EP2088259B1 - Device for pre-tensioning reinforcement elements on structures - Google Patents

Device for pre-tensioning reinforcement elements on structures Download PDF

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Publication number
EP2088259B1
EP2088259B1 EP09151200A EP09151200A EP2088259B1 EP 2088259 B1 EP2088259 B1 EP 2088259B1 EP 09151200 A EP09151200 A EP 09151200A EP 09151200 A EP09151200 A EP 09151200A EP 2088259 B1 EP2088259 B1 EP 2088259B1
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EP
European Patent Office
Prior art keywords
reinforcement
metal
laminate
box
laminates
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EP09151200A
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German (de)
French (fr)
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EP2088259A1 (en
Inventor
Josef Scherer
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S&P Clever Reinforcement Co AG
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Individual
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Priority to PL09151200T priority Critical patent/PL2088259T3/en
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    • 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
    • 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 device for tensioning unidirectional fiber laminates with high tensile strength and tensile modulus of elasticity.
  • the fiber laminates are bonded to the bending-stressed side of a concrete or reinforced concrete component under tension.
  • DE 102 49 266 B3 a device has become known, according to which is tensioned by means of hydraulic cylinders, in which case a blocking is carried out in the tensioned state.
  • DE 198 49 605 A1 shows a device with which also by means of hydraulic cylinders is tensioned, in which case the clamping position is secured with spacers in the tensioned state.
  • the object of the present invention is to provide an alternative device, by means of which a bias voltage is generated, which stops during the curing of the adhesive, but the voltage building part of the device after the construction of the bias voltage is removable, so that this part to another Devices for building the required there bias can be used, that is successively flying on a variety of devices can be used. This should make the construction site process more flexible and faster.
  • a device for biasing reinforcing laminates to buildings consisting of a clamping shoe for clamping the exciting reinforcing laminate end and a box-like metal body, which forms a flat base plate below and forms an open box at the top, the metal body by means of his Underside projecting screws indirectly with a building zugmony connectable and has at one end two screws, which are outside out of the local metal body wall vertically extendable to strike the laminate side end wall of the clamping shoe, and an associated cylinder-piston unit which can be inserted into the box-like metal body is, so that its one side on the inner wall of the box-like metal body finds a stop, and is held on the opposite side of the cylinder in the box wall cut out for this purpose and the piston in the same direction as the screws through this box wall is extendable through, for acting on the laminate side end wall of the clamping shoe.
  • the device for prestressing reinforcing laminates on structures consists of a clamping shoe 1 for clamping the reinforcing laminate end 2 to be clamped and a box-like metal body 3 which forms a flat base plate at the bottom and forms an open box at the top.
  • the metal body 3 is located on a Endverank ceremoniessplatte, which is zugraäftig connectable by means of projecting from its underside dowel screws 4 with a building 5.
  • the metal body 3 is connected very strongly to this Endverank ceremoniessplatte about more screws 14.
  • it has two setscrews 6, which are externally vertically extendable out of the local metal body outer side 7, to strike the laminate-side end wall 8 of the clamping shoe 1.
  • the device further includes an associated cylinder-piston unit 9, which is insertable into the box-like metal body 3.
  • an associated cylinder-piston unit 9 which is insertable into the box-like metal body 3.
  • its one side on the inner wall 10 of the box-like metal body 3 finds a stop, and on the opposite side of the cylinder 11 of the unit 9 is held in the box wall 12 cut out for this purpose.
  • the piston 13 is extendable in the same direction as the set screws 6 through this box wall 18 and serves to act on the laminate side end wall 8 of the clamping shoe 1.
  • the whole box-like metal body is preferably formed from an integrally machined from the solid aluminum block and has a length of about 30cm up. On its underside encloses a separate, to be lost in use, not visible here Endverank ceremoniessplatte.
  • the side walls 12 of the box-like metal body 3 are cut out from above, so that trapezoidal cutouts are formed. As a result, reinforcements are maintained, which reinforce the end walls together to increased traction
  • the associated clamping shoe 1 consists of two hingedly connected parts 15,16, as shown in the FIG. 2 is apparent. These parts have mutually matching curved clamping surfaces, for accurately fitting inclusion of a reinforcing laminate end 20 are used, and which can be pressed against each other by means of screw 21.
  • the end, directed in the direction of the clamped reinforcing laminate 2 wall 8 is at Wegklemmetem reinforcing laminate 2 perpendicular to the base side and is equipped with a concave Zentrierpfanne 22 as a coupling member into which the convex piston tip 23 fits.
  • the associated clamping shoe 1 is equipped on its front support edge with an angular plastic profile 17.
  • the side walls 12 of the box-like metal body 3 are cut out, and the end walls are made as high as the cylinder-piston unit 9 inserted in the metal body in its then-lying state.
  • FIG. 3 shows this a building 5 in the form of a bridge, the left fix rests and on the right of a dilatation bearing 24. At a bridge reinforcing laminates are typically glued to the bottom to increase the clamping force of the building 5.
  • screw dowel offset In the building as in FIG. 3 shown screw dowel offset.
  • the dowels are placed in the base made of concrete or reinforced concrete. Adhesive dowels or expansion dowels can be used. For example, four such dowels and screws 4 are displaced on each side. Here you can see only the front four screws 4, which obscure the view of the rear four.
  • the base is roughened and the adhesive 25 applied in the area where the fiber laminate 2 is applied, as in FIG. 4 shown.
  • the fiber laminate 2 is temporarily positioned in the adhesive.
  • the strip-shaped reinforcing laminate 2 extends between the two rows of screws. Thus, only the front screws 4 are visible, while those behind the reinforcing laminate 2 are not visible.
  • end anchoring plates 19 are applied to the reinforcing laminate 2 with another layer of adhesive 25 and tightened with the screws 4, so that the end anchoring plates 19 clamp the reinforcing laminate 2 in those places for provisional securing, as in FIG FIG. 5 shown.
  • the adhesive 25 is not yet cured, so that therefore the reinforcing laminate 2 can still pull under tension on the adhesive layer.
  • the tensioning devices are attached.
  • the metal body 3 are screwed by means of separate fastening screws 14 on the Endverank ceremoniessplatten 19 and braced vigorously with them.
  • the clamping shoes 1 are mounted and by screwing their hinged parts, the reinforcing laminate 2 is clamped between these parts 15,16.
  • the clamping shoes 1 are then on the building. Now, for biasing the reinforcing laminate 2 on its only one side of a hydraulic cylinder-piston unit 9 is inserted into the local metal body 3 and with a hand pump hydraulic fluid on the Hydraulic line 26 pumped into the same, so that the piston 13 extends and the clamping shoe 1 is applied.
  • the pressure force used in this case is about 120 kN in the order of magnitude and the path due to the prestressing is 2 to about 15 mm, depending on the length of the reinforcing laminate.
  • the coupling member in the form of the centering pan 22 ensures that the forces are introduced centrally into the fiber laminate.
  • eccentricities which arise during the clamping process are compensated. Namely, the unidirectional fiber laminate is incapable of absorbing eccentric stresses. Accordingly, the coupling member, that is, this centering pan 22 is of extraordinary importance for the clamping operation.
  • the pretensioning device is designed so that the tensioning device can be applied to both fin ends. In the case of on-site space problems, it is therefore possible, thanks to this clamping device, to carry out the clamping operation on the left or right-hand fin end.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Body Structure For Vehicles (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

The method involves producing pre-tensioning between a building and a clamping shoe (1) attached at a reinforcement laminate-end by using a hydraulic cylinder-piston unit (9) that is utilized in a device for tensioning. Pre-tensioning is maintained by driving a set-screw between a tensioning device and the clamping shoe. The piston unit is removed under retention of the pre-tensioning held by the screw. The tensioning device and the shoe are removed from a building after hardening of an adhesive. The shoe is provided for clamping of the laminate-ends and a box-type metal body (3). An independent claim is also included for a device for pre-tensioning of reinforcement laminates at a building.

Description

Die Erfindung betrifft eine Vorrichtung zum Spannen von unidirektionalen Faserlaminaten mit hoher Zugfestigkeit und ebensolchem Zugelastizitätsmodul. Die Faserlaminate werden auf der biegebeanspruchten Seite eines Beton respektive Stahlbetonbauteils unter Zugspannung stehend verklebt.The invention relates to a device for tensioning unidirectional fiber laminates with high tensile strength and tensile modulus of elasticity. The fiber laminates are bonded to the bending-stressed side of a concrete or reinforced concrete component under tension.

Vorrichtungen für diesen Zweck sind im Stand der Technik bekannt und werden für das Vorspannen von hochfesten Faserlaminaten beispielsweise in der Bauwerksinstandsetzung respektive Bauwerksertüchtigung bereits eingesetzt. Die endseitigen Enden der Faserlaminate werden in einem Klemmschuh verklemmt, welcher sodann in Richtung gegen das Faserlaminatende hin gegenüber dem Bauwerk verspannt werden muss. Bei den bisherigen Systemen wird die Spannvorrichtung, welche die Zugspannung im Faserlaminat aufbringt, am Objekt belassen, bis die Aushärtung des Klebstoffes, welcher zwischen dem Faserelement und dem Traggrundbeton respektive Stahlbeton aufgebracht wird, ausgehärtet ist.Devices for this purpose are known in the art and are already used for the prestressing of high-strength fiber laminates, for example, in the building repair or building upgrading. The end-side ends of the fiber laminates are clamped in a clamping shoe, which then has to be clamped in the direction towards the Faserlaminatende towards the building. In the previous systems, the tensioning device, which applies the tensile stress in the fiber laminate, left on the object until the curing of the adhesive, which is applied between the fiber element and the base concrete or reinforced concrete, is cured.

Aus DE 102 49 266 B3 ist eine Vorrichtung bekanntgeworden, gemäss welcher mittels Hydraulikzylindern gespannt wird, wobei dann im gespannten Zustand eine Verklotzung vorgenommen wird. DE 198 49 605 A1 zeigt eine Vorrichtung, mit welcher ebenfalls mittels Hydraulikzylindern gespannt wird, wobei dann im gespannten Zustand die Spannlage mit Distanzstücken gesichert wird.Out DE 102 49 266 B3 a device has become known, according to which is tensioned by means of hydraulic cylinders, in which case a blocking is carried out in the tensioned state. DE 198 49 605 A1 shows a device with which also by means of hydraulic cylinders is tensioned, in which case the clamping position is secured with spacers in the tensioned state.

Die Aufgabe der vorliegenden Erfindung ist es, eine alternative Vorrichtung anzugeben, mittels derer eine Vorspannung erzeugbar ist, welche während des Aushärtens des Klebstoffes anhält, wobei aber der die Spannung aufbauende Teil der Vorrichtung nach dem Aufbau der Vorspannung entfernbar ist, sodass dieser Teil an weiteren Vorrichtungen zum Aufbauen der dort benötigten Vorspannung einsetzbar ist, also nacheinander fliegend an einer Vielzahl von Vorrichtungen einsetzbar ist. Damit soll der Baustellenablauf flexibler und schneller werden.The object of the present invention is to provide an alternative device, by means of which a bias voltage is generated, which stops during the curing of the adhesive, but the voltage building part of the device after the construction of the bias voltage is removable, so that this part to another Devices for building the required there bias can be used, that is successively flying on a variety of devices can be used. This should make the construction site process more flexible and faster.

Diese Aufgabe wird gelöst von einem Vorrichtung zum Vorspannen von Verstärkungslaminaten an Bauwerken, bestehend aus einem Klemmschuh zum Einklemmen des zu spannenden Verstärkungslaminat-Endes und einem kastenartigen Metallkörper, der unten eine ebene Grundplatte bildet und oben einen offenen Kasten bildet, wobei der Metallkörper mittels aus seiner Unterseite ragenden Schrauben mittelbar mit einem Bauwerk zugkräftig verbindbar ist und an einem Ende zwei Stellschrauben aufweist, welche aussen aus der dortigen Metallkörperwand senkrecht ausfahrbar sind, um an der laminatseitigen Endwand des Klemmschuhs anzuschlagen, sowie eine zugehörige Zylinder-Kolbeneinheit, welche in den kastenartigen Metallkörper einlegbar ist, sodass ihre eine Seite an der Innenwand des kastenartigen Metallkörpers einen Anschlag findet, und auf der gegenüberliegenden Seite der Zylinder in der hierzu ausgeschnittenen Kastenwand gehalten ist und der Kolben in gleicher Richtung wie die Stellschrauben durch diese Kastenwand hindurch ausfahrbar ist, zum Beaufschlagen der laminatseitigen Endwand des Klemmschuhs.This object is achieved by a device for biasing reinforcing laminates to buildings, consisting of a clamping shoe for clamping the exciting reinforcing laminate end and a box-like metal body, which forms a flat base plate below and forms an open box at the top, the metal body by means of his Underside projecting screws indirectly with a building zugkräftig connectable and has at one end two screws, which are outside out of the local metal body wall vertically extendable to strike the laminate side end wall of the clamping shoe, and an associated cylinder-piston unit which can be inserted into the box-like metal body is, so that its one side on the inner wall of the box-like metal body finds a stop, and is held on the opposite side of the cylinder in the box wall cut out for this purpose and the piston in the same direction as the screws through this box wall is extendable through, for acting on the laminate side end wall of the clamping shoe.

In den Zeichnungen wird ein Ausführungsbeispiel dieser Spannvorrichtung in verschiedenen Phasen ihrer Anwendung gezeigt. Anhand dieser Zeichnungen wird die Spannvorrichtung im Detail beschrieben und das Verfahren des Spannens mit Hilfe dieser Spannvorrichtung wird erläutert.In the drawings, an embodiment of this tensioning device is shown at various stages of its application. With reference to these drawings, the tensioner will be described in detail and the method of tensioning by means of this tensioner will be explained.

Es zeigt:It shows:

Figur 1:FIG. 1:
Die Spannvorrichtung in Anwendungslage von schräg oben gesehen, bei einem anstatt an einer Decke auf einen Boden gelegten Verstärkungslaminat;The clamping device seen in the application position obliquely from above, with a laid instead of a ceiling on a floor reinforcement laminate;
Figur 2:FIG. 2:
Die Spannvorrichtung in Anwendungslage schematisch dargestellt von der Seite her gesehen;The clamping device in application position shown schematically from the side;
Figur 3:FIG. 3:
Eine Brücke mit den eingebrachten Dübelschrauben zur Vorbereitung des Aufbringens eines vorgespannten Verstärkungslaminates;A bridge with the dowel screws introduced to prepare for applying a prestressed reinforcing laminate;
Figur 4:FIG. 4:
Die Brücke mit den eingebrachten Dübelschrauben mit aufgebrachtem Klebstoff und darauf gelegtem Verstärkungslaminat;The bridge with the inserted dowel screws with adhesive applied and reinforcing laminate laid on top;
Figur 5:FIG. 5:
Die Brücke mit aufgeklebtem und mittels Endverankerungsplatten festgeklemmtem Verstärkungslaminat;The bridge with glued and clamped by Endanankerungsplatten reinforcing laminate;
Figur 6:FIG. 6:
Die Brücke mit dem verklebten und geklemmten Verstärkungslaminat mit angebauten Spannungsvorrichtungen im Hinblick auf die vorzunehmende Vorspannung.The bridge with the bonded and clamped reinforcing laminate with attached tensioning devices with regard to the pretensioning to be made.

Wie in Figur 1 ersichtlich besteht die Vorrichtung zum Vorspannen von Verstärkungslaminaten an Bauwerken aus einem Klemmschuh 1 zum Einklemmen des zu spannenden Verstärkungslaminat-Endes 2 und einem kastenartigen Metallkörper 3, der unten eine ebene Grundplatte bildet und oben einen offenen Kasten bildet. Der Metallkörper 3 liegt auf einer Endverankerungsplatte, die mittels aus seiner Unterseite ragenden Dübelschrauben 4 mit einem Bauwerk 5 zugkräftig verbindbar ist. Der Metallkörper 3 ist mit dieser Endverankerungsplatte über weitere Schrauben 14 sehr kräftig verbunden. An einem Ende weist er zwei Stellschrauben 6 auf, welche aussen aus der dortigen Metallkörperaussenseite 7 senkrecht ausfahrbar sind, um an der laminatseitigen Endwand 8 des Klemmschuhs 1 anzuschlagen. Die Vorrichtung schliesst des Weiteren eine zugehörige Zylinder-Kolbeneinheit 9 ein, welche in den kastenartigen Metallkörper 3 einsetzbar ist. Dabei findet ihre eine Seite an der Innenwand 10 des kastenartigen Metallkörpers 3 einen Anschlag, und auf der gegenüberliegenden Seite ist der Zylinder 11 der Einheit 9 in der hierzu ausgeschnittenen Kastenwand 12 gehalten. Der Kolben 13 ist in gleicher Richtung wie die Stellschrauben 6 durch diese Kastenwand 18 hindurch ausfahrbar und dient zum Beaufschlagen der laminatseitigen Endwand 8 des Klemmschuhs 1. Der ganze kastenartige Metallkörper ist vorzugsweise aus einem einstückig aus dem Vollen gefrästen Aluminiumblock gebildet und weist eine Länge von etwa 30cm auf. An seine Unterseite schliesst eine gesonderte, bei Anwendung zu verlierende, hier nicht sichtbare Endverankerungsplatte an. Die Seitenwände 12 des kastenartigen Metallkörpers 3 sind von oben ausgeschnitten, sodass trapezförmige Ausschnitte gebildet sind. Dadurch bleiben Verstärkungen erhalten, welche die endseitigen Wände miteinander auf erhöhte Zugkraft verstärken.As in FIG. 1 it can be seen that the device for prestressing reinforcing laminates on structures consists of a clamping shoe 1 for clamping the reinforcing laminate end 2 to be clamped and a box-like metal body 3 which forms a flat base plate at the bottom and forms an open box at the top. The metal body 3 is located on a Endverankerungsplatte, which is zugraäftig connectable by means of projecting from its underside dowel screws 4 with a building 5. The metal body 3 is connected very strongly to this Endverankerungsplatte about more screws 14. At one end, it has two setscrews 6, which are externally vertically extendable out of the local metal body outer side 7, to strike the laminate-side end wall 8 of the clamping shoe 1. The device further includes an associated cylinder-piston unit 9, which is insertable into the box-like metal body 3. In this case, its one side on the inner wall 10 of the box-like metal body 3 finds a stop, and on the opposite side of the cylinder 11 of the unit 9 is held in the box wall 12 cut out for this purpose. The piston 13 is extendable in the same direction as the set screws 6 through this box wall 18 and serves to act on the laminate side end wall 8 of the clamping shoe 1. The whole box-like metal body is preferably formed from an integrally machined from the solid aluminum block and has a length of about 30cm up. On its underside encloses a separate, to be lost in use, not visible here Endverankerungsplatte. The side walls 12 of the box-like metal body 3 are cut out from above, so that trapezoidal cutouts are formed. As a result, reinforcements are maintained, which reinforce the end walls together to increased traction.

Der zugehörige Klemmschuh 1 besteht aus zwei zueinander scharnierend verbundenen Teilen 15,16, wie das aus der Figur 2 ersichtlich ist. Diese Teile weisen zueinander passende gekrümmte Klemmflächen auf, zum passgenauen Einschluss eines Verstärkungslaminat-Endes 20 dienen, und die mittels Schraubverbindungen 21 aufeinander pressbar sind. Die endseitige, in Richtung des einzuklemmenden Verstärkungslaminates 2 gerichtete Wand 8 steht bei eingeklemmetem Verstärkungslaminat 2 senkrecht zur Grundseite und ist mit einer konkaven Zentrierpfanne 22 als Kupplungsorgan ausgerüstet ist, in welche die konvexe Kolbenspitze 23 einpasst. Wie man anhand von Figur 2 weiter erkennt, ist der zugehörige Klemmschuh 1 auf seiner vorderen Auflagekante mit einem winkelförmigen Kunststoff-Profil 17 bestückt. Die Seitenwände 12 des kastenartigen Metallkörpers 3 sind ausgeschnitten, und die Endwände sind so hoch gestaltet wie die in den Metallkörper eingelegte Zylinder-Kolbeneinheit 9 in ihrem dann liegenden Zustand.The associated clamping shoe 1 consists of two hingedly connected parts 15,16, as shown in the FIG. 2 is apparent. These parts have mutually matching curved clamping surfaces, for accurately fitting inclusion of a reinforcing laminate end 20 are used, and which can be pressed against each other by means of screw 21. The end, directed in the direction of the clamped reinforcing laminate 2 wall 8 is at eingeklemmetem reinforcing laminate 2 perpendicular to the base side and is equipped with a concave Zentrierpfanne 22 as a coupling member into which the convex piston tip 23 fits. How to get by FIG. 2 further recognizes, the associated clamping shoe 1 is equipped on its front support edge with an angular plastic profile 17. The side walls 12 of the box-like metal body 3 are cut out, and the end walls are made as high as the cylinder-piston unit 9 inserted in the metal body in its then-lying state.

Die Anwendung bzw. das mit dieser Spannvorrichtung durchgeführte Vorspannverfahren wird im Folgenden anhand der Figuren 3 bis 6 beschrieben. Die Figur 3 zeigt hierzu einen Baukörper 5 in Form einer Brücke, die links fix aufliegt und rechts auf einem Dilatationslager 24. An einer Brücke werden Verstärkungslaminate typischerweise an der Unterseite festgeklebt, um die Zuspannungskraft des Baukörpers 5 zu erhöhen. Zunächst werden in das Bauwerk wie in Figur 3 gezeigt Schraubendübel versetzt. Die Dübel werden in den Traggrund aus Beton respektive Stahlbeton versetzt. Es können Klebedübel oder Spreizdübel verwendet werden. Es werden zum Beispiel auf jeder Seite vier solche Dübel und Schrauben 4 versetzt. Man sieht hier nur die vorderen vier Schrauben 4, welche die Sicht auf die hinteren vier verdecken.The application or the biasing process performed with this tensioning device will be described below with reference to FIGS FIGS. 3 to 6 described. The FIG. 3 shows this a building 5 in the form of a bridge, the left fix rests and on the right of a dilatation bearing 24. At a bridge reinforcing laminates are typically glued to the bottom to increase the clamping force of the building 5. First, in the building as in FIG. 3 shown screw dowel offset. The dowels are placed in the base made of concrete or reinforced concrete. Adhesive dowels or expansion dowels can be used. For example, four such dowels and screws 4 are displaced on each side. Here you can see only the front four screws 4, which obscure the view of the rear four.

Danach wird der Traggrund aufgeraut und der Klebstoff 25 im Bereich, wo das Faserlaminat 2 appliziert wird, aufgetragen, wie in Figur 4 gezeigt. Im nächsten Schritt wird das Faserlaminat 2 provisorisch im Klebstoff positioniert. Das streifenförmige Verstärkungslaminat 2 verläuft zwischen den beiden Schraubenreihen. Man sieht hier also nur die vorderen Schrauben 4, während die hinter dem Verstärkungslaminat 2 liegenden nicht sichtbar sind. Anschliessend werden Endverankerungsplatten 19 mit einer weiteren Schicht Klebstoff 25 auf das Verstärkungslaminat 2 aufgebracht und mit den Schrauben 4 verspannt, sodass die Endverankerungsplatten 19 das Verstärkungslaminat 2 an jenen Stellen für eine provisorische Sicherung festklemmen, wie in Figur 5 gezeigt. Der Klebstoff 25 ist dabei noch nicht ausgehärtet, sodass also das Verstärkungslaminat 2 sich unter Zugspannung auf der Klebstoffschicht noch ziehen lässt.Thereafter, the base is roughened and the adhesive 25 applied in the area where the fiber laminate 2 is applied, as in FIG. 4 shown. In the next step, the fiber laminate 2 is temporarily positioned in the adhesive. The strip-shaped reinforcing laminate 2 extends between the two rows of screws. Thus, only the front screws 4 are visible, while those behind the reinforcing laminate 2 are not visible. Subsequently, end anchoring plates 19 are applied to the reinforcing laminate 2 with another layer of adhesive 25 and tightened with the screws 4, so that the end anchoring plates 19 clamp the reinforcing laminate 2 in those places for provisional securing, as in FIG FIG. 5 shown. The adhesive 25 is not yet cured, so that therefore the reinforcing laminate 2 can still pull under tension on the adhesive layer.

Im nächsten Schritt, wie in Figur 6 dargestellt, werden die Spannvorrichtungen angebracht. Hierzu werden die Metallkörper 3 mittels gesonderter Befestigungsschrauben 14 auf die Endverankerungsplatten 19 aufgeschraubt und mit ihnen kräftig verspannt. An die endseitigen Enden 20 des Laminates 2 werden die Klemmschuhe 1 montiert und durch Verschrauben deren scharnierender Teile wird das Verstärkungslaminat 2 zwischen diesen Teilen 15,16 eingeklemmt. Die Klemmschuhe 1 liegen sodann auf dem Baukörper auf. Jetzt wird zum Vorspannen des Verstärkungslaminates 2 auf dessen bloss einer Seite eine hydraulische Zylinder-Kolbeneinheit 9 in den dortigen Metallkörper 3 eingesetzt und mit einer Handpumpe wird Hydraulikflüssigkeit über die Hydraulikleitung 26 in dieselbe gepumpt, sodass der Kolben 13 ausfährt und den Klemmschuh 1 beaufschlagt. Die dabei zum Einsatz kommende Druckkraft beträgt in der Grössenordnung ca. 120 kN und der Weg infolge der Vorspannung beträgt je nach Länge des Verstärkungslaminates 2 bis ca. 15mm. Das Kupplungsorgan in Form der Zentrierpfanne 22 sorgt dafür, dass die Kräfte zentrisch in das Faserlaminat eingeleitet werden. Durch das Kuppelorgan in Form der Zentrierpfanne 22 werden Exzentritäten, welche beim Spannvorgang entstehen, ausgeglichen. Das unidrektionale Faserlaminat ist nämlich nicht in der Lage, exzentrische Spannungen aufzunehmen. Entsprechend ist das Kupplungsorgan, das heisst diese Zentrierpfanne 22 von ausserordentlicher Bedeutung für den Spannvorgang.In the next step, as in FIG. 6 shown, the tensioning devices are attached. For this purpose, the metal body 3 are screwed by means of separate fastening screws 14 on the Endverankerungsplatten 19 and braced vigorously with them. At the end-side ends 20 of the laminate 2, the clamping shoes 1 are mounted and by screwing their hinged parts, the reinforcing laminate 2 is clamped between these parts 15,16. The clamping shoes 1 are then on the building. Now, for biasing the reinforcing laminate 2 on its only one side of a hydraulic cylinder-piston unit 9 is inserted into the local metal body 3 and with a hand pump hydraulic fluid on the Hydraulic line 26 pumped into the same, so that the piston 13 extends and the clamping shoe 1 is applied. The pressure force used in this case is about 120 kN in the order of magnitude and the path due to the prestressing is 2 to about 15 mm, depending on the length of the reinforcing laminate. The coupling member in the form of the centering pan 22 ensures that the forces are introduced centrally into the fiber laminate. By means of the dome member in the form of the centering pan 22, eccentricities which arise during the clamping process are compensated. Namely, the unidirectional fiber laminate is incapable of absorbing eccentric stresses. Accordingly, the coupling member, that is, this centering pan 22 is of extraordinary importance for the clamping operation.

Sobald diese Vorspannung hydraulisch erzeugt wurde, werden die Stellschrauben 6 am Metallkörper 3 so verdreht, dass sie am Klemmschuh 1 anschlagen und somit die Spannung halten. Jetzt kann die hydraulische Zylinder-Kolbeneinheit 9 wieder vom Hydraulikdruck entlastet werden und dann ausgebaut werden. Ihr Einsatz erfolgt daher also fliegend. Dadurch wird der Baustellenablauf flexibler und schneller. Sobald nach ca. 24 Stunden die Aushärtung des Klebstoffes 25 abgeschlossen ist, können die Metallkörper 3 und die Klemmschuhe 1 entfernt werden. Der Abbindebeginn des Klebstoffes 25 ist so eingestellt, dass der Aushärtebeginn des Klebstoffes nach der Vollendung des Vorspannprozesses des Faserlaminates erfolgt.Once this bias has been generated hydraulically, the screws 6 are so twisted on the metal body 3, that they strike the clamping shoe 1 and thus hold the voltage. Now the hydraulic cylinder-piston unit 9 can be relieved again of the hydraulic pressure and then removed. Their use is therefore flying. This makes the construction site process more flexible and faster. Once after about 24 hours, the curing of the adhesive 25 is completed, the metal body 3 and the clamping shoes 1 can be removed. The setting start of the adhesive 25 is adjusted so that the beginning of curing of the adhesive takes place after the completion of the tempering process of the fiber laminate.

Mit der identischen Spannvorrichtung können am gleichen Tag mehrere Faser- bzw. Verstärkungslaminate vorgespannt werden. Die Vorrichtung zum Vorspannen ist so konzipiert, dass die Spannvorrichtung an beiden Lamellenenden aufgebracht werden kann. Bei bauseitigen Platzproblemen besteht somit, dank dieser Spannvorrichtung die Möglichkeit, den Spannvorgang am linken respektive rechten Lamellenende vorzunehmen.With the identical tensioning device, several fiber or reinforcing laminates can be pre-stressed on the same day. The pretensioning device is designed so that the tensioning device can be applied to both fin ends. In the case of on-site space problems, it is therefore possible, thanks to this clamping device, to carry out the clamping operation on the left or right-hand fin end.

Claims (6)

  1. Device to preload laminates for reinforcement on buildings comprising a gripping shoe (1) for gripping the end (20) of the reinforcement laminate to be clamped and comprising a body made of metal (3) in the form of a box, the said body forming a lower plan base plate and an upper opened box, whereby the body made of metal can be linked indirectly by screws projecting from the lower side of the body made of metal; said screws being tightly connected with the building and said body made of metal comprising at one end two setting screws (6) coming out externally and perpendicularly from the wall of the body made of metal (18) located therein to butt against the end wall (8) of the gripping shoe (1) on the side of the laminate.
  2. Device to preload reinforcement laminates situated on buildings according to claim 1, characterized in that the body made of metal (3) in the form of a box is constituted by an aluminium bloc which is cut in one piece from the solid and in that the said body presents on its lower face a separated end anchor-plate (19) which can be lost when used.
  3. Device to preload reinforcement laminates situated on buildings according to claim 1 to 2, characterized in that the lateral walls (12) of the metal body (3) in form of a box are cut.
  4. Device to preload reinforcement laminates situated on buildings according to claim 1 to 3, characterized in that the associated gripping shoe (1) is made of two parts (15, 16) which are connected to each other by means of hinges, e.g. of a lower part (15) having a curved gripping surface rising upwards together with an upper part (16) rising mirror inverted , whereby these two gripping surfaces can be pressed against each other by means of screw connexions (21) while an end of a reinforcement laminate (20) is included in an accurately fitting manner, and characterized in that the terminal wall which is oriented towards the reinforcement laminate to be gripped extends perpendicularly to the ground side in the case of a gripped reinforcement laminate (2); said terminal wall being equipped with a concave centring seat (23) of the piston (13) of the cylinder-piston unit (9).
  5. Device to preload reinforcement laminates situated on buildings according to claim 1 to 4, characterized in that the corresponding gripping shoe (1) is equipped on its front lower edge with an angular profile (17) made of plastic, realised as a sliding part.
  6. Device to preload reinforcement laminates situated on buildings according to claim 1 to 5, characterized in that the lateral walls (18) of the metal body (3) in form of a box are cut and in that the terminal walls are as tall as the piston-unit (9) according with its state once inserted in the metal body.
EP09151200A 2008-02-08 2009-01-23 Device for pre-tensioning reinforcement elements on structures Active EP2088259B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09151200T PL2088259T3 (en) 2008-02-08 2009-01-23 Device for pre-tensioning reinforcement elements on structures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH00177/08A CH701655B1 (en) 2008-02-08 2008-02-08 Method and apparatus for prestressing reinforcement laminates to structures.

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EP2088259A1 EP2088259A1 (en) 2009-08-12
EP2088259B1 true EP2088259B1 (en) 2011-10-12

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EP09151200A Active EP2088259B1 (en) 2008-02-08 2009-01-23 Device for pre-tensioning reinforcement elements on structures

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EP (1) EP2088259B1 (en)
AT (1) ATE528462T1 (en)
CH (1) CH701655B1 (en)
ES (1) ES2377266T3 (en)
PL (1) PL2088259T3 (en)
PT (1) PT2088259E (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4071321A1 (en) 2021-04-07 2022-10-12 Vilniaus Gedimino technikos universitetas Device and method for reinforcing structures with pre-stressed fibre-reinforced-polymer laminates

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105064696A (en) * 2015-09-06 2015-11-18 福州卓强加固工程有限公司 Prestressed carbon fiber plate tensioning apparatus
CN106703433B (en) * 2016-12-29 2022-09-13 华北水利水电大学 Prestressed fiber sheet combined assembly type tensioning device and construction method thereof
CN107859348B (en) * 2017-10-20 2020-05-05 长安大学 Active force application system for fiber fabric
CN112854801A (en) * 2021-01-08 2021-05-28 黄璟雯 Building structure reinforcing and connecting device

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
DE19849605A1 (en) * 1998-10-28 2000-05-04 Goehler Andrae Und Partner Ber Tensioning device for a band-shaped tension member
DE19944573A1 (en) * 1999-09-17 2001-03-22 Josef Scherer Reinforcement device for building structure and structural parts protects against tensile stress, particularly for concrete subjected to bending stress and comprises at least one tractive component extending along structural surface
WO2002016710A2 (en) * 2000-08-16 2002-02-28 Josef Scherer Device for tightening reinforcing elements
DE10249266B3 (en) * 2002-10-23 2004-04-08 Leonhardt, Andrä und Partner Beratende Ingenieure VBI GmbH 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
EP1507048A1 (en) * 2003-08-14 2005-02-16 Sika Technology AG Method for tensioning a composite material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4071321A1 (en) 2021-04-07 2022-10-12 Vilniaus Gedimino technikos universitetas Device and method for reinforcing structures with pre-stressed fibre-reinforced-polymer laminates

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Publication number Publication date
ES2377266T3 (en) 2012-03-26
PT2088259E (en) 2012-01-12
EP2088259A1 (en) 2009-08-12
ATE528462T1 (en) 2011-10-15
PL2088259T3 (en) 2012-06-29
CH701655B1 (en) 2011-02-28

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