Housing Construction Standard for Prefabricated Floor Slabs

The following are the regulations regarding prefabricated floor slabs in housing construction standards:

I. Scope of Application As one of the "three types of prefabricated panels," prefabricated floor slabs (including prefabricated composite floor slabs) have a clearly defined scope of application in projects:

1. Public Buildings: Newly constructed hospitals, hotels, and office buildings with a single building area exceeding 20,000 square meters, as well as newly constructed school buildings with an area exceeding 5,000 square meters, are required to use prefabricated floor slabs.
2. Residential Buildings: Newly constructed commercial residential buildings, apartments, and affordable housing must all utilize prefabricated floor slabs.
3. Industrial Buildings: Standard factory buildings with a single building area exceeding 10,000 square meters are required to use prefabricated floor slabs.

II. Engineering Requirements

1. Concrete Structure Buildings:

   • Prefabricated composite floor slabs must be used, and the combination with prefabricated exterior wall panels is encouraged to enhance the overall assembly rate.
   • The total proportion of the mandatory "three types of prefabricated panels" (prefabricated floor slabs, prefabricated exterior wall panels, and prefabricated stair panels) in a single building must not be less than 60% to ensure compliance with the core indicators of prefabricated buildings.

2. Steel Structure Buildings:

   • The quality control of floor slabs and their connection nodes must comply with the "General Technical Conditions for Prefabricated Components and Nodes in Steel Structures of Prefabricated Buildings."
   • This standard provides detailed regulations on the classification, marking, testing methods, and inspection rules for steel components, wall panels, and floor slabs, ensuring the durability and safety of prefabricated floor slabs in steel structure buildings.

III. Performance Standards The performance of prefabricated concrete floor slabs must be verified in accordance with the national standard "Performance Standards for Buildings - Performance Tests for Prefabricated Concrete Floor Slabs under Concentrated Load Conditions" (GB/T 24497-2009). This standard is equivalent to the ISO international standard ISO 9883:1993 and specifies testing methods for floor slabs under concentrated loads, covering key indicators such as crack control and deformation limits to ensure structural safety under normal use conditions.

IV. Technical Document References

1. The design and construction of concrete structure buildings should refer to the "Technical Standard for Prefabricated Concrete Buildings" (GB/T 51231-2016), which clarifies the connection details, construction techniques, and acceptance requirements for prefabricated floor slabs.
2. In steel structure buildings, the connection nodes between floor slabs and steel beams must comply with the "Steel Structure Design Standard" (GB 50017-2017) to ensure the load-bearing capacity and seismic performance of the nodes.

These standards collectively establish a comprehensive regulatory framework for prefabricated floor slabs, covering the entire process from design and production to construction, providing technical support for enhancing the level of building industrialization and ensuring project quality.