DYWI ® Drill Hollow Bar System

DYWI ® Drill System

Advantages and Characteristics

The main advantages of the DYWI ® Drill Hollow Bar are:

  • Fast drilling and placing due to drilling, anchor installation and grouting in a single operation
  • Neither separate anchor installation nor removal of casing and drill rods
  • Similar installation methods for all ground conditions
  • Choice of drill bits for different ground conditions
  • The hollow core not only serves for flushing with air or water during drilling, but also for grouting the anchor tendon
  • Flexibility in length by using couplers
  • Ability to work with small drill rigs without casing in restricted headroom conditions
  • Accommodation of needs for enhanced protection against corrosion upon request
  • The accepted high standard of quality control from production stage to installation of the DSI Hollow Bar Anchors ensures consistent quality

DYWI ® Drill Hollow Bar System

1-anchor plate
2-anchor nut
3-anchor rod		4-coupler
5-cement grout
6-drill bit
*various drill bits for different ground conditions available

Fields of Application
  • soil nails
  • micropiles
  • temporary anchors
Technical DataUnit R25N R32L R32N R32S R38N R51L R51N T76N T76S
Outer diameter[mm] 25 32 32 32 38 51 51 76 76
Average inner diameter[mm] 14 22 18,5 15 19 36 33 51 45
Average cross sectional area[mm2] 290 340 430 520 770 890 1070 2120 2750
Ultimate load *1[kN] 200 220 280 360 500 550 800 1600 1900
Yield load *1[kN] 150 180 230 280 400 450 630 1200 1500
Average tensile strength *1[N/mm2] 690 650 650 690 650 620 750 750 690
Average yield strength *1[N/mm2] 520 530 530 540 520 510 590 570 550
Weight[kg/m] 2.32.7 3.4 4.1 6.1 7.0 8.4 16.7 22.0
Thread standard- ISO 10208 ISO 1720 T76 *2
Steel grade- acc. to EN 10083-1
Delivery lengths- 1m, 2m 3m, 4m, 6m

*1 The ultimate load and yield load capacity are measured values. The tensile-/yield strengths are calculated average values
*2 Internal standard

DYWI ® Drill Assembling

Connecting the drill bitDrilling with anchor rodsGrouting through hollow coreStressing the anchor by torque wrench or hollow cylinders