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DYWIDAG Micropiles – GEWI® Piles
Hex Nut
Plastic Centralizer
Coupler
DYWIDAG THREADBAR®
Shop grouted Corrugated Plastic Sheathing
Coupler with Corrosion Protection
Bearing Plate
Hex Nut
Concrete Structure
Plastic Centralizer
Drilled Hole Cement Grout (field installed)
Drilled Hole Cement Grout (field installed)
End Cap
Drill Bit
Drilled Hole Cement Grout (injected during drilling process)
Coupler
Hex Nut
DYWIDAG THREADBAR®
Bearing Plate
Hex Nut
Concrete Structure
Hex Nut
DYWI® Drill Hollow Bar
Bearing Plate
Hex Nut
Concrete Structure
DYWIDAG Micropiles – GEWI® Piles
Basic Concept
A GEWI® Pile is a drilled and grouted micropile, with a diameter of less than 12 inches. It is centrally reinforced with either one or a group of DYWIDAG THREADBARS. The deformations on the bar transfer the load into the surrounding grout body and friction transfers the load from the grout into the ground.
Key Features
■ Compact lightweight drilling equipment allows for pile installation even in areas with low headroom
■ Small economic drill hole diameters ■ Drill holes can be placed closely to existing walls or structures
■ Vibration free drilling prevents damage to adjacent structures
■ Double Corrosion Protected (DCP) bars may be utilized for piles in aggressive ground.
■ Multiple bars can be installed into a single borehole.
■ Short bar sections with couplers can be utilized in low headroom locations.
■ Continuous, coarse thread allows for rough site handling and for easy on-site length adjustments since cutting or coupling of the rod is possible along its entire length
■ DYWI® Drill Hollow bars can be utilized in caving ground conditions without casing because they are drilled and grouted simultaneously
GEWI® Pile with Single Corrosion Protection (SCP)
GEWI® Pile with Double Corrosion Protection (DCP)
Micropile with DYWI® Drill Hollow Bar
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DYWIDAG Micropiles – GEWI® Piles
GRADE 75, 80 DYWIDAG THREADBAR® – Reinforcing Steel per ASTM A615
THREADBAR®
Designation
Maximum THREADBAR®
Diameter
Minimum Yield Stress
(fy)
Nominal Cross Section Area
(As)
Minimum Yield Load
(fy x As)Nominal Weight
[mm] [in] [mm] [ksi] [MPa] [in²] [mm²] [kips] [kN] [lbs/ft] [kg/m]
#6 19 0.86 22 75 517 0.44 284 33.0 147 1.50 2.23#7 22 0.99 25 75 517 0.60 387 45.0 200 2.04 3.04#8 25 1.12 28 75 517 0.79 510 59.3 264 2.67 3.97#9 29 1.26 32 75 517 1.00 645 75.0 334 3.40 5.06
#10 32 1.43 36 75 517 1.27 819 95.3 424 4.30 6.40#11 36 1.61 41 75 517 1.56 1,006 117.0 520 5.31 7.90#14 43 1.86 47 80 552 2.25 1,452 180.0 801 7.65 11.38#18 57 2.50 64 80 552 4.00 2,581 320.0 1,423 13.60 20.24#20 63 2.72 69 80 552 4.91 3,168 393.0 1,748 16.70 24.85
#24* 75 3.18 81 75 517 7.06 4,555 529.5 2,355 24.09 35.85 #28* 90 3.68 94 75 517 9.62 6,206 721.5 3,209 32.79 48.80
Note: Maximum allowable temporary tension is 90% of minimum yield load. Mill length is 60 ft (#6 through #24) and 53 ft for #28. * Threadbar sizes not listed by ASTM A 615 but yield strength is in conformance with A615 standard.
GRADE 100 DYWIDAG THREADBAR® – Reinforcing Steel per ASTM A615
THREADBAR® Designation
Maximum THREADBAR®
Diameter
Minimum Yield Stress
(fy)
Nominal Cross Section Area
(As)
Minimum Yield Load
(fy x As)Nominal Weight
[mm] [in] [mm] [ksi] [MPa] [in²] [mm²] [kips] [kN] [lbs/ft] [kg/m]
#6 19 0.86 22 100 689 0.44 284 44.0 196 1.50 2.23#7 22 0.99 25 100 689 0.60 387 60.0 267 2.04 3.04#8 25 1.12 28 100 689 0.79 510 79.0 351 2.67 3.97#9 29 1.26 32 100 689 1.00 645 100.0 445 3.40 5.06
#10 32 1.43 36 100 689 1.27 819 127.0 565 4.30 6.40#11 36 1.61 41 100 689 1.56 1,006 156.0 694 5.31 7.90#14 43 1.86 47 100 689 2.25 1,452 225.0 1,001 7.65 11.38#18 57 2.50 64 100 689 4.00 2,581 400.0 1,779 13.60 20.24#20 63 2.72 69 100 689 4.91 3,168 491.0 2,184 16.70 24.85
Note: Maximum allowable temporary tension is 90% of minimum yield load. Mill length is 60 ft.
GRADE 150 DYWIDAG THREADBAR® – Prestressing Steel per ASTM A722
THREADBAR® Designation
Maximum THREADBAR®
Diameter
Minimum Ultimate Tensile Strength
(fu)
Nominal Cross Section Area
(As)
Minimum Ultimate Tensile Load
(fu x As)Nominal Weight
[in] [mm] [in] [mm] [ksi] [MPa] [in²] [mm²] [kips] [kN] [lbs/ft] [kg/m]
1 26 1.252 32 150 1,034 0.85 548 127.5 567 3.01 4.481 ¼ 32 1.445 37 150 1,034 1.25 806 187.5 834 4.39 6.531 36 1.630 41 150 1,034 1.58 1,019 237.0 1,054 5.56 8.271 ¾ 46 2.008 51 150 1,034 2.58 1,665 387.0 1,721 9.37 13.94
2 ¼* 57 2.482 63 150 1,034 4.08 2,632 612.0 2,722 14.55 21.652 ½ 65 2.790 71 150 1,034 5.16 3,329 774.0 3,443 18.20 27.08
3 75 3.146 80 150 1,034 6.85 4,419 1,028 4,571 24.09 35.85
Note: Maximum allowable temporary test tension is 80% of minimum ultimate tensile load. Mill lengths are 60 ft for 1", 1 ¼", 1 " and 1 ¾" and 45 ft for 2 ¼", 2 ½" and 3" bars. * Threadbar size not listed in the ASTM A 722 but its strength is in conformance with this standard. WARNING: DO NOT WELD on or near A722 prestressing bars or their anchorages.
For Hollow Bar Properties see: DYWI® Drill Hollow Bar System Brochure
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Please Note: This brochure serves basic information purposes only. Technical data and information provided herein shall be considered non-binding and may be subject to change without notice. We do not assume any liability for losses or damages attributed to the use of this technical data and any improper use of our products. Should you require further information on particular products, please do not hesitate to contact us.
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U S AV E N E Z U E L A
www.dsiamerica.comwww.dsicanada.ca
DYWIDAG-SystemsInternational USA Inc.
320 Marmon DriveBolingbrook, IL 60440Phone (630) 739-1100
Toughkenamon, PAPhone (610) 268-2221
Washington, D.C.Phone (302) 293-2377
Pompano Beach, FLPhone (954) 532-1326
Mansfield, TXPhone (817) 473-6161
Long Beach, CAPhone (562) 531-6161
Tucker, GAPhone (770) 491-3790
Kent, WAPhone (253) 859-9995
E-Mail [email protected]
DSI Canada Civil Ltd.
Eastern Division37 Cardico DriveStouffville, ON L4A 2G5Phone (905) 888-8988
St. Bruno, QCPhone (450) 653-0935
E-Mail [email protected]
Western Division19433 96th Av. Suite 103Surrey, BC V4N 4C4Phone (604) 888-8818
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