US3685934A - Anchorage system for stressing concrete - Google Patents

Anchorage system for stressing concrete Download PDF

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Publication number
US3685934A
US3685934A US864119A US3685934DA US3685934A US 3685934 A US3685934 A US 3685934A US 864119 A US864119 A US 864119A US 3685934D A US3685934D A US 3685934DA US 3685934 A US3685934 A US 3685934A
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United States
Prior art keywords
cable
anchor member
aperture
bulkhead
sleeve
Prior art date
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.)
Expired - Lifetime
Application number
US864119A
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English (en)
Inventor
Hugh Dana Huber
Jack C Edgren
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CONENCO INTERN Ltd
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CONENCO INTERN Ltd
Priority date (The priority date 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 date listed.)
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Publication date
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Publication of US3685934A publication Critical patent/US3685934A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
    • E04G15/04—Cores for anchor holes or the like around anchors embedded in the concrete
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49874—Prestressing rod, filament or strand

Definitions

  • the present invention relates to the prestressing of poured concrete members such as slabs or beams. More particularly, the present invention relates to an anchorage system for prestressing concrete wherein the tendons are stranded steel cable, typically having seven separate strands formed into a solid continuous tendon.
  • the tendons for prestressing systems are laid in place prior to pouring the concrete; and after the concrete has been poured and sufficiently cured to about 2,500 psi., a hydraulic jack pulls the tendon (usually out of a side of the slab) to induce a predetermined stress in the tendon which is anchored to the slab at its inboard end. After the desired stress has been induced in the tendon, the tendon is anchored to the concrete at its outboard edge so that the tendon remains permanently stressed. This takes place, of course, prior to loading the concrete structure with its intended load.
  • the present invention relates to the anchorage system for permitting the stressing of the tendon and for securing the tendon to an anchor member after it has been properly stressed.
  • One commercially-available anchorage system provides a paper overlay spirally wrapped about the cable; and a lubricant covers the steel strand beneath the paper overlay so that during stressing the cable may move relative to the concrete.
  • the cable may be obtained with a plastic tubular sleeve.
  • a plastic grout excluder in the form of a flexible, split bushing is first placed over the cable after the paper overlay (or tube) has been stripped back for a short distance.
  • a precast anchor plate having side nail holes anda central conical seating aperture is placed over the cable with the cable extending through the seating aperture and the wider portion of the seating aperture facing the bulkhead form which defines the side edge of the slab.
  • a plastic bayonet fitting is temporarily secured to the anchor plate by means of a bayonet lock.
  • the bayonet fitting is hollow for receiving the cable and has a longitudinal slot for fitting over the cable at an intermediate location.
  • the bayonet fitting extends through the bulkhead and defines a set of exterior screw threads outboard of the bulkhead.
  • the inboard side of this fitting connects to the anchor plate by means of a bayonet type lock.
  • a frusto-conical pocket former also of plastic, is interposed between the anchor plate and the inboard edge of the bulkhead. The function of the pocket former is to form a recess between the outboard edge of the slab and the conical seating surface of the anchor plate.
  • the anchor plate is then fixed in place by nailing it to the bulkhead through the nail holes provided in the anchor plate.
  • the stripped cable extends through the grout excluder, the precast anchor plate, the pocket former, the slotted bayonet fitting, and the bulkhead form.
  • a plastic nut is then secrewed onto the exterior threads of the bayonet fitting outboard of the bulkhead form, but because the bayonet fitting and nut are made of plastic sufiicient torque cannot be obtained to hold the heavy cast anchor plate in place without nailing.
  • the grout excluder does not adequately seal the inboard end of the conical seating surface of the anchor plate.
  • the grout excluder does not adequately seal the inboard end of the conical seating surface of the anchor plate.
  • the grout excluders come loose after the cables have been set up and the anchor plates initially secured to the bulkhead by nailing when workmen walk on the cables. That is, if a person steps on the cable adjacent the anchor plate, the grout excluder may be unseated; and if it is not replaced prior to pouring and vibrating, the entire conical seating aperture of the anchor plate will be filled with grout.
  • the system provides no means for positioning the strand in the center of the conical seating aperture for anchoring.
  • the strand moves to the side of the aperture and is held there by the poured concrete, uneven seating of the parts of the multi-part stressing wedger results. This condition can cause irratic losses in stressing forces and failure of the strand or the wedges.
  • the bayonet fitting is provided with a longitudinal slot so that it may be wedged open and secured'onto the cable at any intermediate length, but this slot also causes difficulty in that if grout enters it, the fitting will be secured to the cable, and it permits movement of the cable all the axis of the conical seating aperture particularly when the grout excluder becomes unseated from the anchor plate.
  • the present invention provides a steel strand cable in a plastic, tubular jacket with an annular space between the cable and jacket.
  • the plastic jacket Prior to assembling the anchor member, the plastic jacket is cut short of the end of the cable and stripped from the cable.
  • the anchor member includes a central conical seating aperture and an inter nally-threaded portion for receiving the stripped portion of the cable.
  • a frusto-conical solid rubber grommet with an axial aperture is placed over the cable board surface of the bulkhead to provide a recess if it is desired.
  • a metallic sleeve of closed section and having an intermediate threaded portion is placed over the cable and through the grommet and the anchor member for threaded connection with the intemallythreaded portion of the anchor member.
  • the outboard end of the sleeve is provided with a shoulder for engaging the outboard surface of the bulkhead; and the inboard end of the sleeve is provided with a reduced cylindrical portion which is telescopically received in the annular opening between the cable and the jacket the exterior surface of which snugly engages the interior surface of the jacket for sealing the same against grout.
  • the sleeve positively positions the strand in the center of the conical aperture for anchoring. That is highly advantageous for the anchor system to develop its design strength, and to achieve uniform distribution of stress through the anchor member.
  • drawing reference numeral 10 generally designates conventional stranded steel cable comprised of seven separate steel strands twisted to form a single tendon.
  • An anchor member is generally "designated 11, a rubber grommet 12, and a metallic sleeve member 13.
  • the cable 10 is provided with a tubular plastic jacket or sheath 14 having an interior 7 diameter slightly larger than the outer diameter of the cable 10 to provide an annular aperture generally designated 15 (FIG. 4). That is, the cable 10 is loosely located within the plastic jacket 14.
  • the jacket 14 Prior to assembly, the jacket 14 is cut as at 16 and the outboard (left as viewed in the drawing) portion of the sleeve 14 is stripped from the strand to leave the exposed portion 10a.
  • the anchor member 11 (also see FIG. 3) is a steel casting designed to accept and distribute the final force induced in the strand 10a; and it includes a transverse "plate 17, a first inboard cylindrical boss 18 which is provided with a central aperture 19 which is internally threaded as at 20. A plurality of radially-extending rib members 21 brace the boss 18 against to the plate 17.
  • a second boss or hub 22 Extending'from the opposite side of the transverse plate 17 (i.e., the outboard side thereof) is a second boss or hub 22 which defines a tapered or conical seating surface 23 opening in an outboard direction.
  • boss 22 is supported relative to the plate 17 by a pluthe 'cable.:'
  • the outboard edge of the conical seating set, the metallic sleeve is loosened and the wooden bulkhead is removed, and the compressed grommet will pop from its location thus facilitating access to .the recessed conical seating surface of the anchor member and obviating the difficulty in the above-mentioned prior system of having to remove the plastic pocket I former.
  • the threaded sealing engagement between the sleeve and the anchor member insures direct positive sealing against grout and easy removal by simply backing the threaded sleeve out of engagement with the anchor member and the plastic jacket of the cable.
  • FIG. 3 Sis an exploded view in'perspective of the inventive system.
  • the grommet 12 is located betweenthe anchor;
  • the bulkhead 26 includes a drilled hole 26a for receiving the strand; and it forms the edge of the slab, although the invention, of course, is not limited to slabs.
  • the grommet 12 has a generally frustoconical shape; and it defines a central cylindrical aperture 27 extending entirely through its axis.
  • the grommet 12 includes an inboard fiat surface 28, an outwardly-tapered side surface of frusto-conical shape 29 and a forward or outboard flat surface 30.
  • the grommet 12 is a solid member formed of flexible, resilient material such as rubber or neoprene.
  • the function of the grommet 12 is to provide a recess at the outboard edge of the concrete slab being formed, free of cement, to permit access to the conical seating surface 23 of the anchor member 11, and at the same time, to temporarily seal that seating surface from grout while the concrete is being poured or vibrated.
  • the aperture 26a of bulkhead 26 receives the sleeve 13.
  • the sleeve 13 is preferably formed from a hollow steel tube of closed section to provide a central closed conduit 32 for receiving the stripped portion 10a of the strand with little or no wobble. That is, the inside diameter of the sleeve 13 is preferably only slightly greater than the dimensions of the cable 10a to allow an easy fit while holding the strand in position placement during setting of the cement.
  • the outboard end of sleeve 13 is provided with a lock nut 33 which provides a shoulder 34 for engaging the outboard surface of the bulkhead 26.
  • a smooth cylindrical portion 35 of reduced diameter for fitting into the annular space 15 (see FIG. 2) between the strand 10a and the plastic jacket 14.
  • the sleeve 13 is provided with a set of exterior threads, generally designated 36, for threaded engagement with the interior threads 20 of the aperture 19in boss 18 of anchor member 1 1 (also see FIG. 2).
  • the tendons or cables may be supplied in predetermined lengths; and they are provided with conventional dead-end anchorages placed at locations within the forms prior to pouring the concrete.
  • the plastic jacket 14 is cut short of the bulkhead sufficient to allow room for the grommet and anchor member. The cut portion is stripped away.
  • the anchor member 11 is placed over the exposed cable a with the inboard transverse surface of the boss 18 engaging the cut edge 16 of the plastic jacket 14.
  • the grommet 12 is then fitted over the exposed cable 10a; and the outboard edge of the cable 10a is placed through the aperture 26a of the bulkhead form 26 (see FIGS. 2 and 3).
  • the sleeve 13 is placed over the exposed strand 10a with the reduced cylindrical portion 35 fitting into the annular space 15 between the jacket 14 and the strand 10a.
  • the exterior surface of the reduced cylindrical portion 35 snuggly but removeably engages the interior surface of the jacket 14 to form a seal and prevent the flow of grout between them.
  • the exterior intermediate threads 36 of the sleeve 13 are then screwed into the interior threads of the boss 18 until the outboard surface of the boss 22 forces the grommet 12 into engagement with the inboard surface of the bulkhead 26.
  • the lock nut 33 is further tightened with a wrench or other suitable means with the shoulder 34 bearing against the outboard surface of the bulkhead 26 to force the grommet 12 into a compressed state.
  • the sleeve 13 after it is sufficiently screwed into the anchor member 11, holds the anchor solidly in place by reaction with the bulkhead without the need of nailing the anchor in place or otherwise affixing it, as was required in the above-described prior system.
  • This is considered to be an important aspect of the present invention not only because it saves the time and labor of nailing the anchor member in place, but also because the sleeve secures the cable positively in place relative to the conical seating aperture so that the concrete is set, the sleeve 13 is removed and the cable stressed, the gripper wedges may be securely placed in position. If the axis of the cable is not colinear with the axis of the conical seating aperture, the wedges (not shown) will not be properly seated and may even slip through the anchor member.
  • the exterior threads 36 of the sleeve 13 together with the interior thread 20 of the boss 18 form a grout-tight seal to prevent the entering of grout, and at the same time, the reduced cylindrical portion 35 of the sleeve 13 enters further into the annular space 15 of the cable 10 as the sleeve 13 is tightened to form an even better seal between these elements. It has been found that even if the cut edge 16 of the plastic jacket 14 is shorter than desired so that the cement does engage the exterior surface of the reduced cylindrical portion 35 of the sleeve 13, this contact is easily broken when the sleeve 13 is retracted after the concrete has been poured, vibrated and set.
  • the wrench is used to remove the sleeve 13, and when the bulkhead 26 is next removed, the grommet 12, being in a state of compression, forces itself outwardly to pop out of contact with the set concrete thereby providing a recess for facilitating access to the tapered seating surface 23.
  • suitable means such as a hydraulic jack pulls the exposed portion of the strand 10a against the outboard surface of the hardened concrete to induce a stress in it; and when sufficient, predetermined stress has been induced in the cable, wedge-shaped gripper members (not shown) are positively seated within the seating surface 23 of the boss 22 of the anchor 11 to grip the exposed portion 10a of the cable and securely hold the same in place.
  • the hydraulic jack may then be removed.
  • the sleeve 13 as well as the grommet 12 may be reused in subsequent applications, and the conical aperture of the anchor member 11 is free from grout because the compressed, resilient grommet 12 effects a very good seal.
  • the grommet 12 also seals the aperture 26a of the bulkhead 26 from grout; and the reduced cylindrical portion 35 seals with the interior surface of the plastic jacket 14 to protect the cable from grout.
  • the grommet 12 may be omitted and the flat, outboard surface 22a of the anchor member will abut the inboard surface of the bulkhead 26.
  • the sleeve is suitable shorter than shown and the anchor member is still held in place solely by tightening of the sleeve 13. The resultant firm securement of the anchor member, and the closed section of the sleeve will properly align the cable in the conical seating aperture while sealing that aperture against grout.
  • An anchorage system for stressing steel cable in concrete partially defined by a form comprising stranded steel cable, a tubular jacket loosely fitted about said cable to seal against direct contact between said cable and said concrete, an anchor member defining a conical seating surface opening toward said form and receiving said cable, a tubular sleeve adapted to fit through an aperture in said form and over said cable and including means sealingly engaging said-anchor member inboard of said conical seating aperture to seal the same against grout and further including an inboard cylindrical section sealingly engaging the interior of said tubular jacket to protect said cable against grout said sleeve including an outer end carrying means for abutting a form.
  • said anchor member defines internal screw threads between said conical seating aperture and the inboard surface of said anchor member and wherein said tubular sleeve member defines shoulder means for engaging the outboard surface of said form and exterior screw threads for mating with the interior threads of said anchor member, said exterior threads of said tubular member being located intermediate said cylindrical section and said shoulder member.
  • tubular sleeve may be removed from its threaded connection with said anchor member and said form removed, and said compressed grommet will become unseated from its engagement with said anchor member.
  • a system for stressing concrete comprising a steel tendon having one end extending through an aperture in a bulkhead form, a plastic jacket surrounding said tendon and terminating short of said one end thereof, an anchor member defining a seating surface for receiving a permanent grip in securing said cable to said anchor member after tensioning and receiving said tendon, said aperture defining internal threads along a placement between said anchor member and said bulkhead form, and a sleeve defining an interior conduit for receiving said tendon, said sleeve passing through said apertures of said bulkhead, said grommet and threadably engaging said aperture of said anchor outboard end of said sleeve defining a shoulder for bearing against said bulkhead form whereby when said sleeve is rotated, said anchor member will be drawn to I compress said grommet against said bulkhead thereby firmly securing said anchor member in pouring said concrete and sealing said seating surface bearing plate extending transverselyv to said cable and a I hub projecting toward the other end of said cable, said tension applying anchorage including rein
  • said outer portion including abutment means thereon for engagement with a form board.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
  • Reinforcement Elements For Buildings (AREA)
US864119A 1969-10-06 1969-10-06 Anchorage system for stressing concrete Expired - Lifetime US3685934A (en)

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US86411969A 1969-10-06 1969-10-06

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US3685934A true US3685934A (en) 1972-08-22

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US (1) US3685934A (zh)
AU (1) AU2070770A (zh)
ES (1) ES196008Y (zh)
FR (1) FR2064169B1 (zh)
GB (1) GB1294945A (zh)
ZA (1) ZA706747B (zh)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4410162A (en) * 1980-08-16 1983-10-18 Dyckerhoff & Widmann Aktiengesellschaft Recoverable form part for use in the region where a tendon is anchored in a prestressed concrete component
US5509759A (en) * 1995-04-17 1996-04-23 Keesling; Klinton H. Prestressed concrete piling
US5747074A (en) * 1995-02-02 1998-05-05 Ollendick; David P. Apparatus for the manufacturing of prestressed reinforced concrete railroad ties and the like
US20040148880A1 (en) * 2003-02-03 2004-08-05 Norris Hayes Pocket former for post-tension anchor
US20050028477A1 (en) * 2003-07-28 2005-02-10 Freyssinet International (Stup) Method for strengthening a structure and associated anchorage unit
US20070289239A1 (en) * 2006-06-20 2007-12-20 Davis Energy Group, Inc. Slab edge insulating form system and methods
US20080134598A1 (en) * 2006-12-07 2008-06-12 Anthony Rizzuto Unbonded Post-Tension Strand Protector
US20150252577A1 (en) * 2012-09-28 2015-09-10 Hunnebeck Gmbh Wall formwork with sealing system
US9604416B2 (en) 2014-05-19 2017-03-28 Felix Sorkin Method of forming a post-tensioned concrete member utilizing a pocket former with keyway former
WO2017100894A1 (pt) * 2015-12-15 2017-06-22 Jacson Polese Dos Santos Conjunto de componentes para processos de encapsulamento de cordoalha em placa de ancoragem ativa em concreto protendido
US9827721B2 (en) 2015-08-04 2017-11-28 Felix Sorkin Collapsible element pocket former
US9869091B2 (en) 2015-08-04 2018-01-16 Felix Sorkin Pocket cap for post-tensioned concrete member
US9896845B2 (en) 2015-08-04 2018-02-20 Felix Sorkin Spindle lock anchor for post tensioned concrete member
US9932738B2 (en) 2015-08-04 2018-04-03 Felix Sorkin Sheathing retention capsule
US10145114B2 (en) 2015-08-04 2018-12-04 Felix Sorkin Sheathing lock end cap
WO2020061654A1 (pt) * 2018-09-24 2020-04-02 Evehx Engenharia Ltda Sistema de ancoragem encapsulada para cordoalha, dotada de sistema de corte para o revestimento da cordoalha
US10718124B1 (en) * 2019-06-18 2020-07-21 Rolando Blanco Concrete form tie rod puller
US20210054583A1 (en) * 2018-02-05 2021-02-25 Hengqin Gonge Technology Co., Ltd. A precast segmental pier reinforced with both frp bars and conventional steel bars
US20220112718A1 (en) * 2020-10-13 2022-04-14 Tokyo Rope Manufacturing Co., Ltd. Tendon anchorage and construction method of a pre-stressed concrete structure
US11427975B2 (en) * 2018-02-05 2022-08-30 Hengqin Gonge Technology Co., Ltd. Precast segmental pier reinforced with both conventional steel bars and high-strength steel bars

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2614915A1 (fr) * 1987-05-07 1988-11-10 Freyssinet Int Stup Perfectionnements aux dispositifs pour raccorder entre eux deux cables de precontrainte
CN112663937A (zh) * 2019-10-16 2021-04-16 新疆苏中建设工程有限公司 一种用于悬挑脚手架的周转式锚环

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2069005A (en) * 1936-09-03 1937-01-26 William B Damsel Tamperproof nonrefillable closure
US2341970A (en) * 1943-09-18 1944-02-15 Thexton Mfg Company Cable clamp
US3399434A (en) * 1965-09-27 1968-09-03 William F. Kelly Anchors for stressed cables
US3422586A (en) * 1966-05-12 1969-01-21 Domenico Parma System for post-stressing concrete slabs,beams or other structures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2069005A (en) * 1936-09-03 1937-01-26 William B Damsel Tamperproof nonrefillable closure
US2341970A (en) * 1943-09-18 1944-02-15 Thexton Mfg Company Cable clamp
US3399434A (en) * 1965-09-27 1968-09-03 William F. Kelly Anchors for stressed cables
US3422586A (en) * 1966-05-12 1969-01-21 Domenico Parma System for post-stressing concrete slabs,beams or other structures

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4410162A (en) * 1980-08-16 1983-10-18 Dyckerhoff & Widmann Aktiengesellschaft Recoverable form part for use in the region where a tendon is anchored in a prestressed concrete component
US5747074A (en) * 1995-02-02 1998-05-05 Ollendick; David P. Apparatus for the manufacturing of prestressed reinforced concrete railroad ties and the like
US6374475B1 (en) 1995-02-02 2002-04-23 David P. Ollendick Method for manufacturing prestressed reinforced concrete railroad ties
US6561780B2 (en) 1995-02-02 2003-05-13 David P. Ollendick System and assembly for the manufacturing of prestressed reinforced concrete railroad ties and the like
US20030113395A1 (en) * 1995-02-02 2003-06-19 Ollendick David P. Methods and apparatus for the manufacturing of prestressed reinforced concrete railroad ties and the like
US20050017403A1 (en) * 1995-02-02 2005-01-27 Ollendick David P. Methods and apparatus for the manufacturing of prestressed reinforced concrete railroad ties and the like
US5509759A (en) * 1995-04-17 1996-04-23 Keesling; Klinton H. Prestressed concrete piling
US7174685B2 (en) * 2003-02-03 2007-02-13 Hayes Specialty Machining, Ltd. Pocket former for post-tension anchor
US20040148880A1 (en) * 2003-02-03 2004-08-05 Norris Hayes Pocket former for post-tension anchor
US20050028477A1 (en) * 2003-07-28 2005-02-10 Freyssinet International (Stup) Method for strengthening a structure and associated anchorage unit
US8104246B2 (en) * 2003-07-28 2012-01-31 Freyssinet International (Stup) Method for strengthening a structure and associated anchorage unit
US8333047B2 (en) 2003-07-28 2012-12-18 Freyssinet International (Stup) Method for strengthening a structure and associated anchorage unit
US20070289239A1 (en) * 2006-06-20 2007-12-20 Davis Energy Group, Inc. Slab edge insulating form system and methods
US7596915B2 (en) * 2006-06-20 2009-10-06 Davis Energy Group, Inc. Slab edge insulating form system and methods
US20080134598A1 (en) * 2006-12-07 2008-06-12 Anthony Rizzuto Unbonded Post-Tension Strand Protector
US20150252577A1 (en) * 2012-09-28 2015-09-10 Hunnebeck Gmbh Wall formwork with sealing system
US9604416B2 (en) 2014-05-19 2017-03-28 Felix Sorkin Method of forming a post-tensioned concrete member utilizing a pocket former with keyway former
US20170152660A1 (en) * 2014-05-19 2017-06-01 Felix Sorkin Modified Pocket Former
US10072429B2 (en) * 2014-05-19 2018-09-11 Felix Sorkin Modified pocket former
US10343354B2 (en) * 2015-08-04 2019-07-09 Felix Sorkin Collapsible element pocket former
US10500799B2 (en) * 2015-08-04 2019-12-10 Felix Sorkin Collapsible element pocket former
US9896845B2 (en) 2015-08-04 2018-02-20 Felix Sorkin Spindle lock anchor for post tensioned concrete member
US9932738B2 (en) 2015-08-04 2018-04-03 Felix Sorkin Sheathing retention capsule
US10071530B2 (en) * 2015-08-04 2018-09-11 Felix Sorkin Collapsible element pocket former
US9827721B2 (en) 2015-08-04 2017-11-28 Felix Sorkin Collapsible element pocket former
US10145114B2 (en) 2015-08-04 2018-12-04 Felix Sorkin Sheathing lock end cap
US20190024187A1 (en) * 2015-08-04 2019-01-24 Felix Sorkin Collapsible element pocket former
US9869091B2 (en) 2015-08-04 2018-01-16 Felix Sorkin Pocket cap for post-tensioned concrete member
WO2017100894A1 (pt) * 2015-12-15 2017-06-22 Jacson Polese Dos Santos Conjunto de componentes para processos de encapsulamento de cordoalha em placa de ancoragem ativa em concreto protendido
US10626613B2 (en) 2015-12-15 2020-04-21 EVEXH Engenharia Ltda. Set of components for tendon encapsulation process in active anchor plate in prestressed concrete
US20210054583A1 (en) * 2018-02-05 2021-02-25 Hengqin Gonge Technology Co., Ltd. A precast segmental pier reinforced with both frp bars and conventional steel bars
US11427975B2 (en) * 2018-02-05 2022-08-30 Hengqin Gonge Technology Co., Ltd. Precast segmental pier reinforced with both conventional steel bars and high-strength steel bars
US11926976B2 (en) * 2018-02-05 2024-03-12 Hengqin Gonge Technology Co., Ltd. Precast segmental pier reinforced with both FRP bars and conventional steel bars
WO2020061654A1 (pt) * 2018-09-24 2020-04-02 Evehx Engenharia Ltda Sistema de ancoragem encapsulada para cordoalha, dotada de sistema de corte para o revestimento da cordoalha
US10718124B1 (en) * 2019-06-18 2020-07-21 Rolando Blanco Concrete form tie rod puller
US20220112718A1 (en) * 2020-10-13 2022-04-14 Tokyo Rope Manufacturing Co., Ltd. Tendon anchorage and construction method of a pre-stressed concrete structure

Also Published As

Publication number Publication date
FR2064169A1 (zh) 1971-07-16
ES196008Y (es) 1975-07-01
FR2064169B1 (zh) 1973-01-12
AU2070770A (en) 1972-04-13
ES196008U (es) 1975-03-01
ZA706747B (en) 1971-05-27
GB1294945A (zh) 1972-11-01

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