DYWI Drill® Hollow Bar System

Various Style Drill Bits for DYWI® Drill Soil Nails

Key Features

■ The tendon simultaneously serves as a drill rod

■ Extremely fast installation because borehole drilling is made redundant by simultaneous drilling and grouting

■ System can be installed in confined spaces utilizing simple and compact drilling equipment

■ Variable anchorage and angle compensation designs

■ Irregular grout body enhances capacity

■ Drill bits are available for various ground conditions

■ Can be used as a soil nail, rock bolt or a pile

Fields of Application

■ Slope, embankment and rock stabilization

■ Shoring and excavations ■ Fixation of rock fall mesh ■ Avalanche barriers ■ Foundations

Bearing Plate

Hex Nut Shotcrete

Cement Grout

DYWI Drill® Hollow Bar

Bevel Washers Coupler

Drill Bit

DYWI® Drill Hollow Bar System

Basic Concept

The DYWI® Drill Hollow Bar System consists of fully threaded steel bar sections, couplers, nuts and drill bits. It can be drilled and grouted into loose or collapsible soil without a casing. The bar sections feature a hollow center that allows for a simultaneous drilling and grouting operation.

The DYWI® Drill Hollow Bar serves as a drill rod. It is fitted with a lost drill bit at the front that can be adapted to different ground conditions. After each single bar section of 1 to 6m, the subsequent bar is coupled to the previously installed section.

During drilling, cement grout is injected into the hollow core of the bar using an injection adapter that is mounted on the drill rig. The cement grout exits at the bottom end through openings in the drill bit. The injected grout initially serves as slurry to stabilize the borehole and ensures the efficient flushing of the drill spoils. Once the grout reached strength it bonds the bar to the ground.

Once the required installation depth has been reached, the hollow bar serves as a steel tendon and can carry out its function as a soil nail, rock bolt or pile upon the grout reaching its required strength.

The comprehensive DYWI® Drill Hollow Bar System product range offers tendons with ultimate loads from 45 kips to 832 kips including all system components such as drill bits , couplers, spacers and anchor heads. Additional installation tools such as injection adapters can be produced customized or adjusted to job site requirements on short notice.

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DYWI Drill® Hollow Bar System

DYWI® Drill Hollow Bar – Micropile

Drill Bit

Drilled Hole Cement Grout (injected during drilling process)

DYWI® Drill Hollow Bar

Bearing Plate

Hex Nut

Concrete Structure

Coupler

Simultaneous Drilling and Grouting

DYWI® Drill Hollow Bar Properties

Bar Des.

Nominal Outer Diameter

Average Yield Strength

(fy)

Average Ultimate Tensile

Strength (fu)

Average Cross Section Area

(As)

Yield Load (fy x As)

Ultimate Load(fu x As)

Nominal Weight

[in] [mm] [ksi] [Mpa] [ksi] [Mpa] [in²] [mm²] [kips] [kN] [kips] [kN] [lbs/ft] [kg/m]

R25N 1.00 25 90 620 120 830 0.37 240 34 150 45 200 1.28 1.90R32N 1.26 32 94 650 116 800 0.54 350 52 230 63 280 1.81 2.70R32S 1.26 32 94 650 120 830 0.67 430 63 280 81 360 2.28 3.40R38N 1.50 38 97 670 122 840 0.91 590 90 400 112 500 3.16 4.70R51L 2.00 51 87 600 107 740 1.15 740 101 450 124 550 3.97 5.90T40N 1.57 40 99 680 123 850 1.19 770 118 525 148 660 4.03 6.00R51N 2.00 51 97 670 123 850 1.46 940 142 630 180 800 4.97 7.40T76N 3.00 76 83 570 110 760 3.22 2,080 270 1,200 360 1,600 10.95 16.30T76S 3.00 76 87 600 112 770 3.81 2,460 337 1,500 427 1,900 12.97 19.30

T103N 4.00 103 81 560 103 710 4.96 3,200 405 1,800 517 2,300 16.80 25.00T103S 4.00 103 74 510 103 710 8.06 5,200 600 2,670 832 3,700 26.88 40.00

Note: Maximum allowable temporary tension is the yield load. Cross section area is based on average internal diameter of the bar. The ultimate tensile and yield strength are calculated average values. Standard length = 9'-10" (3 m). Other lengths available on special order.

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A R G E N T I N AA U S T R A L I A

A U S T R I AB E L G I U M

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E S T O N I AF I N L A N DF R A N C E

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H O N G K O N GI N D I A

I N D O N E S I AI R A N

I TA LYJ A PA NK O R E A

L E B A N O NL U X E M B O U R G

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N E T H E R L A N D SN I G E R I AN O R W AY

O M A NPA N A M A

PA R A G U AYP E R U

P O L A N DP O R T U G A L

Q ATA RR U S S I A

S A U D I A R A B I AS I N G A P O R E

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S W E D E NS W I T Z E R L A N D

TA I W A NT H A I L A N D

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U N I T E D K I N G D O MU R U G U AY

U S AV E N E Z U E L A

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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.

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 dsiamerica@dsiamerica.com

DSI Canada Civil Ltd.

Eastern Division37 Cardico DriveStouffville, ON L4A 2G5Phone (905) 888-8988

St. Bruno, QCPhone (450) 653-0935

E-Mail ecd@dsiamerica.com

Western Division19433 96th Av. Suite 103Surrey, BC V4N 4C4Phone (604) 888-8818

Calgary, ABPhone (403) 291-4414

E-Mail wcd@dsiamerica.com