Angular Steel Power Transmission Tower

Angular Steel Power Transmission Tower
Angular Steel Power Transmission Tower
Angular Steel Power Transmission Tower
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Self-supporting lattice tower constructed from angular steel members for power transmission lines, available in height options from 5 to 60 meters

Angular steel power transmission towers are self-supporting structures built with hot-dip galvanized angle steel. They are widely used in power transmission corridors, substation extensions, and other electrical infrastructure projects. The design provides reliable strength for high-voltage applications and performs well in long-term outdoor conditions.

  • Design Standard ANSI/TIA-222-G/H/F; EN 1991-1-4; EN 1993-3-1
  • Height Range 5–60 m, customizable according to project requirements
  • Design Wind Speed Up to 300 km/h, adjusted according to site conditions
  • Surface Treatment Hot-dip galvanized
Structural Design
  • Main Materials
    The tower is built with hot-dip galvanized angle steel with a zinc coating thickness of at least 85 μm. This treatment provides more than 30 years of salt-spray resistance. The material delivers compressive strength above 350 MPa, ensuring stable performance under heavy loads.
  • Connection Method
    Components are secured with bolted connections. Certain sections use a modular design, such as X-shaped reinforcement plates and dual-stage spring dampers that help improve vibration control and structural stability.
  • Specification Optimization
    Large-section single-leg angle steel reduces the number of bolts and filler plates needed during assembly. This simplifies installation and increases overall construction efficiency.
  • Wind and Seismic Performance
    The energy transmission line tower is designed for wind speeds up to 30 m/s. It meets seismic requirements for intensity level 8, with a maximum displacement of no more than 3.2 mm under level-6 seismic conditions. This ensures dependable performance across a wide range of environments.

Typical Installation Environments
The installation of angular steel transmission line towers requires careful consideration of soil conditions, wind exposure, and local climate. Different terrains call for specific precautions to ensure long-term structural stability.

  • Plains
    Plains usually provide firm soil, but soft ground should be avoided. The foundation must support both the tower weight and the tension of the conductors, with enough bearing capacity for long-term operation.
  • Mountain Areas
    Sites prone to landslides or debris flow should be excluded. Stable geological zones are preferred to keep the tower secure and reduce maintenance risks.
  • Coastal Regions
    Tidal forces and wave impact on the foundation must be taken into account. The tower should offer strong wind resistance and reliable corrosion protection to withstand the coastal environment.
Product Power transmission tower
Safety Factor Safety factor for conductors: 2.5-4.0; Safety factor for grounding: 2.5-4.0
Ultimate Tensile Strength 490kpa-620kpa
Tolerance of dimension ±2%
Manufacturing Standard GB/T 2694-2018
Quality Certification ISO 9001: 2015; COC; Third Party Inspection Report (SGS, BV)
Nuts & Bolts Grade 8.8/6.8/4.8; A325, DIN7990, DIN931, DIN933; ISO4032, ISO4034
Main Material Q235B/Q355B/Q420B Angle Steel
Height Range 5–60 m, customizable according to project requirements
Design Wind Speed Up to 300 km/h,adjusted according to site conditions
Surface Treatment Hot-dip galvanized
Galvanizing Standard ASTM A123/ ISO 1461
Expected Service Life More than 20 years
Color Options Silver (galvanized) or painted finish, RAL color system, customizable
Seismic Resistance Up to 8° seismic intensity
Appropriate Temperature −60° to 60°
Rated Voltage: 10kV, 33kV, 66kV, 110kV, 132kV, 220kV, 380kV, 400kV, 500kV, 750kV, 1000kV
Welding Welding complies with AWS D1.1. CO₂ welding or submerged-arc automatic welding with no fissures, overlap, or defects;internal and external welds provide a uniform finish.
Base Plate Square, round, or polygonal base plate with slotted holes for anchor bolts;dimensions customizable per project requirements
Certification Standard
Design Standards
  • TIA/EIA-222-G/H/F
  • EN 1991-1-4
  • EN 1993-3-1
  • 3-second gust wind speed
  • North American (EIA,UBC,CSA) Standards
  • European (Eurocode)
Structural Steel
Grade Mild Steel High Tensile Steel
GB/T 700 – Q235B, Q235C, Q235D GB/T 1591 – Q355B, Q355C, Q355D, Q420B
ASTM A36 ASTM A572 Gr.50
EN 10025 – S235JR,S235J0,S235J2 EN 10025 – S355JR,S355J0,S355J2
   
Design Wind Speed Up to 300 km/h
Allowable deflection 0.5–1.0° @ operational speed
Tensile strength (MPa) 360–510 470–630
Yield strength (t ≤ 16 mm) (MPa) 235 355 / 420
Elongation (%) 20 24
Impact strength KV (J) 27 (20°C) - Q235B (S235JR) 27 (20°C) - Q355B (S355JR)
27 (0°C) - Q235C (S235J0) 27 (0°C) - Q355C (S355J0)
27 (-20°C) - Q235D (S235J2) 27 (-20°C) - Q355D (S355J2)
Bolts & Nuts
Grade Grade 4.8, 6.8, 8.8
Standards for mechanical properties
Bolts ISO 898-1
Nuts ISO 898-2
Washers ISO 7089 / DIN 125 / DIN 9021
Standards for dimensions
Bolts (dimensions) DIN 7990,DIN 931,DIN 933
Nuts (dimensions) ISO 4032,ISO 4034
Washers (dimensions) DIN 7989,DIN 127B,ISO 7091
Welding
Method CO₂ Shielded Arc Welding & Submerged Arc Welding (SAW)
Standard AWS D1.1
Galvanizing
Galvanization standard of steel sections ISO 1461 or ASTM A123/A123M
Galvanization standard of bolts and nuts ISO 1461 or ASTM A153/A153M

Main & Optional Components

  • Anchor Bolts
  • Copper Grounding Material
  • Connection Plates
  • Accessory Bolts
Project Application Examples
Manufacturing Process

Laser Cutting
Laser cutting is used to shape the steel components through focused beam cutting and assisted gas removal. The process offers fast cutting speed and high dimensional accuracy (up to ±0.05 mm), while keeping heat impact to a minimum. This reduces the risk of deformation and results in clean, well-defined edges.

CNC Punching and Shearing
Steel angles are processed through CNC-controlled punching and shearing lines. Automatic feeding, positioning, punching, and cutting are all integrated into the process, keeping production running smoothly and efficiently. Precise CNC positioning keeps quality consistent, even when working with more complex parts.

Hot-Dip Galvanizing and Surface Protection
The tower is protected with hot-dip galvanizing as the main anti-corrosion treatment, along with an extra plastic coating for added protection. The zinc layer protects the steel from rust and adds strength, while the coating gives extra insulation and surface protection. This combined treatment allows the tower to maintain reliable performance for over 20 years and adapt well to harsh environments such as high and low temperatures, coastal areas, and mountainous regions.

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