EP1311734A2 - Dispositif de serrage d'elements de renforcement - Google Patents

Dispositif de serrage d'elements de renforcement

Info

Publication number
EP1311734A2
EP1311734A2 EP01974193A EP01974193A EP1311734A2 EP 1311734 A2 EP1311734 A2 EP 1311734A2 EP 01974193 A EP01974193 A EP 01974193A EP 01974193 A EP01974193 A EP 01974193A EP 1311734 A2 EP1311734 A2 EP 1311734A2
Authority
EP
European Patent Office
Prior art keywords
tensioning
clamping
clamping device
coupling member
reinforcing element
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.)
Withdrawn
Application number
EP01974193A
Other languages
German (de)
English (en)
Inventor
Josef Scherer
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE10040628A external-priority patent/DE10040628A1/de
Priority claimed from DE10040710A external-priority patent/DE10040710A1/de
Application filed by Individual filed Critical Individual
Publication of EP1311734A2 publication Critical patent/EP1311734A2/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • 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 reinforcing elements, in particular unidirectional fiber laminates of high tensile strength and the same tensile modulus, which are connected to structures or structural parts, in particular those with bending-stressed concrete.
  • at least one tensioning means provided with a power drive is provided, which acts on the one hand on a first coupling member connected to a reinforcing element and on the other hand on a second coupling member connected to the building or part of the building.
  • Devices of the type mentioned are known as a technique for the pretensioning of high-strength fiber laminates, such as those stuck on for repair and for the subsequent expansion of the load limits. It has been found in practice that the quality of the reinforcement is often due to non-uniform pre-stress distribution, especially across the width of the strip-shaped reinforcement elements, and also due to uncontrolled release of the pre-stress applied during the curing of the bond, i.e. before the high-strength shear connection between Laminate and concrete. Accordingly, the object of the invention is concerned with the creation of tensioning devices of the present type, which enable improved quality and reliability of the reinforcements with a rational production method.
  • FIG. 1 shows a side view of a laminate tensile reinforcement with tensioning device attached to the underside of a concrete ceiling
  • FIG. 2 shows a bottom view of the arrangement according to FIG. 1,
  • FIG. 3 shows a view corresponding to FIG. 2 of a tensioning device
  • FIG. 4 shows a view corresponding to FIG. 2 of a tensioning device with a rotatably mounted rolling pressure element
  • FIG. 5 is a plan view of a drive with a multiple
  • Piston unit trained drive unit for a clamping device Piston unit trained drive unit for a clamping device
  • FIG. 7 shows a functional circuit diagram of a tensioning device
  • the arrangement shown in FIGS. 1 and 2 comprises an elongated-striped reinforcement element V arranged on the ceiling surface of a concrete structure B, for example in the form of a preferably essentially unidirectional fiber laminate of high strength and the same tensile modulus.
  • the reinforcement element is already bonded to the ceiling surface with full shear strength in the initial state of the prestressing process and, if necessary, is additionally additionally bonded to a rigid anchor element AK, which in turn is connected directly to the concrete of the building, for example by dowels D.
  • the reinforcement element is glued flat and also highly rigid to a plate-shaped first coupling element Kl, which in turn - at least during the tensioning process - is not attached to the concrete ceiling, but is arranged to be displaceable relative to it.
  • the reinforcement element V fixed on the one hand with anchoring AK to the ceiling and on the other hand firmly connected to the coupling element Kl by the hardened adhesive bond on its upper side facing the ceiling with a suitable for high-strength connections Apply slowly curing adhesive.
  • a second coupling element K2 which is likewise plate-shaped in the example, can be subjected to high loads by means of dowels D, in particular in a shear-resistant manner, in such a way that this coupling element K2 shares the small thickness of the laminate reinforcing element V with overlaps a sufficient distance C so as not to impede the tensioning and possibly stretching process of the reinforcing element. The latter is then brought into contact with the ceiling surface and, if necessary, temporarily secured in this position.
  • Clamping means SM are then attached to the underside of the coupling element K2, which in the example comprises a hydraulic clamping cylinder SZ with a piston rod KS and an articulated head GK at the end.
  • the latter is connected by a swivel connection S1 designed as a pivot joint with a swivel axis A directed transversely to the piston rod KS to a compensating member AG designed as a two-joint bracket, which in turn is connected to the first coupling member Kl by means of such a swivel connection S2.
  • clamping means provided with a backstop device RSP and optionally also with a tensioning effect are provided.
  • pivoting wedges SK are articulated on the coupling member K2 by means of journal bearings Z symmetrically to the pull axis.
  • the correspondingly curved wedge pressure surfaces KD act on swivel drives AS on abutment journals WL of the first coupling member Kl under the effect of, for example, conventional swivel drives AS, which are therefore only indicated here by arc arrows, by means of appropriate design and dimensioning Self-locking with respect to the swivel movement.
  • the self-locking can be designed positively by means of sufficiently fine and appropriately asymmetrical, sawtooth-like teeth.
  • a strip-shaped laminate reinforcing member V with a first coupling element K 1 on the head side and associated pivot connection S1 and compensating member AG is provided.
  • a second swivel connection S2a is provided, which has a rolling pressure body WD interacting with a counter pressure surface GD.
  • FIG. 4 shows a construction similar to the preceding one, but with the essential difference that a pivot connection Sla is provided with a rotatably mounted, roller-shaped rolling pressure body Wda and with a counterpressure surface Gda concave in the direction opposite the clamping direction X.
  • This training enables extensive escape error compensation as well as in many cases sufficient offset error compensation with a self-centering effect, which allows a compact construction with only one swivel connection Sla.
  • the embodiment according to FIG. 5 is a clamping device with a double wedge gear, which is formed by a driving wedge pair KL1 and a driven wedge pair KL2.
  • a spindle S with, for example, the usual rotary rotary drive AS causes the wedge pair KL1 to move together and thus to move the wedge pair KL2 apart, which represents the clamping movement in the direction X, according to arrows P.
  • This wedge gear can also be advantageously designed simply with sufficient self-locking.
  • FIG. 6 shows a tensioning drive with a clamping device operated or activated as a backstop means RSP by means of a pressurized fluid.
  • a tensioning drive For tensioning in direction X, the pressure side DS of a piston KO located in a tensioning cylinder SZ is acted upon by pressure fluid via a feed connection (not shown).
  • sealing means Dia Separated from this tensioning drive part by sealing means Dia is a cylinder section acting for the anti-return means, within which the piston rod KS is surrounded by a radial contact surface BF by a clamping sleeve KH which is under high radial pressure and is secured in the cylinder against axial displacement.
  • An outer gap space SA formed on the outside of the clamping sleeve is provided with sealing means D2 and is normally kept pressure-free via a drain AF.
  • this connection can optionally also be provided by means of suitable valve and control means for an additional clamping pressure.
  • the piston rod is locked in place by the clamping friction and is therefore locked against reverse in the extended position (not shown).
  • the gap SR formed by surface roughness between the piston rod and clamping sleeve is connected via a pressure connection DA filled with pressure fluid and thus the clamping sleeve is subjected to an internal pressure which is sufficient for an elastic expansion of the sleeve and thus for a release of the piston rod.
  • end-side sealing means D1 are provided between the clamping sleeve and the piston rod KS in addition to the sealing means Dia already mentioned.
  • the control and regulating device shown in FIG. 7 comprises, in a simplified representation, tensioning means SM similar to the embodiment according to FIGS. 1 and 2, but with a pressure-operated clamping backstop RSP, e.g. such according to Fig. 6. It goes without saying that automatic backstops, possibly with tensioning means, can also be used here instead of the controlled backstop, which simplifies the control technology.
  • the system shown comprises a pressure fluid source DQ, which acts on the feed port E1 of the tensioning cylinder SZ with pressure fluid via an electromagnetically controllable switching valve VS1 and switches on the tensioning process on the reinforcing element in direction X.
  • a pressure measuring element DMG is inserted in the feed line between valve VS1 and connection El, the output of which is connected to one of two difference-forming inputs of a comparator VG. The other input of the latter is connected to an adjustable limit transmitter GWG.
  • the output of the comparator VG interrupts the supply of pressurized fluid when the predetermined limit value of the clamping pressure is reached by appropriately activating the valve VS1 and thus ends the clamping process.
  • the clamping backstop RSP had been deactivated for the purpose of releasing the clamping process, namely by connecting the clamping device through an E2 Also controlled by the comparator VG, the second switching valve VS2, which is in the open state, acted upon by the pressure fluid source and the clamping was released.
  • the comparator now reverses the switching valve VS2, so that the connection E2 is separated from the pressure fluid and connected to the outlet, that is to say it is relieved.
  • the clamp backstop is now activated according to the example in Fig. 6, and the pre-tensioned state is maintained until the bond between the reinforcing element and the structure has fully hardened.
  • the overall result is a tensioning device which comprises power-driven tensioning and tensioning means with backstop.
  • What is essential in the sense of a control loop is the DMG clamping force transducer, which is in operative connection with the reinforcing element to be tensioned or with the clamping means, and which supplies a clamping force signal corresponding to the voltage reached in the reinforcing element, and the limit value transmitter GWG, which corresponds to a limit value signal corresponding to the clamping force signal supplies.
  • This special control circuit is also the comparison device VG, which is controlled by the tension force measuring device and the limit value transmitter, which in turn controls a device operatively connected to the tensioning means, comprising the already mentioned components VS2 and SP for limiting the tensioning force in such a way that compliance and maintenance of predetermined tension values of the Reinforcing element can be maintained up to a sufficient solidification of the integral connection with the building.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

L'invention concerne un dispositif pour serrer des éléments de renforcement, en particulier des stratifiés de fibres unidirectionnelles présentant une résistance à la traction et un module d'élasticité en traction élevés, reliés à des constructions ou des parties de constructions, en particulier en béton soumis à des charges de flexion. Ce dispositif comprend au moins un moyen de serrage (SM) doté d'un entraînement mécanique, ce moyen de serrage étant en contact, d'un côté, avec un premier organe de couplage (K1) relié à au moins un élément de renforcement (V) et, de l'autre côté, avec un deuxième organe de couplage (K2) relié à la construction (B).
EP01974193A 2000-08-16 2001-08-15 Dispositif de serrage d'elements de renforcement Withdrawn EP1311734A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10040628A DE10040628A1 (de) 2000-08-16 2000-08-16 Vorrichtung zum Spannen von Verstärkungselementen
DE10040628 2000-08-16
DE10040710 2000-08-17
DE10040710A DE10040710A1 (de) 2000-08-17 2000-08-17 Vorrichtung zum Spannen von Verstärkungselementen
PCT/EP2001/009408 WO2002016710A2 (fr) 2000-08-16 2001-08-15 Dispositif de serrage d'elements de renforcement

Publications (1)

Publication Number Publication Date
EP1311734A2 true EP1311734A2 (fr) 2003-05-21

Family

ID=26006749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01974193A Withdrawn EP1311734A2 (fr) 2000-08-16 2001-08-15 Dispositif de serrage d'elements de renforcement

Country Status (3)

Country Link
EP (1) EP1311734A2 (fr)
AU (1) AU2001293776A1 (fr)
WO (1) WO2002016710A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108894122A (zh) * 2018-07-09 2018-11-27 睢宁县永华木业有限公司 一种预应力碳纤维板张拉锚固装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH701655B1 (de) * 2008-02-08 2011-02-28 Josef Scherer Verfahren und Vorrichtung zum Vorspannen von Verstärkungslaminaten an Bauwerken.
EP2447446A1 (fr) 2010-10-28 2012-05-02 Sika Technology AG Ancrage terminal d'éléments de traction sur des supports en béton armé
CN105862608B (zh) * 2016-05-20 2017-09-19 东南大学 一种预应力纤维板加固梁板的自动化张拉系统及方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT355765B (de) * 1977-02-16 1980-03-25 Manahl Robert Dipl Ing Verfahren zur verlegung vorgespannter be- wehrungsstaehle in aus beton zu fertigenden rotationssymmetrischen oder polygonalen bau- koerpern, sowie widerlager und spannpresse zur durchfuehrung des verfahrens
FR2507232A1 (fr) * 1981-06-09 1982-12-10 Freyssinet Int Stup Dispositif de mise en tension de barres de precontrainte et de determination de cette tension
FR2581409B1 (fr) * 1985-05-03 1987-07-10 Freyssinet Int Stup Perfectionnements aux dispositifs d'ancrage pour cables tendus
US5718090A (en) * 1996-06-24 1998-02-17 Wei-Hwang; Lin Prestressed concrete tensioning system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0216710A2 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108894122A (zh) * 2018-07-09 2018-11-27 睢宁县永华木业有限公司 一种预应力碳纤维板张拉锚固装置

Also Published As

Publication number Publication date
AU2001293776A1 (en) 2002-03-04
WO2002016710A2 (fr) 2002-02-28
WO2002016710A3 (fr) 2002-08-01

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