Requirements for Demolition of Prefabricated Floor Slabs in Houses

The demolition of houses with prefabricated floor slabs must be based on policy regulations and safety assessments, with strictly defined conditions and standardized implementation procedures. The core requirements are as follows:

I. Policy Orientation: Focus on Renovation and Transformation, Not Comprehensive Demolition

According to the "15th Five-Year Plan for Urban Renewal" and joint notices from multiple departments, the management of prefabricated slab houses emphasizes "steady progress" and explicitly prohibits "one-size-fits-all" demolition. Policy provisions include:

• Renovation Goals: Prioritize the renovation of over 500,000 C- and D-grade dangerous houses and non-complete housing units. The total floor area to be demolished should not exceed 20% of the current total floor area, with a demolition-to-construction ratio not exceeding 2.
• Demolition Scope: Only two types of houses may be demolished:
  • D-grade dangerous houses: Those with failed load-bearing structures and significant safety hazards, requiring "demolition where necessary".
  • Old buildings that do not comply with urban planning or functional requirements: Such as prefabricated slab houses that obstruct urban functional layouts or are incompatible with the surrounding environment. Key Point: Most prefabricated slab houses will be reinforced or renovated to improve safety rather than being directly demolished.

II. Demolition Conditions: Based Solely on Safety Assessments

Whether a house should be demolished must be determined through professional assessments conducted in accordance with the "Standard for Dangerous House Assessment" (JGJ 125-2016). The assessment results are classified into four grades:

• Grade A: Structurally safe, no demolition required.
• Grade B: Individual components have issues, generally safe.
• Grade C: Local load-bearing structures have failed, requiring reinforcement or partial renovation.
• Grade D: Overall load-bearing structures have failed, requiring mandatory demolition. Economic Considerations: The cost of reinforcing a D-grade dangerous house often exceeds 50% of the cost of new construction, making it economically unfeasible. Therefore, priority is given to demolition. C-grade dangerous houses are addressed through reinforcement, renovation, or reconstruction.

III. Demolition Implementation Requirements

1. Compliance Requirements

   • The construction unit must possess professional contracting qualifications for blasting and demolition. Subcontracting of the entire project is strictly prohibited.
   • Before construction, a safety production management agreement must be signed, clearly defining the responsibilities of the construction, supervision, and development units.
   • The development unit must provide demolition engineering drawings, underground pipeline distribution maps, and other relevant information, and cut off pipelines affecting construction.

2. Safety Technical Specifications Refer to the "Technical Code for Safety in Building Demolition Engineering" (JGJ***—2004). Demolition methods include:

   • Manual Demolition: Suitable for small or complex structures.
   • Mechanical Demolition: Requires control of noise and dust.
   • Blasting Demolition: Requires strict approval to ensure the safety of the surrounding area.
   • Static Crushing: Reduces vibration and is suitable for specific concrete structures.

3. Resident Relocation and Rights Protection After the demolition of D-grade dangerous houses, residents are typically provided with housing through expropriation and relocation or original-site reconstruction. The demolition ratio is limited (not exceeding 20%), and most houses will be improved in safety through renovation and transformation.

Summary: The demolition of prefabricated slab houses must meet the conditions of being assessed as Grade D for safety or non-compliance with urban planning. It must be carried out by qualified units, strictly adhering to safety specifications, and with a clear resident relocation plan in advance to avoid "one-size-fits-all" demolition.