EP0728256B1 - Injection cable bolt - Google Patents

Injection cable bolt Download PDF

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Publication number
EP0728256B1
EP0728256B1 EP95900707A EP95900707A EP0728256B1 EP 0728256 B1 EP0728256 B1 EP 0728256B1 EP 95900707 A EP95900707 A EP 95900707A EP 95900707 A EP95900707 A EP 95900707A EP 0728256 B1 EP0728256 B1 EP 0728256B1
Authority
EP
European Patent Office
Prior art keywords
rope
injection
characterised
anchor according
section
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
EP95900707A
Other languages
German (de)
French (fr)
Other versions
EP0728256A1 (en
Inventor
Johannes Radtke
Original Assignee
Johannes Radtke
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 DE9317336U priority Critical
Priority to DE9317336U priority patent/DE9317336U1/en
Application filed by Johannes Radtke filed Critical Johannes Radtke
Priority to PCT/EP1994/003730 priority patent/WO1995013453A1/en
Publication of EP0728256A1 publication Critical patent/EP0728256A1/en
Application granted granted Critical
Publication of EP0728256B1 publication Critical patent/EP0728256B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0033Anchoring-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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/006Anchoring-bolts made of cables or wires
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/008Anchoring or tensioning means

Abstract

The proposed injection cable bolt, for use in particular in mining, tunnelling and slope or embankment construction as well as for securing rock faces, consists essentially of a cable with a core in the form of a high-pressure hose and consisting of, for example, heavy-duty synthetic or natural textile yarns. Injection cable bolts of this type are surrounded by a ret-like backing mesh and provided with a securing element, a sealing element and, outside the bove, a connecting element. The securing element (6) is connected to the cable end (7) by a shrinking hose (8), and the sections (16, 17) of the sealing element (15) are designed as two-half shells (18) which can fit together. The interior of the section (16) directed at the mouth of the bore is cylindrical over its entire length, and the section (17) is cylindrical on the outside. The slide-over section (17) has on the inside two opposing conical extensions (23, 24) facing away from the cable (2). The sleeve (26), which can be securely attached to the cable end by shrinkage or with adhesive, at least partially encompasses the connecting element (27), and a tube (28) which can be inserted in the core (3) is arranged in the connecting element (27).

Description

  • The invention relates to an injection rope anchor, in particular for mining, tunneling and embankment construction and for rock securing, which essentially consists of a rope designed as a high-pressure hose consisting of, for example, high-performance textile yarns, such as chemical and / or natural fibers, and a mesh-like braid is surrounded, and which is provided with a holding element and a sealing element consisting of two sections which can be pushed onto one another via conically shaped annular surfaces, and outside the borehole with a connecting element which is arranged in a sleeve comprising the cable end. Such a device is already known from DE-C-4 018 703.
  • A generic rope anchor is also described in more detail in German Patent 40 18 703. Such a rope anchor, designed as an injection anchor, has the advantage of an adapted flexibility and thus advantageously allows use out of cramped cavities when a corresponding tensile force is taken over. In addition, there is a further advantage in the possibility of equipping such anchors with a long length, handling them extremely simply and safely and, moreover, ensuring practical transportation.
  • A disadvantage that adheres to the generic designs of injection cable anchors is in the described embodiment. The anchor has a rope-sheathed core and the rope is surrounded by a support grid, and the rope and support grid are in turn encased in a protective sheath made of plastic.
  • It has been found that the protective sheathing during injection ensures that the injection material within the sheathing in the rope ensures intimate bonding, but that the injection material cannot escape to the desired extent over the entire length of the rope anchor. The protective jacket is a disruptive factor for the optimal injection. The support grid is tightly embedded on the rope within the sheathing in the bond, but due to the lack of expansion, it does not form an additional, self-supporting support element.
  • Another disadvantage of the injection cable anchor described in the above-mentioned patent is that the connections of the holding and connecting element at the opposite cable ends are very complicated and are not based on the tensile forces to be transmitted by the cable. Likewise, the sealing element provided for sealing the borehole, which consists of two wedge elements that can be pushed against one another, as practice shows, can be improved, since simply pushing one another together, due to the pressure medium, does not guarantee an active sealing of the two elements.
  • In contrast, the invention has for its object to provide an injection rope anchor, in particular for mining, tunneling and embankment construction and for rock securing, which can be used as a pure injection anchor as well as tensionable anchor while avoiding the disadvantages inherent in the prior art enables an optimal injection and is easy and inexpensive to manufacture.
  • This object is achieved in that the holding element is connected to the rope end by means of a shrink tube, that the sections of the sealing element are each made up of two half-shells, the section directed toward the mouth of the borehole over the entire length on the inside and the section that can be pushed on the outside are cylindrical, and the push-on section on the inside has two conical extensions directed away from the rope and running in opposite directions, and that the sleeve that can be firmly connected to the rope end by shrinking or gluing encompasses the connecting element at least partially, and in the connecting element a the core insertable pipe socket is arranged. Alternatively, a two-layer or multi-layer holding element can be applied to the rope end.
  • A particular advantage of the invention is first of all to be seen in the fact that the holding element which can be connected by means of a shrink tube to the rope end directed towards the bottom of the hole has a roof-like cap with a central tip and at least laterally injection openings, wherein the roof-like cap is provided with retaining fingers projecting beyond the diameter of the borehole, for example arranged in a star shape. The connection of the rope end to the holding element by means of a shrink tube forms a tension-resistant connection, which makes it possible to adjust the injection rope anchor immediately after the insertion into a borehole to the tensile force required for tensioning. The star-like holding fingers, which represent only one embodiment, cling to the wall of the borehole and still leave room to distribute the injection material via the injection openings arranged laterally in the holding element in such a way that it can penetrate into the borehole above the roof-like cap. It is conceivable to additionally arrange at least one central injection opening in the cap, which can be closed, for example, by means of a flap.
  • Furthermore, there is a particular advantage in the design and arrangement of the sections forming the sealing element. The individual sections can each be composed of half-shells, which are designed to be connected via push-button-type cam connections, and which can also be additionally glued. The half-shells, which additionally have cams engaging in the rope on the inside for local anchoring, can be easily attached to any desired location of a rope anchor due to the assembly. The section that can be pushed onto the section that can be fixed has a particularly advantageous design. The outside facing the borehole is cylindrical, while on the inside this section, as already mentioned, has two opposite tapered extensions. With a conical extension facing the other section, the wedge, driven by the injection medium, slides over the lower wedge and thus helps to seal. Since the push-on section of the sealing element is made of a softer material than the one fixed on the rope and the injection medium penetrates under high pressure into the conical extension, the wedge is pressed against the borehole wall to completely seal the borehole, with an additional one at the corresponding points Teeth penetrate into the borehole wall. In order to allow the air compressed during the injection to escape inside the borehole, it is possible to provide the sections of the sealing element on the outside with ventilation slots running in the direction of the cable.
  • Furthermore, it proves to be particularly advantageous in the context of the invention that the rope end directed towards the mouth of the borehole or located outside the borehole can be provided with a sleeve in the form of a shrink tube or, according to a further embodiment, with a sleeve which can be connected to the rope end in an extremely tensile manner.
  • For the execution of an injection cable anchor as a pure injection anchor, it is expedient to provide the connecting element, which is expediently provided with a thread or a quick coupling. This can be done by means of a shrink tube, the shrink tube at least partially surrounding the rope end and the connecting element.
  • To use such an injection rope anchor as a tie rod, it is advantageous to glue the rope end in a sleeve, for example roughened inside, in such a way that an anchor plate can be pushed on and a bracing nut can be screwed on. In all versions, the connection element is connected to a pipe socket made of metal or plastic, which is at least partially inserted into the core within the rope.
  • The core within the rope is a high-pressure hose adapted to the respective injection pressure, which can be provided with an integrated support braid so that the cross section is not narrowed during the manufacture of the rope braided around the core. Depending on the injection to be carried out, it is possible to form the core within the rope over the entire length without a corresponding perforation or slits. On the other hand, it is possible to form the core over the entire length or partially with perforations or through openings.
  • Depending on the use of the rope, this should be made of polyethylene, polyester, kevlar, aramid, nylon, glass fiber, carbon, filaments in thread or fiber form or a mixture of the materials mentioned so that it has the desired load capacity or, for example, the desired elasticity .
  • The rope braid can be made in one or more layers, and the threads used can have different strengths. In addition, types of braiding can be found in Ab depending on the task to be solved. In order to ensure the passage of the injection material over the entire length of the anchor, it is expedient to manufacture the rope with appropriate mesh sizes. In addition, it is possible to reinforce the rope by weaving in, for example, metal wires, as a result of which an antistatic behavior is achieved at the same time.
  • Furthermore, it is possible within the scope of the invention to equip the rope to limit the injection material with an outer, fine-mesh fabric layer in order to increase the consumption, e.g. in jagged loose rock. On the other hand, the rope can be provided with a thin outer skin that can be destroyed when injected, in order, for example, to grout construction joints that arise when concreting different layers.
  • In addition to the antistatic design of the rope and braid, the rope anchors can be made flame-retardant due to various flame-retardant fibers or additional coatings.
  • Several embodiments of the invention are shown in the drawings and are described in more detail below. Show it:
  • Figure 1
    2 shows a section through an exemplary embodiment of the injection rope anchor according to the invention in use as a pure injection anchor,
    Figure 2
    2 shows a section through the exemplary embodiment shown in FIG. 1,
    Figure 3
    an embodiment of the injection rope anchor according to the invention as a tie rod,
    Figure 4
    2 shows a section through a further exemplary embodiment of the injection cable anchor according to the invention as a tie rod,
    Figure 5
    a partial section through the end of an injection anchor,
    Figure 6
    an embodiment for the formation of the connection element in connection with the pipe socket,
    Figure 7
    a section through an embodiment of a sleeve attached to the rope end for a tie rod, and
    Figure 8 u. 9
    two embodiments for a multi-layer rope with a perforated and non-perforated core.
  • The rope 2 used for the various embodiments of injection rope anchors is shown in two multilayer embodiments in FIGS. 8 and 9. The multilayer rope 2 is surrounded by a braid 4 made of synthetic or steel braid and has a core 3, which with or without an integrated braid with and can be used without perforations or through openings 5. The braid can be formed as a fabric from various yarns, to which metallic threads are added in addition to reinforcement and antistatic training. In the section through an exemplary embodiment of an injection cable anchor, a cable anchor 1 is shown schematically in FIG. 1 and shown in section. The cable anchor 1 is arranged within a borehole 12 in the rock or mineral 13. The rope anchor 1, consisting of a rope 2 with an inner core 3, has a holding element 6 at the bottom of the hole at the rope end 7, which is provided in the exemplary embodiment shown with lateral injection openings 10 and a roof-like tip 9. The holding element 6 is firmly connected to the rope end 7 by means of a shrink tube 8. The holding element 6 has holding fingers 11 which have a larger cross section than the borehole 12 and which cling to the borehole wall when the cable anchor 1 is pulled back.
  • Furthermore, the cable anchor 1 has a sealing element 15 which consists of two sections 16 and 17 which can be pushed onto one another. Sections 16 and 17 each consist of two half-shells 18, which can be assembled like a push button by means of cam connections 19 and additionally glued together.
  • The section 16 is attached to a corresponding location on the cable 2 at the mouth of the borehole or within the borehole 12, the cams 21 located on the inside of the half-shells 18 pressing into the cable 2 in such a way that the section 16 is immovably locked.
  • The section 17 of the sealing element 15 which can be pushed onto the section 16 is cylindrical on the outside and has on the inside two conical extensions 23, 24 arranged upwards and downwards or in the longitudinal direction of the cable. The section 17 is advantageously made of a softer material than the section 16. Due to the pressure of the injection agent, the section 17 is pushed onto the section 16 and the injection agent penetrates into the extension 24 and presses the section 16 with the corresponding toothing provided at the edges in such a way that a complete seal is produced.
  • On the rope end 25 looking out of the borehole 12, a connection element 27 is provided for the connection of a hose line for injection, which connection element can be firmly connected to the cable end 25 by means of a shrink tube 26, which partially surrounds the shoulders 30 of the connection element 27. The details within the connecting element 27 are shown in more detail in FIG. The exemplary embodiment described in more detail in FIGS. 1 and 2 can be referred to as a pure injection cable anchor.
  • Instead of the shrink tube 26, the rope end 25 for fixing the pipe socket 28 inserted into the core 3 can be surrounded by a two-shell or multi-shell element.
  • FIGS. 3 and 4 show exemplary embodiments of an injection cable anchor, which can be referred to as tie rods. The embodiment shown in Figure 3 Example of an injection cable anchor shows, in deviation from the exemplary embodiment according to FIG. 1, that the cable end 25 located outside the borehole 12 is arranged in a sleeve 36 designed as a sleeve 26. The sleeve 36, which can be produced from metal or plastic, on the outside, has a thread 39 and, on the one hand, enables an anchor plate 40 to be pushed on and, on the other hand, the anchor plate 40 to be clamped by means of a clamping nut 41. The anchor plate 40 has a spherical cap 42 and the clamping nut 41 also the rounding 43 corresponding to the recess 42. Further details on this exemplary embodiment are shown in FIGS. 6 and 7.
  • In Figure 6 it is indicated that the connecting element 27 is connected to an at least partially insertable into the core 3 pipe socket 28, which is also surrounded by a wedge 35 with a thread 38. This wedge can be screwed into an opening of the sleeve 36 and tensions the rope 2 within the sleeve 36. After inserting the connecting element 27 or the pipe socket 28 into the sleeve 36 or into the rope 2, the rope end 25 becomes inside the sleeve 36 intimately bonded to one another by injection via an injection opening 37. Within the connection element 27, which, as already mentioned, can be provided with a thread 29 or a quick coupling, a cylindrical section 31 and a conically tapering section 32 are provided, as can be seen from FIG. 5, between the end of the pipe socket 28 and a ring-like stopper 34 provided for securing purposes, a check valve 33 is arranged in the form of a lip seal. From the embodiment shown in Figure 5 Example also shows that the pipe socket 28 is inserted into the core 3 and the shrink tube 26 partially engages around the connecting element in the region of the shoulder 30 and thus creates a firm connection.
  • FIG. 4 shows a further embodiment of an injection rope anchor designed as a tie rod, in which a shrink tube 26 is provided for integrating the connecting element 27 into the rope end 25, and a further shrink tube section 44 is provided around the rope 2, and between the two sections 26 and 44 by application, for example by spraying, a sleeve 45 provided with a thread 39 is applied, via which the tensioning of the anchor plate 40 is ensured by means of a tensioning nut 41.
  • The passage openings 5 shown in FIG. 8 in the core 3 can also be designed as slots running in the longitudinal direction of the core 3. In this way, the deepest part of the borehole is first injected during the injection, and the slots are then opened due to the pressure building up, and the entire length of the rope is injected out.
  • Reference list
  • 1
    Rope anchor
    2nd
    rope
    3rd
    soul
    4th
    Braid
    5
    Openings
    6
    Holding element
    7
    Rope end
    8th
    Heat shrink tubing
    9
    roof-like tip
    10th
    Openings
    11
    Holding finger
    12th
    Borehole
    13
    Mountains
    14
    Annulus
    15
    Sealing element
    16
    section
    17th
    section
    18th
    Half shells
    19th
    Cam connection
    20th
    Gearing
    21
    cam
    22
    Vent slot
    23
    conical extension
    24th
    conical extension
    25th
    Rope end
    26
    sleeve
    27
    Connector
    28
    Pipe socket
    29
    thread
    30th
    shoulder
    31
    cylindrical section
    32
    conical section
    33
    check valve
    34
    ring-like stopper
    35
    wedge
    36
    Sleeve
    37
    Injection port
    38
    Thread (wedge)
    39
    Thread (outside)
    40
    Anchor plate
    41
    Bracing nut
    42
    Calotte f. Recess
    43
    Rounding
    44
    Shrink tube section
    45
    Sleeve

Claims (17)

  1. Injection rope anchor, in particular for mining, tunnel and slope construction as well as for securing rocks, comprising essentially a rope (2) with a core (3) in the form of a high-pressure hose, for example of heavy-duty textile yams such as chemical and/or natural fibres, and surrounded by a netlike support weave (4), and which is provided with a holding element (6) and a sealing element consisting of two sections (16, 17) which are pushed onto each other via conically shaped annular surfaces, and outside the borehole (12) with a connecting element (27) which is arranged in a sleeve (26) which encases the rope end (25), characterised in that the holding element (6) is connected to the rope end (7) by means of a shrink hose (8). that the sections (16, 17) of the sealing element (15) are designed as an assembly of two respective semi-spheres (18) and the section (16) which is oriented towards the borehole mouth is over the entire length internally, and the pushed on section (17) externally cylindrical, and the push-on section (17) has on the inside two conical extensions (23, 24) which are facing away from the rope (2) and extend in opposite directions, and the sleeve (26), which is firmly connected to the rope end (25) by way of shrinking or gluing, reaches at least partially around the connecting element (27). and in the connecting element (27) is placed a pipe socket (28) into which the core is inserted.
  2. Injection rope anchor according to Claim 1, characterised in that the holding element (6), which is connectable to the rope end (7) by means of a shrink hose (8), comprises a roofshaped cap with a central tip (9) and at least laterally passages (10), and the roofshaped cap is provided with holding fingers (11), which are arranged, for example, in the shape of a star and protrude over the diameter of the borehole (12).
  3. Injection rope anchor according to Claim 2, characterised in that in the roofshaped cap is additionally arranged at least one injection opening which can be shut like a valve via a flap.
  4. Injection rope anchor according to Claim 1, characterised in that the sections (16, 17) of the sealing element (15), which are assembled of semi-spheres (18), are connectable like press studs via cam connections (19).
  5. Injection rope anchor according to Claim 4, characterised in that the semi-spheres (18) are additionally designed so that they can be glued together.
  6. Injection rope anchor according to Claim 1, characterised in that the section (16) of the sealing element (15) which is oriented towards the borehole mouth is at the lower end, and the section (17) which corresponds with this section (16) is at the upper end provided with a lamella or sawblade like toothing (20) at the respective outside oriented towards the borehole wall.
  7. Injection rope anchor according to Claim 1, characterised in that the section (16) of the sealing element (15) which is oriented towards the borehole mouth is at the inside oriented towards the rope (2) provided with cams (21) which activate the connection to the rope (2).
  8. Injection rope anchor according to Claim 1, characterised in that the sections (16, 17) of the sealing element (15) are on the outside provided with ventilation slots (22) which extend in the direction of the rope.
  9. Injection rope anchor according to Claim 1, characterised in that the connecting element (27), which is made of metal or plastic material. comprises a thread (29) or is an instant coupling.
  10. Injection rope anchor according to Claim 1, characterised in that the connecting element (27) comprises a shoulder (30) which surrounds the pipe socket (28) and receives the rope end (25).
  11. Injection rope anchor according to Claim 1, characterised in that pipe socket (28), which is connected to the connecting element (27) and insensible into the core (3), is arranged in a sleeve (36) in the form of a socket (26), which reaches around the rope end (25) and is on the outside provided with a thread (38) and which is glued over an injection opening (37) to the rope (2).
  12. Injection rope anchor according to Claim 1, characterised in that the core, which is a high-pressure hose, can be produced without perforations (5), with perforations (5) or only in parts with perforations (5).
  13. Injection rope anchor according to Claim 1, characterised in that, depending on application of the rope (2), this is made, for example, of polyester, Kevlar, Aramide, Nylon, fibre glass, carbon, filaments or a mixture of the named materials.
  14. Injection rope anchor according to Claim 1, characterised in that the rope (2) is reinforced by weaving in metal wires.
  15. Injection rope anchor according to Claim 1, characterised in that the rope (2) has an outer fine mesh fabric layer for the purpose of defining the injection material.
  16. Injection rope anchor according to Claim 1, characterised in that the rope (2) is provided with a thin external skin which is destructible during injection.
  17. Injection rope anchor according to Claim 1, characterised in that the passages (5) in the core (3) are arranged as slots which extend in the longitudinal direction of the core (3).
EP95900707A 1993-11-12 1994-11-11 Injection cable bolt Expired - Lifetime EP0728256B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE9317336U 1993-11-12
DE9317336U DE9317336U1 (en) 1993-11-12 1993-11-12 Injection rope anchor
PCT/EP1994/003730 WO1995013453A1 (en) 1993-11-12 1994-11-11 Injection cable bolt

Publications (2)

Publication Number Publication Date
EP0728256A1 EP0728256A1 (en) 1996-08-28
EP0728256B1 true EP0728256B1 (en) 1997-09-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95900707A Expired - Lifetime EP0728256B1 (en) 1993-11-12 1994-11-11 Injection cable bolt

Country Status (10)

Country Link
US (1) US5791824A (en)
EP (1) EP0728256B1 (en)
CN (1) CN1134180A (en)
AT (1) AT157738T (en)
AU (1) AU681462B2 (en)
CA (1) CA2176351A1 (en)
CZ (1) CZ138396A3 (en)
DE (1) DE9317336U1 (en)
PL (1) PL174371B1 (en)
WO (1) WO1995013453A1 (en)

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Also Published As

Publication number Publication date
AU8141894A (en) 1995-05-29
DE9317336U1 (en) 1994-01-27
PL174371B1 (en) 1998-07-31
PL314290A1 (en) 1996-09-02
WO1995013453A1 (en) 1995-05-18
CN1134180A (en) 1996-10-23
AU681462B2 (en) 1997-08-28
CA2176351A1 (en) 1995-05-18
CZ138396A3 (en) 1997-04-16
EP0728256A1 (en) 1996-08-28
AT157738T (en) 1997-09-15
US5791824A (en) 1998-08-11

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