DYWIDAG-SYSTEMS INTERNATIONAL
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GEWI Steel High Yield Yield Threadbar System
G A D I W Y D
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GEWI Steel High Yield Threadbar System GEWI® Steel High Yield Threadbar is a high tensile alloy steel bar which features a coarse left-hand thread over its full length. The system is proven worldwide and offers versatility in a range of applications. Manufactured in accordance with the German Certicate of Approval (Deutsches Institut für Bautechnik), the system also offers general conformance with BS 4449 : 2005 (Steel for the Reinforcement of Concrete). The minimum specied characteristic yield strength is 500 N/mm2 for bar diameters 16 - 50mm and 555 N/mm2 for the 63.5mm diameter bar. 16 - 50mm bars can be welded using appropriate industry practices relative to the carbon content of the steel. Welding of the higher grade 63.5mm diameter bar is also acceptable with additional measures . Key features of the system are: ● ● ● ●
Fully Threaded Bar - can be cut and coupled at any point. Robust Threadform - ideal for construction site use. Coarse Pitch Threadform (d/2, except Ø 63.5mm which is d/3) with two ats – ensures thread is self cleaning. Fully Galvanized Systems - galvanized threadbars and accessories also available from stock. ®
Technical Data for GEWI Steel High Yield Threadbar Nominal Diameter
Steel Grade
Ultimate Strength f pu
mm 16 20 25 28 32 40 50 63.5
N/mm2 500/600 500/600 500/600 500/600 500/600 500/600 500/600 555/700
kN 121 188 295 370 482 756 1176 2217
Yield
Strength
70% (b) Ultimate Strength
50% Ultimate Strength
Cross Sectional Area
Diameter Over Threads
Thread Pitch
Bar Weight
kN 85 132 206 259 337 529 823 1552
kN 61 94 147 185 241 378 588 1108
mm2 201 314 491 616 804 1260 1960 3167
mm 19 23 28
mm 8 10 12.5 14 16 20 26 21
kg/m 1.58 2.47 3.85 4.83 6.31 9.87 15.40 24.80
kN 100 157 245 308 402 630 980 1758
32 36 45 56 69
(a) Yield Stress, in general terms, equals 0.1% Proof Stress. (b) For geotechnical applications 75% fpu may be used for proof testing.
Modulus of Elasticity: E = 205,000 N/mm2 +/- 5%. Stock Lengths: All bar diameters 12.0m. Tolerances +/- 100mm. Special lengths up to 18.0m are available to order. All bar diameters can be cut to length to suit customer requirements or supplied bent to BS 8666 : 2000. ®
Couplers for GEWI Steel High Yield Threadbars Couplers enable GEWI® Steel Threadbars to be coupled or extended, reliably and efciently. It is important that the two threadbars meet centrally within the coupler, and remain so during installation, to ensure correct load transfer. Coupler strength= 1.3 x Yield Strength of the bar , which equates to 1.08 x Ultimate Strength, in accordance with German Approval Certificates. With all types of coupler, precautions should be taken to ensure that the coupler remains centrally located during handling and installation. This can be achieved through the use of grub screws, a centre pin or lock nuts. The choice of coupler type depends on the application. The static coupler is used either in constant tension or a combination of tension and compression loading, with the longer dynamic coupler used when vibration and cyclical load reversals are anticipated.
standard coupling
centre pin - optional
paint - visual indicator
grub screws - optional
Lock nuts should be used at each end of the coupler when the threadbar is used in reinforced concrete applications designed in accordance with BS 8110. These lock nuts should be torqued to a predetermined value to prevent cracking of the structural concrete at the coupler when the joint comes under load. See table on Page 3 for torque values.
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GEWI Steel Threadbar
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GEWI Steel High Yield Threadbar Accessories Nominal Diameter
Flat Plate Stock Size *
mm 16 20 25 28 32 40 50 63.5
mm 150 x 150 x 10 150 x 150 x 10 150 x 150 x 10 150 x 150 x 10 200 x 200 x 30 200 x 200 x 40 300 x 300 x 50 300 x 300 x 50 (a)
Nominal Static Coupler Diameter Dia. Length mm mm mm 16 32 90 20 36 105 25 40 115 28 45 125 32 52 140 40 65 160 50 80 200 63.5 102 260
Hexagonal Nut AF Length mm mm 32 40 36 45 41 50 46 55 55 60 65 70 85 80 100 115
Domed Nut AF Length mm mm
Recessed Plate Stock Size * mm 150 x 150 x 20 150 x 150 x 20 150 x 150 x 20 150 x 150 x 20 200 x 200 x 30 200 x 200 x 40 300 x 300 x 50
(b)
35 38 43 46
(a)
Static Coupler Dynamic Coupler Dia. Length Dia. Length mm mm mm mm 32 90 30 115 36 105 34 130 40 115 40 150 45 125 45 170 52 140 50(AF) 180 65 160 60(AF) 210 80 200 80(AF) 240 102 260 102 260
41 45 54 57
Lock Nut AF Length mm mm 32 30 32 40 41 40 41 45 50 50 65 70 80 85 100 115
Formed Plate Stock Size * mm 150 x 150 x 10 150 x 150 x 10 150 x 150 x 10 150 x 150 x 10
Torque Value Nm
300 400 700 950 1500** 2900** 8000** 8000**
AF mm 30 36 41 46 50 60 80 100
Hemisphere Dia. Length mm mm 46 18 46 18 57 23 57 23 80 33 120 55 120 60
Flanged Nut Length mm 35 40 45 50 60 70 85 115
Dia. mm 50 60 70 85 100 120 150 250
* Anchor plates can be supplied in any size to suit customer requirements. ** Torque applied to lock nut using hydraulic torque wrench. (a) Machined coupler (b) Cast coupler.
Nuts
Plates
Hexagonal Nut
Flat Plate
Domed Nut
Lock Nut
Flanged Nut
Formed Plate
Articulating Plate
Gusseted Plate
up to 20
up to 30
up to 45
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Couplers
Static Coupler
Dynamic Coupler
Contact Coupler
Transition Coupler
Accessories
Mechanical Shell
Tapered Washer
Hemisphere
Lifting Shackle
up to 15
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Corrosion Protection Galvanizing to BS EN ISO 1461 : 1999
Rock Bolts Soil Nails Temporary Ground Anchors
Double Corrosion Protection to BS 8081 : 1989
Permanent Soil Nails Permanent Ground Anchors
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GEWI Steel Threadbar
up to 30
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Applications Soil Nails
Mini Piles
Reinforcement
Sheet Pile Ties
Spandrel Wall Ties
Rock Bolts
Lifting Bolts
Ground Anchors
Stressing Equipment Jack Selection Chart Capacity Stroke Weight 100kN 150mm 15kg 140kN 150mm 15kg 300kN 50mm 21kg 300kN 150mm 36kg 600kN 50mm 37kg 1100kN 50mm 46kg 1500kN 180mm 50kg 250mm 2000kN 180kg
16
Bar Diameter mm 28 32
20
25
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40
50
63.5
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Stressing Dimensions Nominal Diameter
Steel Grade
Dim. A
Dim. B
mm 16 20 25 28 32 40 50 63.5
N/mm2 500/600 500/600 500/600 500/600 500/600 500/600 500/600 555/700
mm 40 45 50 55 60 70 85 115
mm 45 55 60 65 70 80 100 130
A
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W E G
Dimension B is the minimum threadbar projection required for stressing.
DYWIDAG-SYSTEMS INTERNATIONAL LTD. Northeld Road Telephone Southam Facsimile Warwickshire E-mail CV47 0FG Web Site
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9 0 0 2 y a M
01926 813980 01926 813817
[email protected] www.dywidag-systems.com/uk
Quality Assurance
DYWIDAG-Systems International Certificate Number FM 25723
