Service Performed Detailed design including tender documentation
Technical data
City sewage system: NATM tunnel under compressed air, construction of new scheme located 1 m below operating old brick lined sewage pipe.
Geology description
Tertiary clay, gravel and mud, (ground water table above tunnel roof).
Description
City sewage system: NATM tunnel under compressed air (0.25 bar), construction of new scheme located 1m below operating old brick lined sewage pipe. Steel plate lining is closed to the face (2 m behind) to reduce air pressure losses.
