LESS THAN
20%
RESIDUAL MOISTURE IN THE DEWATERED MATERIAL
A new link in the form of a road tunnel is being built between the A44 and A4 freeways in Leiden, Netherlands. The two parallel tunnel tubes, each 2.25 km long, were excavated by a Herrenknecht Mixshield tunnel boring machine with a diameter of nearly 11 m. The muck was processed by a separation plant from Herrenknecht Separations. With a circuit of up to a maximum of 2,800 m³ per hour and a capacity of up to 1,000 t per hour, more than 100 mm of advance per minute was possible despite unforeseen difficulties - a Dutch record!