Prestressed carbon fiber board reinforcement system

Prestressed carbon fiber board reinforcement is an active reinforcement technology, which uses the high-strength and high-elasticity material characteristics of carbon fiber board to bond epoxy adhesive to concrete components, and pre-stresses the carbon fiber board through anchors assembled at both ends of the carbon board to form a new The force balance of the structure improves the bearing capacity of the structure.

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Product Introduction

Structral

The prestressed carbon fiber board reinforcement system is composed of carbon fiber board, anchoring system, carbon sheet glue, tension tooling and beading. Its structure is as follows:

Schematic diagram of prestressed carbon fiber sheet tension

Main Material Requirements

1. For carbon fiber board, see "Xin Shuo" carbon fiber I-class board technical parameters

2. Carbon plate anchor: The anchor should meet the requirements of static load anchoring performance and fatigue performance in the specification GBT 14370-2015 "Anchors, clamps and connectors for prestressing tendons": the static anchoring efficiency is not less than 90%, The carbon fiber board-anchor assembly shall pass the fatigue load performance test of 2 million times.

3. For carbon sheet adhesive, please refer to "Xin Shuo" carbon sheet adhesive technical parameters

4. Anticorrosive coatings for steel components All steel components involved in reinforcement require anticorrosive coating. The surface treatment of steel components is up to Sa2.5 level, and epoxy zinc-rich primer + epoxy (cloud iron) paint + topcoat is applied, and the performance indicators refer to relevant specifications.

Tchnological Process

1. Construction preparation, jack calibration, anchoring area and positioning of drilling positions, etc.;

2. Concrete surface treatment, clean up and leveling;

3. Drill and plant high-strength chemical bolts at the positions of the screw holes of the tension end and fixed end of the carbon fiber board according to the design drawings;

4. After the bolt is cured to reach the design strength, the installation of the tension end support and the fixed end support is started;

5. The surface of the carbon fiber board is cleaned with acetone before being pasted;

6. Apply adhesive on the contact surface of the carbon fiber board and the bottom of the beam, and apply adhesive on the contact surface of the anchor bottom plate and the bottom of the beam;

7. Install the carbon fiber board and hang the bead, the bead should not be too tight, otherwise it will affect the tension of the carbon fiber board;

8. Tension carbon fiber board and observe the change of beam deflection;

9. After the tension is completed, repair the gap of the carbon fiber board with repair glue and brush 5mm thick adhesive as the carbon board protective layer on both sides of the carbon fiber board (including the carbon fiber board);

10. Apply a layer of adhesive to the nuts of the anchor bolts, and then apply a layer of anti-rust grease on the surface of all metal parts to protect the anchors, screws, beading, etc.;

11. The high-strength, high-bonding epoxy resin mortar protective paint is used to protect the reinforced beam and the bottom of the slab.

Technical Parameter

Model	A	B	C	D	E	F	G	Hole size of installation anchor	Drilling size of mounting platen
CXS-2.0*50	104	144	88	144	90	1200	3 ~ 5M	4-Φ18x125	Φ12
CXS-3.0*50	104		88		90			4-Φ25x170
CXS-1.4*100	154		120		140			4-Φ25x170
CXS -2.0*100	154		120		140			4-Φ25x170

Note:

1. The size of anchors (including anchoring end plates combined with concrete structures) can be optimized according to specific conditions;

2. The model CXS-2.0*50 indicates the prestressed reinforcement system of 50mm wide and 2mm thick carbon fiber board, the other is the same;

3. According to customer requirements, other specifications of prestressed carbon fiber board reinforcement system can be provided.

Engineering Case

National Highway 110 Line K1055+182 Qianlishan Third Bridge Reinforcement Project

The project is located in Wuhai, Inner Mongolia, where prestressed carbon fiber plates are used to reinforce the slab beams to increase the bearing capacity. In this reinforcement and reconstruction project, 120 CXS-2.0*50 pre-stressed carbon fiber plates are used. Due to the thin bottom of the beam, the steel plate is used to thicken the beam at the end of the beam, and then the phytochemical anchor is used to ensure safety. Sex. The net length of a single carbon fiber board is 8m. The prestressed carbon fiber board controls the tensile stress to 1000MPa and the tensile force to 100kN.