Design, Construction Supervision
Yews Lane Overbridge is a 3m wide single lane accommodation bridge which allows access across the railway to Hope Farm. The track was an unmade road and had no walkways on either side. The existing structure was three spans of approximately 10m formed from three asymmetric cast iron beams supporting masonry jack arches; cast iron parapets were provided to the deck. The bridge abutments and piers were constructed from limestone blockwork.
Crouch Waterfall provided structural design for a new structure to overcome the existing structure’s 6 tonne weight restriction with the new bridge proposed to allow passage of 40 tonne vehicles.
The new structure utilises the existing substructure with new cill units added to accept the new bridge deck. The new deck was a three span continuous steel structure (for additional robustness) constructed entirely from Rolled steel girders and a steel deck plate, with new steel N2 W1 parapets. Demolition of the existing superstructure and installation of the new cill beams and steel superstructure was completed within a 36 hour abnormal possession.
The materials used for the structure were, steel for the main deck, concrete for the run-on slabs and cill units and structural fill to reinstate the road embankments.