Xuzhou Brick-Concrete Prefabricated Panel Houses
Xuzhou brick-concrete prefabricated panel houses are mainly concentrated in older urban areas within the second ring road, such as Jianguo Community and Railway Community, which were built earlier, as well as in large numbers in the urban-rural fringe and townships of Feng County, mostly constructed in the 1980s and 1990s.
Structural Characteristics and Construction Methods
These houses use brick walls or columns as vertical load-bearing components, with prefabricated concrete floor slabs or roof panels as horizontal load-bearing components. During construction, longitudinal or transverse load-bearing walls are first built (some are "pure brick wall-column" structures). After reserving lap slots at the top of the walls, prefabricated hollow or solid concrete panels are hoisted into place. The lap length at both ends of the panels is approximately 10 centimeters, and the panel joints are filled with cement grout. This structure relies on wall load-bearing, has poor integrity and weak seismic performance, and the panel joints are prone to cracking and leaking, with poor sound insulation and thermal insulation effects.
Current Usage and Typical Issues
There are still a large number of brick-concrete prefabricated panel houses in the urban-rural fringe and townships of Feng County, Xuzhou. Some of them require systematic inspection and reinforcement due to issues such as foundation settlement and wall cracks. For example, approximately 30% of the old houses in townships such as Shouxian Town and Zhaozhuang Town have floor slab cracks or load-bearing wall deformations. If these houses lack long-term maintenance and repair, structural deterioration may accelerate, affecting living safety.
Lifespan and Maintenance Requirements
The designed service life of brick-concrete structures is usually 50 years, but the actual lifespan is affected by factors such as the designed seismic coefficient and usage and maintenance conditions. If there is a lack of long-term maintenance, they may become unusable after 20-30 years. Regular maintenance is key to extending the lifespan of the house, including checking for wall cracks, panel joint leakage, foundation settlement, and other issues, and making timely repairs.
Inspection Requirements and Scenarios
Floor slab load capacity inspections are required in the following situations:
- House renovation: Such as adding floors or removing load-bearing walls that may change the structural load;
- Overloading: Such as increased loads due to warehousing or commercial use;
- After natural disasters: Earthquakes and other disasters may cause structural damage;
- Lack of maintenance records: When a building has been in use for more than 15 years and has no regular maintenance records, its structural safety needs to be evaluated.
It should be noted that the specific list of brick-concrete prefabricated panel houses may change with urban development. It is recommended to consult local real estate agencies or conduct on-site inspections before purchasing or using a house.
