EP1505223B1 - Tendon protégé contre la corrosion, en particulier pour béton précontraint - Google Patents

Tendon protégé contre la corrosion, en particulier pour béton précontraint Download PDF

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Publication number
EP1505223B1
EP1505223B1 EP04017158A EP04017158A EP1505223B1 EP 1505223 B1 EP1505223 B1 EP 1505223B1 EP 04017158 A EP04017158 A EP 04017158A EP 04017158 A EP04017158 A EP 04017158A EP 1505223 B1 EP1505223 B1 EP 1505223B1
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EP
European Patent Office
Prior art keywords
plate
tension member
pressure
member according
tension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP04017158A
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German (de)
English (en)
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EP1505223A1 (fr
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Dywidag Systems International GmbH
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Dywidag Systems International GmbH
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Publication of EP1505223A1 publication Critical patent/EP1505223A1/fr
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 invention relates to a corrosion-protected tension member, in particular a tendon for prestressed concrete, according to the preamble of patent claim 1.
  • the prestressing is known with and without composite.
  • the tendons are longitudinally movable within the concrete section and are brought after clamping against the hardened concrete by injecting cement paste in conjunction with the surrounding concrete.
  • the tendons are usually outside the concrete section, but are supported against the building; they can be viewed, re-tensioned and possibly replaced at any time.
  • tension elements of this type so-called “monostrands” are often used as tension elements, that is strands of seven steel wires, which are coated to protect against corrosion in each case by an applied by extrusion coat of plastic, for example polyethylene, and of a gusset between the steel wires and the annular space between the strand and sheath filling anticorrosion compound, for example, fat are surrounded; Strands are also known which are surrounded for increased protection against corrosion of two such jackets.
  • the anchorages of the strands at the ends of the tendons are usually made of steel anchor plates with conical, then cylindrical holes in the number of strands through which they are inserted and in which they are anchored by means of multi-part ring wedges.
  • the cavities in the anchoring areas, in which the sheaths of the strands have been removed, must be filled with a material, for example grease, which ensures protection against corrosion there.
  • a material for example grease
  • the voids between the individual strands in the areas of the tendons between the anchors at the ends are filled with a hardening material, such as cement mortar, for corrosion protection, it is necessary to delimit the anchoring areas to be filled with anticorrosive material close to these areas.
  • sealing elements of elastic material penetrated by the individual strands with their sheaths which are brought to a transverse extent by surface pressure exerted in the axial direction of the tensioning member in order to resist tightly complete the individual strands and against the inner wall of the outer sheath.
  • Such, designed in the manner of a stuffing box seals are known for example from EP 0 323 285 B2 and WO 01/20098 A1.
  • a pressure is exerted on the enclosed between pressure plates sealing elements to activate the seal by from the air side of the armature disc to be actuated screws. This type of activation of the seal requires a lot of effort.
  • WO 01/20098 A1 discloses a tension member according to the preamble of claim 1.
  • Non-composite tendons which have heretofore been used essentially as external tendons, that is, out of the concrete cross-section, are also increasingly being used as internal tendons, that is tendons within the concrete section.
  • internal tendons As arranged within the concrete section tendons have advantages in static terms, namely in terms of exploitable lever arm of the internal forces; In addition, the clamping force can be controlled by retightening, which is not possible with bias with composite.
  • the ability to exchange individual tension elements or the entire bundle can.
  • a particular advantage over external tendons is that the tendons are embedded in the concrete, so that the deflecting forces arising at deflection points can be absorbed without special measures.
  • often also strands with reinforced sheath or double extruded strands are used.
  • the present invention seeks to provide a simpler and more economical way of sealing the anchoring region of a generic tension member, in particular for use as a tendon without composite, not only easy installation, but also easier replacement of individual strands and the possibility of using double extruded strands opens up.
  • the main advantage of the invention is to avoid the activation of the gland sealing of the anchoring area by additional operations such as from the air side of the anchor forth to be operated bolts or the like.
  • the seal is instead activated in a simple manner by holding the armature disk at a predetermined distance from the armature body during the assembly of the tension member by pressure-transmitting means, and that during the tensioning of the tension member longitudinal displacement of the armature disk in the direction of the armature body out through the pressure transmitting means of the required surface pressure is exerted on the turn against longitudinal displacement fixed sealing elements.
  • the perforated disk provided as a spacer for the individual tension elements serves as an abutment for the sealing disk, which can be made of soft rubber or foam, for example.
  • the perforated disc must be prevented by an abutment on the tubular part of the anchor body at a longitudinal displacement; This can be done by appropriate types of attacks on the inner wall of the anchor body.
  • a steel plate for generating a three-dimensional clamping state in the perforated disc are interposed.
  • FIG. 1 the anchoring region 1 of an inventively designed tension member 2 is shown in a longitudinal section.
  • the tension member 2 is in the illustrated case a tendon, which, as shown in FIG. 2 reveals, consists of fifteen individual tension elements 3.
  • the tension elements 3 in turn consist of so-called “monostrands", that is to say steel wire strands 4, which are surrounded for the purpose of corrosion protection of sheaths 5 made of plastic, in particular PE.
  • the spaces between the - not shown - individual wires of the strands 4 and the PE jacket 5 are filled with a corrosion protection material, such as grease.
  • the strands 4 are anchored in an anchor plate 6 made of steel by means of multi-part annular wedges 7.
  • the armature disk 6 is provided with bores which have an inner cylindrical portion, which merges into a conical region towards the air side (FIG. 1a).
  • the armature disk 6 is supported in the outer surface 8 of a structure via an intermediate ring 22 against a flange-like abutment ring 9 of a tubular anchor body 10, which is concreted into the building.
  • the anchor body 10 forms in the anchoring region 1, the tubular sheath of the bundle of tension elements 3, which then, if necessary, by means of a transition piece 11, in a further casing 18 can pass.
  • smooth or profiled PE pipes, metal pipes or the like can be used.
  • the transition piece 11 is made of plastic, usually made of PE; at the same time it serves as a soft deflection for the tension elements 3.
  • the invention extends above all to the connection of the corrosion protection of the tension elements 3 already applied during production to the anchorage, since the PE sheaths 5 of the tension elements 3 are removed in the actual anchorage region must, so that the wedges 7 can attack directly on the bare strands 4.
  • tension elements 3 While in the normal range of the tension member 2 between the anchorage areas 1 tightly packed tension elements 3 are spread outwards in the region of the transition piece 11 to bring them to the required in the anchor plate 6 for anchoring by the annular wedges 7 distance, they are on entry in the actual anchoring area by a perforated disc acting as a spacer 12 again deflected to the longitudinal axis of the tension member out.
  • the perforated disc 12 which consists of plastic and is provided with corresponding holes, is dimensioned so that the tension elements 3 are guided parallel to the axes of the wedges 7 and that they can absorb the resulting, radially directed towards the longitudinal axis deflecting forces.
  • the perforated disc 12 in turn serves as an abutment for a sealing disc 13 made of soft rubber or foam, which can be brought under surface pressure by means of a pressure plate 14a made of steel.
  • a pressure plate 14a made of steel.
  • the perforated disc 12 In order to apply such a pressure, the perforated disc 12 must be secured against longitudinal displacement. This is done in the example shown by a stop tube 15 which rests against the inner wall of the anchor body 10 and is secured thereto, for example by screws.
  • the protection against longitudinal displacement can also be done by forming a corresponding stop in the anchor body 10 made of cast steel on its inner wall.
  • a further steel plate 14b may be arranged on the side facing away from the armature disc 6 side of the perforated disc 12. This steel plate 14b at the same time supports the perforated disc 12 when receiving the deflecting forces.
  • a pressure tube 16 which surrounds the entire bundle of tension elements 3 within the anchor body 10 and is longitudinally displaceable with respect to this.
  • the length of this pressure tube 16 is dimensioned so that it protrudes beyond the outer surface of the abutment ring 9 by the degree of compression of the sealing washer 13 during assembly of the anchorage.
  • a retaining plate 17 arranged from steel. This retaining plate 17 has holes which allow just the passage of the bare strands 4, while the PE sheaths surrounding the strands 5 on the retaining plate 17 find a stop (Fig. 1a).
  • the retaining plate 17 In order not to hinder the subsequent backfilling of the cavities with corrosion protection material, the retaining plate 17 must be held by spacers in a certain, albeit small distance from the inside of the armature disk 6. Conveniently, the retaining plate 17 is provided with additional holes, so that the anticorrosive compound can penetrate into the holes of the armature disk 6 and into the slots between the parts of the ring wedges and there ensures proper corrosion protection of the strands 4.
  • the assembly of the anchoring formation according to the invention can be explained with reference to FIG. 3.
  • the anchor body 10 is connected to the casing 18 produced in the required length and installed in the formwork of the relevant concrete structure.
  • the tension elements 3, that is to say the strands 4 surrounded by PE sheaths 5, are drawn in or inserted in a manner known per se before or after the introduction of the concrete.
  • the individual strands 4 In order to ensure the desired interchangeability of the strands in the region of the gasket, the individual strands 4 must be surrounded in the region of the gasket 13 by tubes 23 which, while ensuring the seal to the outside, through which the strands can be pulled through.
  • tubes 23 on the retaining plate 17 an abutment (Fig. 1a).
  • the outer PE sheath When using double-extruded strands, that is, strands comprising two PE sheaths, the outer PE sheath must first be separated and removed at a certain distance from the tension-side strand end. Then, the inner PE jacket is so far away that it ends after clamping in the area to be filled with anticorrosion compound 19 of the anchorage. The previously peeled outer PE jacket is then pushed back, connected to the still existing outer jacket and cut to length so that it already binds during assembly in the area to be filled with anticorrosive compound 19.
  • the orifice plate 12 possibly previously the steel plate 14b, the sealing disc 13, the pressure plate 14a and the pressure tube 16 and the retaining plate 17 are first installed.
  • the assembly can be further simplified in that the pressure plate 14a and the pressure tube 16 to a cup-shaped mounting part to be united.
  • the anchor plate 6 is threaded onto the protruding strand ends.
  • This distance corresponds to the compressibility of the sealing washer 12, which is activated in this way when the armature disk 6 penetrates during clamping of the strands 4 by the appropriate distance in the anchor body 10 until they - with the interposition of the intermediate ring 22 - on the abutment ring. 9 supported.
  • the filling of the cavity 19 between the seal 13 and the armature disk 6 with anticorrosion compound is then carried out in a conventional manner after tensioning the tension elements 3 through holes in the armature disk 6, through which an injection lance can be introduced.
  • a cover 20 is placed on the abutment ring 9 of the anchor body 6 to protect by pressing in corrosion protection material 21 and the armature disk 6 with the wedge anchorages of the strands 4 against corrosion.
  • the clamping channel that is, the cavity between the tension elements 3 and the casing 18 is usually free to facilitate any replacement of individual strands or the entire bundle.
  • a non-hardening material such as bentonite or a low-strength hardening material such as cement mortar with plastic additive, for example Styrofoam
  • venting and injecting openings are provided on the anchor body 10 in a manner known per se. These openings can be used for drainage when filling channels are not filled.
  • intermediate ring 22 is used in the replacement of individual strands, including a release of the clamping force is required to avoid when re-tightening the strands a double wedge bite.
  • the intermediate ring 22, which is removed before re-tightening the strands, has a thickness corresponding to the distance to which the "new" wedge bite must be offset against the "old” wedge bite. In this case, to re-activate the seal by the sealing washer 12 a shortened by the thickness of the intermediate ring 22 anchor tube 16 is to be installed.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Piles And Underground Anchors (AREA)
  • Bridges Or Land Bridges (AREA)

Claims (13)

  1. Tirant d'ancrage (2) protégé contre la corrosion, en particulier élément de précontrainte pour béton précontraint, formé par une pluralité d'éléments de traction (3), tels que des tiges, fils ou torons d'acier, qui sont agencés à l'intérieur d'une gaine tubulaire (10) du tirant d'ancrage (2) et qui sont eux-mêmes entourés chacun par au moins une gaine (5) en matière plastique, le tirant d'ancrage (2) comportant à ses extrémités des dispositifs d'ancrage (7), munis chacun d'un disque d'ancrage (6) avec des forures pour le passage des éléments de traction (3),
    sachant que sur le côté du disque d'ancrage (6), opposé au côté à l'air, est agencé au moins un disque d'étanchéité (13) du tirant d'ancrage (2), lequel est traversé par les éléments de traction (3), sur lequel peut s'exercer une pression superficielle et en aval duquel est agencé un disque perforé (12) du tirant d'ancrage (2), faisant fonction d'écarteur,
    le disque d'étanchéité (13), sur le côté opposé au disque d'ancrage (6), étant immobilisé en mouvement longitudinal par rapport à la gaine tubulaire (10) et
    une plaque de pression (14a) du tirant d'ancrage (2), laquelle est également traversée par les éléments de traction (3), étant en appui sur la face du disque d'étanchéité (13), orientée vers le disque d'ancrage (6), et
    des moyens du tirant d'ancrage (2), destinés à transmettre la pression, étant prévus entre le disque d'ancrage (6) et la plaque de pression (14a),
    caractérisé en ce que
    la longueur des moyens (16) transmettant la pression est dimensionnée de telle sorte qu'un mouvement longitudinal du disque d'ancrage (6), généré lors de la mise en tension des éléments de traction (3) et orienté en direction de la gaine tubulaire (10), provoque l'application de la pression superficielle sur le disque d'étanchéité (13) par l'intermédiaire des moyens (16) transmettant la pression.
  2. Tirant d'ancrage selon la revendication 1, caractérisé en ce que le disque d'étanchéité (13), sur le côté opposé au disque d'ancrage (6), est en appui contre le disque perforé (12) qui est lui-même immobilisé en mouvement longitudinal par rapport à la gaine tubulaire (10).
  3. Tirant d'ancrage selon la revendication 2, caractérisé en ce que sur le côté du disque perforé (12), opposé au disque d'ancrage (6), vient en appui une plaque d'acier (14b), qui est elle-même immobilisée en mouvement longitudinal par rapport à la gaine tubulaire (10) et forme une butée pour le disque perforé (12) et le disque d'étanchéité (13).
  4. Tirant d'ancrage selon l'une quelconque des revendications 1 à 3, caractérisé en ce que pour immobiliser le disque d'étanchéité (12) et/ou le disque perforé (13) et/ou la plaque d'acier (14b), des butées, telles qu'un tube de butée (15) sont prévues sur la face intérieure de la gaine tubulaire (10).
  5. Tirant d'ancrage selon l'une quelconque des revendications 1 à 4, caractérisé en ce que pour former les moyens transmettant la pression, il est prévu au moins un tube de pression (16).
  6. Tirant d'ancrage selon la revendication 5, caractérisé en ce qu'il est prévu un tube de pression (16), dont le diamètre extérieur est quelque peu plus petit que le diamètre intérieur de la gaine tubulaire (10).
  7. Tirant d'ancrage selon la revendication 6, caractérisé en ce que le tube de pression (16) et la plaque de pression (14) sont assemblés l'un à l'autre pour former un élément en forme de godet.
  8. Tirant d'ancrage selon l'une quelconque des revendications 1 à 7, caractérisé en ce que dans la zone de l'entrée des éléments de traction (3) dans le corps d'ancrage (10), il est prévu des butées pour retenir les gaines (5) entourant les torons (4).
  9. Tirant d'ancrage selon la revendication 8, caractérisé en ce que les butées sont formées par une plaque de retenue (17), qui comporte des forures dont le diamètre correspond sensiblement au diamètre extérieur des torons (4) dégagés des gaines (5).
  10. Tirant d'ancrage selon la revendication 9, caractérisé en ce que la plaque de retenue (17) est en appui par rapport au disque d'ancrage (6).
  11. Tirant d'ancrage selon la revendication 10, caractérisé en ce que la plaque de retenue (17) est maintenue à distance du disque d'ancrage (6).
  12. Tirant d'ancrage selon l'une quelconque des revendications 1 à 11, caractérisé en ce que les éléments de traction (3), dans la zone de leur passage à travers le disque d'étanchéité (13), sont logés séparément de manière mobile dans le sens longitudinal dans des tubes (23), face auxquels agit la garniture d'étanchéité.
  13. Tirant d'ancrage selon la revendication 12, caractérisé en ce que les tubes (23) prennent appui contre la plaque de retenue (17).
EP04017158A 2003-08-02 2004-07-21 Tendon protégé contre la corrosion, en particulier pour béton précontraint Expired - Lifetime EP1505223B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20311950U DE20311950U1 (de) 2003-08-02 2003-08-02 Korrosionsgeschütztes Zugglied, insbesondere Spannglied für Spannbeton
DE20311950U 2003-08-02

Publications (2)

Publication Number Publication Date
EP1505223A1 EP1505223A1 (fr) 2005-02-09
EP1505223B1 true EP1505223B1 (fr) 2006-11-22

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EP04017158A Expired - Lifetime EP1505223B1 (fr) 2003-08-02 2004-07-21 Tendon protégé contre la corrosion, en particulier pour béton précontraint

Country Status (7)

Country Link
US (1) US7174684B2 (fr)
EP (1) EP1505223B1 (fr)
JP (1) JP4683876B2 (fr)
CN (1) CN100371551C (fr)
AT (1) ATE346199T1 (fr)
DE (2) DE20311950U1 (fr)
ES (1) ES2274353T3 (fr)

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DE102013215136A1 (de) 2013-08-01 2015-02-05 Dywidag-Systems International Gmbh Korrosionsgeschütztes Zugglied und plastisch verformbare Scheibe aus Korrosionsschutzmaterial für ein derartiges Zugglied
CN105604332B (zh) * 2016-01-20 2018-06-22 威胜利工程有限公司 钢绞线穿线引导装置
CN106049251B (zh) * 2016-07-29 2018-08-10 安徽金星预应力工程技术有限公司 一种具有双定位器的多层防腐鞍座端部密封装置
CN108951421B (zh) * 2018-08-30 2023-07-25 柳州欧维姆机械股份有限公司 一种适用于拉索外pe护套热胀冷缩的防水装置
CN111844388B (zh) * 2020-07-15 2021-12-21 陕西建工第一建设集团有限公司 一种混凝土预制构件模具
CN112900267B (zh) * 2021-01-12 2022-10-04 中国建筑第八工程局有限公司 碳纤维板束的张拉锚固系统及其张拉方法
CN113309296A (zh) * 2021-06-21 2021-08-27 马献林 一种纤维复合材料拉索弹性锚具
CN113463515B (zh) * 2021-07-18 2023-01-03 广西路建工程集团有限公司 一种双重密封拉索锚具的施工方法
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US11965334B1 (en) * 2024-01-11 2024-04-23 King Faisal University Multi-layer wedge anchorage for fiber-reinforced polymer (FRP) plates and tendons

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Also Published As

Publication number Publication date
DE502004002057D1 (de) 2007-01-04
US20050034392A1 (en) 2005-02-17
ATE346199T1 (de) 2006-12-15
JP2005054568A (ja) 2005-03-03
DE20311950U1 (de) 2004-12-09
CN100371551C (zh) 2008-02-27
US7174684B2 (en) 2007-02-13
EP1505223A1 (fr) 2005-02-09
CN1594798A (zh) 2005-03-16
ES2274353T3 (es) 2007-05-16
JP4683876B2 (ja) 2011-05-18

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