Reconstruction and reinforcement of QingdaoThere are many reinforcement methods in the project, let’s talk about them in detail belowQingdao bonded steel reinforcementlaw. Externally bonded steel (angle steel or channel steel) is a reinforcement method that uses modified epoxy resin pouring glue to bond the steel and the original component, so that the two can be bonded into a whole and work together under force. The external bonding steel reinforcement method is suitable for the reinforcement of reinforced concrete beams and columns that need to greatly improve the section bearing capacity and seismic resistance. (1) When adopting the external bonding steel reinforcement method, angle steel should be preferably used; the thickness of the angle steel should not be less than 5mm, the side length of the angle steel should not be less than 50mm for beams and trusses, and should not be less than 75mm for columns. (2) Both the hoop plate and the trim plate should be welded with the reinforcing angle steel before gluing. The cross-section of the hoop plate or plaque should not be less than 40mmx4mm, and the spacing should not be greater than 20r (r is the small turning radius of a single angle steel section), and should not be greater than 500mm. In the joint area, 200mm should be used; There should be reliable connections and anchors at both ends.
After passing the inspection and repair, temporarily fix both ends of the struts with bolts, and then fill them with epoxy mortar or high-strength cement mortar. The reinforced strut limbs, connecting plates, affixed plates and tension bolts should be painted with anti-rust paint Carry out anti-corrosion. The carbon fiber is glued to the corresponding external part of the concrete member whose strength does not meet the force requirement by using the supporting resin. The external reinforcement method of the member with carbon fiber is based on the force analysis and calculation results and the force characteristics of the structural member. In order to achieve a reinforcement method for components to meet the requirements of bearing capacity. The reinforcement principle is to use the shear strength of the supporting resin to transfer the load carried by the concrete component to the carbon fiber, so that the post-bonded carbon fiber and the original reinforced concrete component can bear the load force together. Relying on the carbon fiber sheet itself cannot give full play to its strong mechanical properties and superior durability performance, only the carbon fiber sheet is adhered to the surface of the reinforced concrete structure through epoxy resin and tightly combined with it to form a whole work together. The foundation pit supports Therefore, protection can achieve the purpose of reinforcement.
