1. working principle

Increasing the cross-section reinforcement method is a traditional reinforcement method, by increasing the cross-sectional size of the original structural members and adding the required reinforcement to the original structure together, the strength and rigidity of the members are increased, which is suitable for the beams, slabs, walls, column member reinforcement.

(Increase the section reinforcement)

2. Construction characteristics and requirements

Increasing the cross-section reinforcement method for the traditional reinforcement construction method, the main method is applied to the beam stiffness, bending or shear capacity and the difference between the larger enough difference or the original column strength or stiffness of the reinforcement. Its main features and related requirements are:

(1)strengthening with steel rebar, processing and surface treatment process is a large number of projects.

(2)large amount of on-site traffic, wet workload, high labor intensity.

(3)can give full play to the overall performance of steel and concrete, reinforcing effect is good.

(4)concrete hardening for a long time, long-term conservation.

(5)this method does not apply to plain concrete components, the original component concrete strength grade should not be lower than C10.

3. Increase the section reinforcement construction technology

(1) Measuring payoff according to the design drawing requirements, the concrete beam should be tested to increase the section size, and the layout of the planting bar on the beam and the location of the main reinforcement.

(2) Steel surface treatment Grinding rust removal, and then wipe clean cotton wool with acetone.

(3) Surface Treatment of Concrete Base The old and new bonded surfaces of the original concrete members shall be cut and chipped, and then the dust shall be removed with oil-free compressed air or rinsed with clean water. According to the drawing requirements, the protective layer should be removed from the surface of the concrete. Substrate pay-off reinforcement bar material, rust concrete base ticking, clearing planting holes, clean planting bar reinforcement connection, lashing set template pouring concrete conservation

(4) Drilling planting rebar According to the location of the new longitudinal bar, use the hammer drill to drill the hole, injecting the anchorage glue into the rebar after the clearance hole treatment, and the depth of anchorage should be in strict accordance with the design drawings; the stirrups, Longitudinal reinforced steel.

(5) Insert reinforcement banding, template support and concrete pouring.