Ash from the recycling process is stored on the premises of a steel recycling company. Recycled water is used to cool the ash. This drainage water must be sprayed in large quantities onto the hot ash via a sprinkler system. The sprinkler system itself operates at a system pressure of 3 to 4 bar.
Slurry walls are used in various construction and engineering applications where the creation of a deep, watertight, and structurally stable barrier is necessary, for example in tunnel construction to stabilize the surrounding soil and prevent water ingress during tunnel excavation.
Slurry walls are typically constructed by starting with a set of guide walls, typically 1 metre (3 ft 3 in) deep and 0.5 metres (1 ft 8 in) thick. The guide walls are constructed on the ground surface to outline the desired slurry trench and guide the excavation machinery. Excavation is done using a special clamshell-shaped digger or a hydromill trench cutter, suspended from a crane.
Once a particular length of trench is reached, a reinforcing cage is lowered into the slurry-filled pit and the pit is filled with concrete from the bottom up using tremie pipes. The heavier concrete displaces the bentonite slurry, which is pumped out, filtered, and stored in tanks for use in the next wall segment, or recycled.
Tsurumi was contacted by SUEZ company to support with the decontamination of the soils of the former FORD site in Bordeaax, where they manufactured gearboxes for trucks and cars. The grounds were heavily polluted with oil and hydrocarbons that mixed with water and sand. Furthermore, there were limitations to the piping available, hence pumps had to be selected carefully. However, the biggest challenge was that every cleaning cycle, once started, had to finish as a malfunction would cause additional work.
A hydroelectric power plant was built in Austria. In order to power the turbine a pressure flow tunnel had to be drilled with a diameter of 7,5 meters and total length approx. 20 km. For the tunnel construction a TBM (tunnel boring machine) was used and a lot of pumps were needed for the removal of the formation water which occured during the drilling.