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A Four-Legged Tubular Tower is a self-supporting lattice steel structure characterized by four vertical steel tube columns arranged in a square or rectangular configuration. Unlike traditional angular (angle steel) lattice towers, the main legs and often the bracing members are constructed from hollow steel tubes (circular or polygonal sections). The structure tapers from a wider base to a narrower top and is anchored to a reinforced concrete foundation via anchor bolts.
It combines the structural rigidity of lattice framing with the aerodynamic advantages of tubular members, making it a hybrid between a Monopole Tower and a Traditional Lattice (Angular) Tower.
Feature | Description |
Configuration | Square-base, four main tubular legs with horizontal/diagonal bracing (tubular or angular). |
Material | High-strength carbon steel (e.g., Q235B, Q355B, Q420, or ASTM A36, A572 Gr.50, S355). |
Connections | Flanged joints for leg sections; bolted gusset plates for bracing (ISO/DIN/AWS standards). |
Surface Treatment | Hot-Dip Galvanizing (ASTM A123 / ISO 1461), typically ≥65–86 μm thickness for 25–50 year lifespan. |
Height Range | Commonly 10 m – 120 m (customizable based on load and site conditions). |
Design Wind Speed | Up to 300 km/h (167 mph) depending on geographical/seismic criteria. |
Aerodynamic Efficiency: Tubular members have a smooth surface with ~30% lower wind drag coefficient than angle steel, improving performance in high-wind or coastal areas.
Compact Footprint: Smaller base area compared to traditional angular lattice towers; suitable for space-constrained urban or hilly sites.
High Load Capacity: The four-leg square configuration provides excellent overturning resistance and can support heavy multi-operator antenna arrays, microwave dishes, and platforms.
Reduced Component Count: Tubular construction simplifies the truss system, reducing fabrication, handling, and on-site assembly time vs. complex angle steel towers.
Durability & Aesthetics: Galvanized tubular surfaces resist corrosion better and present a cleaner visual profile than open-angle frameworks.
Telecommunications: 4G/5G macrocell bases, microwave relay stations, broadcast antennas.
Power Transmission: Medium-to-high voltage distribution lines (especially in visually sensitive areas).
Surveillance & Meteorology: Weather monitoring stations, security camera masts.
Hybrid Infrastructure: Smart city poles integrating lighting, sensors, and comms equipment.
Four-legged tubular towers are typically engineered per:
TIA-222-G/H (Structural Standard for Antenna Supporting Structures)
EN 1993-3-1 (Eurocode 3 – Towers, Masts, Chimneys)
ASCE 10 (Design of Latticed Steel Transmission Structures)
IEC 60826 (Design Criteria for Overhead Transmission Lines)
AWS D1.1 (Welding Code – Structural Steel)
1. Tubular Main Legs: Tapered or straight steel pipes connected via flanges or slip joints.
2. Bracing Members: Horizontal/diagonal steel tubes or angles bolted to connection plates.
3. Foundation Bolts: High-strength anchor rods (Grade 8.8 / A325) securing the base to concrete.
4. Platforms: Rest/platform decks for antenna mounting and maintenance access.
5. Auxiliary Systems: Internal/external ladder, safety cage, cable tray, lightning rod, grounding kit.
