EP3118386B1 - Keil für nachträgliches spannen von bewehrungskabeln - Google Patents

Keil für nachträgliches spannen von bewehrungskabeln Download PDF

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Publication number
EP3118386B1
EP3118386B1 EP16179904.4A EP16179904A EP3118386B1 EP 3118386 B1 EP3118386 B1 EP 3118386B1 EP 16179904 A EP16179904 A EP 16179904A EP 3118386 B1 EP3118386 B1 EP 3118386B1
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Prior art keywords
strand
wedges
wedge
wedge ring
ring
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English (en)
French (fr)
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EP3118386A1 (de
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Felix L. Sorkin
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Priority claimed from US14/838,779 external-priority patent/US9874016B2/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action

Definitions

  • the present disclosure relates generally to post-tensioned, pre-stressed concrete construction.
  • the present disclosure relates specifically to wedges for anchors for use therein.
  • Many structures are built using concrete, including, for instance, buildings, parking structures, apartments, condominiums, hotels, mixed-use buildings, casinos, hospitals, medical buildings, government buildings, research/academic institutions, industrial buildings, malls, bridges, pavement, tanks, reservoirs, silos, foundations, sports courts, and other structures.
  • Pre-stressed concrete is structural concrete in which internal stresses are introduced to reduce potential tensile stresses in the concrete resulting from applied loads. This can be accomplished by two methods-post-tensioned pre-stressing and pre-tensioned pre-stressing.
  • post tensioning concrete the pre-stressing assembly is tensioned after the concrete has attained a specified strength.
  • the pre-stressing assembly commonly known as a tendon, may include for example and without limitation, anchorages, one or more strands, and sheathes or ducts. The strand is tensioned between anchors which are embedded in the concrete once the concrete has hardened.
  • the strand may be formed from a metal or composite or any suitable material exhibiting tensile strength which can be elongated, including, for example and without limitation, reinforcing steel, single wire cable, or multi-wire cable.
  • the strand is typically fixedly coupled to a fixed anchorage positioned at one end of the tendon, the so-called “fixed end”, and is adapted to be stressed at the other anchor, the "stressing end" of the tendon.
  • the strand is generally held to each anchor by one or more wedges.
  • anchors include a tapered recess which, when the strand is placed under tension, causes the wedges to further engage the strand. Wedges are typically made of metal.
  • wedges must be assembled to or threaded onto the end of the strand once the strand is in position in the concrete member. In the case of a bridge or other elevated structure, there is a risk of dropping wedges. Additionally, as strands may extend far from the end of the structure and bend due to gravity, the ability to thread the wedge onto the end of the strand is limited. Furthermore, misalignment between the wedges during installation may damage the strand or result in an insufficient anchor between strand and the anchor.
  • US2007/014630 discloses a continuity system for a building, designed to compensate for the downward settling of building elements over time, which occurs due to the shrinkage of wooden building members.
  • the continuity system comprises one or more hold-down assemblies each having a stud-connector secured to a generally vertical stud, a generally vertical rod inserted into an opening of the stud connector, a rod-gripping member in toothed engagement with the rod above the opening, and one or more positioning elements exerting a downward force on the rod-gripping member.
  • the rod has a lower portion secured to a stable building element such as the building's foundation.
  • the opening of the stud-connector defines a frustoconical bearing surface on the upper surface of a portion of the stud-connector, or on a gripper support element in some embodiments.
  • the rod-gripping member includes a plurality of gripping portions each having a lower surface defining a circumferential portion of a frustoconical shape sized and adapted to conform with the frustoconical bearing surface of the stud-connector.
  • the downward force of the positioning element causes teeth of the gripping portions to disengage from circumferential teeth of the rod so that the rod-gripping member moves downward until the lower surfaces of the gripping portions bear against the frustoconical bearing surface of the stud-connector.
  • the radial components of the reaction forces of the frustoconical bearing surface of the stud-connector causes the teeth of the gripping portions to reengage the teeth of the rod.
  • the frustoconical bearing surface of the stud-connector exerts radially inward compression forces onto the gripping portions to cause the teeth of the gripping portions to engage the teeth of the rod and thereby substantially prevent the rod-gripping member and stud-connector from moving upward relative to the rod.
  • the present disclosure provides for a wedge assembly according to claim 1, for an anchor of a tendon for post tensioning concrete.
  • the present disclosure also provides for a method according to claim 5.
  • FIG. 1 depicts anchor 10 for use in post tensioning concrete.
  • Anchor 10 is adapted to receive and couple to strand 12 of tendon 14.
  • Strand 12 may be, for example and without limitation, mono-wire cable, or multi-wire cable.
  • Anchor 10 may include anchor body 16 adapted to retain the position of anchor 10 when positioned in formed concrete.
  • Anchor 10 may couple to strand 12 by the use of one or more wedges 100.
  • Wedges 100 may be substantially wedge shaped and adapted to fit into a tapered recess 18 formed in anchor body 16. Tension on strand 12 may cause wedges 100 to move into tapered recess 18, applying a gripping force on strand 12.
  • wedges 100 may be coupleable by wedge ring 101.
  • each wedge 100 may include groove 103.
  • Groove 103 may be formed in the outer surface 105 of wedges 100 and adapted to receive wedge ring 101.
  • Groove 103 may be formed in a plane substantially perpendicular to the longitudinal axis of strand 12.
  • wedge ring 101 may be substantially annular and may be formed from a material capable of elastic deformation.
  • Wedge ring 101 may include gap 107. Gap 107 may allow wedge ring 101 to be slipped into groove 103 of wedges 100 when wedges are positioned about strand 12 as depicted in FIG. 1 .
  • wedges 100 may thus be positioned about strand 12 before being coupled by wedge ring 101, allowing wedges 100 to be coupled to strand 12 without having to thread strand 12 through wedges 100.
  • wedge ring 101 may be installed to gap 107 in a direction substantially perpendicular to the extent of the strand. Wedge ring 101 may retain wedges 100 to strand 12 before tensioning of strand 12 relative to anchor 10.
  • gap 107 may be a substantially 60° opening.
  • wedge ring 101 may include expansion features 109. Expansion features 109 may be positioned at either end of gap 107 to, for example and without limitation, allow the ends of wedge ring 101 to more easily pass over wedges 100 to allow gap 107 to expand when wedge ring 101 is installed to grooves 103 of wedges 100.
  • the ends of wedge ring 101 may include a recurve portion to facilitate expansion of wedge ring 101.
  • one or more loops or holes may be utilized to, for example and without limitation, allow a tool such as snap ring pliers to expand wedge ring 101 during installation.
  • wedge ring 101 is capable of being installed from beside wedges 100 when already installed on strand 12, wedge ring 101 does not need to be threaded onto the end of strand 12 before installation to wedges 100. Likewise, wedges 100 may be individually installed to strand 12 rather than being slipped on from the end of strand 12 as in a case where wedges 100 and wedge ring 101 were previously coupled.
  • wedges 100 may be adapted be coupled together prior to installation to strand 12 (not shown) and may include guides 111 adapted to assist with coupling wedges 100 to strand 12.
  • Guides 111 may be positioned to, for example and without limitation, assist in expanding gap 107 by forming a tapered surface against which strand 12 may push. A portion of the force between wedges 100 and strand 12 may thus act to separate wedges 100, allowing for strand 12 to more easily enter wedges 100.
  • Guides 111 may be one or more features positioned on at least a portion of outer surface 105 of one or more wedges 100.
  • guides 111 may, as depicted be chamfered surfaces positioned at an end of wedges 100.
  • guides 111 may be any geometry known in the art including, for example and without limitation, one or more chamfers, ramps, curves, fillets, or combinations thereof. Additionally, guides 111 may be formed at locations on wedges 100 other than that shown in the present disclosure without deviating from the scope of the present disclosure.
  • wedges 100 may be formed such that once positioned on strand 12 as depicted in FIGS. 5A , 5C , wedges 100 form a clearance fit around strand 12.
  • the clearance fit is depicted as annular space 113 in FIG. 5A and is sufficiently small that although a clearance fit is maintained, wedge ring 101' may retain wedges 100 to strand 12.
  • the clearance fit may allow wedges 100 to more easily slide along strand 12 during installation whether installed from the end of strand 12 or from the side.
  • wedges 100 Once installed to tapered recess 18 as depicted in FIG. 5B , wedges 100 may grip strand 12 as annular space 113 is closed.
  • wedge ring 101' may include one or more hooks 115 adapted to maintain the clearance fit between wedges 100 and strand 12 by, for example and without limitation, maintaining separating tension on wedges 100 to maintain gap 107'.
  • the force applied on wedges 100 by tapered recess 18 may be sufficient to overcome the separating tension of wedge ring 101', allowing wedges 100 to grip strand 12.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Claims (14)

  1. Keilanordnung für einen Anker (10) eines Bewehrungskabels (14) zur Verwendung beim nachträglichen Spannen von Beton, umfassend:
    mindestens zwei Keile (100), die dafür ausgelegt sind, auf einer Außenfläche einer Litze (12) des Bewehrungskabels (14) zu passen, wobei jeder Keil (100) eine Außenfläche (105) mit einer darauf gebildeten Umfangsrille (103) beinhaltet,
    wobei die Rille (103) in einer Ebene im Wesentlichen senkrecht zu der Längsachse der Litze (12) positioniert ist; und
    einen Keilring (101, 101'), wobei der Keilring (101, 101') dafür ausgelegt ist, in die Rille jedes Keils (100) zu passen, um die Keile (100) miteinander zu verbinden und die Keile (100) an der Litze (12) zu halten, wobei der Keilring (101, 101') eine Lücke beinhaltet;
    wobei die Keilring- (101, 101') Lücke mit einem Raum zwischen den Keilen (100) fluchtet, so dass die Keilanordnung von der Seite der Litze (12) aus installiert werden kann.
  2. Keilanordnung nach Anspruch 1, wobei der Keilring (101, 101') dafür ausgelegt ist, mit der Rille (103) in einer Richtung im Wesentlichen senkrecht zu der Längsachse der Litze (12) verbunden zu sein.
  3. Keilanordnung nach Anspruch 1 oder Anspruch 2, umfassend zwei Keile (100).
  4. Keilanordnung nach einem der Ansprüche 1 bis 3, wobei der Keilring (101, 101') ferner ein Ausdehnungsmerkmal (109) umfasst, das an jedem Ende des Keilrings (101, 101') positioniert ist, wobei das Ausdehnungsmerkmal (109) dafür ausgelegt ist, zu bewirken, dass sich die Lücke ausdehnt, während der Keilring (101, 101') auf den Keil (100) installiert wird; wahlweise,
    wobei das Ausdehnungsmerkmal (109) umfasst:
    einen Zurückbiegungsabschnitt; und/oder
    ein Loch, das für die Wirkverbindung mit einer Sprengringzange ausgelegt ist.
  5. Verfahren zum Installieren der Keilanordnung nach Anspruch 1 auf eine Litze, wobei das Verfahren umfasst:
    Bereitstellen eines Ankers (10) zum nachträglichen Spannen von Beton;
    Durchfädeln einer Litze (12) durch den Anker (10);
    Bereitstellen mindestens zweier Keile (100), wobei jeder Keil (100) eine Außenfläche mit einer darauf gebildeten Umfangsrille (103) beinhaltet, wobei die Rille (103) in einer Ebene im Wesentlichen senkrecht zu der Längsachse der Litze (12) positioniert ist;
    Bereitstellen eines Keilrings (101, 101'), wobei der Keilring (101, 101') dafür ausgelegt ist, in die Rille (103) jedes Keils (100) zu passen und den Keil (100) an einer Litze (12) zu halten, wobei der Keilring (101, 101') eine Lücke beinhaltet, die dafür ausgelegt ist, dass der Keilring (101, 101') in die Rille (103) des Keils (100) installiert werden kann;
    Installieren des Keilrings (101, 101') in die Rille (103) der Keile (100) durch Ausdehnen der Lücke des Keilrings (101, 101') und Positionieren des Keilrings (101, 101') in die Rille (103), um so den Keilring (101, 101') mit den Keilen (100) zu verbinden; und
    Installieren der verbundenen Keile (100) und des Keilrings (101, 101') an der Litze (12) in einer Richtung senkrecht zu der Längsachse der Litze (12).
  6. Verfahren nach Anspruch 5, wobei die Keilring- (101, 101') Lücke mit einem Raum zwischen den Keilen (100) fluchtet.
  7. Keilanordnung nach Anspruch 1, wobei: der Keilring (101, 101') die Keile (100) an der Litze (12) hält und dabei eine Spielpassung zwischen den Keilen (100) und der Litze (12) erlaubt ist, wenn die Keile (100) an der Litze (12) installiert sind.
  8. Keilanordnung nach Anspruch 1 oder Anspruch 7, wobei der Keilring (101, 101') ferner einen oder mehrere Haken (115) umfasst, die dafür ausgelegt sind, einen Radialraum zwischen den Keilen (100) und der Litze (12) elastisch beizubehalten, um die Spielpassung auf der Litze (12) aufrechtzuerhalten; wahlweise,
    wobei, nach Installation an dem Anker (10), sich die Keile (100) mit der Außenfläche der Litze (12) verbinden.
  9. Verfahren nach Anspruch 6, wobei:
    der Keilring (101, 101') dafür ausgelegt ist, in die Rillen der Keile (100) zu passen und die Keile (100) an der Litze (12) zu halten dabei eine Spielpassung zwischen den Keilen (100) und der Litze (12) erlaubt ist, wenn die Keile (100) an der Litze (12) installiert sind; und
    ferner beinhaltend das Aufrechterhalten der Spielpassung zwischen den Keilen (100) und der Litze (12), wenn die Keile (100) an der Litze (12) installiert sind.
  10. Verfahren nach Anspruch 9, wobei der Keilring (101, 101'):
    ferner einen oder mehrere Haken (115) umfasst, die dafür ausgelegt sind, einen Radialraum zwischen den Keilen (100) und der Litze (12) elastisch beizubehalten, um die Spielpassung aufrechtzuerhalten; wahlweise,
    wobei, nach Installation an dem Anker (10), sich die Keile (100) mit der Außenfläche der Litze (12) verbinden; und/oder,
    ferner eine Lücke umfasst, die dafür ausgelegt ist, dass die Keile (100) neben der Lücke sich trennen können, wodurch die Keile (100) an der Litze (12) in einer Richtung senkrecht zu der Längsachse der Litze (12) installiert werden können.
  11. Keilanordnung nach Anspruch 1, wobei:
    mindestens ein Keil (100) eine darin gebildete Führung (111) beinhaltet, wobei die Führung (111) dafür ausgelegt ist, die Trennung der Keile (100) zu unterstützen, wenn die Keile (100) an der Litze (12) von der Seite der Litze (12) aus installiert werden; und
    wobei die Keilring- (101, 101') Lücke nahe der Führung positioniert ist, so dass die Trennung der Keile (100) den Keilring (101, 101') im Wesentlichen elastisch ausdehnt.
  12. Keilanordnung nach Anspruch 11, wobei:
    der Keilring (101, 101') dafür ausgelegt ist, mit der Rille (103) in einer Richtung im Wesentlichen senkrecht zu der Längsachse der Litze (12) verbunden zu sein; und/oder,
    ein Keil (100) nahe der Lücke eine Führung (111) beinhaltet; und/oder,
    beide Keile (100) nahe der Lücke Führungen (111) beinhalten; und/oder,
    die Führung (111) eine oder mehrere Fasen, Rampen, Kurven, Kehlen oder Kombinationen davon umfasst.
  13. Verfahren nach Anspruch 6, wobei:
    mindestens ein Keil (100) eine darin gebildete Führung (111) umfasst, wobei die Führung (111) dafür ausgelegt ist, die Trennung der Keile (100) zu unterstützen, wenn die Keile (100) von der Seite der Litze (12) aus an der Litze (12) installiert werden; und
    wobei die Keilring- (101, 101') Lücke nahe der Führung (111) positioniert ist, so dass die Trennung des Keilrings (101, 101') den Keilring (101, 101') im Wesentlichen elastisch ausdehnt;
    Ausrichten der Keilanordnung mit der Führung (111), so dass die Führung (111) mit der Litze (12) fluchtet;
    Pressen der Führung (111) gegen die Litze (12), so dass die Keile (100) getrennt werden und die Lücke ausgedehnt wird und der Keilring (101, 101') sich elastisch ausdehnt, während der Keilring (101, 101') auf der Litze (12) installiert wird.
  14. Verfahren nach Anspruch 13, wobei:
    ein Keil (100) nahe der Lücke eine Führung (111) beinhaltet; und/oder,
    beide Keile (100) nahe der Lücke Führungen (111) beinhalten; und/oder,
    die Führung (111) eine oder mehrere Fasen, Rampen, Kurven, Kehlen oder Kombinationen davon umfasst.
EP16179904.4A 2015-07-17 2016-07-18 Keil für nachträgliches spannen von bewehrungskabeln Active EP3118386B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US201562193883P 2015-07-17 2015-07-17
US201562193866P 2015-07-17 2015-07-17
US201562193898P 2015-07-17 2015-07-17
US14/838,779 US9874016B2 (en) 2015-07-17 2015-08-28 Wedge for post tensioning tendon
PCT/US2015/047389 WO2017014796A1 (en) 2015-07-17 2015-08-28 Wedge for post tensioning tendon

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Publication Number Publication Date
EP3118386A1 EP3118386A1 (de) 2017-01-18
EP3118386B1 true EP3118386B1 (de) 2021-08-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12018488B2 (en) * 2020-02-27 2024-06-25 Post Tech Manufacturing, Llc Systems and methods for concrete support post-tensioning

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070014630A1 (en) * 2005-03-14 2007-01-18 Brown David A Shrinkage-compensating continuity system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB804530A (en) * 1955-09-22 1958-11-19 Stressteel Corp Improvements in wedge anchors
EP0659976A3 (de) * 1993-12-23 1995-09-27 Rsc Mining Proprietary Limited Gebirgsanker.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070014630A1 (en) * 2005-03-14 2007-01-18 Brown David A Shrinkage-compensating continuity system

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