EP0278860A1 - Verankerung mit radialen Ebenen für vorgespannte Bewehrungen, Spanndrähte oder Haltetaue - Google Patents

Verankerung mit radialen Ebenen für vorgespannte Bewehrungen, Spanndrähte oder Haltetaue Download PDF

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Publication number
EP0278860A1
EP0278860A1 EP88400261A EP88400261A EP0278860A1 EP 0278860 A1 EP0278860 A1 EP 0278860A1 EP 88400261 A EP88400261 A EP 88400261A EP 88400261 A EP88400261 A EP 88400261A EP 0278860 A1 EP0278860 A1 EP 0278860A1
Authority
EP
European Patent Office
Prior art keywords
strands
corners
anchoring
grooves
anchoring body
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.)
Withdrawn
Application number
EP88400261A
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English (en)
French (fr)
Inventor
Stanislas Bielecki
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.)
Individual
Original Assignee
Individual
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
Priority claimed from FR8701391A external-priority patent/FR2610342A1/fr
Priority claimed from FR8706227A external-priority patent/FR2614639A2/fr
Application filed by Individual filed Critical Individual
Publication of EP0278860A1 publication Critical patent/EP0278860A1/de
Withdrawn legal-status Critical Current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
    • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action

Definitions

  • the present invention relates to an anchoring device for prestressing cables of a concrete structure, shrouds for suspended structures, or moorings for floating bodies.
  • Anchors for multi-strand cables having a plurality of corners are known in the prestressing technique; said corners receive a strand or a plurality of strands parallel to the axis of the cable between their adjacent sides comprising for this purpose, and for each of the strands, opposite substantially semi-cylindrical grooves; said corners have near their periphery a curved bearing in the form of a male frustoconical sector, the small internal diameter of this truncated cone being external to the bundle of strands forming the cable to be anchored; said corners cooperate with an anchoring body comprising a female truncated cone on which they rest while sliding.
  • the assembly is dimensioned so that the driving force of the corners obtained by the friction in contact with the strands subjected to the tension, it results in a tightening of these strands such that the cable is self-anchored by the action of support cones.
  • the half-grooves of the corners without roughness, sharp teeth or thread capable of biting into the surface of the strands, thus having a low coefficient of friction in contact against said strands, induce a large clamping force obtained by reduction of the angle of the support cone; the corners are then high in order to distribute this force; the conical support area is large and this can result in a large height of the anchoring body, the quantity of resistant material, too, is important.
  • the device according to the invention overcomes the drawbacks said above. To this end it includes one or more of the characteristics among those described below, within a family of corner anchors ranging from the simplest formed of 2 corners enclosing two strands, to the most general to multiple corners enclosing a plurality of strands radially juxtaposed between the opposite faces of said corners, in grooves whose wall is provided with ridges capable of indenting in the strands to be anchored, without altering the minimum characteristics required for the implementation of the cable.
  • a plurality of strands is inserted in opposite striated half-grooves, between the radial sides opposite the corners.
  • These strands are preferably juxtaposed and as close as possible to the axis of the bundle of strands, parallel to this axis; the strands are thus arranged both in radial plies and on cylinders concentric with the bundle forming the cable to be anchored; however, radial arrangements with flared strands following cones of the same angle or not, having the same apex or not, are not excluded.
  • a bundle of strands arranged according to a single cylinder said above constitutes in the anchoring a perfectly articulated system of forces; from two circular cylinders or layers the system enclosing the strands becomes hyperstatic; the difficulty linked to the manufacturing tolerances of the cooperating elements then increases with the number of strands.
  • This difficulty lies essentially in that strands not in contact with the corners can slide without anchoring, mainly during the priming effect of the self-anchoring.
  • the bearing of the corners engages inside the volume delimited by the cylinder or cone forming the template size of the bundle of strands to be anchored, and therefore below the anchoring grooves at the corners.
  • the anchoring body then has a female support cone, facing the bearing surfaces of the corners, provided with radial grooves ensuring the passage of the strands, grooves showing struts supporting all or part of said corners and mobilizing forces radial wedge. This most complex mode results from the combination of multiple grooves grooved by corner with the multiplicity of said corners.
  • G the theoretical fulcrum of a corner
  • ⁇ physical angle of the cone
  • ⁇ friction male / female cones in support
  • This construction including struts appears for the materials usually used in cable anchoring devices of more than twelve strands anchored by more than six corners to at least two grooves juxtaposed by radial force. It is however not excluded that these limits given by way of example are modified in the presence of other materials.
  • the approximately cylindrical external part of the corners situated towards their end outside of the structure receiving the cable force is kept enclosed inside a hoop, after a pre anchor sufficient mechanical; a stop secured to the anchor body firmly holds the hoop-wedge assembly in functional contact against this anchor body.
  • the hoop is replaced by a split cylindrical ring which is forcibly engaged against the cylindrical outside of the corners and the internal cylindrical wall arranged for this purpose in the anchoring body which then becomes hoop.
  • the anchor shown in Figures 1 to 3 has eighteen corners (1) enclosing between their opposite half-grooves (10) the one hundred and eighty strands (8) of a cable arranged in eighteen radial plies of each ten strands. These half-grooves (10) have their helically threaded wall; the sharp point (19) of the net is capable of biting into the strands (8).
  • the corners (1) each have a bearing surface (3) located under the grooves (10) at the end of a short strut (5) and inside the fictitious cone enveloping the bundle of strands (8) .
  • the anchoring body (2) has a female cone (4) which cooperates by pressing and sliding with the bearing surfaces (3) of the corners; radial grooves (11) allow the strands (8) to pass through said female cone, and thus make struts (6) appear in opposition with the legs (5).
  • the prestressing force is transmitted here to the concrete structure (15) by the enlarged bearing face (9) of the body (2).
  • Ten strands are housed between the two faces opposite two juxtaposed corners, in half-grooves whose diameter of the fictitious internal cylinder at the acute point (19) of the thread (10) is slightly less than the outside diameter of the strand to be anchored.
  • the pinching effect thus obtained appears in FIG. 4 in which two facing half-grooves are exaggeratedly offset, thus simulating an offset allowed by the manufacturing tolerances; the pinching of a strand between the diametrically opposite vertices (14) of the half-grooves generates, from the theoretical clamping force F due to the wedge system, a force S normal to the strand in contact, substantially greater than F, and capable indent the thread in said strand.
  • This pinching is caused by a sufficient depression of all the corners by pressing on their upper face (13) using an auxiliary jack or by simple striking with the mass; said pinching ensures excess tightening for each of the strands during the initiation of the self-anchoring effect, until the subsequent plastic deformation of said strands also distributes the overall clamping force between each of them.
  • the anchor shown in FIGS. 5 and 6 comprises two corners enclosing two strands together forming a truncated cone cut diametrically and each comprising, in relation to opposition, two juxtaposed striated half-grooves.
  • the anchor shown in Figures 7 and 8 has six corners enclosing between each of their opposite radial faces two strands in two juxtaposed striated half-grooves arranged in two concentric rings.
  • the anchor shown in FIGS. 9 and 10 comprises 9 corners enclosing between each of their opposite radial faces two strands in two half grooves (10) juxtaposed ridged arranged in two concentric rings.
  • the corners (1) each have a part of their bearing surface (3) located on the grooves (10) at the end of a short strut (5) and inside the cone or fictitious cylinder (7) wrapping the bundle of strands (8).
  • the anchoring body (2) has a female cone (4) partially cut out by radial grooves (11); these grooves allow the passage of the strands (8) external to the cable through said female cone, thus making the struts (6) appear in opposition with the legs (5).
  • FIG. 11 represents a coupler making it possible to extend a first part of post-tensioned prestressed concrete structure (15), here located on the left of the figure, by a second part (16) produced posteriorly and here represented on the right.
  • the first cable composed of thirty-six strands (8) is normally stretched by its end passing through the primary part of the coupler; the first anchoring constituted by the corners (1) and the anchoring body (2) is then said to be "active" and behaves as said further.
  • the second cable is then put in place thanks to the second anchoring comprising the corners (1bis) and the anchoring body (2bis); the coupling of the two cables is obtained by screwing a sleeve (17) in the two anchoring bodies (2) and (2bis); the concrete of the structure (16) being poured in place, it is clear that the so-called “passive” or “dead” anchoring of the second cable is inaccessible and that said cable must be stretched by its other end; it will then be impossible to initiate the self-anchoring effect by driving in the corners (2bis) which therefore risk letting the strands escape.
  • the passive end is pre-anchored by driving the corners (1a) into the anchoring body (2a) with a force such that the risk of slipping is eliminated due to sufficient indentation of the ridges lining the grooves (10bis), and of an almost definitive transverse plastic deformation of the strands.
  • a ring (18) is then pressed so as to hoop the corners at their substantially cylindrical part (12) thus forming a fixed head; said head is finally firmly pre-locked in the anchoring body (2bis) by screwing the connection sleeve (17) against the hoop (18).
  • the elements (1bis), (2bis), (17) and (18) can constitute an anchorage for a guyed suspended work or for a mooring of a floating body, provided with arrangements suited to the uses. Large variations in the tensile stress in the cable can be allowed, without risk of anchoring the strands, thanks to the pre-anchoring of the corners firmly maintained in the functional position.
  • the anchorage shown in FIGS. 1, 5, 7 and 9 can also be provided with the hoop (18) and with a stop (17) which can advantageously be a cover held integral with the anchoring body (2) by screws .
  • This anchoring thus equipped, embedded in the mass of concrete and whose cable is held by the opposite end is called "passive dead anchoring".

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP88400261A 1987-02-04 1988-02-04 Verankerung mit radialen Ebenen für vorgespannte Bewehrungen, Spanndrähte oder Haltetaue Withdrawn EP0278860A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8701391A FR2610342A1 (fr) 1987-02-04 1987-02-04 Dispositif d'ancrage en nappes radiales pour armatures de precontrainte, haubans ou amarres
FR8701391 1987-02-04
FR8706227 1987-04-03
FR8706227A FR2614639A2 (fr) 1987-04-30 1987-04-30 Dispositif d'ancrage en nappes radiales pour armatures de precontrainte, haubans ou amarres

Publications (1)

Publication Number Publication Date
EP0278860A1 true EP0278860A1 (de) 1988-08-17

Family

ID=26225753

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88400261A Withdrawn EP0278860A1 (de) 1987-02-04 1988-02-04 Verankerung mit radialen Ebenen für vorgespannte Bewehrungen, Spanndrähte oder Haltetaue
EP19880901613 Withdrawn EP0314708A1 (de) 1987-02-04 1988-02-04 Verankerung mit radialen ebenen für vorgespannte bewehrungen, spanndrähten oder haltetaue

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19880901613 Withdrawn EP0314708A1 (de) 1987-02-04 1988-02-04 Verankerung mit radialen ebenen für vorgespannte bewehrungen, spanndrähten oder haltetaue

Country Status (3)

Country Link
EP (2) EP0278860A1 (de)
AU (1) AU1292688A (de)
WO (1) WO1988005851A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59306005D1 (de) * 1992-03-24 1997-05-07 Vsl Int Ag Kraftübertragungskörper für eine Verankerung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1452219A (fr) * 1965-07-28 1966-02-25 Stup Procedes Freyssinet Dispositif d'ancrage pour armatures de précontrainte
FR1503134A (fr) * 1966-12-01 1967-11-24 Clavette à <<serrage circulaire>> pour le blocage d'ensemble de fils, barres ou câbles tendus
DE2031007A1 (de) * 1969-06-24 1971-03-04 Societe Technique pour lUtilisa tion de la Precontrainte, Boulogne Billancourt (Frankreich) Vorrichtung zum Verankern von Spann drahtkabeln
FR2311905A1 (fr) * 1975-05-23 1976-12-17 Holzmann Philipp Ag Dispositif d'ancrage par serrage pour des organes de precontrainte, en particulier pour beton precontraint
FR2426127A1 (fr) * 1978-05-16 1979-12-14 Boonman Cornelis Construction d'ancrage pour elements de precontrainte

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1452219A (fr) * 1965-07-28 1966-02-25 Stup Procedes Freyssinet Dispositif d'ancrage pour armatures de précontrainte
FR1503134A (fr) * 1966-12-01 1967-11-24 Clavette à <<serrage circulaire>> pour le blocage d'ensemble de fils, barres ou câbles tendus
DE2031007A1 (de) * 1969-06-24 1971-03-04 Societe Technique pour lUtilisa tion de la Precontrainte, Boulogne Billancourt (Frankreich) Vorrichtung zum Verankern von Spann drahtkabeln
FR2311905A1 (fr) * 1975-05-23 1976-12-17 Holzmann Philipp Ag Dispositif d'ancrage par serrage pour des organes de precontrainte, en particulier pour beton precontraint
FR2426127A1 (fr) * 1978-05-16 1979-12-14 Boonman Cornelis Construction d'ancrage pour elements de precontrainte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BETON- UND STAHLBETONBAU, vol. 51, no. 5, mai 1956, pages 97-104, Berlin, DE; W. ERDMANN: "Umbau der Gr}nauer Strassen}berf}hrung in Passau mit einer schiefwinkligen Spannbetonplatte" *

Also Published As

Publication number Publication date
WO1988005851A1 (fr) 1988-08-11
EP0314708A1 (de) 1989-05-10
AU1292688A (en) 1988-08-24

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