+86 022 2376 3704
+86 022 2376 3704
Prestressed Material
Rockbolts and cables for roadway roof support here usually use 21.8mm 19-wire pc strand . We have very familiar experience in manufacturing this specification.
ADVANTAGES
Raw material control: 82B high carbon wire rod with sorbite volume fraction of more than 85% is selected, the non-metallic inclusion grade is less than 2.0, and there is no high magnification microstructure defects such as reticular structure and martensite. 82B Ф 14.0 mm tensile strength not less than 1220 MPa, 82B Ф 13.0 mm tensile strength not less than 1200 MPa, 82B Ф 8.0 mm tensile strength not less than 1180 MPa; The elongation after fracture shall not be less than 9%, and the reduction of area shall not be less than 30%; Metallographic structure with a volume fraction of over 85% of sorbite
Drawing process: Control the drawing speed, reduce the deformation rate, and enable the steel wire to achieve high tensile strength while also achieving better plasticity and toughness.
After twisting: tension (240 ± 10) kN, tempering temperature (390 ± 5) ℃. Make the steel strand have better performance under loads exceeding 90% of the maximum force.
USE
-Where can our Rockbolts and cables be used?
Roadway Roof Rock anchoring
SPECIFICATIONS
| Structure | Standard | Nominal diameter | Tolerance on Diameter | Nominal Area of Section | Weight of strand | Tensile Strength, Rm | Minimum Breaking load,Fm | 0,2% proof force , Fp0.2 | Elongation Lo=500mm, Agt | Curvative of strand | Lay Length | The Relaxation at 1000h (initial load to 70% of nominal max load ) (r/%) Not more than |
| (mm) | (mm) | (mm2) | (kg/1000m) | (N/mm2) | KN | KN | (%) | mm | mm | |||
| 1x19S(1+9+9) | GB/T5224-2014 | 21.8 | +0.40,-0.15 | 313 | 2482 | 1770 | 554 | 488 | 3.5 | 25 | (12-18)d | 2.5 |
| 1x19S(1+9+9) | GB/T5224-2014 | 21. 8 | +0.40,-0.15 | 313 | 2482 | 1810 | 567 | 499 | 3.5 | 25 | (12-18)d | 2.5 |
| 1x19S(1+9+9) | GB/T5224-2014 | 21. 8 | +0.40,-0.15 | 313 | 2482 | 1860 | 583 | 513 | 3.5 | 25 | (12-18)d | 2.5 |
| 1x19S(1+9+9) | GB/T31314-2014 | 21. 8 | +0.60,-0.25 | 313 | 2482 | 1810 | 567 | 499 | 3.5 | 25 | (12-18)d | 2.5 |
| 1x19S(1+9+9) | GB/T31314-2014 | 21. 8 | +0.60,-0.25 | 313 | 2482 | 1860 | 583 | 513 | 3.5 | 25 | (12-18)d | 2.5 |
PACKAGE
As per clients’ requirement
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