DYWI ® Drill Hollow Bar System

 

Technical Data

Bar Size
R25N R32N R32S R38N
Nominal Outer Diameter [in] / [mm] 1.00 25 1.26 32.0 1.26 32 1.50 38
Average Inner Diameter [in] / [mm] 0.55 14 0.73 18.5 0.59 15 0.75 19
Average Cross Section [in2] / [mm2] 0.45 290 0.67 430.0 0.81 520 1.19 770
Ultimate Load [kips] / [kN] 45 200 63 280 81 360 112 500
Yield Load [kips] / [kN] 34 150 52 230 63 280 90 400
Average Ultimate Tensile Stress [ksi] / [MPa] 100 690 94 650 100 690 94 650
Average Yield Stress [ksi] / [MPa] 75 520 77 530 78 540 75 520
Nominal Weight [lbs/ft] / [kg/m] 1.5 2.3 2.3 3.4 2.8 4.1 4.0 6.1
Maximum Drilling Depths [ft] / [m] 39 12 52 16 65 20 78 24
Bar Size
R51L R51N T76N T76S
Nominal Outer Diameter [in] / [mm] 2.00 51 2.00 51 3.00 76 3.00 76
Average Inner Diameter [in] / [mm] 1.42 36 1.30 33 2.06 51 1.77 45
Average Cross Section [in2] / [mm2] 1.38 890 1.66 1070 3.29 2120 4.26 2750
Ultimate Load [kips] / [kN] 124 550 180 800 360 1600 427 1900
Yield Load [kips] / [kN] 101 450 142 630 270 1200 337 1500
Average Ultimate Tensile Stress [ksi] / [MPa] 90 620 109 750 108 750 100 690
Average Yield Stress [ksi] / [MPa] 74 510 86 590 83 570 80 550
Nominal Weight [lbs/ft] / [kg/m] 4.7 7.0 5.6 8.4 11.2 16.7 14.8 22.0
Maximum Drilling Depths [ft] / [m] 85 26 98 30 118 36 118 36
NOTE: Maximum allowable test load is 100% of the yield load.
Average cross section area is based on average internal diameter of the bar.
The ultimate and yield load capacity are measured values.
The ultimate tensile and yield stress are calculated average values.
Mill length is 9"-10" (3m). Longer lengths are available on request.
Drilling depths are indicative only and subject to ground conditions and drilling methods.

DYWI ® Drill Accessories Properties

DYWI ® Drill Hollow Bars for tunnel portal stabilisation
DYWI ® Drill Hollow Bars for tunnel portal stabilisation
DYWI ® Drill Hollow Bars for anchors
DYWI ® Drill Hollow Bars for anchors
Bar Size Coupler Hex Nut Length

Length Diameter

in mm in mm in mm
R25N 5.91 150 1.5 38 1.61 41
R32N 6.30 160 1.65 42 1.77 45
R32S 6.30 160 1.65 42 1.77 45
R38N 8.66 180 2.01 51 2.36 60
R51L 7.87 200 2.48 63 2.76 70
R51N 7.87 200 2.48 63 2.76 70
T76N 8.66 220 3.82 97 3.15 80
T76S 8.66 220 3.82 97 3.15 80
Coupler and hexnut develop the full load capacity of the bar.
Bearing plates are available in any size and can be made from steel material conforming to ASTM A36 or ASTM A572 grade 50.