Bridge can be said to be a connected lifeline. If the bridge cracks are very dangerous, it is related to the safety of vehicles and personnel. How to deal with bridge cracks?
For the cracks that do not affect the bridge structure, the following three methods are generally used. This method is suitable for narrow joints and is used to restore the appearance and positive durability of components.
Fill method. When the cracks are wide, the concrete surface can be chiseled into V-shaped or U-shaped grooves along the cracks, filled with resin mortar data, or cement mortar or asphalt data. Injection method. When the crack width is small and the crack is deep, the repair method can be used to inject the repair information into the concrete. The first crack is provided with injection pipe, the rest parts are sealed by surface treatment, the data injection is made of low viscosity epoxy resin, and the repair is made by electric pump or manual pump.
What if the cracks affect the safety of the structure? That is, around a set of reinforcement methods. According to the permission of surrounding standards, crb551 steel mesh is wrapped on one or more sides of the external side of the structure to increase the bearing capacity of reinforcement and section forward; if the crack is serious, and there is no crack or split on one side, the protective layer of reinforcement shall be cut off at the crack and a layer of crb551 steel mesh shall be added. The foundation of large equipment is generally treated by adding steel hoop and increasing ring tensile strength.
Maybe insert it. The steel plate or section steel is bonded to the concrete crack surface of the component by the modified epoxy resin and binder, so that the steel plate or section steel is connected with the concrete. Before bonding, the surface of crb551 steel mesh shall be derusted by sand blasting, the concrete drawing shall be clean and monotonous, and the thickness of bonding layer shall be 1 ~ 4mm.