Jack Arch Roof Section

A jack arch is a structural element in masonry construction that provides support at openings in the masonry.

Jack arch roof section.

Instead they are flat in profile and are used under the same circumstances as lintels unlike lintels which are subject to bending stress jack arches are composed of. Jack arch roof is composed of arches of either brick or lime concrete supported on lower flange of r s j s. Is 2118 title of legally binding document. The rise of the arch is kept 1 12th of the span.

The minimum depth at the crown is kept at 150 mm. The joists are spaced 1 0 to 1 5 m centre to centre and are supported at their ends either on walls or on longitudinal girders. The concrete layer thickness over the crown of the arch is not less than 15cm. The rise of the arch is kept equal to 1 12th of the span.

Code of practice for construction of jack arch type of bult up floor or roof. Jack arch roof detailed section. 2 4 jack arch floor or roof a type of built up floor or roof supported by iack arches having a levelling course of lime broken brick aggregate concrete laid over them and finiihed. 2 3 hand beater a wooden piece of triangular cross section used manually for beating and compacting lime concrete.

Layer of concrete is then poured over the roof to straighten the roof. Alternate names are flat arch and straight arch.