EP0863277B1 - Verfahren zur Realisierung eines vor- oder nachgespannten Bauwerks und Verfahren zur Herstellung von Litzen zur Verwendung in einem solchen Verfahren - Google Patents

Verfahren zur Realisierung eines vor- oder nachgespannten Bauwerks und Verfahren zur Herstellung von Litzen zur Verwendung in einem solchen Verfahren Download PDF

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Publication number
EP0863277B1
EP0863277B1 EP98400427A EP98400427A EP0863277B1 EP 0863277 B1 EP0863277 B1 EP 0863277B1 EP 98400427 A EP98400427 A EP 98400427A EP 98400427 A EP98400427 A EP 98400427A EP 0863277 B1 EP0863277 B1 EP 0863277B1
Authority
EP
European Patent Office
Prior art keywords
stranded cable
wires
filling material
strand
sheath
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
EP98400427A
Other languages
English (en)
French (fr)
Other versions
EP0863277A1 (de
Inventor
Jean-Pierre Cagnat
Christian Tourneur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Freyssinet International STUP SA
Original Assignee
Freyssinet International STUP SA
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.)
Filing date
Publication date
Application filed by Freyssinet International STUP SA filed Critical Freyssinet International STUP SA
Publication of EP0863277A1 publication Critical patent/EP0863277A1/de
Application granted granted Critical
Publication of EP0863277B1 publication Critical patent/EP0863277B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
    • D07B1/165—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber inlay
    • 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
    • D07B7/14—Machine details; Auxiliary devices for coating or wrapping ropes, cables, or component strands thereof
    • D07B7/145—Coating or filling-up interstices
    • 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
    • D07B7/16—Auxiliary apparatus
    • D07B7/18—Auxiliary apparatus for spreading or untwisting ropes or cables into constituent parts for treatment or splicing purposes
    • D07B7/185—Auxiliary apparatus for spreading or untwisting ropes or cables into constituent parts for treatment or splicing purposes for temporarily untwisting ropes or cables into constituent parts for applying a coating
    • 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
    • E04C5/085—Tensile members made of fiber reinforced plastics
    • 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
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • 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
    • D07B2201/2024—Strands twisted
    • 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
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2065—Cores characterised by their structure comprising a coating
    • 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
    • D07B2201/2071—Spacers
    • D07B2201/2073—Spacers in circumferencial direction
    • 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
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3003—Glass
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3007—Carbon
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3025—Steel
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3071—Zinc (Zn)
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2207/00—Rope or cable making machines
    • D07B2207/40—Machine components
    • D07B2207/404—Heat treating devices; Corresponding methods
    • 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

  • the present invention relates to the field of strands used in construction works. She finds an important application in pre- or post-stress such works by means of strands stretched to inside injected sheaths.
  • the invention relates more specifically to strands of which at least some of the constituent wires have a portion of their surface exposed to the strand environment, as opposed to sheathed strands which, from their manufacture, are individually contained in a protective sheath, most often with a protective material such as wax, fat or elastomer.
  • a protective material such as wax, fat or elastomer.
  • unsheathed strands are often preferred due to their lower cost and the fact that their anchoring is less delicate. Indeed, it is not necessary, after placement of such a strand in its sheath, to strip the portions of this strand that will be trapped in the keys of the anchor and remove the material protective in these portions. This facilitates anchoring and makes it safer since we have the assurance that it does not subsist not, between the wires and the keys, a material which would harm the firmness of the anchor.
  • US-A-5,263,307 describes a prestressing strand in which a synthetic resin paint coats the wires, inward and outward of the strand.
  • the constituent wires of this strand are thus incorporated into a sort of matrix whose rigidity harms deformability of the strand.
  • the handling of such a strand and its implementation place in a sheath (most often not straight) are therefore problematic.
  • the coating resin must be completely removed from the periphery of the strand at level of the anchors, so that the internal teeth keys fit well on the steel of the wires and not on synthetic resin which offers only a weak shear strength.
  • Figure 1 shows a book comprising several portions 2, 2A, 2B, in which passed a prestressing sheath 1.
  • the strands 3 are tensioned and anchored at both ends of the sheath 1 by means of anchoring devices 4, for example at keys, shown schematically in Figure 1.
  • a grout 5 generally a cement grout, is injected inside the sheath 1 after tensioning and anchoring the strands 3.
  • This grout 5 is for example injected by the ends of the sheath by means of appropriate conduits provided in the anchoring devices 4 or in their vicinity.
  • the grout 5 is injected under pressure at one end, as symbolized by pump A, the other end being provided with a depressurized vent B or simply vented.
  • the filling of the sheath poses a difficulty of most of the time a certain amount of water gets separates from the grout at the end of the injection, this water coming accumulate to form pockets of water in points top of the sheath, for example at points 8, 8A shown in Figure 1.
  • the water is generally reabsorbed by the grout when it sets, or it is evacuated into the structure. But then she leaves remain voids, often accompanied by deposits of soluble components of the grout entrained by water. The strands are poorly protected in these areas and may corrode, which is a weakness of the book.
  • Figure 2 shows a cross section of a unsheathed strand as commonly used in the art earlier.
  • the strand usually consists of seven wires stranded together: a central wire, or core, 6 and six wires peripherals 7 twisted around the core 6. These wires 6, 7 are solid wires, most often metallic.
  • the core 6 has a diameter slightly greater than that peripheral wires 7 (for example 5.2 mm instead of 5 mm in strands with a diameter of 15.2 mm). It thus exists small intervals e between the wires peripheral devices. Towards the outside of these intervals e, the surface of peripheral wires 7 is exposed to the environment of the strand. Inward intervals e, the strand has six internal gaps i between the core 6 and the peripheral wires 7, interstices whose section is in the shape of a curvilinear triangle.
  • An object of the invention is to provide a solution simple and effective to the problem of observed pockets of water in the pre- or post-stress ducts, a solution which not significantly penalize the convenience of putting in use and anchoring the strands.
  • the invention thus provides a method of making of pre- or post-stressed construction works such as as set out in claim 1.
  • the filling material which, preferably, fills the entire volume of internal gaps, prevents infiltration of water between the strand wires and its path along the internal interstices.
  • the phenomenon undesirable filtration of the grout, which separates part of its liquid phase of its solid components, is further eliminated.
  • the invention relates to a process for manufacturing a strand, as defined in claim 4.
  • the strand 3 shown in Figure 3 differs from the one previously commented with reference to Figure 2 by the presence of a filling material in the internal gaps i defined between the constituent wires 6, 7 of the strand.
  • this strand 3 can be installed as previously described in reference to figure 1. Elimination of the phenomenon undesirable filtration of the grout between the wires strand 7 devices will remove, or at least prevent almost completely, the problems linked to the formation of water pockets in the sheath 1.
  • the filling material of the interstices i is chosen so as to be viscous enough not to flow or be driven out by the pressure of the grout. She must on the other hand be compatible with the nature of the wires 6, 7 so as not to cause corrosion.
  • Examples of usable materials are waxes, in particular petroleum, silicone or polybutadiene pastes, or still any similar material having the characteristics adequate physical and chemical properties, including not oppose the good jamming of the core 6 during anchoring of the strand.
  • the plastic characteristics of this material are selected so that the strand retains a good plasticity, allowing its winding as well as its threading in winding sheaths.
  • the material of the wires 6, 7 will generally be steel as usual, although various materials are conceivable, for example carbon fibers or of glass.
  • the number of threads is preferably, but not restrictively, from seven.
  • the filling material provides active protection of the wire metal.
  • a polarizing material leading to cathodic protection to fight even more effectively against corrosion.
  • a resin for example epoxy, charged with metallic particles, in particular zinc, or still a soft metal.
  • the manufacture of a strand such as that shown in Figure 2 or 3 essentially consists of winding helix the outer wires 7 around the core 6.
  • strand 3 is made from steel wires requiring thermomechanical stabilization treatment performed at medium high temperature (around 400 ° C), it could happen that the filling material is altered if it is put in place prior to treatment.
  • the deposition of the filling material 9 on the core of the strand is carried out during a loosening of the strand after the thermomechanical treatment. This operation of loosening spreads the peripheral wires 7, allowing so inject the filling material between these wires peripherals 7 by means of nozzles 10 suitably positioned ( Figure 4).
  • the contribution of filling material can correspond exactly to the quantity required or may contain a slight excess subsequently eliminated.
  • FIG. 5 shows schematically an installation can be used to make a strand in accordance with present invention.
  • a conventional stranding unit 20 is supplied with the core 6 and the six peripheral wires 7 from respective reels 16, 17, and manipulates these wires to form the strand 3. This is, if necessary, subjected to heat or thermomechanical treatment in a unit 30.
  • the strand thus obtained is of structure classic. It can be immediately issued to the loosening and tightening 40, as shown, or be stored as is for later introduction in this unit 40.
  • the reference 50 symbolizes the means used to deposit filling material during the strand is loose (bath, or nozzles 10 as shown in Figure 4).
  • a cleaning unit 60 mechanical and / or chemical eventually removes excess filling material, before the strand 3 is finally wound by a 70 unit.

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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)
  • Reinforcement Elements For Buildings (AREA)
  • Cable Accessories (AREA)
  • Ropes Or Cables (AREA)

Claims (5)

  1. Verfahren zur Realisierung eines vor- oder nachgespannten Bauwerks, bei dem mindestens eine Litze (3) in einem Vor- oder Nachspannungsrohr (1) vorgesehen wird, diese Litze gespannt, an den Enden des Rohrs mit Verankerungsvorrichtungen (4) befestigt und eine härtbare Masse (5) in das Rohr gespritzt wird, dadurch gekennzeichnet, dass zur Vermeidung einer Ansammlung von Wasser aus der Masse (5) im oben gelegenen Teil des Verlaufs des Rohrs (1) eine Litze (3) verwendet wird, die mehrere verlitzte Volldrähte (6, 7) umfasst, zwischen denen sie innere Zwischenräume (i) aufweist, wobei ein Abschnitt der Fläche der Drähte (7), die sich am Umfang der Litze befinden, der äußeren Umgebung der Litze direkt ausgesetzt ist, um eine gute Verankerung der Litze sicherzustellen, wobei in den inneren Zwischenräumen ein Füllmaterial vorhanden ist, das verhindert, dass die aus der Masse austretende Flüssigkeit in die inneren Zwischenräume der Litze gelangen und sich entlang der Litze in ihren inneren Zwischenräumen ausbreiten kann.
  2. Verfahren nach Anspruch 1, bei dem die Füllmasse die Plastizitätseigenschaften eines Wachses, einer Silikonpaste oder von Polybutadien oder eines Weichmetalls hat, die der Litze ihre Verformbarkeit erhalten.
  3. Verfahren nach Anspruch 1 oder 2, bei dem die Drähte (6, 7) aus Metall sind und das Füllmaterial so gewählt ist, dass es einen aktiven, kathodenartigen Schutz des Metalls der Drähte gewährleistet.
  4. Verfahren zur Herstellung einer Vor- oder Nachspannlitze (3) mit einem mittleren Draht (6) und Umfangsdrähten (7), deren Oberfläche in ihrem äußeren Bereich der Litze der äußeren Umgebung der Litze ausgesetzt ist, gekennzeichnet durch folgende Schritte:
    Verlitzung der Umfangsdrähte um den Mitteldraht zur Bildung der Litze;
    Aufdrehen der Litze;
    Aufbringen eines Füllmaterials (9) auf den Mitteldraht (6) der aufgedrehten Litze zwischen den Umfangsdrähten (7);
    erneutes Verdrehen der Litze in der Weise, dass das Füllmaterial die Zwischenräume (i) in Form krummliniger Dreiecke ausfüllt, die sich zwischen dem Mitteldraht und den Umfangsdrähten befinden;
    Reinigung der wieder verdrehten Litze zum Entfernen überschüssigen Füllmaterials, das aus der Litze herausgequollen ist.
  5. Verfahren nach Anspruch 4, bei dem die Schritte des Aufdrehens, Einbringens, Wiederverdrehens und Reinigens nach einer thermischen oder thermomechanischen Behandlung erfolgen.
EP98400427A 1997-02-20 1998-02-20 Verfahren zur Realisierung eines vor- oder nachgespannten Bauwerks und Verfahren zur Herstellung von Litzen zur Verwendung in einem solchen Verfahren Expired - Lifetime EP0863277B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9702013 1997-02-20
FR9702013A FR2759715B1 (fr) 1997-02-20 1997-02-20 Toron pour ouvrages de construction, procedes de fabrication et de mise en oeuvre de tels torons

Publications (2)

Publication Number Publication Date
EP0863277A1 EP0863277A1 (de) 1998-09-09
EP0863277B1 true EP0863277B1 (de) 2003-04-09

Family

ID=9503969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98400427A Expired - Lifetime EP0863277B1 (de) 1997-02-20 1998-02-20 Verfahren zur Realisierung eines vor- oder nachgespannten Bauwerks und Verfahren zur Herstellung von Litzen zur Verwendung in einem solchen Verfahren

Country Status (3)

Country Link
EP (1) EP0863277B1 (de)
ES (1) ES2196508T3 (de)
FR (1) FR2759715B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114959982B (zh) * 2022-05-24 2024-02-13 格兰茨斯托夫工业制品(青岛)有限公司 一种pet轮胎帘子线的制备方法及其生产系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE795398A (fr) * 1972-06-07 1973-05-29 Stup Procedes Freyssinet Procede d'injection des espaces vides compris entre un cable de precontrainte compose de torons et le conduit qui le contient
GB1599410A (en) * 1978-05-25 1981-09-30 Bridon Ltd Corrosion prevention in steel wire strand and rope
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
DE4435744C2 (de) * 1994-10-06 1997-10-02 Dyckerhoff & Widmann Ag Verfahren zum Reinigen und Freilegen längenmäßig begrenzter Abschnitte von Litzen aus Stahldrähten

Also Published As

Publication number Publication date
FR2759715B1 (fr) 1999-04-23
EP0863277A1 (de) 1998-09-09
FR2759715A1 (fr) 1998-08-21
ES2196508T3 (es) 2003-12-16

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