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A self drilling bar is a hollow bar threaded for the whole length, obtained by a cold rolling of a smooth tube.

The features of drilling bars offer many benefits and can be used from soil nails and anchors to micropiles and rock bolts.

Their use combines the load-bearing function to the drilling and are precisely used for the stabilization of soils and structures acting on the load-bearing system by fortifying it.

The drilling bars are used in the post-tensioning sector and for various works of geotechnical and structural engineering as they provide many advantages: they are easy to handle on the building site, they can be provided in the 6.00 meter standard size or custom cut, they bond very well with concrete and with simple procedures.


Drilling bars can also protect against corrosion and they are very effective for nailing ridges, cliffs and escarpments, for the stabilization of slopes and the containment of natural slopes.  


They also serve as an anchor for nets and rockfall barriers and are used for excavation walls of foundations, in tunnels and for underground works and for viaducts.


This self-drilling reinforcement system is used in civil engeneering and underground construction and in particular for rock mass stabilization,in tunneling and mining industry fields.


R-Tubi S.p.A. manufactures and distributes high resistance drilling bars with two different systems:

  • The standard system with hollow bars shaped of controlled steel worked with a cold process;

  • The heat treatment system in which the same bars after been machined, undergo a complementary thermal treatment in order to increase resistance.

The drilling bars have an external variable diameter usually from 32 mm to 51 mm and an inner diameter which depends from the external one.

The hollow of the bar allows rotary percussion drilling with air, water, grout and fluids with a range of button and edged drill bits from 51 to 130 mm

Threads Technical Features

Bars Technical Features 





  • Discharge of the hydrostatic underlying pressure

  • Stabilization of slopes and excavations

  • Anchorage of avalanche protection

  • Anchoring in particularly difficult grounds and with different solidity

  • Consolidation of escarpments and unstable slopes

  • Soil nailing

  • Tie-beams for bulkheads/soldier pile walls


  • Stabilization of tunnel portals

  • Front insertions in mines and underground tunnels

  • Surface stabilizations

  • Radial bolting into the rock

  • Bolting of the ceiling and sidewalls

  • Consolidation injections

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