EP1087063B1 - Bohr- und Ankervorrichtung und Verfahren zum Setzen von Verpressankern - Google Patents

Bohr- und Ankervorrichtung und Verfahren zum Setzen von Verpressankern Download PDF

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Publication number
EP1087063B1
EP1087063B1 EP00120588A EP00120588A EP1087063B1 EP 1087063 B1 EP1087063 B1 EP 1087063B1 EP 00120588 A EP00120588 A EP 00120588A EP 00120588 A EP00120588 A EP 00120588A EP 1087063 B1 EP1087063 B1 EP 1087063B1
Authority
EP
European Patent Office
Prior art keywords
drilling
injection
tool
pipe
cement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00120588A
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English (en)
French (fr)
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EP1087063A1 (de
Inventor
Vincenzo Sibilla
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Forasol Sa
Original Assignee
FORASOL S A
FORASOL SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to AT00120588T priority Critical patent/ATE434088T1/de
Priority to DK00120588T priority patent/DK1087063T3/da
Priority to ES00120588T priority patent/ES2327311T3/es
Priority to DE60042385T priority patent/DE60042385D1/de
Priority to EP00120588A priority patent/EP1087063B1/de
Application filed by FORASOL S A, FORASOL SA filed Critical FORASOL S A
Priority to US09/721,328 priority patent/US6588986B1/en
Publication of EP1087063A1 publication Critical patent/EP1087063A1/de
Application granted granted Critical
Publication of EP1087063B1 publication Critical patent/EP1087063B1/de
Priority to CY20091100884T priority patent/CY1109621T1/el
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00—Setting anchoring-bolts
    • E21D20/02—Setting anchoring-bolts with provisions for grouting
    • E21D20/021—Grouting with inorganic components, e.g. cement
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/006—Anchoring-bolts made of cables or wires

Definitions

  • the present invention relates to an anchoring device and a method of setting anchor rods intended to ensure the stability of a structure with respect to a terrain, comprising drilling a hole into an anchoring zone in the field, the introduction of cables and / or other tensile reinforcement in the borehole, and the injection by said borehole of a suspension of cement so as to form a seal body in said area anchor.
  • EP-A-0413676 discloses a method of the above-mentioned type in which a tool is used which has a drilling tool part and has an axial channel extending an injection channel, a valve being disposed at the inlet of said axial channel so as to allow closing said inlet before the injection of a suspension of cement under pressure by the central channel and said axial channel.
  • the document EP 0 770 734 describes a method in which drilling is carried out by means of a tube provided at its front end with a drilling tool and injection, said tube forming a cement injection channel and said tool having at least two lateral nozzles oriented in opposite directions, and having a drill bit portion having an axial channel extending said injection channel, a valve being disposed between the inlet of said axial channel and said nozzles, so as to allow said inlet to be closed prior to the injection of the cement suspension under pressure, that said cement suspension is injected into the surrounding ground through said nozzles, radially to said tube, with a pressure greater than about 40 MPa (400 bar), by rotating the tube about its axis and back, continuously or discontinuously, over a specified length of seal, which is then stops the injection and that the tube is raised entirely, said cables and / or other tensile armatures being introduced into the borehole, before the hardening of the cement, into the sealing body in formation.
  • This process makes it possible to considerably shorten the time required for setting up the tie rods and to achieve a good anchorage.
  • the aim of the invention is to provide an anchoring device and a method for placing improved anchor rods, in particular a device and a method, respectively, of the aforementioned type where the anchoring is further improved and the setting operation in place of anchor anchors simplified and faster.
  • the method according to the invention comprises the operation of drilling using a drill string. as in claim 1. attached to one or more tie-rods or other tie-bars, that said cement slurry is injected into the surrounding terrain and around the tie-bars and the drill bit, and that the tube entirely leaving the drill bit in the sealing body.
  • the drilling and anchoring device comprises a column comprising a drill pipe, a drilling tool mounted at the end of the pipe and one or more cables and / or other tie rods, as in claim 3.
  • the injection tool is preferably provided with at least two lateral nozzles oriented in opposite directions and at least one end nozzle oriented obliquely towards the central axis of the tube in which the cables extend and / or other tensile frames.
  • the drilling tool has a coupling portion which is inserted into the axial channel of the tube axially separable.
  • pressurized water is fed through an axial channel to the drill bit.
  • the axial channel may be formed by an inner tube coaxial with the drill pipe.
  • the inner tube may be provided with a valve, for example in its upper part, to control the supply of water under pressure to the drill bit during the drilling operation and during the operation of the ascent of the drilling column after formation of the sealing body.
  • the space between the drill pipe and the inner pipe can form the cement injection channel.
  • the end nozzle is inclined at an acute angle with respect to the axial direction, for example at 30 °, so that the cement suspension jet exiting this nozzle applies a force component in the axial direction on the nozzle. drilling tool. This allows separation of the drill bit from the drill pipe during formation of the seal body. On the other hand, this nozzle ensures that the cables and / or other tie rods are completely embedded in the sealing body.
  • the device and the method according to the invention thus make it possible to achieve a very good anchoring with very few operations and a great speed.
  • the invention also avoids problems that may be related to the reintroduction of draft reinforcement in the borehole of conventional methods.
  • the attachment of the drill bit to the end of the tie frames also improves the retention of these reinforcements in the seal body.
  • a work to be anchored 1 is supported on a part of ground 2 and is stabilized by a tie rod, designated as a whole by the reference 3.
  • This tie rod comprises, in known manner, for example pulling cables 4 constituted by strands, one end of which is fixed in a pulling head 5 resting on the work 1.
  • the pulling cables 4 are arranged in a borehole 6 over a certain free length and are secured to a sealing body 7 in the form of a bulb formed around the lower part of the borehole by cement injection under high pressure in the surrounding terrain.
  • the Fig. 1 only gives a schematic representation of an example of a tie rod, the anchoring technique being well known in itself.
  • the present invention consists in using, for example, a drill string comprising a drill pipe 8 provided with an injection tool 9 coupled to a drill bit 12 according to the invention.
  • Fig. 2 for drilling, first, the hole 6 over a length corresponding to the desired free length and the length of sealing which is basically that of bulb 7 of the Fig. 1 .
  • the drilling tool 12 is attached to the ends of the pulling cables 4, for example by welds 17 or by mechanical clamping means such as keys.
  • the drilling tool 12 and the pulling cables 4 are threaded into the central channel 10 of an inner tube 21 coaxial with the drill pipe 8, before the drilling operation.
  • the drill pipe 8 has a length, without separations, at least equivalent to the length of the tie rods.
  • the drilling tool 12 is coupled to the injection tool 9, axially separable, by complementary teeth 18, or other known mechanical means allowing the rotary drive of the drill bit 12 by the injection tool 9.
  • the drilling tool 12 preferably comprises a tube portion 19 which is inserted into the central channel 10 to allow its radial positioning and retention with respect to the injection tool 9.
  • the drilling operation is accompanied by an injection of water or a mixture of water and air through the central channel 10 and its extension 11 in the injection tool.
  • the water is injected into the borehole by one or more channels extending axially through the drill bit.
  • a suspension of cement is injected into the ground at a very high pressure, for example 450 bar, through one or more inclined end nozzles 16 and two or more lateral nozzles 13, 14 of small diameter, ie 1.5 to 2 mm, communicating with one or more axial channels 15 in the injection tool 9.
  • the injection channels 15 are connected to an injection channel 15 'formed between the wall of the tube 8 and the wall of the inner tube 21.
  • a valve (not shown) is arranged in the upper part of the drill pipe to close the central channel 10 during the injection of cement.
  • the tube is rotated about its axis and is slowly withdrawn, so that the jets produced by the nozzles 13 and 14 in opposite radial directions penetrate the ground creating a substantially cylindrical bulb, as shown in FIG. Fig. 1 .
  • the injection pressure is preferably between 500-800 bar.
  • the cement injection pump can be equipped with a solenoid valve to trigger the pump during overpressure.
  • the solenoid valve does not have time to trigger sufficiently early to avoid crushing the inner tube.
  • the drill string is provided with a mechanical fuse portion 22 comprising a portion of the drill pipe 8 'and an inner tube portion 21' forming between them an injection channel 15 '.
  • the mechanical fuse portion 22 is disposed near the injection head 23, so that in case of deformation, the fuse can be easily exchanged without leaving the drill string of the hole before the end of the operation. cement injection.
  • the inner tube portion 21 'of the fuse portion 22 has a smaller wall thickness than the inner tube 21 of the drill string or other weakening, so that the inner tube portion 21' crushes more easily. the inner tube 21. The crushing of the portion of the inner tube 21 causes the pressure to escape into the central channel 10, avoiding damage to the main inner tube 21.
  • the inclined end nozzle 16 projects a jet against the drill bit 12 so that the tool is pushed towards the bottom of the borehole for that we go back the injection tool 9, thus separating the drill tool from the injection tool.
  • the end nozzle being inclined towards the central channel 10, it also ensures a very good filling of the borehole by the injected cement, so that the pulling cables are completely embedded in the sealing body.
  • the drilling tool attached to the ends of the tie rods improves their anchorage.
  • the injection tool is extracted from the borehole.
  • the present invention makes it possible in any case of application to shorten and simplify the anchoring anchor installation procedure, while providing a reliable anchorage, well controlled and high strength in all types of terrain.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Piles And Underground Anchors (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Dowels (AREA)

Claims (9)

  1. Verfahren zur Platzierung von Felsankern, nach dem die Bohrung mit einem Bohrrohr (8) durchgeführt wird, das an seinem Frontende mit einem Einspritzwerkzeug (9) und einem an das Einspritzwerkzeug gekoppelten Bohrwerkzeug (12) ausgestattet ist, wobei dieses Bohrrohr einem Zementeinspritzkanal (15, 15') hat und das Einspritzwerkzeug mindestens eine oder mehrere Düsen (13, 16, 16) aufweist, die das Einspritzen einer Zementsuspension unter Druck in das umgebende Gelände erlaubt, um einen Zementkörper zu bilden, wobei das Bohrwerkzeug an einem oder mehreren Ankerkabeln (4) oder anderen Ankerarmaturen befestigt ist, wobei die Zementsuspension in das umgebende Gelände und um die Ankerarmaturen und das Bohrwerkzeug eingespritzt wird, wobei das Bohrrohr voll und ganz herausgezogen wird, wobei das Bohrwerkzeug im Zementkörper verbleibt, dadurch gekennzeichnet, dass die Zuführung der besagten Zementsuspension zum Einspritzwerkzeug über den besagten Einspritzkanal erfolgt, der zwischen einer Innenwand des besagten Bohrrohrs und einer Außenwand eines Innenrohrs (21, 21') ausgebildet ist, das koaxial zum besagten Bohrrohr angeordnet ist.
  2. Verfahren zur Platzierung von Felsankern nach Anspruch 1, dadurch gekennzeichnet, dass das Bohrrohr (8, 8') beim Herausziehen um seine Mittelachse gedreht wird.
  3. Bohr- und Verankerungsvorrichtung, ein Bohrrohr (8), ein am Ende des Bohrrohrs montiertes Bohrwerkzeug (12) und ein oder mehrere Kabel (4) und / oder andere Ankerarmaturen umfassend, die am Bohrwerkzeug befestigt sind, so dass das Bohrwerkzeug im Zementkörper (7) verbleibt, der durch Zementeinspritzung in das umgebende Gelände eines Bohrlochs gebildet wird, dadurch gekennzeichnet, dass sie weiterhin ein Innenrohr (21, 21') koaxial zum Bohrrohr umfasst, die miteinander einen Zementeinspritzkanal bilden, wobei das Innenrohr einen zentralen Kanal (10) bildet, in welchem sich das Kabel und / oder andere Ankerarmaturen erstrecken.
  4. Bohr- und Verankerungsvorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass sie einen mechanischen Sicherungsabschnitt (22) umfasst, der mit einem Bohrrohrabschnitt (8') und einem mit dem Bohrrohrabschnitt koaxialen Innenrohrabschnitt (21') ausgestattet ist, wobei der Innenrohrabschnitt (21') des Sicherungsabschnitts eine geringere mechanische Druckfestigkeit als das Innenrohr (21) hat.
  5. Bohr- und Verankerungsvorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass der mechanische Sicherungsabschnitt (22) in der Nähe des Einspritzkopfs (23) der Vorrichtung angeordnet ist.
  6. Bohr- und Verankerungsvorrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass das Bohrwerkzeug (12) axial trennbar an ein Einspritzwerkzeug gekoppelt ist, wobei das Einspritzwerkzeug Zementeinspritzdüsen (13, 14, 16) umfasst.
  7. Bohr- und Verankerungsvorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass mindestens zwei der besagten Zementeinspritzdüsen im Einspritzwerkzeug radial gegenüberliegend angeordnet sind.
  8. Bohr- und Verankerungsvorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die besagten radial gegenüberliegend angeordneten Einspritzdüsen derart ausgerichtet sind, dass der Zement in einer zur Mittelachse des Bohrrohrs im Wesentlichen rechtwinkligen Richtung eingespritzt wird.
  9. Bohr- und Verankerungsvorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, dass mindestens eine der Einspritzdüsen (16) gegen das Bohrwerkzeug gerichtet ist, um die Trennung des Einspritzwerkzeugs vom Bohrwerkzeug während der Zementeinspritzung zu erleichtern.
EP00120588A 1999-09-23 2000-09-20 Bohr- und Ankervorrichtung und Verfahren zum Setzen von Verpressankern Expired - Lifetime EP1087063B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DK00120588T DK1087063T3 (da) 1999-09-23 2000-09-20 Indretning til boring og forankring samt fremgangsmåde til installering af trækankre
ES00120588T ES2327311T3 (es) 1999-09-23 2000-09-20 Dispositivo de perforacion y de anclaje y procedimiento de colocacion de tirantes de anclaje.
DE60042385T DE60042385D1 (de) 1999-09-23 2000-09-20 Bohr- und Ankervorrichtung und Verfahren zum Setzen von Verpressankern
EP00120588A EP1087063B1 (de) 1999-09-23 2000-09-20 Bohr- und Ankervorrichtung und Verfahren zum Setzen von Verpressankern
AT00120588T ATE434088T1 (de) 1999-09-23 2000-09-20 Bohr- und ankervorrichtung und verfahren zum setzen von verpressankern
US09/721,328 US6588986B1 (en) 1999-09-23 2000-11-22 Device for drilling and anchoring and process for placing grout anchors
CY20091100884T CY1109621T1 (el) 1999-09-23 2009-08-20 Διαταξη διατρησης και αγκυρωσης και μεθοδος τοποθετησης ραβδων αγκυρωσης

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99810852 1999-09-23
EP99810852 1999-09-23
EP00120588A EP1087063B1 (de) 1999-09-23 2000-09-20 Bohr- und Ankervorrichtung und Verfahren zum Setzen von Verpressankern
US09/721,328 US6588986B1 (en) 1999-09-23 2000-11-22 Device for drilling and anchoring and process for placing grout anchors

Publications (2)

Publication Number Publication Date
EP1087063A1 EP1087063A1 (de) 2001-03-28
EP1087063B1 true EP1087063B1 (de) 2009-06-17

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EP00120588A Expired - Lifetime EP1087063B1 (de) 1999-09-23 2000-09-20 Bohr- und Ankervorrichtung und Verfahren zum Setzen von Verpressankern

Country Status (6)

Country Link
US (1) US6588986B1 (de)
EP (1) EP1087063B1 (de)
AT (1) ATE434088T1 (de)
DE (1) DE60042385D1 (de)
DK (1) DK1087063T3 (de)
ES (1) ES2327311T3 (de)

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Publication number Priority date Publication date Assignee Title
ATE434088T1 (de) * 1999-09-23 2009-07-15 Forasol S A Bohr- und ankervorrichtung und verfahren zum setzen von verpressankern
US6672806B2 (en) 2000-11-22 2004-01-06 Forasol International Sa Device for drilling and anchoring and process for placing grout anchors
AT505959B1 (de) * 2004-03-23 2011-06-15 Alwag Tunnelausbau Gmbh Verfahren und vorrichtung zum bohren insbesondere schlag- oder drehschlagbohren eines loches in boden- oder gesteinsmaterial und zum ausbilden einer verankerung
US7565779B2 (en) 2005-02-25 2009-07-28 W. R. Grace & Co.-Conn. Device for in-situ barrier
US7584581B2 (en) 2005-02-25 2009-09-08 Brian Iske Device for post-installation in-situ barrier creation and method of use thereof
NL1030624C2 (nl) * 2005-12-08 2007-06-12 Van Leeuwen Harmelen Bv Geb Werkwijze voor het inbrengen van een trekanker in de grond.
DE102007005540B4 (de) * 2006-02-24 2015-04-23 Friedr. Ischebeck Gmbh Verfahren und Injektionsanker mit fixiertem Statikmischer
US20090284712A1 (en) * 2008-05-14 2009-11-19 Brooks Phillip E Eyeglass support device
CN102051879B (zh) * 2010-11-09 2012-07-04 中国水电顾问集团华东勘测设计研究院 土层锚杆施工工艺
CZ303418B6 (cs) * 2010-12-22 2012-09-05 Vysoká škola bánská-Technická univerzita Ostrava Flexibilní vícepramenný svorník se staticky nezávisle cinnými prameny
DE102011078767A1 (de) * 2011-07-07 2013-01-10 Hilti Aktiengesellschaft Litzenanker
CN104532836B (zh) * 2014-12-24 2016-06-01 中科院广州化灌工程有限公司 一种成孔、安装、注浆三合一的锚索施工装置
CN105370305B (zh) * 2015-11-11 2018-02-16 中国煤炭科工集团太原研究院有限公司 一种锚固剂药卷自动分装、喷射装置
AU2018265269B2 (en) 2017-05-10 2024-03-28 Gcp Applied Technologies Inc. In-situ barrier device with internal injection conduit
CN114991141B (zh) * 2022-06-30 2024-04-09 广东志创宏建筑工程有限公司 一种预应力锚索结构及预应力锚索施工方法

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Also Published As

Publication number Publication date
ATE434088T1 (de) 2009-07-15
DE60042385D1 (de) 2009-07-30
US6588986B1 (en) 2003-07-08
DK1087063T3 (da) 2009-08-03
ES2327311T3 (es) 2009-10-28
EP1087063A1 (de) 2001-03-28

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