Precast Concrete for Underground Transport Systems


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Title: Precast Concrete for Underground Transport Systems

Author(s): E. C. Lim

Publication: Special Publication

Volume: 93


Appears on pages(s): 835-862

Keywords: concrete construction; grouting; precast concrete; subsurface structures; tunnel linings; tunnels; waterproofing

Date: 9/1/1986

With limited land space in urban areas, more and more s tructures are being built underground. The housing of under-ground transport facilities requires the construction of structures such as tunnels and shafts. The progress of such works has often been affected by poor soil conditions and the ingress of water. To overcome problems associataed with the use of poured-in-place concrete in such conditions, an increasing number of projects rely on the use of precast concrete. This paper discusses the role of precast concrete segments in the lining of bored tunnels, the use of prefabricated diaphragm walls for cut-and-cover tunnels and precast concrete elements for immersed tube tunnels. Constructional aspects of the London Underground Piccadilly Line Extension, Toronto Subway, Hong Kong Mass Transit Railway, Ahmed Hamdi Road Tunnel, Suez and the Lyon Metro are discussed. The topics elaborated include the manufacture of precast concrete elements, their delivery to site, erection procedures, grouting, waterproofing and protection of concrete against aggressive environment.