Tunnel Design & Specialities

Feasibility study for joint Light Rail / Motorway tunnel.

Limited surface access and highly congested underground space with old cast iron tunnels platform tunnel very close together with passenger access and exit at the western end only. The feasibility design looked at options to improve the passenger space at the existing access and exit point, provide a second means of escape, MIP lift access to the surface and smoke extraction.

Conceptual and preliminary engineering services for the Chinatown Station of the MUNI Light Rail System in San Francisco. The responsibilities include constructability evaluations, alignment and construction alternatives studies and preparation of preliminary design documents. Alternatives, including deep bored tunnel vs. shallow NATM tunneling will be evaluated.

City sewage system: NATM tunnel under compressed air, construction of new scheme located 1 m below operating old brick lined sewage pipe.

Pressure tunnel with a lenght of 7 km (4.3 mi) and a diameter of 10 m (32.8 ft). Excavation in full face, top heading and invert according to encountered rock conditions. Initial support with lattice girders, steel fiber reinforced shotcrete and rock bolts. Grouting pipe spiling as pre-support for areas with deteriorated rock.

11.6 m diameter shaft, approx. 45 m deep. Concrete segmental construction to 24.95 m OD. NATM construction to the base at -43.25 m OD with a 7.5 m span TBM launch chamber and mucking bunker, 40 m long, and 4.0 m diameter backshunt adit, 13.5 m long.

Hydro Electric Power Scheme. Diversion Works: 2 tunnels (1 km each). Outlet and Intake open cut slopes and bottom outlet shaft.

24.4 km long transfer tunnel, 4.2 m diameter.

Power generation complex including power house cavern, shaft, tunnels and galleries etc.

Earth dam, two inclined spillway shafts and tunnels (12 m ID, inclined length 140 m, horizontal length 550 m), diversion tunnel (500 m long), power tunnel (8,5 m ID, 480 m long), surface power house and 3 km long grouting tunnel.