EP3127630B1 - Kaltstauchgeformter keil zur verwendung in vorgespanntem beton - Google Patents

Kaltstauchgeformter keil zur verwendung in vorgespanntem beton Download PDF

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Publication number
EP3127630B1
EP3127630B1 EP16180573.4A EP16180573A EP3127630B1 EP 3127630 B1 EP3127630 B1 EP 3127630B1 EP 16180573 A EP16180573 A EP 16180573A EP 3127630 B1 EP3127630 B1 EP 3127630B1
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EP
European Patent Office
Prior art keywords
wire
wedge
strand
cold heading
blank
Prior art date
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Active
Application number
EP16180573.4A
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English (en)
French (fr)
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EP3127630A1 (de
Inventor
Felix L. Sorkin
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Individual
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Priority claimed from PCT/US2015/061320 external-priority patent/WO2017023350A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/022—Special design or construction multi-stage forging presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • 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, cause the wedges to further engage the strand. Wedges are typically made of metal.
  • EP2151289 discloses a method involves separating a blank from a bundle of wire by scissors, and planar dipping of the blank front faces by setting. The method involves combining cup impact extrusion, punching, hollow backward pressing, forming a circumferential ring groove by tossing and reducing rolling edges.
  • the wire is a steel wire.
  • US4362421 discloses an anchor for use in the post-tensioning of prestressed concrete, including an anchor case having a longitudinally tapering outer wall surface and a tapered longitudinal bore for receiving a chuck comprising wedge segments which are in gripping engagement with a tendon passing therebetween.
  • the anchor case and chuck are approximately the same length, and the anchor case is cold forged with the top end thereof folded inwardly to effect greater thickness at that point, which structure, in combination with a dome-shape thrust plate extending outwardly from the outer periphery of the anchor case proximate the folded portion thereof, contains the hoop forces exerted on the anchor case by the chuck.
  • the present disclosure provides for a method for forming a wedge for post tensioning concrete, according to the subject-matter of claim 1.
  • the present disclosure further provides for dependent methods according to the depending claims.
  • 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 threaded through anchor 10.
  • 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. During use, wedges 100 may be installed to the strand in a direction perpendicular to the longitudinal axis of the strand. 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 formed by cold heading.
  • FIG. 2 depicts a block diagram of a cold heading process.
  • Wire 101 is provided on spool 103.
  • Wire 101 is fed by one or more drive wheels (not shown) into cold heading apparatus 105.
  • cold heading apparatus 105 may include straightening apparatus 107 which may include a plurality of rollers adapted to straighten wire 101 as it enters cold heading apparatus 105.
  • Wire 101 may be fed to forming dies 109.
  • Forming dies 109 reshape a portion of wire 101 progressively into the final form of one or more wedge blanks 113.
  • a portion of wire 101 is separated 111 from the rest of wire 101, separating the one or more formed wedge blanks 113.
  • FIGS. 3A-D depict the cold heading operation as a 3-step operation, but one having ordinary skill in the art with the benefit of this disclosure will understand that any number of operations may be undertaken to cold head wedge blanks 113.
  • the following discussion is merely exemplary of a cold heading operation consistent with at least one embodiment of the present disclosure.
  • wire 101 is fed through forming die 109a.
  • Wire portion 115 is formed between forming die 109a and 109b to initially reshape wire portion 115.
  • a portion of wire 101 is separated from wire 101 at this stage by, for example, shear cutter 117 to be formed into wedge blank 113.
  • forming dies 109c, 109d further refine the shape of wire portion 115.
  • two wedge blanks 113 are formed simultaneously from wire portion 115.
  • any number of wedge blanks 113 may be formed from wire portion 115. As depicted in FIG.
  • forming dies 109e, 109f further refine the shape of wedge blanks 113 into the final cold headed form shown in FIG. 3D .
  • forming dies 109a-f may operate by stamping, swaging, punching, forging, extruding, upsetting, or a combination thereof.
  • wedge blanks 113 may emerge from the cold heading process in a final form requiring no additional treatment.
  • wedge blanks 113 may be further processed as shown in FIG. 2 as further treatment 119.
  • wedge blanks 113 may be tumbled or otherwise polished to improve their surface finish.
  • wedge blanks 113 may be given a surface treatment or may be heat treated, hardened, or tempered.
  • wedge blanks 113 may be further machined to, for example and without limitation, add grooves.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Forging (AREA)

Claims (13)

  1. Verfahren zum Formen eines Keils (100) für Vorspannbeton, umfassend:
    Bereitstellen eines Drahtes (101);
    Speisen eines Abschnitts des Drahtes (101) in eine Kaltstauchvorrichtung;
    Kaltstauchen eines Abschnitts des Drahtes (101), um zumindest einen Keilrohling (113) zu formen;
    und
    Fertigstellen des Keilrohlings (113), um den Keil (100) zu formen;
    wobei das Kaltstauchen eines Abschnitts des Drahtes (101), um zumindest einen Keilrohling (113) zu formen, umfasst:
    Speisen des Abschnitts des Drahtes (101) zwischen ein erstes und zweites Umformwerkzeug (109a, 109b);
    Umformen des Drahtabschnitts (101) durch das erste und zweite Umformwerkzeug (109a, 109b); und
    Trennen des umgeformten Abschnitts des Drahtes vom Draht (101), um zumindest einen Keilrohling (113) zu formen.
  2. Verfahren nach Anspruch 1, wobei das Umformen des Drahtabschnitts (101) durch das erste und zweite Umformwerkzeug (109a, 109b) eins oder mehrere von Stempeln, Kalthämmern, Stanzen, Schmieden, Extrudieren oder Stauchen des Drahtabschnitts (101) umfasst.
  3. Verfahren nach Anspruch 1 oder Anspruch 2, das ferner das Umformen des Drahtabschnitts (101) durch ein drittes und viertes Umformwerkzeug (109c, 109d) umfasst.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei das Fertigstellen des Keilrohlings (113) zum Formen des Keils (100) eins oder mehrere von Putzen in Trommeln, Polieren, Wärmebehandlung, Härtung, Glühen, Riffelung oder Oberflächenbehandlung des Keilrohlings (113) umfasst.
  5. Verfahren nach einem der Ansprüche 1 bis 4, wobei der Prozess der Speisung des Drahtes (101) zur Kaltstauchvorrichtung von einem oder mehreren Antriebsrädern durchgeführt wird; optional, wobei die Kaltstauchvorrichtung ferner einen Richtapparat einschließt, wobei der Richtapparat eine Vielzahl von Rollen einschließt.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei die zwei Keilrohlinge (113) gleichzeitig geformt werden.
  7. Verfahren nach einem der Ansprüche 1 bis 6, das ferner die Bearbeitung der Keilrohlinge (113) zum Formen von Nuten umfasst.
  8. Verfahren nach Anspruch 1, ferner umfassend:
    Bereitstellen eines Ankers (10) für vorgespannten Beton;
    Fädeln eines Drahtes (12) durch den Anker (10); und
    Positionieren des Keils (100) auf dem Draht (12).
  9. Verfahren nach Anspruch 8, wobei das Positionieren des Keils (100) auf dem Draht (12) in einer Richtung senkrecht zur Längsachse des Drahtes (12) geschieht.
  10. Verfahren nach Anspruch 8 oder 9, wobei das Umformen des Drahtabschnitts (101) durch das erste und zweite Umformwerkzeug (109a, 109b) eins oder mehrere von Stempeln, Kalthämmern, Stanzen, Schmieden, Extrudieren oder Stauchen des Drahtabschnitts (101) umfasst; optional ferner das weitere Umformen des Drahtabschnitts (101) durch ein drittes und viertes Umformwerkzeug (109c, 109d) umfasst.
  11. Verfahren nach einem der Ansprüche 8 bis 10, wobei das Fertigstellen des Keilrohlings (113) zum Formen des Keils (100) eins oder mehrere von Putzen in Trommeln, Polieren, Wärmebehandlung, Härtung, Glühen, Riffelung oder Oberflächenbehandlung des Keilrohlings (113) umfasst.
  12. Verfahren nach einem der Ansprüche 8 bis 11, das ferner das Bewegen des Keils (100) in eine konische Vertiefung umfasst; optional, ferner die Anwendung einer Greifkraft unter Verwendung der Keile (100) am Draht (12) umfasst.
  13. Verfahren nach einem der Ansprüche 9 bis 12, wobei die Keile (100) Nuten aufweisen.
EP16180573.4A 2015-08-04 2016-07-21 Kaltstauchgeformter keil zur verwendung in vorgespanntem beton Active EP3127630B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201562200994P 2015-08-04 2015-08-04
PCT/US2015/061320 WO2017023350A1 (en) 2015-08-04 2015-11-18 Cold heading formed wedge for use in post tensioning concrete
US14/944,793 US20170036262A1 (en) 2015-08-04 2015-11-18 Cold heading formed wedge for use in post tensioning concrete

Publications (2)

Publication Number Publication Date
EP3127630A1 EP3127630A1 (de) 2017-02-08
EP3127630B1 true EP3127630B1 (de) 2020-03-18

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975906C (de) * 1948-02-16 1962-11-29 Carl Abraham Forssell Verankerung fuer Bewehrungsstaebe in Beton
US4362421A (en) * 1980-03-17 1982-12-07 Kelly William F Anchor for use in the post-tensioning of prestressed concrete
JP2006255778A (ja) * 2005-03-14 2006-09-28 Sakamura Mach Co Ltd 座金とボルトの同時圧造方法
EP2151289B1 (de) * 2008-08-09 2010-03-31 Presswerk Krefeld GmbH & Co. KG Verfahren zur Herstellung eines Gehäuserings

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EP3127630A1 (de) 2017-02-08

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