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High Tensile Strength 7 Wire PC Strand

Country of Origin︰China
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Product Description

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

 

If you are looking for more details, kindly visit our website.

 

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 

Payment Terms︰TT,LC
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