EP0722024A1 - Membre tendu libre protégé contre la corrosion, notamment membre de précontrainte pour béton précontraint sans adhérence - Google Patents

Membre tendu libre protégé contre la corrosion, notamment membre de précontrainte pour béton précontraint sans adhérence Download PDF

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Publication number
EP0722024A1
EP0722024A1 EP96100100A EP96100100A EP0722024A1 EP 0722024 A1 EP0722024 A1 EP 0722024A1 EP 96100100 A EP96100100 A EP 96100100A EP 96100100 A EP96100100 A EP 96100100A EP 0722024 A1 EP0722024 A1 EP 0722024A1
Authority
EP
European Patent Office
Prior art keywords
tension member
member according
annular space
tension
casing
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
EP96100100A
Other languages
German (de)
English (en)
Other versions
EP0722024B1 (fr
Inventor
Oswald Dipl.-Ing. Nützel
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.)
*DYWIDAG-SYSTEMS INTERNATIONAL G.M.B.H.
Original Assignee
Dyckerhoff and Widmann AG
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Filing date
Publication date
Application filed by Dyckerhoff and Widmann AG filed Critical Dyckerhoff and Widmann AG
Publication of EP0722024A1 publication Critical patent/EP0722024A1/fr
Application granted granted Critical
Publication of EP0722024B1 publication Critical patent/EP0722024B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/10—Ducts
    • 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
    • E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables

Definitions

  • the invention relates to a corrosion-protected free tension member, in particular a tendon for prestressed concrete without composite, made of at least one tension element, such as a steel rod, wire or strand, which is arranged within a tubular casing and is deflected at least once during its course.
  • a tension element such as a steel rod, wire or strand
  • prestressing When erecting prestressed concrete structures, especially bridge structures, prestressing is known with and without bond. Prestressing with bond is usually carried out as prestressing with subsequent joining.
  • the tendons within the concrete cross-section are guided longitudinally in the tension channels, tensioned after the concrete has hardened and anchored in relation to the structure, and brought into the tension channels in connection with the structure by injecting cement paste.
  • the tendons When prestressing without bond, the tendons are usually outside the concrete cross-section, but are supported against the building; they can be viewed at any time, retensioned and, if necessary, replaced.
  • the invention has for its object to provide a more economical design for free tendons at their deflection points, taking into account the requirements for corrosion protection.
  • the deflection point with an annular space injected through hardening material ensures that even if the - outer - plastic sheath is pressed together under the radial contact pressure of the individual tension elements at the deflection point, the tension elements are still sufficiently covered by the hardening material and thus sufficient Corrosion protection is available.
  • a suitable grouting material with its specific properties, you can meet the specific requirements for the covering with regard to strength, corrosion protection etc.
  • the hardened grouting material ensures an even load distribution on the surface.
  • the double-shell covering itself is flexible overall and adapts to the respective curvatures of the deflection point without being bent or deforming into an oval cross section. This allows prefabrication of the tubular casing including the pressing of the annular space, which then only has to be installed on the spot. This gives the tension member according to the invention a further economic advantage over other tension members.
  • the inventive design of the tension member is not limited to the design of the deflection points in its course. Rather, it can be used just as well, such as with increased mechanical protection or fire protection requirements, on the free Route, ie use next to the deflection points in the other areas of the tension member, but also in the immediate connection to an anchorage at the end of the tension member.
  • the sheathing 4 here consists of an outer jacket 5 made of plastic, for example polyethylene, with a smooth surface, and an inner jacket 6 arranged within it within a short distance therefrom tube with cross ribs, also made of plastic or can also consist of sheet metal.
  • an outer jacket 5 made of plastic, for example polyethylene, with a smooth surface
  • an inner jacket 6 arranged within it within a short distance therefrom tube with cross ribs, also made of plastic or can also consist of sheet metal.
  • a plastic tube with transverse ribs and an approximately meandering longitudinal section is shown.
  • annular space 7 is thus created between the outer jacket 5 and the inner jacket 6.
  • Spacers 8 are arranged in order to ensure a defined distance between the outer and the inner jacket 5 or 6.
  • the spacers 8 are annular and are provided with openings or recesses, primarily on their outer edge touching the outer jacket 5, in order to allow the material to be pressed into the annular space 7 to pass through.
  • the annular space 7 is closed by a sealing ring 9.
  • the annular space 7 can be filled with a flowable hardening material, such as e.g. Inject cement or synthetic resin mortar.
  • the casing 4 according to the invention closes tightly at both ends, e.g. by means of electric welding sleeves 10 to the piping 11 of the free length of the tension member 1. Forces which act on the inner jacket 6 of the casing 4 when the tension elements 12 are tensioned and which could thus cause the inner jacket 6 to shift are dissipated via a non-positive connection between the inner jacket 6 and the piping 11.
  • the area of the deflection point is generally produced first.
  • the method of installation is illustrated in FIGS. 3 and 4 and 5 and 6, but using the example of a tension member 1 guided symmetrically over a saddle 2a formed on the structure.
  • the tensioning channel is first formed by concreting a curved formwork tube 13.
  • the tubular casing 4 consisting of the outer jacket 5 and the inner jacket 6 is then inserted into this formwork tube 13.
  • the distance between the inner jacket 6 and the outer jacket 5 is secured by spacers, which are designed as helix 14 in the example of FIG. 3.
  • the annular space 7 between the outer jacket 5 and the inner jacket 6 is sealed by sealing rings 9.
  • the vent line 16 is connected at the upper vertex; it is passed through a connector 17 through the inner jacket 6 and as high as possible into the annular space 7. Both the injection line 15 and the vent line 16 are led laterally out of the casing 4; they are removed after the injection material has hardened.
  • the individual tension elements 12 usually steel wire strands, are introduced and the piping 11 is connected to the sheathing 4 in the deflection area in the area of the free length of the tendon.
  • the tension elements 12 lie close to the inner surface of the inner jacket 6 as a result of the forced change of direction and thus press the covering 4 in the deflection area against the formwork tube 13 or the concrete component.
  • the cavity 18 within the envelope 4 can, if the individual tension elements 12 consist of so-called fat strands, remain free; If the strands are bare, that is, they are not protected by grease and a covering, this cavity must also be filled with anti-corrosion compound.
  • a vent line 19 with a vent opening 20 is provided at the high point of the deflection, as shown in FIG. 5, which is led to the outside through an opening in the piping 11.
  • spacers 21 which are resilient are arranged at intervals from one another. These spacers 21 can consist, for example, of short sections of a plastic tube which can be compressed in the manner shown in FIG. 6 and thus hold the ventilation line 19 in the apex of the casing 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP96100100A 1995-01-14 1996-01-05 Membre tendu libre protégé contre la corrosion, notamment membre de précontrainte pour béton précontraint sans adhérence Expired - Lifetime EP0722024B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29500560U DE29500560U1 (de) 1995-01-14 1995-01-14 Korrosionsgeschütztes freies Zugglied, vornehmlich Spannglied für Spannbeton ohne Verbund
DE29500560U 1995-01-14

Publications (2)

Publication Number Publication Date
EP0722024A1 true EP0722024A1 (fr) 1996-07-17
EP0722024B1 EP0722024B1 (fr) 1999-02-24

Family

ID=8002514

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96100100A Expired - Lifetime EP0722024B1 (fr) 1995-01-14 1996-01-05 Membre tendu libre protégé contre la corrosion, notamment membre de précontrainte pour béton précontraint sans adhérence

Country Status (3)

Country Link
EP (1) EP0722024B1 (fr)
JP (1) JP2796566B2 (fr)
DE (2) DE29500560U1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19743876A1 (de) * 1997-10-04 1999-04-29 Bilfinger Berger Bau Spannglied
WO2000036222A1 (fr) * 1998-12-16 2000-06-22 Bilfinger + Berger Bauaktiengesellschaft Element externe de precontrainte
CN1710207B (zh) * 2005-07-11 2010-11-03 上海市政工程设计研究院 一种钢绞线后张预应力孔道压浆方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19634682C2 (de) * 1996-08-28 1999-07-08 Dyckerhoff & Widmann Ag Dichtung zur Begrenzung von mit einer Vergußmasse auszufüllenden Bereichen an einem Bündelzugglied für Spannbeton
DE19845200C2 (de) * 1998-10-01 2002-09-26 Bilfinger Berger Ag Hüllrohr für ein Spannglied ohne Verbund
DE10134777B4 (de) * 2001-07-06 2008-11-20 Martin Krone Bauwerk und Verfahren zu seiner Herstellung
KR101732564B1 (ko) * 2010-08-03 2017-05-04 소레탄체 프레씨네트 스트랜드, 구조용 케이블 및 스트랜드 제조방법
CN109162206A (zh) * 2018-10-30 2019-01-08 中国十七冶集团有限公司 一种现浇箱梁预应力钢束的施工结构及其施工方法
CN112049027A (zh) * 2020-09-04 2020-12-08 上海市机械施工集团有限公司 预应力孔道的补救方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH299955A (de) * 1950-07-18 1954-07-15 Baur Willi Verfahren zum Herstellen von Bauteilen aus Spannbeton.
DE1130988B (de) * 1956-12-10 1962-06-07 Rudolf Buehrer Dipl Ing Spannglied aus mehreren Einzeldraehten oder -staeben
FR1587229A (fr) * 1968-10-25 1970-03-13
DE3734954A1 (de) * 1987-03-13 1988-04-07 Dyckerhoff & Widmann Ag Korrosionsgeschuetztes zugglied, vornehmlich spannglied fuer spannbeton ohne verbund und verfahren zu seinem einbau
FR2662725A1 (fr) * 1990-05-31 1991-12-06 Dyckerhoff & Widmann Ag Procede de fabrication d'un membre tendu compose d'un faisceau d'elements.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060640A (en) * 1959-06-11 1962-10-30 Span Tendons Ltd Cables for prestressing concrete
DE3734953C2 (de) * 1987-03-13 1994-02-24 Dyckerhoff & Widmann Ag Abstandhalter für ein spannbares Zugglied
DE3731722A1 (de) * 1987-09-21 1989-04-06 Suspa Spannbeton Gmbh Umlenkkoerper fuer spannelemente eines spanngliedes zur vorspannung von spannbetontragwerken
DE3831069A1 (de) * 1988-09-13 1990-03-22 Dyckerhoff & Widmann Ag Zugglied mit einer ummantelung und verfahren zu seiner herstellung
DE4118897A1 (de) * 1991-06-08 1992-12-10 Hochtief Ag Hoch Tiefbauten Bauwerkslagereinrichtung fuer ein spannglied und verfahren zum auswechseln eines solchen spanngliedes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH299955A (de) * 1950-07-18 1954-07-15 Baur Willi Verfahren zum Herstellen von Bauteilen aus Spannbeton.
DE1130988B (de) * 1956-12-10 1962-06-07 Rudolf Buehrer Dipl Ing Spannglied aus mehreren Einzeldraehten oder -staeben
FR1587229A (fr) * 1968-10-25 1970-03-13
DE3734954A1 (de) * 1987-03-13 1988-04-07 Dyckerhoff & Widmann Ag Korrosionsgeschuetztes zugglied, vornehmlich spannglied fuer spannbeton ohne verbund und verfahren zu seinem einbau
FR2662725A1 (fr) * 1990-05-31 1991-12-06 Dyckerhoff & Widmann Ag Procede de fabrication d'un membre tendu compose d'un faisceau d'elements.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19743876A1 (de) * 1997-10-04 1999-04-29 Bilfinger Berger Bau Spannglied
WO2000036222A1 (fr) * 1998-12-16 2000-06-22 Bilfinger + Berger Bauaktiengesellschaft Element externe de precontrainte
CN1710207B (zh) * 2005-07-11 2010-11-03 上海市政工程设计研究院 一种钢绞线后张预应力孔道压浆方法

Also Published As

Publication number Publication date
DE29500560U1 (de) 1996-05-15
JPH08253982A (ja) 1996-10-01
JP2796566B2 (ja) 1998-09-10
EP0722024B1 (fr) 1999-02-24
DE59601319D1 (de) 1999-04-01

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