EP0800615A1 - Rod for an anchor inserted by drilling and injection grouting - Google Patents

Rod for an anchor inserted by drilling and injection grouting

Info

Publication number
EP0800615A1
EP0800615A1 EP96900026A EP96900026A EP0800615A1 EP 0800615 A1 EP0800615 A1 EP 0800615A1 EP 96900026 A EP96900026 A EP 96900026A EP 96900026 A EP96900026 A EP 96900026A EP 0800615 A1 EP0800615 A1 EP 0800615A1
Authority
EP
European Patent Office
Prior art keywords
thread
anchor rod
rod according
anchor
drilling
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.)
Granted
Application number
EP96900026A
Other languages
German (de)
French (fr)
Other versions
EP0800615B1 (en
Inventor
Johann Helbling
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.)
H Weidmann AG
Original Assignee
H Weidmann AG
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
Application filed by H Weidmann AG filed Critical H Weidmann AG
Publication of EP0800615A1 publication Critical patent/EP0800615A1/en
Application granted granted Critical
Publication of EP0800615B1 publication Critical patent/EP0800615B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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
    • E21D21/0053—Anchoring-bolts in the form of lost drilling rods
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH 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

  • anchors are often used to secure walls, the roof or the tunnel face.
  • holes are first drilled using a hammer or rotary drilling machine with a drill rod and then the anchors are set, which can be designed, for example, as adhesive anchors.
  • drilling injection anchors have been proposed (for example EP-B-355 379). They consist of a steel tube that carries a drill bit at the front and can be connected to the drill at the rear. After drilling, the drill is uncoupled and injection material is pressed through the pipe. A clamping nut is then screwed onto the protruding pipe end, which presses a pressure plate against the tunnel wall.
  • a disadvantage of these drilling injection anchors is their susceptibility to corrosion, and if the cavity protection is only intended to have a temporary effect, for example on a tunnel face or in coal mining, ie the secured wall has to be removed later, the massive steel pipes of these injection anchors present difficulties when they are subsequently dismantled.
  • the object of the present invention is to remedy the above disadvantages. This object is achieved by the combination of features of the claims.
  • Anchor rods made of fiber-reinforced plastic are known per se (e.g. US-A-4 664 573 and EP-A-94 908). These known anchor rods have unidirectionally oriented fibers in the longitudinal direction and therefore have only a low torsional strength. They are therefore not suitable as drilling injection anchors.
  • the tube also has helically wound fibers in addition to the longitudinal fibers, the torsional strength of the tube is higher than that of known plastics. fabric anchor rods much larger. The torques required for drilling can therefore be transmitted via the anchor rod. Surprisingly, it has been shown that the fiber-reinforced plastic rod also transfers the impacts of the impact drilling machine to the drill bit with only slight losses. So far, this was not considered possible because the experts assumed that the plastic would dampen the blows too much.
  • the anchor rod according to the invention is corrosion-resistant and machinable, so that it can be used as a drilling injection anchor for permanent and temporary fastening without any problems. When a fixed wall is later dismantled, it is easily machined.
  • the anchor rod according to the invention is also significantly lighter than the known steel injection anchors with the same tensile strength. This makes handling, storage and transportation easier.
  • FIG. 1 shows an axial section through part of an anchor rod
  • FIG. 2 shows a second embodiment
  • FIG. 3 shows an anchor rod with sleeve and drill bit
  • FIG. 4 shows a third embodiment.
  • an anchor tube 1 consists of a tubular body 2 and an external round thread 3 molded therein shown with axial thread root 4 and thread comb 5 in axial section.
  • the tubular body 2 consists of a fiber-reinforced thermoset. It has both longitudinal fibers 6 and helically wound fibers 7, the direction of which is opposed to the direction of the thread 3. As a result, the tubular body 2 is radially compressed by the fibers 7 when a torque 3 acting in the attractive sense of the thread 3 is transmitted. This also increases the strength of the bar against torsion and pressure.
  • the fibers 7 are preferably arranged predominantly in the outer region of the tube 1. In the embodiment according to FIG.
  • the thread 3 is molded into the tubular body by pressing by means of a shaped body before the thermosetting of the tubular body 2 is completely hardened, the material displaced from the root of the thread 4 filling the mold cavity for the thread comb. This ensures optimal thread strength.
  • the molded body is a multi-part sleeve with centering means in the circumferential direction and can consist, for example, of a thermoplastic.
  • the thread 3 can also be cut into the tubular body 2.
  • the other end of the anchor tube 1 is identical.
  • FIG. 2 shows a variant in which the thread 3 is formed on a sleeve 8 cast or glued onto the tubular body 2.
  • the sleeve 8 can consist of a fiber-reinforced thermoset or of a metallic material.
  • Figure 3 shows the structure of an injection drill anchor.
  • a drill bit 12 with a Internal thread 13 screwed on On the one thread 3 of the tube 1, a drill bit 12 with a Internal thread 13 screwed on.
  • the crown 12 lies with a shoulder 14 on the end face 9 of the tube 1 and has rinsing and injection channels 15 which communicate with the axial bore 10 of the tube 1.
  • the crown 12 has, for example, chisel-like cutting edges 16 on the end face. However, depending on the rock to be drilled, the crown 12 can also be designed differently.
  • Half of a sleeve 17 with a corresponding internal thread 18 is screwed onto the other thread 3.
  • a threaded pin of a drill is screwed into the projecting end of the sleeve 13.
  • the drilling process can then be started, a flushing agent, for example air or water, being pressed through the bore 10 and the channels 15.
  • a flushing agent for example air or water
  • the threaded pin of the drill is unscrewed from the sleeve 17 when a predetermined drilling depth is reached, the drill is retracted and a second tube is screwed into the sleeve 17.
  • a further sleeve 17 is screwed on and the drilling process is continued.
  • the drilling machine and the outermost sleeve 17 are removed. Injection material is pressed into the borehole via the borehole 10. Finally, an anchor plate is pushed over the projecting end of the anchor tube 1 and a nut is screwed onto the thread 3 and tightened against the anchor plate.
  • FIG. 1 A further embodiment of the thread 3 is shown in FIG. If the tubular body is not yet fully hardened 2 a fiber sliver is wound on the end of the thread with the pitch of the thread 3 so that the thread root is somewhat constricted.
  • Two half-shells 20 of a thin-walled sleeve 21 made of steel are pressed radially onto this preformed thread.
  • the thread 3 is pressed into the half-shells 20.
  • the two half-shells 20 collide in a common axial plane and engage with one another along the dividing line with a plurality of projections 22 and matching incisions 23.
  • the two half-shells 20 are welded along the dividing line at several points, for example using the tungsten inert gas method.
  • a sleeve 24 made of steel with a flange 25 abutting the end face 9 is inserted.
  • This embodiment has the advantages, in particular, that the steel sleeve 21 is connected to the tubular body 2 in a form-fitting manner in the axial direction and that the thread 3 tends to seize considerably less than a thread formed in plastic.
  • the flange 25 serves the same purpose.
  • the sleeve 24 supports the tubular body 3 against radial compression. With the design according to FIG. 4, it is therefore easier to detach the tube for extending the anchor tube 1 from the threaded pin of the drilling machine.

Landscapes

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

Abstract

The anchor rod proposed consists of a fibre-reinforced plastic tube (1) containing both longitudinally oriented and helically wound fibres (6, 7) and fitted at each end with a thread (3). This design enables the turning forces necessary for drilling to be transmitted through the rod. The rod is corrosion-resistant and can be machined, thus allowing it to be inserted by drilling and subseqent injection grouting for both permanent and temporary reinforcement of the walls of hollow structures.

Description

Ankerstab für einen Bohr-Injektionsanker Anchor rod for a drill injection anchor
Im Untertagebau, zum Beispiel im Tunnelbau oder im Bergbau, werden vielfach Anker zur Sicherung von Wänden, der Firste oder der Tunnelbrust verwendet. Ueblicherweise werden dazu mittels einer Schlag- oder Drehbohrmaschine mit einem Bohrgestänge zu¬ nächst Löcher gebohrt und anschliessend die Anker gesetzt, wel¬ che zum Beispiel als Klebeanker ausgebildet sein können.In underground construction, for example in tunnel construction or in mining, anchors are often used to secure walls, the roof or the tunnel face. Usually, holes are first drilled using a hammer or rotary drilling machine with a drill rod and then the anchors are set, which can be designed, for example, as adhesive anchors.
Schwierigkeiten bereitet dieses Vorgehen, wenn in weichem Ge¬ stein gebohrt wird, das leicht einbricht. Beim Herausziehen des Bohrgestänges kann die Bohrlochwand einbrechen, sodass der An- ker anschliessend nicht mehr gesetzt werden kann. Um dieser Schwierigkeit zu begegnen, sind Bohr-Injektionsanker vorge¬ schlagen worden (z.B. EP-B-355 379). Sie bestehen aus einem Stahlrohr, das vorn eine Bohrkrone trägt und hinten mit der Bohrmaschine verbunden werden kann. Nach dem Bohren wird die Bohrmaschine abgekuppelt und durch das Rohr Injektionsmaterial eingepresst. Anschliessend wird auf das vorstehende Rohrende eine Spannmutter aufgeschraubt, welche eine Druckplatte gegen die Tunnelwand presst. Ein Nachteil dieser Bohr-Injektionsanker ist ihre Korrosionsanfälligkeit, und falls die Hohlraumsiche¬ rung nur temporär wirken soll, z.B. an einer Tunnelbrust oder im Kohlebergbau, die gesicherte Wand also später abzubauen ist, bereiten die massiven Stahlrohre dieser Injektionsanker beim späteren Abbau Schwierigkeiten.This procedure presents difficulties when drilling in soft rock that breaks easily. When pulling out the drill pipe, the borehole wall can collapse, so that the ker can then no longer be placed. In order to counter this difficulty, drilling injection anchors have been proposed (for example EP-B-355 379). They consist of a steel tube that carries a drill bit at the front and can be connected to the drill at the rear. After drilling, the drill is uncoupled and injection material is pressed through the pipe. A clamping nut is then screwed onto the protruding pipe end, which presses a pressure plate against the tunnel wall. A disadvantage of these drilling injection anchors is their susceptibility to corrosion, and if the cavity protection is only intended to have a temporary effect, for example on a tunnel face or in coal mining, ie the secured wall has to be removed later, the massive steel pipes of these injection anchors present difficulties when they are subsequently dismantled.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die obi¬ gen Nachteile zu beheben. Diese Aufgabe wird durch die Merk¬ malskombination der Ansprüche gelöst.The object of the present invention is to remedy the above disadvantages. This object is achieved by the combination of features of the claims.
Ankerstäbe aus faserverstärktem Kunststoff sind an sich bekannt (z.B. US-A-4 664 573 und EP-A-94 908). Diese bekannten Anker¬ stäbe haben unidirektional in Längsrichtung orientierte Fasern und weisen deshalb nur eine geringe Torsionsfestigkeit auf. Als Bohr-Injektionsanker sind sie daher nicht geeignet.Anchor rods made of fiber-reinforced plastic are known per se (e.g. US-A-4 664 573 and EP-A-94 908). These known anchor rods have unidirectionally oriented fibers in the longitudinal direction and therefore have only a low torsional strength. They are therefore not suitable as drilling injection anchors.
Weil bei der erfindungsgemässen Ausbildung das Rohr nebst längsgerichteten auch wendeiförmig gewickelte Fasern hat, ist die Torsionsfestigkeit des Rohres gegenüber bekannten Kunst- stoff-Ankerstäben wesentlich grösser. Deshalb können die zum Bohren erforderlichen Drehmomente über den Ankerstab übertragen werden. Ueberraschenderweise hat sich gezeigt, dass der faser¬ armierte Kunststoffstab auch die Schläge der Schlag-Bohrma¬ schine nur mit geringen Verlusten auf die Bohrkrone überträgt. Dies wurde bisher nicht für möglich gehalten, weil die Fachwelt davon ausging, der Kunststoff dämpfe die Schläge zu stark ab.Because, in the embodiment according to the invention, the tube also has helically wound fibers in addition to the longitudinal fibers, the torsional strength of the tube is higher than that of known plastics. fabric anchor rods much larger. The torques required for drilling can therefore be transmitted via the anchor rod. Surprisingly, it has been shown that the fiber-reinforced plastic rod also transfers the impacts of the impact drilling machine to the drill bit with only slight losses. So far, this was not considered possible because the experts assumed that the plastic would dampen the blows too much.
Der erfindungsge ässe Ankerstab ist korrosionsfest und zer¬ spanbar, sodass er als Bohr-Injektionsanker zur permanenten und temporären Befestigung problemlos eingesetzt werden kann. Beim späteren Abbau einer befestigten Wand wird er problemlos zer¬ spant. Der erfindungsgemässe Ankerstab ist bei gleicher Zugfe¬ stigkeit ausserdem bedeutend leichter als die bekannten Stahl- Injektionsanker. Dadurch wird die Handhabung, die Lagerung und der Transport erleichtert.The anchor rod according to the invention is corrosion-resistant and machinable, so that it can be used as a drilling injection anchor for permanent and temporary fastening without any problems. When a fixed wall is later dismantled, it is easily machined. The anchor rod according to the invention is also significantly lighter than the known steel injection anchors with the same tensile strength. This makes handling, storage and transportation easier.
Nachfolgend werden Ausführungsbeispiele der Erfindung anhand der Zeichnung erläutert. Darin zeigt:Exemplary embodiments of the invention are explained below with reference to the drawing. It shows:
Figur 1 Einen Axialschnitt durch einen Teil eines Ankersta¬ bes, Figur 2 eine zweite Ausführungsform, Figur 3 einen Ankerstab mit Hülse und Bohrkrone, und Figur 4 eine dritte Ausführungsform.1 shows an axial section through part of an anchor rod, FIG. 2 shows a second embodiment, FIG. 3 shows an anchor rod with sleeve and drill bit, and FIG. 4 shows a third embodiment.
In Figur 1 ist ein Ende eines Ankerrohres 1 bestehend aus einem Rohrkörper 2 und einem darin eingeformten Aussen-Rundgewinde 3 mit im Axialschnitt rundem Gewindegrund 4 und Gewindekamm 5 dargestellt. Der Rohrkörper 2 besteht aus einem faserarmierten Duroplast. Er hat sowohl längsgerichtete Fasern 6 als auch wen¬ deiförmig gewickelte Fasern 7, deren Steigungssinn entgegen¬ gesetzt ist zum Steigungssinn des Gewindes 3. Dadurch wird der Rohrkörper 2 durch die Fasern 7 beim Üebertragen eines im anziehenden Sinne des Gewindes 3 wirkenden Drehmomentes radial komprimiert. Dies erhöht zusätzlich die Festigkeit des Stabes auf Torsion und Druck. Die Fasern 7 sind vorzugsweise überwie¬ gend im äusseren Bereich des Rohres 1 angeordnet. Das Gewinde 3 ist bei der Ausführungsform nach Figur 1 in den Rohrkörper durch Pressen mittels eines Formkörpers vor dem fertigen Aus¬ härten des Duroplasten des Rohrkörpers 2 eingeformt, wobei das aus dem Gewindegrund 4 verdrängte Material den Formhohlraum für den Gewindekamm füllt. Dadurch wird eine optimale Festigkeit des Gewindes erzielt. Der Formkörper ist eine in Umfangsrich- tung mehrteilige Hülse mit Zentriermitteln und kann z.B. aus einem Thermoplasten bestehen. Alternativ kann das Gewinde 3 jedoch auch in den Rohrkörper 2 geschnitten sein. Das andere Ende des Ankerrohres 1 ist identisch ausgebildet.In FIG. 1, one end of an anchor tube 1 consists of a tubular body 2 and an external round thread 3 molded therein shown with axial thread root 4 and thread comb 5 in axial section. The tubular body 2 consists of a fiber-reinforced thermoset. It has both longitudinal fibers 6 and helically wound fibers 7, the direction of which is opposed to the direction of the thread 3. As a result, the tubular body 2 is radially compressed by the fibers 7 when a torque 3 acting in the attractive sense of the thread 3 is transmitted. This also increases the strength of the bar against torsion and pressure. The fibers 7 are preferably arranged predominantly in the outer region of the tube 1. In the embodiment according to FIG. 1, the thread 3 is molded into the tubular body by pressing by means of a shaped body before the thermosetting of the tubular body 2 is completely hardened, the material displaced from the root of the thread 4 filling the mold cavity for the thread comb. This ensures optimal thread strength. The molded body is a multi-part sleeve with centering means in the circumferential direction and can consist, for example, of a thermoplastic. Alternatively, the thread 3 can also be cut into the tubular body 2. The other end of the anchor tube 1 is identical.
Figur 2 zeigt eine Variante, bei der das Gewinde 3 an einer auf den Rohrkörper 2 aufgegossenen oder aufgeklebten Hülse 8 ge¬ formt ist. Die Hülse 8 kann aus einem faserarmierten Duroplast oder aus einem metallischen Werkstoff bestehen.FIG. 2 shows a variant in which the thread 3 is formed on a sleeve 8 cast or glued onto the tubular body 2. The sleeve 8 can consist of a fiber-reinforced thermoset or of a metallic material.
Figur 3 zeigt den Aufbau eines Injektions-Bohrankers. Auf das eine Gewinde 3 des Rohres 1 wird eine Bohrkrone 12 mit einem Innengewinde 13 aufgeschraubt. Die Krone 12 liegt mit einer Schulter 14 an der Stirnfläche 9 des Rohres 1 an und hat Spül- und Injektionskanäle 15, die mit der axialen Bohrung 10 des Rohres 1 kommunizieren. An der Stirnfläche hat die Krone 12 z.B. eisselartige Schneiden 16. Je nach dem zu bohrenden Ge¬ stein kann die Krone 12 jedoch auch anders ausgebildet sein. Auf das andere Gewinde 3 ist eine Hülse 17 mit einem ent¬ sprechenden Innengewinde 18 zur Hälfte aufgeschraubt. In das vorstehende Ende der Hülse 13 wird ein Gewindezapfen einer Bohrmaschine eingeschraubt. Hierauf kann der Bohrvorgang begon¬ nen werden, wobei durch die Bohrung 10 und die Kanäle 15 ein Spülmittel, z.B. Luft oder Wasser, gepresst wird. Wenn der An¬ ker länger sein soll als ein Ankerrohr 1 , so wird bei Erreichen einer vorgegebenen Bohrtiefe der Gewindezapfen der Bohrmaschine aus der Hülse 17 ausgeschraubt, die Bohrmaschine zurückgefahren und ein zweites Rohr in die Hülse 17 eingeschraubt. Auf deren anderes Ende wird eine weitere Hülse 17 aufgeschraubt und der Bohrvorgang fortgesetzt.Figure 3 shows the structure of an injection drill anchor. On the one thread 3 of the tube 1, a drill bit 12 with a Internal thread 13 screwed on. The crown 12 lies with a shoulder 14 on the end face 9 of the tube 1 and has rinsing and injection channels 15 which communicate with the axial bore 10 of the tube 1. The crown 12 has, for example, chisel-like cutting edges 16 on the end face. However, depending on the rock to be drilled, the crown 12 can also be designed differently. Half of a sleeve 17 with a corresponding internal thread 18 is screwed onto the other thread 3. A threaded pin of a drill is screwed into the projecting end of the sleeve 13. The drilling process can then be started, a flushing agent, for example air or water, being pressed through the bore 10 and the channels 15. If the anchor is to be longer than an anchor tube 1, the threaded pin of the drill is unscrewed from the sleeve 17 when a predetermined drilling depth is reached, the drill is retracted and a second tube is screwed into the sleeve 17. At the other end, a further sleeve 17 is screwed on and the drilling process is continued.
Wenn die erforderliche Bohrtiefe erreicht ist, wird die Bohrma¬ schine und die äusserste Hülse 17 entfernt. Ueber die Bohrung 10 wird Injektionsmaterial ins Bohrloch eingepresst. Schliess- lich wird über das vorstehende Ende des Ankerrohres 1 eine An¬ kerplatte geschoben und eine Mutter auf das Gewinde 3 aufge¬ schraubt und gegen die Ankerplatte festgezogen.When the required drilling depth has been reached, the drilling machine and the outermost sleeve 17 are removed. Injection material is pressed into the borehole via the borehole 10. Finally, an anchor plate is pushed over the projecting end of the anchor tube 1 and a nut is screwed onto the thread 3 and tightened against the anchor plate.
In Figur 4 ist eine weitere Ausführungsform des Gewindes 3 dargestellt. Bei noch nicht fertig ausgehärtetem Rohrkörper 2 wird auf dessen Ende ein Faserband mit der Steigung des Gewin¬ des 3 so aufgewickelt, dass der Gewindegrund etwas eingeschnürt wird. Auf dieses vorgeformte Gewinde werden zwei Halbschalen 20 einer dünnwandigen Hülse 21 aus Stahl radial aufgepresst. Das Gewinde 3 ist in den Halbschalen 20 eingepresst. Die beiden Halbschalen 20 stossen in einer gemeinsamen Axialebene zusammen und greifen mit mehreren Vorsprüngen 22 und passenden Ein¬ schnitten 23 längs der Trennlinie ineinander. Die beiden Halb¬ schalen 20 sind längs der Trennlinie an mehreren Punkten ver- schweisst, z.B. nach dem Wolfram Inertgas Verfahren. In das Ende der Bohrung 10 ist eine Hülse 24 aus Stahl mit einem an der Stirnfläche 9 anliegenden Flansch 25 eingesetzt.A further embodiment of the thread 3 is shown in FIG. If the tubular body is not yet fully hardened 2 a fiber sliver is wound on the end of the thread with the pitch of the thread 3 so that the thread root is somewhat constricted. Two half-shells 20 of a thin-walled sleeve 21 made of steel are pressed radially onto this preformed thread. The thread 3 is pressed into the half-shells 20. The two half-shells 20 collide in a common axial plane and engage with one another along the dividing line with a plurality of projections 22 and matching incisions 23. The two half-shells 20 are welded along the dividing line at several points, for example using the tungsten inert gas method. In the end of the bore 10, a sleeve 24 made of steel with a flange 25 abutting the end face 9 is inserted.
Diese Ausführungsform hat vor allem die Vorteile, dass die Stahlhülse 21 in Achsrichtung formschlüssig mit dem Rohrkörper 2 verbunden ist und das Gewinde 3 erheblich weniger zum Anfres¬ sen neigt als ein in Kunststoff ausgebildetes Gewinde. Demsel¬ ben Zweck dient der Flansch 25. Die Hülse 24 stützt den Rohr¬ körper 3 gegen radiale Kompression ab. Mit der Ausbildung nach Figur 4 ist es daher leichter, das Rohr zur Verlängerung des Ankerrohres 1 vom Gewindezapfen der Bohrmaschine zu lösen. This embodiment has the advantages, in particular, that the steel sleeve 21 is connected to the tubular body 2 in a form-fitting manner in the axial direction and that the thread 3 tends to seize considerably less than a thread formed in plastic. The flange 25 serves the same purpose. The sleeve 24 supports the tubular body 3 against radial compression. With the design according to FIG. 4, it is therefore easier to detach the tube for extending the anchor tube 1 from the threaded pin of the drilling machine.

Claims

Patentansprüche claims
1. Ankerstab für einen Bohr-Injektionsanker, bestehend aus einem faserverstärkten Kunststoffrohr (1), das sowohl längsge¬ richtete als auch wendeiförmig gewickelte Fasern (6, 7) enthält und an beiden Enden ein Gewinde (3) aufweist.1. Anchor rod for a drill injection anchor, consisting of a fiber-reinforced plastic tube (1), which contains both longitudinally as well as helically wound fibers (6, 7) and has a thread (3) at both ends.
2. Ankerstab nach Anspruch 1, wobei das Gewinde (3) ein Rundgewinde mit im Axialschnitt rundem Gewindekamm (5) und run¬ dem Gewindegrund (4) ist.2. Anchor rod according to claim 1, wherein the thread (3) is a round thread with a round thread comb in axial section (5) and round the thread root (4).
3. Ankerstab nach Anspruch 1 oder 2, wobei das Gewinde (3) auf den Rohrkörper (2) aufgegossen oder in den Rohrkörper (2) eingeformt oder eingeschnitten ist.3. Anchor rod according to claim 1 or 2, wherein the thread (3) is cast onto the tubular body (2) or molded or cut into the tubular body (2).
4. Ankerstab nach Anspruch 1 oder 2, wobei das Gewinde (3) in einer auf den Rohrkörper (2) aufgeklebten Hülse (8, 21 ) ge¬ bildet ist. 4. Anchor rod according to claim 1 or 2, wherein the thread (3) in a on the tubular body (2) glued sleeve (8, 21) is ge.
5. Ankerstab nach Anspruch 4, wobei die Hülse (21) aus mindestens zwei Schalenteilen (20) besteht, die auf den Rohr¬ körper (62) radial aufgepresst sind.5. Anchor rod according to claim 4, wherein the sleeve (21) consists of at least two shell parts (20) which are radially pressed onto the Rohr¬ body (62).
6. Ankerstab nach Anspruch 5, wobei die Schalenteile (20) längs den Trennlinien mit mehreren Vorsprüngen (22) und dazu passenden Einschnitten (23) ineinandergreifen.6. Anchor rod according to claim 5, wherein the shell parts (20) engage along the dividing lines with a plurality of projections (22) and matching incisions (23).
7. Ankerstab nach Anspruch 5 oder 6, wobei die Schalen¬ teile (20) an mehreren Stellen miteinander verschweisst sind.7. Anchor rod according to claim 5 or 6, wherein the Schalen¬ parts (20) are welded together at several locations.
8. Ankerstab nach einem der Ansprüche 1-7, wobei die wen¬ deiförmig gewickelten Fasern (7) zumindest überwiegend den ent¬ gegengesetzten Steigungssinn haben wie die beiden Gewinde (3).8. Anchor rod according to one of claims 1-7, wherein the helically wound fibers (7) at least predominantly have the opposite pitch sense as the two threads (3).
9. Ankerstab nach einem der Ansprüche 1-8, wobei die wen¬ deiförmig gewickelten Fasern (7) überwiegend im äusseren Be¬ reich des Rohres (1) angeordnet sind.9. Anchor rod according to one of claims 1-8, wherein the wedge-shaped fibers (7) are predominantly arranged in the outer region of the tube (1).
10. Ankerstab nach einem der Ansprüche 1-9, wobei die bei¬ den Gewinde (3) Aussengewinde sind. 10. Anchor rod according to one of claims 1-9, wherein the two threads (3) are external threads.
EP96900026A 1995-01-06 1996-01-05 Rod for an anchor inserted by drilling and injection grouting Expired - Lifetime EP0800615B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH36/95 1995-01-06
CH3695 1995-01-06
PCT/CH1996/000003 WO1996021087A1 (en) 1995-01-06 1996-01-05 Rod for an anchor inserted by drilling and injection grouting

Publications (2)

Publication Number Publication Date
EP0800615A1 true EP0800615A1 (en) 1997-10-15
EP0800615B1 EP0800615B1 (en) 1998-12-02

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EP96900026A Expired - Lifetime EP0800615B1 (en) 1995-01-06 1996-01-05 Rod for an anchor inserted by drilling and injection grouting

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EP (1) EP0800615B1 (en)
JP (1) JPH10512025A (en)
AT (1) ATE174103T1 (en)
AU (1) AU4296296A (en)
DE (1) DE59600905D1 (en)
WO (1) WO1996021087A1 (en)

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DE10106695B4 (en) * 2001-02-14 2010-11-25 Friedr. Ischebeck Gmbh Drill bit for a drill or injection anchor
SE0100915L (en) * 2001-03-15 2002-09-16 Atlas Copco Rock Drills Ab Procedure for reinforcing rock and soil masses and rock bolts for the practice of the process
DE10219155C1 (en) * 2002-04-29 2003-12-18 Welser Profile Ag A metal mining plug
EP1680559B1 (en) 2003-10-10 2009-12-23 Erico International Corporation Device comprising a rod made of fiber-reinforced plastic for transferring a load through a heat-insulating layer
DE102004057711B3 (en) * 2004-11-30 2006-09-21 Hilti Ag Anchoring element for fixing in a mineral base such as concrete or masonry comprises a thermoset encasing part surrounding an anchor
DE102006025248A1 (en) * 2006-05-29 2007-12-06 Beltec Industrietechnik Gmbh Fiber reinforced plastic drilling anchor
NO20210696A1 (en) * 2021-06-02 2022-12-05 Tunnelsupply As Strut for anchoring fittings in tunnels and rock rooms

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DE2749068A1 (en) * 1977-11-02 1979-05-03 Gebirgssicherung Gmbh Mine anchorage rod embedded in hardening resin - has flexible externally roughened inner plastics sleeve around glass fibre rods
DE3806128A1 (en) * 1988-02-26 1989-09-07 Ischebeck Friedrich Gmbh DRILL INJECTION ANCHOR
DE4018703C1 (en) * 1990-06-12 1991-08-01 Johannes Radtke Improved cable anchor - includes several laminations and has fixing at end towards bottom of bore hole
GB2262970B (en) * 1991-12-19 1995-02-15 Bridon Plc Flexible roof bolt
DE4209265A1 (en) * 1991-12-21 1993-06-24 Dyckerhoff & Widmann Ag DEVICE FOR ANCHORING A ROD-SHAPED TENSION LINK MADE OF FIBER COMPOSITE MATERIAL
DE4204533C2 (en) * 1992-02-15 1994-03-17 Gd Anker Gmbh & Co Kg Injection drill anchor
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See references of WO9621087A1 *

Also Published As

Publication number Publication date
AU4296296A (en) 1996-07-24
WO1996021087A1 (en) 1996-07-11
EP0800615B1 (en) 1998-12-02
ATE174103T1 (en) 1998-12-15
DE59600905D1 (en) 1999-01-14
JPH10512025A (en) 1998-11-17

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