How to reinforce 12 thick cast-in-place floor slab

12 thick cast-in-place floor slab reinforcement method;

1, the plate thickness is generally 120, 140, 160, 180 or 120, 150, 180. Try to use secondary steel, including secondary steel with a diameter of φ 10, and reinforced bar with a diameter of ≥ 12. In addition to the hook, the main reinforcement shall not be used.

2, steel bar should be large diameter, large spacing, but the spacing is not more than 200, spacing with 200 as far as possible.

3. (Generally, the cracks in the plate with a span of less than 6.6m can meet the requirements) The steel bars on the upper part of the plate with a span of less than 2m need not be disconnected, and the steel bars can be omitted, which only means that the steel bars are bidirectional and double-row φ8*200.

4. The spacing between upper and lower steel bars on the plate should be equal, and the diameters can be different, but the types of steel bar diameters should not be too many.

5. Considering that the reinforcement of the top anti-crack plate can be continuously or 50% connected, the larger additional reinforcement and pull-through reinforcement should overlap the reinforcement according to the tension. When the plate reinforcement is the same, just mark the version number.

Extended data:

Treatment of cracks in cast-in-place slab;

A, resin perfusion method

1, epoxy resin is the most common crack grouting material, which has high mechanical strength and can resist most chemical corrosion encountered by concrete, and the resin can be poured into cracks of 0.05㎜.

2. Except for some special epoxy resin, when the cracks are mobile, leaking, not dry, or the number of cracks is particularly large, it is usually not appropriate to use resin perfusion method.

Second, the nail method

1, nail method is more suitable when the tensile strength of the main crack section needs to be restored. It is especially suitable for locking movable cracks without damaging surrounding structures.

2. Use a relatively slender metal "seam U-shaped nail" to insert it into the pre-opened groove through the crack and fix it with non-shrinkage mortar or epoxy resin-based adhesive.

Third, the surface sealing method

It is used to repair static cracks that have little influence on the structure, and to prevent the invasion of water vapor, chemicals and carbon dioxide by sealing the cracks.

Fourth, grouting method

1, cracks in the rock foundation of dams, thick concrete walls or hydraulic structures by ordinary cement grouting are sometimes closed by injecting silicate cement mortar.

2. The polymer is injected into the grouting material which is mainly urethane or acrylamide polymer, and reacts with water to form solid precipitate or foam, which plays a role in sealing cracks. Can be used in humid environment.