High Tensile Force PC Strand For Underground Projects

Mining steel strand is a high-strength prestressed material used for reinforcement of surrounding rock of coal mine roadway. Mining steel strand has reliable anchoring performance, sufficient bearing capacity and good applicability. The advantages and safety of anchor cable support have been fully demonstrated. If there are anti-corrosion requirements for mining anchor cables, corresponding anti-corrosion measures can be taken according to the environmental conditions

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ADVANTAGES

Primary advantages

High Tensile Strength

Specific Length Cutting can be available

USE

-Where can our 1x7 prestressed steel strand be used?

Underground project , not only coal-mine roadway surrounding rock reinforcement , but also some tunnel projects.

Our mining steel strand also can be used on most geotechnical projects.

- How to Choose the right mining steel strand?

The right mining steel strand and anchoring agent shall meet following requirements of design load , ultimate loading holding capacity , anchor caoacity.

The safety factor of mine anchor cable is calculated according to the following formula.

K = Ru/Nt

Where:

K - safety factor of mining anchor cable, K value is not less than 1.5;

Ru - ultimate load holding capacity, in Newton (N);

Nt - design load, in Newton (N)

The ultimate load holding capacity shall be calculated according to the following formula.

Ru = ηa * n * Sn * Rm

Where:

Ru - ultimate load holding capacity, in Newton (N);

ηa- efficiency coefficient of anchorage (take 0.95);

n - number of steel strands;

Sn - Reference sectional area of a single steel strand, in square millimeter (mm 2);

Rm - Tensile strength of steel strand, in mega pascal (MPa),

The design load of mining anchor cable is calculated according to the following formula.

N t = m * n * Sn * Rm

Where:

Nt - design load , in Newton (N);

m - control coefficient of tensile stress of mining anchor cable, m value is not more than 0.60;

n - Number of steel strand;

Sn - reference sectional area of single steel strand, in mm2;

Rm - tensile strength of steel strand, in mega pascal (MPa)

When the anchor cable is tested in the laboratory, the anchor caoacity Tw should not be less than 1.05 times of the design load of the anchor cable, that is Tw >= 1.0 5Nt,

-Some common attentions in using of our mining steel strand.

Mining anchor cables should be lightly loaded and unloaded during transportation, and should not be thrown at will, so as to ensure that the anchor cable products are not damaged or contaminated with oil.

The anchor cable should be used as soon as possible after it is made. If it needs to be stored for a long time, it should be placed in a dry and clean place to avoid rust and oil pollution.

SPECIFICATIONS

Mining Steel Strand - 19 WIRES PRESTRESSED CONCRETE STEEL STRAND

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	28. 6	+0.40,-0.15	532	4229	1720	915	805	3.5	25	(12-18)d	2.5
1x19S(1+9+9)	GB/T5224-2014	17.8	+0.40,-0.15	208	1652	1770	368	334	3.5	25	(12-18)d	2.5
1x19S(1+9+9)	GB/T5224-2014	19. 3	+0.40,-0.15	244	1931	1770	431	379	3.5	25	(12-18)d	2.5
1x19S(1+9+9)	GB/T5224-2014	20.3	+0.40,-0.15	271	2149	1770	480	422	3.5	25	(12-18)d	2.5
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	28.6	+0.40,-0.15	532	4229	1770	942	829	3.5	25	(12-18)d	2.5
1x19S(1+9+9)	GB/T5224-2014	20.3	+0.40,-0.15	271	2149	1810	491	432	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	17.8	+0.40,-0.15	208	1652	1860	387	341	3.5	25	(12-18)d	2.5
1x19S(1+9+9)	GB/T5224-2014	19.3	+0.40,-0.15	244	1931	1860	454	400	3.5	25	(12-18)d	2.5
1x19S(1+9+9)	GB/T5224-2014	20.3	+0.40,-0.15	271	2149	1860	504	444	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
1x19W(1+6+6/6)	GB/T5224-2014	28. 6	+0.40,-0.15	532	4229	1720	915	805	3.5	25	(12-18)d	2.5
1x19W(1+6+6/6)	GB/T5224-2014	28. 6	+0.40,-0.15	532	4229	1770	942	829	3.5	25	(12-18)d	2.5
1x19W(1+6+6/6)	GB/T5224-2014	28. 6	+0.40,-0.15	532	4229	1860	990	854	3.5	25	(12-18)d	2.5
1x19	JIS3536	19.3	+0.60,-0.25	243.7	1931		451	387	3.5		(12-18)d	2.5
1x19	JIS3536	20.3	+0.60,-0.25	270.9	2149		495	422	3.5		(12-18)d	2.5
1x19	JIS3536	21.8	+0.60,-0.25	312.9	2482		573	495	3.5		(12-18)d	2.5
1x19	JIS3536	28.6	+0.60,-0.25	532.4	4229		949	807	3.5		(12-18)d	2.5

PACKAGE

At least 8 steel strips + PE film + packing cloth composed by paper and woven + pallet

Workmanship

Wire rod entering into our factory → wait the wire rod after aging period → wire rod surface treatment → 9 times drawing → half -finished product , inspection , configure right coils ready for stranding → stranding → tension and heat treatment → big reel of finished products → coil as per specific weight range, both ends of coil be tested → coil stay in normal condition for at least 24 hours → weighing → packing → label