Building reinforcement and maintenance 3

reinforcement method

1. The reinforcement of concrete structures can be divided into two categories: direct reinforcement and indirect reinforcement:

The general methods for direct reinforcement include:

(1) Increase cross-sectional reinforcement method. This method has a simple construction process, strong adaptability, and mature design and construction experience; Suitable for reinforcing concrete structures of beams, slabs, columns, walls, and general structures; But the wet operation time of on-site construction is long, which has a certain impact on production and life, and the net clearance of the reinforced building is reduced to a certain extent.

(2) Replacement concrete reinforcement method. The advantages of this method are similar to those of the enlarged section method, and the reinforcement does not affect the clearance of the building, but it also has the disadvantage of long wet operation time during construction; Suitable for reinforcing concrete load-bearing components such as beams and columns with low concrete strength or serious defects in the compression zone.

(3) There is a bonded outer steel reinforcement method. This method, also known as wet external steel reinforcement method, is reliable in stress, easy to construct, and has a small on-site workload. However, it requires a large amount of steel and is not suitable for use in high temperature places above 60 ℃ without protection; Suitable for reinforcing concrete structures that do not allow a significant increase in the cross-sectional size of the original components, but require a significant improvement in their load-bearing capacity.

(4) Adhesive steel plate reinforcement method. This method has fast construction, no on-site wet work or only a small amount of wet work such as plastering, with little impact on production and life. After reinforcement, it has no significant impact on the appearance and original clearance of the original structure, but the reinforcement effect largely depends on the bonding process and operation level; Suitable for reinforcing bending or tensile components that are subjected to static forces and are in a normal humidity environment.

(5) Adhesive fiber reinforced plastic reinforcement method. This method not only has the advantages of pasting steel plates, but also has the advantages of corrosion resistance, moisture resistance, almost no increase in structural weight, durability, and low maintenance costs. However, it requires specialized fire protection treatment and is suitable for concrete structural components and general structures with various stress properties.