Types of Drawbridges

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat. In some forms of English, including American English, the word drawbridge commonly refers to all types of movable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the narrower, more historical definition of the term.

A bascule bridge (sometimes referred to as a drawbridge) is a moveable bridge with a counterweight that continuously balances a span, or "leaf", throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed.

A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats or barges. In American English, moveable bridge and drawbridge are synonymous, and the latter is the common term, but drawbridge can be limited to the narrower, historical definition used in some other forms of English, in which drawbridge refers only to a specific type of moveable bridge.

A box girder bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete.

A bridge–tunnel is a persistent, unbroken road or rail connection across water that uses a combination of bridges and tunnels, and sometimes causeways, and does not involve intermittent connections such as drawbridges or ferries. Bridge–tunnels are a common form of fixed link or fixed crossing which replaces ferry service.

The Burr Arch Truss—or, simply, Burr Truss or Burr Arch—is a combination of an arch and a multiple kingpost truss design. It was invented in 1804 by Theodore Burr, patented on April 3, 1817, and used in bridges, usually covered bridges.

The cable-stayed bridge is optimal for spans longer than cantilever bridges and shorter than suspension bridges. This is the range where cantilever bridges would rapidly grow heavier if the span were lengthened, while suspension bridge cabling would not be more economical if the span were shortened.

A cantilever bridge is a bridge built using cantilevers, structures that project horizontally into space, supported on only one end. For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete.

A cantilever spar cable-stayed bridge is a modern variation of the cable-stayed bridge. This design has been pioneered by the structural engineer Santiago Calatrava in 1992 with the Puente del Alamillo in Seville, Spain.

This list of bridges in the United States is organized by state and includes notable bridges in the United States of America. There are more than 600,000 bridges in the USA. This transport-related list is incomplete; you can help by expanding it.

An extradosed bridge employs a structure which combines the main elements of both a prestressed box girder bridge and a cable-stayed bridge.

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat. In some forms of English, including American English, the word drawbridge commonly refers to all types of movable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the narrower, more historical definition of the term.

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat. In some forms of English, including American English, the word drawbridge commonly refers to all types of movable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the narrower, more historical definition of the term.

In American English, moveable bridge and drawbridge are synonymous, and the latter is the common term, but drawbridge can be limited to the narrower, historical definition used in some other forms of English, in which drawbridge refers only to a specific type of moveable bridge.

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat.

A pontoon bridge (or ponton bridge), also known as a floating bridge, uses floats or shallow-draft boats to support a continuous deck for pedestrian and vehicle travel. The buoyancy of the supports limits the maximum load they can carry.

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat. In some forms of English, including American English, the word drawbridge commonly refers to all types of movable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the narrower, more historical definition of the term.

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat.

A tilt bridge is a type of moveable bridge which rotates about fixed endpoints rather than lifting or bending, as with a drawbridge.

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat. In some forms of English, including American English, the word drawbridge commonly refers to all types of movable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the narrower, more historical definition of the term.

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat. In some forms of English, including American English, the word drawbridge commonly refers to all types of movable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the narrower, more historical definition of the term.

Truss is a formation produced by triangular components, in accordance with the truss bridge drawings, and coupled at joints known as nodes. The truss bridge construction is initiated with a detailed soil analysis to determine the suitability of soil for the bridge and traffic loads.

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat.

A drawbridge or draw-bridge is a type of movable bridge typically associated with the entrance of a castle and a number of towers, surrounded by a moat. In some forms of English, including American English, the word drawbridge commonly refers to all types of movable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the narrower, more historical definition of the term.