Brick Jack Arch Flooring

Brick masonry arches have been used for hundreds of years.

Brick jack arch flooring.

Brick jack arch flooring. Used throughout the 19th century for its incombustibility and strength the jack arch was a widespread form of floor construction. 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. Brick jack arch flooring.

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. These floors are formed through constructing brick or concrete arches called jack arches on the lower flanges of mild steel joists. Only first class bricks should be used. The equilibrium polygon lies completely within the middle of the arch.

In this issue of technical notes an. A jack arch is a structural element in masonry construction that provides support at openings in the masonry. 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. 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.

Figure 1 illustrates jack and segmental arches. 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. Successive rings should be properly interlocked. Unlike regular arches jack arches are not semicircular in form.

Alternate names are flat arch and straight arch. The masonry arch is one of the oldest structural elements. 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. Many of the different types of brick masonry arches are discussed and a glossary of arch terms is provided.

Major arches are those with spans in excess of 6 ft or rise to span ratios greater than 0 15. This technical notes is an introduction to brick masonry arches. The victorian jack arch floors had larger brick arches around 1 5 m wide with a maximum rise of 20 cm. 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.