Container House Bottom Fixed Beam

The container house bottom fixed beam is usually made of steel such as I-beams, channel steel, or C-shaped steel. It is a key load-bearing component of the container bottom structure, whose function is to evenly transfer the floor load to the ground and enhance the overall stability of the container body.

Structural Types and Materials

The container house bottom fixed beams (including bottom beams and bottom cross beams) are mostly made of Q235 steel or high-strength weather-resistant steel, which have high strength and corrosion resistance. Their cross-sectional shapes are usually I-shaped, C-shaped, or U-shaped, and they are welded and fixed to the bottom side beams to form a supporting frame. For example, a standard 20-foot container requires the installation of 18 bottom cross beams. The material thickness is generally 4.0mm ± 0.2mm, and the wing plate width of some models can reach 80mm to enhance the load-bearing capacity.

Load-Bearing and Force Path

In welded container houses, the roof load is transferred to the bottom beams through the side wall columns and then evenly distributed to the ground through the bottom beams, forming a direct force path. This structure has strong resistance to deformation and is suitable for frequent lifting and moving. In bolt-connected assembled containers, there are multiple connection nodes in the force path. The wall thickness of the steel used in the bottom beams (common specifications range from 1.5 millimeters to 3 millimeters) directly affects the overall stability. The thicker the wall thickness, the greater the load-bearing redundancy.

Installation and Fixing Requirements

The installation of the bottom beams should ensure even contact with the ground. If placed directly on soft soil, it may cause uneven settlement of the container body, leading to deformation of doors and windows or cracks in the walls. Therefore, for long-term fixed use, a concrete strip foundation should be poured (the recommended width is 30 centimeters to 50 centimeters, and the depth is determined according to the thickness of the frozen soil layer). The levelness error of the foundation top surface should be controlled within 2 millimeters per meter. For short-term use scenarios, pre-fabricated concrete pads or steel pads can be used. The spacing between the pads should not exceed 2 meters, and a crushed stone leveling layer should be laid below them.

Optimization and Improvement

Some enterprises improve the performance of the bottom beams through technological improvements. For example, by adding C-shaped steel purlins between the bottom beams, the load is evenly distributed to each main beam, enabling the container body to maintain structural stability even when stacked three layers high. Or by using patented technologies (such as I-shaped reinforced structures) to increase the load-bearing strength of the threshold beams, resist the impact during cargo loading and unloading, and reduce the risk of bottom deformation.