China Rock Anchor
Advantage:
Twist Anchor Bolts offer superior performance in Mining Anchor Bolts applications, making them a top choice for Rock Bolts for Mining and Underground Mining Bolts. Their unique helical design ensures excellent load-bearing capacity and secure anchoring in unstable rock formations. Unlike conventional bolts, twist bolts provide enhanced friction and immediate support, reducing installation time and improving safety in mining operations. These bolts are ideal for Underground Mining Bolts due to their corrosion resistance and durability in harsh conditions. As reliable Mining Anchor Bolts, twist bolts optimize ground reinforcement, ensuring long-term stability in tunnels and shafts. For efficient Rock Bolts for Mining, twist anchor bolts deliver unmatched strength and cost-effectiveness.
Product Description:
Twist Anchor Bolts are a highly efficient solution for Mining Anchor Bolts applications, offering exceptional stability and load-bearing capacity in challenging environments. Designed as specialized Rock Bolts for Mining, their unique helical structure provides superior grip and immediate reinforcement, making them ideal for underground support systems. These bolts are crafted from High Strength Rebar, ensuring durability and resistance to corrosion, even in the most demanding mining conditions.
As a premier choice for Mining Anchor Bolts, twist bolts excel in securing loose rock formations, reducing displacement risks, and enhancing safety in tunnels and shafts. Their installation is faster compared to traditional bolts, minimizing downtime and labor costs. The combination of their High Strength Rebar construction and twist design allows for optimal stress distribution, preventing premature failure and extending service life.
Engineers prefer Rock Bolts for Mining like twist anchors due to their adaptability in various geological conditions, from soft coal seams to hard rock strata. Whether used in temporary or permanent support systems, these bolts deliver unmatched performance, making them a cost-effective and reliable option for modern mining operations.
For projects requiring robust Mining Anchor Bolts, twist anchor bolts stand out for their strength, ease of use, and long-term reliability—key factors in maximizing operational efficiency and safety.
Specifications and parameter：
Pseudolaric acid | norm（mm） | yield strength (MPa) | tensile strength (MPa) | elongation (%) | yield load (KN) | tensile load (KN) |
twist anchor | M16 | 235 | 360 | 15-20 | 40 | 55 |
twist anchor | M18 | 235 | 360 | 15-20 | 50 | 75 |
twist anchor | M20 | 235 | 360 | 15-20 | 60 | 95 |
Product Overview:
Twist Anchor (Twist Bolt) is a kind of mechanical anchor widely used in mine roadway support, tunneling projects, slope reinforcement. Its unique spiral structure design makes it easy to install, strong anchoring force and wide adaptability, which makes it an economical and efficient alternative to traditional resin anchors. Our twist anchors are made of high quality steel and are available in different diameters (16-22mm) and lengths (1.2-3m) to meet the needs of various projects.
Product Performance Advantages:
1. High-strength anchoring performance
Cold-rolled Q235 or No. 45 steel, tensile strength of more than 400MPa
Spiral structure increases the contact area with the rock body, providing higher resistance to pullout
Suitable for support of medium stable rock formations with f=4-8
2. Rapid Mechanized Installation
No need for resin anchors, direct drilling and installation
Equipped with special installation equipment, the installation time of a single root is only 2-3 minutes
Parallel operation of tunnel boring and support can be realized.
3. Good adaptability
Suitable for broken rock layer, weak surrounding rock conditions
Can be combined with steel mesh, W steel belt joint support
Surface can be galvanized to improve anti-corrosion performance
Production process:
1. Selection of raw materials
Selection of high quality low carbon steel coil (Q235)
Carbon content of steel is controlled at 0.12%-0.20%
Tensile strength ≥370MPa, elongation ≥26%
2. Cold roll forming
Rolling of round steel into spiral shape through a special mill
Pitch is controlled at 60-80mm (adjusted according to the diameter)
Formation of a continuous high-strength thread on the surface
3. Thermal treatment
Adoption of tempering treatment to improve mechanical properties Hardness is controlled at HRC22-28 to ensure sufficient toughness and fatigue resistance 4. Surface treatment Optional hot-dip galvanizing treatment (zinc layer thickness ≥μm) or epoxy resin coating for corrosion prevention Tempering is used to improve the mechanical properties
Hardness is controlled at HRC22-28
Ensuring sufficient toughness and fatigue resistance
4. Surface treatment
Optional hot-dip galvanizing (zinc layer thickness ≥50μm)
or epoxy coating for corrosion protection
Extending the service life in humid environments
Installation:
1. Drilling preparation
Use hydraulic drill truck or pneumatic rock drill to drill holes
Drill diameter is 4-6mm larger than the diameter of the anchor
Hole depth should be 50-100mm longer than the length of the anchor
2. Anchor installation
Align the twisted anchors with the drilled holes
Rotate and push them forward by using the special installation equipment
Installation torque is controlled at 150-200N-m
3. Pallet installation
Install the spherical pallet and friction reducing washer
Use the nuts to preload the preload force, preload force less than 50kN. Not less than 50kN
W-band can be added when used with reinforcing mesh
4. Quality inspection
Check the exposed length of the anchor rods (30-50mm)
Spot-check 5% of the anchor rods for pull-out test (pull-out force ≥80kN)
Record the installation parameters of each row of anchor rods
