Brick Jack Arch Flooring

It was not a flat arch in the us sense of the term rather the jack arch consisted of shallow brick or concrete vaults spanning between iron or steel joists.

Brick jack arch flooring.

Before starting the work the rsj should be properly secured in position. Brick jack arch flooring. The floor slabs constructed using the steel i beam jack arch system are stable under normal static conditions as the brick arches transfer the gravity loads mainly in compression along the arch. Brick jack arch flooring.

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. Alternate names are flat arch and straight arch. In this issue of technical notes an. This technical notes is an introduction to brick masonry arches.

Major arches are those with spans in excess of 6 ft or rise to span ratios greater than 0 15. The later 20th century floors however were constructed using smaller brick arches 80 cm 1 0 m wide with an average rise of 5 cm so that a flat surface could also be created for the ceiling by direct plastering. The construction on jack needs centering of 30 to 40 mm thick segmental piece of timber along with chord length equivalent to the span of the arch and conforming to the soffit. Used throughout the 19th century for its incombustibility and strength the jack arch was a widespread form of floor construction.

Successive rings should be properly interlocked. The victorian jack arch floors had larger brick arches around 1 5 m wide with a maximum rise of 20 cm. Figure 1 illustrates jack and segmental arches. Brick masonry arches have been used for hundreds of years.

These floors are formed through constructing brick or concrete arches called jack arches on the lower flanges of mild steel joists. After that centering board is cut slightly at the ends and is made to rest on the lower flange of rsj along with the curved surface upwards. Unlike regular arches jack arches are not semicircular in form. A jack arch is a structural element in masonry construction that provides support at openings in the masonry.

Only first class bricks should be used. The equilibrium polygon lies completely within the middle of the arch. 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. Key brick should be properly and tightly secured in rich mortar.