Pipe Arch Construction Snow Hill Station

Client: Network Rail / Bam Nuttall
Project Value: £775,000
Scope:

As part of the major works to improve the pedestrian access to the central Snow Hill station platforms from the city, Delta were employed on two early phases of this complex project:

Ph1: To sink a hand excavated, 2.7m dia precast concrete shaft, sunk as a caisson from the platform above, together with a steel framed heading to the existing arch, which allowed the removal of the arisings whilst excavating the cofferdam from the platform down, which also included the removal of the newly installed caisson shaft.

Ph2: Construction of a ‘Structural Steel Pipe Arch’ to support the existing infrastructure, allowing the excavation of the new passenger access route through the end wall of the existing brick arch to the central escalator and lift access to platform level. Delta deployed for phase 2, a specially designed and modified PB85AGuided Boring machine to carry out the work. The machine acted as a horizontal piling rig, mounted on an elevated working platform with variable heights and positioning, and was able to install the pipe arch assembly, which measured 4.9m high and 3.8m wide and consisted of 28Nr 406mm OD steel casings varying in length from 4.5m to 5.5m. 

Pipe Arch Construction Snow Hill Station

Pipe Arch Construction Snow Hill Station

Pipe Arch Construction Snow Hill Station

Pipe Arch Construction Snow Hill Station

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