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We are looking at a number of station platform extensions/new platforms for Network Rail. As I'm sure you know, one of their standard platform designs use blockwork crosswalls with hollowcore planks spanning longitudinally. At some sites it is necessary for the platform to be tapered and obviously this presents a problem with this type of construction. Can you please advise whether there is any practical way of incorporating a longitudinal taper into a hollowcore floor, either during manufacture on site? If so, are there are any preferred details and/or limitations on the geometry and what are the manufacturing cost implications?

hollow core units can be manufactured with a tapersd side. the minimum angle from one side of the unit to the splay is 10 degrees.the unit must be 1200mm wide for a minimum of 1.0m before the side splay starts. the above is all subject to design and plans forwarded to bison for confirmation.