The works consist of the construction of 25 km of the tunnel with an excavation diameter of approximately 7 metres and 10 access shafts with depths varying between 40 and 80 metres.
The project, which is particularly complex from a technical and organisational point of view, involves the simultaneous use of five TBMs (Tunnel Boring Machines) at earth pressure, capable of excavating and at the same time coating the tunnel with prefabricated concrete.
It is the first time that this sophisticated, mechanised excavation technology has been used in Abu Dhabi.
Both the hydraulic tunnel and the access shafts will be covered with a special membrane which will guarantee the concrete structures total protection from the aggressive ambient and will last at least one hundred years.
|MAIN TECHNICAL DATA:|
|Underground excavations||535,000 m3||356,000 m3|
|Concrete||185,000 m3||125,000 m3|
|Steel reinforcement||3,700 tons||2,465 tons|
|Metal fibres||3,150 tons||2,100 tons|
|Prefabricated blocks||11,071 n°||7,381 n°|
|HDPE membrane||248,000 m2||163,350 m2
Deep Sewer Tunnel