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Application of carbon fiber reinforcement
Application of carbon fiber reinforcement in structural reinforcement and repair
1 Project Overview
A foreign-funded chemical company acquires a paint and paint chemical plant. Due to the need for process upgrades and remodeling, the foreign-funded company requires inspection and appraisal of the main production plant. The inspected factory building is a three-layer reinforced concrete frame structure, using pile foundation, and the building area of the factory building is about 5,200 square meters. After inspection by a professional inspection agency, it was found that the steel bar diameter of the main plant floor did not meet the original design requirements, and the necessary reinforcement measures should be taken for the inspected factory building.
2 Reinforcement design
Project defects
The diameter and number of the longitudinal reinforcement of the column inspected meet the design requirements. The deviation between the measured value and the distance between the diameter and spacing of the column stirrups inspected is within the range of the specified allowable deviation, which meets the design requirements.
The diameter and quantity of the bottom ribs of the spot-checked beams meet the design requirements. The deviation of the measured values of the diameter and spacing of the stirrups of the spot-checked beams from the design values is within the specified allowable deviation range and meets the design requirements.
The diameter of the steel slabs in the spot check and the diameter of the steel ribs in the slab at 3 points do not meet the design requirements. The deviation between the measured value and the design value of the spacing of the steel bars in the spot check is within the specified allowable deviation and meets the design requirements.
The deviation of the measured values of the column and beam geometric dimensions and floor thickness of the random inspection from the design value is within the range of the stipulated allowable deviation and meets the design requirements.
After analyzing the three points where the steel bars of the floor slabs do not match, it is found that, without exception, all the steel bars used in the horizontal and vertical bars have different diameters. In the original design drawings, separate reinforcement is used for the reinforcement of the floor slab. The upper support steel reinforcement and the lower overall reinforcement of each slab are individually configured, and the diameter spacing is different. This undoubtedly brings difficulty to the construction. The construction workers of the construction unit cannot check the drawings well enough to cause the above-mentioned problems to occur.
Because the carbon fiber reinforced plastic has the following characteristics:
(1) Light weight, construction is limited by space;
(2) High strength, with a certain flexibility, can cover the complex shape of the components, suitable for all kinds of components surface;
(3) Resistant to acid and alkali chemical corrosion and harsh environment;
(4) Good resistance to aging and water resistance;
(5) The storage life is long, the operation period is allowed to be long, and the base material can be various structural base materials such as concrete and masonry;
(6) High temperature resistance, good creep resistance, corrosion resistance and earthquake resistance under load
The reinforcement design uses carbon fiber equivalent strength calculation. The width of the carbon fiber cloth is 100mm and the thickness is 0.167mm. The design value of the tensile strength is 3 600MPa, and the distribution interval is 300mm.
3 Conclusion
After adopting the above-mentioned measures, the reinforcement project of the main production plant of the chemical company passed the final acceptance. It repaired the defects of the original plant at a relatively small cost, dispelled concerns for subsequent owners, and successfully completed the acquisition.
The possibility of post-technical upgrading and technological transformation of industrial production plants is not small, and there are more aspects involved. The reinforcement of the structure is adjusted to the adjustment of the technical layout to create the possibility. With the continuous improvement of the design and construction methods and experience, carbon fiber reinforcement, as one of the important methods of structural reinforcement and transformation, is increasingly showing its reliability, economy and practical operability
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High strength, unidirectional carbon fiber wrap pre-saturated to form a carbon fiber reinforced polymer (CFRP) wrap used to strengthen structural concrete elements.
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