The spelling of the phrase "jack arch" is derived from the British English language. In IPA phonetic transcription, it is pronounced as /dʒæk ɑːtʃ/. The word "jack" refers to the support structure used in constructing the arch, which is commonly made of wooden planks. Meanwhile, the word "arch" indicates the architectural construction that is curved or rounded. The jack arch, therefore, is a type of arch bridge supported by a timber construction. Its spelling reflects the British English dialect commonly spoken in the United Kingdom.
A Jack arch is a type of construction technique used in architecture and engineering to create a structural support system. It is typically employed to strengthen horizontal openings, such as doorways, windows, or arches, in load-bearing walls.
The design of a Jack arch consists of a series of wedge-shaped bricks or tiles arranged in an architectural arch. These bricks are carefully positioned to exert a compressive force and distribute the load from above downwards, dispersing the weight across the supporting walls or piers on either side. The arch is typically found above the opening, creating a smooth and continuous surface.
The distinctive shape of a Jack arch allows it to eliminate the need for additional building materials such as steel beams or lintels, making it a cost-effective and structurally efficient solution. The arch itself provides crucial reinforcement to the wall, preventing it from sagging or collapsing due to the weight it bears.
The term "Jack arch" originates from the traditional method of construction, which involved a horizontal wooden scaffolding board, known as a "jack," that was used to temporarily support the bricks or tiles during construction.
With its functional and aesthetically pleasing design, a Jack arch offers strength, durability, and architectural beauty to various buildings, ranging from residential homes to large public structures.
The etymology of the word "jack arch" traces back to the 19th century.
The term "jack arch" is derived from the usage of the word "jack" to refer to a mechanical device or contrivance. In this case, "jack" is used to describe a type of support or filler used in construction. The arch part of the term refers to the architectural element itself, which is a structural feature in buildings that spans an open space.
The "jack arch" construction technique involves the use of wedge-shaped bricks or cast iron blocks, known as "jacks", to support the load above an opening such as a doorway or window. These jacks are placed with their tapered ends facing outwards and are arranged in an arch pattern. The jacks distribute the weight of the structure evenly, transferring it to the walls on either side of the opening.