1. Main materials of bridge

Galvanised steel (steel bridge): low cost, high strength, need anti-corrosion treatment (hot dip galvanised/cold galvanised).

Stainless steel (304/316): corrosion resistant, suitable for chemical and marine environment.

Aluminium alloy: lightweight, oxidation resistant, commonly used in data centres, clean plants.

Fibreglass reinforced plastic (FRP): insulation, acid and alkali resistance, suitable for special corrosive environments.

2. Bridge processing technology flow

(1) Unloading

Use shearing machine or laser cutting machine to cut the plate into required size (width, length).

Key parameters: cutting accuracy (±0.5mm), edge burr treatment.

(2) Punching/Pressing

Punching: Punching machine is used to make holes on the side or bottom plate of the bridge (for heat dissipation or fixing cables).

Pressing: Process the flat plate into channel, step or tray type bridge by bending machine or roll forming machine.

Common types:

Trough type bridge: fully closed structure, dustproof and anti-interference.

Trapezoidal bridge: open structure, good heat dissipation.

Tray type bridge: bottom punching, both heat dissipation and protection.

(3) Bending moulding

Use hydraulic bending machine to bend the side of the bridge into 90° or other angles to form U-type or C-type section.

Key control: bending angle error (± 1 °), to avoid cracking of the plate (especially aluminium alloy).

(4) Welding (part of the bridge)

Welding (e.g. CO₂ protection welding) on the interface or connection parts that need to be strengthened.

Note: Stainless steel bridges need to be argon arc welded to avoid intergranular corrosion.

(5) Surface treatment

Galvanised bridge:

Hot-dip galvanising: zinc dip treatment, strong corrosion resistance (zinc layer ≥ 65μm).

Electro-galvanised: low cost, but the zinc layer is thin (8~12μm), suitable for indoor dry environment.

Plastic spraying bridge: electrostatic spraying epoxy resin powder, the colour is optional (such as grey, white), beautiful and weather-resistant.

Anodic oxidation (aluminium alloy bridge): to enhance surface hardness and corrosion resistance.

(6) Assembly and Connection

Splicing bridge segments into a continuous system using connecting tabs, bolts or clips.

Accessory processing: brackets, elbows, tees, etc. need to be matched with stamping and moulding.

3. Key quality control points

Dimensional accuracy:

Width and height deviation ≤±2mm, length deviation ≤±5mm.

Load-bearing capacity:

Need to comply with national standards (such as JB/T 10216), through the load test (such as uniform load ≥ 1.5kN / m).

Anti-corrosion performance:

Salt spray test (hot-dip galvanising ≥ 96 hours without white rust, plastic spraying ≥ 500 hours without peeling).

Fire resistance performance:

Fireproof bridge need to pass the fire resistance test (such as GB 8624 standard).