US3646748A - Tendons for prestressed concrete and process for making such tendons - Google Patents

Tendons for prestressed concrete and process for making such tendons Download PDF

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Publication number
US3646748A
US3646748A US22249A US3646748DA US3646748A US 3646748 A US3646748 A US 3646748A US 22249 A US22249 A US 22249A US 3646748D A US3646748D A US 3646748DA US 3646748 A US3646748 A US 3646748A
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United States
Prior art keywords
strand
tendon
corrosion inhibitor
wire
wire strand
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Expired - Lifetime
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US22249A
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English (en)
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Frederic A Lang
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AMICUS Inc
FIELDS GREGORY F
FREDERIC A LANG
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FREDERIC A LANG
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Assigned to FIELDS, GREGORY F. reassignment FIELDS, GREGORY F. SUBJECT TO CONDITIONS RECITED, ASSIGNOR HEREBY ASSIGNS FIFTY-ONE PERCENT UNDIVIDED INTEREST. Assignors: LANG FREDERIC
Assigned to AMICUS INC. reassignment AMICUS INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FIELDS, GREGORY F.
Assigned to FIELDS, GREGORY F. reassignment FIELDS, GREGORY F. ASSIGNMENT OF A PART OF ASSIGNORS INTEREST Assignors: LANG, FREDERIC A.
Assigned to AMICUS, INC., reassignment AMICUS, INC., ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FIELDS, GREGORY F.
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
    • D07B1/141—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising liquid, pasty or powder agents, e.g. lubricants or anti-corrosive oils or greases
    • D07B1/144—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising liquid, pasty or powder agents, e.g. lubricants or anti-corrosive oils or greases for cables or cable components built-up from metal wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/12—Machine details; Auxiliary devices for softening, lubricating or impregnating ropes, cables, or component strands thereof
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/14—Machine details; Auxiliary devices for coating or wrapping ropes, cables, or component strands thereof
    • D07B7/145—Coating or filling-up interstices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2023—Strands with core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2042—Strands characterised by a coating
    • D07B2201/2044—Strands characterised by a coating comprising polymers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2046—Strands comprising fillers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2075—Fillers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2075—Fillers
    • D07B2201/2077—Fillers having an anti-corrosive function
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2015—Construction industries
    • D07B2501/2023—Concrete enforcements

Definitions

  • a process of making said tendon which [56] References Cited comprises the steps of coating and filling the interstices of a multiple-wire strand with a corrosion inhibitor, passing same UNITED S A ENT through a circular die of a diameter greater than the strand to remove excess corrosion inhibitor and to form a circular en- 3,425,207 2/1969 Campbell ..57/149 X closure f id inhibitor around Said Strand, and melt exn-UCL i 3 4 1 777 ing a plastic jacket around said incased strand.
  • Tendons placed in a form which defines the shape of the concrete structure and which tendons can be elongated to a point within their elastic limit after the concrete hardens and thereafter fixed in the elongated state to produce compressive force or prestress in the concrete are known as posttensionable tendons.
  • the process is known as prestressing of concrete by posttensioning.
  • Important to the success of posttensioning is the desire that the tendon be free to move within the hardened concrete so that the tensile load is distributed evenly along the length of the tendon.
  • nuclear power plants usually include large containment vessels made of concrete to withstand internal pressure.
  • Some of these vessels have tendons that pass 180 or 270 around the vessel in the hoop direction and it is desirable that these tendons have as even a distribution of elongation as possible. Tendons are useful without concrete for many applications including buoys at sea and cable roof structures.
  • the multiple-wire strand has been preferred when the diameter of the steel component exceeds about 0.3 inch because it has better handling characteristics.
  • Difficulty has been experienced in obtaining uniform elongation during posttensioning with tendons that have curvature along their length of 180, or greater.
  • the best multiple-wire strand product known in the prior art when passed circumferentially around one-half of a circular vessel will have only 65 percent of the tensile load transmitted from the jacked end to the unjacked end when the load at the jacked end exceeds 50 percent or more of the strands breaking strength.
  • the present invention provides a stranded multiple-wire tendon which overcomes many of the disadvantages of the previous stranded multiple-wire tendons.
  • the present invention also provides in some of its embodiments a stranded tendon that gives more uniform elongation during posttensioning than previously known with commercially available stranded tendons when the curvature along the tendon is 180 or greater.
  • the present invention provides a tendon having increased reliability and increased assurance of trouble-free service prior to, during and following its installation.
  • the tendon of this invention comprises a stranded multiple-wire component incased in a corrosion inhibitor, having greaselike consistency, particularly relative to worked penetration and flow characteristics, in an amount sufficient to provide a circular incasement around the strand of at least two mils greater in diameter than that of the strand and having a seamless plastic jacket tightly covering said corrosion inhibitor incased strand.
  • This invention also includes the process of making said tendon which comprises incasing a multiple-wire strand with a corrosion inhibitor having greaselike properties, particularly relative to worked penetration and flow characteristics, smoothing and shaping said corrosion inhibitor so as to provide an incasement having a circular surface around the strand, the diameter of the circle being at least 2 mils greater than the diameter of the strand, and melt extruding and shrinking a seamless plastic tubularjacket around said incased strand to provide a tight jacket, thereby substantially excluding air and gas from between the jacket and the corrosion inhibitor.
  • FIG. 1 is a side view showing the components of a tendon
  • FIG. 2 is a cross section taken on line 2-2 of FIG. I;
  • FIG. 3 is a diagrammatic view of a process for making the tendon.
  • the tendon 14 contains a multiple-wire strand composed of a center wire 1 and six helically wrapped wires 2.
  • the strand is incased in a corrosion inhibitor 3 that fills all spaces within the strand and around it providing a circular enclosure of corrosion inhibitor of greater diameter than that of the strand.
  • the incased strand is jacketed with a tight seamless plastic jacket 4 to provide the novel tendon.
  • the diameter of the circular incasement of the corrosion inhibitor should be at least 2 mils greater than the diameter of the strand.
  • the plasticjacket should be sufficiently thick to re sist puncturing of the jacket during shipping and handling of the tendon as well as during the placing of the tendon and the pouring of the concrete.
  • FIG. 3 illustrates a process for making the novel tendon.
  • a multiple-wire strand 2 is passed into pressure chamber 5 into which a corrosion inhibitor is fed under pressure through inlet 6.
  • a tetrafluoroethylene polymer guide and grease retaining bushing 7 centers the strand and prevents the escape of corrosion inhibitor.
  • the pressure of the corrosion inhibitor is adjusted so that it penetrates and fills the voids in the strand.
  • a circular die 8 smooths and shapes the corrosion inhibitor so that it forms a circular incasement 3 about the strand 2.
  • the incased strand is then passed through the throat 9 of a tubing die 10. Molten thermoplastic polymer I1 is extruded as a tube around said incased strand.
  • the rate of travel of the strand and the rate of extruding of the thermoplastic polymer is adjusted so that there is a necking down 12 of the polymer at a distance from the die 10 that will permit the cooling of the polymer to a temperature below the vaporization temperature of the corrosion inhibitor.
  • the plastic polymer shrinks and forms a tight seamless plastic jacket 4 around said incased strand substantially excluding air and gas from between the jacket and the corrosion inhibitor.
  • the jacket be rapidly cooled and hardened so that the tendon 14 can be wound onto a spool for storage, or shipping. Any method of cooling and any cooling medium may be used as long as it is compatible with the jacket.
  • the plastic-jacketed tendon is passed into a water cooling tank 13, cold tap water enters the tank through pipe 15 and overflows into tank 16.
  • Slotted polyurethane sponge guides 17 and 18 maintain the water level so that it covers the tendon 14, thereby effectively cooling and hardening the plastic jacket.
  • the multiple-wire strand may be of any form. However, strands currently in use are those having one straight center wire and six wires helically wrapped in one direction to cover the center wire.
  • the diameter of the strand used herein and in the claims is the diameter of the circle that touches the outside surface of the wrapped wires.
  • strands of about 0.30 inches to about 0.75 inches in diameter are used, the upper limit being dictated by the ease of handling the tendon. Most strands in use vary in diameter from 0.375 to 0.625 inches. It is preferable that the wire strands be of high-tensile steel, having a breaking strength of at least 200,000 p.s.i.
  • the strand may be used in the form received from the manufacturer or its outer surface can be cleaned or polished by using abrasive-impregnated polishing wheels.
  • the strand may also be coated with a thin layer of a solid lubricant, especially polytetrafluoroethylene or a copolymer of tetrafluoroethylene and hexafluoropropylene containing 5 to 35 percent hexafluoropropylene.
  • a coating can be applied to the outer surface of a cleaned strand or a polished strand by coating the surface with an aquasol or organosol of the polymer and thereafter drying said coating and heating same to the fusion temperature of the polymer, usually in the range of 600 to 700 F.
  • the incasement of corrosion inhibitor is molded directly into the interstices and over the strand to a diameter greater than the strand. This may be accomplished by passing the strand through a chamber into which the corrosion inhibitor is fed under pressure and through a circular die of a diameter at least two mils greater than the diameter of the strand. The incased strand is then passed through the annular throat of a melt extrusion tubing die having an inside diameter which provides at least a 0.050 inch diametral clearance outside the incased strand. By controlling the rate of travel of the strand and the rate of extrusion of the plastic, the plastic tubing is necked down over a distance sufficient to cool the tubing to a temperature below the vaporization temperature of the corrosion inhibitor at the point of contact with the corrosion inhibitor. By this process air and other gases are substantially excluded from the tendon and a uniform seamless tight plastic jacket is created that maintains the strand in the incasement of the corrosion inhibitor.
  • the plastic used in making the jacket can be any thermoplastic polymer having the following properties: low permeability to air and moisture, high-tensile strength, and high stability in its chemical and physical properties.
  • the polymer employed for the jacket must exhibit a saturation moisture content at ambient conditions, usually room temperature of about 25 C., of less than 8 weight percent.
  • Useful polymers include the polyolefins prepared from one or more olefins having 2-10 carbon atoms, the polyamides formed from hexamethylenediamine and sebacic acid, normally referred to as a 6 nylon, the fluorocarbon polymers, and the vinyl polymers.
  • the polyolefins, especially high molecular weight polyethylene polymers, and the polymers and copolymers of propylene, are particularly useful.
  • the thickness of the molten polymer as extruded should be such that the resulting tubing wall is at least 6 mils thick, preferably 10 to mils thick, when using polypropylene.
  • the corrosion inhibitor should have greaselike properties, particularly the properties relative to the ability of the corrosion inhibitor to stay put and adhere to the strand. This includes all noncorrosive greases, greases that have corrosion inhibitor additives and corrosion inhibitors having greaselike consistency. This latter includes liquid corrosion inhibitors that have been thickened to give the consistency of a grease.
  • the corrosion inhibitor should have substantially the same ASTM worked penetration values as that of grease, namely values within the range of 85 to 385 at 77 F. as determined by the ASTM D217 method.
  • the corrosion inhibitor should be of a consistency that will maintain a uniform outside circular shape when passing through the incasement die and until the plastic jacket is applied.
  • EXAMPLE I A multiple-wire strand, 0.375 inches in diameter made from seven high-tensile steel wires is processed in accordance with the process described above relative to FIG. 3.
  • the strand is in the form as received from the manufacturer and has a breaking strength of 270,000 p.s.i.
  • the strand is passed through a pressure chamber fed with the corrosion inhibitor, Unoba A-2.
  • the circular incasement die at the end of the chamber has a diameter l0 mils greater than that of the strand.
  • the corrosion inhibitor is fed into the chamber under sufficient pressure to fill the strand interstices and in an amount sufficient to coat said strand so that the die will remove excess corrosion inhibitor, leaving a uniform circular incasement of corrosion inhibitor around and covering said strand.
  • the corrosion in hibitor incased strand is fed through the center of the annular throat of a melt extrusion tubing die having a diametral clearance of 0.1 inches outside the incased strand.
  • Polypropylene is melt extruded as a tubing around said strand.
  • the rate of travel of the strand and the rate of extruding of the polypropylene is controlled so that there is a necking down of the polypropylene tubing over a distance of 2 to 3 inches from the throat of the tubing die to the point of contact with the corrosion inhibitor on the strand.
  • the temperature of the polypropylene tubing is below the vaporization temperature of the corrosion inhibitor.
  • the tubing is rapidly cooled and hardened by passing the tendon into a water bath. Thereafter the tendon is wound onto a spool.
  • the above tendon was tested as follows to determine its uniformity of elongation when placed under tension in an are.
  • a ZOO-foot length of said tendon was embedded circumferentially around half of a circular concrete vessel having a diameter of approximately 125 feet with the ends of the tendon protruding tangentially from the vessel through load bearing plates.
  • a jack was attached at one end and a load of 16,000 lb. was imposed on the tendon. This load is 190,000 p.s.i.
  • a load cell was used to determine the load at the unjacked end. It was found that 78 percent of the load at the jacked end was transmitted to the unjacked end.
  • Example l was repeated with the single exception that the strand as received from the manufacturer was first polished with abrasive-impregnated polishing wheels to give an exceptionally smooth outer surface to said strand before applying the corrosion inhibitor.
  • the tendon obtained was tested in the same manner as the tendon of Example I and the load cell indicated that percent of the load atthe jacked end was transmitted to the unjacked end.
  • Example I was repeated with the single exception that the strand prior to applying the corrosion inhibitor was processed as follows.
  • the outer surface of strand as received from the manufacturer was polished as in Example ll with abrasive-impregnated polishing wheels to give a smooth outer surface.
  • This smooth outer surface was then coated with a thin layer of an organosol of the copolymer of tetrafluoroethylene and hexafluoropropylene containing 5 to 35 percent hexafluoropropylene.
  • the coating was then dried and thereafter heated to the fusing temperature of the copolymer, e.g., between 600 and 700 F.
  • the strand with a thin outer coating of the copolymer is then made into a tendon by the process of Example I.
  • the tendon obtained was tested in the manner as was the tendon of Example I and the load cell indicatedthat 89 percent of the load at the jacked end was transmitted to the unjacked end.
  • a tendon suitable for posttensioning concrete and for use in other applications comprising a multiple-wire strand incased in a corrosion inhibitor, having greaselike consistency relative to worked penetration, in an amount sufficient to provide a circular incasement around the strand of a diameter at least 2 mils greater than the diameter of the strand, and having a seamless plasticjacket tightly covering said incased strand.
  • the tendon of claim 1 which allows tensile loading along its length during posttensioning such that a ZOO-foot long tendon passing circumferentially around one-half of a circular vessel has at least 75 percent of the tensile load transmitted from the jacked end to the unjacked end when the load at the jacked end exceeds 50 percent or more of the strand's breaking strength.
  • the multiple-wire strand is of high-tensile steel and has on its outer surface a thin coating of a polymer selected from the group consisting of tetrafluoroethylene and copolymers of tetrafluoroethylene with 5 to 35 percent hexafluoropropylene.
  • a process for making a tendon suitable for use in the posttensioning of concrete and for use in other applications which comprises incasing a multiple-wire strand with a corrosion inhibitor having greaselike consistency, particularly relative to worked penetration and flow characteristics, smoothing and shaping said corrosion inhibitor so as to provide an incasement having a circular surface around the strand, the diameter of the circle being at least 2 mils greater than the diameter of the strand, and melt extruding and shrinking a seamless plastic tubular jacket around said incased strand to provide a tight jacket.
  • the multiple-wire strand is of high-tensile steel and has on its outer surface a thin coating of a polymer selected from the group consisting of tetrafluorethylene and copolymers of tetrafluorethylene with 5 to 35 percent hexafluoropropylene.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Ropes Or Cables (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Reinforcement Elements For Buildings (AREA)
US22249A 1970-03-24 1970-03-24 Tendons for prestressed concrete and process for making such tendons Expired - Lifetime US3646748A (en)

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Cited By (64)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2203926A1 (enExample) * 1972-10-19 1974-05-17 Japan National Railway
US3859780A (en) * 1972-11-17 1975-01-14 Fosroc Ag Method of forming an anchor cable
US3889455A (en) * 1972-08-02 1975-06-17 Pirelli Method and apparatus for impregnating stranded wires during stranding thereof
US3899384A (en) * 1970-12-02 1975-08-12 William F Kelly Apparatus for manufacturing a tendon
US3923003A (en) * 1974-05-06 1975-12-02 Southwire Co Production of flooded multistrand cable
US3979896A (en) * 1975-02-24 1976-09-14 The United States Of America As Represented By The Secretary Of The Navy Impregnated and encapsulated wire rope and cable
US4144610A (en) * 1977-04-27 1979-03-20 Custom Cable Company Flexible bristle
FR2450921A1 (fr) * 1979-02-23 1980-10-03 Sumitomo Metal Ind Materiau a base d'acier non magnetique pourvu d'un revetement superficiel
WO1982001208A1 (en) * 1980-09-25 1982-04-15 M Schupack Electrically isolated reinforcing tendon assembly and method
DE3038898A1 (de) * 1980-10-15 1982-04-22 Dyckerhoff & Widmann AG, 8000 München Verfahren zum erzeugen eines korrosionsschutzes bei litzen aus hochfesten stahldraehten
US4406114A (en) * 1981-10-26 1983-09-27 Southwire Company Core wire coating strander
US4445321A (en) * 1982-11-29 1984-05-01 Hutchinson Raymond E Tendon construction for posttensioning prestressed concrete and the method of making such tendons
FR2544768A1 (fr) * 1983-04-19 1984-10-26 Freyssinet Int Stup Perfectionnements aux procedes et dispositifs pour graisser les extremites d'armatures de precontrainte
US4490969A (en) * 1983-03-25 1985-01-01 Amsted Industries Incorporated Plastic encapsulated wire rope
US4533421A (en) * 1984-04-25 1985-08-06 Pattridge Post Tension, Inc. Method for making a lap seam extruded tendon
US4557087A (en) * 1982-09-04 1985-12-10 Japanese National Railways Metallic sheath for a posttensioning method provided with rust proofing treatment
FR2579236A1 (fr) * 1985-03-19 1986-09-26 Elf France Cable de precontrainte prefabrique et son procede de fabrication
US4616458A (en) * 1985-07-01 1986-10-14 Vsl Corporation Protective apparatus for tendons in tendon tensioning anchor assemblies
US4623504A (en) * 1984-10-22 1986-11-18 Smith Larry F Method and apparatus for making post-tensioning tendons for concrete
EP0146126A3 (en) * 1983-12-16 1986-12-17 Sumitomo Electric Industries Limited Steel materials for use with prestressed concrete
US4635433A (en) * 1984-11-20 1987-01-13 Kawasaki Steel Corporation Unbonded PC steel strand
US4653956A (en) * 1984-12-12 1987-03-31 Lang Frederic A Highway pavement
US4773198A (en) * 1986-09-05 1988-09-27 Continental Concrete Structures, Inc. Post-tensioning anchorages for aggressive environments
US4776161A (en) * 1984-11-20 1988-10-11 Kawasaki Steel Corporation Unbonded PC steel strand
US4849282A (en) * 1985-04-08 1989-07-18 Sumitomo Electric Prestressing steel material
US4870814A (en) * 1988-04-29 1989-10-03 Orscheln Co. Process for manufacturing corrosion resistant cable
EP0219894B1 (en) * 1985-09-20 1989-12-06 Bekaert-Cockerill Tendons with deferred bonding and method for stressing concrete, as well as prestressed concrete elements
EP0350822A3 (de) * 1988-07-15 1990-04-18 Bilfinger + Berger Vorspanntechnik Gmbh Verfahren zur Erneuerung des Korrosionsschutzes von Zuggliedern von Brücken und gleichartig verspannten Bauwerken sowie Vorrichtung zur Durchführung des Verfahrens
FR2642776A1 (fr) * 1989-02-07 1990-08-10 Sif Entreprise Bachy Elements de plancher a precontrainte relachable et procede de realisation d'une fouille par la technique de la paroi moulee les mettant en oeuvr
EP0441029A1 (en) * 1990-02-08 1991-08-14 SHINKO KOSEN KOGYO KABUSHIKI KAISHA also known as SHINKO WIRE CO.LTD. Process for making tendons for prestressed concrete structures
US5149385A (en) * 1986-12-28 1992-09-22 Shinko Kosen Kogyo Kabushiki Kaisha Tendons for prestressed concrete structures and method of using such tendons
US5254190A (en) * 1986-12-28 1993-10-19 Shinko Kosen Kogyo Kabushiki Kaisha Tendons for prestressed concrete structures and method of using such tendons
US5263307A (en) * 1991-02-15 1993-11-23 Hokkai Koki Co., Ltd. Corrosion resistant PC steel stranded cable and process of and apparatus for producing the same
WO1995001316A1 (fr) * 1993-07-01 1995-01-12 Bouygues Composition de beton de fibres metalliques pour mouler un element en beton, elements obtenus et procede de cure thermique
EP0505351B1 (de) * 1991-03-19 1995-12-20 Vorspann-Technik Gesellschaft m.b.H. Spannbündel für vorgespannte Tragwerke aus Beton
DE4435744A1 (de) * 1994-10-06 1996-04-11 Dyckerhoff & Widmann Ag Verfahren zum Reinigen und Freilegen längenmäßig begrenzter Abschnitte von Litzen aus Stahldrähten
US5573852A (en) * 1989-04-12 1996-11-12 Vorspann-Technik Gesellschaft M.B.H. Tensioning bundles comprising a plurality of tensioning members such as stranded wires, rods or single wires
EP0771593A2 (de) 1995-10-30 1997-05-07 DYCKERHOFF & WIDMANN AG Verfahren und Vorrichtung zum Freilegen und Reinigen von Litzen aus Stahldrähten
US5714093A (en) * 1994-10-21 1998-02-03 Elisha Technologies Co. L.L.C. Corrosion resistant buffer system for metal products
US5871668A (en) * 1994-10-21 1999-02-16 Elisha Technologies Co. L.L.C. Corrosion resistant buffer system for metal products
US5983618A (en) * 1998-03-31 1999-11-16 Pirelli Cable Corporation Apparatus, systems and methods for applying filling compound and water absorbing particles in a stranded conductor
DE19833332C1 (de) * 1998-07-24 1999-12-16 Dyckerhoff & Widmann Ag Korrosionsgeschütztes Stahlzugglied
US6080334A (en) * 1994-10-21 2000-06-27 Elisha Technologies Co Llc Corrosion resistant buffer system for metal products
US6115979A (en) * 1998-04-02 2000-09-12 Horstketter; Eugene A. Grout sealing apparatus for concrete panels, decks, and support beams and methods for their manufacture
DE19918438A1 (de) * 1999-04-23 2000-11-09 Dyckerhoff & Widmann Ag Korrosionsgeschütztes Stahlzugglied
EP1207242A3 (en) * 2000-11-17 2002-12-04 VSL International AG Multi-layer, thermal protection and corrosion protection coating system for metallic tendons, especially for external post-tensioning systems
US6588193B2 (en) * 1997-11-04 2003-07-08 Norris Hayes Corrosion resistant tendon system
FR2846982A1 (fr) * 2002-11-07 2004-05-14 Freyssinet Int Stup Cable de structure protege contre la corrosion, gel anti-corrosion, et procede d'injection de produits anti-corrosion dans le cable
CN102108643A (zh) * 2010-12-31 2011-06-29 赵国真 一种水利工程用钢丝绳养护方法及养护结构
CN103452244A (zh) * 2013-09-18 2013-12-18 天津鑫坤泰预应力专业技术有限公司 一种成品钢绞线束
DE102017217471A1 (de) * 2017-09-29 2019-04-04 Dywidag-Systems International Gmbh Spannglied mit Schlauchumhüllung
WO2019109725A1 (zh) * 2017-12-04 2019-06-13 东莞市意艾迪数控科技有限公司 递油结构及油边机
CN109944106A (zh) * 2019-04-18 2019-06-28 宝应县科达电缆料有限公司 一种环保阻燃电线电缆用填充绳的制备方法
US11274412B2 (en) 2019-01-31 2022-03-15 Terracon Consultants, Inc. Reinforcement structures for tensionless concrete pier foundations and methods of constructing the same
US11365523B2 (en) 2018-11-13 2022-06-21 Terracon Consultants, Inc. Methods for constructing tensionless concrete pier foundations and foundations constructed thereby
US11434617B2 (en) 2014-10-07 2022-09-06 Terraconn Consultants, Inc. Retrofit reinforcing structure addition and method for wind turbine concrete gravity spread foundations and the like
US20220281151A1 (en) * 2021-03-05 2022-09-08 Felix Sorkin U-shaped extrusion line
US11642013B2 (en) * 2017-03-31 2023-05-09 Hoya Corporation Method of producing endoscope flexible tube and method of producing endoscope
US20230151611A1 (en) * 2020-03-24 2023-05-18 Nv Bekaert Sa Post-tensioned concrete slab with fibres
US11661718B2 (en) 2018-07-25 2023-05-30 Terracon Consultants, Inc. Concrete pier foundation with lateral shear reinforcing loops and methods of constructing the same
US20240026683A1 (en) * 2020-09-08 2024-01-25 Nv Bekaert Sa Post-tensioned concrete with fibers for slabs on supports
US11885092B2 (en) 2019-01-31 2024-01-30 Terracon Consultants, Inc. Reinforcement structures for tensionless concrete pier foundations and methods of constructing the same
US12054947B1 (en) * 2024-01-08 2024-08-06 King Faisal University Multi-layer wedge anchorage for FRP plates and FRP tendons
EP4491681A1 (de) 2023-07-03 2025-01-15 voestalpine Wire Austria GmbH Korrosionsschutzsystem zur beschichtung einer metalloberfläche eines spannstahls, verfahren zum beschichten der metalloberfläche des spannstahls sowie spannstahl mit der beschichteten metalloberfläche

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US3922437A (en) * 1972-10-19 1975-11-25 Japan National Railway Steel material for use in the prestressed concrete
FR2203926A1 (enExample) * 1972-10-19 1974-05-17 Japan National Railway
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US3923003A (en) * 1974-05-06 1975-12-02 Southwire Co Production of flooded multistrand cable
US3979896A (en) * 1975-02-24 1976-09-14 The United States Of America As Represented By The Secretary Of The Navy Impregnated and encapsulated wire rope and cable
US4144610A (en) * 1977-04-27 1979-03-20 Custom Cable Company Flexible bristle
FR2450921A1 (fr) * 1979-02-23 1980-10-03 Sumitomo Metal Ind Materiau a base d'acier non magnetique pourvu d'un revetement superficiel
US4348844A (en) * 1980-09-25 1982-09-14 Morris Schupack Electrically isolated reinforcing tendon assembly and method
WO1982001208A1 (en) * 1980-09-25 1982-04-15 M Schupack Electrically isolated reinforcing tendon assembly and method
AT374568B (de) * 1980-10-15 1984-05-10 Dyckerhoff & Widmann Ag Verfahren zum erzeugen eines korrosionsschutzes bei litzen aus hochfesten stahldraehten
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US4490969A (en) * 1983-03-25 1985-01-01 Amsted Industries Incorporated Plastic encapsulated wire rope
FR2544768A1 (fr) * 1983-04-19 1984-10-26 Freyssinet Int Stup Perfectionnements aux procedes et dispositifs pour graisser les extremites d'armatures de precontrainte
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EP0146126A3 (en) * 1983-12-16 1986-12-17 Sumitomo Electric Industries Limited Steel materials for use with prestressed concrete
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US4635433A (en) * 1984-11-20 1987-01-13 Kawasaki Steel Corporation Unbonded PC steel strand
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US4653956A (en) * 1984-12-12 1987-03-31 Lang Frederic A Highway pavement
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US4849282A (en) * 1985-04-08 1989-07-18 Sumitomo Electric Prestressing steel material
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EP0219894B1 (en) * 1985-09-20 1989-12-06 Bekaert-Cockerill Tendons with deferred bonding and method for stressing concrete, as well as prestressed concrete elements
US4773198A (en) * 1986-09-05 1988-09-27 Continental Concrete Structures, Inc. Post-tensioning anchorages for aggressive environments
US5149385A (en) * 1986-12-28 1992-09-22 Shinko Kosen Kogyo Kabushiki Kaisha Tendons for prestressed concrete structures and method of using such tendons
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US4870814A (en) * 1988-04-29 1989-10-03 Orscheln Co. Process for manufacturing corrosion resistant cable
EP0350822A3 (de) * 1988-07-15 1990-04-18 Bilfinger + Berger Vorspanntechnik Gmbh Verfahren zur Erneuerung des Korrosionsschutzes von Zuggliedern von Brücken und gleichartig verspannten Bauwerken sowie Vorrichtung zur Durchführung des Verfahrens
FR2642776A1 (fr) * 1989-02-07 1990-08-10 Sif Entreprise Bachy Elements de plancher a precontrainte relachable et procede de realisation d'une fouille par la technique de la paroi moulee les mettant en oeuvr
EP0382608A1 (fr) * 1989-02-07 1990-08-16 Sondages Injections Forages "S.I.F." Entreprise Bachy Procédé de réalisation d'une fouille par la technique de la paroi moulée mettant en oeuvre des éléments de plancher à précontrainte relâchable
US5573852A (en) * 1989-04-12 1996-11-12 Vorspann-Technik Gesellschaft M.B.H. Tensioning bundles comprising a plurality of tensioning members such as stranded wires, rods or single wires
EP0441029A1 (en) * 1990-02-08 1991-08-14 SHINKO KOSEN KOGYO KABUSHIKI KAISHA also known as SHINKO WIRE CO.LTD. Process for making tendons for prestressed concrete structures
US5263307A (en) * 1991-02-15 1993-11-23 Hokkai Koki Co., Ltd. Corrosion resistant PC steel stranded cable and process of and apparatus for producing the same
AT400736B (de) * 1991-03-19 1996-03-25 Vorspann Technik Gmbh Spannbündel für vorgespannte tragwerke aus beton
EP0505351B1 (de) * 1991-03-19 1995-12-20 Vorspann-Technik Gesellschaft m.b.H. Spannbündel für vorgespannte Tragwerke aus Beton
WO1995001316A1 (fr) * 1993-07-01 1995-01-12 Bouygues Composition de beton de fibres metalliques pour mouler un element en beton, elements obtenus et procede de cure thermique
FR2708263A1 (fr) * 1993-07-01 1995-02-03 Bouygues Sa Composition de béton de fibres métalliques pour mouler un élément en béton, éléments obtenus et procédé de cure thermique.
US5683519A (en) * 1994-10-06 1997-11-04 Dyckerhoff & Widmann Aktiengesellschaft Method of cleaning and exposing portions of limited length of strands of steel wire
FR2725462A1 (fr) * 1994-10-06 1996-04-12 Dyckerhoff & Widmann Ag Procede pour nettoyer et mettre a nu des troncons de longueur limitee de torons de fils d'acier
DE4435744A1 (de) * 1994-10-06 1996-04-11 Dyckerhoff & Widmann Ag Verfahren zum Reinigen und Freilegen längenmäßig begrenzter Abschnitte von Litzen aus Stahldrähten
US6080334A (en) * 1994-10-21 2000-06-27 Elisha Technologies Co Llc Corrosion resistant buffer system for metal products
US6399021B1 (en) 1994-10-21 2002-06-04 Elisha Technologies Co Llc Method of treating concrete structures
US5871668A (en) * 1994-10-21 1999-02-16 Elisha Technologies Co. L.L.C. Corrosion resistant buffer system for metal products
US5714093A (en) * 1994-10-21 1998-02-03 Elisha Technologies Co. L.L.C. Corrosion resistant buffer system for metal products
US6106741A (en) * 1994-10-21 2000-08-22 Elisha Technologies Co Llc Corrosion resistant wire rope product
EP0771593A2 (de) 1995-10-30 1997-05-07 DYCKERHOFF & WIDMANN AG Verfahren und Vorrichtung zum Freilegen und Reinigen von Litzen aus Stahldrähten
US6588193B2 (en) * 1997-11-04 2003-07-08 Norris Hayes Corrosion resistant tendon system
US5983618A (en) * 1998-03-31 1999-11-16 Pirelli Cable Corporation Apparatus, systems and methods for applying filling compound and water absorbing particles in a stranded conductor
US6115979A (en) * 1998-04-02 2000-09-12 Horstketter; Eugene A. Grout sealing apparatus for concrete panels, decks, and support beams and methods for their manufacture
DE19833332C1 (de) * 1998-07-24 1999-12-16 Dyckerhoff & Widmann Ag Korrosionsgeschütztes Stahlzugglied
US6322281B1 (en) 1998-07-24 2001-11-27 Dyckerhoff & Widmann Aktiengesellschaft Corrosion-protected tension member of steel
EP0974708A1 (de) 1998-07-24 2000-01-26 Dyckerhoff & Widmann Aktiengesellschaft Korrosionsgeschütztes Stahlzugglied
DE19918438A1 (de) * 1999-04-23 2000-11-09 Dyckerhoff & Widmann Ag Korrosionsgeschütztes Stahlzugglied
EP1207242A3 (en) * 2000-11-17 2002-12-04 VSL International AG Multi-layer, thermal protection and corrosion protection coating system for metallic tendons, especially for external post-tensioning systems
FR2846982A1 (fr) * 2002-11-07 2004-05-14 Freyssinet Int Stup Cable de structure protege contre la corrosion, gel anti-corrosion, et procede d'injection de produits anti-corrosion dans le cable
WO2004044343A1 (fr) * 2002-11-07 2004-05-27 Freyssinet International (Stup) Cable de structure protege contre la corrosion, gel anti-corrosion, et procede d'injection de produits anti-corrosion dans le cable
CN102108643A (zh) * 2010-12-31 2011-06-29 赵国真 一种水利工程用钢丝绳养护方法及养护结构
CN102108643B (zh) * 2010-12-31 2012-07-25 赵国真 一种水利工程用钢丝绳养护方法及养护结构
CN103452244A (zh) * 2013-09-18 2013-12-18 天津鑫坤泰预应力专业技术有限公司 一种成品钢绞线束
CN103452244B (zh) * 2013-09-18 2016-01-20 天津鑫坤泰预应力专业技术有限公司 一种成品钢绞线束
US11814808B2 (en) 2014-10-07 2023-11-14 Terracon Consultants, Inc. Retrofit reinforcing structure addition and method for wind turbine concrete gravity spread foundations and the like
US11434617B2 (en) 2014-10-07 2022-09-06 Terraconn Consultants, Inc. Retrofit reinforcing structure addition and method for wind turbine concrete gravity spread foundations and the like
US11642013B2 (en) * 2017-03-31 2023-05-09 Hoya Corporation Method of producing endoscope flexible tube and method of producing endoscope
DE102017217471A1 (de) * 2017-09-29 2019-04-04 Dywidag-Systems International Gmbh Spannglied mit Schlauchumhüllung
WO2019109725A1 (zh) * 2017-12-04 2019-06-13 东莞市意艾迪数控科技有限公司 递油结构及油边机
US11661718B2 (en) 2018-07-25 2023-05-30 Terracon Consultants, Inc. Concrete pier foundation with lateral shear reinforcing loops and methods of constructing the same
US11976431B2 (en) 2018-11-13 2024-05-07 Terracon Consultants, Inc. Methods for constructing tensionless concrete pier foundations and foundations constructed thereby
US11365523B2 (en) 2018-11-13 2022-06-21 Terracon Consultants, Inc. Methods for constructing tensionless concrete pier foundations and foundations constructed thereby
US11885092B2 (en) 2019-01-31 2024-01-30 Terracon Consultants, Inc. Reinforcement structures for tensionless concrete pier foundations and methods of constructing the same
US11274412B2 (en) 2019-01-31 2022-03-15 Terracon Consultants, Inc. Reinforcement structures for tensionless concrete pier foundations and methods of constructing the same
CN109944106A (zh) * 2019-04-18 2019-06-28 宝应县科达电缆料有限公司 一种环保阻燃电线电缆用填充绳的制备方法
US20230151611A1 (en) * 2020-03-24 2023-05-18 Nv Bekaert Sa Post-tensioned concrete slab with fibres
US20240026683A1 (en) * 2020-09-08 2024-01-25 Nv Bekaert Sa Post-tensioned concrete with fibers for slabs on supports
WO2022187739A1 (en) * 2021-03-05 2022-09-09 Felix Sorkin U-shaped extrusion line
US20220281151A1 (en) * 2021-03-05 2022-09-08 Felix Sorkin U-shaped extrusion line
EP4491681A1 (de) 2023-07-03 2025-01-15 voestalpine Wire Austria GmbH Korrosionsschutzsystem zur beschichtung einer metalloberfläche eines spannstahls, verfahren zum beschichten der metalloberfläche des spannstahls sowie spannstahl mit der beschichteten metalloberfläche
US12054947B1 (en) * 2024-01-08 2024-08-06 King Faisal University Multi-layer wedge anchorage for FRP plates and FRP tendons

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CA943785A (en) 1974-03-19
GB1341632A (en) 1973-12-25
JPS5347609B1 (enExample) 1978-12-22

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