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Plunge Columns (for top-down construction)
Construction Sequence
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Fields of application
Effective for top-down construction allowing for simultaneous deep basement excavation as well as superstructure erection, prior to the completion of basement excavation. Used in deep basement construction to form structural steel column projecting from the lower basement level foundations up to the approximate ground level.
Heavy and extensive strutting system minimized as the plunge columns may incorporate connection fixing points to allow the attachment of struts or beams. Plunge columns are also used to support the basement floor slabs which prop the excavation sides in the permanent condition. By propping the excavation with the permanent basement floor slabs in lieu of temporary props, an efficient design for the basement is created.
Environmental impact
Accelerated construction: creates significant saving of the overall construction time by realizing the superstructure at the same time as the basement excavation, thereby reducing disruption to the local area.
The top-down construction technique creates a more efficient permanent works design for the basement walls, saving significant quantities of steel and concrete.
No large working space required
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