Skip to main content

REFINING CIRCULAR PROCESSES

Referenzen

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!

 

Scope of supply
  • Planning, design and support during setup, operational support of the plant and disassembly
  • HKS-CC 2800 separation plant, control room and laboratory
  • Bentonite mixing plant, tank system
  • Belt conveyor system including slewing disposal belt conveyor
  • Centrifuges for fine separation
  • Vinyl chloride gas detection and extraction system
  • - Noise and vibration canceling system (NVCS)

LESS THAN

20%

RESIDUAL MOISTURE IN THE DEWATERED MATERIAL

PROCESSING OF

450 tonnes

OF EXCAVATED MATERIAL PER ADVANCE

DUTCH RECORD

100 mm/min

 

Maximum separation capacity

To ensure uninterrupted excavation and that the separation of the bentonite slurry did not become the bottleneck of the tunnelling project, the plant for the Rijnlandroute project was designed for a capacity of 2,800 m³ per hour.

 

Despite this large volume, Herrenknecht Separations was able to ensure a residual moisture content of the excavated material of only 20% while keeping up with the high advance rate of the tunnel boring machine.