Search results
Results from the WOW.Com Content Network
Cut-and-cover construction of the Paris Métro in France. Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over with an overhead support system strong enough to carry the load of what is to be built above the tunnel. Two basic forms of cut-and-cover tunnelling are available:
Cut-and-cover construction at Saint-Michel on Paris Métro Line 4 (c. 1910) Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over with an overhead support system strong enough to carry the load of what is to be built above the tunnel. [29] There are two basic forms of cut-and-cover ...
A slurry wall is a civil engineering technique used to build reinforced concrete walls in areas of soft earth close to open water, or with a high groundwater table. [1] This technique is typically used to build diaphragm (water-blocking) walls surrounding tunnels and open cuts, and to lay foundations.
Tunnel exit on the Sagrera side, where the Barcelona-Sagrera station, currently under construction, is located. The Sants-Sagrera high-speed tunnel runs from Barcelona-Sants station to the future Barcelona-Sagrera station along Provença Street, Avinguda Diagonal, and Mallorca Street, [47] covering a length of 5.78 km.
Deep level underground is construction that is 20 m (66 ft) or more below ground and not using the cut-and-cover method, especially train stations, air raid shelters and bunkers, and some tunnels and mines. Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over with an overhead support ...
A 1974 state plan again proposed an extension to Park Street, while the 1978 and 1983 Program for Mass Transportation updates called for an extension to Charles/MGH instead. [15] A 1986 MBTA feasibility study for an extension to Charles/MGH evaluated a cut-and-cover tunnel beginning west of Bowdoin Street with no changes to Bowdoin station.
The new Austrian tunneling method (NATM), also known as the sequential excavation method (SEM) or sprayed concrete lining method [1] (SCL), is a method of modern tunnel design and construction employing sophisticated monitoring to optimize various wall reinforcement techniques based on the type of rock encountered as tunneling progresses.
A sub-surface Metropolitan line A Stock train (left) passes a deep-tube Piccadilly line 1973 Stock train (right) in the siding at Rayners Lane.. The Circle, District, Hammersmith & City, and Metropolitan lines are services that run on the sub-surface network, that has railway tunnels just below the surface and was built mostly using the cut-and-cover method.