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A timber bridge or wooden bridge is a bridge that uses timber or wood as its principal structural material. One of the first forms of bridge, those of timber have been used since ancient times. Wooden bridges could be a deck-only structure or a deck with a roof. Wooden bridges were often a single span, but could be of multiple spans.
In a simple suspension bridge the deck lies on the main cables In a suspended deck bridge the deck is carried below the main cables by vertical "suspenders" Comparison of a catenary (black dotted curve) and a parabola (red solid curve) with the same span and sag. The catenary represents the profile of a simple suspension bridge, or the cable of ...
If deck space is available, homeowners may choose to include for the seating, outdoor couches and benches. Larger buildings may also have decks on the upper floors of the building which can be open to the public as observation decks or greeneries. A deck is also the surface used to construct a boardwalk over sand on barrier islands.
The wood is categorized as a board if its width is less than 2 + 1 ⁄ 2 in (64 mm), and its thickness is less than 1 + 1 ⁄ 2 in (38 mm). A plank used in a building as a horizontal supporting member that runs between foundations, walls, or beams to support a ceiling or floor is called a joist.
Shiplap is either rough-sawn 25 mm (1 in) or milled 19 mm (3 ⁄ 4 in) pine or similarly inexpensive wood between 76 and 254 mm (3 and 10 in) wide with a 9.5–12.7 mm (3 ⁄ 8 – 1 ⁄ 2 in) rabbet on opposite sides of each edge. [1] The rabbet allows the boards to overlap in this area.
A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1] A portcullis gate is constructed of a latticed grille , made of wood or metal or both, which slides down grooves inset within each jamb of the gateway.