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carbon fiber plate for concrete bridge strengthening retrofitting
The longer the working hours of the bridge, many of its diseases will gradually be exposed. At this time, corresponding technical support is needed to increase the service life of the bridge and appropriately extend the life of the bridge. Practice shows that the carbon fiber plate reinforcement technology can enhance the bearing capacity of the bridge as a whole and improve the reuse rate of construction materials. The material utilization rate of carbon fiber plate reinforcement is much higher than that of the previous reinforcement technology, and it has a relatively good application prospect.
Carbon fiber plate reinforcement technology
When reinforced concrete structures are being reinforced, construction workers use many methods. The most common methods are pasting steel plates and prestressing reinforcement. The traditional bonding method of carbon fiber cloth has the function of restraining local cracks. Compared with steel stranded wire, carbon fiber plate has more prominent advantages. For example: light weight, high strength, corrosion resistance and fatigue resistance, etc., which can fundamentally strengthen the beam to prevent it from cracking. In addition, the carbon fiber plate can effectively resolve the shortcomings of the steel strands when reinforcing steel bars, which can enhance the bearing capacity of the bridge and reduce the construction cost.
Carbon fiber plate has many advantages. The most common advantages are high strength and corrosion resistance. It has a wide range of applications, especially in projects that are used to strengthen concrete structures. The carbon fiber plate reinforcement technology can stretch the pre-stress and anchor the carbon fiber plate in the beam member. The prestressing force can make the carbon fiber plate be stressed first, and the performance of the reinforced beam can be adjusted appropriately through the high strength advantage of carbon fiber.
Project
The location of the Tongshun River Bridge is on the Yangyue Interchange E ramp of Yue Expressway. The length of the bridge's middle body is 156m. The simple support structure is continuous. The bridge inspection found that large areas of concrete peeling off the bottom of the horseshoe of beams 1-3 and 1-5.
1) The diseases in the T beam concrete should be treated in time, and the prestressed carbon fiber plate should be stretched at the bottom of the horseshoe.
2) The shedding of concrete aggregate particles can affect the actual effect of carbon fiber plate reinforcement to a certain extent. Therefore, the loose soil layer on the surface of the concrete should be chiseled off, and the floating dust at the bottom of the beam should be blown away with a blower.
The prestress of the prestressed carbon fiber reinforcement system has not changed significantly, the bearing capacity of the bridge has been improved, and the bonding effect of the carbon fiber plate and the bottom of the T beam is good.
Concluding remarks
It can be seen that the carbon fiber plate reinforcement technology has been widely used in construction reinforcement work.
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Prestressed carbon fiber reinforced polymer(CFRP) plate for slab, beam strengthening to increase stiffness, reduce distortion and deflection of members, reduce the cracks, avoid and stop cracking.
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