Looking at the bridges across the rivers and mountains, everyone will become admirable for the engineering people. Indeed the bridge has brought great convenience to our transportation. But because the bridges are generally far from the ground, once it collapses, the damage is often more serious than the ground collapse. After long-term use of bridges, there are often a series of problems. The most common ones are cracks. How do the cracks appear on the bridge? Just look for building carbon fiber carbon cloth to help!
Why are there cracks in the bridge?
I. Analysis of temperature cracks in bridges
1. External causes: sunshine; sudden cooling.
2. Internal reasons: The common causes of temperature cracks in construction are as follows:
(1) Basic constraints. Under the action of atmospheric temperature and its hydration heat temperature, the internal temperature of concrete is very large. When the concrete shrinkage due to cooling is constrained by rock foundation or old concrete cushion, large tensile stress will appear inside the concrete. And a constrained crack occurs. Being constrained by hard bedrock and old concrete is the main cause of severe cracks in mass concrete.
(2) The bedrock is not flat. After the concrete is poured, the internal temperature is high, and the bedrock is restrained by the bedrock during the cooling process. If there is a sudden change in the surface of the bedrock, it is easy to form stress concentration and cracks at the place.
How to strengthen the cracks in the bridge?
1. In the crack repair, the filling method is a relatively common construction method, which is a method suitable for repairing wide cracks (0.5 mm or more).
2. Building carbon fiber carbon cloth reinforcement method The construction carbon fiber carbon cloth reinforcement method is widely concerned by the civil engineering industry because of its high strength, light weight, corrosion resistance and simple construction. It is a construction method with great development potential.
1) The tensile strength and elastic modulus of the building carbon fiber carbon cloth have the same superior characteristics as the steel, which can meet the bearing capacity requirements.
2) The carbon fiber carbon cloth of the building is only one-fifth of the weight of the steel, easy to handle, not restricted by the narrowness of the construction site, and has good operability.
3) Construction carbon fiber carbon cloth is corrosion-resistant and rust-free, and has good protection effect on concrete structures affected by salt damage and corrosive substances.
What are the construction processes for building carbon fiber carbon cloth reinforcement?
Adhere to the structure to be reinforced by the epoxy resin adhesive along the tension direction or perpendicular to the crack direction to form a new composite body, so that the reinforcing patch and the original reinforced concrete are combined to increase the structural resistance. Pull or shear resistance to increase strength, stiffness, crack resistance and structural ductility.
The bridge makes the distance closer, but cracks will make the danger closer. Mankate building carbon fiber carbon cloth protects the bridge, makes the bridge wider, makes the bridge longer, and lets the bridge say goodbye to cracks! If you need it, please feel free to contact Mankate's one-stop service hotline: 400-894-5118
Mankate's carbon fiber carbon cloth was broadcasted by CCTV brand
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(Editor: Nanjing Mankate, if you need to reprint, please indicate the source)
