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Tunnel bolt is used for segment concrete rings connection in tunnel applications. Among these bolts for tunnel construction, hexagonal flange bolts are quite popular.
For tunnel segment construction, hexagonal flange bolts are engineered to distribute load over a wider area than standard hex bolts, reducing the need for a separate washer. These specialty bolts require high tensile strength and corrosion resistance for long-term structural integrity. Kunshan Signum Machinery Technology Co.,Ltd offers custom-made options to meet specific project demands.
Key features for tunnel Segment bolts
Key features for tunnel Segment bolts
High tensile strength: The bolts are typically made from high-strength materials such as Class 10.9 (metric) or Grade 8 (imperial) alloy steel.
Corrosion resistance: Due to the underground environment, protective finishes are crucial. Common finishes include hot-dip galvanizing, zinc-yellow, or phosphate and oil coatings to prevent rust and corrosion.
Vibration resistance: Serrated or ribbed flanges can be used to prevent the bolt from loosening under vibration, which is a common concern in heavy-duty applications like tunnel construction.
Specialized hexagonal flange bolts used in tunnel construction are high-strength, anti-corrosive fasteners designed to securely connect and seal precast concrete segments. These are different from standard flange bolts and are manufactured to withstand the heavy loads and environmental factors unique to tunneling projects.
Types of tunnel segment bolts
Types of tunnel segment bolts
Custom hexagonal flange bolts: These are manufactured to a customer's specific print or dimensions for a project. They feature a hex head and a built-in washer-like flange that distributes the load over a wider area, providing greater stability and a stronger connection. They are available with serrated or ribbed flanges to resist loosening from vibration.
Banana bolts (curved tunnel bolts): These are curved to fit the radial and circumferential joints of a tunnel's precast concrete segments. They are used to permanently fix the tunnel segments together and are available in various grades and finishes, including Mild Steel and High-Tensile Steel.
Spear bolts and sockets: Used to permanently fix tunnel segments, these are available in various lengths, diameters, and finishes. They are similar to curved bolts but are typically installed in a single action.
T-head bolts: These bolts feature a T-shaped head and are commonly used in tensioning and clamping applications. They are often black oxidized, galvanized, or coated.
Key requirements for tunnel bolts
Key requirements for tunnel bolts
Bolts used in tunnel construction must meet rigorous specifications to ensure the long-term integrity and safety of the structure.
High tensile strength and grade: Bolts must be high-strength to maintain stability under dynamic loads and withstand the constant pressure and vibrations in a tunnel environment. High-tensile grades(such as 10.9) are often used.
Anti-loosening design: In high-vibration applications, features like serrated or ribbed flanges, wedge-lock washers, or double-nut systems help prevent the bolts from loosening.
Corrosion resistance: Given the harsh underground conditions, bolts require robust protective coatings to guard against moisture and corrosion. Common coatings include:Hot-dip galvanizing,Zinc-yellow plating,Phosphate finishes,etc.
Precision and standards: For guaranteed performance and compatibility, tunnel bolts must comply with international standards like ISO, DIN, or ASTM.
Simplified installation: The design should allow for efficient and quick installation, which is critical in confined tunneling spaces. The integral washer-like flange of a flange bolt eliminates the need for a separate washer, speeding up assembly.
Manufacturer & Supplier Of Hexagonal Flange Bolts
Manufacturer & Supplier Of Hexagonal Flange Bolts
Kunshan Signum Machinery Technology Co.,Ltd is able to supply hexagonal flange bolts for tunnel connections according to customers' requirements or drawing with competitive price.
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Direct Line:+86 512 50353196
Whatsapp:+86 158 6266 4803
Email: admin@rail-fastening.com
Web: www.rail-fastening.com
Address: 120 Tongjing Road, Lujia Town, Kunshan, Jiangsu 215331, China
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