Building strengthening method

Abstract

The invention discloses a building strengthening method, which comprises the following steps of: 1) clearing the surface of a structure to be strengthened to expose a hard part; 2) carrying out water spray wetting on the structure to be strengthened; 3) implanting pins connecting a reinforcing steel bar net and the structure to be strengthened, and bonding the reinforcing steel bar net; 4) spraying an interface agent coating on the surface of the structure to be strengthened; and 5) spraying a polymer modified cement mortar bond layer and a polymer modified cement mortar protective layer by layers on the interface agent coating. The method can effectively improve the bearing capacity of the structure to be strengthened, improves the rigidity of the structure to be strengthened, and has less occupied space; a molded surface strengthening structure and the structure to be strengthened have the advantages of reliable bond, compactness, no crack, waterproofing, permeability resistance, fireproofing, high-temperature resistance, Cl-corrosion resistance, carbonization prevention, rust resistance and good durability; and a construction process is simple, formworks are not needed to be built, the speed of improving the strength of polymer modified cement mortar is high, and a construction period is greatly shortened. The method can be simultaneously applied to repairing and strengthening of the existing concrete structures and masonry structures, and solves the problems of breakage and aging of materials and insufficient structural strength of an old building.

Description

technical field [0001] The invention relates to a reinforcing method for repairing and reinforcing building concrete or masonry structures. Background technique [0002] The reinforcement methods for concrete structures mainly include the reinforcement method of adding components, the reinforcement method of enlarging the section, the reinforcement method of sticking steel, the reinforcement method of pasting carbon fiber cloth, and the steel strand mesh-polymer modified cement mortar surface layer method, etc. By using the above method, the bearing capacity of the concrete structure can be improved, but there are the following defects: [0003] 1) The construction period of the reinforcement method of adding components is long, and the additional components affect the usable space; [0004] 2) When using the method of strengthening the cross-section, the self-weight and geometric dimensions of the components after reinforcement will increase, which will affect the aestheti...

AI Technical Summary

Problems solved by technology

[0003] 1) The construction period of the reinforcement method of adding components is long, and the additional components affect the usable space;

[0004] 2) When using the method of strengthening the cross-section, the self-weight and geometric dimensions of the components after reinforcement will increase, which will affect the aesthetics and usable space of the building. Formwork needs to be erected, and the construction period will be long;

[0005] 3) The bonded steel reinforcement method requires strict fire prevention and antirust treatment after reinforcement, and regular maintenance is required, and the later maintenance costs are high;

[0006] 4) The reinforcement method of sticking carbon fiber cloth does not increase the size of the component, but because epoxy resin is used as the base material for carbon fiber cloth reinforcement, its durability and fire resistance are poor, and on the other hand, the material price of carbon fiber is also high;

[0007] 5) Although the steel strand mesh-polymer modified cement mortar surface layer method has better fire resistance than carbon fiber cloth reinforcement, the cost of steel strand materials is high, the construction of steel strand mesh is complicated, and the overall cost is high

[0009] 1) The bearing capacity that can be improved by repairing and grouting is limited;

[0010] 2) The traditional cement mortar surface layer is easy to bulge and crack, and there are also problems of water seepage and water leakage for masonry in a wet environment;

[0011] 3) The use of additional columns, supports and brackets, and corner trimming, etc., has a long construction period and affects the usable space

Local reinforcement cannot solve the problems of aging and damage of the load-bearing wall of the original structure

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