Container House Demolition

The demolition of container houses requires adherence to systematic procedures and safety regulations, involving professional assessment, structural dismantling, component classification, and compliant transportation. The following provides an explanation from three aspects: demolition procedures, technical key points, and case analysis.

I. Demolition Procedures and Core Steps
The demolition of container houses should follow the principle of "assessment before dismantling, unloading before lowering the frame". First, conduct on-site surveys to verify the original construction drawings and actual load distribution, delineate the work alert zone, and install fall protection nets and rigid isolation barriers. Taking the process of Qingdao Xinwanda Container Technology Co., Ltd. as an example, the top enclosure is stripped using manual tools in conjunction with light lifting equipment, removing roof skylights, insulation cotton, and color steel plates sequentially to prevent high-altitude throwing. For the frame structure dismantling, connection nodes are cut in reverse order of "columns-beams-supports-floor slabs" to release residual stress, and direct violent demolition is strictly prohibited. During the component sorting and transportation phase, steel, aluminum alloy profiles, and door and window hardware should be sorted and packaged separately, and connected with local disposal sites or renewable resource warehouses.

II. Technical Key Points and Safety Control

1. Structural Stability Control: For multi-story container houses, the lateral stiffness of corrugated plate walls should be simulated using finite element software, and equivalent cross-bracing and pinned columns at both ends should be used to simulate vertical load-bearing capacity. For example, in the analysis of a double-story container fire station, ANSYS software was used to verify the reduction effect of corrugated plate openings on stiffness, ensuring that the maximum inter-story displacement angle of the structure meets the requirements of GB 50017-2017 "Steel Structure Design Standard".
2. Connection Node Treatment: Horizontal clip nodes and cross clip nodes should undergo numerical simulation analysis of load-bearing capacity and shear stiffness. For the connection of four adjacent containers on the outer surface of multi-story houses, an "X-shaped" clip node should be designed to avoid "blocking" phenomena, and spring models should be used to simplify subsequent seismic performance research.
3. Environmental Protection and Resource Utilization: During the demolition process, dust suppression and traffic staggering scheduling should be strengthened, especially in heavy industrial cities where noise and dust reduction equipment should be equipped. Recyclable components such as steel and aluminum alloy profiles should be transported to renewable resource warehouses to avoid secondary pollution caused by rough construction.

III. Typical Case Analysis

1. Illegal Building Demolition: The Urban Management Bureau of Tong'an District, Xiamen, once forcibly demolished container houses illegally built on rooftops. These buildings were assembled in a "stacking" manner with six containers, and the container connections were simply fixed with iron sheets and screws, posing serious safety hazards. The demolition used large cranes for separate operations, completing the cleanup of 120 square meters of illegal construction in two hours.
2. Temporary Facility Clearance: After the completion of engineering projects, the demolition of prefabricated houses should follow national safety management regulations for temporary structures, systematically stripping the top enclosure, dismantling the frame structure, and assessing residual value before compliant transportation. For example, in Shandong, demolition factories are required to deeply integrate dismantling operations with resource utilization to avoid structural damage.
3. Seismic Performance Optimization: Research on five-story modular container houses shows that the end plate opening model meets the specifications under minor earthquakes of magnitude 9, but needs improvement for major earthquakes above magnitude 7; the side plate opening model only meets minor earthquakes below magnitude 9. The seismic performance can be improved through embedded composite beam-column systems, providing a theoretical basis for the design of high-rise container houses.