Foundation Systems
Hollow-Bar Micropiles
Simultaneous drilling and grouting for restricted-access foundations.
Hollow-bar micropiles combine drilling and grouting in one operation, enabling fast installation and reliable load transfer in challenging ground. Their compact installation equipment makes them well suited to restricted-access and low-headroom sites.
- High compression and tension capacity
- Suitable for variable ground
- Compact drilling equipment
- Low noise and vibration
- Minimal disturbance to structures
- Flexible lengths using couplers
- Fast simultaneous drill-and-grout process
- Good performance in restricted access
Technical data
- Range
- T30–T130
- System
- Hollow threaded bar with couplers
- Installation
- Simultaneous drilling and grouting
- Corrosion protection
- Hot Dip Galvanizing NS-EN-ISO 1461, Epoxy Coating NS-EN 13438
Applications
- Foundation underpinning
- New building foundations
- Bridge and infrastructure foundations
- Seismic strengthening
- Slope stabilization
- Tower and wind-turbine foundations
- Uplift and tension anchoring
- Restricted-access sites
Technical tables
T30 / T40 / T52 SERIES
| Hollow Bar | T30/16 | T30/14 | T30/11 | T40/20 | T40/16 | T40N/660 | T52/26 |
|---|---|---|---|---|---|---|---|
| Outside Diameter, OD (mm) | 30 | 30 | 30 | 40 | 40 | 40 | 52 |
| Inside Diameter, ID (mm) | 16 | 14 | 11 | 20 | 16 | 19 | 26 |
| Cross-Sectional Area (mm²) | 343 | 356 | 420 | 739 | 915 | 764 | 1274 |
| Ultimate Load (kN) | 220 | 260 | 320 | 540 | 660 | 660 | 929 |
| Load at 0.2% Yield (kN) | 180 | 220 | 260 | 430 | 525 | 525 | 730 |
| Weight (kg/m) | 2.70 | 2.80 | 3.3 | 5.80 | 7.18 | 6.00 | 10.0 |
T73 / T76 SERIES
| Hollow Bar | T73/56 | T73/53 | T73/45 | T73/35 | T76L | T76N | T76S |
|---|---|---|---|---|---|---|---|
| Outside Diameter, OD (mm) | 73 | 73 | 73 | 73 | 76 | 76 | 76 |
| Inside Diameter, ID (mm) | 56 | 53 | 45 | 35 | 56.5 | 51 | 45 |
| Cross-Sectional Area (mm²) | 1369 | 1681 | 2267 | 2675 | 1592 | 2076 | 2420 |
| Ultimate Load (kN) | 1035 | 1160 | 1575 | 1865 | 1300 | 1600 | 1900 |
| Load at 0.2% Yield (kN) | 830 | 970 | 1270 | 1430 | 1000 | 1200 | 1500 |
| Weight (kg/m) | 10.75 | 13.2 | 17.80 | 21.0 | 12.5 | 16.30 | 19.0 |
T103 / T127 / T130 SERIES
| Hollow Bar | T103/78 | T103/51 | T103/43 | T127 | T130 |
|---|---|---|---|---|---|
| Outside Diameter, OD (mm) | 103 | 103 | 103 | 127 | 130 |
| Inside Diameter, ID (mm) | 78 | 51 | 43 | 111 | 60 |
| Cross-Sectional Area (mm²) | 3223 | 5682 | 5987 | 3567 | 2076 |
| Ultimate Load (kN) | 2280 | 3660 | 4155 | 2400 | 7984 |
| Load at 0.2% Yield (kN) | 1800 | 2760 | 3400 | 1810 | 1200 |
| Weight (kg/m) | 25.3 | 44.6 | 47.0 | 28.0 | 16.30 |
The stated load values are theoretical nominal values based on the declared material properties and cross-sectional areas. Actual installed capacity depends on rock/ground conditions, borehole quality, grout bond, system components, installation and workmanship. Verify suitability by site-specific design and pull testing.
The stated T130 ultimate load of 7,984 kN is reproduced from the supplied chart and should be confirmed against the product certificate.
