Bottom Beam of Container Mobile House

The bottom beam of a container mobile house usually adopts a steel structure frame, with materials mostly being hot-dip galvanized steel sheets or thickened steel strips. It is formed through welding, bolt connection, or specific profiling processes, featuring high strength, corrosion resistance, and modularity.

1. Structural Forms and Connection Methods
The bottom beams of container mobile houses are mainly divided into two forms: welding and bolt connection.

• Welded bottom beams: These are commonly seen in packing boxes. The columns and top and bottom beams are fixed through welding, providing high structural stability and excellent waterproof performance, but requiring a relatively long assembly time. For example, the packing boxes of Shandong Weichang New Building Materials Co., Ltd. use welding processes, with a seismic intensity of up to 8 degrees and a service life of about 20 years.
• Bolt-connected bottom beams: Represented by quick-assembly boxes, these connect the columns and crossbeams through fastening screws, offering high installation efficiency. Skilled teams can complete the assembly of a single room within a few hours. For example, the 3m×6m quick-assembly box of Wenzhou Tongfu Portable Houses adopts pre-punched holes and detachable bolt designs, supporting rapid assembly and disassembly as well as repeated use.

2. Materials and Processes
The material of the bottom beam directly affects the durability and safety of the house.

• Hot-dip galvanized steel sheets: These are the mainstream choice, formed by rolling through profiling machines. The galvanized layer on the surface effectively prevents rust. For example, the prefabricated steel frame chicken coop bottom beams of Qingdao Lanjing RT Steel Structure Co., Ltd. use hot-dip galvanizing processes and are suitable for humid environments.
• Thickened steel strips: Some manufacturers use thickened steel strips to enhance load-bearing capacity. For example, the expandable container bottom beams of Zhongyu Steel Structure Co., Ltd. support multi-layer stacking and frequent movement.
• Modular design: The bottom beams, along with corner fittings, crossbeams, and other components, are produced in a standardized manner, facilitating rapid assembly. For example, the quick-assembly box frames of Foshan Jingcheng Housing Construction use standardized bolt connections, allowing assembly without welding.

3. Functional Characteristics
The design of the bottom beam needs to balance strength, stability, and adaptability.

• Load-bearing and seismic resistance: Steel structure bottom beams can withstand large loads and adapt to complex terrains such as construction sites and disaster areas. For example, the container bottom beams of Xi'an Tengdaxing Housing Engineering use steel frame structures and have a wind resistance rating of up to 11 degrees.
• Corrosion resistance and durability: The combination of hot-dip galvanizing treatment and sandwich panel walls extends the service life. For example, the container mobile house bottom beams of Beijing Falilai, paired with color-steel sandwich panels, have a service life of over 15 years.
• Flexibility and expandability: Some bottom beams support horizontal or vertical expansion to meet diverse needs. For example, the modular mobile house bottom beams of Suzhou Cybright Technology can achieve space expansion through splicing.

4. Application Scenarios and Selection Recommendations
The type of bottom beam should be selected based on the usage scenario.

• Frequent movement scenarios: Priority should be given to bolt-connected bottom beams, such as quick-assembly boxes, which offer convenient assembly and disassembly and lower costs.
• Long-term fixed scenarios: Welded bottom beams are more stable and suitable for packing boxes or high-rise container houses.
• Extreme environments: Enhanced corrosion protection for the bottom beams is required, such as using hot-dip galvanized steel sheets in coastal areas and adding insulation layers in cold regions.