EP0572315A1 - Perfectionnements aux dispositifs pour effectuer des ancrages intermédiaires sur des câbles de précontrainte - Google Patents

Perfectionnements aux dispositifs pour effectuer des ancrages intermédiaires sur des câbles de précontrainte Download PDF

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Publication number
EP0572315A1
EP0572315A1 EP93401338A EP93401338A EP0572315A1 EP 0572315 A1 EP0572315 A1 EP 0572315A1 EP 93401338 A EP93401338 A EP 93401338A EP 93401338 A EP93401338 A EP 93401338A EP 0572315 A1 EP0572315 A1 EP 0572315A1
Authority
EP
European Patent Office
Prior art keywords
strands
cable
plates
shoes
grooves
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.)
Ceased
Application number
EP93401338A
Other languages
German (de)
English (en)
French (fr)
Inventor
Carlos De La Fuente
Pierre Jartoux
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 EP0572315A1 publication Critical patent/EP0572315A1/fr
Ceased legal-status Critical Current

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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
    • E04C5/12—Anchoring devices
    • 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

Definitions

  • the invention relates to concrete structures which are prestressed using cables anchored at their two ends to these structures, said cables being composed of strands or multiple wires.
  • It relates more particularly to devices which are intended to anchor on an intermediate element constituting such a structure part of the useful force of such a cable.
  • Such an intermediate anchor is for example useful during the construction of a concrete structure such as the beam 1 shown diagrammatically in FIG. 1, comprising a plurality of reinforcement crosspieces 2 separated by spaces or volumes of air 3 and prestressed by prestressing cables 4, each cable successively crossing these crosspieces and these spaces, and the crossings of the crosspieces by the cables being carried out in tubes making it possible for the cables to slide relatively relative to the concrete.
  • the two ends A and B of the cable 4 are anchored on two end spans and it may be necessary to make integral with an intermediate crosspiece, such as that designated by the reference 21, the portion, of the cable 4, next to this cross.
  • Some of the devices which have been proposed to date for ensuring such intermediate anchors essentially comprise two anchor plates each perforated by a plurality of frustoconical bores suitable for each receiving one of the strands of the cable to be anchored with interposition of two tapered jaws split at opposite convergences.
  • Such an anchoring is only applicable to a cable of rectangular overall section and it is difficult to ensure the necessary attachment both between the various strands juxtaposed transversely as between the peripheral strands and the shoes.
  • Document FR-A-1 464 818 has also proposed a device for anchoring a cable with multiple strands comprising a stack of grooved plates interposed respectively between the layers of consecutive strands, stack delimited by two end plates or clamped jaws one against the other using bolt-nut systems.
  • the object of the invention is, among other things, to eliminate the various drawbacks indicated above by making it possible in particular to carry out an intermediate anchoring on cables of circular or similar overall section, and in particular hexagonal.
  • the intermediate anchoring devices of the type in question according to the invention also comprise two shoes arranged on either side of the cable, shoes joined longitudinally, that is to say in the longitudinal direction of the cable, with the intermediate element and means for bringing the two shoes together mutually perpendicular to the longitudinal direction of the cable so as to secure them with the strands, and they are essentially characterized in that they also comprise a plurality of grooved plates arranged in parallel to each other between the different strands of strands constituting the cable so that each strand is joined contiguously in two facing grooves respectively comprised by two adjoining plates, the two shoes being applied respectively against the two end plates of the stack constituted by the various plates placed between the strands, in that the stacked set of grooved plates placed between the different strands of the cable has the general shape of a cylindrical wafer of revolution, in that the bottoms of the grooves are hollowed out by narrow longitudinal grooves so as to give the plates a certain elasticity favoring the effectiveness of their application against the strands, and
  • the invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.
  • FIG. 1, of these drawings shows, as already indicated above, a concrete beam reinforced by a prestressing cable, an intermediate zone of this cable being anchored on an intermediate crosspiece constituting said beam, and said anchoring being executed in accordance with the invention.
  • Figure 2 shows partially and in more detail the intermediate cross member and the anchoring device figure 1.
  • FIGS. 3 and 4 show on a larger scale the same device, respectively in end view according to arrow III in FIG. 4 and in cross section according to IV-IV, FIG. 3.
  • Figures 5 and 6 finally show on an even larger scale, respectively in end view and in partial section along VI-VI, Figure 5, the grooved plates included by the above intermediate anchoring device.
  • the feet of the tie rods 10 are secured to the element 21.
  • This fastening of the feet of the tie rods 10 with the element 21 can be achieved by direct embedding of the ends of these feet in this element.
  • connection pieces R on which these feet can be assembled in an easily removable manner.
  • the heads of the tie rods 10 are threaded, pass through the jaws 8 and 9 and are secured to the latter by screwing each of these heads with two nuts 13 and 14 enclosing said jaws between them (FIG. 4).
  • transverse ridges 15 are practiced in these bottoms (FIG. 6).
  • FIGS. 3 and 5 show only a few of the grooves 16, but such grooves are preferably hollowed out at the bottom of all the grooves 7.
  • the transverse approximation of the jaws 8 and 9 is preferably carried out using an appropriate jack (not shown) and the finally obtained tight state of all of the strand plies 5 and of the plates 6 is then easily preserved by screwing of appropriate bolts 17 passing through smooth bores 18 of the jaw 8 into threaded bores 19 of the jaw 9, the pressure of the jack being released only after such a screwing.
  • Said grooved plates 6 are advantageously constituted by steel molded in lost wax, the surface of said plates preferably being hardened by a thermochemical treatment.
  • FIG. 2 also shows furs or tubular sections 20 which serve to restore the continuity of the seal between, on the one hand, the ends cut from the sheath 21 enveloping the strands 5 and, on the other hand, the jaws 8 and 9, after execution of the intermediate anchoring on the element 21.
  • the cable 4 with multiple strands 5 is put in place in the structure 1, including its two ends A and B, the element 21 being traversed with the possibility of sliding of the sheath 21 which externally delimits the cable in a tube of guide, for example metallic.
  • a small length of the cable is then released by cutting its sheath 21 in correspondence.
  • the jaws 8 and 9 are put in place, on the one hand, by covering the pancake laterally with these jaws and, on the other hand, by introducing longitudinally into them here the tie rods 10.
  • the transverse position of the latter already corresponds to a contiguous transverse application, that is to say with contact, but without clamping, between the various rigid elements intended to be clamped transversely the against each other: it is therefore not necessary to provide a possibility of transverse displacement of the jaws relative to the tie rods, the slight flexibility of these tie rods being quite sufficient to absorb by itself the very small mutual transverse displacements of the jaws due to subsequent tightening.
  • the cable 4 is then tensioned between the extreme anchoring devices A and B.
  • the intermediate anchoring device C is tightened (FIG. 1), that is to say the mutual approximation of the jaws in the manner indicated above, by successively involving the pressure d 'a jack, then tightening the bolts 17 and finally the release of the jack.
  • the desired intermediate anchoring between the stripped portion of the cable 4 and the 21 element is then achieved.
  • the intermediate anchoring device described above makes it possible to modulate the intermediate anchoring force applied at any intermediate point C of the cable 4 between the extreme limits 0 and 100% of the tension applied to this cable between its ends A and B.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Bridges Or Land Bridges (AREA)
EP93401338A 1992-05-26 1993-05-25 Perfectionnements aux dispositifs pour effectuer des ancrages intermédiaires sur des câbles de précontrainte Ceased EP0572315A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9206436 1992-05-26
FR9206436A FR2691737A1 (fr) 1992-05-26 1992-05-26 Perfectionnements aux dispositifs pour effectuer des ancrages intermédiaires sur des câbles de précontrainte.

Publications (1)

Publication Number Publication Date
EP0572315A1 true EP0572315A1 (fr) 1993-12-01

Family

ID=9430199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93401338A Ceased EP0572315A1 (fr) 1992-05-26 1993-05-25 Perfectionnements aux dispositifs pour effectuer des ancrages intermédiaires sur des câbles de précontrainte

Country Status (4)

Country Link
EP (1) EP0572315A1 (enrdf_load_stackoverflow)
JP (1) JPH06317020A (enrdf_load_stackoverflow)
FR (1) FR2691737A1 (enrdf_load_stackoverflow)
TW (1) TW235322B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2818676A1 (fr) * 2000-12-27 2002-06-28 Freyssinet Int Stup Procede de demontage d'un cable de precontrainte et dispositif pour la mise en oeuvre
CN102373770A (zh) * 2011-11-21 2012-03-14 华汇工程设计集团股份有限公司 一种钢绞线端部锚固结构及其锚固方法
CN108221668A (zh) * 2018-02-02 2018-06-29 柳州桂桥缆索有限公司 一种可调式建筑工程用拉索及其张拉方法
ES2735145A1 (es) * 2018-06-12 2019-12-16 Fcc Construccion Sa Sistema y procedimiento de destesado de tirantes por incorporación de, o sustitución por, material de relleno mejorado
FR3157877A1 (fr) * 2023-12-27 2025-07-04 Soletanche Freyssinet Ancrage de substitution

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103644119B (zh) 2008-07-25 2016-12-07 Lg电子株式会社 电动机构和压缩机

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE512495A (enrdf_load_stackoverflow) *
GB666506A (en) * 1949-02-14 1952-02-13 Nat Res Dev Improvements relating to clamp devices
FR1062743A (fr) * 1952-09-05 1954-04-27 Preload Co Procédé et dispositif de précontrainte d'armatures coudées
FR1149476A (fr) * 1955-03-21 1957-12-26 Evg Entwicklung Verwert Ges éléments tendeurs ou d'ancrage et barres d'armature du béton
FR1464818A (fr) * 1965-11-24 1967-01-06 Cie Ind De Travaux Dispositif d'ancrage pour béton précontraint
DE2515423A1 (de) * 1974-04-26 1975-11-13 Felten & Guilleaume Ag Oester Verankerungsvorrichtung fuer verbundstraenge aus einem kunststoffkoerper und in diesen eingebetteten insbesondere parallelen draehten
FR2426127A1 (fr) * 1978-05-16 1979-12-14 Boonman Cornelis Construction d'ancrage pour elements de precontrainte
GB2077343A (en) * 1980-05-24 1981-12-16 Strabag Bau Ag Anchorage devices for a bundle of tension wires
EP0190989A1 (de) * 1985-01-17 1986-08-13 VSL International AG Zwischenankeranordnung zum Vorspannen von Bauteilen, die in mehreren Bauetappen erstellt werden, und ein Verfahren zum Herstellen einer solchen Zwischenankeranordnung
US4821474A (en) * 1987-08-24 1989-04-18 Alan Rodriguez Post-tensioning anchor
FR2678036A1 (fr) * 1991-06-20 1992-12-24 Kley France Dispositif de blocage pour cable sous tension.

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE512495A (enrdf_load_stackoverflow) *
GB666506A (en) * 1949-02-14 1952-02-13 Nat Res Dev Improvements relating to clamp devices
FR1062743A (fr) * 1952-09-05 1954-04-27 Preload Co Procédé et dispositif de précontrainte d'armatures coudées
FR1149476A (fr) * 1955-03-21 1957-12-26 Evg Entwicklung Verwert Ges éléments tendeurs ou d'ancrage et barres d'armature du béton
FR1464818A (fr) * 1965-11-24 1967-01-06 Cie Ind De Travaux Dispositif d'ancrage pour béton précontraint
DE2515423A1 (de) * 1974-04-26 1975-11-13 Felten & Guilleaume Ag Oester Verankerungsvorrichtung fuer verbundstraenge aus einem kunststoffkoerper und in diesen eingebetteten insbesondere parallelen draehten
FR2426127A1 (fr) * 1978-05-16 1979-12-14 Boonman Cornelis Construction d'ancrage pour elements de precontrainte
GB2077343A (en) * 1980-05-24 1981-12-16 Strabag Bau Ag Anchorage devices for a bundle of tension wires
EP0190989A1 (de) * 1985-01-17 1986-08-13 VSL International AG Zwischenankeranordnung zum Vorspannen von Bauteilen, die in mehreren Bauetappen erstellt werden, und ein Verfahren zum Herstellen einer solchen Zwischenankeranordnung
US4821474A (en) * 1987-08-24 1989-04-18 Alan Rodriguez Post-tensioning anchor
FR2678036A1 (fr) * 1991-06-20 1992-12-24 Kley France Dispositif de blocage pour cable sous tension.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2818676A1 (fr) * 2000-12-27 2002-06-28 Freyssinet Int Stup Procede de demontage d'un cable de precontrainte et dispositif pour la mise en oeuvre
US6701599B2 (en) 2000-12-27 2004-03-09 Freyssinet International (Stup) Method for demounting a prestressing cable
CN102373770A (zh) * 2011-11-21 2012-03-14 华汇工程设计集团股份有限公司 一种钢绞线端部锚固结构及其锚固方法
CN108221668A (zh) * 2018-02-02 2018-06-29 柳州桂桥缆索有限公司 一种可调式建筑工程用拉索及其张拉方法
CN108221668B (zh) * 2018-02-02 2023-11-24 柳州桂桥缆索有限公司 一种可调式建筑工程用拉索及其张拉方法
ES2735145A1 (es) * 2018-06-12 2019-12-16 Fcc Construccion Sa Sistema y procedimiento de destesado de tirantes por incorporación de, o sustitución por, material de relleno mejorado
FR3157877A1 (fr) * 2023-12-27 2025-07-04 Soletanche Freyssinet Ancrage de substitution

Also Published As

Publication number Publication date
TW235322B (enrdf_load_stackoverflow) 1994-12-01
FR2691737A1 (fr) 1993-12-03
JPH06317020A (ja) 1994-11-15

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