What is grain bridging and where does it occur?

Grain bridging occurs when material, such as grain, forms a bridge or arch above an area, typically within storage vessels like grain bins. This phenomenon can create significant hazards as it may lead to sudden collapses and blockages if the bridge breaks, releasing the stored grain dramatically and unpredictably. This is a particularly acute risk in grain bins, where movement and flow of granular materials under gravity can be influenced by moisture content and particle size.

When bridging happens, it can prevent the grain from flowing properly toward the auger or outlet, which can create a dangerous situation for workers who may attempt to clear blockages or free entrapped grain without understanding the risks of collapsing structures. This makes it crucial for those who work with grain bins to be aware of the signs of grain bridging and to follow proper safety practices to mitigate risks associated with stored grain. Understanding these risks helps maintain a safe working environment in agricultural settings where grain is stored and processed.