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EP2649239A2 - Device for diverting a structural cable, such as a guy line, and construction comprising same - Google Patents

Device for diverting a structural cable, such as a guy line, and construction comprising same

Info

Publication number
EP2649239A2
EP2649239A2 EP11811045.1A EP11811045A EP2649239A2 EP 2649239 A2 EP2649239 A2 EP 2649239A2 EP 11811045 A EP11811045 A EP 11811045A EP 2649239 A2 EP2649239 A2 EP 2649239A2
Authority
EP
European Patent Office
Prior art keywords
strand
duct
section
support zone
cross
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.)
Granted
Application number
EP11811045.1A
Other languages
German (de)
French (fr)
Other versions
EP2649239B1 (en
Inventor
Erik Mellier
Stéphane JOYE
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.)
Soletanche Freyssinet SA
Original Assignee
Soletanche Freyssinet 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 Soletanche Freyssinet SA filed Critical Soletanche Freyssinet SA
Priority to PL11811045T priority Critical patent/PL2649239T3/en
Publication of EP2649239A2 publication Critical patent/EP2649239A2/en
Application granted granted Critical
Publication of EP2649239B1 publication Critical patent/EP2649239B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports

Definitions

  • the present invention relates to the devices used to deflect structural cables, including guy wires. It is common to make structural cables in the form of bundles of individual strands stretched and anchored at their ends. The design of a construction work may cause the cable to be deflected in one or more areas of its layout.
  • the cables In guyed structures, the cables have an upper portion located at a pylon and lower ends anchored on the suspended structure, for example the deck of a bridge. In a traditional design, each cable has its upper end anchored on the pylon.
  • guyed structures in which the cables follow paths of generally inverted V shape, being deflected on the pylon using a device commonly called saddle.
  • the strands of the cable follow curved paths, typically following a substantially constant radius of curvature.
  • the strands extend uninterruptedly along the saddle. It is necessary to ensure sufficient friction of the strands on the saddle to avoid unwanted sliding.
  • WO 2007/121782 A1 describes a saddle in which each strand forming a strand of the cable is received in an individual conduit whose wall has, on either side of the plane containing the curved path of the strand, two inclined faces giving The V-shaped section of the duct section blocks the strand by wedging when it is tensioned by the load of the structure.
  • This saddle design is not without drawbacks.
  • the contacts between the strand and the wall of its conduit are punctual, which is not conducive to a good distribution of local constraints.
  • the saddle is not compatible with the use of individually wrapped strands because the individual sheath of a strand would be damaged by the jamming force generated by the V-shaped duct.
  • An object of the present invention is to provide another saddle design that reduces the incidence of the above problems, including ensuring adequate transmission of stresses within the curved path followed by the strands.
  • the invention thus proposes a device for deflecting a structural cable comprising several stretched strands.
  • the device comprises a body traversed by conduits.
  • Each duct has a wall for guiding one of the strands along a curved path.
  • the wall of the duct has a support zone of the strand directed inwardly of the curvature of the path, which support zone has, at least in a central portion of the duct and transversely to the curved path, an arcuate section of circle of radius substantially equal to half the outer diameter of the strand.
  • the central portion of the duct has an enlarged cross section outside the support zone.
  • the deflection device makes it possible to use strands each comprising a metal strand and a plastic sheath surrounding the strand. The sheath can then be uninterrupted through the saddle and cable anchors, being applied against the support area of the duct wall. It has been determined that an angular sector of at least 60 ° for the arcuate shape of the section of the support zone provides sufficient frictional locking in many configurations. This angular sector may in particular be between 90 and 120 °.
  • the ducts have a sufficient section to allow threading without difficulty strands. This property can be obtained by giving them a cross section sufficient to contain a circle with a diameter of at least 2 mm greater than the outer diameter of the strand.
  • the shape of the cross section of the central portion of the duct outside the support zone may be that of a vault diameter greater than the outer diameter of the strand.
  • a vault shape for example circular, avoids undesirable concentrations of stress in the material located between the individual conduits of the device.
  • the conduit so that its cross section flares outwardly on at least one side of its central part.
  • the flare may in particular follow, on the inner side of the curvature of the path, a substantially circular generative line of radius less than the radius of curvature of the path in the central portion of the conduit.
  • the deflection device further comprises a curved tube for receiving the structural cable, the body provided with the ducts being housed inside the curved tube.
  • Another aspect of the invention relates to a construction work, such as a cable-stayed bridge, comprising at least one structural cable comprising several strands stretched, the anchors of the strands. at the ends of the cable, and at least one device for deflecting the cable between the two anchors, this device being as defined above.
  • FIG. 1 is a diagram of a cable-stayed bridge to which the invention can be applied;
  • FIG. 2 is a very schematic view of a stay equipped with an embodiment of the deflection device
  • FIG. 3 is an axial sectional view of a conduit belonging to the deflection device
  • FIG. 4 is a cross-sectional view of the deflection device along the plane IV-IV indicated in FIG. 3;
  • FIG. 5 is a cross-sectional view of a conduit in which is housed a strand of the cable.
  • Figure 6 is a view similar to that of Figure 5, showing the conduit and the strand in a cable installation phase.
  • FIG. 1 The construction example shown in Figure 1 consists of a cable-stayed bridge.
  • the deck 1 of such a bridge is traditionally carried by one or more towers 2 via stays 3 along inclined paths between the pylon and the deck.
  • each stay 3 passes through a deflection device 5 made according to the invention, hereinafter called saddle.
  • the seat 5 comprises a curved metal tube 6 embedded in the concrete which is made of the pylon 2.
  • the curved tube 6 has for example been shaped by bending a steel tube, then placed in the appropriate geometric configuration before pouring the concrete of the tower 2.
  • the structure cable is here formed by a stay 3 consisting of several strands 4 stretched through the saddle 5 without interruption.
  • the strands 4 preferably consist of individually sheathed strands, the metal strand and its plastic sheath. both being uninterrupted inside the saddle 5.
  • each strand 4 follows a curved path T ( Figure 3) defined by an individual duct 10.
  • the ducts 10 are formed in a body 7 of molded material housed inside the curved tube 6. Outside the saddle 5, the stay 3 extends freely to the two anchors 8 installed on the deck 1. These anchors 8 may for example be in accordance with that described in WO 00/75453 A1.
  • the ducts 10 formed in the saddle 5 each receive a respective sheathed strand 4. In their central part, they preferably follow a curved path T of constant radius R.
  • the cross section of the duct 10 has, for example the shape shown in Figure 4, wherein the duct wall has a support zone 1 1 directed inwardly of the curvature of the path T.
  • the shape of the support zone 1 1 is in an arc of radius r.
  • the radius r of the arcuate shape of the support zone 1 1 in the central portion of the conduit 10 corresponds to half the outer diameter of the strand 4.
  • the support area 1 1 provides a relatively large contact area between the wall of the duct 10 and the periphery of the strand 4, which generates a proper frictional force to maintain the strand in position when it is tensioned by the load of the 'work.
  • the angular sector on which the support zone extends is advantageously at least 60 °. Optimally, this angular aperture a is between 90 ° and 120 °.
  • the upper portion 12 of the wall of the duct 10, outwardly of its curvature, is wider than the support zone to allow the smooth introduction of the strand 4 during assembly of the stay.
  • This widening of the central part of the duct outside the support zone January 1 can be achieved by giving the upper portion 12 a vault-shaped cross section of diameter greater than the outer diameter of the strand. It has been determined that the insertion of the strand 4 into the duct takes place without any problem when the cross section of the duct, in its central part, is sufficient to contain a circle C of diameter greater than minus 2 mm to the outer diameter of strand 4, as shown in Figure 6.
  • the strand 4 can be threaded into its duct without rubbing on the saddle 5.
  • a removable shim 15 for example in the form of a plastic ribbon, beforehand. threading.
  • the arch shape of the upper part 12 of the wall of the conduit 10 may in particular have a circular profile of radius r '> r, radial shoulders 13 then connecting the support zone 1 1 to the upper portion 12.
  • the rounded shape of the vault is favorable to the vertical flow of the compressive stresses in the molded matrix 7 of the saddle 5.
  • the cross section of the duct 10 flares outwardly on either side of the central portion. This flare, visible in FIG. 3, makes it possible to guide the deviations of the strands which result from load variations in the cables.
  • the flaring of the cross section of the conduit 10 may follow a generatrix line whose shape is advantageously circular with a radius R 'less than the radius of curvature R of the path T in the central part of the duct 10.
  • the fact that the radius R 'is constant makes it possible to limit the bending stresses to which the strands 4 are subjected.
  • the flaring of the cross section of the duct 10 at its two ends may result from a homothety of the form shown in Figure 4.
  • a variant consists in progressively widening outwardly the inner portion of the section of the led to make it tend towards the circle of radius r 'on the outer face of the saddle 5.
  • Another variant consists in placing, on either side of the central portion of constant section of the duct 10, a cross-sectional flare circular, trumpet-shaped, whose smallest diameter is equal to r '. In this way, the flaring can simply be achieved by a guide piece formed by machining and placed at the mouth of the duct 10.
  • the central portion of the ducts 10 may be made by molding in the material 7, for example a filling mortar, constituting the matrix of the seat 5.
  • An advantage of the saddle 5 described above is that it is compatible with the use of strands 4 constituted by individually wrapped strands.
  • the section of such a strand 4 is shown in Figures 5 and 6, where the reference 16 designates the twisted metal son of the strand, and the reference 17 designates the plastic sheath that surrounds these son.
  • the wires 16 are typically made of galvanized steel while the sheath 17 is made of high density polyethylene (HDPE).
  • HDPE high density polyethylene
  • a flexible filling material fills the interstices between the wires 16 and those between the wires 16 and the sheath 17.
  • the sheathed strand 4 shown in Figures 5 and 6 has a circular outer section.
  • the support zone 1 1 of the ducts 10 is then dimensioned to have the same radius r as that of the sheathed strand 4.
  • the outer section of the strand 4 is not exactly circular but, for example, hexagonal rounded corners due to the extrusion of the sheath 17 on the metal strand.
  • the "outer diameter of the strand” should be understood as the diameter of the smallest circle in which the cross-section of the strand is inscribed. This definition of "outer diameter of the strand” also applies in the case of a metallic strand unsheathed. Although not preferred, the latter case may fall within the scope of the invention, the contacts between the stretched strand and the support zone January 1 of its conduit then being in spiral lines rather than punctual.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Details Of Indoor Wiring (AREA)
  • Ropes Or Cables (AREA)

Abstract

The invention relates to a structural cable comprising multiple stretched strands (4). The cable is diverted in a device having a body through which passages (10) extend. Each passage has a wall for guiding one of the strands along a curved path. The wall of the passage includes a strand-supporting area (11) oriented towards the interior of the curvature of the path. The cross-section of the supporting area, transverse to the curved path and in the central part of the passage, takes the form of an arc of circle having a radius substantially equal to half of the outside diameter of the strand. The cross-section of the central part of the passage is larger outside of the supporting area.

Description

DISPOSITIF DE DEVIATION D'UN CABLE DE STRUCTURE  DEVIATION DEVICE FOR A STRUCTURE CABLE

TEL QU'UN HAUBAN, ET OUVRAGE AINSI EQUIPE  SUCH AS A HAUBAN, AND WORK SO EQUIPPED

[0001] La présente invention concerne les dispositifs employés pour dévier des câbles de structure, notamment des haubans. [0002] Il est courant de réaliser des câbles de structure sous forme de faisceaux de brins individuels tendus et ancrés à leurs extrémités. La conception d'un ouvrage de construction peut amener à faire dévier le câble dans une ou plusieurs zones de son tracé. The present invention relates to the devices used to deflect structural cables, including guy wires. It is common to make structural cables in the form of bundles of individual strands stretched and anchored at their ends. The design of a construction work may cause the cable to be deflected in one or more areas of its layout.

[0003] Dans les ouvrages haubanés, les câbles ont une partie supérieure située au niveau d'un pylône et des extrémités inférieures ancrées sur la structure suspendue, par exemple le tablier d'un pont. Dans une conception traditionnelle, chaque câble a son extrémité supérieure ancrée sur le pylône. On rencontre aussi des ouvrages haubanés dans lesquels les câbles suivent des trajets de forme générale en V inversé, en étant déviés sur le pylône à l'aide d'un dispositif communément appelé selle. In guyed structures, the cables have an upper portion located at a pylon and lower ends anchored on the suspended structure, for example the deck of a bridge. In a traditional design, each cable has its upper end anchored on the pylon. There are also guyed structures in which the cables follow paths of generally inverted V shape, being deflected on the pylon using a device commonly called saddle.

[0004] Au niveau de la selle, les brins du câble suivent des trajets incurvés, typiquement suivant un rayon de courbure sensiblement constant. Avantageusement, les brins s'étendent de manière ininterrompue le long de la selle. Il convient d'assurer un frottement suffisant des brins sur la selle afin d'éviter des coulissements indésirables. At the saddle, the strands of the cable follow curved paths, typically following a substantially constant radius of curvature. Advantageously, the strands extend uninterruptedly along the saddle. It is necessary to ensure sufficient friction of the strands on the saddle to avoid unwanted sliding.

[0005] WO 2007/121782 A1 décrit une selle dans laquelle chaque toron formant un brin du câble est reçu dans un conduit individuel dont la paroi présente, de part et d'autre du plan contenant le trajet courbe du toron, deux faces inclinées donnant au conduit une section générale en V. La forme en V de la section du conduit bloque le toron par effet de coin lorsqu'il est mis en tension par la charge de l'ouvrage. Cette conception de selle n'est pas sans inconvénients. En particulier, les contacts entre le toron et la paroi de son conduit sont ponctuels, ce qui n'est pas favorable à une bonne répartition des contraintes locales. En outre, la selle n'est pas compatible avec l'emploi de torons individuellement gainés car la gaine individuelle d'un toron serait endommagée par l'effort de coincement engendré par le profil en V du conduit. Pourtant ces torons individuellement gainés sont très souvent préférés pour la réalisation de câbles de structure car leur résistance à la corrosion est renforcée par l'isolation conférée la gaine. Si on veut néanmoins utiliser de tels torons avec la selle de WO 2007/121782 A1 , il faut retirer les gaines sur les longueurs des torons placées à l'intérieur de la selle, ce qui requiert la mise en œuvre de mesures spéciales pour isoler suffisamment le métal des torons. Malgré ces mesures, qui peuvent être complexes et coûteuses, le dénudage des brins à l'approche de la selle risque de constituer une faiblesse dans la protection anticorrosion des haubans. [0008] Un but de la présente invention est de proposer une autre conception de selle qui réduise l'incidence des problèmes ci-dessus, notamment en assurant une transmission adéquate des contraintes à l'intérieur du trajet courbe suivi par les brins. [0005] WO 2007/121782 A1 describes a saddle in which each strand forming a strand of the cable is received in an individual conduit whose wall has, on either side of the plane containing the curved path of the strand, two inclined faces giving The V-shaped section of the duct section blocks the strand by wedging when it is tensioned by the load of the structure. This saddle design is not without drawbacks. In particular, the contacts between the strand and the wall of its conduit are punctual, which is not conducive to a good distribution of local constraints. In addition, the saddle is not compatible with the use of individually wrapped strands because the individual sheath of a strand would be damaged by the jamming force generated by the V-shaped duct. However, these individually wrapped strands are very often preferred for the production of structural cables because their resistance to corrosion is enhanced by the insulation imparted to the sheath. If one nevertheless wants to use such strands with the seat of WO 2007/121782 A1, it is necessary to remove the sheaths on the lengths of the strands placed inside the saddle, which requires the implementation of special measures to isolate sufficiently the metal of the strands. Despite these measures, which can be complex and costly, the stripping of the strands at the approach of the saddle may be a weakness in the corrosion protection of the stays. An object of the present invention is to provide another saddle design that reduces the incidence of the above problems, including ensuring adequate transmission of stresses within the curved path followed by the strands.

[Q007] L'invention propose ainsi un dispositif de déviation d'un câble de structure comportant plusieurs brins tendus. Le dispositif comprend un corps traversé de conduits. Chaque conduit a une paroi pour guider un des brins selon un trajet courbe. La paroi du conduit comporte une zone de support du brin dirigée vers l'intérieur de la courbure du trajet, laquelle zone de support présente, au moins dans une partie centrale du conduit et transversalement au trajet courbe, une section en forme d'arc de cercle de rayon sensiblement égal à la moitié du diamètre extérieur du brin. La partie centrale du conduit a une section transversale élargie en dehors de la zone de support. The invention thus proposes a device for deflecting a structural cable comprising several stretched strands. The device comprises a body traversed by conduits. Each duct has a wall for guiding one of the strands along a curved path. The wall of the duct has a support zone of the strand directed inwardly of the curvature of the path, which support zone has, at least in a central portion of the duct and transversely to the curved path, an arcuate section of circle of radius substantially equal to half the outer diameter of the strand. The central portion of the duct has an enlarged cross section outside the support zone.

[0008] Le maintien des brins dans leur conduit, empêchant leur coulissement le long du trajet courbe, résulte du frottement du brin dans la zone de support de la paroi du conduit qui peut avoir une rugosité plus ou moins marquée. Le brin est au contact de cette zone de support sur une surface ayant une certaine étendue compte tenu de la forme en arc de cercle de rayon adapté au brin. Il est pressé contre cette zone de support par la tension appliquée sur le câble. [0009] Grâce à la bonne répartition des contraintes transmises entre les brins et la paroi de leurs conduits, le dispositif de déviation permet d'utiliser des brins comportant chacun un toron métallique et une gaine en matière plastique entourant le toron. La gaine peut alors être ininterrompue à travers la selle et jusqu'aux ancrages du câble, en étant appliquée contre la zone de support de la paroi du conduit. [0010] Il a été déterminé qu'un secteur angulaire d'au moins 60° pour la forme en arc de cercle de la section de la zone de support procure un blocage par frottement suffisant dans de nombreuses configurations. Ce secteur angulaire peut notamment être compris entre 90 et 120°. Maintaining the strands in their conduit, preventing their sliding along the curved path, results from the friction of the strand in the support zone of the duct wall which may have a roughness more or less marked. The strand is in contact with this support zone on a surface having a certain extent given the arcuate shape of radius adapted to the strand. It is pressed against this support zone by the tension applied on the cable. Thanks to the good distribution of the stresses transmitted between the strands and the wall of their ducts, the deflection device makes it possible to use strands each comprising a metal strand and a plastic sheath surrounding the strand. The sheath can then be uninterrupted through the saddle and cable anchors, being applied against the support area of the duct wall. It has been determined that an angular sector of at least 60 ° for the arcuate shape of the section of the support zone provides sufficient frictional locking in many configurations. This angular sector may in particular be between 90 and 120 °.

[0011] Il convient généralement que les conduits présentent une section suffisante pour permettre un enfilage sans difficulté des brins. Cette propriété peut être obtenue en leur conférant une section transversale suffisante pour contenir un cercle de diamètre supérieur d'au moins 2 mm au diamètre extérieur du brin. It is generally appropriate that the ducts have a sufficient section to allow threading without difficulty strands. This property can be obtained by giving them a cross section sufficient to contain a circle with a diameter of at least 2 mm greater than the outer diameter of the strand.

[0012] La forme de la section transversale de la partie centrale du conduit en dehors de la zone de support peut être celle d'une voûte de diamètre supérieur au diamètre extérieur du brin. Une forme de voûte, par exemple circulaire, évite des concentrations indésirables de contraintes dans la matière située entre les conduits individuels du dispositif. The shape of the cross section of the central portion of the duct outside the support zone may be that of a vault diameter greater than the outer diameter of the strand. A vault shape, for example circular, avoids undesirable concentrations of stress in the material located between the individual conduits of the device.

[0013] Pour tolérer une marge de variation angulaire du câble sur l'un ou l'autre des côtés du dispositif, on peut former le conduit de façon que sa section transversale s'évase vers l'extérieur sur au moins un côté de sa partie centrale. L'évasement peut notamment suivre, sur le côté intérieur de la courbure du trajet, une ligne génératrice sensiblement circulaire de rayon inférieur au rayon de courbure du trajet dans la partie centrale du conduit. [0014] Dans un mode de réalisation, le dispositif de déviation comprend en outre un tube courbe pour recevoir le câble de structure, le corps pourvu des conduits étant logé à l'intérieur du tube courbe. To tolerate a margin of angular variation of the cable on one or the other side of the device, one can form the conduit so that its cross section flares outwardly on at least one side of its central part. The flare may in particular follow, on the inner side of the curvature of the path, a substantially circular generative line of radius less than the radius of curvature of the path in the central portion of the conduit. In one embodiment, the deflection device further comprises a curved tube for receiving the structural cable, the body provided with the ducts being housed inside the curved tube.

[0015] Un autre aspect de l'invention se rapporte à un ouvrage de construction, comme par exemple un pont à haubans, comprenant au moins un câble de structure comportant plusieurs brins tendus, des ancrages des brins aux extrémités du câble, et au moins un dispositif de déviation du câble entre les deux ancrages, ce dispositif étant tel que défini ci-dessus. Another aspect of the invention relates to a construction work, such as a cable-stayed bridge, comprising at least one structural cable comprising several strands stretched, the anchors of the strands. at the ends of the cable, and at least one device for deflecting the cable between the two anchors, this device being as defined above.

[0016] D'autres particularités et avantages de la présente invention apparaîtront dans la description ci-après d'un exemple de réalisation non limitatif, en référence aux dessins annexés, dans lesquels: Other features and advantages of the present invention will appear in the following description of a non-limiting embodiment, with reference to the accompanying drawings, in which:

- la figure 1 est un schéma d'un pont à haubans auquel l'invention peut s'appliquer;  FIG. 1 is a diagram of a cable-stayed bridge to which the invention can be applied;

- la figure 2 est une vue très schématique d'un hauban équipé d'un mode de réalisation du dispositif de déviation;  - Figure 2 is a very schematic view of a stay equipped with an embodiment of the deflection device;

- la figure 3 est une vue en coupe axiale d'un conduit appartenant au dispositif de déviation;  - Figure 3 is an axial sectional view of a conduit belonging to the deflection device;

- la figure 4 est une vue en coupe transversale du dispositif de déviation, suivant le plan IV-IV indiqué sur la figure 3;  FIG. 4 is a cross-sectional view of the deflection device along the plane IV-IV indicated in FIG. 3;

- la figure 5 est une vue en coupe transversale d'un conduit dans lequel est logé un brin du câble; et  - Figure 5 is a cross-sectional view of a conduit in which is housed a strand of the cable; and

- la figure 6 est une vue semblable à celle de la figure 5, montrant le conduit et le brin dans une phase d'installation du câble.  - Figure 6 is a view similar to that of Figure 5, showing the conduit and the strand in a cable installation phase.

[0017] L'exemple de réalisation d'ouvrage de construction représenté sur la figure 1 consiste en un pont à haubans. Le tablier 1 d'un tel pont est traditionnellement porté par un ou plusieurs pylônes 2 par l'intermédiaire de haubans 3 suivant des trajets inclinés entre le pylône et le tablier. Au niveau du pylône 2, chaque hauban 3 traverse un dispositif de déviation 5 réalisé conformément à l'invention, ci-après appelé selle. The construction example shown in Figure 1 consists of a cable-stayed bridge. The deck 1 of such a bridge is traditionally carried by one or more towers 2 via stays 3 along inclined paths between the pylon and the deck. At the pylon 2, each stay 3 passes through a deflection device 5 made according to the invention, hereinafter called saddle.

[0018] Dans le mode de réalisation représenté sur la figure 2, la selle 5 comporte un tube métallique courbe 6 noyé dans le béton dont est fait le pylône 2. Le tube courbe 6 a par exemple été mis en forme par cintrage d'un tube en acier, puis placé dans la configuration géométrique appropriée avant de couler le béton du pylône 2. Le câble de structure est ici formé par un hauban 3 composé de plusieurs brins tendus 4 qui traversent la selle 5 sans interruption. Les brins 4 consistent de préférence en des torons individuellement gainés, le toron métallique et sa gaine en matière plastique étant tous deux ininterrompus à l'intérieur de la selle 5. A travers cette selle, chaque brin 4 suit un trajet courbe T (figure 3) défini par un conduit individuel 10. Les conduits 10 sont formés dans un corps 7 en matière moulée logé à l'intérieur du tube courbe 6. [0019] A l'extérieur de la selle 5, le hauban 3 s'étend librement jusqu'aux deux ancrages 8 installés sur le tablier 1 . Ces ancrages 8 peuvent par exemple être conformes à celui décrit dans WO 00/75453 A1 . In the embodiment shown in Figure 2, the seat 5 comprises a curved metal tube 6 embedded in the concrete which is made of the pylon 2. The curved tube 6 has for example been shaped by bending a steel tube, then placed in the appropriate geometric configuration before pouring the concrete of the tower 2. The structure cable is here formed by a stay 3 consisting of several strands 4 stretched through the saddle 5 without interruption. The strands 4 preferably consist of individually sheathed strands, the metal strand and its plastic sheath. both being uninterrupted inside the saddle 5. Through this saddle, each strand 4 follows a curved path T (Figure 3) defined by an individual duct 10. The ducts 10 are formed in a body 7 of molded material housed inside the curved tube 6. Outside the saddle 5, the stay 3 extends freely to the two anchors 8 installed on the deck 1. These anchors 8 may for example be in accordance with that described in WO 00/75453 A1.

[0020] Les conduits 10 ménagés dans la selle 5 reçoivent chacun un toron gainé respectif 4. Dans leur partie centrale, ils suivent de préférence un trajet courbe T de rayon constant R. Dans cette partie, la section transversale du conduit 10 a par exemple la forme représentée sur la figure 4, où la paroi du conduit présente une zone de support 1 1 dirigée vers l'intérieur de la courbure du trajet T. La forme de la zone de support 1 1 est en arc de cercle de rayon r. The ducts 10 formed in the saddle 5 each receive a respective sheathed strand 4. In their central part, they preferably follow a curved path T of constant radius R. In this part, the cross section of the duct 10 has, for example the shape shown in Figure 4, wherein the duct wall has a support zone 1 1 directed inwardly of the curvature of the path T. The shape of the support zone 1 1 is in an arc of radius r.

[0021] Comme le montrent les figures 4 et 5, le rayon r de la forme en arc de cercle de la zone de support 1 1 dans la partie centrale du conduit 10 correspond à la moitié du diamètre extérieur du brin 4. Ainsi, la zone de support 1 1 offre une surface de contact relativement étendue entre la paroi du conduit 10 et la périphérie du brin 4, qui engendre un effort de frottement propre à maintenir le brin en position lorsqu'il est mis en tension par la charge de l'ouvrage. Le secteur angulaire a sur lequel s'étend la zone de support est avantageusement d'au moins 60°. De manière optimale, cette ouverture angulaire a est comprise entre 90° et 120°. As shown in Figures 4 and 5, the radius r of the arcuate shape of the support zone 1 1 in the central portion of the conduit 10 corresponds to half the outer diameter of the strand 4. Thus, the support area 1 1 provides a relatively large contact area between the wall of the duct 10 and the periphery of the strand 4, which generates a proper frictional force to maintain the strand in position when it is tensioned by the load of the 'work. The angular sector on which the support zone extends is advantageously at least 60 °. Optimally, this angular aperture a is between 90 ° and 120 °.

[0022] La partie supérieure 12 de la paroi du conduit 10, vers l'extérieur de sa courbure, est plus large que la zone de support afin de permettre l'introduction sans encombre du brin 4 lors du montage du hauban. Cet élargissement de la partie centrale du conduit en dehors de la zone de support 1 1 peut être réalisé en donnant à la partie supérieure 12 une section transversale en forme de voûte de diamètre supérieur au diamètre extérieur du brin. On a déterminé que l'introduction du brin 4 dans le conduit s'effectue sans problème lorsque la section transversale du conduit, dans sa partie centrale, est suffisante pour contenir un cercle C de diamètre supérieur d'au moins 2 mm au diamètre extérieur du brin 4, comme le montre la figure 6. The upper portion 12 of the wall of the duct 10, outwardly of its curvature, is wider than the support zone to allow the smooth introduction of the strand 4 during assembly of the stay. This widening of the central part of the duct outside the support zone January 1 can be achieved by giving the upper portion 12 a vault-shaped cross section of diameter greater than the outer diameter of the strand. It has been determined that the insertion of the strand 4 into the duct takes place without any problem when the cross section of the duct, in its central part, is sufficient to contain a circle C of diameter greater than minus 2 mm to the outer diameter of strand 4, as shown in Figure 6.

[0023] Ainsi, le brin 4 peut être enfilé dans son conduit sans frotter sur la selle 5. À cet effet, on peut disposer une cale amovible 15, par exemple sous la forme d'un ruban de matière plastique, préalablement à l'enfilage. Une fois que le brin 4 est mis en place, la cale 15 est retirée, le brin 4 étant alors déposé dans la zone de support 1 1 . Thus, the strand 4 can be threaded into its duct without rubbing on the saddle 5. For this purpose, it is possible to have a removable shim 15, for example in the form of a plastic ribbon, beforehand. threading. Once the strand 4 is put in place, the wedge 15 is removed, the strand 4 then being deposited in the support zone January 1.

[0024] La forme de voûte de la partie supérieure 12 de la paroi du conduit 10 peut notamment avoir un profil circulaire de rayon r' > r, des épaulements radiaux 13 raccordant alors la zone de support 1 1 à la partie supérieure 12. La forme arrondie de la voûte est favorable à l'écoulement vertical des contraintes de compression régnant dans la matrice moulée 7 de la selle 5. The arch shape of the upper part 12 of the wall of the conduit 10 may in particular have a circular profile of radius r '> r, radial shoulders 13 then connecting the support zone 1 1 to the upper portion 12. The The rounded shape of the vault is favorable to the vertical flow of the compressive stresses in the molded matrix 7 of the saddle 5.

[0025] Dans une réalisation préférée, la section transversale du conduit 10 s'évase vers l'extérieur de part et d'autre de la partie centrale. Cet évasement, visible sur la figure 3, permet de guider les déviations des brins qui résultent des variations de charge dans les câbles. In a preferred embodiment, the cross section of the duct 10 flares outwardly on either side of the central portion. This flare, visible in FIG. 3, makes it possible to guide the deviations of the strands which result from load variations in the cables.

[0026] Sur le côté intérieur de la courbure du trajet T, l'évasement de la section transversale du conduit 10 peut suivre une ligne génératrice dont la forme est avantageusement circulaire avec un rayon R' inférieur au rayon de courbure R du trajet T dans la partie centrale du conduit 10. Le fait que le rayon R' soit constant permet de limiter les contraintes de flexion auxquelles les brins 4 sont soumis. On the inside of the curvature of the path T, the flaring of the cross section of the conduit 10 may follow a generatrix line whose shape is advantageously circular with a radius R 'less than the radius of curvature R of the path T in the central part of the duct 10. The fact that the radius R 'is constant makes it possible to limit the bending stresses to which the strands 4 are subjected.

[0027] L'évasement de la section transversale du conduit 10 à ses deux extrémités peut résulter d'une homothétie de la forme représentée sur la figure 4. Une variante consiste à faire élargir progressivement vers l'extérieur la partie intérieure de la section du conduit pour la faire tendre vers le cercle de rayon r' sur la face extérieure de la selle 5. Une autre variante consiste à placer, de part et d'autre de la partie centrale de section constante du conduit 10, un évasement de section transversale circulaire, en forme de trompette, dont le plus petit diamètre est égal à r'. De cette manière, l'évasement peut être simplement réalisé par une pièce de guidage formée par usinage et placée à l'embouchure du conduit 10. [0028] La partie centrale des conduits 10 peut être réalisée par moulage dans la matière 7, par exemple un mortier de remplissage, constituant la matrice de la selle 5. On dispose alors dans le tube cintré 6 des moules négatifs ayant la forme des conduits 10. Leurs positions et leurs espacements transversaux sont maintenus par des guides régulièrement espacés dans le tube 6. Le tube 6 est alors rempli d'un matériau durcissable tel qu'un mortier à haute résistance. Le décoffrage peut être effectué soit par destruction mécanique des moules, soit par dissolution, soit par rétrécissement. Cette réalisation de la selle par moulage peut être effectuée en usine. Sur le chantier, la selle ainsi réalisée est hissée sur le pylône et mise en place à la position prescrite. Une fois le pylône complété, les brins 4 du hauban sont hissés, enfilés dans la selle 5 puis ancrés sur le tablier 1 . The flaring of the cross section of the duct 10 at its two ends may result from a homothety of the form shown in Figure 4. A variant consists in progressively widening outwardly the inner portion of the section of the led to make it tend towards the circle of radius r 'on the outer face of the saddle 5. Another variant consists in placing, on either side of the central portion of constant section of the duct 10, a cross-sectional flare circular, trumpet-shaped, whose smallest diameter is equal to r '. In this way, the flaring can simply be achieved by a guide piece formed by machining and placed at the mouth of the duct 10. The central portion of the ducts 10 may be made by molding in the material 7, for example a filling mortar, constituting the matrix of the seat 5. It then has in the bent tube 6 negative molds having the shape of the ducts 10. Their positions and their transverse spacings are maintained by guides regularly spaced in the tube 6. The tube 6 is then filled with a hardenable material such as a high-strength mortar. The formwork can be made either by mechanical destruction of the molds, or by dissolution or shrinkage. This embodiment of the saddle by molding can be performed in the factory. On site, the saddle thus produced is hoisted on the pylon and put in place at the prescribed position. Once the pylon is completed, the strands 4 of the stay are hoisted, slipped into the saddle 5 and then anchored on the deck 1.

[0029] Un avantage de la selle 5 décrite ci-dessus est qu'elle est compatible avec l'emploi de brins 4 constitués par des torons individuellement gainés. La section d'un tel brin 4 est montrée sur les figures 5 et 6, où la référence 16 désigne les fils métalliques torsadés du toron, et la référence 17 désigne la gaine en matière plastique qui entoure ces fils. Les fils 16 sont typiquement en acier galvanisé tandis que la gaine 17 est en polyéthylène à haute densité (PEHD). Un matériau de remplissage souple comble les interstices entre les fils métalliques 16 et ceux entre les fils 16 et la gaine 17. An advantage of the saddle 5 described above is that it is compatible with the use of strands 4 constituted by individually wrapped strands. The section of such a strand 4 is shown in Figures 5 and 6, where the reference 16 designates the twisted metal son of the strand, and the reference 17 designates the plastic sheath that surrounds these son. The wires 16 are typically made of galvanized steel while the sheath 17 is made of high density polyethylene (HDPE). A flexible filling material fills the interstices between the wires 16 and those between the wires 16 and the sheath 17.

[0030] Le toron gainé 4 représenté sur les figures 5 et 6 a une section extérieure circulaire. La zone de support 1 1 des conduits 10 est alors dimensionnée pour avoir le même rayon r que celui du toron gainé 4. Dans la pratique, il peut y avoir une légère différence de rayon entre la zone de support 1 1 et la section extérieure du brin 4, dans la mesure où le fluage de la matière plastique de la gaine 17 pressée contre la paroi du conduit reste acceptable. De même, il se peut que la section extérieure du brin 4 ne soit pas exactement circulaire mais, par exemple, hexagonale à coins arrondis par suite de l'extrusion de la gaine 17 sur le toron métallique. Dans ce cas, le "diamètre extérieur du brin" doit s'entendre comme étant le diamètre du plus petit cercle dans lequel s'inscrit la section transversale du brin. Cette définition du "diamètre extérieur du brin" vaut également dans le cas d'un toron métallique non gainé. Bien que non préféré, ce dernier cas peut s'inscrire dans le cadre de l'invention, les contacts entre le brin tendu et la zone de support 1 1 de son conduit étant alors suivant des lignes en spirale plutôt que ponctuels. The sheathed strand 4 shown in Figures 5 and 6 has a circular outer section. The support zone 1 1 of the ducts 10 is then dimensioned to have the same radius r as that of the sheathed strand 4. In practice, there may be a slight difference in radius between the support zone 1 1 and the outer section of the strand 4, insofar as the creep of the plastic material of the sheath 17 pressed against the wall of the conduit remains acceptable. Similarly, it may be that the outer section of the strand 4 is not exactly circular but, for example, hexagonal rounded corners due to the extrusion of the sheath 17 on the metal strand. In this case, the "outer diameter of the strand" should be understood as the diameter of the smallest circle in which the cross-section of the strand is inscribed. This definition of "outer diameter of the strand" also applies in the case of a metallic strand unsheathed. Although not preferred, the latter case may fall within the scope of the invention, the contacts between the stretched strand and the support zone January 1 of its conduit then being in spiral lines rather than punctual.

[0031] Les modes de réalisation mentionnés ci-dessus sont des illustrations de la présente invention. Diverses modifications peuvent leur être apportées sans sortir du cadre de l'invention qui ressort des revendications annexées. En particulier, le dispositif de déviation selon l'invention peut être mis en œuvre pour dévier des câbles de structure autres que des haubans. The embodiments mentioned above are illustrations of the present invention. Various modifications can be made without departing from the scope of the invention which emerges from the appended claims. In particular, the deflection device according to the invention can be implemented to deflect structural cables other than shrouds.

Claims

R E V E N D I C A T I O N S 1 . Dispositif de déviation d'un câble de structure (3) comportant plusieurs brins tendus (4), le dispositif comprenant un corps (7) traversé de conduits (10), dans lequel chaque conduit a une paroi pour guider un des brins selon un trajet courbe (T), la paroi du conduit comportant une zone de support du brin (1 1 ) dirigée vers l'intérieur de la courbure du trajet, laquelle zone de support présente, au moins dans une partie centrale du conduit et transversalement au trajet courbe, une section en forme d'arc de cercle de rayon (r) sensiblement égal à la moitié du diamètre extérieur du brin, la partie centrale du conduit ayant une section transversale élargie en dehors de la zone de support. 1. Device for deflecting a structural cable (3) comprising a plurality of tensioned strands (4), the device comprising a body (7) traversed by conduits (10), in which each conduit has a wall for guiding one of the strands along a path curve (T), the duct wall having a support zone of the strand (11) directed inwardly of the curvature of the path, which support zone has, at least in a central portion of the duct and transversely to the curved path , an arc-shaped section of radius (r) substantially equal to half the outer diameter of the strand, the central portion of the conduit having an enlarged cross section outside the support zone. 2. Dispositif selon la revendication 1 , dans lequel la forme en arc de cercle de la section de la zone de support (1 1 ) s'étend sur un secteur angulaire (a) d'au moins 60°, de préférence compris entre 90° et 120°. 2. Device according to claim 1, wherein the arcuate shape of the section of the support zone (1 1) extends over an angular sector (a) of at least 60 °, preferably between 90 ° and 120 °. 3. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la partie centrale du conduit (10) présente, en dehors de la zone de support (1 1 ), une section transversale en forme de voûte (12) de diamètre supérieur au diamètre extérieur du brin (4). 3. Device according to any one of the preceding claims, wherein the central portion of the duct (10) has, outside the support zone (1 1), a vault-shaped cross section (12) of diameter greater than outer diameter of the strand (4). 4. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la section transversale du conduit (10) est suffisante pour contenir un cercle (C) de diamètre supérieur d'au moins 2 millimètres au diamètre extérieur du brin (4). 4. Device according to any one of the preceding claims, wherein the cross section of the duct (10) is sufficient to contain a circle (C) of diameter greater than at least 2 millimeters to the outer diameter of the strand (4). 5. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la section transversale du conduit (10) s'évase vers l'extérieur sur au moins un côté de sa partie centrale. 5. Device according to any one of the preceding claims, wherein the cross section of the duct (10) flares outwardly on at least one side of its central portion. 6. Dispositif selon la revendication 5, dans lequel l'évasement de la section transversale du conduit (10) vers l'extérieur suit, sur le côté intérieur de la courbure du trajet (T), une ligne génératrice sensiblement circulaire de rayon (R') inférieur au rayon de courbure (R) du trajet dans la partie centrale du conduit. 6. Device according to claim 5, wherein the flaring of the cross section of the duct (10) outwardly follows, on the inner side of the curvature of the path (T), a substantially circular generating line of radius (R ') less than the radius of curvature (R) of the path in the central part of the conduit. 7. Dispositif selon l'une quelconque des revendications précédentes, comprenant en outre un tube courbe (6) pour recevoir le câble de structure (3), le corps (7) pourvu des conduits (10) étant logé à l'intérieur du tube courbe. 7. Device according to any one of the preceding claims, further comprising a curved tube (6) for receiving the structural cable (3), the body (7) provided with the ducts (10) being housed inside the tube curve. 8. Ouvrage de construction, comprenant au moins un câble de structure (3) comportant plusieurs brins tendus (4), des ancrages (8) des brins aux extrémités du câble, et au moins un dispositif de déviation du câble entre les ancrages, le dispositif de déviation (5) comprenant un corps (7) traversé de conduits (10), dans lequel chaque conduit a une paroi pour guider un des brins selon un trajet courbe (T), la paroi du conduit comportant une zone de support (1 1 ) du brin dirigée vers l'intérieur de la courbure du trajet, laquelle zone de support présente, au moins dans une partie centrale du conduit et transversalement au trajet courbe, une section en forme d'arc de cercle de rayon (r) sensiblement égal à la moitié du diamètre extérieur du brin, la partie centrale du conduit ayant une section transversale élargie en dehors de la zone de support. 8. Construction structure, comprising at least one structural cable (3) comprising a plurality of tensioned strands (4), anchors (8) of the strands at the ends of the cable, and at least one device for deflecting the cable between the anchors, the deflection device (5) comprising a body (7) traversed by conduits (10), wherein each duct has a wall for guiding one of the strands along a curved path (T), the duct wall having a support zone (1 1) of the inwardly directed strand of the curvature of the path, which support zone has, at least in a central portion of the conduit and transversely to the curved path, a circular arc-shaped section of radius (r) substantially equal to half the outer diameter of the strand, the central portion of the duct having an enlarged cross section outside the support zone. 9. Ouvrage de construction selon la revendication 8, dans lequel la forme en arc de cercle de la section de la zone de support (1 1 ) s'étend sur un secteur angulaire (a) d'au moins 60°, de préférence compris entre 90° et 120°. 9. Building construction according to claim 8, wherein the arcuate shape of the section of the support zone (1 1) extends over an angular sector (a) of at least 60 °, preferably included between 90 ° and 120 °. 10. Ouvrage de construction selon l'une quelconque des revendications 8 et 9, dans lequel la partie centrale du conduit (10) présente, en dehors de la zone de support (1 1 ), une section transversale en forme de voûte (12) de diamètre supérieur au diamètre extérieur du brin. 10. Construction structure according to any one of claims 8 and 9, wherein the central portion of the duct (10) has, outside the support zone (1 1), a cross-section in the form of a vault (12). greater in diameter than the outer diameter of the strand. 1 1 . Ouvrage de construction selon l'une quelconque des revendications1 1. Construction structure according to one of the claims 8 à 10, dans lequel la section transversale du conduit (10) est suffisante pour contenir un cercle (C) de diamètre supérieur d'au moins 2 mm au diamètre extérieur du brin (4). 8 to 10, wherein the cross section of the conduit (10) is sufficient to contain a circle (C) of diameter at least 2 mm larger than the outer diameter of the strand (4). 12. Ouvrage de construction selon l'une quelconque des revendications 8 à 1 1 , dans lequel la section transversale du conduit (10) s'évase vers l'extérieur sur au moins un côté de sa partie centrale. 12. Construction structure according to any one of claims 8 to 11, wherein the cross section of the duct (10) flares outwardly on at least one side of its central portion. 13. Ouvrage de construction selon la revendication 12, dans lequel l'évasement de la section transversale du conduit (10) vers l'extérieur suit, sur le côté intérieur de la courbure du trajet (T), une ligne génératrice sensiblement circulaire de rayon (R') inférieur au rayon de courbure (R) du trajet dans la partie centrale du conduit. 13. Building construction according to claim 12, wherein the flaring of the cross section of the duct (10) outward follows, on the inside of the curvature of the path (T), a substantially circular generatrix line of radius (R ') less than the radius of curvature (R) of the path in the central part of the duct. 14. Ouvrage de construction selon l'une quelconque des revendications 8 à 13, dans lequel les brins (4) comportent chacun un toron métallique (16) et une gaine (17) en matière plastique entourant le toron, la gaine étant appliquée contre la zone de support (1 1 ) de la paroi du conduit (10). 14. Construction structure according to any one of claims 8 to 13, wherein the strands (4) each comprise a metal strand (16) and a sheath (17) of plastic material surrounding the strand, the sheath being applied against the support zone (1 1) of the duct wall (10). 15. Ouvrage de construction selon l'une quelconque des revendications15. Construction work according to any one of the claims 8 à 14, sous la forme un pont à haubans, le dispositif de déviation (5) étant installé sur un pylône (2) du pont et les ancrages (8) étant installés sur un tablier (1 ) du pont. 8 to 14, in the form of a cable-stayed bridge, the deflection device (5) being installed on a pylon (2) of the bridge and the anchors (8) being installed on an apron (1) of the bridge. 16. Ouvrage de construction selon l'une quelconque des revendications 8 à 15, dans lequel le dispositif de déviation du câble comprend en outre un tube courbe (6) pour recevoir le câble de structure (3), le corps (7) pourvu des conduits (10) étant logé à l'intérieur du tube courbe. Construction structure according to any one of claims 8 to 15, wherein the cable deflection device further comprises a curved tube (6) for receiving the structural cable (3), the body (7) provided with conduits (10) being housed inside the curved tube.
EP11811045.1A 2010-12-08 2011-12-07 Device for diverting a structural cable, such as a guy line, and construction comprising same Active EP2649239B1 (en)

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FR1060270A FR2968681B1 (en) 2010-12-08 2010-12-08 DEVICE FOR THE DEVIATION OF A STRUCTURED CABLE, SUCH AS A HAUBAN, AND A WORK THUS EQUIPPED
PCT/FR2011/052897 WO2012076815A2 (en) 2010-12-08 2011-12-07 Device for diverting a structural cable, such as a guy line, and construction comprising same

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KR20130123415A (en) 2013-11-12
MX357990B (en) 2018-07-31
CA2820024A1 (en) 2012-06-14
RU2594246C2 (en) 2016-08-10
CA2820024C (en) 2018-12-11
EP2649239B1 (en) 2017-02-08
PL2649239T3 (en) 2017-08-31
HUE032808T2 (en) 2017-11-28
WO2012076815A3 (en) 2012-08-09
US20130255170A1 (en) 2013-10-03
JP2013544997A (en) 2013-12-19
MX2013006537A (en) 2013-08-01
KR101928970B1 (en) 2018-12-13
FR2968681A1 (en) 2012-06-15
US8959692B2 (en) 2015-02-24
RU2013131103A (en) 2015-01-20
CN103476993B (en) 2016-04-06
FR2968681B1 (en) 2015-05-29
CN103476993A (en) 2013-12-25
WO2012076815A2 (en) 2012-06-14
PT2649239T (en) 2017-05-19
ES2624267T3 (en) 2017-07-13
HK1190764A1 (en) 2014-07-11
DK2649239T3 (en) 2017-05-15
JP6177134B2 (en) 2017-08-09

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