Steel supports are critical load-bearing components widely applied in deep foundation pits, tunnel engineering, bridge construction, and large-scale structural projects, valued for their high strength, adjustable performance, and recyclability. They can be categorized by cross-sectional shape and construction design into multiple types, with different weight specifications favored in distinct regions worldwide based on local engineering standards and project demands.

Common Types of Steel Supports and Their Weight Characteristics

1. I-beam Steel Supports

I-beam steel supports are among the most traditional steel support products, featuring a standard I-shaped cross-section that provides excellent bending resistance for medium-load supporting scenarios. Their weight per linear meter ranges from 10kg to 60kg depending on specification: small-size I-beams (10#–20#) weigh 11.2–27.9kg/m, while large-size I-beams (30#–40#) weigh 48.1–67.3kg/m.

This type of steel support is most widely applied in North America, particularly in the United States and Canada. Historically, North America’s construction industry adopted unified ASTM steel standards that prioritize standardized I-beam products, making lightweight to medium-weight I-beam supports popular for small-scale foundation pit projects and temporary structural supports. In infrastructure renovation projects across U.S. urban areas, 20#–30# I-beam supports (weighing 27.9–48.1kg/m) remain the first choice for contractors due to their easy availability and simple installation.

2. H-section Steel Supports

H-section steel supports differ from I-beams with wider flanges, higher section inertia, and better overall stability, making them suitable for large-span, heavy-load supporting projects. Their weight ranges broadly: small H-sections (100×100mm) weigh around 17.2kg/m, while large heavy-duty H-sections (400×400mm) can exceed 140kg/m.

Heavy-weight H-section steel supports (over 80kg/m) are particularly prevalent in the European Union, where large-scale infrastructure projects such as cross-channel tunnels and high-speed railway stations demand high-stability supporting systems. Germany, France, and the Nordic countries have strict requirements for structural safety, leading to extensive adoption of heavy-duty H-section steel supports in deep foundation pit construction for high-speed rail and subway projects. Meanwhile, medium-weight H-sections (40–80kg/m) are widely used in residential and commercial building construction across Eastern Europe, balancing bearing capacity and cost efficiency.

3. Circular Pipe Steel Supports

Circular pipe steel supports are currently the most widely used type in modern underground engineering, offering superior torsional resistance and uniform stress distribution. Common specifications range from Φ400mm to Φ800mm in diameter, with wall thickness of 10–16mm, resulting in a weight range of 96–302kg per linear meter.

Medium-heavy circular pipe supports (120–200kg/m, represented by Φ609mm with 16mm wall thickness weighing approximately 235kg/m) dominate the Chinese market. China’s rapid urban subway expansion has created huge demand for deep foundation pit supporting systems, and circular pipe steel supports with prefabricated design, adjustable length, and recyclability perfectly match the construction characteristics of Chinese urban subway projects. In Southeast Asian countries such as Singapore, Malaysia, and Thailand, light to medium-weight circular pipe supports (below 180kg/m) are more widely used for urban infrastructure projects due to smaller excavation depths and limited hoisting capacity.

4. Lattice Steel Supports

Lattice steel supports are assembled from angle steel and steel plates, featuring lighter weight compared to solid section supports of the same bearing capacity, typically weighing 20–50kg/m. This type is primarily used for initial support in tunnel engineering.

Lightweight lattice steel supports are most widely applied in mountainous tunnel construction across South Asia, such as India, Nepal, and Bhutan. The region’s underdeveloped road transportation makes it difficult to transport heavy prefabricated steel supports, so lightweight lattice supports that can be assembled on site are more suitable for local construction conditions.

Conclusion

The regional application of steel supports of different weight specifications is shaped by local engineering standards, project scale, construction conditions, and transportation infrastructure. As global infrastructure development continues to advance, the steel support industry will further optimize product specifications according to regional demand, providing more targeted supporting solutions for engineering projects worldwide.