The large city of Jeddah on the Red Sea in Saudi Arabia plans to extend its sewage system with the help of a comprehensive master plan. So far, only 20 percent of households are connected to the sanitary system - but this is due to change rapidly. Around 30 utility tunnelling machines by Herrenknecht (diameters 665mm - 4,200mm) are currently working on the sewage system and paving their way through cohesive to incohesive soils. The largest regional pipe jacking operation with a diameter of 4.20 meters and a length of around 13 kilometers was completed reliably.

Among other things, Herrenknecht also delivered and provided seven complete packages consisting of machine, control container, and all additional equipment. The innovative VSM technology by Herrenknecht for the safe sinking of shafts was successfully used in Jeddah. 16 shafts were sunk to route level using this technology.

A total of 140 kilometers of new sewage tunnels and shafts will be built to connect three sewage treatment plants to the wastewater network using Herrenknecht tunnelling technology.

The precise navigation of the AVN and AVND machines was accomplished with the help of a VSM navigation system. The local Herrenknecht branch provided promt supply with spare parts and fast service, ensuring rapid and cost-efficient tunnelling.