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A tunnel bolt, aslso known as segment / tunnel concrete rings connection bolts, is a specialized fastener used to connect prefabricated segments to form the cylindrical lining of a tunnel or to anchor rock in place for stability. Segment bolts are used to fasten the rings of precast concrete or metal segments together, while rock bolts are used to reinforce the rock mass itself. These bolts are crucial for maintaining the structural integrity of the tunnel and are designed to withstand the immense forces involved.
Types Of Tunnel Bolts
Types Of Tunnel Bolts
Segment bolts: These are used to connect individual segments, such as precast concrete rings, to form a continuous tunnel wall.
Straight bolts: These are used to connect segments radially and circumferentially.
Curved bolts (or banana bolts): These have an arc shape and are used to connect segments at joints.
T-head bolts: These are a type of segment bolt with a T-shaped head, designed to provide a secure grip for clamping.
Rock bolts: These are used to anchor and stabilize rock or soil walls and ceilings within a tunnel.
They work by transferring loads from the unstable surface to a more stable, stronger rock layer behind it.
Self-drilling rock bolts combine the drilling and bolting processes for faster installation.
Key Functions And Benefits
Key Functions And Benefits
Structural integrity: They hold the tunnel lining together, preventing collapse.
Ground control: By holding segments in place, they help control ground settlement and minimize impact on the surface.
Stability: Rock bolts reinforce the surrounding rock mass to prevent deformation and block falls.
Corrosion resistance: Because tunnels are often humid, these bolts are treated to resist rust and corrosion to ensure a long service life.
Raw Material Of Tunnel Bolts
Raw Material Of Tunnel Bolts
Mild Steel (4.6,5.6 grade):Steel Q235, 35#, 45#; Alloy Steel 40Cr, 42CrMo, 35CrMo
High Tensile Steel (8.8 grade):Alloy Steel 40Cr, 42CrMo, 35CrMo
Stainless Steel (304, 316 grade): According to customers' requirements.
Specs Of Tunnel Bolts
Specs Of Tunnel Bolts
Supplier Of Tunnel Bolts
Supplier Of Tunnel Bolts
Kunshan Signum Machinery Technology Co.,Ltd is capable of manufacturing and offering tunnel bolts according to customers' requirements or drawing with competitive price.
Contact Us
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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