How to Remove Prefabricated House Slabs

The removal of prefabricated house slabs must strictly adhere to safety regulations and legal procedures, with specific steps outlined as follows:

I. Core Preparations Before Removal

1. Safety Assessment and Plan Formulation It is necessary to entrust a professional institution to conduct a structural stability assessment of the prefabricated slab house, focusing on inspecting issues such as material aging, cracks, and deformation, and clarifying whether there are safety hazards such as insufficient seismic performance. Based on the assessment results, formulate a removal plan that specifies the removal sequence (e.g., removing layer by layer from the top down), construction methods (mechanical removal or manual removal), equipment requirements (such as cranes and breakers), and personnel allocation, while also planning environmental protection measures such as dust control and noise protection.

2. Legal Approval and Resident Consultation Submit a removal application to the local construction authorities, attaching the safety assessment report, removal plan, and emergency response plan. Construction can only commence after obtaining approval. If it involves residential buildings, it is necessary to publicly announce the removal plan in advance and negotiate compensation plans (such as monetary compensation, housing replacement, or temporary relocation allowances) to ensure that residents' rights and interests are protected by law.

II. Key Operations During the Removal Process

1. On-site Safety Control Set up fences and warning signs around the removal area to prohibit unauthorized personnel from entering. Take measures such as protective nets and scaffolding reinforcement for the retained parts (such as adjacent buildings). Arrange for dedicated personnel to monitor the construction process, focusing on preventing risks such as the falling of prefabricated slabs and structural collapse, and immediately stop work for rectification if any hazards are found.

2. Step-by-step Removal Implementation

   • Support and Reinforcement: Provide temporary support for walls or structures that need to be retained to prevent instability during removal.
   • Cutting and Separation: Use tools such as water jet cutting or diamond wire saws to disconnect the prefabricated slabs from the beams and columns, reducing the impact of vibration on the overall structure.
   • Segmented Lifting and Transportation: Lift the prefabricated slabs in sections away using a crane to avoid the impact force generated by overall toppling; if space is limited, manual crushing followed by batch clearance can be adopted.
   • Cleaning and Acceptance: After removal, inspect the site and clear away any remaining components to ensure there are no safety hazards.

III. Considerations for Removal Decision-making

1. Structural Safety: If a house is identified as a dangerous building (such as a Class D dangerous building) and the repair cost exceeds 70% of the reconstruction cost, the local government can organize its removal in accordance with the law.
2. Urban Planning Needs: When a house is located in an urban renewal area (such as old city renovation or transportation hub construction), it needs to be removed according to planning requirements, and new project construction should be advanced simultaneously.
3. Renovation Policy Priority: For prefabricated slab houses with still-viable structures, priority should be given to improving their usability and extending their lifespan through old residential community renovations (such as elevator installation and pipeline replacement).

Removal work must prioritize safety while taking into account legal compliance and residents' rights and interests, ensuring a controllable process and reliable results.