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Strand

The steel strand is formed by a plurality of steel stranded steel products, steel surface can be according to the need of increased galvanizing layer, the zinc aluminum alloy layer, Bao Lvceng (aluminum clad), copper coating, epoxy coated (epoxy coated)
Galvanized steel strand usually refers to for catenary messenger wire and cable guy wire, to strengthen the core (core wire or strength member), can also be as the earth wire/ground wire of overhead transmission line, the road on both sides of the block cable barrier cable) or in the structure of the building structure of the cable structure cable). Prestressed steel strand of prestressed steel strand of uncoated low relaxation prestressed steel strand (uncoated steel strand for for concrete), zinc (Galvanized), commonly used in bridge, construction, water conservancy, energy and geotechnical engineering, unbonded prestressing steel wire (unbonded steel strand or monostrand) commonly used in the slab and foundation engineering.

Calculation of tension value of steel strand

Steel strand prestress tensioning construction design to control tension, refers to the tension before the completion of the cable tension in the anchor clamp. Therefore, when steel strand tensioning elongation of theoretical calculation, should to the distance between the steel wire at both ends of the anchorage points as the calculated length of steel strand, but in prestressed tension steel strand to control tensile force is at the jack tool anchor control, so control and calculation, general with the distance between the steel wire at both ends of the anchorage points, plus steel wire in tensioning jack working length, as the calculated length of prestressing steel strand tensioning theoretical elongation. The prestressed cable tension, the exposed part of the steel strand, most of them are wrapped in Anchorage and Jack, steel strand stretching elongation cannot in the steel strand, the direct measurement, so it can only be used to measure a pull jack piston stroke, calculation of steel strand tensile elongation, but should also be shrinking minus strand a Laquan process of anchor plug. The load bearing capacity of the steel strand should be 4-6 times of the total traction force.
(see the technical specification for construction of highway bridges and culverts) general calculation formulas for delta = delta L1 + delta L2-b-c graders: Delta L1: from the initial tension (bridge construction specifications generally for the design of control tension of 10% ~ 25%) to pull design control tension between the jack piston pulling stroke; Delta L2: initial tension when calculating the elongation value (in accordance with the provisions of the standard projections obtained); B: a tool anchor plug back shrinkage; C: the work anchor plug shrinkage and.

詳情介紹:1x2、1x3、1x7Low relaxation prestressed steel strand

structure	Nominal diameter （mm）	Allowable deviation （mm）	Approximate quality （g/m）	strength grade （Mpa）	Yield strength（Mpa）	Minimum elongation%	Stress relaxation property
							Percent of the initial equivalent to the maximum force%	1000 hours after stress relaxation rate is not greater than
1x2	5.0 5.8	+0.15 -0.05	77.1 104	1570-1960 1470-1960 1470-1860	≥90%Eb	3.5(lo≥400mm)	60 70 80	1.0 2.5 4.5
	8.0 10.00 12.00	+0.25 -0.10	197 309
1x3	6.2(5.41) 6.5(5.60)	+0.15 -0.05	155 166	1570-1960	≥90%Eb	3.5(lo≥400mm)	60 70 80	1.0 2.5 4.5
			296	1470-1960
	8.6(7.46) 8.74(7.56) 10.80(9.33) 12.90(11.20)	+0.20 -0.10	303	1570-1870
			462 666	1470-1960
1x7	9.50	+0.30 -0.15	430 582	1720-1960	≥90%Eb	3.5(lo≥400mm)	60 70 80	1.0 2.5 4.5
		+0.40 -0.20	775	1470-1960 1770-1860 1720-1860
			1470-1960 1770-1860 1720-1860

Note: (1) the nominal diameter of the 1x3 column is included within the measurement dimensions, and the allowable deviation is allowed for the measurement of the dimensions.
(2) this kind of product is mainly used in bridge, culvert, highway, large span construction project, electric power engineering.

Grade	Nominal diameter （mm）	Allowable deviation（mm）	Yield strength（Mpa）	Minimum elongation%	Stress relaxation property
					The percentage of the initial load is equal to the maximum.	1000 hours after stress relaxation rate is not greater than
250	3/8-3/5 (9.53-15.24)	±0.40	≥90%Eb	3.5	60 70 80	1.0 2.5 4.5
270	3/8-3/5 (9.53-15.24)	+0.65 -0.15	90%Eb

Note: according to the Japanese standard, British standard, Australian standard for production

Zinc aluminum alloy coated steel wire

structure	Diameter of wire rope（mm）	Diameter of wire rope（mm）	Strand break area（mm2）	Nominal tensile strength of steel strand（Mpa）					Reference weight（kg/100M）
				1175	1270	1370	1470	1570
				Aggregate of broken wire（KN≥）
1x7	1.20	3.6	7.92	9.31	10.06	10.85	11.64	12.43	6.29
	1.60	4.8	14.07	16.53	17.87	19.28	20.68	22.09	11.17
	1.80	5.4	17.81	20.93	22.62	24.40	26.18	27.96	14.14
	2.00	6.0	21.99	25.84	27.93	30.13	32.32	43.52	17.46
	2.20	6.6	26.60	31.26	33.78	36.44	39.10	41.76	22.79
	2.30	6.9	29.08	34.17	36.93	39.84	42.75	45.66	23.09
	2.60	7.8	37.17	43.60	47.20	50.92	54.63	58.30	29.51
	2.90	8.7	46.24	54.33	58.72	63.35	67.97	72.60	36.71
	3.00	9.0	49.48	58.14	62.84	67.79	72.74	77.68	42.38
	3.20	9.6	56.30	66.15	71.50	77.13	82.76	88.39	44.70
	3.50	10.5	67.35	79.14	85.85	92.27	99.00	105.74	53.48
	3.8	11.4	7.39	93.28	100.82	108.76	116.70	124.64	63.04
1x19	1.60	8.0	38.2	44.88	48.51	52.33	56.15	56.97	30.40
	1.80	9.0	48.35	56.81	61.40	66.24	71.07	75.91	38.49
	2.00	10.0	59.69	70.14	75.81	81.77	87.74	93.71	47.62
	2.20	11.0	72.22	84.86	91.71	98.94	106.16	113.39	56.69
	2.30	11.5	78.94	92.75	100.25	108.15	116.04	123.94	62.84
	2.60	13.0	100.88	118.53	128.12	138.20	148.29	158.38	80.30
	2.90	14.5	125.50	147.46	159.38	171.93	184.48	197.03	99.90
	3.00	15.0	134.30	157.80	170.56	183.99	197.42	210.85	105.53
	3.20	16.0	152.81	179.55	194.06	209.35	224.63	239.91	121.64
	3.50	17.5	182.80	214.79	232.16	250.44	268.72	287.00	145.51
	3.80	19.0	215.48	253.19	273.66	295.20	316.76	338.30	169.15

Zinc aluminum alloy coating steel wire

Nominal diameter（mm）	The coating weight is not less than - g/m2	Copper sulfate leaching times 60 seconds / time is not less than	Coating adhesion test
Nominal diameter（mm）	The coating weight is not less than - g/m2		The diameter of the core rod is a multiple of the diameter of the steel wire.	Number of winding turns
1.27-1.52	185	2	1	8
1.53-1.90	200	2
1.91-2.28	215	3
2.29-2.63	230	3
2.64-3.04	255	4	3
3.05-3.80	275	4	3

Galvanized steel stranded wire for steel wire

Nominal diameter（mm）	Tensile strength Mpa not less than	1% elongation stress Mpa is not less than	Percentage elongation at break (L=200mm) is not less than	Twisting times (/360) times
1.27-2.28	1310	1170	4	18
2.29-3.04	1310	1170	4	18
3.05-3.80	1310	1170	4	18

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Strand