EarthGrid, a company developing advanced tunneling technology, recently demonstrated its plasma tunnel boring machine (TBR) in California, successfully chewing through three meters of granite. The machine utilizes three plasma torches that generate temperatures reaching 27,000 degrees Celsius, hotter than the surface of the sun, to melt rock. This process creates a vortex that helps to expel debris, sometimes in molten form.
During the January test, the cigar-shaped machine, which is about four to five feet across, created a tunnel in the solid rock. The company aims to refine the machine's directional control, as it slightly over-bored to the top and left of the intended tunnel. Future adjustments will involve altering the vortex's spin direction to improve accuracy, with the goal of commercial deployment as early as next year.
This emerging technology could significantly reduce the cost and difficulty associated with placing critical infrastructure, such as electricity and telecommunications cables, substations, and data centers, underground. Engineering firms are reporting an increase in demand for undergrounding solutions. This trend is partly attributed to the war in Ukraine, which has highlighted the vulnerability of above-ground facilities to attacks.
EarthGrid's founder and chief executive, Troy Helming, noted that interest has been expressed by companies looking to use the TBR for various purposes. These include laying power and fiber optic cables, as well as pipelines for transporting resources like water, natural gas, or ammonia. One proposed project involves using the machine to create tunnels for an underground freight-distribution system around airports and warehouses, aiming to reduce the number of trucks on roads.
The concept of undergrounding infrastructure is not new, with existing tunnel systems used for power and utilities in some urban areas. However, the efficiency and speed offered by technologies like EarthGrid's plasma boring machine could make it a more viable option for a wider range of applications. The company's progress in developing and testing this technology suggests a potential shift in how essential services and infrastructure are secured and deployed in the future.
