What is the national standard of cast-in-place floor slab?

The Code for Thickness of Cast-in-place Floor Slabs stipulates that the thickness of the floor slab shall not be less than 80MM, and a beam shall be added in the middle of the cast-in-place floor slab with the thickness of 120MM.

The national standard is mostly 80- 160mm.

The thickness of cast-in-place floor depends on the floor size and reinforcement at the location. According to the design requirements, the floor thickness of general civil residence is 80- 160mm according to the purpose, bay size, reinforcement and concrete strength. If it's thicker, you need to add beams, otherwise it's too heavy. The appropriate thickness is calculated by the designer, and the allowable error is-5 mm ~+8 mm.

Extended data

Specific classification

First, the floor:

1. One-way slab: the ratio of the long side to the short side of slab is greater than 2, and the steel bars in slab are arranged along the short side direction, and the long side of slab bears the load of slab.

2. Two-way slab: the ratio of the long side to the short side of the slab is not more than 2, the load is transmitted in both directions, the internal force in the short side direction is large, and the internal force in the long side direction is small, and the main stress rib is placed below parallel to the short side.

3. The plate thickness is generally less than 120mm, and the economic span is less than 3000mm.

4, suitable for small-span rooms, such as corridors, bathrooms, kitchens.

2. Ribbed floor: there are beams in the floor, and the beams have main beams and secondary beams. The main beam is arranged along the room, and the secondary beam generally intersects the main beam vertically. The floor is placed on the secondary beam, the secondary beam is placed on the main beam, and the main beam is placed on the wall or column. Therefore, the load in the slab is transferred to the wall or column through the beam, which is suitable for large rooms such as factory buildings.

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