| Customization: | Available |
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| Usage: | Flying Angle Tower, Crossing Tower, Tension Tower, Angle Tower, Terminal Tower |
| Conductor Circuit: | Double Circuit |
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Steel poles can provide advantages for high-voltage lines, where taller poles are required for enhanced clearances and longer span requirements. Tubular steel poles are typically made from 11-gauge galvanized steel, with thicker 10- or 7-gauge materials used for some taller poles because of their higher strength and rigidity. For tall tower-type structures, 5-gauge materials are used.
Although steel poles can be drilled on-site with a annular drill bit or standard twist drill, it is not a recommended practice. As with concrete poles, bolt holes could be built into the steel pole during manufacture for use as general attachment points or places for steps to be bolted into the pole.
Welding of attachment hardware or attachment ledges to steel poles may be a feasible alternate approach to help provide reliable attachment points. However, operational and practical hazards of welding in the field may make this process undesirable or uneconomical.
Steel poles should meet industry specifications such as: TIA/EIA-222-G, Structural Standard for Antenna Supporting Structures and Antennas (current); TIA/EIA-222; Structural Standards for Steel; and TIA/EIA-RS-222, or an equivalent requirement set to help ensure a robust and good quality pole is being used.
| Design | ||
| TIA/EIA-222-G/F | ||
| Structure Steel | ||
| Mild Steel | High Tensile Steel | |
| GB/T 700:Q235B, Q235C,Q235D | GB/T1591:Q345B, Q345C,Q3455D,Q420 | |
| ASTM A36 | ASTM A572 Gr50 | |
| EN10025: S235JR, S235J0,S235J2 | EN10025: S355JR, S355J0,S355J2 | |
| Up to 250 km/h | ||
| 0.5 ~1.0 degree @ operational speed | ||
| 360~510 | 470~630 | |
| 355 | 235 | |
| 20 | 24 | |
| 27(20°C)---Q235B(S235JR) | 27(20°C)---Q345B(S355JR) | |
| 27(0°C)---Q235C(S235J0) | 27(0°C)---Q345C(S355J0) | |
| 27(-20°C)---Q235D(S235J2) | 27(-20°C)---Q345D(S355J2) | |
| Bolts & Nuts | ||
| Grade 4.8, 6.8, 8.8 | ||
| 10. Standards for mechanical properties | ||
| ISO 898-1 | ||
| ISO 898-2 | ||
| ISO 6507-1 | ||
| 11. Standards for Dimensions | ||
| DIN7990, DIN931, DIN933 | ||
| ISO4032, ISO4034 | ||
| DIN7989, DIN127B, ISO7091 | ||
| Welding | ||
| CO2 Shielded Arc Welding & Submerged Arc Welding(SAW) | ||
| AWS D1.1 | ||
| Galvanizing | ||
| ISO 1461 or ASTM A123 | ||
| ISO 1461 or ASTM A153 | ||
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