Hydraulic Expansion Rock Bolt - An Efficient Solution for Mine Support

Product Overview

The hydraulic expansion rock bolt is an innovative anchoring system specifically designed for mine support. Made from seamless steel tubes with an outer diameter larger than the borehole, it achieves high-strength anchoring through the hydraulic expansion principle. Its core advantages include instant load-bearing capacity, high anchoring force, and the ability to adapt to complex geological conditions. It is particularly suitable for fractured strata and collapse-prone areas in mining operations, effectively addressing the insufficient anchoring force of traditional rock bolts in weak surrounding rock. It is a critical support tool for mine safety.

Core Advantages: Breaking Tradition, Redefining Mine Support Standards

ChangQi hydraulic expansion rock bolts, with their unique design and technical features, have become the preferred solution for mine support:

• High Anchoring Force & Instant Load-Bearing Capacity: Hydraulic expansion tightly compresses the steel tube against the borehole wall, achieving an anchoring force of up to 80KN (example value, adjustable by specification). It can bear loads immediately after installation without waiting for curing time.
• Adaptability to Complex Geological Conditions: Especially suitable for fractured zones, fault areas, and soft rock layers, the expanded steel tube forms uniform contact with the borehole wall, avoiding localized stress concentration.
• Zero Loss & Convenient Storage: Packaged in sealed containers to prevent deformation or damage during transport and storage. On-site installation only requires inserting into the borehole and injecting high-pressure water, making the process simple and efficient.
• Customized Solutions: Supports personalized customization of diameter (12mm, 28mm, 38mm), length (e.g., 2.4m example), end fittings (e.g., base plates), etc., to meet the diverse needs of different mines.

Technical Specifications: Precision Matching for Mining Engineering Needs

Working Principle: Hydraulic Expansion, the Core of Anchoring Force

The ChangQi hydraulic expansion rock bolt operates in three steps:

1. Pre-Installation State: The bolt consists of a double-layered irregular steel tube (outer layer flat, inner layer round) with an outer diameter slightly larger than the borehole. It remains compressed when inserted.
2. Hydraulic Expansion: High-pressure water (typically ≥30MPa) is injected into the tube via specialized equipment, forcing the flat tube to expand outward and tightly fit the borehole wall.
3. Anchoring Formation: The expanded tube generates significant friction with the borehole wall, while its elastic deformation provides additional anchoring force, forming a stable support structure.

This design eliminates the cumbersome "drilling-grouting-curing" process of traditional rock bolts, enabling efficient "plug-and-play" support.

Applications: Comprehensive Coverage for Mine Support

ChangQi hydraulic expansion rock bolts are widely used in various mining projects:

• Tunnel Support: Replaces traditional frame supports in coal and metal mine tunnels, reducing labor input.
• Stope Roof Reinforcement: Prevents roof collapse in thin coal seams or fractured roofs through dense bolt arrangements.
• Fractured Zone Stabilization: Quickly stabilizes surrounding rock in fault or fold areas with high adaptability.
• Slope Protection: Reinforces slopes in mine waste dumps and tailings ponds to prevent safety incidents caused by soil erosion.

Brand & Services: ChangQi's Commitment

• Direct Factory Supply: As a manufacturer, ChangQi offers competitive pricing while ensuring consistent product quality.
• Customization Support: Tailors bolts to special mine requirements (e.g., unique geology or dimensions) with one-on-one technical solutions.
• Samples & Testing: Free samples available. Products comply with GB and other national/industry standards for regulatory compliance.
• Logistics & After-Sales: Ships via Tianjin Port, accepts T/T payments, and provides full logistics tracking and technical support.

Conclusion

ChangQi hydraulic expansion rock bolts redefine mine support standards with innovative technology, efficient installation, and reliable performance. No matter the geological challenges, ChangQi delivers customized solutions to enhance mine safety and project efficiency.

Note: Specifications can be adjusted per actual requirements. Contact ChangQi customer service for customized quotes and technical solutions.