Hollow Bar (SDA) System for Micropiles, Anchors & Soil Nails

Self-drilling hollow bar installs drill + grout in one pass for unstable or loose soils. We supply bars, carbide bits, couplers, plates, centralizers, and grout hardware, matched to your spec and schedule.

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Quick selector

Unstable/loose soils or speed needed → Choose Hollow Bar (SDA)
Spec requires solid bar or permanent casing → Choose Threaded Bar
Not sure? Send soil, loads, diameters, and schedule—we’ll recommend the best fit.

Where it’s used

Micropiles (compression/tension; constrained sites; low blow counts)
Ground Anchors / Tiebacks (temporary/permanent, depending on spec)
Soil Nails (cuts, shotcrete walls)

What we supply

Hollow Bar (SDA) String: common series for geotech work (project-matched)
Drill Bits: clay/sand/rock, carbide options; diameters matched to bar/soil
Couplers & Adapters: system-matched; adapters for rigs/rods as needed
Plates & Hardware: bearing/cap/nail plates, washers
Centralizers/Spacers: to maintain annulus and grout cover
Grout Hardware: tubes, packers, valves/fittings for injection/testing
Casing (if specified): temporary/permanent; plain/threaded ends
Documentation: cut sheets, product data, sample submittals; MTRs when available per mill/spec
Coatings (as required): HDG/prime/epoxy for plates, casing, and hardware (hollow bar typically supplied bare unless spec requires otherwise)

If you need rope/R-thread adapters for casing/rigs, we can supply them.

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Typical packages

Micropile (SDA): Hollow bar + bit + couplers + plates + centralizers + grout hardware
Anchor (SDA): Hollow bar + bit + couplers + bearing plate + grout hardware
Soil nail (SDA): Hollow bar + bit + couplers + nail plate + spacers + grout hardware

Quote checklist

Use: Micropile / Anchor / Soil nail
Design: target loads, bar/bit diameters, length(s), couplers
Soil info: loose/soft/clayey/sandy, groundwater if known
Plates: L×W×T, holes/countersunk (attach sketch if possible)
Centralizers: spacing (if specified)
Casing: Y/N, size, end finish (if required)
Coatings (for hardware/plates/casing): HDG / Prime / Epoxy
Project: quantities, city/state, needed-by date; docs (submittals, MTRs)

FAQs

1. When should I choose SDA vs. threaded bar? Use SDA in unstable or loose soils and when speed matters (drill + grout in one pass). Choose threaded bar when specs require solid bar or permanent casing.

2. Do you supply bits and rig adapters? Yes—clay/sand/rock and carbide bits, plus system-matched couplers and adapters.

3. Can you provide plates, centralizers, and grout hardware? Yes—bearing/cap/nail plates, plastic/steel centralizers, and injection/testing hardware.

4. Do you offer coatings? Yes—HDG, prime, epoxy for plates, casing, and hardware (per spec). Hollow bar itself is typically supplied bare unless specified otherwise.

5. Lead times? Core sizes/bits are often quick; special bits, coatings, custom plates, or casing can add time.