G serieslattice steel mast
GB/T 25020 hot-dip galvanized Q235B/Q345
Specifications
| Model | G series, Gq straight-leg bridge masts series (certification25Model) |
|---|---|
| Standard | GB/T 25020, TB/T 2286 (steel masts for electrified railway OCS) Series standards |
| Operating Temperature | -40℃~+70℃ |
| Altitude | <4000m |
| Materials | Q235B/Q355Bsteel with hot-dip galvanizing, prestressed concrete, aluminium alloy (emergency repair) |
| Installation | direct burial/flange foundation installation, whole-mast erection |
Lattice steel masts are strong, collision-resistant, widely used on mainlines, stations and other high-load sections. Produced to the GB/T 25020 series national standard; G in the model denotes a lattice steel mast, with numbers for capacity (kN·m) and height (m).Q235B or Q345 steel is common, hot-dip galvanized (zinc coating at least 610g/m² when thickness is at least 5mm).
| Common models | Mast capacity(kN·m) | Mast height(m) | Notes |
|---|---|---|---|
| G50/9.5 | 50 | 9.5 | smaller capacity, heightlower mast |
| G150/13 | 150 | 13 | medium capacity and height, widely used |
| G200/15 | 200 | 15 | large capacity and height, for high-load locations |
certificationModelcovers
certificationModelcoversG seriesline masts ( capacity150~750kN·m, height13/15/20m) and Gq seriesstraight-leg bridge masts ( capacity80~200kN·m, height9~12.5m) — 25 models in total.
G series (14 models): G150/13, G200/13, G200/15, G250/13, G250/15, G300/15, G350/15, G400/15, G450/15, G500/15, G550/15, G600/15, G650/20, G750/20
Gq series (11 models): Gq80/9, Gq100/9, Gq120/9, Gq100/11.5, Gq120/11.5, Gq100/12, Gq120/12, Gq200/12, Gq100/12.5, Gq120/12.5, Gq200/12.5
| Standard | GB/T 25020 series |
| Structure type | Lattice (square tube, ring tube and H-section masts also available) |
| Main material | Q235B or Q345 grade steel |
| Corrosion protection | hot-dip galvanized, zinc coating at least 610g/m2 at 5mm thickness |
| Other model prefixes | Gs (double-track cantilever masts), Gz (narrow steel masts), Gq (straight-leg bridge masts, for bridge sections) etc. |
| Scope of application | mainlines, stations and other high-load sections |
Performance
Operating Conditions
for sections, station OCS support structures, bearing suspension load, wind load and ice load.
Mechanical Performance
Standard test bending moments meet the TB/T 2286 class series; hot-dip galvanizing lasts at least 30 years and concrete pole crack resistance is type-tested.
Electrical Performance
with earthing terminal, meeting mast earthing and stray-current protection requirements.
Applications
lattice steel masts on mainline sections G series are arranged by span and load on mainline sections.
Station throat areas:
lattice steel mast G series work with head-span beams in multi-track station areas.
Emergency repair:
lattice steel mast G series restore power supply quickly after storm-pole failures.
Corrosive environments:
lattice steel mast G series use thickened hot-dip galvanizing in coastal corrosive environments.
