Jack Arch Floor Construction

For jack arches bia recommends the greater of 4 inches plus 1 inch per foot of span or 8 inches minimum.

Jack arch floor construction.

Unlike regular arches jack arches are not semicircular in form. Therefore the minimum jack arch depth of 8 inches would control for openings less than 4 feet in width. Alternate names are flat arch and straight arch. Above them concrete fill is laid providing a level surface upon which the flooring finish can be if there is another level in the structure.

The masonry jack arch flooring was developed by early victorian architects in britain and used extensively to cover large floor areas at factories and other industrial buildings fine examples of this type of flooring can still be seen in the albert dock warehouses in liverpool designed by the early victorian architect jesse hartley and the late victorian kiln buildings and. Jack arch construction sequence. Jack arch roof is composed of arches of either brick or lime concrete supported on lower flange of r s j s. The arch detailed here spans a 410mm square fire box loading opening in the facade of a contraflow heater.

1 2 this standard covers only the construction practices that are in general use in this country. The advantages of this type of floor. Determining the point of intersection on the centre line is of the utmost importance to ensure the extrados is the right length to accommodate all 10 voussoir and the key. The minimum depth at the crown is kept at 150 mm.

It is easy to construct and. For example a 3 foot wide opening would require a jack arch depth of the greater of 4 plus 1 per foot 7 inches or 8 minimum. A jack arch is a structural element in masonry construction that provides support at openings in the masonry. 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.

It was largely superseded by the introduction of thinner and more fire resistant concrete encased steel and reinforced concrete floors later in the 20th century. Rcc floor can be cast in situ or precast. 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. Jack arch roof construction where trapezoidal reinforced concrete beams are used at intervals between which hollow terra cotta blocks form small elongated multiple vaults.

Terminology 2 0 for the purpose of this standard the following definitions shall pply. The joists are spaced 1 to 1 5 m centre to centre and are supported at their ends either on the walls or on longitudinal girders. Rcc is the short form of reinforced cement concrete. The rise of the arch is kept 1 12th of the span.

The opening will accommodate upos 0018 fire box door. The jack arch was an economical way of building a strong non combustible floor structure that could be left as a visible ceiling with a satisfying structural logic. 1 1 this standard covers the design and construction of jack arch type of built up floor or roof.