EP0722024A1 - Corrosion protected free tension member, in particular tendon for prestressed concrete without bonding - Google Patents

Corrosion protected free tension member, in particular tendon for prestressed concrete without bonding 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
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EP
European Patent Office
Prior art keywords
tension member
member according
annular space
tension
casing
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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
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German (de)
French (fr)
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EP0722024B1 (en
Inventor
Oswald Dipl.-Ing. Nützel
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*DYWIDAG-SYSTEMS INTERNATIONAL G.M.B.H.
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Dyckerhoff and Widmann AG
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Publication of EP0722024A1 publication Critical patent/EP0722024A1/en
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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
    • E04C5/10—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.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The member is esp. a prestressing rod for concrete, and has at least one tensile element (12) inside a tubular sheath (4). The element can be a steel bar, wire or braid, which has at least one deviation along its path. The sheath has an outer jacket (5) at least at the positions of the deviations, and this has an inner jacket (6) which is separated from it by an annular space (7). The space is filled with a material which can harden. The outer jacket may be a tube with a smooth surface, and the inner jacket may be a tube with transverse ribs.

Description

Die Erfindung betrifft ein korrosionsgeschütztes freies Zugglied, insbesondere ein Spannglied für Spannbeton ohne Verbund, aus mindestens einem innerhalb einer rohrförmigen Umhüllung angeordneten Zugelement, wie Stahlstab, -draht oder -litze, das in seinem Verlauf mindestens einmal umgelenkt wird.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.

Bei der Errichtung von Bauwerken aus Spannbeton, insbesondere bei Brückenbauwerken, kennt man die Vorspannung mit und ohne Verbund. Vorspannung mit Verbund wird meist als Vorspannung mit nachträglichem Verbund ausgeführt. Hierbei werden die Spannglieder innerhalb des Betonquerschnitts in Spannkanälen längsbeweglich geführt, nach dem Erhärten des Betons gespannt und gegenüber dem Bauwerk verankert sowie durch Injizieren von Zementleim in die Spannkanäle in Verbund mit dem Bauwerk gebracht. Bei Vorspannung ohne Verbund liegen die Spannglieder meist außerhalb des Betonquerschnitts, sind jedoch gegenüber dem Bauwerk abgestützt; sie können so jederzeit besichtigt, nachgespannt und gegebenenfalls auch ausgewechselt werden.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. Here, 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. 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.

Bei Spanngliedern ohne Verbund, wie sie häufig auch als Schrägseile für Schrägseilbrücken, zur Sanierung von Bauwerken und für andere Bauaufgaben eingesetzt werden, ist es in der Regel nicht, wie bei einbetonierten Spanngliedern, möglich, die Spanngliedachse kontinuierlich gekrümmt dem Verlauf der Biegemomente anzupassen; es ist vielmehr notwendig, das Spannglied polygonzugartig zu führen. Dadurch entstehen Umlenkstellen, an denen die einzelnen Zugelemente, die das Spannglied bilden, dicht an der Innenseite ihrer in der Regel aus Kunststoff, meist PE, bestehenden rohrförmigen Umhüllung anliegen und beim Spannen radiale Druckkräfte auf die Abstützstelle am Bauwerk abgeben. Bei hohen Druckkräften kann dadurch die Kunststoffumhüllung ins Fließen geraten, so daß sowohl der Schutz vor mechanischen Beschädigungen, als auch der Korrosionsschutz beeinträchtigt werden, wenn nicht gar verloren gehen.With tendons without bond, as they are often used as stay cables for cable-stayed bridges, for the renovation of buildings and for other construction tasks, it is usually not possible, as with cast-in tendons, to continuously adapt the tendon axis to the curve of the bending moments; it is rather necessary to guide the tendon like a polygon. This results in deflection points at which the individual tension elements, which form the tendon, bear tightly against the inside of their tubular casing, which is usually made of plastic, usually PE, and give off radial compressive forces on the support point on the structure during tensioning. At high compressive forces, the plastic sheath can flow, so that both the protection against mechanical damage and the corrosion protection are impaired, if not lost.

Aber auch unter Normalbedingungen, d.h. wenn die Kunststoffumhüllung nicht ins Fließen kommt, liegen die Zugelemente unmittelbar an der Umhüllung an, so daß bei einem eventuellen späteren Verpressen der Umhüllung mit Korrosionsschutzmasse keine gezielte Mindestüberdeckung der Zugelemente durch die Korrosionsschutzmasse und damit kein sicherer Korrosionsschutz gewährleistet werden kann.But also under normal conditions, i.e. if the plastic sheathing does not flow, the tension elements lie directly on the sheathing, so that if the sheathing is later pressed with an anti-corrosive compound, no targeted minimum coverage of the tensile elements by the anti-corrosive compound and thus no reliable corrosion protection can be guaranteed.

Zur Lösung dieses Problems ist es aus der DE 37 34 954 C2 bekannt, die Zugelemente an den Umlenkstellen mittels Abstandhaltern, durch welche die einzelnen Zugelemente hindurchgeführt werden, in der Umhüllung zu fixieren und im Anschluß daran den Raum zwischen den Zugelementen und der Umhüllung mit erhärtendem Material zu verpressen. So werden überall im Bereich der Umlenkung eine ausreichende überdeckung der Zugelemente zur Gewährleistung des Korrosionsschutzes und eine gleichmäßige Lastverteilung erzielt. Der Einbau solcher Abstandhalter ist sehr aufwendig.To solve this problem, it is known from DE 37 34 954 C2 to fix the tension elements at the deflection points by means of spacers, through which the individual tension elements are passed, in the covering and then to harden the space between the tension elements and the covering Press material. Adequate coverage of the tension elements to ensure corrosion protection and an even load distribution are achieved everywhere in the area of the deflection. The installation of such spacers is very complex.

Vor diesem Hintergrund liegt der Erfindung die Aufgabe zugrunde, unter Berücksichtigung der Anforderungen an den Korrosionsschutz eine wirtschaftlichere Bauart für freie Spannglieder an deren Umlenkstellen anzugeben.Against this background, 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.

Gemäß der Erfindung wird diese Aufgabe durch ein Zugglied mit den Merkmalen des Anspruchs 1 gelöst.According to the invention, this object is achieved by a tension member with the features of claim 1.

Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.Advantageous further developments result from the subclaims.

Durch die zweischalige Umhüllung der Zugelemente im Bereich der Umlenkstelle mit einem durch erhärtendes Material injizierten Ringraum wird sichergestellt, daß selbst dann, wenn die - äußere - Kunststoffumhüllung unter dem radialen Anpreßdruck der einzelnen Zugelemente an der Umlenkstelle zusammengedrückt wird, noch immer eine ausreichende Überdeckung der Zugelemente durch das erhärtende Material und somit ein ausreichender Korrosionsschutz vorhanden ist. Durch die Wahl eines geeigneten Verpreßmaterials mit seinen spezifischen Eigenschaften kann man den jeweiligen Anforderungen an die Umhüllung hinsichtlich Festigkeit, Korrosionsschutz etc. gezielt nachkommen. Zudem sorgt das erhärtete Verpreßmaterial in Abhängigkeit von der Dicke der Schicht für eine gleichmäßige Lastverteilung auf die Unterlage.Due to the double-shell coating of the tension elements in the area 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. By choosing a suitable grouting material with its specific properties, you can meet the specific requirements for the covering with regard to strength, corrosion protection etc. In addition, depending on the thickness of the layer, the hardened grouting material ensures an even load distribution on the surface.

Bei Verwendung eines flexiblen gerippten Rohres für den inneren Mantel wird beim späteren Verpressen des Hohlraums zwischen dem inneren Mantel und den Zugelementen eine gute Verteilung des Verpreßmaterials und somit eine vollständige Einbettung der Zugelemente darin an der Umlenkstelle erreicht. Besteht zusätzlich auch der äußere Mantel aus einem flexiblen Material, so ist die zweischalige Umhüllung selbst insgesamt biegsam und paßt sich bei Belastung den jeweiligen Krümmungen der Umlenkstelle an, ohne dabei zu knicken oder sich zu einem ovalen Querschnitt zu verformen. Dies erlaubt eine Vorfertigung der rohrförmigen Umhüllung einschließlich des Verpressens des Ringraums, die dann nur noch an Ort und Stelle verlegt werden muß. Dadurch erlangt das erfindungsgemäße Zugglied einen weiteren wirtschaftlichen Vorteil gegenüber anderen Zuggliedern.When using a flexible finned tube for the inner jacket, a good distribution of the pressing material and thus a complete embedding of the tension elements therein is achieved at the deflection point when the cavity between the inner jacket and the tension elements is subsequently compressed. If the outer jacket also consists of a flexible material, 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.

Die erfindungsgemäße Ausführung des Zugglieds beschränkt sich aber nicht nur auf die Gestaltung der Umlenkstellen in seinem Verlauf. Sie läßt sich vielmehr bei Bedarf, wie z.B. bei erhöhten mechanischen Schutz- oder Feuerschutzerfordernissen, genausogut auf der freien Strecke, d.h. neben den Umlenkstellen in den übrigen Bereichen des Zugglieds einsetzen, aber auch im unmittelbaren Anschluß an eine Verankerung am Ende des Zugglieds.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.

Die Erfindung wird nachstehend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert. Es zeigen

Fig. 1
einen Längsschnitt durch eine erste Ausführungsform eines erfindungsgemäßen Zugglieds an einer Umlenkstelle,
Fig. 2
einen Querschnitt durch das in Fig. 1 dargestellte Zugglied entlang des Schnittes II-II,
Fig. 3
am Beispiel einer weiteren Ausführungsform die Entlüftung des Ringraumes beim Verpressen mit erhärtendem Material,
Fig. 4
einen Querschnitt entlang der Linie IV-IV in Fig. 3,
Fig. 5
eine Möglichkeit für die Entlüftung des inneren Hohlraumes beim Verpressen und
Fig. 6
einen Querschnitt entlang der Linie VI-VI in Fig. 5.
The invention is explained below with reference to an embodiment shown in the drawing. Show it
Fig. 1
2 shows a longitudinal section through a first embodiment of a tension member according to the invention at a deflection point,
Fig. 2
2 shows a cross section through the tension member shown in FIG. 1 along the section II-II,
Fig. 3
using the example of a further embodiment, the ventilation of the annular space when pressing with hardening material,
Fig. 4
3 shows a cross section along the line IV-IV in FIG. 3,
Fig. 5
a possibility for the ventilation of the inner cavity when pressing and
Fig. 6
a cross section along the line VI-VI in Fig. 5th

Die Fig. 1 und 2 zeigen ein erfindungsgemäßes Zugglied 1 im Bereich einer Umlenkstelle im Längs- und Querschnitt, wo es auf einem gekrümmten Sattel 2 eines Bauwerksteils 3 aufliegt. Die Erfindung betrifft hier lediglich den gekrümmten Bereich der rohrförmigen Umhüllung 4 des Zugglieds 1. Die Umhüllung 4 besteht hier aus einem äußeren Mantel 5 aus Kunststoff, z.B. Polyethylen, mit glatter Oberfläche, und einem innerhalb desselben in lichtem Abstand hiervon angeordneten inneren Mantel 6 aus einem mit Querrippen versehenen Rohr, das ebenfalls aus Kunststoff oder auch aus Blech bestehen kann. In der Zeichnung ist ein Kunststoffrohr mit Querrippen und etwa mäanderförmigem Längsschnitt dargestellt. Verwendbar sind aber auch schraubenlinienförmig gewickelte Rohre aus Blech mit entlang der Längsränder der schraubenlinienförmig verlaufenden Blechstreifen verlaufenden Rippen.1 and 2 show a tension member 1 according to the invention in the region of a deflection point in longitudinal and cross-section, where it rests on a curved saddle 2 of a structural part 3. The invention relates here only to the curved area of the tubular sheathing 4 of the tension member 1. 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. In the drawing, a plastic tube with transverse ribs and an approximately meandering longitudinal section is shown. However, it is also possible to use helically wound tubes made of sheet metal with ribs running along the longitudinal edges of the helically extending sheet metal strips.

Zwischen dem äußeren Mantel 5 und dem inneren Mantel 6 entsteht so ein Ringraum 7. Um einen definierten Abstand zwischen dem äußeren und dem inneren Mantel 5 bzw. 6 zu gewährleisten, sind Abstandhalter 8 angeordnet. Die Abstandhalter 8 sind ringförmig ausgebildet und mit Durchbrechungen oder Ausnehmungen, vornehmlich an ihrem äußeren, den äußeren Mantel 5 berührenden Rand versehen, um den Durchtritt des in den Ringraum 7 einzupressenden Materials zu ermöglichen. An den Stirnseiten ist der Ringraum 7 jeweils durch einen Dichtring 9 verschlossen. Über - hier nicht dargestellte - Injizierleitungen läßt sich der Ringraum 7 mit einem fließfähigen erhärtenden Material, wie z.B. Zement- oder Kunstharzmörtel, injizieren.An 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. At the end faces, 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.

An beiden Enden schließt die erfindungsgemäße Umhüllung 4 dicht, z.B. mittels Elektroschweißmuffen 10, an die Verrohrung 11 der freien Länge des Zugglieds 1 an. Kräfte, die beim Spannen der Zugelemente 12 auf den inneren Mantel 6 der Umhüllung 4 wirken und so ein Verschieben des inneren Mantels 6 verursachen könnten, werden über eine kraftschlüssige Verbindung zwischen dem innerem Mantel 6 und der Verrohrung 11 über diese abgetragen.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.

Beim Einbau eines erfindungsgemäßen Zugglieds 1 in ein Betonbauwerk wird in der Regel der Bereich der Umlenkstelle zuerst hergestellt. Die Arbeitsweise beim Einbau ist in den Fig. 3 und 4 sowie 5 und 6 veranschaulicht, allerdings am Beispiel eines über einen am Bauwerk gebildeten Sattel 2a symmetrisch geführten Zugglieds 1. Wie Fig. 3 erkennen läßt, wird dabei zunächst der Spannkanal durch Einbetonieren eines gekrümmten Schalungsrohres 13 gebildet. In dieses Schalungsrohr 13 wird sodann die rohrförmige Umhüllung 4, bestehend aus dem äußeren Mantel 5 und dem inneren Mantel 6 eingeschoben. Der Abstand zwischen dem inneren Mantel 6 und dem äußeren Mantel 5 wird durch Abstandhalter gesichert, die im Beispiel der Fig. 3 als Wendel 14 ausgebildet sind. An den Stirnseiten wird der Ringraum 7 zwischen dem äußeren Mantel 5 und dem inneren Mantel 6 durch Dichtungsringe 9 gedichtet.When a tension member 1 according to the invention is installed in a concrete structure, 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. As can be seen in FIG. 3, 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. At the end faces, the annular space 7 between the outer jacket 5 and the inner jacket 6 is sealed by sealing rings 9.

Sinnvollerweise wird der Ringraum 7 zwischen dem äußeren Mantel 5 und dem inneren Mantel 6 vorweg injiziert. Um den Ringraum vollständig füllen zu können, ist es notwendig, die Injizierleitung 15 an einem Tiefpunkt anzuschließen und am höchsten Punkt, also am Scheitelpunkt des Ringraumes 7, eine Entlüftungsleitung vorzusehen. Im Beispiel der Fig. 3 ist die Entlüftungsleitung 16 am oberen Scheitelpunkt angeschlossen; sie wird über einen Stutzen 17 durch den inneren Mantel 6 hindurch und möglichst hoch in den Ringraum 7 hineingeführt. Sowohl die Injizierleitung 15, als auch die Entlüftungsleitung 16 werden seitlich aus der Umhüllung 4 herausgeführt; sie werden nach Erhärten des Injiziermaterials wieder entfernt.It makes sense to inject the annular space 7 between the outer jacket 5 and the inner jacket 6 beforehand. In order to be able to fill the annular space completely, it is necessary to connect the injection line 15 at a low point and to provide a ventilation line at the highest point, that is to say at the apex of the annular space 7. In the example of FIG. 3, 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.

Nach diesen vorbereitenden Arbeiten werden die einzelnen Zugelemente 12, in der Regel Stahldrahtlitzen, eingeführt und die Verrohrung 11 im Bereich der freien Länge des Spannglieds an die Umhüllung 4 im Umlenkbereich angeschlossen. An der Umlenkstelle liegen die Zugelemente 12 infolge der erzwungenen Richtungsänderung dicht an der Innenfläche des inneren Mantels 6 an und drücken so die Umhüllung 4 im Umlenkbereich gegen das Schalungsrohr 13 bzw. das Betonbauteil.After this preparatory work, 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. At the deflection point, 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.

Der Hohlraum 18 innerhalb der Umhüllung 4 kann, wenn die einzelnen Zugelemente 12 aus sogenannten Fettlitzen bestehen, frei bleiben; handelt es sich um blanke, also nicht durch Fett und eine Umhüllung geschützte Litzen, so muß auch dieser Hohlraum mit Korrosionsschutzmasse verfüllt werden. Um auch hier ein vollständiges Ausfüllen zu erreichen, ist gemäß Fig. 5 im Hochpunkt der Umlenkung eine Entlüftungsleitung 19 mit einer Entlüftungsöffnung 20 vorgesehen, die durch eine Öffnung in der Verrohrung 11 nach außen geführt wird. Um diese Entlüftungsleitung 19 in der hohen Lage im oberen Bereich der Umhüllung 4 zu halten, sind in Abständen voneinander federnde Abstandhalter 21 angeordnet. Diese Abstandhalter 21 können beispielsweise aus kurzen Abschnitten eines Kunststoffrohres bestehen, die sich in der aus Fig. 6 ersichtlichen Weise zusammendrücken lassen und so die Entlüftungsleitung 19 im Scheitel der Umhüllung 4 halten.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. In order to achieve complete filling here too, 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. In order to keep this vent line 19 in the high position in the upper region of the casing 4, 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.

Claims (13)

Korrosionsgeschütztes freies Zugglied (1), insbesondere Spannglied für Spannbeton ohne Verbund, aus mindestens einem innerhalb einer rohrförmigen Umhüllung (4) angeordneten Zugelement (12), wie Stahlstab, -draht oder -litze, das in seinem Verlauf mindestens einmal umgelenkt wird, dadurch gekennzeichnet, daß die Umhüllung (4) zumindest an den Umlenkstellen aus einem äußeren Mantel (5) und einem in lichtem Abstand von diesem gehaltenen inneren Mantel (6) besteht und daß der dadurch entstehende Ringraum (7) mit einem erhärtenden Material ausgefüllt ist.Corrosion-protected free tension member (1), in particular tendon for prestressed concrete without composite, comprising at least one tension element (12), such as a steel rod, wire or strand, which is arranged within a tubular casing (4) and is deflected at least once in its course that the covering (4) at least at the deflection points consists of an outer jacket (5) and an inner jacket (6) held at a short distance from it and that the resulting annular space (7) is filled with a hardening material. Zugglied nach Anspruch 1, dadurch gekennzeichnet, daß der äußere Mantel (5) aus einem Rohr mit glatter Oberfläche besteht.Tension member according to claim 1, characterized in that the outer jacket (5) consists of a tube with a smooth surface. Zugglied nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der innere Mantel (6) aus einem Rohr besteht, das mit quer zu seiner Längsachse verlaufenden Rippen versehen ist.Tension member according to claim 1 or 2, characterized in that the inner jacket (6) consists of a tube which is provided with ribs running transversely to its longitudinal axis. Zugglied nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zur Fixierung des Abstandes zwischen dem äußeren Mantel (5) und dem inneren Mantel (6) Abstandhalter (8) angeordnet sind.Tension member according to one of claims 1 to 3, characterized in that spacers (8) are arranged for fixing the distance between the outer jacket (5) and the inner jacket (6). Zugglied nach Anspruch 4, dadurch gekennzeichnet, daß die Abstandhalter ringförmig ausgebildet sind und Durchbrechungen und/oder Ausnehmungen aufweisen.Tension member according to claim 4, characterized in that the spacers are ring-shaped and have openings and / or recesses. Zugglied nach Anspruch 4, dadurch gekennzeichnet, daß als Abstandhalter eine Wendel (14) aus Stahldraht vorgesehen ist.Tension member according to claim 4, characterized in that a helix (14) made of steel wire is provided as a spacer. Zugglied nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Ringraum zwischen dem inneren Mantel (6) und dem äußeren Mantel (5) stirnseitig mittels Dichtringen (9) verschlossen ist.Tension member according to one of claims 1 to 6, characterized characterized in that the annular space between the inner casing (6) and the outer casing (5) is closed on the end face by means of sealing rings (9). Zugglied nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das in dem Ringraum (7) befindliche erhärtende Material Zement- oder Kunstharzmörtel ist.Tension member according to one of claims 1 to 7, characterized in that the hardening material located in the annular space (7) is cement or synthetic resin mortar. Zugglied nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das im Ringraum (7) befindliche erhärtende Material bewehrt ist.Tension member according to one of claims 1 to 8, characterized in that the hardening material located in the annular space (7) is reinforced. Zugglied nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Umhüllung (4) biegsam ist.Tension member according to one of claims 1 to 9, characterized in that the covering (4) is flexible. Zugglied nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß der Hohlraum zwischen dem inneren Mantel (6) und den einzelnen Zugelementen (12) mit einer Vergußmasse ausgefüllt ist.Tension member according to one of claims 1 to 10, characterized in that the cavity between the inner casing (6) and the individual tension elements (12) is filled with a sealing compound. Zugglied nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die Umhüllung (4) im Bereich der Umlenkstelle dicht mit der anschließenden Verrohrung (11) des Zugglieds (1) verbunden ist.Tension member according to one of claims 1 to 11, characterized in that the covering (4) in the region of the deflection point is tightly connected to the subsequent piping (11) of the tension member (1). Zugglied nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß der äußere Mantel (5) der Umhüllung (4) kraftschlüssig mit der Verrohrung (11) verbunden ist.Tension member according to one of claims 1 to 12, characterized in that the outer casing (5) of the casing (4) is non-positively connected to the piping (11).
EP96100100A 1995-01-14 1996-01-05 Corrosion protected free tension member, in particular tendon for prestressed concrete without bonding Expired - Lifetime EP0722024B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29500560U 1995-01-14
DE29500560U DE29500560U1 (en) 1995-01-14 1995-01-14 Corrosion-protected free tension member, primarily tendon for prestressed concrete without bond

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EP0722024A1 true EP0722024A1 (en) 1996-07-17
EP0722024B1 EP0722024B1 (en) 1999-02-24

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JP (1) JP2796566B2 (en)
DE (2) DE29500560U1 (en)

Cited By (3)

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DE19743876A1 (en) * 1997-10-04 1999-04-29 Bilfinger Berger Bau Corrosion resistant tensioning member, e.g. for concrete support structures
WO2000036222A1 (en) * 1998-12-16 2000-06-22 Bilfinger + Berger Bauaktiengesellschaft External prestressing member
CN1710207B (en) * 2005-07-11 2010-11-03 上海市政工程设计研究院 Steel strand back-tension prestressed channel mudjacking method

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Publication number Priority date Publication date Assignee Title
DE19634682C2 (en) * 1996-08-28 1999-07-08 Dyckerhoff & Widmann Ag Seal for delimiting areas to be filled with a sealing compound on a bundle tension member for prestressed concrete
DE19845200C2 (en) * 1998-10-01 2002-09-26 Bilfinger Berger Ag Cladding tube for a tendon without bond
DE10134777B4 (en) * 2001-07-06 2008-11-20 Martin Krone Building and process for its production
EP2601344B1 (en) * 2010-08-03 2015-09-09 Soletanche Freyssinet Strand, structural cable and method for manufacturing the strand
CN109162206A (en) * 2018-10-30 2019-01-08 中国十七冶集团有限公司 A kind of constructing structure and its construction method of cast-in-situ box girder prestressed strand
CN112049027A (en) * 2020-09-04 2020-12-08 上海市机械施工集团有限公司 Remediation method for prestressed duct

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DE1130988B (en) * 1956-12-10 1962-06-07 Rudolf Buehrer Dipl Ing Tendon made of several individual wires or rods
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WO2000036222A1 (en) * 1998-12-16 2000-06-22 Bilfinger + Berger Bauaktiengesellschaft External prestressing member
CN1710207B (en) * 2005-07-11 2010-11-03 上海市政工程设计研究院 Steel strand back-tension prestressed channel mudjacking method

Also Published As

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

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