DYWI Drill Hollow Bar Soil Nail

Self-drilling system for loose soil, no casing required.

DYWIDAG Dywi Drill Hollow Bar Soil Nails are ideal for loose soils, as they can be installed without the need for a casing. The system is used for mixed fills, granular material, and loose overburden. DYWIDAG Dywi Drill Hollow Bar Soil Nails allow drilling and grouting to be combined as a single operation and complies fully with EN 14490 (European standard for soil nails).

Available for any length of service life, the DYWI Drill Hollow Bar Soil Nails are a passive system suitable for installation where open hole drilling and grouting is not possible, such as in cohesionless soils.

  • Quicker installation as drilling and grouting are done simultaneously

  • Passive system suitable for use even in poor soil conditions

  • Left-hand thread compatible with percussive drill tooling for complete installation flexibility

  • Bar diameters R25-R51 supplied with rope thread; T76 supplied with trapezoidal thread

  • Range of drill bits for soils and rock, including tungsten carbide buttons and chisels to suit all applications

  • External thread enables the bars to be cut and coupled at any point, as well as terminated with a nut, for easy on-site length adjustments

Main standards for steel nuances

Europe/ Asia/ Latin America: EN 10083-1

UK:  EN 10083-1

North America:  Tendons with ultimate loads from 45 kips to 832 kips


  • Rotary injection adapters to connect between the hammer and the hollow bar, enable grout to be injected into a rotating bar

  • Drill bit adaptor sleeves offer the option of using larger diameter drill bits with smaller bars

  • Beveled washers for use on bearing plates on uneven ground support

  • Range of drill tooling including reducing couplers, box/pin adaptors and drill spanners

  • Corrosion protection options include grout cover, sacrificial corrosion allowance, hot-dip galvanizing, Duplex (hot-dip galvanizing and epoxy coating)

  • Bearing plates with angle compensation or shear tubes

  • Domed nuts, hex nuts, couplers and steel spacers

  • Válvulas antiretorno para la instalación de micropilotes en lugares con un nivel freático alto, sin necesidad de bombear agua.

Commercial & Residential Buildings