Magnacore Self-Drilling Anchors

The Magnacore® Self Drilling Anchor (SDA) from Intech Anchoring is a 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.

Magnacore micropiles warehouse

Solid Bar Compared to Hollow Bar

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

Magnacore SDA Hollow Bar

  • 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

Magnacore Applications

  • New construction
  • Underpinning
  • Settlement/stabilization
  • Earth retention
  • Slope stabilization
  • Tunneling

Benefits of SDAs

  • Difficult soil conditions
  • High installation rate
  • Limited access
  • No casing required
  • Extra corrosion protection
  • Decreased labor & material cost
Download Brochure

Components of the Magnacore Self-Drilling Anchor

  1. Hex Nut
  2. Termination Plate for new construction or bracket for underpinning
  3. HDPE Pipe for unbonded length or additional corrosion protection
  4. Soil Cement Grout Body
  5. Final Injection Grout
  6. Magnacore Self-Drilling Anchor Bar allows injection while serving as drill string
  7. Coupler
  8. Centralizer to keep the micropile centered in the hole to allow for optimal grout cover
  9. Sacrificial Bit
  10. Grout Flushing Holes

Magnacore 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

How to Install Magnacore from Intech

Magnacore Specifications

U.S. Measurements

Bar Type R32S R38N R51N T40/20 T40/16 T52/26 T76S Unit
Outer Dia 1.26 1.50 2.01 1.57 1.57 2.05 2.99 in.
Inner Dia 0.59 0.71 1.18 0.79 0.63 1.02 1.77 in.
Area 0.79 1.17 1.78 1.22 1.42 1.92 3.90 in2
Ultimate Tensile Load (Pu) 80.93 123.60 179.80 121.17 148.40 208.80 427.10 kip
Yield Load (Py) 62.90 101.20 141.60 96.66 118.00 164.10 337.20 kip
Ultimate Tensile Stress (Fu) 102.27 105.93 101.01 98.96 104.17 108.83 109.60 ksi
Yield Stress (Fy) 79.55 86.67 79.55 78.95 82.86 85.52 86.53 ksi
Weight 2.69 3.97 6.06 4.17 4.85 6.53 13.26 lb/ft

Metric

Bar Type R32S R38N R51N T40/20 T40/16 T52/26 T76S Unit
Outer Dia 32 38 51 40 40 52 76 mm
Inner Dia 15 18 29 20 16 26 45 mm
Area 510 755 1148 787 916 1239 2516 mm2
Ultimate Tensile Load (Pu) 360 550 800 539 660 929 1900 kN
Yield Load (Py) 280 450 630 430 525 730 1500 kN
Ultimate Tensile Stress (Fu) 706 729 697 685 720 750 755 n/mm2
Yield Stress (Fy) 549 596 549 546 573 589 596 n/mm2
Weight 4.00 5.90 9.00 6.20 7.20 9.70 19.70 kg/m

Why Intech Anchoring?

In addition to materials and service, Intech Anchoring will provide continual support through the entire project, including engineering/design, on-site support, load testing, installation expertise, competitive pricing, and rental equipment.

Call us at 800-223-7015 for more information or to receive a custom product quote.