- Standard: GOST 13840-68
- Diameter range, mm: 9,0-15,0
- Tensile strength, MPa: 1670, 1770
Instruction for unwinding reinforcing strands (ropes)
Coils of reinforcing strands (ropes) are marked with a paper self-adhesive label with the image “arrow” to indicate the direction of unwinding of the strand in the following order (Figure 1):
– On the reinforcing strands (ropes) of the right twist, the arrow is directed inside the coil;
– On reinforcing strands (ropes) of the left twist, the arrow points outward of the coil.
Figure 1 Direction of unwinding of a strand (rope)
To avoid tangling of strands (ropes) during their processing, it is necessary to unwind a reinforcing strand (rope) depending on the direction of stranding (rope) in the direction indicated by the arrow (Figure 1).
The dimensions and properties of the strands according to GOST 13840-68
Nominal values | Calculated values | |||||||
Nominal strand diameter d, mm | Strand diameter d, mm | Tensile strength Rm, N/mm2 | Cross-section area Sn, mm 2 | Mass of one meter length M, g/m | Allowable deviation from the nominal diameter, mm
| Minimal breaking force kN
| Strength at conditional yield strength Р0.2%, kN | The minimum value of the total elongation at maximum load, Agt, with Lo ≥ 300 mm, %
|
7-wire | ||||||||
9,0 | 9,35 | 1770 | 53 | 419 | +0,15, -0,3 | 93,5 | 79,5 | 4,0 |
12,0 | 12,40 | 1770 | 93 | 736 | +0,2, -0,4 | 164,0 | 139,5 | 4,0 |
15,0 | 15,20 | 1670 | 139 | 1098 | +0,2, -0,4 | 232,0 | 197,0 | 4,0 |
Note a. The elastic modulus (E) can be taken as 195 GPa (kN / mm2) Note b. The nominal linear density (mass of one meter of length) of the product is calculated from the cross-sectional area and density of 7.85 kg / dm3. Note c. Stresses at conditional yield strength of 0.2% is calculated for all diameters as 85% of the breaking strength. Relaxation after 1000 hours is not more than 2.5% Special properties in accordance with the additional requirements of GOST 13840-68 |
The strands are delivered in coils: - inner diameter: 750 mm, 800 mm, 900 mm; - outer diameter: max. 1600 mm; - width: 750 mm, 630 mm; The maximum weight of the coils is 4 tons. 7-wire strands are delivered with in-line styling.
- Type of winding:Strands
- Dimensions, mm, d*D*h:750 mm, 630 mm;
- Weight kg:4 t
- Diameter range, mm:750 mm - 1600 mm