Demolition Plan for Prefabricated Floor Slab Houses

The demolition of prefabricated floor slab houses requires a combination of preliminary preparations, formal demolition operations, and policy handling principles. The specific plan is as follows:

I. Preliminary Preparations

1. Data Collection: Comprehensively grasp basic information about the residential area to be demolished, including the number of buildings, building structures, construction years, total floor area, number of residents and businesses, and distribution of underground pipelines. Focus on recording key data such as the splicing direction of prefabricated floor slabs, locations of load-bearing walls, and the number of exterior wall cantilevered components to provide structural safety references for demolition operations.
2. Personnel and Material Preparations: Establish an on-site command center with workgroups for coordination, safety control, demolition operations, emergency response, and logistical support. Deploy certified demolition personnel, safety supervisors, and emergency rescue personnel. Prepare equipment such as hydraulic breakers, watering trucks, mist cannons, dust screens, emergency medical kits, firefighting equipment, and hard isolation barriers to ensure operational safety and environmental compliance.
3. Pre-notification and Site Clearance Verification: Post demolition notices at the entrances and exits of the residential area and on bulletin boards 15 days in advance. Distribute notices to each household, specifying the clearance deadline, operation cycle, and detour routes. After clearance, verify the cancellation of water, electricity, and gas services for each household, ensure no personnel or valuable items remain, and coordinate with utility companies to complete relocations or service interruptions for protection, avoiding construction risks.

II. Formal Demolition Operations

1. Pre-treatment Operations: Remove附属构件 (affiliated components such as air conditioning units, security grilles, and cantilevered advertisements) from the exterior facades of the buildings. Seal all entrance doors and unit doors. Set up 2.5-meter-high enclosed barriers around the operation area, equipped with safety warning signs and night warning lights. Arrange security personnel for 24-hour guard duty to prevent unauthorized access.
2. Main Demolition Operations: Follow the principle of "top-down, outside-in," prioritizing the use of hydraulic breakers for layer-by-layer demolition. Prohibit the use of push-over or excavation-style demolition methods. After each layer is broken, promptly water the area to suppress dust, and deploy mist cannons alongside each piece of equipment for simultaneous operation. When demolishing down to the last two floors above ground level, adjust the breaking direction to direct construction debris to fall within the residential area's internal grounds, minimizing impact on the surrounding environment.
3. Construction Debris Removal: After the main demolition is completed, promptly remove construction debris to avoid accumulation that could affect subsequent construction or surrounding safety.

III. Policy Basis and Handling Principles

1. Scope of Demolition: Primarily targets prefabricated houses identified as Grade D dangerous buildings (with severely damaged load-bearing structures posing an imminent risk of collapse) or those with major safety hazards that cannot be eliminated through renovation (such as extremely poor flood and earthquake resistance).
2. Non-comprehensive Demolition: Policies emphasize "governance and renovation" rather than "comprehensive demolition." For example, the "15th Five-Year Plan for Urban Renewal" stipulates that the demolished floor area should not exceed 20% of the current total floor area in principle, and the project demolition-to-construction ratio should not exceed 2.
3. Tiered Handling: Determine handling methods based on the building safety appraisal report (classified into Grades A, B, C, and D according to the "Standards for Appraisal of Dangerous Buildings"). Grade D dangerous buildings should be "completely demolished," while Grade C dangerous buildings can be handled through repair and reinforcement, reconstruction, renovation, or original-site reconstruction methods.