Prop loads in large braced excavations (PR77)

There is a minimum order of five copies for this title

Embedded walls retaining the sides of large excavations are often supported at some stage in the construction process by temporary props at one or more levels, in order to reduce wall and ground movements. The provision of temporary props, which typically consist of tubular steel sections1mormore in diameter, is costly in terms of money and time.

This guide investigates the apparent discrepancy between measured prop loads and those allowed for in design, by monitoring and analysis of the temporary prop loads developed during the construction of the Jubilee Line Extension stations at Canada Water and Canary Wharf. Prop temperatures were also measured to assess the influence of temperature changes on the prop loads.