CT bolt most likely refers to cable-supported or combination tension bolts, a type of rock bolt used in underground mining and tunneling for ground support. These bolts combine features of both a point anchor and a fully grouted rock bolt, providing immediate support and long-term stability. Another possibility is tension control bolts (TC bolts or SC bolts), which are used for high-strength steel-to-steel connections in structural applications.
Used in underground excavations to reinforce rock and prevent collapses in mines, tunnels, and other subterranean structures.
They incorporate a combination of immediate point anchorage (often with an expansion shell) and a fully grouted section, providing both immediate and long-term support.
Typically installed in pre-drilled holes, with the expansion shell anchoring the bolt initially and grout used to fill the remaining space for permanent support.
Immediate support, long-term stability, corrosion resistance (especially when grouted), and suitability for various ground conditions.
Used in high-strength steel structures for connections requiring specific clamping forces to prevent slippage between connected surfaces.
The bolt’s head and a spline on the shank are engaged by a specialized wrench, allowing for controlled tensioning and ensuring proper clamping force.
Require specific tools (tension control wrenches) for proper installation and tightening.
Controlled tensioning, high strength, and suitability for critical connections in steel structures.In summary, while both types of bolts are called “CT” or “SC” (or TC), they have distinct applications:
are for ground support in underground construction, combining immediate and long-term reinforcement.
are for high-strength connections in steel structures, relying on controlled tensioning for stability.
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