Can Old Prefabricated Panel Houses Be Opened Up?
Whether old prefabricated panel houses can be opened up cannot be generalized; careful assessment and scientific measures are required, and they should not be opened up arbitrarily.
Whether old prefabricated panel houses can be opened up and renovated cannot be judged solely based on the type of floor slab; multiple factors need to be considered comprehensively. Construction era, structural system, construction quality, maintenance status, and professional appraisal results are key considerations. Old prefabricated panel houses built in different eras have differences in structural design and material performance. Houses built a long time ago may have more severe structural aging and higher renovation risks. The structural system determines the force-bearing mode and overall stability of the house. If the house relies on load-bearing walls to support the floor slab, the connection capacity between the floor slab and the walls, as well as between floor slabs, is limited. Arbitrarily opening up may damage the structural system and affect the safety of the house. Construction quality directly affects the sturdiness of the house. Houses with poor construction quality are more prone to problems during renovation. The maintenance status cannot be ignored either. Houses that have been poorly maintained for a long time may have issues such as wall cracks and damaged prefabricated panels, increasing the difficulty and risk of renovation. Professional appraisal results can comprehensively assess the structural safety of the house and provide a scientific basis for renovation.
Taking the reinforcement and renovation of a 30-year-old prefabricated panel house as an example, the structural team first conducts a comprehensive structural safety assessment of the old house, focusing on inspecting the crack width at the prefabricated panel production site and the connection status between the prefabricated panels and the ring beams. During the construction preparation stage, a temporary support system is erected, with steel pipe supports set every 1.2 meters along the length of the prefabricated panels, and key nodes using H-shaped steel beams for beam replacement. During demolition, the principle of starting from the middle and then moving to the sides is adopted for segmental demolition and cutting, maintaining symmetrical demolition. The daily demolition volume does not exceed 30% of the total floor area, and the stress changes in the support system are monitored in real-time during demolition. The use of heavy hammers for impact demolition is prohibited to avoid shock and damage to the foundation structure. This fully demonstrates that opening up and renovating old prefabricated panel houses requires careful handling, must undergo professional assessment, and adopt scientific and reasonable construction methods.
