Temporary works for bridge installations involves Cass Hayward in a variety of different types of design. Almost routinely we are engaged in the preparation of schemes for erecting steel girder bridges but these can become quite a challenge when heavy lifts of multiple girders in complex skewed arrangements are required such as for Channelsea Curve. Increasingly we are studying erection using scissors lifts and other modern hydraulic equipment. Special slung pier-top support steelwork was required for our design of the Sheppey Crossing launch.
We have designed many temporary works schemes associated with strict control of demolition or part demolition of life expired elements of existing bridges and also of over-line masonry arches with inadequate qauge clearance which can be sensitive in multiple spans. At Erwood Bridge near Brecon reconstruction of damaged piers involved jacking to enable RC column bents to be rebuilt in-place. We were responsible for coordination and checking of the design of both the temporary works and permanent works during the operations.