The new prestressing force can eliminate or slow down the stress lag phenomenon of the post-added members, so that the post-added members can effectively participate in the work of the original members, thus effectively reducing or even eliminating the phenomenon of strain lag of CFRP laminate, and achieving better reinforcement effect.
The construction process of HM pre-press FRP laminate for bridge.
Location and paying off
First, position and alignment for carbon fiber strip and anchor devices.
Drill hole
Then drill holes and polish the concrete surface in designed position.
Grooving
Slot along the both ends of the anchor devices, the groove depth is about 3cm.
Repairing and leveling
Repair the groove with repairing adhesive and polish after adhesive curing.
Planting anchor
Implant high-strength chemical bolts or high strength mechanical anchor bolt, anchor bolt level is not lower than 8.8 grade.
Instalingl bounding box
Install bounding box on the both sides and place in with anchor devices, keep the agreement on both ends of the centerline and fixed.
Install anchor box
Make sure that the tensioning and anchor block can slide freely within the bounding box.
Cutting carbon fiber laminate
Reserve 5 to 10 cm at the edge when cutting the carbon fiber strip.
Fixing carbon fiber laminate
Put the carbon fiber strip into wedge-shaped hole of tensioning and anchor block. Slid anchor block to starting position and fix tightly with fixture.
Fix jacketing and high strength anchor bolt
Assemble high-strength anchor bolts, gaskets, nuts, stop jack in tensioning end and adjust a tight top. Mike sure the stress direction of jack coincide with the centerline of the carbon fiber strip.
Prestreching
Make suitable protection to ensure safety of the construction and start pre-tension.
Apply epoxy resin adhesive
Apply epoxy resin adhesive on the surface of carbon fiber strip after uploading the pre-tension.
Prestress streching
Formal tensioning step by step, keep stress for 3 to 5 minutes, for every level tensioning and record the tensile strength and elongation. Then step to next level tensioning.
Removing the thread rod
Tight nuts after finished tensioning. Unloading jack, remove extra screw bolts.
Tablet fixing
Every 2 meters installed a tablet for slight pressure.
Fish product protection
The last step, make protective treatment of anchored devices and carbon fiber strop with anti-fire and anti-corrosion coating.
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Lamelles en fibres de carbone est une lamelle de composite polymère extrudé par tirage et renforcé de fibres de carbone (CPFC), destiné au renforcement des structures de béton, de bois et de maçonnerie.
Renfort carbone par lamelle précontrainte, ce nouveau procédé permet de traiter des ouvrages, en béton armé ou précontraint, présentant une déformation trop importante ou un manque très important de rigidité.
Adhésif structurel pour coller des renforts en PRFC ou des plats métalliques
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