φ42, φ46, φ47, Rock Anchor Bolts
Shandong Ruiyu Mining Materials Processing Co., Ltd. is a leading supplier of premium rock bolts, a top-tier rock anchor system engineered for exceptional ground support. As a critical component of modern mining roof bolting systems, our products deliver immediate, proactive reinforcement for underground safety and stability in the most demanding environments, including tunnels, shafts, and civil engineering projects.
What are Swellex and slotted pipe rock bolts?
Swellex rock bolts are friction-based expansion rock bolts. Manufactured from high-strength steel tubing with a pre-slotted design, they are inserted into drill holes and expanded using high-pressure water or grout. This rapid expansion generates a powerful, uniform grip along the entire drill hole length, providing immediate active support to the surrounding rock mass.
This mechanism harnesses the inherent strength of the rock itself, forming a stable load-bearing structure that effectively controls deformation and prevents rock failure.
Technical Specifications: Rock Bolts and Rock Anchors
Our product line includes various diameters and lengths to meet specific engineering requirements, including commonly used φ42, φ46, and φ47 rock bolts.
Diameter(±0.5) | 33mm | 39mm | 40mm | 42mm | 46mm | 47mm |
Length(±0.5) | 1.2m | 1.5m | 1.9m | 2.0m | 2.5m | 3m |
Mining Plate(±0.5) | 140*140*6mm,150*150*5mm,200*200*10mm | |||||
Material | Q235,16Mn,20 Mnsi | |||||
Key Advantages of Our Mining Roof Bolts
Selecting our rock bolts delivers significant project benefits:
✅ Immediate Active Support: Instantly bonds with and reinforces rock mass upon installation, substantially enhancing stability.
✅ Exceptional Handling: Easily transported and installed across diverse geological conditions.
✅ Rapid Installation Speed: Simplified drilling and expansion processes accelerate project timelines.
✅ Reduced Labor Intensity: Lighter weight and easier installation compared to traditional support systems enhance worker safety and efficiency.
✅ Significant Cost Savings: Lower material transportation costs and the ability to design smaller tunnel cross-sections reduce overall project expenditures.
Professional Installation Guide for Rock Bolts
Proper installation is critical to achieving the design performance of rock bolts. Our certified mining roof bolts require specialized equipment and a trained team.
Standard Installation Procedure:
Drilling: Using a rotary percussion drill, drill holes to the specified diameter and depth according to engineering design and standards (e.g., GBJ86).
Assembly: Fit the pressure plate onto the Swellex rock bolt shaft.
Insertion: Insert the bolt assembly into the drilled hole.
Expansion: Inject fluid (water/grout) using a high-pressure pump to uniformly expand the bolt and securely lock it into the surrounding rock.
Tightening: Secure the nuts to compress the pressure plate, ensuring tight contact with the rock surface.
Critical Quality Control Points:
For post-grouting applications, ensure optimal grout mix ratios to prevent leakage and achieve a fully saturated grout column.
Proper degassing during grouting is essential for eliminating air pockets and ensuring complete encapsulation, which is critical for long-term anchor effectiveness and corrosion protection.
Reliable Performance: Our rock bolts are trusted worldwide in mining and tunneling projects.
Quality Assurance: All products are manufactured to stringent quality standards and come with complete certificates of conformity.
Technical Support: We provide comprehensive technical data and support to ensure proper product selection and application.
Product Qualification
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