EP3375949B1 - System für nachgespanntes betonelement - Google Patents

System für nachgespanntes betonelement Download PDF

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Publication number
EP3375949B1
EP3375949B1 EP18166866.6A EP18166866A EP3375949B1 EP 3375949 B1 EP3375949 B1 EP 3375949B1 EP 18166866 A EP18166866 A EP 18166866A EP 3375949 B1 EP3375949 B1 EP 3375949B1
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EP
European Patent Office
Prior art keywords
pocket
strand
cap
former
keyway
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Active
Application number
EP18166866.6A
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English (en)
French (fr)
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EP3375949A1 (de
Inventor
Felix L. Sorkin
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Individual
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Individual
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Priority claimed from US15/226,334 external-priority patent/US9869091B2/en
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Publication of EP3375949A1 publication Critical patent/EP3375949A1/de
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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 anchors and systems for use therein.
  • Many structures are built using concrete, including, for instance, buildings, parking structures, apartments, condominiums, hotels, mixed-use structures, casinos, hospitals, medical buildings, government buildings, research/academic institutions, industrial buildings, malls, roads, bridges, pavement, tanks, reservoirs, silos, sports courts, and other structures.
  • Prestressed concrete is structural concrete in which internal stresses are introduced to reduce potential tensile stresses in the concrete resulting from applied loads; prestressing may be accomplished by post-tensioned prestressing or pre-tensioned prestressing.
  • prestressing may be accomplished by post-tensioned prestressing or pre-tensioned prestressing.
  • a tension member is tensioned after the concrete has attained a desired strength by use of a post-tensioning tendon.
  • the post-tensioning tendon may include for example and without limitation, anchor assemblies, the tension member, and sheathes.
  • a tension member is constructed of a material that can be elongated and may be a single or a multi-strand cable.
  • the tension member may be formed from a metal or composite material, such as reinforced steel.
  • the post-tensioning tendon conventionally includes an anchor assembly at each end.
  • the post-tensioning tendon is fixedly coupled to a fixed anchor assembly positioned at one end of the post-tensioning tendon, the "fixed-end”, and stressed at the stressed anchor assembly positioned at the opposite end of the post-tensioning tendon, the "stressing-end" of the post-tensioning tendon.
  • Post-tension members are conventionally formed from a strand and a sheath.
  • the strand is conventionally formed as a single or multi-strand metal cable.
  • the strand is conventionally encapsulated within a polymeric sheath extruded thereabout to, for example, prevent or retard corrosion of the metal strand by protecting the metal strand from exposure to corrosive or reactive fluids.
  • the sheath may prevent or retard concrete from bonding to the strand and preventing or restricting movement of the sheath during post-tensioning.
  • the sheath may be filled with grease to further limit the exposure of the metal strand and allow for increased mobility.
  • US4773198 A discloses tendon anchors that include forward and rear connection means for fluid-resistant connection to adjacent members.
  • US4616458 A discloses a protective apparatus for tendons in tendon tensioning assemblies.
  • NL7004097 A discloses an anchor body for adjusting tensioning elements.
  • US5024032 A discloses a post tensioning anchor assembly comprising a tapered tubular member, cable cap and anchoring plate assembly.
  • US5347777A discloses a post tensioning anchor plate assembly comprising an anchor plate and coupling elements therefor.
  • a system for post tensioning a concrete member (40) comprising:
  • the present invention provides for a system for post tensioning a concrete member.
  • the system includes an anchor body, and a strand, the strand inserted through the anchor body.
  • the strand has a strand end and an outer diameter.
  • the system also includes a pocket cap, the pocket cap positioned around the strand.
  • the pocket cap has a cylindrical interior wall, the cylindrical interior wall having a pocket cap diameter corresponding to the outer diameter of the strand.
  • the present disclosure also provides for a method of forming a post-tensioned concrete member, however the method does not form part of the present invention.
  • the method includes positioning a post-tensioning tendon within a concrete form, the post-tensioning tendon including a tension member, fixed anchor, and a stressing end anchor.
  • the tension member includes a strand.
  • the method also includes positioning a pocket former between the stressing end anchor and the concrete form.
  • the pocket former is coupled to the stressing end anchor, where the stressing end anchor has a stressing end anchor body.
  • the method additionally includes pouring concrete into the concrete form thereby forming a concrete member and encasing the post-tensioning tendon and pocket former in the concrete member.
  • the method includes forming a cavity in the concrete by removing the pocket former, the cavity corresponding to the outer shape of the pocket former.
  • the cavity has a cavity surface.
  • the method also includes coupling a pocket cap to the cavity surface.
  • post-tensioning tendon 11 may be positioned within concrete form 21.
  • Concrete form 21 is a form into which concrete may be poured to form concrete member 40.
  • Post-tensioning tendon 11 may include for example and without limitation fixed end anchor 13, tension member 15, and stressing end anchor 17.
  • fixed end anchor 13 may include fixed end anchor body 14.
  • Fixed-end anchor body 14 is positioned within concrete form 21 such that fixed-end anchor body 14 will be encased in concrete 23 after concrete is poured into concrete form 21.
  • fixed end cap 19 may be positioned at distal end 41 of fixed end anchor body 14.
  • Fixed end cap 19 may, in certain aspects of the present disclosure, protect tension member 15 from corrosion after concrete 23 is poured by preventing or retarding corrosive or reactive fluids or concrete from contacting tension member 15.
  • tension member 15 may include strand 27 and sheath 29.
  • Strand 27 may be a single or multi-strand metal cable.
  • Sheath 29 may be tubular or generally tubular and may be positioned about strand 27.
  • space between strand 27 and sheath 29 may be filled or partially filled with a filler such as grease.
  • a length of sheath 29 may be removed from first end 43 of tension member 15, exposing strand 27.
  • Strand 27 may be inserted through fixed end anchor body 14 and secured thereto, for example and without limitation, by one or more wedges. After strand 27 is secured, fixed end anchor body 14 may be installed in concrete form 21.
  • Tension member 15 may be positioned within concrete form 21 and tension member 15 may be cut to correspond with the length of concrete form 21.
  • a length of sheath 29 may be removed from second end 44 of tension member 15, exposing strand 27.
  • Strand 27 may be inserted through stressing end anchor body 18. After insertion of strand 27 through stressing end anchor body 18, stressing end anchor 17 may be positioned within concrete form 21.
  • End wall 22 may include strand aperture 45 through which strand 27 may extend.
  • Pocket former 100 may be positioned between stressing end anchor body 18 and end wall 22 of concrete form 21. Pocket former 100 does prevent or restrict concrete 23 from filling the space between stressing end anchor body 18 and end wall 22, thus forming a cavity or pocket in edge 42 of concrete member 40 formed by concrete 23 within concrete form 21. Pocket former 100 may thus allow access to tension member 15 from outside concrete member 40 once concrete member 40 is sufficiently hardened and end wall 22 is removed.
  • stressing end anchor assembly refers to the combination of stressing end anchor 17, pocket former 100, and, as described hereinbelow, pocket cap 103.
  • pocket former 100 does include pocket former body 101.
  • pocket former body 101 may include a coupler for coupling pocket former 100 to stressing end anchor 17.
  • pocket former body 101 may be hollow.
  • pocket former body 101 may be a cylindrical or generally cylindrical member. Pocket former body 101 may be any shape suitable for providing a pocket in concrete 23 to allow access to the end of tension member 15 including, but not limited to, cylindrical, frustoconical, prismatoidal, ellipsoidal, or any combination thereof.
  • pocket former body 101 may be any shape including, but not limited to, square, round, oblong, ovate, ellipsoidal, triangular, polyhedral, or any combination thereof.
  • pocket former body 101 is frustoconical or otherwise tapered from pocket former outer edge 120 to pocket former inner edge 130.
  • pocket former body 101 is tapered from pocket former outer edge 120 to pocket former inner edge 130.
  • removal of pocket former body 101 from concrete 23 may be accomplished more easily than a non-tapered pocket former body.
  • cavity 101' is formed in concrete 23.
  • the shape of cavity 101' does correspond with the outside shape of pocket former body 101.
  • the pocket former 100 does include keyway former 102.
  • Keyway former 102 is annular or generally annular and positioned on outer tapered surface 140 of pocket former body 101. As depicted in FIG. 2A , the keyway former 102 does extend radially outwardly from outer tapered surface 140 of pocket former body 101. As depicted in FIG. 2B , when keyway former 102 is removed from concrete 23, keyway 102' is formed in concrete 23. Keyway 102' is a cavity within concrete 23. The shape of keyway 102' does, correspond with the outside shape of keyway former 102
  • the pocket cap 103 may be positioned around strand 27. Pocket cap 103 may cover cavity 101' and prevent or restrict fluid intrusion thereinto. Pocket cap 103 may be positioned between cavity 101' and strand 27. In some aspects of the present disclosure, pocket cap 103 may be annular or generally annular. Pocket cap 103 will couple to keyway surface 102" by one or more extensions adapted to fit into keyway 102'. The pocket cap 103 does include one or more extensions 107 that couple pocket cap 103 to keyway surface 102" as depicted in FIG. 2C . As depicted in FIG. 3 , cavity 101' may include cylindrical section 105 and frustoconical section 106.
  • pocket cap 103 may fit within cylindrical section 105 by, for example and without limitation, a friction or press fit.
  • cylindrical section 105 may instead be tapered inwardly or outwardly.
  • Surface 23' of concrete 23 in cavity 101' may, for example, be rough enough to retain pocket cap 103 therewithin without locking members.
  • pocket cap 103 may be filled with a filler such as grease 111.
  • Grease 111 may, for example and without limitation, prevent or restrict corrosive or reactive fluids from contacting strand 27.
  • Grease 111 may be positioned within pocket cap 103 before pocket cap 103 is installed to cavity 101'.
  • strand end 170 of strand 27 may pass through pocket cap 103.
  • the pocket cap 103 has a cylindrical or generally cylindrical interior wall 113 having a pocket cap diameter 150 generally corresponding to strand outer diameter 160.
  • grease 111 may be positioned along cylindrical interior wall 113.
  • cylindrical interior wall 113 may terminate in end flange 115. End flange 115 may retain grease 111 within pocket cap 103.
  • one or more seals 117 may be positioned between cylindrical interior wall 113 and strand 27 to retain grease 111 within pocket cap 103.
  • pocket cap 103 may enclose strand end 170 of strand 27.
  • Pocket cap 103 may include cap end wall 119 positioned to retain grease 111 within pocket cap 103.
  • gasket 109 as depicted in FIG. 3 may seal between stressing end anchor body 18 and pocket cap 103. Gasket 109 may be compressed between stressing end anchor body 18 and pocket cap 103. Gasket 109 may be formed from an elastic material such as rubber.
  • Post-tensioning tendon 11 may be positioned within concrete form 21 as depicted in FIG. 1A .
  • Pocket former 100 of stressing end anchor 17 may be positioned such that pocket former 100 is in contact with end wall 22.
  • Concrete 23, as depicted in FIG. 1B may be poured into concrete form 21 and allowed to set. End wall 22 of concrete form 21 may be removed.
  • Pocket former 100 and, keyway former 102 are removed from cavity 101' as depicted in FIG. 2A .
  • a pocket cap 103 is placed within cavity 101. Pocket cap 103 may remain coupled to keyway surface 102" until access to strand 27 is desired, such as, for example, when strand 27 is to be post-tensioned; pocket cap 103 may be decoupled and removed to access strand 27.
  • pocket cap 103 may be removed from cavity 101', as depicted in FIG. 2B , by mechanical action.
  • Pocket cap 103 may be formed by, for example and without limitation, injection molding, milling, turning, or casting. Pocket cap 103 may be formed as a single unit or may include multiple components.

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

Claims (7)

  1. System zum Nachspannen eines Betonelements (40), umfassend:
    einen Ankerkörper (14, 18);
    einen Aussparungsformer (100), der abnehmbar mit dem Ankerkörper (14, 18) verbunden und dafür konfiguriert ist, in dem Betonelement (40) einen Aussparungshohlraum (101') um den Ankerkörper (14, 18) zu formen, wobei der Aussparungsformer (100) einen Aussparungsformerkörper (101) umfasst;
    eine Litze (27), wobei die Litze (27) durch den Ankerkörper (14, 18) eingeführt wird, wobei die Litze (27) ein Litzenende (170) und einen Außendurchmesser (160) aufweist;
    eine Aussparungsabdeckung (103), wobei die Aussparungsabdeckung (103) dafür konfiguriert ist, um die Litze (27) positioniert zu sein und den Aussparungshohlraum (101') mittels Reib- oder Presspassung in Eingriff zu nehmen, wobei die Aussparungsabdeckung (103) eine zylindrische Innenwand (113) aufweist, wobei die Aussparungsabdeckung (103) dafür ausgelegt ist, Fluidzugang zu dem Punkt, wo sich die Litze (27) von dem Ankerkörper (14, 18) erstreckt, einzuschränken;
    wobei die Außenfläche (140) des Aussparungsformers (100) einen ringförmigen Keilnutformer (102) umfasst, der sich radial nach außen von der äußeren Kegelfläche (140) des Aussparungsformerkörpers (101) erstreckt;
    wobei der Keilnutformer (102) eine Keilnut (102') in dem Betonelement (40) formt, wenn der Keilnutformer (102) aus dem Betonelement (40) entfernt wird;
    wobei die Form der Keilnut (102') der Außenform des Keilnutformers (102) entspricht; und
    wobei die Aussparungsabdeckung eine oder mehrere Verlängerungen (107) aufweist, die die Aussparungsabdeckung (103) mit einer Keilnutoberfläche (102") verbinden.
  2. System nach Anspruch 1, wobei der Aussparungsformer (100) dafür konfiguriert ist, einen Aussparungshohlraum (101') zu formen, der einen zylindrischen Abschnitt und einen kegelstumpfförmigen Abschnitt aufweist, und wobei die Aussparungsabdeckung (103) den zylindrischen Abschnitt des Aussparungshohlraums (101') mittels Reib- oder Presspassung in Eingriff nimmt.
  3. System nach Anspruch 1, wobei die Litze (27) durch die Aussparungsabdeckung (103) verläuft.
  4. System nach Anspruch 1 oder 3, wobei die Aussparungsabdeckung (103) eine zylindrische oder generell zylindrische Innenwand (113) aufweist und die zylindrische Innenwand (113) in einem Endflansch (115) endet.
  5. System nach Anspruch 1, wobei die Aussparungsabdeckung (103) eine abdeckungsseitige Wand (119) beinhaltet und das Litzenende (170) umschließt.
  6. System nach einem der Ansprüche 1 bis 5, ferner umfassend eine oder mehrere Dichtungen (117), die zwischen der zylindrischen Innenwand (113) und der Litze (27) positioniert sind.
  7. System nach einem der Ansprüche 1 bis 6, wobei die Aussparungsabdeckung (103) Fett zwischen der Aussparungsabdeckung (103) und der Litze (27) enthält.
EP18166866.6A 2015-08-04 2016-08-03 System für nachgespanntes betonelement Active EP3375949B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201562200945P 2015-08-04 2015-08-04
US15/226,334 US9869091B2 (en) 2015-08-04 2016-08-02 Pocket cap for post-tensioned concrete member
PCT/US2016/045147 WO2017023922A1 (en) 2015-08-04 2016-08-02 Pocket cap for post-tensioned concrete member
EP16182614.4A EP3128096B1 (de) 2015-08-04 2016-08-03 Verfahren zum herstellen ein nachgespanntes betonelement

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP16182614.4A Division EP3128096B1 (de) 2015-08-04 2016-08-03 Verfahren zum herstellen ein nachgespanntes betonelement
EP16182614.4A Division-Into EP3128096B1 (de) 2015-08-04 2016-08-03 Verfahren zum herstellen ein nachgespanntes betonelement

Publications (2)

Publication Number Publication Date
EP3375949A1 EP3375949A1 (de) 2018-09-19
EP3375949B1 true EP3375949B1 (de) 2021-04-14

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EP18166866.6A Active EP3375949B1 (de) 2015-08-04 2016-08-03 System für nachgespanntes betonelement
EP16182614.4A Active EP3128096B1 (de) 2015-08-04 2016-08-03 Verfahren zum herstellen ein nachgespanntes betonelement

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Application Number Title Priority Date Filing Date
EP16182614.4A Active EP3128096B1 (de) 2015-08-04 2016-08-03 Verfahren zum herstellen ein nachgespanntes betonelement

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Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH482080A (de) * 1969-03-26 1969-11-30 Brandestini Antonio Ankerkörper für Spannglieder
DE8002045U1 (de) * 1980-01-26 1980-04-30 Dyckerhoff & Widmann Ag, 8000 Muenchen Wiedergewinnbares schalungsteil fuer den verankerungsbereich eines spannglieds in einem betonbauteil
US4616458A (en) * 1985-07-01 1986-10-14 Vsl Corporation Protective apparatus for tendons in tendon tensioning anchor assemblies
US4773198A (en) * 1986-09-05 1988-09-27 Continental Concrete Structures, Inc. Post-tensioning anchorages for aggressive environments
US5024032A (en) * 1987-08-24 1991-06-18 Alan Rodriguez Post-tensioning anchor
US5347777A (en) * 1993-04-23 1994-09-20 Post Tension Product Mfg., Inc. Anchor plate assembly
US5423362A (en) * 1993-10-12 1995-06-13 Knight; David W. Apparatus for forming an access pocket at the terminal end of a post-tensioned tendon
US7216842B2 (en) * 2004-08-12 2007-05-15 Lomont Molding, Inc. Pocket former
DE202008001248U1 (de) * 2008-01-28 2008-03-27 Dywidag-Systems International Gmbh Erd- oder Felsanker mit einem Ankerzugglied aus einem oder mehreren Einzelelementen mit korrosionsgeschützter Ankerkopfausbildung
US9062457B2 (en) * 2013-02-11 2015-06-23 Robert Gilling Assembly and method for anchoring rebar to a mass

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3375949A1 (de) 2018-09-19
EP3128096B1 (de) 2018-11-07
EP3128096A1 (de) 2017-02-08

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