Heavy Duty Transmission Tower

Heavy Duty Transmission Tower is the core load-bearing steel structure for high-voltage, extra-high-voltage and ultra-high-voltage overhead transmission lines. Heavy Duty Transmission Tower is mostly constructed as a space-truss lattice angle-steel structure, with main materials adopting high-strength low-alloy steel such as Q355B and Q420B. It is applicable to AC transmission projects of 110kV-1000kV and DC transmission projects of ±800kV and above.

Heavy Duty Transmission Tower is mainly classified into suspension tower, strain tower, angle tower, crossing tower, terminal tower and other types. Designed to support transmission conductors, lightning-protection wires and OPGW optical cables for long-distance electric power transmission, the tower can operate stably for a long time under harsh and complex working-condition environments including plateaus, coastal areas, heavy-ice-covered zones and strong-wind regions.

Full‑process production in strict accordance with GB/T 2694-2018 Technical Conditions for Manufacturing of Transmission Line Towers:

 

• Raw Material Inspection: Re‑inspect material certificates, mechanical properties and chemical composition of incoming steel.

• 3‑D Lofting & Blanking: 3‑D modeling and lofting by Tekla and other software, followed by CNC cutting‑off.

• Hole‑making Processing: Holes are drilled by CNC drilling machines. The precision of hole‑position is strictly controlled to ensure bolt fitting.

• Welding Procedure: Gas‑shielded welding is adopted for key components such as tower base plates and connection plates, with weld seam inspection by flaw detection.

• Hot‑dip Galvanizing for Anti‑corrosion: Process flow including pickling, fluxing, hot‑dip galvanizing, cooling and passivation, to meet the required zinc‑coating thickness.

• Pre‑assembly Test in Factory: Full‑scale trial assembly of the complete tower before delivery to eliminate component mismatching problems.

• Numbering, Packing & Shipment: Each component is marked with a unique identification number and bundled and packed by category.

• Drawing Customization: Tower structural design is completed according to the client's line‑load report, voltage class, wind speed, ice‑coating thickness, seismic intensity and terrain conditions. Manufacturing and production can also be carried out based on drawings supplied by customers.
• Material Customization: High‑strength steel grades Q235B, Q355B and Q420 are optional; low‑temperature resistant steel is adopted for low‑temperature service conditions.
• Specification Customization: Tower type, height, circuit quantity and suspension‑point configuration can all be adjusted as required. Complete sets of accessories are supplied, including anchor bolts, connecting bolts and anti‑theft bolts.
• Standard Customization: Domestic and international technical standards such as GB (Chinese National Standard), IEC, GOST and TIA‑222‑G can be implemented to meet the export requirements of overseas projects.
• Supporting Services: Technical consultation, drawing joint review, factory pre-assembly test and on‑site installation technical guidance are provided.

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