High Tensile Strength 7 Wire PC Strand

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High Tensile Strength 7 Wire PC Strand
7 Wire PC Strand is the steel strand which has been given a stress-relieving heat treatment.Composited with 7 wires , the diameter of the straight centre-wire is greater than the diameter of the outer helical wires . The latter is tightly spun around the centre wire with a pitch.7 Wire PC Strand is with features, low relaxation , high strength , high elongation. And widely being used in precast area.

Commonly available sizes for 7-wire strands include 9.3mm, 11.1mm, 12.7mm, 15.2mm, and 17.8mm. These sizes are often used in prestressed concrete applications such as post-tensioning systems for bridges, buildings, and other large-scale structures.

ADVANTAGES
7-wire PC (prestressed concrete) strand offers several advantages in the construction industry, making it a preferred choice for various applications. Here are the key advantages of using 7-wire PC strand:

1. Increased Structural Strength: 7 wire PC strand provides high tensile strength to reinforced concrete structures. By introducing pre-compression into the concrete, it enhances the structural strength and load-bearing capacity. This allows for the construction of longer spans, thinner sections, and taller structures without sacrificing stability and safety.
2. Improved Flexibility in Design: The use of 7 wire PC strand allows for greater design flexibility. The pre-compression introduced by the strand allows for the reduction or elimination of traditional reinforcement, resulting in slimmer and more aesthetically pleasing designs. It enables the creation of innovative architectural elements and the optimization of material usage.
3. Enhanced Durability: 7-wire prestressed concrete strand helps increase the durability of concrete structures. By counteracting tensile forces that develop over time, it minimizes the risk of cracking and deformation in concrete members. This extends the service life of the structure and reduces maintenance and repair costs over the long term.
4. Improved Load Distribution: The pre-compression introduced by 7-wire PC strand helps distribute loads more efficiently throughout the structure. It reduces stress concentrations in critical areas, ensuring a more uniform distribution of forces. This results in improved overall structural performance and a reduced likelihood of localized failures.
5. Controlled Deflection: 7-wire PC strand helps control and limit deflection in concrete structures. The pre-compression counteracts deflection caused by external loads, minimizing sagging or bending. This is particularly important in applications where stringent deflection criteria need to be met, such as in bridges or floors with specific design requirements.
6. Faster Construction: The use of 7-wire strand allows for faster construction compared to traditional reinforcement methods. The strand is typically tensioned and anchored after the concrete has cured, reducing the time required for formwork, concrete curing, and overall project completion. This can result in cost savings and earlier occupancy or utilization of the structure.
7. Optimized Material Usage: By strategically placing 7-wire PC strand in areas subjected to high tensile stresses, the need for additional reinforcement can be minimized. This optimizes material usage, reducing material quantities and associated costs.
8. Improved Crack Control: 7 wire strand helps control and limit crack widths in concrete structures. By introducing compressive stresses, it counteracts tensile stresses, reducing the likelihood and width of cracks. This is particularly important in structures where crack control is essential, such as water-retaining structures or structures exposed to aggressive environments.

USE
7 wire PC (prestressed concrete) strand is a type of high-strength steel strand commonly used in various construction applications. It is primarily used in prestressed concrete structures to provide strength and stability. Here are some of the key uses and applications of 7-wire PC strand:

1. Post-Tensioning Systems: 7-wire PC strand is widely used in post-tensioning systems for reinforcing concrete structures. It is typically installed in precast or cast-in-place concrete elements such as beams, slabs, columns, and bridges. The strand is tensioned and anchored to introduce pre-compression into the concrete, enabling it to withstand tensile forces and minimize cracking.
2. Bridges: 7 wire PC strand is extensively employed in the construction of bridges. It is used in the construction of bridge decks, girders, and other structural components. By incorporating prestressed concrete technology with the use of 7-wire PC strand, bridges can achieve longer spans, increased load-bearing capacity, and improved structural performance.
3. Buildings: 7-wire strand finds applications in various types of buildings, including commercial, residential, and industrial structures. It is used to reinforce and prestress concrete elements such as beams, slabs, and foundation systems. The prestressed concrete components offer enhanced structural integrity, reduced deflection, and increased resistance to cracking, contributing to the overall stability and durability of the building.
4. Parking Structures: 7 wire strand is commonly utilized in the construction of parking structures such as parking garages and parking decks. It provides the necessary reinforcement to support the heavy loads and dynamic forces experienced in parking facilities. The prestressed concrete elements created with 7-wire PC strand help ensure long-term performance, minimize maintenance needs, and maximize space utilization.
5. Railway Sleepers: High tensile strength 7 wire PC strand is used in the production of prestressed concrete railway sleepers, also known as railroad ties or crossties. The strand is tensioned and embedded within the concrete sleeper to enhance its load-bearing capacity, resist rail movement, and provide durability under the demanding conditions of railway tracks.
6. Infrastructure Projects: 7-wire prestressed concrete strand is employed in various infrastructure projects such as tunnels, dams, water treatment plants, and power stations. It reinforces critical concrete elements, ensuring structural stability and longevity in demanding environments.

SPECIFICATIONS
Our factory could accord to different standards to produce this product.

1x7 PC Strand available specifications
Full sizes in standards GB/T5224, EN10138:3,ASTM A416,BS5896
The main sizes in standards ASTM A779, ISO6934, UNE 36094, JIS G3536, KS D7002, ABNT NBR7483, GOST13840, GOST-R-53772, ASTM A886
1x7 PC Strand : GB/T5224

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tructure	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
1X7	9.5	+0.30 -0.15	54.8	430	1860	102	91.8	3.5	Max bow height = 25mm/ 1meter	(12-16)d	2.5
9.5	54.8	430	1960	107	96.3
11. 10	74.2	582	1860	138	124
11. 10	74.2	582	1960	145	131
12. 70	+0.40 -0.15	98.7	775	1860	184	166
12. 70	98.7	775	1960	193	174
15.2	140	1101	1860	260	234
15.2	140	1101	1960	274	247
15. 70	150	1178	1860	279	251
17. 80	191	1500	1860	353	318
(1X7)C	12. 70	112	890	1860	208	187
15. 20	165	1295	1820	300	270
18	223	1750	1720	384	346

1x7 PC Strand : ASTM A416

Grade	Nominal diameter	Tolerance on Diameter	Nominal Area of Section	Weight of strand	Tensile Strength	Minimum Breaking load	Minimum load at 1% Extension	Rp0.1%	Elongation Lo=610mm	Curvative of strand	Lay Length	The Relaxation at 1000h (initial load to 70% of nominal max load ) (r/%) Not more than
(mm)	(in.)	(mm)	(mm2)	(in.2)	(kg/ 1000m)	(lb/ 1000ft)	(N/mm2)	(KN)	(KN)	(KN)	(%)	mm
270 (1860)	9.53	3/8	+0.65,-0.15	54.80	0.085	432	290	1860	102.30	92.10	N/A	3.5	Not Specified	(12-16)d	2.5
11.11	7/16	+0.65,-0.15	74.20	0.115	582	390	1860	137.90	124.10	N/A
12.70	1/2	+0.65,-0.15	98.70	0.153	775	520	1860	183.70	165.30	N/A
15.24	3/5	+0.65,-0.15	140.00	0.217	1102	740	1860	260.70	234.60	N/A
17.78	7/10	+0.65,-0.15	189.70	0.294	1487	1000	1860	353.20	318.00	N/A

1x7 PC Strand : EN10138:3,

Steel Name	Steel Number	Diameter	Tensile strength	Cross-sectional area	Mass per meter	Permitted deviation on mass per meter	Characteristic value of maximum force	Maximum value of maximum force	Characteristic value of 0.1% proof force	Min.Elong. Lo=500mm	Curvative of strand	Lay Length	Relaxation 1000h value no more than (initial load at 70% specified breaking load)
D	Rm	Sn	M	Fm	Fm,max	Fp0.1
mm	MPa	mm2	g/m	%	kN	kN	kN	%	mm	mm	(%)
Y1860S7	1.1366	9.30	1860	52.0	406.1	±2	96.7	111.0	85.1	3.5	Max bow height = 25mm/ 1meter	(14-18)d	2.5
Y1860S7	1.1366	12.50	1860	93.0	726.3	±2	173.0	199.0	152.0
Y1860S7	1.1366	15.20	1860	139.0	1086.0	±2	259.0	298.0	228.0
Y1860S7	1.1366	15.70	1860	150.0	1172.0	±2	279.0	321.0	246.0
Y1960S7	1.1367	9.30	1960	52.0	406.1	±2	102.0	117.0	91.0
Y1960S7	1.1367	12.50	1960	93.0	726.3	±2	182.0	209.0	162.0
Y2060S7	1.1368	12.50	2060	93.0	726.3	±2	192.0	221.0	171.0
Y2060S7	1.1368	12.90	2060	100.0	781.0	±2	206.0	237.0	183.0
Y2060S7G*	1.1372	12.70	1860	112.0	874.7	±2	208.0	239.0	183.0
Y2060S7G*	1.1372	15.20	1860	165.0	1289.0	±2	307.0	353.0	270.0
Y1700S7G*	1.1370	18.00	1700	223.0	1742.0	±2	379.0	436.0	334.0