How to deal with prefabricated commercial housing in Beilun District of Ningbo in 222?

for prefabricated houses, different methods will be adopted, and there will be no one-size-fits-all approach. It will not be said that as long as it is a prefabricated house, it will all be demolished. It depends on local conditions and the specific situation of the house.

Precast slab is the floor slab used in early 2th century buildings, which is the module or plate used in engineering. Because the precast concrete is produced and processed in the precast yard, it is directly transported to the construction site for installation, so it is called precast slab. When making precast slabs, the hollow model is nailed with wooden boards first, and then the hollow part of the model is filled with cement after being laid with steel bars. When it is dry, the wooden boards are knocked off, and the rest is the precast slab. Precast slabs are used in many buildings, such as cement slabs covered in ditches next to highways; The cement slabs used as heat insulation layers on the roof are prefabricated slabs. Nowadays, this method has been eliminated in housing construction, and it has been changed into frame structure and reinforced concrete structure, and the safety and quality have been further improved. The size of precast slab includes the following contents:

1. Span: the longest for residential use is 4.2 meters, regardless of modulus, which exceeds the need for customization;

2. width: 5mm and 6mm at most;

3. thickness: common 12mm, 15mm；;

4. Grade of bearing live load: Generally, two grades of boards can be used for residential buildings, namely the first-class board and the second-class board. The first-class board means that it can bear live load of 1KN/M2, and the second-class board can bear live load of 2KN/M2. Southwest China has stipulated that the minimum is four-level slab, that is, the live load it can bear is 4KN/M2.