H1：Split Set Rock Bolt | Complete Guide to Pipe Seam Friction Bolt for Underground Support
Opening paragraphSplit set rock bolt, also known as pipe seam bolt or friction stabilizer bolt, is a mainstream passive friction anchoring product widely applied in global underground mining, roadway reinforcement and tunnel engineering. Manufactured from slotted high-strength seamless steel pipe, the split set rock bolt generates continuous radial extrusion friction with surrounding rock after being driven into the drilled hole, realizing instant surrounding rock support without grouting or resin medicine. As a professional Chinese manufacturer of split set rock bolts, we supply standard & customized pipe seam bolts to mining contractors in Australia, South Africa, Russia, Southeast Asia and Latin America.
H2 1. Working Principle of Split Set Rock Bolt (Pipe Seam Bolt)
The core supporting logic of split set rock bolt depends on the elastic compression recovery of the slotted steel tube. When the outer diameter of the split set bolt is slightly larger than the drilling aperture, pneumatic rock drills hammer the bolt into the rock hole. The slotted pipe is compressed inward, and the elastic rebound force forms uniform radial pressure on the hole wall along the full length of the bolt body. The friction force between the bolt outer wall and rock mass locks loose rock layers to prevent roof falling and surrounding rock deformation.
Matching accessories: steel pallet + driving ring form a complete split set anchoring system, dispersing local pressure on rock surface.
H2 2. Core Structural & Material Parameters of Split Set Rock Bolt
H3 2.1 Common Standard Sizes (Hot-selling Export Specifications)
Outer diameter: 30mm, 33mm, 39mm, 43mm, 47mm
Common length: 1.2m, 1.5m, 1.8m, 2.0m, 2.4m, 2.5m, 3.0m
Pipe wall thickness: 2.0mm ~ 3.5mm customized
H3 2.2 Raw Material & Surface Treatment
Base material: Q235 carbon steel, 16Mn high strength steel (main export materials)
Surface treatment: black oxide / hot-dip galvanized / zinc diffusion treatment (anti-corrosion for wet mine, coastal tunnel projects)
Executive standard: China MT/T 285-2025, matched with international split set detection standards
H2 3. Outstanding Advantages of Split Set Rock Bolt Compared with Other Anchors
- Instant bearing capacity: No waiting time for resin solidification, roadway support can be finished immediately after installation, greatly improving tunneling progress.
- Low overall construction cost: No grouting equipment, no chemical anchoring agent, fewer supporting tools, reducing comprehensive construction input by 30%~50%.
- Good adaptability to broken rock mass: Full-length friction contact can adapt to fractured, soft and loose rock formations, not easy to fail under small rock displacement.
- Simple installation & low failure rate: Only drilling + hammer driving construction, workers can operate proficiently with simple training, suitable for large-scale underground roadway rapid support.
- Long service life: Integral steel pipe structure with strong anti-shear performance, stable supporting effect in long-term underground dynamic pressure environment.
Post time: 2026-07-27 17:11:41
