Xuzhou Tongshan Prefabricated House
After fires, it is crucial to focus on inspecting the fire resistance of the joint-filling materials in prefabricated houses in Tongshan, Xuzhou. Here is a detailed analysis:
In Tongshan District, Xuzhou, for prefabricated panel-structured houses built before 2000, their architectural characteristics and material properties necessitate targeted inspections after fires. Prefabricated panel-structured houses are typically assembled from prefabricated concrete panels, with the joint-filling materials playing a vital role in the overall structural stability. Fire resistance is one of the core indicators for post-fire inspections of such houses because, under high-temperature conditions, the filling materials may undergo physical or chemical changes, leading to a decrease in their load-bearing capacity.
Typical cases indicate that carbonization of the filling materials is a key factor triggering floor collapse. A serious accident occurred in Tongshan District where a fire caused carbonization of the joint-filling materials, ultimately resulting in floor collapse. The carbonization process reduces the strength and adhesion of the materials, causing the connections between the prefabricated panels to fail and thereby threatening structural safety. Such cases demonstrate that merely inspecting whether the prefabricated panels themselves are damaged after a fire is far from sufficient; it is essential to thoroughly evaluate the fire resistance of the filling materials.
Inspections should cover the integrity, carbonization degree, and bonding state of the filling materials. Specifically, visual inspections, tapping tests, or professional instrument analyses should be used to determine whether the filling materials exhibit cracking, detachment, or powdering. If the carbonization depth exceeds the design allowance or if the material separates from the prefabricated panel interface, immediate reinforcement measures must be taken, such as refilling with fire-resistant materials or adding structural supports to prevent secondary disasters.
During routine maintenance, it is advisable to regularly inspect the durability of the joint-filling materials. Although the reference information does not mention maintenance requirements in non-fire scenarios, based on the aging patterns of materials, filling materials exposed to humid environments and temperature variations over the long term may experience a gradual decline in fire resistance. Therefore, considering the climatic characteristics of the Xuzhou area, it is recommended to conduct a professional assessment every 5-10 years to ensure that the filling materials consistently meet safety standards.
