§ Construction of reinforced concrete shafts.
§ Sinking shafts as caissons under free and compressed air pressure.
§ Diversion of public utilities (Electricity, Gas, Water, Telephone, Sewage...).
§ Driving tunnel (2.87 m - 2.20 m I.D.) with Earth Balance Machines (Tunnel Boring Machines).
§ Erection of the primary tunnel lining (Reinforced concrete segments).
§ Erection of secondary lining using acid resistant blue bricks
§ Repairing leakage points at tunnel and shafts using special sealing materials
§ Application of chemical resistant epoxy mortar C.R.M. to the blue bricks' joints
§ Grouting mortar between primary lining and soil and also between primary and secondary linings
§ Connections between the existing sewage systems to the shafts using manholes, grit traps, culverts, pipe lines, etc...
Diversion of public utilities (Electricity, Gas, Water, Telephone, Sewage...)