|The soffit of a segmental arch describes an arc being less than
a semi-circle and makes an angle with the face of the abutments. It has the
advantages of an elliptical arch, but is easier to construct. The rise between
the springing point and the crown of the arch need not be very great, so there
is good clearance over the full width of the span.
This skewed, segmental arch at Bermondsey Street supports London Bridge signalbox
Most segmental arches spring from vertical abutments. However, the East Kent Railway constructed quite a few where the arch is built directly out of the cutting side. These are found particularly between Swanley and Sole Street and Faversham and Dover, where the railway runs through chalk cuttings.
Manor Road bridge spans the cutting at Longfield Hill, between Longfield and Meopham.
The advantage of segmental arches in saving material resulted in them being constructed where headroom would have allowed round-headed arches.
Church Lane bridge, which spans the former Uckfield line at Lewes, has similar architectural features to bridge 1289.
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This page was last updated 18 April 2011