Abstract: A furnace grate structure for a furnace or incinerator on which solid fuel advances in an advancing direction has at least two parallel grate beams extending substantially transversely to the advancing direction, the beams being mounted on a substructure and forming upwardly facing support structures. The grate beams form grate beam sections with gaps formed between the end surfaces of adjacent grate beam sections. The gaps are covered by a covering device and a recess is provided in the end surfaces of the grate beam sections to receive the covering device.