CFRP strengthening reinforced concrete slabs

Project overview

The project includes 3# building, 4# building, 5# building, 6# building, 8# building, 9# building, 16# building, 17# building and underground garage. The residential buildings are 1 floors underground, 26~28 layer on the ground, shear wall structure, building height of about 85.1 meters; underground garage is 1 floors underground, frame structure, the height of 3.7 meters. The seismic fortification intensity is 7 degrees. The total building area is about 140 thousand square meters.

The engineering building design is equivalent to 0 94.40m, which is equivalent to the the Yellow Sea elevation. Shear walls are used for high-rise buildings, and tubular piles are used for foundations.

In order to facilitate the unified guidance for the construction of CFRP reinforcement, six floors and seven floors of 3# building are needed to be compiled.

The part that needs to be reinforced

The six floor structure of the reinforcement position in the 3# building is 18.560 floor elevation, the 1--17 axis turns to the A--1/M axis, the seven layer structure is elevation of the 21.660 floor, the local position on the F axis --J axis of the 5 axis --7 axis, the --K axis of the F axis on the 13 axis --14 axis, the 16 axis --17 axis to the G axis --K axis, and the 15 Axis axis.

According to the actual condition of the construction site and the reinforced concrete, the construction measures and the construction plan are worked out.

Make preparations for the carbon fiber cloth, resin and machine tools before construction.

Construction time

The preparatory work is completed in 30 days.

Cause of cast-in-place concrete floor crack 

The cracking of floor is mainly caused by surface crazing and local penetration. This kind of crack is mainly manifested in construction.

In the course of the cracks, due to the large area of surface, in the evening pouring concrete, second days in the morning to send people to water, but the front poured, behind the dry, to noon on the surface of the turtle cracks, with the naked eye can be identified.

Surface treatment

1, the deteriorated, loose, honeycomb, corrosion and bad concrete should be removed from the surface of the reinforced component, and the concrete structure should be exposed, and the surface of the surface should be repaired with the repair material.

2, we should crack or seal the cracks according to the design requirements.

3, the surface of the pasted concrete should be polished and smoothed to remove impurities such as surface floats and oil stains until the new surface of concrete structure is exposed. Stick to the lead angle angle and grinding arc shape, arc radius should not be less than 20 mm.

4, the concrete surface should be cleaned and kept dry.