Removal of Prefabricated Slabs in Two-Story Houses

The removal of prefabricated slabs in two-story houses must strictly adhere to safety regulations and be carried out in three stages: preparation before removal, standardization during the removal process, and wrap-up work. If the house is classified as a D-grade dilapidated building, professional assessment conclusions shall prevail.

Preparation Before Removal:

1. Structural Safety Assessment: It is essential to commission a professional team to conduct a safety assessment of the overall structure of the house, focusing on confirming the connection status between the prefabricated slabs and the load-bearing structure, as well as the stability of the building, to determine whether it meets the conditions for removal. If the house has been identified as a D-grade dilapidated building (where the load-bearing structure can no longer meet safe usage requirements), it should be prioritized for removal and renovation. However, the final decision must be based on the assessment report issued by a professional institution.
2. On-Site Safety Isolation: Before removal, water, electricity, and gas supplies must be cut off to prevent secondary disasters caused by construction. Iron sheet fences with a height of no less than 1.8 meters should be set up around the work area, and warning signs such as 'Construction Danger' and 'No Entry' should be hung to prevent unauthorized personnel from entering.

Standardization During the Removal Process:

1. Personal Protective Equipment Requirements: All construction personnel must wear safety helmets and non-slip safety shoes. When working at heights, they must wear safety harnesses and ensure that the anchor points are secure. If there is a significant amount of dust during the removal process (such as from concrete fragmentation), additional gas masks or dust masks should be worn to reduce the risk of inhalation injuries.
2. Removal Sequence Principles: The sequence must follow the principle of 'from top to bottom, non-load-bearing before load-bearing'. First, remove non-load-bearing structures such as partition walls and doors and windows, then gradually remove the prefabricated slabs. When removing the prefabricated slabs, steel frames or temporary support structures should be used to fix both ends of the slab to prevent collapse due to uneven local stress. Finally, remove major load-bearing components such as beams.
3. Tool and Equipment Usage: Priority should be given to using low-vibration tools such as hydraulic breakers and pneumatic picks to reduce the impact on surrounding structures. If large machinery (such as excavators) is required, ensure that there is sufficient operating space and that it is directed by professional personnel to avoid the mechanical arm colliding with unremoved parts.

Wrap-Up Work: After removal, construction waste such as concrete fragments and steel bars should be sorted and cleaned up. It should be transported to designated disposal sites using covered trucks, and random dumping or stacking in public areas is strictly prohibited. During transportation, dust screens should be used to prevent dust pollution to the environment. If the removed area is to be rebuilt subsequently, the foundation should be leveled, and relevant structural drawings should be retained for reference in subsequent construction.