When Hy-Rib is used with the ribs running vertically, the supports (walings) will be placed horizontally. This arrangement usually occurs on deep stop-ends. The method of supporting the walings can vary, from propping off the slab as single faced forms, by securely attaching to the reinforcement, or by tie rods passing through the pour. Typical examples of its use on deep stop ends are shown at Figures 9 and 10 which assume that restraint to the vertical soldiers is by tie rods, connected to suitable restraints. In all cases, the span of the Hy-Rib will vary according to the concrete pressure. The Table below gives the safe clear vertical distance between the horizontal supports (walings) for different concrete pressures.
Safe clear span of Hy-Rib fitted vertically between supports
| Concrete Pressure | Safe clear vertical distances between the Hy-Rib supports |
|||
| Theoretical * Table2 CIRIA 108 |
assummed for Hy-Rib |
Grade 2411 |
Grade 2611 |
Grade 2811 |
| kN/m² | kN/m² | mm | mm | mm |
| 6.25 | 3.20 | 1050 | 850 | 800 |
| 12.50 | 6.30 | 750 | 600 | 575 |
| 18.75 | 9.50 | 625 | 500 | 475 |
| 25.00 | 12.70 | 525 | 425 | 400 |
| 31.25 | 15.80 | 475 | 375 | 350 |
| 37.50 | 19.00 | 425 | 350 | 325 |
| 50.00 | 25.30 | 375 | 300 | 275 |
| 62.50 | 31.70 | 350 | 275 | 250 |
| 75.00 | 38.00 | 325 | 250 | 225 |
| 100.00 | 38.00 | 325 | 250 | 225 |
| 125.00 | 38.00 | 325 | 250 | 225 |
| 150.00 | 38.00 | 325 | 250 | 225 |
| 175.00 | 38.00 | 325 | 250 | 225 |
When Hy-Rib is used with the ribs running vertically, the supports (walings) will be placed horizontally. This arrangement usually occurs on deep stop-ends. The method of supporting the walings can vary, from propping off the slab as single faced forms, by securely attaching to the reinforcement, or by tie rods passing through the pour. Typical examples of its use on deep stop ends are shown at Figures 9 and 10 which assume that restraint to the vertical soldiers is by tie rods, connected to suitable restraints. In all cases, the span of the Hy-Rib will vary according to the concrete pressure. The Table below gives the safe clear vertical distance between the horizontal supports (walings) for different concrete pressures. Safe clear span of Hy-Rib fitted vertically between supports Concrete Pressure Safe clear vertical distances between the Hy-Rib supports Theoretical * Table2 CIRIA 108 assummed for Hy-Rib Grade 2411 Grade 2611 Grade 2811 kN/m2 kN/m2 mm mm mm 6.25 3.20 1050 850 800 12.50 6.30 750 600 575 18.75 9.50 625 500 475 25.00 12.70 525 425 400 31.25 15.80 475 375 350 37.50 19.00 425 350 325 50.00 25.30 375 300 275 62.50 31.70 350 275 250 75.00 38.00 325 250 225 100.00 38.00 325 250 225 125.00 38.00 325 250 225 150.00 38.00 325 250 225 175.00 38.00 325 250 225
The properties assume that the Hy-Rib is used with the ribs pointing into the concrete to be placed, and spanning in the strong direction between the supports with the ribs parallel with the span. The Hy-Rib face is nominally vertical. It is assumed that the Hy-Rib is simply supported. Even if the Hy-Rib is spanning over several horizontal supports (walings), its lower bending strength at the support is such that it will yield as the design concrete pressure is applied, making the bending at mid-span more critical when analysed as a simply supported member.
