DEVICE AND METHOD FOR REINFORCING STRUCTURES WITH PRE-STRESSED FIBRE-REINFORCED-POLYMER LAMINATES

This invention discloses a pre-stressing system for retrofitting of reinforced concrete members with externally bonded fibre-reinforced-polymer (FRP) laminates in bending. An FRP pre-stressing system includes a clamping unit (1), a light frame for hydraulic jack (2) and anchoring plates (3). The nov...

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Bibliographische Detailangaben
Hauptverfasser:	Slaitas, Justas, Valivonis, Juozas
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BUILDING BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIRUSE BUILDING MATERIALS FIXED CONSTRUCTIONS FORMS HANDLING BUILDING MATERIALS ON THE SITE REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTINGBUILDINGS SCAFFOLDING SHUTTERING STRUCTURAL ELEMENTS
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Beschreibung
Zusammenfassung:	This invention discloses a pre-stressing system for retrofitting of reinforced concrete members with externally bonded fibre-reinforced-polymer (FRP) laminates in bending. An FRP pre-stressing system includes a clamping unit (1), a light frame for hydraulic jack (2) and anchoring plates (3). The novel clamping unit (1) comprises tempered steel grips with corrugated gripping surfaces (4) which are tightened with high strength bolts (5) in a steel frame (6). This invention also discloses using the epoxy adhesive (8) on both upper and lower corrugated contact surfaces of the grips (4) and the FRP laminate (7) surface parts being clamped by said grips (4). The result is more effective clamping with very low slipping possibility. This invention provides retrofitting and reinforcement solutions for concrete slabs, wide beams, and also smaller beams, by using the threaded rods (10) and additional steel plates (11) instead of anchor bolts (9).