Home » Products » Four-Legged Angular Tower

Product Category

Four-Legged Angular Tower


Availability:

Quantity:



Inquire Add to Basket

Tube Tower Angel Steel Tower Telecom Tower Power Tower Solar Mount

Product Description

A Four-Legged Angular Tower (also known as a Four-Legged Angular Steel Lattice Tower) is a self-supporting vertical structure characterized by four main vertical legs made of angle steel (L-shaped sections) arranged in a square or rectangular configuration. The legs are interconnected by horizontal and diagonal bracing members (also typically angle steel) via bolted gusset plates, forming a rigid lattice truss system. The structure tapers from a wider base to a narrower top to optimize load distribution and resist overturning forces.

It is one of the most traditional, robust, and widely used tower types for power transmission, telecommunications, broadcasting, and observation applications worldwide.

Key Structural Features

Feature	Description
Configuration	Square/rectangular cross-section with four main angle steel legs.
Material	Hot-rolled structural angle steel (e.g., Q235B, Q355B, Q420; equivalent to ASTM A36, A572 Gr.50, S355JR).
Connections	Bolted connections (Grade 4.8, 6.8, 8.8 / ASTM A325, A490) through gusset plates; no welding required on site.
Surface Treatment	Hot-Dip Galvanizing per ASTM A123 / ISO 1461 (≥65–86 μm thickness) for 20–50 year corrosion protection.
Height Range	Commonly 10 m – 120 m (customizable up to 150 m+ for special projects).
Design Loads	Engineered for high wind speeds (up to 250–330 km/h), ice loads, seismic activity, and heavy equipment payloads.

Advantages

Superior Stability & Rigidity: The four-leg square frame provides excellent torsional resistance and lateral stability, minimizing twist and deflection under asymmetric wind or antenna loads (critical for microwave links).

High Load Capacity: Supports heavier multi-operator antenna arrays, large dishes, platforms, and power conductors compared to three-legged or tubular alternatives.

Structural Redundancy: Multi-path load distribution means greater safety margin; failure of one member is less likely to cause catastrophic collapse compared to simpler structures.

Proven Economy at Scale: While using more steel than three-legged towers, it offers the best cost-to-strength ratio for medium-to-high heights (50–120m) and heavy-duty applications.

Terrain Adaptability: Four independent foundations allow adjustment for uneven ground; suitable for mountains, soft soil, and seismic zones.

Easy Maintenance & Access: Symmetrical layout facilitates safe climbing (internal/external ladders, cages) and equipment installation on multiple faces.

Common Applications

Telecommunications: 4G/5G macrocell sites, urban telecom hubs, microwave backhaul stations with multiple co-located operators.

Broadcasting: TV/FM radio transmission towers requiring high elevation and stable platforms.

Power Transmission: Medium-to-high voltage lines (110kV – 500kV+), especially for long-distance grid interconnection and substation exits.

Surveillance & Observation: Weather monitoring, border security, aviation navigation aids.

Emergency Response: Rapid-deployment rigid structures for disaster relief communication.

Design Standards

Four-legged angular towers are typically designed and verified per:

TIA-222-G/H (Structural Standard for Antenna Supporting Structures)

ASCE 10 (Design of Latticed Steel Transmission Structures)

EN 1993-3-1 (Eurocode 3 – Towers, Masts, Chimneys)

IEC 60826 (Design Criteria for Overhead Transmission Lines)

AWS D1.1 (Structural Welding Code – Steel)

Typical Components

1. Main Legs: Continuous angle steel sections spliced at panel points.

2. Bracing System: Diagonal (X or K-type) and horizontal members forming lattice panels.

3. Gusset Plates: Connection nodes joining legs and braces.

4. Base Plates & Anchor Bolts: Secure the tower to concrete foundations.

5. Accessories: Working/rest platforms, climbing ladder with safety cage/fall arrest, cable trays, antenna brackets, aviation obstruction lights, lightning rod & grounding kit.

Comparison: Four-Legged vs. Three-Legged Angular Tower

Aspect	Four-Legged Angular Tower	Three-Legged Angular Tower
Base Shape	Square / Rectangular	Equilateral Triangle
Stability	Superior (torsional rigidity)	Moderate
Load Capacity	High (multi-operator, heavy)	Medium (single operator, light)
Typical Height	50–120 m+	30–60 m
Footprint	Larger (16–64 m²)	Smaller (3–14 m²)
Steel Consumption	Higher	~30–40% less
Cost	Moderate–High	Lower (economical)
Best For	Urban, high-wind, tall, heavy load	Rural, space-limited, budget-sensitive