When spraying concrete on a freshly excavated section of tunnel, noise produced from the compressed air concrete stream combined with the excessive dust are key health issues issues for the nozzlemen and other members of the spraying team that need to be addressed.
Fresh air supply and dedusting extraction ventilation systems help but it is necessary to protect the personnel at the tunnel “face” with Versaflow respiratory protective equipment. This RPE covers the head and face making communications between engineer, nozzleman and pumpman difficult.
To eliminate hearing damage and improve communication, the spraying team within each tunnel gang have been provided with custom-fit ear plugs with built-in micro speakers connected to motorcycle bluetooth headsets which are worn under the Versaflow helmets. This allows the sprayiing team to communicate clearly with one another whilst being effectively protected from noise and dust.
Entry submitted by Dragados
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