Title:
Concrete Ring Beam Used in Excavation
Author(s):
Chandru G. Hira
Publication:
Concrete International
Volume:
21
Issue:
4
Appears on pages(s):
62-63
Keywords:
caisson walls; curved beams; excavation; piles; shoring
DOI:
Date:
4/1/1999
Abstract:
Circular brace beams are normally designed as steel beams. However, in this project — the Carruthers Creek Pumping Station in the town of Ajax, Ontario — circular concrete brace beams were used. The circular shaft was approximately 21 m (69 ft) in outer diameter and 18 m (59 ft) deep. The system of using a concrete ring beam had the following advantages: minor misalignments in the construction of the caisson wall could easily be handled; major welding of steel sections was eliminated; no cranes were required to lift and hold the steel beams in position; and removal of the ring braces was not necessary during the permanent construction, thus saving both time and costs.