Streatham Common Station Overbridge Reconstruction

Client

Volker Fitzpatrick for Network Rail

Project Description

The bridge carrying Greyhound Lane over the extention of the platforms at Streatham Common Station was reconstructed with an increased span to make room for platform extensions below. A new deck spanned between the existing pier on the island platform and a new contiguous piled abutment behind the extended ‘down’ platform on the east side. Lower headroom clearance over the platforms meant that the span could be haunched at its ends where it was made structurally continuous (integral) with the substructure. At the island platform the existing cellular pier which was reduced in width, was reused and infilled with lightweight concrete so that piling could be avoided. Works also included a contiguous pile retaining wall to the rear of the down platform.

Cass Hayward Role(s)

• Review of Form A design and value engineering study
• Detailed design for construction and independent checking of bridge and adjacent retaining wall
• Design and checking of temporary works
• Technical advice during construction & site attendance

Project Statistics

• Completed 2013
• New bridge skewed span 14.5m
• East side retaining wall adjacent to abutment 20m long 2.5m high.

Special Features

• Use of filler beam deck construction with full width soffit plates to avoid the need for formwork during deck casting over the tracks.
• Haunched filler beams with web profiled to follow highway alignment and allowing minimal construction depth so as to preserve headroom clearance over the tracks.
• Brick sandwich panel parapets with finish to match existing
• High Containment parapets anchored to insitu concrete part of the deck
• Weathering steel soffit and integral construction avoids the need for bearings and minimises future maintenance.