EP3128095B1 - Nachgespannte spannglied und kopplungsverfahren - Google Patents

Nachgespannte spannglied und kopplungsverfahren Download PDF

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Publication number
EP3128095B1
EP3128095B1 EP16182610.2A EP16182610A EP3128095B1 EP 3128095 B1 EP3128095 B1 EP 3128095B1 EP 16182610 A EP16182610 A EP 16182610A EP 3128095 B1 EP3128095 B1 EP 3128095B1
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EP
European Patent Office
Prior art keywords
spindle
anchor
post
strand
sheath
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English (en)
French (fr)
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EP3128095A1 (de
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Felix L. Sorkin
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Individual
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Individual
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Priority claimed from US15/225,907 external-priority patent/US9896845B2/en
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Priority to EP18206011.1A priority Critical patent/EP3461964B1/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 a post tensioning tendon with anchors 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.
  • the thermal expansion and contraction rates of the metal strand and polymeric sheath may differ.
  • the sheaths are formed by hot extrusion over the metal strand.
  • uneven thermal contraction may occur as the tendon cools.
  • cooling of the sheath may cause separation of the sheath from an anchorage, potentially exposing the metal strand to corrosive or reactive fluids.
  • CH651619 discloses a recoverable formwork part for the anchoring area of a tension member anchorage in a concrete structural part with an anchor body which has a central passage for the tensioning member consisting of a tubular sleeve surrounding the tensioning member in the installed state with a cup-shaped recessed part which can be connected to the formwork of the concrete component, wherein the sleeve forms a guide for the tensioning member over a range of its length, the formwork at the outlet end of the tensioning member and can be fastened thereto, and in that the recess-forming part is arranged in the region of the entire length of the sleeve.
  • This document discloses the features of the preamble of claim 1.
  • US6393781 discloses a pocketformer apparatus for post-tension construction including an anchor member having a wedge-receiving cavity therein, a tubular member having a portion extending through the wedge-receiving cavity, a first securement member affixed to a first end of the tubular member, a cup member positioned over the tubular member, and a second securement member affixed to a second end of the tubular member.
  • the cup member is interposed between the second securement member and the anchor member.
  • the tubular member also extends through a hole in a form board.
  • the second securement member is positioned on one side of the form board.
  • the cup member and the anchor member are positioned on an opposite side of the form board. A tendon extends through the tubular member.
  • US8069624 discloses pocketformer apparatus for post-tension construction has an anchor member with an interior passageway, a tubular member extending into the interior passageway, a cup member with an interior opening in which the tubular member extends through the interior opening, and a securement member affixed adjacent the opposite end of the tubular member from the anchor body.
  • the interior passageway has a threaded portion.
  • the tubular member has a first end retained in the threaded portion.
  • the tubular member has the second end extending outwardly of a side of the anchor body opposite the threaded portion.
  • the cup member is interposed between the securement member and the anchor member.
  • a form board is interposed between the cup member and the securement member.
  • the threaded portion is an internal thread formed on an non-tapered portion of the interior passageway.
  • the present disclosure provides a post tensioning tendon according to claim 1.
  • the tendon comprises among several other features an anchor.
  • the anchor includes an anchor body, the anchor body having an internal passage, and a lock nut, the lock nut having an internal tapered surface defining a forcing cone.
  • the lock nut is coupled to the anchor body.
  • the anchor also includes a spindle, the spindle positioned within the internal passage and threadedly coupled to the lock nut.
  • the spindle has an expansion wedge.
  • the post-tensioning tendon includes a tension member including a strand and a sheath where the sheath is positioned about the strand.
  • the post-tensioning tendon also includes a first anchor coupled to a first end of the tension member and a second anchor coupled to a second end of the tension member.
  • Each of the anchors include an anchor body, the anchor body having an internal passage, and a lock nut, the lock nut having an internal tapered surface defining a forcing cone.
  • the lock nut is coupled to the anchor body.
  • the anchors also include a spindle, the spindle positioned within the internal passage and threadedly coupled to the lock nut. The spindle has an expansion wedge, and the sheath is gripped between the expansion wedge and the forcing cone.
  • the present disclosure provides for a method of coupling a tension member to an anchor for forming a post-tensioning tendon.
  • the method includes providing a tension member including a strand and a sheath, where the sheath is positioned about the strand.
  • the method also includes providing an anchor.
  • the anchor includes an anchor body, where the anchor body has an internal passage and a lock nut, the lock nut having an internal tapered surface defining a forcing cone.
  • the lock nut is coupled to the anchor body.
  • the anchor also includes a spindle, the spindle positioned within the internal passage and threadedly coupled to the lock nut.
  • the spindle has an expansion wedge, and the sheath is gripped between the expansion wedge and the forcing cone.
  • the method also includes removing a portion of a first end of the sheath from a first end of the tension member exposing a first end of the strand and inserting the first end of the tension member into the anchor.
  • the method includes inserting the first end of the strand through the spindle and inserting the sheath between the expansion wedge and the forcing cone.
  • the method also includes tightening the lock nut onto the spindle such that the sheath is compressed between the expansion wedge and the forcing cone and coupling the strand to the anchor.
  • anchoring systems may be provided to hold the tension member before and after stressing.
  • post-tensioning tendon 11 is 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 includes a fixed end anchor 13, tension member 15, and stressing end anchor 17.
  • fixed end anchor 13 includes 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 embodiments, 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.
  • Stressing end anchor 17 may include stressing end anchor body 18, positioned within concrete form 21 such that stressing end anchor body 18 is within concrete 23.
  • Pocket former 25 may be positioned between the end of stressing end anchor body 18 and end wall 22 of concrete form 21. Pocket former 25 may prevent or retard concrete 23 from filling space between stressing end anchor body 18 and concrete form edge 42 of the resultant concrete member 40 formed by concrete 23 within concrete form 21. Pocket former 25 may allow access to tension member 15 from outside concrete member 40 once concrete member 40 is hardened and concrete form 21 is removed.
  • stressing end anchor 17 and fixed end anchor 13 may be referred to as “first anchor” and “second anchor,” or vice versa.
  • the tension member 15 includes 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 is positioned about strand 27. In some embodiments, 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 is 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 is 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 is positioned within concrete form 21 such that pocket former 25 contacts end wall 22 of concrete form 21. End wall 22 may include strand aperture 45 through which strand 27 may extend.
  • sheath 29 is coupled to stressing end anchor body 18 and fixed end anchor body 14 to, for example and without limitation, prevent or restrict sheath 29 from pulling away from the respective anchors and exposing strand 27 to concrete 23.
  • the fixed end anchor 13 includes lock nut 101 and spindle 103.
  • stressing end anchor 17 includes lock nut 101 and spindle 105.
  • Spindles 103, 105 may be tubular or generally tubular members having cylindrical or generally cylindrical inner surfaces 134 defining spindle inner passages 136 through which strand 27 passes.
  • Spindles 103, 105 are positioned within internal passage 107 of the corresponding anchor bodies 14, 18.
  • the spindles 103, 105 include threads 109 to threadedly couple spindles 103, 105 to a respective lock nut 101.
  • spindles 103, 105 grip first end 43 and second end 44 of sheath 29 when coupled.
  • spindles 103, 105 include expansion wedge 111.
  • Expansion wedge 111 is positioned within first end 43 and second end 44 of sheath 29 and expand first end 43 and second end 44 radially outward as expansion wedge 111 is inserted.
  • lock nuts 101 include internal tapered surface 130 defining forcing cone 113 corresponding to expansion wedges 111 such that, as lock nuts 101 are tightened, expansion portion 132 of sheath 29 into which expansion wedge 111 is gripped between forcing cone 113 and expansion wedge 111.
  • one or both of expansion wedge 111 and forcing cone 113 may be smooth or may include a grip enhancing surface feature such as teeth, grooves, or any other grip enhancing surface features known in the art.
  • spindles 103, 105 may couple to fixed end anchor body 14 or stressing end anchor body 18 by tensile forces applied when lock nuts 101 are tightened thereonto.
  • spindles 103, 105 may include a retention feature.
  • the retention feature may transfer the tensile force onto fixed end anchor body 14 or stressing end anchor body 18 and prevent or restrict spindles 103, 105 from being pulled through fixed end anchor body 14 or stressing end anchor body 18.
  • the retention feature may be an edge, detent, extension, or, as depicted in FIG. 2 , conical retaining profile 115.
  • spindles 103, 105 may couple fixed end anchor body 14 or stressing end anchor body 18 to end wall 22 of concrete form 21.
  • spindle 105 includes spindle extension 106; spindle extension 106 may thread through strand aperture 45 in end wall 22 through which strand 27 extends.
  • spindle extension 106 may include external threads 117. External threads 117 may threadedly couple spindle extension 106 with spindle nut 119. Spindle nut 119 may allow stressing end anchor body 18 to be retained to end wall 22 during concrete pouring.
  • spindles 103, 105 may be left in fixed end anchor 13.
  • spindle 105 may be removed from stressing end anchor body 18 by unthreading spindle 105 from lock nut 101.
  • sheath 29 may no longer be retained between extended spindle 105 and lock nut 101 after concrete pouring, sheath 29 may be prevented from retracting from stressing end anchor body 18 by concrete 23.
  • concrete 23 surrounding sheath 29 may conform to surface irregularities of sheath 29 and may adhere thereto, thus preventing or restricting any contraction of sheath 29.
  • one or more seals may be positioned to prevent or restrict concrete 23 from ingressing into tension member 15 that may prevent or retard the tensioning of strand 27.
  • gasket 121 may be positioned between lock nut 101 and stressing end anchor body 18.
  • a spindle such as spindles 103, 105 may be utilized with either a fixed end anchor or stressing end anchor. Furthermore, a spindle such as spindles 103, 105 may be used with an intermediate anchor.
  • An intermediate anchor as understood in the art, may be an anchor used between adjacent concrete members which are poured and stressed sequentially utilizing the same tension member 15.
  • fixed end anchor 13 and stressing end anchor 17 are depicted as unencapsulated or bare anchors, such as those formed from ductile iron, fixed end anchor 13 and stressing end anchor 17 may be encapsulated-type anchors without deviating from the scope of this disclosure and may be formed from any material.
  • Non-limiting examples of encapsulated anchors are disclosed in US Patent Nos. 4,896,470 ; 5,072,558 ; 5,701,707 ; 5,749,185 ; 5,755,065 ; 6,098,356 ; 6,381,912 ; 6,560,939 ; 6,761,002 ; 6,817,148 ; 6,843,031 ; and 8,065,845 .
  • spindles 103, 105 may be formed from a nonconductive material such as a polymer. In some such embodiments, spindles 103, 105 may act to electrically insulate strand 27, fixed end anchor 13, and stressing end anchor 17. This electric insulation may prevent or retard galvanic corrosion from occurring due to contact between strand 27, fixed end anchor 13, or stressing end anchor 17 when strand 27, fixed end anchor 13, and stressing end anchor 17 are formed from different metals.

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

Claims (15)

  1. Nachgespanntes Spannglied (11), umfassend:
    ein Spannelement (15) umfassend eine Litze (27) und eine Ummantelung (29), wobei die Ummantelung (29) um die Litze (27) herum positioniert ist; und
    einen ersten Anker (13), der an ein erstes Ende (43) des Spannelements (15) gekoppelt ist, und einen zweiten Anker (17), der an ein zweites Ende (44) des Spannelements (15) gekoppelt ist, wobei jeder Anker (13, 17) umfasst:
    den Ankerkörper (14, 18) mit einem internen Durchgang (107);
    eine Kontermutter (101), wobei die Kontermutter (101) eine interne konische Oberfläche (130) aufweist, die einen Übergangskonus (113) definiert, wobei die Kontermutter (101) an den Ankerkörper (14, 18) gekoppelt ist; und
    eine Spindel (103, 105), wobei die Spindel (103, 105) innerhalb des internen Durchgangs (107) positioniert und mittels Gewinde an die Kontermutter (101) gekoppelt ist, wobei die Spindel (103, 105) einen Spreizkeil (111) aufweist, wobei das Spannglied (11) dadurch gekennzeichnet ist, dass:
    der Ankerkörper (14, 18) innerhalb einer Betonschalung (21) zu positionieren ist, sodass der Ankerkörper (14, 18) einbetoniert ist, nachdem Beton in die Betonschalung (21) gegossen wurde,
    worin die Ummantelung (29) zwischen dem Spreizkeil (111) und dem Übergangskonus (113) gegriffen wird und worin die konische Oberfläche (130), die den Übergangskonus (113) definiert, dem Spreizkeil (111) entspricht, sodass, während die Kontermutter (101) an der Spindel (103, 105) festgezogen wird, ein Spreizteil (132) der Ummantelung (29) zwischen dem Übergangskonus (113) und dem Spreizkeil (111) gegriffen wird.
  2. Nachgespanntes Spannglied (11) nach Anspruch 1, worin die Spindel (105) ferner eine Spindelverlängerung (106) umfasst, wobei die Spindelverlängerung (106) ein Außengewinde (117) aufweist, wobei das Außengewinde (117) mittels Gewinde die Spindelverlängerung (106) an eine Spindelmutter (119) koppelt.
  3. Nachgespanntes Spannglied (11) nach Anspruch 1 oder 2, worin jeder Anker (13, 17) ferner eine Dichtung (121) umfasst, die zwischen der Kontermutter (101) und dem Ankerkörper (14, 18) positioniert ist.
  4. Nachgespanntes Spannglied (11) nach einem der Ansprüche 1 bis 3, worin die Spindel (103, 105) ferner ein Rückhaltemerkmal umfasst, wobei das Rückhaltemerkmal eine Kante, eine Rastung, eine Verlängerung oder ein konisches Rückhalteprofil (115) ist.
  5. Nachgespanntes Spannglied (11) nach einem der Ansprüche 1 bis 4, worin der erste und zweite Anker (13, 17) einen Anker (13) mit eingespanntem Ende und einen Anker (17) mit vorgespanntem Ende umfassen.
  6. Nachgespanntes Spannglied (11) nach einem der Ansprüche 1 bis 5, worin mindestens einer des Spreizkeils (111) oder des Übergangskonus (113) ein den Halt verbesserndes Oberflächenmerkmal aufweist, worin das den Halt verbessernde Oberflächenmerkmal Zähne oder Nuten beinhaltet.
  7. Nachgespanntes Spannglied (11) nach einem der Ansprüche 1 bis 6, worin die Spindel (103, 105) aus einem nichtleitenden Material hergestellt ist.
  8. Nachgespanntes Spannglied (11) nach Anspruch 2, worin die Spindelverlängerung (106) mittels Gewinde durch einen Litzendurchlass (45) in einer Endwand (22) einer Betonschalung (21) geführt wird, wobei der Ankerkörper (18) durch die Spindelmutter (119) an die Endwand (22) gekoppelt ist.
  9. Nachgespanntes Spannglied (11) nach Anspruch 8, ferner umfassend einen Aussparungskörper (25), wobei der Aussparungskörper (25) zwischen dem Ankerkörper (14, 18) des ersten oder zweiten Ankers (13, 17) und der Endwand (22) positioniert ist.
  10. Nachgespanntes Spannglied (11) nach einem vorhergehenden Anspruch, ferner umfassend eine feste Endkappe (19), wobei die feste Endkappe (19) am distalen Ende entweder des ersten oder zweiten Ankers (13, 17) positioniert ist.
  11. Nachgespanntes Spannglied (11) nach einem vorhergehenden Anspruch, worin die Spindel (103, 105) und der Ankerkörper (14, 18) aus verschiedenen Materialien hergestellt sind.
  12. Verfahren zum Koppeln eines Spannelements (15) an einen Anker (13, 17) zum Herstellen eines nachgespannten Spannglieds (11) nach Anspruch 1, wobei das Spannglied umfasst:
    Bereitstellen eines Spannelements (15) umfassend eine Litze (27) und eine Ummantelung (29), wobei die Ummantelung (29) um die Litze (27) herum positioniert ist;
    Bereitstellen eines Ankers (13, 17);
    Entfernen eines Teils eines ersten Endes der Ummantelung (29) von einem ersten Ende des Spannelements (15), wodurch ein erstes Ende der Litze (27) freigelegt wird;
    Einführen des ersten Endes (43) des Spannelements (15) in den Anker (13, 17);
    Einführen des ersten Endes der Litze (27) durch die Spindel (103, 105);
    Einführen der Ummantelung (29) zwischen dem Spreizkeil (111) und dem Übergangskonus (113);
    Festziehen der Kontermutter (101) an der Spindel (103, 105), so dass die Ummantelung (29) zwischen dem Spreizkeil (111) und dem Übergangskonus (113) gestaucht wird; und
    Koppeln der Litze (27) an den Anker (13, 17).
  13. Verfahren nach Anspruch 12, worin die Spindel (105) ferner eine Spindelverlängerung (106) umfasst, die Spindelverlängerung (106) mittels Gewinde durch einen Litzendurchlass (45) in einer Endwand (22) einer Betonschalung (21) geführt wird, der Ankerkörper (14, 18) durch die Spindelmutter (119) an die Endwand (22) gekoppelt wird und worin das Verfahren ferner die folgenden Vorgänge umfasst:
    Positionieren der Spindelverlängerung (106) durch die Endwand (22);
    Drehen der Spindelmutter (119) auf die Spindelverlängerung (106), so dass der Ankerkörper (18) an die Endwand (22) gekoppelt wird.
  14. Verfahren nach Anspruch 13,
    ferner umfassend:
    Füllen der Betonschalung (21) mit Beton;
    Härten des Betons;
    Ausrücken der Spindel (103, 105) aus der Kontermutter (101); und
    Entfernen der Spindel (103, 105) von dem Ankerkörper (14, 18).
  15. Verfahren nach einem der Ansprüche 12 bis 14, ferner umfassend:
    elektrisches Isolieren der Litze (27) und des Ankers (13, 17) unter Verwendung der Spindeln (103, 105); und/oder,
    Positionieren von Dichtungen zwischen der Kontermutter (101) und dem Anker (13, 17); und/oder,
    Verhindern des Ziehens der Spindel (103, 105) durch den Ankerkörper (14, 18) unter Verwendung eines Rückhaltemerkmals (115).
EP16182610.2A 2015-08-04 2016-08-03 Nachgespannte spannglied und kopplungsverfahren Active EP3128095B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18206011.1A EP3461964B1 (de) 2015-08-04 2016-08-03 Spindelarretierungsanker für vorgespannte betonelemente

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US201562200918P 2015-08-04 2015-08-04
US15/225,907 US9896845B2 (en) 2015-08-04 2016-08-02 Spindle lock anchor for post tensioned concrete member
PCT/US2016/045085 WO2017023893A1 (en) 2015-08-04 2016-08-02 Spindle lock anchor for post tensioned concrete member

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP18206011.1A Division EP3461964B1 (de) 2015-08-04 2016-08-03 Spindelarretierungsanker für vorgespannte betonelemente
EP18206011.1A Division-Into EP3461964B1 (de) 2015-08-04 2016-08-03 Spindelarretierungsanker für vorgespannte betonelemente

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Publication Number Publication Date
EP3128095A1 EP3128095A1 (de) 2017-02-08
EP3128095B1 true EP3128095B1 (de) 2019-07-31

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109356631A (zh) * 2018-12-10 2019-02-19 北京交通大学 一种自检锚杆

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DE8002045U1 (de) * 1980-01-26 1980-04-30 Dyckerhoff & Widmann Ag, 8000 Muenchen Wiedergewinnbares schalungsteil fuer den verankerungsbereich eines spannglieds in einem betonbauteil
US5072558A (en) 1988-04-21 1991-12-17 Varitech Industries, Inc. Post-tension anchor system
US4896470A (en) 1988-04-21 1990-01-30 Varitech Industries, Inc. Tendon tensioning anchor
US5755065A (en) 1996-04-25 1998-05-26 Sorkin; Felix L. Method and apparatus for forming an anchorage of a post-tension system
US5749185A (en) 1996-04-25 1998-05-12 Sorkin; Felix L. Method and apparatus for an intermediate anchorage of a post-tension system
US5701707A (en) 1996-05-06 1997-12-30 Sorkin; Felix L. Bonded slab post-tension system
US6098356A (en) 1998-11-03 2000-08-08 Sorkin; Felix L. Method and apparatus for sealing an intermediate anchorage of a post-tension system
US6393781B1 (en) * 2000-03-13 2002-05-28 Felix L. Sorkin Pocketformer apparatus for a post-tension anchor system and method of using same
US6817148B1 (en) 2000-08-28 2004-11-16 Felix L. Sorkin Corrosion protection seal for an anchor of a post-tension system
US6381912B1 (en) 2000-12-29 2002-05-07 Felix L. Sorkin Apparatus and method for sealing an intermediate anchor of a post-tension anchor system
US6560939B2 (en) 2001-03-19 2003-05-13 Felix L. Sorkin Intermediate anchor and intermediate anchorage system for a post-tension system
US6761002B1 (en) 2002-12-03 2004-07-13 Felix L. Sorkin Connector assembly for intermediate post-tension anchorage system
US6843031B1 (en) 2003-07-17 2005-01-18 Felix L. Sorkin Bonded monostrand post-tension system
US8069624B1 (en) * 2007-10-17 2011-12-06 Sorkin Felix L Pocketformer assembly for a post-tension anchor system
US8065845B1 (en) 2008-07-18 2011-11-29 Sorkin Felix L Anchorage with tendon sheathing lock and seal

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