EP1554447A1 - Tensioning device for strip-shaped tension members - Google Patents

Tensioning device for strip-shaped tension members

Info

Publication number
EP1554447A1
EP1554447A1 EP03809255A EP03809255A EP1554447A1 EP 1554447 A1 EP1554447 A1 EP 1554447A1 EP 03809255 A EP03809255 A EP 03809255A EP 03809255 A EP03809255 A EP 03809255A EP 1554447 A1 EP1554447 A1 EP 1554447A1
Authority
EP
European Patent Office
Prior art keywords
tensioning
tension member
tension
anchor
clamping
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
EP03809255A
Other languages
German (de)
French (fr)
Other versions
EP1554447B1 (en
Inventor
Markus Maier
Hans-Peter ANDRÄ
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.)
Leonhardt Andra und Partner Beratende Ingenieure VBI GmbH
Original Assignee
Leonhardt Andra und Partner Beratende Ingenieure VBI GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leonhardt Andra und Partner Beratende Ingenieure VBI GmbH filed Critical Leonhardt Andra und Partner Beratende Ingenieure VBI GmbH
Publication of EP1554447A1 publication Critical patent/EP1554447A1/en
Application granted granted Critical
Publication of EP1554447B1 publication Critical patent/EP1554447B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • 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
    • E04C5/085—Tensile members made of fiber reinforced plastics
    • 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
    • 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
    • E04C5/127—The tensile members being made of fiber reinforced plastics
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E04G21/121—Construction of stressing jacks
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0255—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements whereby the fiber reinforced plastic elements are stressed
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0255—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements whereby the fiber reinforced plastic elements are stressed
    • E04G2023/0259—Devices specifically adapted to stress the fiber reinforced plastic elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0262—Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off

Definitions

  • the invention relates to a tensioning device for band-shaped tension members on structures, in particular
  • a tensioning device is attached to one end of the tension member, which is removed again after the tensioning process and the attachment of the tension member to the concrete structure, for example by permanent clamping and / or gluing.
  • a tensioning device of the type mentioned at the beginning (DE 198 49 605 AI)
  • the free end of the band-shaped tension member is clamped in a temporary tension anchor, which is moved by means of press elements, for example hydraulic cylinders, from a tensioning crossbar detachably attached to the base plate in lateral guides, whereby the tension member is tensioned.
  • press elements for example hydraulic cylinders
  • the tension anchor can only be held in a stable position against the concrete surface by rigidly connecting the lateral guides to the tension cross-beam in order to absorb the bending stresses that arise when the tension anchor deflects. This requires considerable design effort, which not only makes the tensioning device difficult and unwieldy, but also increases the space requirement, so that a relatively large recess must be made in the concrete surface for the arrangement of the tensioning device.
  • the object of the invention is therefore to design a tensioning device of the type mentioned at the outset in such a way that the tensioning anchor is held stable in its desired position by the forces occurring during the tensioning process, without the guides being subjected to bending stress.
  • a support that slidably supports the tension member at least upwards Guide body between the tensioning crossbeam and the tensioning anchor is arranged stationary.
  • the guide body forms a deflection point arranged on the tensioning side at a distance in front of the tensioning crossbar
  • Tension member If the support point 'of the press elements and the lateral guides, such as guide bars, viewed on the clamping cross-member as a hinge, so the clamping anchor can only move along a circular path whose radius is greater than the existing between the Fuhrungskorper and the clamping anchor spacing. In order to allow this pivoting movement of the tension anchor, the tension member would have to be stretched and thus tensioned even further.
  • the tension force exerted by the tension member on the tension anchor therefore keeps the tension anchor stable in its predetermined position on the structure, for example the concrete surface, without the guide rods being subjected to bending stress.
  • the guide rods which are only subjected to pressure, can therefore; run relatively slim because. they do not have to transmit bending moments.
  • the tensioning device as a whole is light and relatively narrow, so that its lateral space requirement is small and the size of the required recess in the surface of the structure, for example the concrete surface, is limited.
  • the guide body supporting the tension member upward is arranged in the region of the tension member and thus does not protrude laterally beyond the guide rods, it does not increase the dimensions of the tensioning device.
  • the guide body slidably receives the tension member in a guide slot, so that all-round guidance of the tension member is achieved.
  • the guide body is attached to a guide support which is connected rigidly to the tensioning crossbeam.
  • the hold-down force applied to stabilize the tension member is transmitted directly to the tensioning beam.
  • the guide carrier is preferably arranged on the upper side of the tension member and has side sections which project laterally beyond the tension member and are detachably connected to a bracket located under the tension member. This allows the guide body having a guide slot after completion of the clamping process and the determination of the
  • Tension member can be solved in a simple manner.
  • the press elements lie in the plane of the tension member and that the tensioning anchor is supported by block or the like. takes place in the plane of the tension member.
  • an unstable equilibrium is achieved during tensioning and in the locked state, which only has to be secured by the guide body without the guide body having to absorb significant forces.
  • FIG. 1 is a plan view of a band-shaped tension member attached to a concrete structure with an anchoring device on its fixed side and a tensioning device on its tensioning side,
  • Fig. 3 is a section along the line III-III in Fig. 1 and
  • Fig. 4 is a schematic representation of the
  • a band-shaped tension member 1 for example a carbon fiber reinforced plastic lamella, is intended for attachment to the surface of a supporting structure, in the illustrated embodiment of a concrete supporting structure 2. It can also be used with other structures, for example made of steel or wood. Before it is attached to the concrete structure 2, the tension member 1 must be prestressed.
  • the tension member 1 is fixed to a base plate 5 by means of a clamping plate 3, on which a plurality of clamping brackets 4 act, which is provided by dowels 6 and an adhesive layer 7 in a recess 8 of the concrete structure 2 is set.
  • a base plate 9 is fixed at the tension-side end (left in FIGS. 1 and 2) of the tension member 1 by means of dowels 10 and an adhesive layer 11 in a recess 12 of the concrete structure 2.
  • a clamping plate not yet shown in FIGS.
  • the tensioning device 13 has a tensioning crossbar 14 which is provided with two tabs 15 which are detachably fastened to the base plate 9 by means of screws 16 on both sides of the tension member 1. A rigid, releasable connection between the tensioning crossbeam 14 and the base plate 9 is thus produced.
  • clamp side On the crossbar 14 are supported on the side facing away from the base plate 9 (referred to in this context as “clamping side”) two press elements 17, which in the exemplary embodiment shown as
  • Hydraulic cylinders are executed.
  • the two press elements 17 lie in the plane of the tension member 1. They press a tension anchor 18 away from the tensioning cross member 14.
  • the tensioning anchor 18 is guided on both sides on lateral guide rods 19 which are connected to the tensioning crossbar 14. In its tensioned position, the tensioning anchor 18 can be fixed on the lateral guide rods 19, so that it is then also supported on the tensioning crossbar 14 via the guide rods 19 after the press elements 17 have been released.
  • another type of block can be chosen, around which Support tension anchor 18. The support or block is in this embodiment in the plane of the tension member 1st
  • the tension anchor 18 has a lower plate 20 on which the tension member 1 rests.
  • the tension member 1 is by
  • a guide beam 24 is made in one piece with the tensioning crossbar 14, welded to it or in some other way, for example by means of screws, rigidly attached to the tensioning crossbar 14 and forms at its free end a guide body 25 lying on the upper side of the tension member 1, which is between the tensioning crossbar 14 and the tension anchor 18 and is arranged at a distance from the tensioning side to the tensioning crossbar 14.
  • .hinausragende side portions 26 which are detachably connected to a below the tension member 1 strap 27, preferably not necessarily connected by lateral screws 28.
  • the 'guide body 25 must be the clamping crosshead 14: it can fixedly mounted in other ways, e.g. be connected to the structure, here with the concrete structure 2.
  • a guide slot 29 is formed which slidably receives the tension member 1.
  • the guide body 25 forms a deflection point for the tension member 1, which is located on the tensioning side at a distance from the tensioning crossbar 14.
  • the clamping anchor 18 has a possibility of movement on a radius R which is equal to the distance between the clamping crossbar 14 and the clamping anchor 18.

Abstract

The tension device has a tension bar (14) detachably fixed on a base plate permanently fixed on the support structure. A tension anchor (18) is clamped to the traction member and can be moved by pressing elements (17). A guide member (25) which supports the traction member at least for sliding movement upwards is mounted locally fixed between the tension bar (14) and tension anchor. The guide member has a guide slot in which the traction member can slide.

Description

Spannvorrichtung für bandförmige ZuggliederTensioning device for band-shaped tension members
Die Erfindung betrifft eine Spannvorrichtung für bandförmige Zugglieder an Tragwerken, insbesondereThe invention relates to a tensioning device for band-shaped tension members on structures, in particular
Betontragwerken, mit einer Spanntraverse, die an einer dauerhaft am Tragwerk befestigten Grundplatte lösbar befestigt ist, wobei ein mit dem bandförmigen Zugglied durch Klemmung verbundener Spannanker mittels sich an der Spanntraverse abstützender Pressenelemente zum Spannen des Zugglieds verschiebbar und an der Spanntraverse oder der Grundplatte abstützbar ist.Concrete structures, with a tendon that is releasably attached to a base plate permanently attached to the structure, whereby a tension anchor connected to the band-shaped tension member by clamping can be displaced by means of press elements that are supported on the tension crossbar for tensioning the tension member and can be supported on the tension crossmember or the base plate.
Zur Erhöhung der Tragfähigkeit (Ertüchtigung) oder zur Wiederherstellung der ursprünglichen TragfähigkeitTo increase the load-bearing capacity (strengthening) or to restore the original load-bearing capacity
(Sanierung) von Tragwerken aus Stahlbeton oder Spannbeton ist es bekannt, nachträglich an der Betonoberfläche vorgespannte bandförmige Zugglieder anzubringen. Als Zugglieder werden beispielsweise lamellenartige Kunststoffbänder mit eingelagerten Kohlefasern verwendet. Zur Verankerung werden beispielsweise Grundplatten aus Stahl in Ausnehmungen der Betonoberfläche angedübelt und/oder durch Klebung befestigt .(Renovation) of structures made of reinforced concrete or prestressed concrete, it is known to subsequently attach pre-stressed band-shaped tension members to the concrete surface. For example, lamellar plastic tapes with embedded carbon fibers are used as tension members. For anchoring, base plates made of steel, for example, are anchored in recesses in the concrete surface and / or fastened by gluing.
Um die erforderliche Vorspannung auf das bandförmigeTo the required bias on the band-shaped
Zugglied vor dessen bleibender Verankerung aufzubringen, wird an einem Ende des Zuggliedes eine Spannvorrichtung angesetzt, die nach dem Spannvorgang und der Festlegung des Zuggliedes am Betontragwerk, beispielsweise durch permanente Klemmung und/oder Klebung, wieder abgenommen wird. Bei einer bekannten Spannvorrichtung der eingangs genannten Gattung (DE 198 49 605 AI) wird das freie Ende des bandförmigen Zuggliedes in einen temporären Spannanker geklemmt, der mittels Pressenelementen, beispielsweise Hydraulikzylindern, von einer an der Grundplatte lösbar angebrachten Spanntraverse in seitlichen Führungen wegbewegt wird, wobei das Zugglied gespannt wird. Zur Festlegung der erreichten Spannendstellung wird der Spannanker gegen die Grundplatte verklotzt. Nach der permanenten Verankerung des Zuggliedes durch Klemmung und/oder Klebung wird die Spannvorrichtung abgenommen.To apply the tension member before its permanent anchoring, a tensioning device is attached to one end of the tension member, which is removed again after the tensioning process and the attachment of the tension member to the concrete structure, for example by permanent clamping and / or gluing. In a known tensioning device of the type mentioned at the beginning (DE 198 49 605 AI), the free end of the band-shaped tension member is clamped in a temporary tension anchor, which is moved by means of press elements, for example hydraulic cylinders, from a tensioning crossbar detachably attached to the base plate in lateral guides, whereby the tension member is tensioned. To determine the tension end position reached, the tension anchor is blocked against the base plate. After the tension member has been permanently anchored by clamping and / or gluing, the tensioning device is removed.
Der Spannanker kann nur dadurch in einer stabilen, an der Betonoberfläche anliegenden Stellung gehalten werden, dass die seitlichen Führungen biegesteif mit der Spanntraverse verbunden werden, um die bei einem Ausweichen des Spannankers nach oben auftretenden Biegebeanspruchungen aufzunehmen. Dies macht einen erheblichen konstruktiven Aufwand erforderlich, wodurch die Spannvorrichtung nicht nur schwer und unhandlich wird, sondern sich auch der Platzbedarf erhöht, so dass für die Anordnung der Spannvorrichtung eine verhältnismäßig große Aussparung in der Betonoberfläche hergestellt werden muss.The tension anchor can only be held in a stable position against the concrete surface by rigidly connecting the lateral guides to the tension cross-beam in order to absorb the bending stresses that arise when the tension anchor deflects. This requires considerable design effort, which not only makes the tensioning device difficult and unwieldy, but also increases the space requirement, so that a relatively large recess must be made in the concrete surface for the arrangement of the tensioning device.
Aufgabe der Erfindung ist es daher, eine Spannvorrichtung der eingangs genannten Gattung so auszubilden, dass der Spannanker durch die beim Spannvorgang auftretenden Kräfte stabil in seiner gewünschten Stellung gehalten wird, ohne dass es zu einer Biegebeanspruchung der Führungen kommt .The object of the invention is therefore to design a tensioning device of the type mentioned at the outset in such a way that the tensioning anchor is held stable in its desired position by the forces occurring during the tensioning process, without the guides being subjected to bending stress.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass ein das Zugglied zumindest nach oben gleitbar abstützender Führungskörper zwischen der Spanntraverse und dem Spannanker ortsfest angeordnet ist.This object is achieved according to the invention in that a support that slidably supports the tension member at least upwards Guide body between the tensioning crossbeam and the tensioning anchor is arranged stationary.
Der Führungskörper bildet eine spannseitig im Abstand vor der Spanntraverse angeordnete Umlenkstelle für dasThe guide body forms a deflection point arranged on the tensioning side at a distance in front of the tensioning crossbar
Zugglied. Wenn man die Abstützstelle' der Pressenelemente und der seitlichen Führungen, beispielsweise FührungsStangen, an der Spanntraverse als Gelenk betrachtet, so kann sich der Spannanker nur auf einer Kreisbahn bewegen, deren Radius größer ist als der zwischen dem Fuhrungskorper und dem Spannanker bestehende Abstand. Um diese Schwenkbewegung des Spannankers zuzulassen, üsste das Zugglied gedehnt und damit noch weiter gespannt werden. Die vom Zugglied auf den Spannanker ausgeübte Spannkraft hält daher den Spannanker in seiner vorgegebenen Lage am Tragwerk, beispielsweise der Betonoberfläche stabil, ohne dass es hierbei zu einer Biegebeanspruchung der Führungsstangen kommt. Die ausschließlich auf Druck beanspruchten FührungsStangen können daher; verhältnismäßig schlank ausgeführt werden, da. sie keine Biegemomente übertragen müssen. Dadurch wird die Spannvorrichtung insgesamt leicht und verhältnismäßig schmal, so dass ihr seitlicher Platzbedarf gering ist und die Größe der erforderlichen Aussparung in der Tragwerksoberflache, beispielsweise Betonoberfläche beschränkt wird..Tension member. If the support point 'of the press elements and the lateral guides, such as guide bars, viewed on the clamping cross-member as a hinge, so the clamping anchor can only move along a circular path whose radius is greater than the existing between the Fuhrungskorper and the clamping anchor spacing. In order to allow this pivoting movement of the tension anchor, the tension member would have to be stretched and thus tensioned even further. The tension force exerted by the tension member on the tension anchor therefore keeps the tension anchor stable in its predetermined position on the structure, for example the concrete surface, without the guide rods being subjected to bending stress. The guide rods, which are only subjected to pressure, can therefore; run relatively slim because. they do not have to transmit bending moments. As a result, the tensioning device as a whole is light and relatively narrow, so that its lateral space requirement is small and the size of the required recess in the surface of the structure, for example the concrete surface, is limited.
Da der das Zugglied nach oben abstützende Führungskörper im Bereich des Zuggliedes angeordnet ist und somit seitlich nicht über die FührungsStangen hinausragt, vergrößert er die Abmessungen der Spannvorrichtung nicht. Vorzugsweise nimmt der Führungskörper das Zugglied in einem Führungsschlitz gleitbar auf, so dass eine allseitige Führung des Zuggliedes erreicht wird.Since the guide body supporting the tension member upward is arranged in the region of the tension member and thus does not protrude laterally beyond the guide rods, it does not increase the dimensions of the tensioning device. Preferably, the guide body slidably receives the tension member in a guide slot, so that all-round guidance of the tension member is achieved.
Gemäß einer bevorzugten Ausführung der Erfindung ist vorgesehen, dass der Führungskörper an einem mit der Spanntraverse biegesteif verbundenen Führungsträger angebracht ist. Dadurch- wird die zur Stabilisierung des Zuggliedes aufgebrachte Niederhaltekraft unmittelbar auf die Spanntraverse übertragen. Eine gesonderte Befestigung des Führungskörpers, die beispielsweise am Betontragwerk möglich wäre, wird durch diese Ausgestaltung des Erfindungsgedankens entbehrlich.According to a preferred embodiment of the invention, it is provided that the guide body is attached to a guide support which is connected rigidly to the tensioning crossbeam. As a result, the hold-down force applied to stabilize the tension member is transmitted directly to the tensioning beam. A separate fastening of the guide body, which would be possible, for example, on the concrete supporting structure, is not necessary due to this embodiment of the inventive concept.
Vorzugsweise ist der Führungsträger an der Oberseite des Zuggliedes angeordnet und weist seitlich über das Zugglied hinausragende Seitenabschnitte auf, die mit einem unter dem Zugglied liegenden Bügel lösbar verbunden sind. Damit kann der einen Führungsschlitz aufweisende Führungskörper nach Beendigung des Spannvorgangs und der Festlegung desThe guide carrier is preferably arranged on the upper side of the tension member and has side sections which project laterally beyond the tension member and are detachably connected to a bracket located under the tension member. This allows the guide body having a guide slot after completion of the clamping process and the determination of the
Zuggliedes in einfacher Weise gelöst werden.Tension member can be solved in a simple manner.
Bevorzugt ist vorgesehen, dass die Pressenelemente in der Ebene des Zuggliedes liegen und dass die Abstützung des Spannankers durch Verklotzung od. dgl . in der Ebene des Zuggliedes erfolgt. Dadurch wird beim Spannen und im verklotzten Zustand ein labiles Gleichgewicht erreicht, das durch den Führungskörper nur gesichert werden muss, ohne dass der Führungskörper wesentliche Kräfte aufnehmen müsste. Die Erfindung wird nachfolgend an einem Ausführungsbeispiel näher erläutert, das in der Zeichnung dargestellt ist. Es zeigt :It is preferably provided that the press elements lie in the plane of the tension member and that the tensioning anchor is supported by block or the like. takes place in the plane of the tension member. As a result, an unstable equilibrium is achieved during tensioning and in the locked state, which only has to be secured by the guide body without the guide body having to absorb significant forces. The invention is explained in more detail below using an exemplary embodiment which is illustrated in the drawing. It shows :
Fig. 1 in einer Draufsicht ein an einem Betontragwerk angebrachtes bandförmiges Zugglied mit einer Verankerungseinrichtung an seiner Festseite und einer Spannvorrichtung an seiner Spannseite,1 is a plan view of a band-shaped tension member attached to a concrete structure with an anchoring device on its fixed side and a tensioning device on its tensioning side,
Fig. 2 einen Schnitt längs der Linie II-II in Fig. 1,2 shows a section along the line II-II in FIG. 1,
Fig. 3 einen Schnitt längs der Linie III-III in Fig. 1 undFig. 3 is a section along the line III-III in Fig. 1 and
Fig. 4 eine schematische Darstellung derFig. 4 is a schematic representation of the
Bewegungsverhältnisse an der Spannvorrichtung in einem Schnitt ähnlich der Fig. 2.Movement relationships on the clamping device in a section similar to FIG. 2.
Ein bandförmiges Zugglied 1, beispielsweise eine kohlefaserverstärkte Kunststofflamelle, ist zur Anbringung an der Oberfläche eines Tragwerkes, beim dargestellten Ausführungsbeispiel eines Betontragwerks 2 bestimmt. Ebenso ist auch der Einsatz bei anderen Tragwerken, beispielsweise aus Stahl oder Holz, möglich. Vor seiner Festlegung am Betontragwerk 2 muss das Zugglied 1 vorgespannt werden.A band-shaped tension member 1, for example a carbon fiber reinforced plastic lamella, is intended for attachment to the surface of a supporting structure, in the illustrated embodiment of a concrete supporting structure 2. It can also be used with other structures, for example made of steel or wood. Before it is attached to the concrete structure 2, the tension member 1 must be prestressed.
An seinem festseitigen Ende (rechts in den Fig. 1 und 2) ist das Zugglied 1 mittels einer Klemmplatte 3, auf die mehrere Klemmbügel 4 wirken, an einer Grundplatte 5 festgelegt, die durch Dübel 6 und eine Kleberschicht 7 in einer Ausnehmung 8 des Betontragwerks 2 festgelegt ist. In ähnlicher Weise ist am spannseitigen Ende (links in den Fig. 1 und 2) des Zuggliedes 1 eine Grundplatte 9 mittels Dübeln 10 und einer Kleberschicht 11 in einer Ausnehmung 12 des Betontragwerks 2 festgelegt. Bevor das spannseitige Ende des Zuggliedes 1 an der Grundplatte 9 ebenfalls durch eine Klemmplatte (in den Fig. 1 und 2 noch nicht dargestellt) und ggf. Klebung an der Grundplatte 9 verankert wird, muss das Zugglied 1 vorgespannt werden. Zu diesem Zweck wird eine Spannvorrichtung 13 angesetzt. Die Spannvorrichtung 13 weist eine Spanntraverse 14 auf, die mit zwei Laschen 15 versehen ist, die beiderseits des Zuggliedes 1 mittels Schrauben 16 lösbar an der Grundplatte 9 befestigt werden. Damit wird eine biegesteife, lösbare Verbindung zwischen der Spanntraverse 14 und der Grundplatte 9 hergestellt.At its fixed end (on the right in FIGS. 1 and 2), the tension member 1 is fixed to a base plate 5 by means of a clamping plate 3, on which a plurality of clamping brackets 4 act, which is provided by dowels 6 and an adhesive layer 7 in a recess 8 of the concrete structure 2 is set. In a similar manner, a base plate 9 is fixed at the tension-side end (left in FIGS. 1 and 2) of the tension member 1 by means of dowels 10 and an adhesive layer 11 in a recess 12 of the concrete structure 2. Before the tension-side end of the tension member 1 on the base plate 9 is also anchored by a clamping plate (not yet shown in FIGS. 1 and 2) and possibly gluing on the base plate 9, the tension member 1 must be prestressed. For this purpose, a tensioning device 13 is attached. The tensioning device 13 has a tensioning crossbar 14 which is provided with two tabs 15 which are detachably fastened to the base plate 9 by means of screws 16 on both sides of the tension member 1. A rigid, releasable connection between the tensioning crossbeam 14 and the base plate 9 is thus produced.
An der Spanntraverse 14 stützen sich auf der der Grundplatte 9 abgekehrten Seite (in diesem Zusammenhang als- "spannseitig" bezeichnet) zwei Pressenelemente 17 ab, die beim dargestellten Ausführungsbeispiel alsOn the crossbar 14 are supported on the side facing away from the base plate 9 (referred to in this context as “clamping side”) two press elements 17, which in the exemplary embodiment shown as
Hydraulikzylinder ausgeführt sind. Die beiden Pressenelemente 17 liegen in der Ebene des Zuggliedes 1. Sie drücken einen Spannanker 18 von der Spanntraverse 14- weg. Der Spannanker 18 ist beiderseits an seitlichen Führungsstangen 19 geführt, die mit der Spanntraverse 14 verbunden sind. In seiner Spannendstellung ist der Spannanker 18 an den seitlichen Führungsstangen 19 festlegbar, so dass er sich dann auch nach dem Lösen der Pressenelemente 17 über die FührungsStangen 19 an der Spanntraverse 14 abstützt. Statt dessen kann- auch eine andere Art der Verklotzung gewählt werden, um den Spannanker 18 abzustützen. Die Abstützung oder Verklotzung liegt bei dieser Ausführung in der Ebene des Zuggliedes 1.Hydraulic cylinders are executed. The two press elements 17 lie in the plane of the tension member 1. They press a tension anchor 18 away from the tensioning cross member 14. The tensioning anchor 18 is guided on both sides on lateral guide rods 19 which are connected to the tensioning crossbar 14. In its tensioned position, the tensioning anchor 18 can be fixed on the lateral guide rods 19, so that it is then also supported on the tensioning crossbar 14 via the guide rods 19 after the press elements 17 have been released. Instead of this, another type of block can be chosen, around which Support tension anchor 18. The support or block is in this embodiment in the plane of the tension member 1st
Der Spannanker 18 weist eine Unterplatte 20 auf, auf der das Zugglied 1 aufliegt. Das Zugglied 1 wird durchThe tension anchor 18 has a lower plate 20 on which the tension member 1 rests. The tension member 1 is by
Klemmbügel 21, Klemmschrauben 22 und eine Klemmplatte 23 gegen die Unterplatte 20 geklemmt und auf diese Weise an dem Spannanker 18 befestigt.Clamping bracket 21, clamping screws 22 and a clamping plate 23 clamped against the lower plate 20 and fastened in this way to the tension anchor 18.
Ein Führungsträger 24 ist einstückig mit der Spanntraverse 14 ausgeführt, an dieser angeschweißt oder in anderer Weise, beispielsweise mittels Schrauben biegesteif an der Spanntraverse 14 befestigt und bildet an seinem freien Ende einen an der Oberseite des Zuggliedes 1 liegenden Führungskörper 25, der sich zwischen der Spanntraverse 14 und dem Spannanker 18 befindet und in spannseitigem Abstand zu der Spanntraverse 14 angeordnet ist.A guide beam 24 is made in one piece with the tensioning crossbar 14, welded to it or in some other way, for example by means of screws, rigidly attached to the tensioning crossbar 14 and forms at its free end a guide body 25 lying on the upper side of the tension member 1, which is between the tensioning crossbar 14 and the tension anchor 18 and is arranged at a distance from the tensioning side to the tensioning crossbar 14.
Der an der Oberseite des Zuggliedes 1 angeordnete Führungskörper 25 weist seitlich über das Zugglied 1The guide body 25 arranged on the upper side of the tension member 1 laterally extends over the tension member 1
.hinausragende Seitenabschnitte 26 auf, die mit einem unter dem Zugglied 1 liegenden Bügel 27 lösbar verbunden sind, vorzugsweise über seitliche Schrauben 28. Der' Führungskörper 25 muss nicht notwendigerweise mit der Spanntraverse 14 verbunden sein: er kann auch in anderer Weise ortsfest angebracht, beispielsweise mit dem Tragwerk, hier mit dem Betontragwerk 2, verbunden sein..hinausragende side portions 26 which are detachably connected to a below the tension member 1 strap 27, preferably not necessarily connected by lateral screws 28. The 'guide body 25 must be the clamping crosshead 14: it can fixedly mounted in other ways, e.g. be connected to the structure, here with the concrete structure 2.
Zwischen dem Führungskörper 25 und dem Bügel 27 ist ein Führungsschlitz 29 gebildet, der das Zugglied 1 gleitbar aufnimmt . Wie in Fig. 4 schematisch dargestellt ist, bildet der Fuhrungskorper 25 eine Umlenkstelle für das Zugglied 1, die spannseitig im Abstand vor der Spanntraverse 14 liegt.Between the guide body 25 and the bracket 27, a guide slot 29 is formed which slidably receives the tension member 1. As is shown schematically in FIG. 4, the guide body 25 forms a deflection point for the tension member 1, which is located on the tensioning side at a distance from the tensioning crossbar 14.
Nimmt man an, dass die seitlichen Führungsstangen 19 nach Art von Pendelstützen gelenkig an der Spanntraverse 14 angebracht sind, so ergibt sich für den Spannanker 18 eine Bewegungsmöglichkeit auf einem Radius R, der gleich dem Abstand zwischen der Spanntraverse 14 und dem Spannanker 18 ist.If one assumes that the lateral guide rods 19 are articulated to the crossbar 14 in the manner of pendulum supports, the clamping anchor 18 has a possibility of movement on a radius R which is equal to the distance between the clamping crossbar 14 and the clamping anchor 18.
Für das aus dem Führungskörper 25 austretende Ende des Zuggliedes ergibt sich jedoch eine theoretische Bewegungsmöglichkeit auf einem Radius r, der dem Abstand zwischen dem Führungskörper 25 und dem Spannanker 18 entspricht und wesentlich kleiner ist als der Radius R. Um eine Bewegung des Spannankers 18 auf einer Kreisbahn mit dem konstruktiv vorgegebenen Bewegungsradius R zu ermöglichen, müsste daher das Zugglied 1- weiter gespannt werden. Der Spannanker 18 befindet sich somit in seiner in Fig. 4 gezeigten Lage in einer stabilen Stellung und wird in dieser stabilen Stellung gehalten, ohne dass hierbei eine Biegebeanspruchung der seitlichen FührungsStangen 19 erforderlich wäre. For the end of the tension member emerging from the guide body 25, however, there is a theoretical possibility of movement on a radius r, which corresponds to the distance between the guide body 25 and the tension anchor 18 and is significantly smaller than the radius R. To move the tension anchor 18 on one To enable a circular path with the constructionally specified movement radius R, the tension member 1 would therefore have to be stretched further. The tension anchor 18 is thus in its position shown in FIG. 4 in a stable position and is held in this stable position without the side guide rods 19 having to be subjected to bending stress.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Spannvorrichtung für bandförmige Zugglieder an Tragwerken, insbesondere Betontragwerken, mit einer Spanntraverse, die an einer dauerhaft am Tragwerk befestigten Grundplatte lösbar befestigt ist, wobei ein mit dem bandförmigen Zugglied durch Klemmung verbundener Spannanker mittels sich an der Spanntraverse abstützender Pressenelemente zum Spannen des Zugglieds verschiebbar und an der Spanntraverse oder der Grundplatte (9) abstützbar ist, dadurch gekennzeichnet, dass ein das Zugglied (1) zumindest' nach oben gleitbar abstützender Führungskörper (25) zwischen der Spanntraverse (14) und dem Spannanker (18) ortsfest angeordnet ist.1. Tensioning device for band-shaped tension members on structures, in particular concrete structures, with a tensioning crossbar which is detachably fastened to a base plate permanently fastened to the structure, a tensioning anchor connected to the band-shaped tensioning element being clamped by means of press elements which are supported on the tensioning crossmember for tensioning the tension member and is supported on the tensioning crossmember or the base plate (9), characterized in that the tension member (1) is arranged at least fixedly 'upwardly slidably abstützender guide body (25) between the tensioning crossmember (14) and the clamping anchor (18).
2. Spannvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Führungskörper (25) einen das Zugglied (1) gleitbar aufnehmenden Führungsschlitz (29) aufweist .2. Clamping device according to claim 1, characterized in that the guide body (25) has a guide slot (29) which slidably receives the tension member (1).
3. Spannvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Führungskörper (25) an einem mit der Spanntraverse (14) biegesteif verbundenen Führungsträger (24) angebracht ist. 3. Clamping device according to claim 1 or 2, characterized in that the guide body (25) on a with the clamping cross-member (14) rigidly connected guide beam (24) is attached.
. Spannvorrichtung nach Anspruch 3 , dadurch gekennzeichnet, dass der Führungskörper (25) an der Oberseite des Zuggliedes (1) angeordnet ist und seitlich über das Zugglied (1) hinausragende Seitenabschnitte (26) aufweist, die mit einem unter dem Zugglied (1) liegenden Bügel (27) lösbar verbunden sind., Clamping device according to claim 3, characterized in that the guide body (25) is arranged on the upper side of the tension member (1) and has side sections (26) which project laterally beyond the tension member (1) and which have a bracket located under the tension member (1) (27) are detachably connected.
5. Spannvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Pressenelemente in der Ebene des Zuggliedes liegen.5. Clamping device according to claim 1, characterized in that the press elements lie in the plane of the tension member.
6. Spannvorrichtung nach Anspruch 1 oder 5, dadurch gekennzeichnet, dass die Abstützung des Spannankers durch Verklotzung od. dgl. in der Ebene des Zuggliedes erfolgt. 6. Clamping device according to claim 1 or 5, characterized in that the support of the tension anchor is carried out by padding or the like. In the plane of the tension member.
EP03809255A 2002-10-23 2003-08-16 Tensioning device for strip-shaped tension members Expired - Lifetime EP1554447B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10249266A DE10249266B3 (en) 2002-10-23 2002-10-23 Tension device for belt-like traction members on concrete support structures has guide member locally fixed between tension bar and tension anchor and supporting traction member for sliding movement upwards
DE10249266 2002-10-23
PCT/EP2003/009079 WO2004038128A1 (en) 2002-10-23 2003-08-16 Tensioning device for strip-shaped tension members

Publications (2)

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EP1554447A1 true EP1554447A1 (en) 2005-07-20
EP1554447B1 EP1554447B1 (en) 2010-07-21

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EP (1) EP1554447B1 (en)
JP (1) JP2006504005A (en)
KR (1) KR20050032031A (en)
AT (1) ATE474981T1 (en)
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WO (1) WO2004038128A1 (en)

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DE10249266B3 (en) 2004-04-08
WO2004038128A1 (en) 2004-05-06
ATE474981T1 (en) 2010-08-15
JP2006504005A (en) 2006-02-02
DE50312912D1 (en) 2010-09-02
US20050252116A1 (en) 2005-11-17
AU2003253415A1 (en) 2004-05-13
DK1554447T3 (en) 2010-10-04
KR20050032031A (en) 2005-04-06
EP1554447B1 (en) 2010-07-21

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