Virsbolt 240, Virsbolt 240+
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General Product Description
Virsbolt 240 is used for tunneling, construction, and mining, especially when thicker material or higher strength is needed since the products have a load capacity of 53.95 kipf. The bolts are delivered in wall thicknesses between 0.091" - 0.118", and in bundles of 50 bolts.
Virsbolt 240+ is made of special steel and has undergone a precise annealing process to improve its elongation characteristics while maintaining a good load-bearing capacity. This gives it a better capacity to follow rock deformation by squeezing ground or high-strain concentration areas. Virsbolt 240+ could also be an alternative to Dynamic Rock Bolts since it can better absorb energy and be used at deeper levels in the mine.
Advantages of using Virsbolt:
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Provides immediate and full support action
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Accommodates large rock movements and still maintains its high load-bearing capacity
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High deformability to accommodate ground movements in tension as well as in shear
Dimension Range
Virsbolt, an expandable rock bolt, comes in various dimensions and load-carrying specifications. Please contact your local salesperson for more information.
Product | Virsbolt 240 & 240+ |
|---|---|
Profile diameter in. (mm) | 1.417" (36 mm) |
Original tube diameter in. (mm) | 2.126" (54 mm) |
Upper bushing diameter in. (mm) | 1.496" (38 mm) |
Bushing head diameter in. (mm) | 1.614" / 1.890" (41 / 48 mm) |
Standard length* ft (m) | 7.9' - 19.7' (2.4 - 6.0 m) |
*Other lengths upon request. |
Mechanical Properties
Product | Wall Thickness in. (mm) | minimum yild load (kN) | Typical Elongation A (%), not guaranteed | Elongation A (min %) | Typical breaking load (kN), not guaranteed | Minimum breaking load (kN) | Weight (kg/m) |
|---|---|---|---|---|---|---|---|
Virsbolt 240 light | 0.091" (2.3) | 220 | 20 | 10 | 250 | 240 | 2.08 lbs/ft (3.1) |
Virsbolt 240 | 0.118" (3.0) | 200 | 20 | 15 | 250 | 240 | 2.69 lbs/ft (4.0) |
Virsbolt 240+ | 0.118" (3.0) | 170 | 30 | 25 | 240 | 230 | 2.69 lbs/ft (4.0) |
Tolerances
Tolerances according to Jennmar specifications.
Please get in touch with your local salesperson for more information regarding tolerances.
Delivery Conditions
Dry/oiled/plastic coated. Virsbolt expandable rock bolts are delivered bundled. Virsbolt 240 & 240+ are delivered in bundles of 50 bolts per bundle.
Delivery requirements can be found in Jennmar's brochure Virsbolt, expandable rock bolt for rock reinforcement or at www.jennmar.se
Fabrication and Other Recommendations
Product | Virsbolt 240 & 240+ |
|---|---|
Recommended hole diameter in. (mm) | 1.693" - 2.047" (43 mm - 52 mm) |
Recommended inflation pressure psi (bar) | 4351 psi (300 bar) |