Jack Arch Floor Construction

Jack arch construction sequence.

Jack arch floor construction.

1 2 this standard covers only the construction practices that are in general use in this country. Therefore the minimum jack arch depth of 8 inches would control for openings less than 4 feet in width. 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. It was largely superseded by the introduction of thinner and more fire resistant concrete encased steel and reinforced concrete floors later in the 20th century.

A jack arch is a structural element in masonry construction that provides support at openings in the masonry. 2 1 brick jack arch this is a low arch constructed with. 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.

Terminology 2 0 for the purpose of this standard the following definitions shall pply. This type of floor are widely used in modern construction world. For jack arches bia recommends the greater of 4 inches plus 1 inch per foot of span or 8 inches minimum. 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.

The opening will accommodate upos 0018 fire box door. Rcc floor can be cast in situ or precast. The minimum depth at the crown is kept at 150 mm. Rcc is the short form of reinforced cement concrete.

Jack arch roof is composed of arches of either brick or lime concrete supported on lower flange of r s j s. 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. The advantages of this type of floor. The arch detailed here spans a 410mm square fire box loading opening in the facade of a contraflow heater.

Alternate names are flat arch and straight arch. These floors are formed through constructing brick or concrete arches called jack arches on the lower flanges of mild steel joists. 1 1 this standard covers the design and construction of jack arch type of built up floor or roof. 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.

Unlike regular arches jack arches are not semicircular in form. The rise of the arch is kept 1 12th of the span. Jack arch roof construction where trapezoidal reinforced concrete beams are used at intervals between which hollow terra cotta blocks form small elongated multiple vaults.