Bricks or concrete can be used to construct a jack arch floor. Arches are provided between the bottom flanges of rolled steel joists at intervals of not more than 1.5 m. The height of an arch is usually one-twelfth of the period. Mild steel ties are provided in the end spans to carry the tension caused by the arching action of the floor. The diameter of the tie rods is 18-25 mm and their spacing is 1.8-2.4 m. In addition, they are rigidly fixed to the walls, side filling is done with lime concrete and the required floor covering is provided. In this case plain roof is not obtained and it can be considered as lacking such construction.
Leave a Reply