Author: G. Kumar (TfL Engineering, ex-AECOM) and D.Sharples (AECOM)
2 July 2018
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G. Kumar (TfL Engineering, ex-AECOM) and D.Sharples (AECOM)
Farringdon Elizabeth line station comprises two platform tunnels, each 245m long, between new ticket halls over 300m apart. Each ticket hall has been designed to accommodate future oversite developments.
This paper discusses the structural engineering challenges encountered during design and construction of the two ticket halls on constrained sites surrounded by existing transport infrastructure, utilities and historic buildings.
There is something special about megaprojects that brings out the best in engineering design and construction. It could be that the longer-term durations for the planning, design and build phases allow more measured and thoughtful decision making; it could be that the weight of public exposure and expectation creates an added incentive to succeed; it could be that the prestige of being part of the programme attracts the best teams in the best organisations; it could be that the extended schedule nurtures a team spirit and a collaborative way of working that is difficult to achieve in a typical shorter-term project.
All the articles from the July 2018 issue - a special issue on 'Structural engineering for the Elizabeth line'.
This paper covers the engineering design of the platform edge screens for five Elizabeth line tunnel stations in central London. Full-height platform edge screens are a signature feature of the Elizabeth line’s station platforms, and their design presented many challenges. To gain maximum uniformity, the edge screens were developed as a common reference design, which was then issued to each of the station contractors. The paper describes the technical challenges from the point of view of a structural engineer, but in doing so, it draws in interfaces with disciplines as diverse as tunnel ventilation, electrical engineering, and rolling stock procurement. The reference design approach allowed unique features of the platform edge screens to be prototyped and tested before construction.