EP2257690B1 - Cheville autoforeuse protégée contre la corrosion, et bloc d'éléments de cheville, et leur procédé de fabrication - Google Patents

Cheville autoforeuse protégée contre la corrosion, et bloc d'éléments de cheville, et leur procédé de fabrication Download PDF

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Publication number
EP2257690B1
EP2257690B1 EP09721454A EP09721454A EP2257690B1 EP 2257690 B1 EP2257690 B1 EP 2257690B1 EP 09721454 A EP09721454 A EP 09721454A EP 09721454 A EP09721454 A EP 09721454A EP 2257690 B1 EP2257690 B1 EP 2257690B1
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EP
European Patent Office
Prior art keywords
anchor
subunit
tube
self
hollow rod
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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.)
Not-in-force
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EP09721454A
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German (de)
English (en)
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EP2257690A1 (fr
Inventor
Frank Schmidt
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Dywidag Systems International GmbH
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Dywidag Systems International GmbH
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Publication date
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Publication of EP2257690A1 publication Critical patent/EP2257690A1/fr
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Not-in-force 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
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0013—Protection against corrosion
    • 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
    • E21D21/0053—Anchoring-bolts in the form of lost drilling rods

Definitions

  • the invention relates to a corrosion-protected self-drilling anchor according to the preamble of patent claim 1, a method for its production according to independent claim 10 and a prefabricated anchor assembly according to independent claim 15.
  • Soil and rock anchors as well as piles are used in civil engineering whenever it comes to inducing forces in the area of the anchor or pile head into deeper soil layers. This applies equally to anchor and nails loaded by tension and to piles loaded with pressure or tension.
  • anchor, nails or piles on a support member which is brought in a wellbore with the surrounding ground in non-positive association and anchored at the air side end in the region of the head. Since the support members are usually made of steel, they are sensitive to corrosion.
  • support members for temporary use and support members for permanent use, the latter use requires a design suitable for protection against corrosion constructive training.
  • a double or increased corrosion protection is then spoken of when a passivation of the steel surface of the support member is ensured by injecting a cement mortar and an additional, the armature enveloping plastic tube is a diffusion barrier for liquids.
  • a special case among the anchors is the self-drilling anchor, whose applications are mainly in the production of soil nails, micropiles and Temporärankem.
  • Edohranker like from the CH 693 934 which is known as the closest prior art, consist essentially of a number of Anchor rods with a continuous axial cavity.
  • a drill bit is arranged with rinsing nozzles, which are connected via the continuous axial cavity with a drilling and Injizier affection at the air side anchor end.
  • the extension of the self-drilling anchor after drilling a respective anchor rod is done by forming a Muffenschreibseses. If a self-drilling anchor has reached its predetermined length, the resulting bore hole is injected with cement mortar through the axial cavity and, if appropriate, the anchorage is hardened after the injection material has hardened.
  • the object of the invention is to further develop known self-drilling anchors, in order to make them suitable for permanent use even in a corrosion-prone environment.
  • a further object of the invention is to specify a method and prefabricated anchor subunits for producing such an anchor.
  • the invention provides a solution that ensures corrosion protection both in the area of the hollow rods and the joint area. This is achieved by an axially continuous combination of cladding and socket pipes, which represent a first barrier against externally coming, corrosion-causing substances.
  • the cavity formed thereby to the hollow bar element is filled in each case with a corrosion protection compound, which forms the second barrier against corrosion, which is why it is spoken of a double corrosion protection.
  • An anchor according to the invention therefore combines for the first time the advantages of a self-drilling anchor with the advantages of a double corrosion-protected anchor or pile.
  • the cavity is filled up with a first anticorrosion compound which consists of a hardenable material, for example a mortar or a suspension based on cement or synthetic resin.
  • a first anticorrosion compound which consists of a hardenable material, for example a mortar or a suspension based on cement or synthetic resin.
  • the cavity filling consists of a second anticorrosion compound, which differs in its kind from the first anticorrosion compound and consists for example of a plastically deformable material such as grease and the like.
  • an adapter is provided at the ends of the cladding tube, which already close the frontal openings of the cladding tubes close to the hollow bar during manufacture of the prefabricated anchor subunits and at the same time enables a tight connection of the sleeve tube.
  • the adapter preferably has a cylindrical seat, on which the sleeve tube is axially plugged, wherein in the insertion region means for Position assurance and sealing of the sleeve tube may be arranged, for example in the form of a circumferential bead.
  • the cladding tube and the adapter thus form a cavity surrounding the hollow, tightly closed cavity, which makes it possible to prefabricate by default pre-injecting this cavity with a hardenable anticorrosive Anchoring units as standard.
  • a hardenable anticorrosive Anchoring units as standard.
  • the adapters which act as a lost formwork, the end faces of the cavity are closed only temporarily for the Injiziervorgang and until the hardening of the suspension.
  • Anchor Units offer the great advantage that can be produced under consistently optimal conditions and independent of climatic influences. This ensures a consistently high quality of the anchoring units produced in this way with a corresponding increase in quality in the finished self-drilling anchor.
  • the anticorrosion composition within the cladding tube without regard to the subsequent pressing of the borehole can be specially adapted to the requirements of optimum corrosion protection, for example, by its particular composition and the manner of its introduction. For the pressing of the borehole after the anchor has been installed, then a likewise optimized for this application cement mortar can be used.
  • a further preferred embodiment of the invention also has a drill bit with a nozzle with obliquely forwardly pointing outlet openings in the drilling direction.
  • the pressure jet emerging from the nozzle loosens the substrate lying in front of the nozzle and can even loosen and crush it when high pressures are applied.
  • the arrangement of a nozzle with a radial outlet opening can be provided. This results in the advantage that the loosened substrate for the drill bit can be solved more easily, so that as far as possible vibration-free propulsion is possible. This minimizes the risk of crack formation in the area of the pre-injected corrosion protection of the hollow bar anchor.
  • Fig. 1 an inventive self-drilling anchor 1 is shown in an overview, as it can be used advantageously in injectable soils.
  • the armature 1 consists of two factory-prefabricated subunits A and B of essentially the same design, which are pushed together in a force-locking manner along the armature longitudinal axis 2.
  • the length of units A and B can be as required vary between 1 m and 6 m.
  • the structural design of the subunits A, B also goes from the FIGS. 2, 3 and 4 out.
  • a hollow rod member 3 which is provided over its entire length with an external thread 4 and which has an axial through hole 5 in the region of its longitudinal axis 2.
  • the hollow bar element 3 is surrounded over its entire length, except for its end sections 3 ', 3 ", by a ribbed jacket tube 6.
  • the two ends of the ribbed jacket tube 6 are connected tightly to the hollow bar 3 by means of the adapters 7.
  • the adapter 7 has a connection piece 8, onto which the jacket tube 6 is pushed axially, and in the direction of the one end section 3 'a cylindrical seat 9, the jacket surface of which has a peripheral bead Hollow bar element 3 is factory completely filled with a first corrosion protection compound 10, for example with a curable injection mortar.
  • B anchor 1 By frictional axial joining together a plurality of such prefabricated subunits A, B anchor 1 can be made of any length.
  • a socket joint For joining together a socket joint is provided, the constructive training to achieve a corrosion protection mainly from Fig. 2 evident. There you can see the free end portions 3 'of two axially opposite hollow rod elements 3, which are connected by means of a screw sleeve 8 tensile and pressure-resistant together.
  • the joint area is also surrounded over the entire length of the end portions 3 'by a sleeve tube 12, which bears tightly against the cylindrical seat 9 of the adapter 7 with its ends while maintaining a slight axial play.
  • the cavity between the sleeve tube 12 and the end portions 3 'of the hollow rods 3 and der Screw sleeve 11 is filled with a second anticorrosion compound 13, for example with a grease.
  • a double corrosion protection is also present in the joint area, which is formed on the one hand by the diffusion-proof sleeve pipe 12 and on the other hand by the corrosion protection compound 13.
  • Over the length of an armature according to the invention thus results in an alternating sequence of longitudinal sections, in which once the pre-injected with the first anticorrosion compound 10 sheath 6 provides corrosion protection and once the filled with the second anticorrosion compound 13 sleeve tube 12th
  • the subunit A forms the beginning of an armature 1 according to the invention, the end portion 3 "of which is assigned to the bottom of the borehole not being intended to form a socket joint but to receive a drill bit 14. For this reason, the modified adapter 7 'arranged at the end 3" does not have a cylindrical one Seat 9 on.
  • the structural design of the drill bit 14 goes out Fig. 5 according to which it has a cylindrical body 15, to which a cone tip 16 connects to one side. From the lateral surface of the apex 16 extend blades 17 in the radial direction with cutting 18 for releasing and conveying the substrate. From the other side of the cylindrical body 15, starting in the transition region between the cylindrical body 15 and the apex 16 extends in the longitudinal axis 2, a blind bore 19 with internal thread into which the hollow rod 3 of the subunit A with its end 3 "is screwed.
  • the drill bit 14 has a first injection nozzle 20, which extends from a bore perpendicular to the conical surface up to the blind bore 19, and a second nozzle 21, which is formed by a bore perpendicular to the cylindrical surface of the body 15, ie radially. In this way, together with the cavity 5 of the individual hollow rod elements 3, a continuous cavity over the entire length of the armature 1 up to the nozzles 20 and 21 results.
  • the subunit B forms the air-side end of the armature 1, so that here also the free end 3 "of the hollow rod 3 is not used to form a Muffenschenses, but to form the air-side anchoring.
  • an anchor plate 22 To the end portion 3 "is an anchor plate 22 is inserted, which is intended to support against the ground 25.
  • a sealing tube 23 is fixedly connected to the underside of the anchor plate 22 and surrounds the Ripprohr 6 at a radial distance on the end portion 3" is finally screwed a cap nut 24, which is supported with its spherical peripheral surface on the anchor plate 22 and thus enables a tensioning of the armature 1.
  • the cavity between sealing tube 23 and end section 3 "of hollow bar member 3 is also injected with a cement mortar.
  • Fig. 7a shows the beginning of the production of an armature according to the invention 1.
  • a subunit A comprising a hollow rod member 3 with a drill bit 14 and a corrosion protection arranged behind it, consisting essentially of the Ripprohr 6 and the already factory introduced, hardened corrosion protection compound 10, with a not Further drilling equipment drilled in the underground drilled.
  • scavenging air or rinsing liquid is transported through the through-hole 5 to the nozzles 20 and 21 at the tip of the armature 1 under high pressure to loosen and loosen the ground. The dissolved material is then flushed out between the cladding tube 6 and the borehole wall.
  • Fig. 7b shows a state in which the borehole has reached a depth at which the subunit A projects substantially only with its end 3 'from the borehole. is reached this state, a screw sleeve 11 is screwed with its half length on the end 3 ', so that the other half of the screw sleeve 11 is for receiving the hollow bar 3 another subunit B available.
  • a corrosion protection compound 13 for example in the form of grease, is applied generously to the sleeve 11 as well as to the exposed areas of the end 3 'of the hollow bar element 3 Fig. 7c is shown.
  • a new subunit for example, the subunit B described above, are screwed into the thus prepared end of the subunit A.
  • the further subunit also has an already factory-made corrosion protection in the region of the cladding tube 6, as described above.
  • a corrosion protection compound 13 is also previously applied to the free end 3 'of the hollow rod member 3 of the subunit B and then screwed into the threaded sleeve 11.
  • the sleeve tube 12 pushes with its free edge on the cylindrical seat 9 of the adapter 7 and thus forms a continuous and sealed connection of the ribbed sheaths 6 of the two subunits A and B.
  • the anchorage is applied at the end of the anchor 1.
  • an anchor plate 22 with attached sealing tube 23 is pushed onto the end 3 "of the hollow rod member 3 of the subunit B until the anchor plate 22 rests flat against the substrate 25.
  • a cap nut 24 is screwed onto the end 3" until it is crowned Bottom of the anchor plate 22 abuts.
  • the completion of the armature 1 is done by pressing the borehole, that is, the annular gap between sheath 6 and borehole wall with a Cement mortar and optionally by tensioning the anchor 1 after the cement mortar has hardened.
  • FIG. 6 shows the use of a self-drilling anchor 26 according to the invention as a post 30.
  • the pile 30 Up to the air side anchoring of the pile 30, the pile 30 has an identical structure to that of the FIGS. 1 to 5 described anchor 1, so that the same reference numerals are used for the same features and reference is made to avoid repetition to the local part of the description.
  • an anchor plate 27 is fixed between a nut 28 and a lock nut 29 in a predetermined position. Since this area is completely enclosed at a later time by the concrete of the pile top plate, can be dispensed with a sealing tube.

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  • 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)
  • Dowels (AREA)
  • Joining Of Building Structures In Genera (AREA)

Claims (15)

  1. Cheville autoforeuse (1, 30) protégée contre la corrosion, conçue pour être placée à l'intérieur d'un trou foré et comprenant un certain nombre d'unités partielles d'ancrage (A, B) qui sont respectivement pourvues d'un élément (3) du type tige creuse et sont reliées les unes aux autres, en formant une zone d'aboutement tubulaire axial, pour constituer un organe cohérent résistant à la traction et à la pression, la première unité partielle (A) présentant une couronne de perçage (14) et la dernière unité partielle (B) pouvant être reliée à un dispositif de perçage et d'injection, avec verrouillage rotatif, caractérisée par le fait que chaque élément (3) du type tige creuse est entouré par un tube d'enveloppement (6), hormis sur ses tronçons d'extrémité (3', 3"), et l'interstice annulaire, entre ledit tube d'enveloppement (6) et ledit élément (3) du type tige creuse, est comblé sous pression par une première masse (10) de protection anticorrosion ; et par le fait qu'une manchette (12) se rattache de manière étanche, dans la région de la zone d'aboutement tubulaire, aux tubes d'enveloppement (6) des deux éléments (3) du type tige creuse formant associativement ladite zone d'aboutement tubulaire, sachant que la cavité, située entre la manchette (12) et les éléments (3) du type tige creuse, est emplie d'une seconde masse (13) de protection anticorrosion.
  2. Cheville autoforeuse selon la revendication 1, caractérisée par le fait qu'un adaptateur (7, 7') respectivement implanté sur l'élément (3) du type tige creuse, et auquel la manchette (12) peut être rattachée pas ses extrémités, est disposé à chaque extrémité du tube d'enveloppement (6) d'une unité partielle (A, B).
  3. Cheville autoforeuse selon la revendication 2, caractérisée par le fait que l'adaptateur (7, 7') assure respectivement, aux faces extrêmes, l'obturation étanche de la cavité située entre le tube d'enveloppement (6) et l'élément (3) du type tige creuse.
  4. Cheville autoforeuse selon la revendication 2 ou 3, caractérisée par le fait que l'adaptateur (7) offre un siège cylindrique (9) dédié à la manchette (12).
  5. Cheville autoforeuse selon la revendication 2 ou 4, caractérisée par le fait qu'au moins un bourrelet périphérique se trouve dans la surface de contact entre l'adaptateur (7) et la manchette (12).
  6. Cheville autoforeuse selon l'une des revendications 2 à 5, caractérisée par le fait que l'adaptateur (7) présente dans la zone de chevauchement avec la manchette (12), en direction de l'axe longitudinal (2) de ladite cheville, un retrait radial correspondant, de préférence, à l'épaisseur de ladite manchette (12).
  7. Cheville autoforeuse selon l'une des revendications 1 à 6, caractérisée par le fait que la couronne de perçage (14) comporte une buse (20), dont l'orifice de sortie engendre un jet de sortie dirigé à l'oblique vers l'avant.
  8. Cheville autoforeuse selon l'une des revendications 1 à 7, caractérisée par le fait que la couronne de perçage comporte une buse (21), dont l'orifice de sortie engendre un jet radial de sortie.
  9. Cheville autoforeuse selon l'une des revendications 1 à 8, caractérisée par le fait que la cavité située entre le tube d'enveloppement (6) et la paroi du trou foré est comblée, sous pression, par du mortier au ciment dont la nature diffère de celle de la première masse (10) de protection anticorrosion.
  10. Procédé de fabrication d'une cheville autoforeuse (1, 30) protégée contre la corrosion, caractérisé par les étapes opératoires suivantes :
    a) pré-apprêtage d'un certain nombre d'unités partielles d'ancrage (A, B) par mise en place d'un tube d'enveloppement (6) sur un élément (3) du type tige creuse et par injection, dans la cavité située entre ledit tube d'enveloppement (6) et ledit élément (3) du type tige creuse, d'une première masse durcissable (10) de protection anticorrosion,
    b) mise en place d'une couronne de perçage (14) sur l'une (3") des extrémités du premier élément (3) du type tige creuse et encastrement, par forage, de la première unité partielle (A) dans la structure sous-jacente (25), avec rinçage concomitant dudit élément (3) du type tige creuse à l'aide d'un fluide, jusqu'à ce que ladite première unité partielle (A) soit logée dans le trou foré par la majeure partie de sa longueur,
    c) instauration d'une zone d'aboutement tubulaire entre l'élément (3) du type tige d'une première unité partielle d'ancrage (A), et l'élément (3) du type tige d'une seconde unité partielle supplémentaire d'ancrage (B) pré-apprêtée,
    d) liaison des tubes d'enveloppement (6) des deux unités partielles d'ancrage (A, B), par mise en place d'une manchette (12) dans la région de ladite zone d'aboutement tubulaire,
    e) poursuite de l'opération de forage, avec rinçage à l'aide d'un fluide, jusqu'à ce que ladite seconde unité partielle (B) soit logée dans le trou foré par la majeure partie de sa longueur,
    f) réitération des étapes opératoires c), d) et e), jusqu'à ce que la cheville autoforeuse (1, 30) ait atteint la longueur conforme à sa destination,
    g) instauration de l'ancrage du côté librement apparent,
    h) injection de mortier au ciment dans la cavité située entre le tube d'enveloppement (6) et la paroi du trou foré.
  11. Procédé selon la revendication 10, caractérisé par le fait que l'étape opératoire d) est tout d'abord exécutée par rattachement d'une manchette (12) à l'extrémité librement apparente du tube d'enveloppement (6) de la première unité partielle (A), avant instauration de la zone d'aboutement tubulaire, puis par rattachement du tube d'enveloppement (6) de l'unité partielle supplémentaire (B), à ladite manchette (12), après instauration de ladite zone d'aboutement tubulaire.
  12. Procédé selon la revendication 10 ou 11, caractérisé par le fait que la cavité, située entre le tube d'enveloppement (6) et les éléments (3) du type tige creuse, est emplie d'une masse (10) de protection anticorrosion dans la région de la zone d'aboutement tubulaire.
  13. Procédé selon l'une des revendications 10 à 12, caractérisé par le fait que la structure sous-jacente (25) est ameublie, au cours du forage, dans la région située devant la couronne de perçage (14) et/ou latéralement par rapport à cette dernière.
  14. Procédé selon la revendication 13, caractérisé par le fait que l'ameublissement de la structure sous-jacente (25) est effectué par projection de jets pressurisés.
  15. Unité partielle d'ancrage (A, B) préfabriquée, destinée à la fabrication d'une cheville autoforeuse (1) protégée contre la corrosion, pourvue d'un élément (3) du type tige creuse et caractérisée par le fait que ledit élément est entouré, hormis sur ses deux extrémités, par un tube d'enveloppement (6) disposé coaxialement, sachant que l'espace annulaire, entre ledit tube d'enveloppement (6) et ledit élément (3) du type tige creuse, est empli d'une masse durcie (10) de protection anticorrosion.
EP09721454A 2008-03-18 2009-03-18 Cheville autoforeuse protégée contre la corrosion, et bloc d'éléments de cheville, et leur procédé de fabrication Not-in-force EP2257690B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008014700A DE102008014700A1 (de) 2008-03-18 2008-03-18 Korrosionsgeschützter Selbstbohranker sowie Verfahren zu dessen Herstellung
PCT/EP2009/001994 WO2009115307A1 (fr) 2008-03-18 2009-03-18 Cheville autoforeuse protégée contre la corrosion, et bloc d'éléments de cheville, et leur procédé de fabrication

Publications (2)

Publication Number Publication Date
EP2257690A1 EP2257690A1 (fr) 2010-12-08
EP2257690B1 true EP2257690B1 (fr) 2011-09-21

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Application Number Title Priority Date Filing Date
EP09721454A Not-in-force EP2257690B1 (fr) 2008-03-18 2009-03-18 Cheville autoforeuse protégée contre la corrosion, et bloc d'éléments de cheville, et leur procédé de fabrication

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Country Link
US (1) US8142109B2 (fr)
EP (1) EP2257690B1 (fr)
AT (1) ATE525549T1 (fr)
AU (1) AU2009226749A1 (fr)
BR (1) BRPI0910396A2 (fr)
CA (1) CA2718556A1 (fr)
DE (1) DE102008014700A1 (fr)
ES (1) ES2374147T3 (fr)
PT (1) PT2257690E (fr)
WO (1) WO2009115307A1 (fr)

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CN109853542B (zh) * 2019-03-29 2023-11-28 厦门源昌城建集团有限公司 一种用于拉压复合型锚杆的防串浆套管接头及锚杆
CN112411617B (zh) * 2020-11-23 2022-03-18 安徽华盛国际建筑设计工程咨询有限公司 一种垂直挡土结构及其施工方法
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Also Published As

Publication number Publication date
PT2257690E (pt) 2011-12-15
ES2374147T3 (es) 2012-02-14
BRPI0910396A2 (pt) 2015-10-06
US20110070034A1 (en) 2011-03-24
CA2718556A1 (fr) 2009-09-24
ATE525549T1 (de) 2011-10-15
US8142109B2 (en) 2012-03-27
DE102008014700A1 (de) 2009-09-24
WO2009115307A1 (fr) 2009-09-24
EP2257690A1 (fr) 2010-12-08
AU2009226749A1 (en) 2009-09-24

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