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.
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
Components of the Magnacore Self-Drilling Anchor
- Hex Nut
- Termination Plate for new construction or bracket for underpinning
- HDPE Pipe for unbonded length or additional corrosion protection
- Soil Cement Grout Body
- Final Injection Grout
- Magnacore Self-Drilling Anchor Bar allows injection while serving as drill string
- Coupler
- Centralizer to keep the micropile centered in the hole to allow for optimal grout cover
- Sacrificial Bit
- 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
