Engineers fixing a highway bridge in Germany used a mobile Puromat polyurethane unit from Krauss-Maffei Kunststofftechnik GmbH to produce bridge parts on-site.
Steel plates were permanently bonded together using a PU-elastomer core, made with the Puromat mixing and metering machine that was mounted on a special vehicle that rode on tracks, like a bulldozer.
Krauss-Maffei said the technique, called sandwich plate system, has been used in the ship-building industry, but this marked the first application on a highway. The bridge is on the A57 road between the German cities of Krefeld and Nijmwegen.
First, the worn road surface was removed. The deck was strengthened with a grid of steel strips. Steel plates were placed on top of the grid, creating cavities. The PU mix was pumped into the cavities and, when cured, created a strong bond with the existing bridge deck.
Krauss-Maffei, based in Munich, Germany, said Puromat fits into a standard shipping container so it can be sent anywhere in the world.
In the U.S., Krauss-Maffei's Reaction Process Machinery Division is based in Florence, Ky.
Tel. (859) 372-8549, fax (859) 283-0311, e-mail [email protected] uss-maffeicorp.com.