Longitudinal Slit Type Concrete Sleeve Anchor φ43
Seam-welded pipe anchors are commonly classified within the industry as high-performance sleeve anchors, delivering exceptional anchoring performance through full-length friction and radial pressure. Manufactured from high-strength alloy steel strip, they are specifically engineered for demanding environments such as geotechnical applications, mining, and concrete reinforcement, offering reliability and adaptability far exceeding traditional double-expansion anchors.
Product Details and Working Principle
The slotted tube anchor is a tubular rod formed by rolling metal sheet into a longitudinally slotted tube. As a classic sleeve anchor, its working principle involves being driven into a slightly undersized borehole, where the tube body generates powerful radial pressure under compression. This pressure is then converted into friction anchoring force across its entire length.
Performance Highlights:
Exceptional Anchoring Capacity: Achieves 60–100 kN/m in sandstone, with sustained post-installation growth (e.g., increasing from 60 kN to 90 kN within 100 days in coal strata).
Exceptional Adaptability:
Demonstrates excellent bending toughness, accommodating surrounding rock deformation and borehole curvature, outperforming traditional double-expansion bolts.
Data Support:
Each meter of anchor generates approximately 25 kN of radial pressure. Thicker pipe walls yield greater anchoring force.
Specifications and parameters
Main Specifications: MF43 MF40 MF33
Length (mm): 1200, 1500, 1800, 2000, 2500
Material: Q235, 16Mn（Q345 Q355）, 20 Mnsi.
Installation Guide
Proper installation is critical to maximizing the performance of this high-performance concrete sleeve anchor.
Three-Step Installation Method:
Drilling: Drill holes according to the design specifications.
Hole Cleaning: Thoroughly clean the holes using a high-pressure blower.
Driving: Place the sleeve over the anchor rod and drive it into the hole using a hammer drill.
Recommended Drilling Parameters:
Rock Formation: Hole diameter = Bolt diameter × (0.9 - 0.95), Hole depth = Bolt length + 100mm, Deviation rate < 1%.
Coal Seam/Concrete: Hole diameter = Bolt diameter × (0.9 - 1.0), Hole depth = Bolt length + 200mm, Deviation angle < 1.5%.
ore Advantages: Why Choose Our Sleeve Anchor Bolts?
Superior Materials: Core constructed from high-strength alloy steel strips (e.g., Q345/Q355, 20MnSi) ensures exceptional load-bearing capacity and impact resistance.
Full-Length Active Support: Unlike point-anchorage double-expansion bolts, this high-efficiency sleeve anchor for concrete immediately applies three synergistic forces to the surrounding rock or concrete matrix upon installation:
Full-length radial pressure
Ultra-high static friction
Plate bearing force
Together, these forces create a stable pressure zone, significantly enhancing structural integrity.
Effortless Installation: Requiring no chemical anchoring agents or complex procedures, it is driven directly into pre-drilled holes, substantially reducing labor hours and costs.
Anchoring Force Increases Over Time: Following blasting vibrations or geological stress adjustments, the anchoring force does not diminish but significantly enhances, providing sustained safety assurance.
About Us
Shandong Ruiyu Mining Materials Processing Co., Ltd. is a technology-driven enterprise specializing in rock and soil support solutions. With a robust R&D team comprising 16 senior engineers and 28 technicians, along with advanced production facilities, we are committed to providing customers with high-quality, highly reliable products such as grouted pipe anchors (sleeve bolts) and comprehensive technical support.
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