In the construction of bridges, the engineering scale of concrete is getting larger and larger, and the structural form is more and more complicated, but the crack phenomenon is often a major research topic in the construction of large-volume concrete structures.
When cracking occurs in the construction of the bridge, firstly, it is necessary to appropriately increase the height of the end section, and the bearing horizontal force steel bars, radial reinforcing bars or curved structural bars (the bending direction is equal to the main tensile stress) should be configurated. Decreasing the bending angle of the prestressing tendons and reducing the non-preloading zone; the supporting nodes adopt micro-motion connection, such as bolting, rubber gaskets and flexible joints in the reserved holes to reduce the restraining stress; In addition, there should be a long stacking time before the components are hoisted. The final fixing of the crane beam is as late as possible (the creep can reach 60% in 3 months, the basic stability in 4 months, and 70%-80% creep in half year). To make the creep deformation complete before lifting (or before fixing), the concrete has a longer age and higher strength; the prestressed concrete members should not be prematurely released to reduce the shrinkage and deformation, and improve the resistance. Cracking ability; increase the end support pad, improve the pressure distribution layer, reduce stress concentration.
In addition, carbon fiber cloth and filling glue epoxy can be used for combination reinforcement. The carbon fiber cloth produced by Mankate can be constructed underwater, and even if the hole is wet and leaking, it can be safely constructed without being affected. It is suitable for tensile, shear and seismic strengthening and reinforcement of civil engineering, bridges, tunnels and concrete structures. Mankate filling glue epoxy is a two-component material containing including two components, A and B, with a weight ratio of 3:1, low viscosity, strong penetrability. It can be injected into 0.1mm micro-cracks, and it has strong anti-aging damp heat, acid and alkali resistance. Both of these products are suitable for X-crack reinforcement of bridges. If you are interested in the bridge concrete crack repair products, please call our one-stop service hotline: 400-894-5118.
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