EP1512794B1 - Vorrichtung zur Schwingungsdämpfung von Seilen und dazugehöriges Verfahren - Google Patents

Vorrichtung zur Schwingungsdämpfung von Seilen und dazugehöriges Verfahren Download PDF

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Publication number
EP1512794B1
EP1512794B1 EP04292022A EP04292022A EP1512794B1 EP 1512794 B1 EP1512794 B1 EP 1512794B1 EP 04292022 A EP04292022 A EP 04292022A EP 04292022 A EP04292022 A EP 04292022A EP 1512794 B1 EP1512794 B1 EP 1512794B1
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EP
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Prior art keywords
piston
cable
tube
dampers
type dampers
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EP04292022A
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English (en)
French (fr)
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EP1512794A1 (de
Inventor
Jean-Pierre Messein
Benoît Lecinq
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Freyssinet SAS
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Freyssinet SAS
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D11/00—Suspension or cable-stayed bridges
    • 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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D11/00—Suspension or cable-stayed bridges
    • E01D11/04—Cable-stayed bridges

Definitions

  • the present invention relates to devices for damping the vibrations of a cable involved in the structure of a construction structure, including a stay.
  • the invention applies in particular to guyed bridges.
  • the stays are then anchored at their ends, for example on a pylon and on the deck of the bridge. They thus ensure the maintenance and stability of the structure.
  • the stays Under certain conditions, especially when subjected to periodic excitations, the stays can accumulate energy and oscillate significantly.
  • the two main causes of these vibrations are the displacement of the anchors under the effect of traffic loads or wind, and the effect of the wind acting directly on the cables. These oscillations can cause users' anxiety. In addition, if they are not controlled, they may damage the guys.
  • External dampers generally use piston dampers, similar in size to those used for trucks or trains. These dampers are able to absorb energy during the relative displacement of their ends. One of these ends is fixed on the cable, either directly by means of a collar, or by means of a pendulum itself hinged on a collar fixed on the cable. The other end of the damper is fixed on a frame rigidly connected to the structure, usually the deck of the guyed bridge.
  • the internal dampers are placed around the stay cable. They are generally located in the extension of the tubes surrounding the bundle of metal strands composing the cable and rigidly connected to the structure (anchoring tubes for example). They act on the relative displacements between the bundle of strands of the cable and the anchoring tube surrounding the bundle of strands, in case of vibration of the cable.
  • JP-A-06 058370 discloses an absorber with the features of the preamble of claim 1.
  • An object of the present invention is to limit the disadvantages of existing dampers, as recalled above.
  • the invention thus proposes a device for damping the vibrations of a cable participating in the structure of a construction structure according to claim 1.
  • the damping device relies on the structure only through the tube, which avoids the disadvantages associated with external dampers, mentioned above.
  • the invention further provides a method of damping vibration of a cable, wherein vibration damping is achieved by the device having the characteristics mentioned above.
  • Figure 1 shows a stay including a bundle of metal strands 5, surrounded in its current part (left in Figure 1) of a sheath 6, typically plastic.
  • the cable also extends to the right of the figure, towards an anchoring zone.
  • the cable is connected to an anchoring tube 4 which is fixed rigidly to the cable-stayed structure, for example in the deck or in a pylon of a cable-stayed bridge.
  • a clamp 3 is provided around the metal strands 5 in order to effectively compact the bundle on a portion thereof.
  • This collar is preferably located near the anchoring zone, while being far enough to improve the damping. It can have various forms. According to one apparent embodiment in Figures 3 and 4, it has a hexagonal inner surface in contact with the bundle of strands, so as to clamp the bundle of strands with a minimum clearance, and is composed of two distinct parts, which can be separated when it is desired to release the bundle of metal strands.
  • Hydraulic piston dampers 1 the pistons having a linear stroke, are also positioned radially around the beam 5. They are connected, by one of their ends, to the cable via the clamping collar 3 (such a damper to piston 1 is shown in Figure 1).
  • the piston dampers 1 are also indirectly connected to the structure, via a support, for example a shell 2 placed around the bundle of strands 5 and the clamp 3, while leaving a free space between its inner surface and the bundle of strands.
  • the shell 2 may have a circular cross section of the same diameter as the sheath 6 at the end of which it is connected (left end of the shell in Figure 1).
  • the connection between the shell 2 and the structure of the structure is via the anchoring tube 4, to which the shell is connected at one of its ends (right end in Figure 1).
  • the anchoring tube 4 advantageously has a circular cross section of diameter close to that of the anchoring tube 4. This avoids the aesthetic disadvantages posed by the external dampers. It also benefits from effective damping by the use of hydraulic dampers, whose law damping can be for example linear, quadratic, or other.
  • the pistons can absorb energy during relative movements of the bundle of strands 5 relative to the structure, so as to dampen these displacements.
  • the connections between the piston dampers 1 and the clamp 3 on the one hand, and the shell 2 on the other hand must offer degrees of freedom capable of attenuating certain displacements of the bundle of strands 5.
  • the connection 7 between the piston dampers 1 and the shell 2, and the connection 8 between the piston dampers 1 and the clamp 3 are advantageously ball joints. We then have a rod operation of each piston damper.
  • FIGS. 6 and 7 are kinematic diagrams of this embodiment of the invention, in which the pivot connection 7 between each piston damper 1 and the shell 2 is clearly distinguished, and the ball joint 8 between each damper piston 1 and the bundle of metal strands 5 (via the clamp 3).
  • piston dampers 1 In order to damp the vibrations of the cable in the maximum possible directions, it is necessary to position at least two piston dampers 1 radially around the cable. If only two piston dampers are used, they shall preferably be placed perpendicular to each other, so as to damp the vibrations in all directions, each direction being then decomposed into two perpendicular components according to the directions of the two dampers. piston used.
  • a higher number of piston dampers 1 can be used, for reasons of robustness.
  • a piston damper when a piston damper is defective, it can be supplemented by the projected component of one or more other piston dampers.
  • the number of piston dampers will not be multiplied unduly, for economic reasons and congestion.
  • An advantageous embodiment consists in using three piston dampers placed around the cable at an angle of 120 ° between them. This embodiment is illustrated in FIG. 5 (where the piston dampers have not been shown, but where the connections 7 between the various piston dampers and the shell 2 are apparent).
  • the linear stroke of the pistons results from the amplitude of the vibrations of the cable.
  • the size of the piston dampers must therefore be chosen with respect to this amplitude and the damping law. It is considered, by way of illustration, that the length of a piston damper is at least three times the stroke performed. Thus, for strokes of +/- 50 mm, ie a total of 100 mm, the length of the piston is at least 300 mm.
  • openings 9 are provided in the shell 2, to allow access to the connection 8 and the passage through the piston dampers, while allowing the movement of the piston dampers in accordance with links 7 and 8. These openings may for example be oblong holes and they must provide sufficient clearance not to impede the movement of the piston dampers, when cable vibrations appear, but also to be able to ensure the maintenance of internal organs.
  • sealing means are advantageously provided .
  • sealed covers 12 may completely cover the damping devices around each of the piston dampers 1 used, as illustrated in FIG. 1, which has the effect of sealing the openings 9.
  • Another sealing system may also be used: it consists of a flexible skirt, sealingly connected to a piston damper 1 on the one hand, and to the shell 2 on the other hand.
  • all mechanical connections are preferably sealed.
  • the shell 2 is preferably aligned with the anchoring tube 4 and extended by the waterproof sheath 6 protecting the bundle metal strands 5 in the current portion.
  • the dampers and links deteriorate over time, which requires maintenance or even periodic replacement.
  • the piston dampers 1 are advantageously connected to the shell 2 and the clamp 3, without it being necessary to open the shell.
  • FIG. 1 provides an illustration of such a connection between a piston damper 1 and the clamp 3.
  • the end of the piston damper then consists of a threaded rod which can be screwed into a tapped cradle 10. complementary way, this cradle itself being connected to the ball joint 8 which connects the collar 3 to the piston damper 1.
  • the external thread of the piston damper 1 makes it possible to adjust the position of the piston damper as a function of the level of centering of the bundle of metallic strands 5 inside the tube 4 or the shell 2.
  • An anti-unscrewing system of the piston damper 1 on the cradle 10 will advantageously be used, to prevent the vibrations of the assembly from causing the unscrewing of the piston damper.
  • FIG. 2 shows an alternative connection between a piston damper 1 and the clamp 3.
  • the piston damper 1 comprises in fact at its end a rod provided with a male clevis 15.
  • One or more female clevises 16 are also connected rigidly to the clamp 3.
  • the connection between the piston damper 1 and the clamp 3 then consists in actuating in translation, from the outside of the shell 2, a pin 17 parallel to the cable, by the intermediate control means 18, operating for example in the manner of a bicycle brake cable.
  • this means 18 is actuated, the pin 17 is placed in or out of the orifices of the yokes 15 and 16, thus ensuring the releasable connection between the piston damper 1 and the collar 3.
  • the amplitude of vibration of the stay is not predictable with certainty, it may be interesting to limit the amplitude of displacement of the clamp 3 by mechanical means independent of piston dampers 1, so as to avoid unnecessarily oversize the stroke of the pistons, but also to protect them from overload. In addition, it is useful to be able to adapt the position of the damper in the case where the cable is not perfectly centered in the anchor tube, particularly because of the tolerances of execution of the structure.
  • adjustable running limiters may be arranged on the clamping collar 3.
  • FIG. 1 shows an example of such an element 11.
  • six screws 11 are arranged on the six outer faces of the hexagonal collar. 3 to limit the stroke of the bundle of strands 5.
  • These screws can be screwed or unscrewed into parts, such as nuts, welded to the faces of the clamp 3. They are advantageously terminated by a head provided with a shock absorbing material, such as rubber for example. They are positioned at a distance from the shell 2 corresponding to the maximum desired stroke for the bundle of strands 5.
  • FIG. 3 shows, in cross section, a damper according to the invention, where a single piston damper 1 has been shown for ease of reading.
  • the bundle of metal strands 5 is centered inside the shell 2 which is in alignment with the anchoring tube 4 and the sheath 6 of the cable.
  • the piston damper is in radial position relative to the cable. This position corresponds to a rest position, in which no vibration has occurred and therefore in which the damper has to attenuate no relative displacement of the bundle of strands 5 with respect to the shell 2, that is to say say in relation to the structure with which the shell is secured.
  • FIG. 4 shows the same device as in FIG. 3.
  • the bundle of metal strands 5 has been displaced relative to the shell due to cable vibrations. .
  • the bundle of strands 5 thus moves until the collar 3 arrives, at the most, in contact with the shell 2 (or until a stroke limiter 11 comes into contact with the shell).
  • the movement of the bundle of strands 5 is attenuated by the action of the piston damper 1, which moves by means of its ball joint 8 with the clamp 3 and its pivot connection 7 with the shell 2.
  • the displacement of the piston damper 1 is such that the latter is in a position away from an angle ⁇ of its radial position of rest.
  • each piston damper undergoes a clean displacement in accordance with the connections it has with the clamp 3 and the shell 2.
  • Each displacement of the bundle of strands 5 then results in a simultaneous action of each piston damper, in directions corresponding to respective components of the general direction of displacement of the bundle 5.
  • FIG. 5 shows an advantageous embodiment of the invention, in which three piston dampers (not shown) are connected to the shell 2, in a regular manner, so that their respective axes form, two by two, a angle of 120 °.
  • the shell 2 of Figure 5 is composed of two distinct parts 2a and 2b, the two shell portions being interconnected for example by means of screws.
  • Such a shell has the advantage of being easily attached around the bundle of strands 5, and to be easily removable.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Fluid-Damping Devices (AREA)
  • Vibration Prevention Devices (AREA)
  • Control And Safety Of Cranes (AREA)

Claims (18)

  1. Vorrichtung zur Dämpfung der Schwingungen eines Seils, das Teil der Struktur eines Bauwerks ist, wobei das Seil aus einem Bündel von metallenen Fasern (5) besteht, deren Enden an dem Bauwerk verankert sind, und in mindestens einem Bereich, der an ein verankertes Ende des Faserbündels angrenzt, von einem mit dem Bauwerk verbundenen Rohr (4) umgeben ist, wobei die Vorrichtung eine Schelle (3), die um das Faserbündel herum angeordnet ist, und Mittel zur Absorption von Schwingungsenergie, die im Wesentlichen zwischen der Schelle und dem Rohr angebracht sind, umfasst,
    dadurch gekennzeichnet,
    dass die Absorptionsmittel mindestens zwei Kolben-Schwingungsdämpfer (1) mit im Wesentlichen linearem Hub umfassen, die im Winkel um das Seil verteilt angeordnet sind, wobei jeder Kolben-Schwingungsdämpfer eine erste Gelenkverbindung (8) mit der Schelle und eine zweite Gelenkverbindung (7) mit einem fest mit dem Rohr verbundenen Tragelement (2) aufweist, und dass die Arbeitsachsen dieser Kolben-Schwingungsdämpfer im Wesentlichen in radialer Richtung zum Seil verlaufen.
  2. Vorrichtung nach Anspruch 1, bei der dieses fest mit dem Rohr (4) verbundene Tragelement (2) im Wesentlichen in der Verlängerung des Rohrs angeordnet ist oder Teil dieses Rohrs ist.
  3. Vorrichtung nach Anspruch 1 oder 2, bei der dieses fest mit dem Rohr (4) verbundene Tragelement (2) im Wesentlichen in der Verlängerung eines Mantels angeordnet ist, der das Bündel von metallenen Fasern (5) an einem laufenden Teil des Seils umgibt.
  4. Vorrichtung nach einem der vorherigen Ansprüche, bei der das fest mit dem Rohr (4) verbundene Tragelement (2) mindestens zwei Abschnitte aufweist, die um das Bündel von metallenen Fasern (5) herum aneinander befestigt oder voneinander getrennt werden können.
  5. Vorrichtung nach einem der vorherigen Ansprüche, bei der die Absorptionsmittel zwei Kolben-Schwingungsdämpfer (1) umfassen, die im Wesentlichen im rechten Winkel zueinander angeordnet sind.
  6. Vorrichtung nach einem der Ansprüche 1 bis 4, bei der die Absorptionsmittel mindestens drei Kolben-Schwingungsdämpfer (1) umfassen, die in regelmäßigen Abständen im Winkel zueinander um das Seil herum angeordnet sind.
  7. Vorrichtung nach einem der vorherigen Ansprüche, bei der die genannte erste Verbindung (8) zumindest für bestimmte Kolben-Schwingungsdämpfer (1) eine Kugelgelenkverbindung ist.
  8. Vorrichtung nach einem der vorherigen Ansprüche, bei der die genannte zweite Verbindung (7) zumindest für bestimmte Kolben-Schwingungsdämpfer (1) eine Kugelgelenkverbindung ist.
  9. Vorrichtung nach einem der vorherigen Ansprüche, bei der die genannte zweite Verbindung (7) zumindest für bestimmte Kolben-Schwingungsdämpfer (1) eine parallel zum Seil bestehende Drehzapfenverbindung ist.
  10. Vorrichtung nach einem der vorherigen Ansprüche, bei der sich zumindest bestimmte Kolben-Schwingungsdämpfer (1) teilweise über das fest mit dem Rohr (4) verbundene Tragelement (2) hinaus erstrecken, und bei der in dem Tragelement jeweilige Öffnungen (9) vorgesehen sind, um Zugang zu der ersten Gelenkverbindung (8) zwischen den genannten Kolben-Schwingungsdampfem und der Schelle (3) zu schaffen.
  11. Vorrichtung nach Anspruch 10, die Dichtungsmittel (12) aufweist, um mindestens einen Zwischenraum zwischen diesen Kolben-Schwingsdämpfern (1) und den jeweiligen Öffnungen (9) in dem Tragelement dicht zu machen.
  12. Vorrichtung nach einem der vorherigen Ansprtiche, bei der die erste Gelenkverbindung (8) mit der Schelle (3) zumindest bei bestimmten Kolben-Schwingungsdämpfern (1) Mittel zum Verschrauben eines mit Gewinde versehenen Endes der Kolben-Schwingungsdämpfer in jeweiligen Wiegen (10) umfasst.
  13. Vorrichtung nach Anspruch 12, bei der die Verschraubmittel einstellbar sind, um die Stellung der Kolben-Schwingungsdämpfer (1) auf einen Zentrierungsgrad des Bündels von metallenen Fasern (5) in dem Rohr (4) einzustellen.
  14. Vorrichtung nach Anspruch 12 oder 13, bei der die erste Gelenkverbindung (8) mit der Schelle (3) bei diesen Kolben-Schwingungsdämpfern (1) ferner Arretiermittel umfasst, die geeignet sind, ein Lösen des mit Gewinde versehenen Endes der Kolben-Schwingungsdämpfer aus den jeweiligen Wiegen (10) zu verhindern.
  15. Vorrichtung nach einem der vorherigen Ansprüche, bei der ein Ende wenigstens einiger Kolben-Schwingungsdämpfer (1) mit einer Gabelgelenkstange (15) versehen ist, bei der mindestens eine entsprechende Gelenkgabel (16) an der Schelle (3) befestigt ist, und bei der die erste Gelenkverbindung (8) mit der Schelle (3) für diese Kolben-Schwingungsdämpfer (1) Mittel zum Einführen eines Stifts (17) in die Gabelgelenkstange des Kolbens und in die entsprechende Gelenkgabel umfasst, wobei diese Mittel zum Einführen eines Stifts von außerhalb des Rohrs (4) zu betätigen sind.
  16. Vorrichtung nach einem der vorherigen Ansprüche, die ferner Mittel (11) aufweist, um den Hub der Kolben regelbar zu begrenzen.
  17. Vorrichtung nach Anspruch 16, bei der die Mittel (11) zum Begrenzen des Hubs der Kolben Schrauben umfassen, die geeignet sind, in Teile eingeschraubt oder ausgeschraubt zu werden, die auf einer Oberfläche der Schelle aufgeschweißt und verteilt angeordnet sind, wobei die Schrauben außerdem einen Kopf aufweisen, der mit einem stoßabsorbierenden Material beschichtet ist.
  18. Verfahren zum Dämpfen von Schwingungen eines Seils, bei dem das Dämpfen der Schwingungen durch eine Vorrichtung nach einem der vorherigen Ansprüche erfolgt.
EP04292022A 2003-09-03 2004-08-10 Vorrichtung zur Schwingungsdämpfung von Seilen und dazugehöriges Verfahren Active EP1512794B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0310420A FR2859260B1 (fr) 2003-09-03 2003-09-03 Dispositif pour amortir les vibrations d'un cable et procede d'amortissement associe
FR0310420 2003-09-03

Publications (2)

Publication Number Publication Date
EP1512794A1 EP1512794A1 (de) 2005-03-09
EP1512794B1 true EP1512794B1 (de) 2006-05-31

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US (1) US7422190B2 (de)
EP (1) EP1512794B1 (de)
JP (1) JP4527427B2 (de)
KR (1) KR101273641B1 (de)
CN (1) CN100359204C (de)
AT (1) ATE328159T1 (de)
DE (1) DE602004001029T2 (de)
ES (1) ES2265626T3 (de)
FR (1) FR2859260B1 (de)
HK (1) HK1071779A1 (de)

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CN104612052B (zh) * 2015-02-04 2016-03-30 河南省交通规划设计研究院股份有限公司 用于桥梁拱肋吊杆的锚固装置
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Publication number Priority date Publication date Assignee Title
WO2021239221A1 (en) 2020-05-27 2021-12-02 Dywidag-Systems International Gmbh Damping arrangement for a cable

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KR101273641B1 (ko) 2013-06-11
JP2005076447A (ja) 2005-03-24
JP4527427B2 (ja) 2010-08-18
FR2859260A1 (fr) 2005-03-04
KR20050024605A (ko) 2005-03-10
US7422190B2 (en) 2008-09-09
DE602004001029T2 (de) 2007-01-04
CN1590649A (zh) 2005-03-09
US20050072895A1 (en) 2005-04-07
FR2859260B1 (fr) 2006-02-24
EP1512794A1 (de) 2005-03-09
DE602004001029D1 (de) 2006-07-06
HK1071779A1 (en) 2005-07-29
ES2265626T3 (es) 2007-02-16
ATE328159T1 (de) 2006-06-15
CN100359204C (zh) 2008-01-02

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