Concrete reinforcement method

Replacement concrete reinforcement replacement concrete reinforcement method is a very dangerous construction process, therefore strengthening the construction before the construction safety assessment. If the construction impact on the stress of the structure or component or security, dealing with the structure or component in calculating the load state of the whole construction process, in order to formulate the reasonable construction scheme. For components affecting the safety of the structure should have special monitoring plans and emergency response measures. Concrete beam reinforcement method is to use a larger structures section area, and to improve its bearing capacity satisfy the normal use of the traditional strengthening methods, strengthening effect is good, the economy, widely applicable, but the construction is complicated, wet operation workload big, long construction period, the house is clear and beautiful and also have certain influence, the original component level should not be less than C10 concrete surface reinforcement methods to repair the damaged parts of the main method is as follows (1) surface treatment: according to different damage phenomena and repair method, respectively adopt cut wool, gouge, remove damaged concrete method. Removal of damaged concrete, but also according to the extent of damage and parts, choose different artificial chiseled in addition, combined with pneumatic pick chisel deferrization, small blasting combined with artificial chisel, drill hole artificial wedge chisel or cut in addition to the mechanical cutting method. : (2) repair method for damaged concrete surface cracks, use the following methods: surface closed repair method using concrete surface micro cracks or mesh independent of capillarity absorption of low viscosity and good permeability closed fracture crack repair glue, closed fluid channel, the durability of the structure. The structure of seepage control requirements, should also be stickup on crack on the surface of glass fiber cloth ( GF cloth) Or carbon fiber cloth, CF cloth) To enhance the reinforcement method of sealing protection effect of concrete pillars outsourcing steel reinforcement method is to the problem of lack of longitudinal reinforcement concrete column can be adopted by the improved section bearing capacity and aseismic capacity of a reinforcement method. Outsourcing steel reinforced concrete column indicated as shown in the figure below: reinforcement design and structural requirements: 1. Reinforcement of Angle steel thickness should not be less than 5 mm, Angle of the side length of column should not be less than 75 mm. 2. Flat steel hoop board or batten plate should be not less than 40 mm x 4 mm, the spacing should be not more than 20 r ( R for single Angle section, the minimum radius of gyration) , and should not be greater than 500 mm; In the node area, the spacing should be proper encryption. 3. If is seriously damaged, the original column reinforcement should not continue to carry negligible column, full load borne by steel skeleton. To sum up, the above method can well improve the vertical bearing capacity of reinforced concrete columns, but also should be taken into account when choosing the reinforcement method the safety of structures, construction conditions, the use of space and durability requirements, in order to formulate the optimal reinforced concrete column method. Concrete beam reinforcement method is suitable for the need to improve the shear bearing capacity of the concrete beam section and the member ductility of reinforced concrete column reinforcement as a whole. Carbon fiber CFRP reinforced concrete column, can make the concrete subject to axial stress into three stress, constraints on bearing capacity and deformation of concrete was improved, especially on the axial compression ratio can not meet the requirement of the seismic design code of reinforced concrete column reinforcement effect is obvious. Strengthening experience suggests: a carbon fiber and, when necessary to form a complete set resin bonding material field sampling inspection. B, carbon fiber sheet actual paste area should be no less than the design flow, the position deviation should be no greater than 10 mm. C the bonding quality between carbon fiber and concrete, can use small hammer knock gently or hand pressure method to check on the surface of the carbon fiber sheet, the total effective bonding area should not be less than 95%. D, its shortcomings: organic adhesive high temperature resistant performance is poor, environment of high temperature and high building fire rating requirement cannot use; Irregular or large cross-section rectangular column should have conditions of use.