Grate Loading – Dynamic

Dynamic Loading

Typical loading standards for trench drains only address the static load or vertical load put on a grate. However, the linear nature of trench drains subject them to forces and loads that point inlets and catch basins are just not subjected to. It is these dynamic loads that typically destroy the integrity of a trench drain.

When considering a Trench Drains for any application, it should also be treated as an assembly (grates, frames, trench conduit). The weakest member in any system is your maximum design load.

Examples of Dynamic Loads

  • Turning Forces
  • Braking Forces
  • Cyclic Loading (high speed repetitive traffic)
  • Snow Plows

Load ClassLoad ClassLoad Class
ApplicationNo Dynamic LoadLow Speed Dynamic High Speed Cyclic and/or High Speed Dynamic
Anchor FrameNot Required Independent Anchor FrameIndependent Anchor Frame
Preferred Grate MaterialALL
Ductile Iron ASTM A-536 65-45-12 or 80-55-06
Ductile Iron ASTM A-536 65-45-12 or 80-55-06
Grate Anchor MechanismBolted or Toggle Bolted, Toggle, or Boltless Boltless or Bolted (if picture framed)
Modulus SandwichAllowed Not Allowed Not Allowed
Typical ApplicationsWalkways, Pedestrian Local Roadways, Maintenance GaragesPorts, Airports, Highways