexible plastic or dimensionally stable flexible rubber with a certain elasticity. By dimensionally stable is meant that the flexible material has the ability to substantially regain its original shape after the force effect on the material has ceased.
    For example, the measuring tube may be made of polyamide or polyurethane or a combination thereof. Such materials are particularly suitable for this purpose, but are not limiting of the invention. The dimensionally stable aspect refers to the transverse stability, when the measuring tube is bent or affected in the transverse direction, the original shape is regained afterwards.
    The measuring tube has a tube wall 9 whose thickness is chosen so that external load of hardening casting compound 16 and the like does not affect the function of the channel 7.
    The measuring pipe 6 with the channel 7 is provided with a channel opening in at least one pipe end, where the channel opening at the surface of the rock structure is intended to introduce a medium into the borehole.
    The diameter of the pipe is substantially smaller than the diameter of the reinforcing member, the rock bolt, but has substantially the same length or is longer than the rock bolt. The length of the pipe thus exceeds the depth of the borehole.
    The measuring tube has an inner end 10 which is adjacent the bottom end 11 of the rock bolt and the bottom 12 of the borehole, and a contact end (not shown) which extends from the borehole.
    The measuring tube is attached to the reinforcing member with one or more fastening devices 13.
    The fastening devices 13 are, for example, pointwise regularly distributed along the length of the rock bolt and the pipe. The fastening device consists, for example, of a cable tie, tape, steel wire or the like.
    The measuring tube 6 with the channel 7 can be attached to the rock bolt 5 in the manufacture of the bolt, in particular if the reinforcing member is a free-standing rock bolt, for example a kiruna bolt.
    If the reinforcing member 5 is a twisted bolt, the length of the bolt is adjusted just before the rock reinforcement is carried out. The bolt is made of metal, for example steel. The measuring tube 6 with the channel is then attached to the rock bolt just before the rock bolt with the measuring tube is inserted into, pressed up into, the borehole filled with hardening molding compound. After the anchoring, the contact end of the measuring tube is available for connection to a measuring equipment (not shown). cavity along the rock bolt, for example such equipment as shown in SE 533769. The drain pipe 6 with the channel 7 is provided with at least one means 14 for supplying a measuring medium 8 to the borehole 3, where the means 14 has a valve function which is activated by pressurization.
    The member 14 is designed as a cut through the pipe wall 9, a section through the side surface of the channel. The member 14, the section, has two abutting section surfaces 15a, 15b. In the unaffected state, the cut surfaces 15a, 15b abut each other and close the cut. No material has been removed from the pipe in the cut surfaces. The measuring tube consists of a plastic material of a dimensionally stable kind, this has the effect that the body, the cut, functions as a valve. The member 14 is thus arranged to be opened when pressurizing the inside of the channel 7.
    When the measuring tube 6 with the channel 7 is supplied to a pressurized medium 8, the member 14, the section, is opened, and the section surfaces 15a, 15b are pushed apart so that an opening, a passage, occurs between the section surfaces, as shown in Fig. Tb. When the pressurized medium is supplied, the duct is connected to the outside of the pipe wall. If there is a cavity on the outside of the measuring tube, the pressurized medium 8 pushes out, and results in a measurable pressure change which indicates the presence of the cavity, a cavity along the rock bolt 5.
    An advantage of the cutting surfaces 15a, 15b being pressed apart is that if there is a thin film of solidified casting mass on the outside of the measuring tube 6, the membrane can be cracked by the pressure in the supplied measuring medium 8. The cut has a considerably larger passage area than, for example, the holes or perforations previously proposed. Therefore, the force and thus the "cracking" ability is greater. When the channel 7 is not supplied with a pressurized medium, the member 14, the cut, is kept closed. The means is thus arranged to be closed in a state when pressurized measuring medium is not supplied. This has the effect that uncured casting material is essentially completely prevented from penetrating through the member and clogging the channel 7. Unlike previously proposed solutions, it is not necessary to cover the opening with a casing, which saves a lot of time and becomes considerably more cost-effective.
    The member 14 thus has a valve function which, in addition, essentially only allows medium transport in one direction. The valve function thus has a kind of non-return valve effect which allows added pressurized measuring medium 8 to be transported out of the channel 7, but prevents uncured casting mass from penetrating into the channel.
    By selecting material and adjusting the number of members 14 and the length of the cuts, it is obtained that the member is only opened when the pressure in the supplied pressure medium 8 exceeds a certain limit value. In this way, a control option is also obtained from the body.
    Preferably, the measuring tube is provided with several means 14, sections, distributed along its length and circumference. Especially in the area near the inner end, the measuring tube is provided with several members along its length, because at the inner end, next to the bottom of the borehole, it is more common for cavities to appear.
    When measuring, the contact end of the measuring tube is connected to a measuring equipment of the type described in sesssrss (shown e; in figure).
    权利要求:
    Claims (9)
    [1]
    Device (1) for detecting the presence of a cavity (2) in a borehole (3) intended for receiving a reinforcing member comprising a measuring tube (6) characterized in that the measuring tube (6) comprises at least one member (14) for supply of a measuring medium to the borehole (3), where the member (14) has a valve function which is activated by pressurization.
    [2]
    Device according to claim 1, wherein the means (14) is arranged to be opened during pressurization.
    [3]
    Device according to claim 1 or 2, wherein the means (14) is arranged to be closed when no pressurized measuring medium is supplied.
    [4]
    Device according to any one of claims 1-3, wherein the means (14) are arranged to allow only medium transport in one direction.
    [5]
    Device according to any one of claims 1-4, wherein the valve function is a non-return valve function.
    [6]
    Device according to one of Claims 1 to 5, in which the means (14) are only opened when the pressure exceeds a certain limit value.
    [7]
    Device according to any one of claims 1-6, wherein the material in the measuring tube (6) comprises a plastic material which is dimensionally stable.
    [8]
    Device according to any one of claims 1-7, wherein the means comprises a section arranged through the pipe wall.
    [9]
    Device according to any one of claims 1-8, wherein the measuring tube is provided with a large number of members distributed along the entire length of the measuring tube.
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    同族专利:
    公开号 | 公开日
    EP2961928A4|2016-09-21|
    EP2961928A1|2016-01-06|
    WO2014133449A1|2014-09-04|
    CL2015002411A1|2016-07-08|
    EP2961928B1|2018-03-28|
    SE537019C2|2014-12-02|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    BE544161A|1955-03-24|
    US3234742A|1962-07-05|1966-02-15|Chester I Williams|Groutable rock bolt assembly and procedure|
    JPS6115239B2|1979-12-18|1986-04-23|Kubota Ltd|
    ZA200405176B|2003-06-30|2005-04-26|Csir|Method and apparatus for testing installation quality in a grouted anchor system|
    SE533769C2|2009-05-06|2010-12-28|Malmfaelten Ab|Method, system, use of systems and reinforcing means in rock reinforcement|
    AU2012203548A1|2011-06-20|2013-01-10|Nikki Gadd|Plug Device and Method|SE538499C2|2014-11-13|2016-08-09|Rock Safety Sweden Ab|Device for rock bolt and method for using the device as well as reinforcing systems including such device.|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350239A|SE537019C2|2013-02-28|2013-02-28|Device for detecting the presence of one or more cavities in a borehole|SE1350239A| SE537019C2|2013-02-28|2013-02-28|Device for detecting the presence of one or more cavities in a borehole|
    PCT/SE2014/050249| WO2014133449A1|2013-02-28|2014-02-28|Device for detecting the presence of one or more cavities in a borehole|
    EP14757785.2A| EP2961928B1|2013-02-28|2014-02-28|Device for detecting the presence of one or more cavities in a borehole|
    CL2015002411A| CL2015002411A1|2013-02-28|2015-08-27|Device for detecting the position of one or more cavities in a perforation|
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