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What are Tunnel Steel Sleepers?
Steel sleepers are a specialized railway track component frequently used in tunnel construction, underpasses, and bridges due to their unique strength-to-weight ratio and compact design. Unlike bulky concrete sleepers, steel sleepers allow for a lower construction height, making them an ideal solution for retrofitting tracks within the height constraints of existing tunnel bores.
Steel sleepers have a stable structure and are widely used in many fields, including railway systems and mines. In tunnel construction, rail sleepers are the most common rail supports. Depending on the size of the tunnel and the requirements of the engineering construction, sleepers can be designed in various structural forms to meet engineering needs.
Key Benefits for Tunnel Applications
Low Profile & Space Saving: Steel sleepers require up to 60% less ballast depth than concrete alternatives. This allows engineers to match existing track levels in tunnels without the need for extensive excavation or structural modifications.
Ease of Installation in Confined Spaces: Weighing approximately 80kg—significantly lighter than concrete—these sleepers can often be handled manually or with lighter equipment. This flexibility is critical in narrow tunnel environments where heavy crane access is restricted.
High Stability on Curves: The design of steel sleepers distributes loads evenly, reduces track deformation on tight tunnel curves, and enhances durability on weak ground.
Durability and Longevity: Modern steel sleepers are designed for high-performance rail systems with a typical service life of 30 to 50 years. When treated with anti-corrosion coatings like hot-dip galvanizing, they withstand the damp conditions often found in underground environments.
Signum Rail Fastening offers a wide range of sleepers for different purposes. Signum also offers customization based on your TBM's specific gantry distance and axle load requirements.
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