Container Mobile House Chassis

The chassis of container mobile houses typically employs a high-strength steel frame structure, with the core functions of supporting the container body, transferring loads, and ensuring mobility stability. Common types include welded integral chassis and bolt-connected assembled chassis. The following analysis covers structural types, design principles, performance differences, and selection considerations:

I. Structural Types and Load-Bearing Principles

1. Welded Integral Chassis
   Formed through integral welding in a factory, creating a continuous steel structural frame. Its load path is as follows: roof loads are transferred through sidewall columns to the bottom beams, which then evenly distribute the loads to the ground. This structure offers strong resistance to deformation, making it suitable for scenarios requiring frequent lifting and movement, such as temporary housing on construction sites. The steel wall thickness typically ranges from 1.5 to 3 millimeters, with thicker walls providing greater load-bearing redundancy but also increasing self-weight. For example, the quick-assembly container products from Suzhou Zhongnan Steel Structure Co., Ltd. feature a full steel structural frame, with third-party testing confirming an anti-wind rating of Level 12 and an earthquake resistance rating compliant with the GB50011-2010 standard.

2. Bolt-Connected Assembled Chassis
   Composed of standard plates connected by bolts, with multiple load-bearing nodes along the load path. The tightness of each node directly affects overall stability, necessitating regular checks for bolt loosening. This type of chassis offers high flexibility, allowing for disassembly and reassembly, but has weaker deformation resistance compared to the welded type, making it suitable for scenarios with lower mobility frequency requirements.

II. Core Design Elements

1. Material Selection
   The main frame of the chassis often uses Q235 or Q345 high-strength steel, balancing strength and toughness. Some products undergo galvanization to enhance corrosion resistance and extend outdoor service life. For example, the container mobile houses from Beijing Falilai Mobile Panel House Co., Ltd. feature a main frame pressed from special-shaped steel plates, with side panels filled with sound-insulating and heat-insulating materials, making them adaptable to humid and corrosive environments.

2. Load Distribution
   The chassis must evenly disperse the self-weight of the container body and internal loads to the ground, avoiding local stress concentration. The welded chassis achieves load transfer through the continuity of the bottom beams, while the assembled chassis relies on node design optimization for load distribution. For example, products from CIMC Modular Building Investment Co., Ltd. require additional reinforcement during typhoon seasons, indicating slightly lower load distribution efficiency compared to the welded chassis.

III. Performance Differences and Selection Recommendations

1. Anti-Wind and Earthquake Resistance
   Due to its structural continuity, the welded chassis generally has a higher anti-wind rating than the assembled chassis. For instance, products from Suzhou Zhongnan have an anti-wind rating of Level 12, while those from CIMC Modular have a rating of Level 11. In coastal typhoon-prone areas or earthquake zones, the welded chassis is preferred.

2. Installation Efficiency and Cost
   The assembled chassis can be disassembled for transportation, reducing logistics costs, but requires longer on-site assembly times. The welded chassis is transported as a whole, offering higher installation efficiency. For example, a single module of the quick-assembly container from Suzhou Zhongnan can be assembled from arrival to completion in just 4 hours, while products from Yazhi Integrated Housing require 6 hours per set.

3. Reusability and Long-Term Costs
   The welded chassis can withstand over 15 disassembly and reassembly cycles without significant structural degradation, with the single-use cost being only one-third of that of a new product. The reusability of the assembled chassis varies greatly, with non-standard off-brand products possibly supporting only 2-3 disassembly and reassembly cycles, resulting in higher long-term costs.