A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.
Construction Methods. The 26-km Express Rail Link (XRL) runs from the Station in West Kowloon to Shenzhen. The Express Rail Link will operate in tunnels, which will be constructed by tunnel boring, or by drill and blast methods.
There are two main construction methods proposed for the City Rail Link: Cut and cover where the tunnels are dug from the surface . Tunnelling using a Tunnel Boring Machine (TBM), which travels at some depth below the ground and significantly reduces impact.
Crossrail is a 118-kilometre (73-mile) railway line under development in London and the home counties of Berkshire, Buckinghamshire and Essex, England.A large portion of the line, between Paddington in central London and Abbey Wood in the south-east, is due to open in autumn 2019.
GENERAL KNOWLEDGE ABOUT TBM TUNNELS . A typical rail tunnel section with its components . Schematic construction sequence for TBM . A shield machine at factory ready to transport out to the site
Definition and Construction • “A ‘Slurry Wall’ is a structural foundation element constructed below ground using a controlled slurry fluid,
Tunnelling Terms. Accelerator A substance added to concrete/shotcrete to accelerate setting. Adit A tunnel driven from ground surface to provide access to or drainage from underground workings; a length of tunnel driven for an exploration – exploration adit.
Tunnels and underground excavations, horizontal underground passageway produced by excavation or occasionally by nature’s action in dissolving a soluble rock, such as limestone.
Tunnels and underground excavations - Underground excavations and structures: While chambers in 1971 were being excavated in rock to fulfill a wide variety of functions, the main stimulus to their development had come from hydroelectric-power-plant requirements.
Meet our giant tunnelling machines. Digging the new tunnels was a 24-hour a day job, 7 days a week. Crossrail used eight tunnel boring machines (TBMs) to construct the new rail tunnels under London.
KAMY series of Roadheaders offers the best cutting performance in a wide range of rock formations. Equipped with geometrically optimized transverse or longitudinal cutter heads, these flexible machines can be used to excavate subway tunnels, road tunnels, railway tunnels and water tunnels without using explosives.