How to choose the model and thickness of the floor slab?

Nowadays, floor slabs have been widely used in the renovation of high-rise buildings, factories, and old buildings. When choosing the type of floor slab, many people still cannot figure out the commonly used thickness of the floor slab. Choosing too thick profiled steel plates will naturally increase the amount of steel used; Choosing too thin profiled steel plates may result in insufficient support span and be unsafe. Today, the manufacturer of China Construction New Materials' floor slabs will take you to a detailed understanding of the selection of floor slab models and thicknesses.

1. Common thickness specifications for floor slabs

The floor support plate is made of cold-rolled steel plate (steel coil), and the commonly used specifications for steel plate thickness are: 0.75mm, 0.90mm, 1.0mm, 1.20mm, and 1.50mm. When the thickness of the steel plate is greater than 1.2mm, its forming is more difficult, mainly because the bolts cannot weld through the connection between the profiled steel plate and the steel beam. Therefore, the thickness of the floor support plate should not exceed 1.5mm. When used as a composite floor slab, the "Code" stipulates that the thickness of the steel plate should be ≥ 0.75mm.

2. What is the commonly used thickness of floor slabs

In projects, floor slab thicknesses of 0.75mm, 1.0mm, and 1.2mm are commonly used.

3. How to choose the thickness of the floor slab

The thickness of the floor slab mainly depends on the thickness of the floor slab (concrete) and the spacing between the secondary beams. This calculation has technical content and is based on relevant data such as the section modulus and section moment of inertia of the floor slab. Here, let me briefly explain the usual criteria for judgment:

Under normal circumstances, the span between steel beams should be within 2 meters, and the thickness of the floor slab should be 0.75-0.8mm; A thickness of 0.8-1.0 is sufficient for the 2-2.5m floor slab; A floor slab thickness of 1.5mm is used for spans of 3-4 meters, and temporary supports are used for spans exceeding 5m.

Of course, the above is only considered from the perspective of plate thickness, without fully taking into account factors such as plate shape and strength. Another factor that is easily overlooked is the quality of screws, which also determines the thickness of the floor slab. The better the screws, the stronger the bearing capacity of the floor slab.

The selection of bolt length needs to consider the following two aspects:

1. The height of the post weld bolt is 30MM higher than the wave height of the profiled steel plate (pay attention to selecting the type of floor slab);

2. The concrete protective layer on the top surface of the bolt should not be less than 15mm (note the total thickness of the floor slab), and the diameter should not exceed 19mm.

The types of floor slab bolts include ф 8 ф10、ф13、ф16、ф19、ф22、ф25， Studs are commonly used in steel structure buildings, particularly in column bases and floor slabs. Generally, column bases with high stiffness requirements use steel columns that extend into the concrete, and bolts are evenly distributed around the parts where the steel columns are embedded in the concrete.