Reinforcement stabilized strands (ropes) GOST 13840-68
  • Standard: GOST 13840-68
  • Diameter range, mm: 9,0-15,0
  • Tensile strength, MPa: 1670, 1770
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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.

Strand (rope) of the right twist
Strand (rope) of the left twist

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 valuesCalculated 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
9,09,35177053419+0,15, -0,393,579,54,0
12,012,40177093736+0,2, -0,4164,0139,54,0
15,015,2016701391098+0,2, -0,4232,0197,04,0
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

Strands

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

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