Atlas Copco Hollow Bar Anchors

As the global redevelopment of urban areas continues, either by redesigning existing or by building new structures, the need for a cost-efficient method to stabilize structures in these sensitive areas is increasing.

MDTI has responded to the increasing industry need by offering the Atlas Copco Hollow Bar product lines to a certified dealer network.

The Atlas Copco anchoring systems can be used to stabilize slopes, support rocks at shallow or steep depths, prevent cave-ins, and offer tunnel support. With quick, efficient installation, it combines drilling, placing, and grouting all in one operation.

MDTI offers the Atlas Copco hollow bar injection-bore micropile that serves as an economical solution for challenging soil conditions where installing conventional micropiles may not be the best option. For example, those with collapsible soils (those not conducive to open-hole drilling), large boulders, or other obstructions.

The micropile is formed in a single, top-down operation by the injection of a high-pressure, neat cement grout mixture that is pumped through the bar, while also serving as the drill string. The neat grout mix exits through ports at the end of the sacrificial bit and permeates into the looser adjacent soils forming a competent reinforced grout column.

Solid Bar vs. Hollow Bar

With Solid Bar:

  • Predrilling required
  • Limited to shallow rock
  • Very stiff throughout soil strata
  • Casing needed in soft soils
  • Pre/Post grouting required
  • Several pieces of equipment

Using Atlas Copco Self-Drilling Hollow Bar Anchors:

  • No predrilling
  • Rock at any depth
  • Can be installed in all soil types
  • Casing for lateral loads
  • Grouting completed during install
  • Only need rock drill & grout plant

Hollow Bar Sacrificial Bits

The holes in each bit allow the grout/drilling solution to flow as the SDA is advanced, simultaneously creating the column.

  • Tungsten Carbide Button Bit for hard rock (Limestone, shale)
  • Tungsten Carbide Cross Cut Bit for softer rock (sandstone, soft shale, or fractured rock)
  • Clay Bit ideal for mixed fills and clay

Atlas Copco Self Drilling Anchor Rod Specificiations

Bar NumberR32SR38NR51NT76S
O.D (in)1.261.52.012.99
I.D (in)0.590.751.291.77
Area (in2)0.761.111.453.72
Ultimate Load, Pu (kip)80.93112.4179.8427.14
Yield Load, Py (kip)62.9589.92141.6337.21
Ultimate Stress, Fu (ksi)107.33101.53121.8114.58
Yield Stress Fy (ksi)82.6778.3297.1891.37
Weight (lbs/ft)2.764.035.6413.24