Tunnels built in their own approaches

•Construction of precast immersed tunnel elements within alignment.•Alternative method of construction to traditional casting basin.•Integration of temporary and permanent works.•Design and construction of temporary works in weak Alluvium.•Measures to ensure watertight seal around tunnel structure....

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Bibliographic Details
Published inTunnelling and underground space technology Vol. 120; p. 104283
Main Author Shaw, Andrew
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.02.2022
Elsevier BV
Subjects
Casting basin alternative
Dry docks
Drydock in approaches
Immersed tunnel
Limerick tunnel
Temporary works
Tidal waterways
Tunnel construction
Tunnels
Underground construction
Water levels
Limerick tunnel
Drydock in approaches
Immersed tunnel
Casting basin alternative
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Summary:•Construction of precast immersed tunnel elements within alignment.•Alternative method of construction to traditional casting basin.•Integration of temporary and permanent works.•Design and construction of temporary works in weak Alluvium.•Measures to ensure watertight seal around tunnel structure. The Limerick Tunnel was constructed using the immersed tunnel technique in an ‘in-line’ casting basin or dry-dock within the footprint of the northern approach structures. The paper describes the benefits of this method of construction, the temporary works required to form the elements under challenging environmental conditions, namely poor ground conditions and a tidal river subject to large water level variation and strong currents.
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ISSN:0886-7798
1878-4364
DOI:10.1016/j.tust.2021.104283