Trestle Support on:
[Wikipedia]
[Google]
[Amazon]
In
A trestle bridge is composed of a number of short spans supported by closely spaced trestle frames. Each supporting frame is a bent. A trestle differs from a
Railroad Construction
McGraw-Hill, New York, 1913; Section 96 – Wooden Trestles, pages 212–213.
structural engineering
Structural engineering is a sub-discipline of civil engineering in which structural engineers are trained to design the 'bones and joints' that create the form and shape of human-made Structure#Load-bearing, structures. Structural engineers also ...
, a trestle support (or simply trestle) is a structural element
In structural engineering, structural elements are used in structural analysis to split a complex structure into simple elements (each bearing a structural load). Within a structure, an element cannot be broken down (decomposed) into parts of dif ...
with rigid beams forming the equal sides of two parallel isosceles triangle
In geometry, an isosceles triangle () is a triangle that has two Edge (geometry), sides of equal length and two angles of equal measure. Sometimes it is specified as having ''exactly'' two sides of equal length, and sometimes as having ''at le ...
s, joined at their apices by a plank or beam. Sometimes additional rungs are stretched between the two beams. A pair of trestle legs can support one or several boards or planks, forming a trestle table
In woodworking, a trestle table is a table consisting of two or three trestle supports, often linked by a stretcher (longitudinal cross-member), over which a board or tabletop is placed. In the Middle Ages, the trestle table was often lit ...
or trestle desk. A network of trestle supports can serve as the framework for a trestle bridge
A trestle bridge is a bridge composed of a number of short spans supported by closely spaced frames usually carrying a railroad line. A trestle (sometimes tressel) is a rigid frame used as a support, historically a tripod used to support a st ...
, and a trestle of appropriate size to hold wood for sawing is known as a sawhorse
In woodworking, a saw-horse or sawhorse (saw-buck, trestle, buck) is a Trestle support, trestle structure used to support a lumber, board or plank (wood), plank for sawing. A pair of sawhorses can support a plank, forming a scaffold. In certa ...
.
Trestle table
Atrestle table
In woodworking, a trestle table is a table consisting of two or three trestle supports, often linked by a stretcher (longitudinal cross-member), over which a board or tabletop is placed. In the Middle Ages, the trestle table was often lit ...
is a table with trestle legs. In shape and manufacture, it sometimes resembles variations of the antique field desk, which were used by officers close to the battlefield.
Trestle legs come in two kinds:
*Fixed trestle legs, where the angle between the legs is a fixed joint.
*Folding trestle legs, where the angle is hinged, to make them more compact and portable.
In the United States, a table or desk supported by X-shaped trestles is usually called a sawbuck table.
Trestle bridge
A trestle bridge is composed of a number of short spans supported by closely spaced trestle frames. Each supporting frame is a bent. A trestle differs from a viaduct
A viaduct is a specific type of bridge that consists of a series of arches, piers or columns supporting a long elevated railway or road. Typically a viaduct connects two points of roughly equal elevation, allowing direct overpass across a wide ...
in that viaducts have towers that support much longer spans and typically have a higher elevation.
Timber and iron trestles (i.e. bridges) were extensively used in the 19th century, particularly for railroads. In the 21st century, steel and sometimes concrete trestles are occasionally used to bridge particularly deep valleys, while timber trestles remain common in certain areas. Timber trestles remain common in some applications, most notably for bridge approaches crossing floodways, where earth fill would dangerously obstruct floodwater.
Many timber trestles were built in the 19th and early 20th centuries with the expectation that they would be temporary. Timber trestles were used to get the railroad to its destination. Once the railroad was running, it was used to transport the material to replace trestles with more permanent works, transporting and dumping fill around some trestles and transporting stone or steel to replace others with more permanent bridges.Charles Lee Crandall and Fred Asa BarnesRailroad Construction
McGraw-Hill, New York, 1913; Section 96 – Wooden Trestles, pages 212–213.
See also
*Bent (structural)
A bent in American English is a transverse rigid frame (or similar structures such as three-hinged arches). Historically, bents were a common way of making a timber frame; they are still often used for such, and are also seen in small steel-fram ...
*Truss
A truss is an assembly of ''members'' such as Beam (structure), beams, connected by ''nodes'', that creates a rigid structure.
In engineering, a truss is a structure that "consists of two-force members only, where the members are organized so ...
* Trestle desk
*List of desk forms and types
This is a list of different types and forms of desks.
Desk forms and types
* Armoire desk
* Bargueño desk
* Bench desk
* Bible box
* Bonheur du jour
* Bureau à gradin
* Bureau brisé
* Bureau capucin
* Bureau Mazarin
*''Bureau plat'', see W ...
* Stretcher (furniture)
*Sawhorse
In woodworking, a saw-horse or sawhorse (saw-buck, trestle, buck) is a Trestle support, trestle structure used to support a lumber, board or plank (wood), plank for sawing. A pair of sawhorses can support a plank, forming a scaffold. In certa ...
References
{{Reflist *Gloag, John. A Complete Dictionary of Furniture. Woodstock, N.Y. : Overlook Press, 1991. *Moser,Thomas. Measured Shop Drawings for American Furniture. New York: Sterling Publishing Inc., 1985. Tables (furniture) Portable furniture