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Precast, hollow core, concrete Trimmer Beams allow the inclusion of large floor voids, without the requirement to add additional columns. Trimmer beams can be seen as drawings below.
The adjacent planks on either side of the void are designed to carry the additional imposed load. The trimmer beam could be designed as a steel lintel or as an in-situ concrete beam being cast together with the topping screed.
Concrete, hollow core, Trimmer Beams are designed to support both the Hollow Core Slabs and the adjacent precast stair.