Moveable bridge
Information about Moveable bridge
A movable bridge is a bridge that moves to allow passage for (usually) boats or barges. By making the bridge movable it may be made low, which avoids the expense of high piers and long approaches, greatly reducing the cost of the bridge. The principal disadvantage is that the traffic on the bridge must be halted when it is opened for passages. For seldom used railroad bridges over busy channels the bridge may be left open and then closed for train passages. For small bridges bridge movement may be enabled without the need for an engine. Some bridges are operated by the users, especially those with a boat, others by a bridgeman, sometimes remotely using video-cameras and loudspeakers. Generally the bridges are powered by electric motors, whether operating winches, gearing, or hydraulic pistons.
The movable bridge is able to span up to about 4,000 feet and is made out of steel, concrete, or primarily any other material. The George P. Coleman bridge, with a span of 3,750 feet is the longest moveable bridge in the U.S and the second longest in the world.
There are often traffic lights for the road and water traffic, and moving barriers for the road traffic.
In the United States, regulations governing the operation of movable bridges, for example, hours of operation and how much advance notice must be given by water traffic, are listed in title 33 of the Code of Federal Regulations[1]; temporary deviations are published in the Coast Guard's Local Notice to Mariners[2].
|240px|Beam Bridge (
..... Click the link for more information.
A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end.
..... Click the link for more information.
A suspension bridge
..... Click the link for more information.
The movable bridge is able to span up to about 4,000 feet and is made out of steel, concrete, or primarily any other material. The George P. Coleman bridge, with a span of 3,750 feet is the longest moveable bridge in the U.S and the second longest in the world.
There are often traffic lights for the road and water traffic, and moving barriers for the road traffic.
In the United States, regulations governing the operation of movable bridges, for example, hours of operation and how much advance notice must be given by water traffic, are listed in title 33 of the Code of Federal Regulations[1]; temporary deviations are published in the Coast Guard's Local Notice to Mariners[2].
Types of moving bridges
- Drawbridge - the bridge deck is hinged on one end
- Bascule bridge - a drawbridge hinged on pins with a counterweight to facilitate raising
- Folding bridge - a drawbridge with multiple sections that collapse together horizontally
- Curling bridge - a drawbridge with multiple sections that curl vertically
- Lift bridge - the bridge deck is lifted up by counterweighted cables mounted on towers
- Table bridge - a lift bridge with the lifting mechanism mounted underneath it
- Retractable bridge (Thrust bridge) - the bridge deck is retracted to one side
- Rolling bascule bridge - an unhinged drawbridge which is lifted by the rolling of a large gear segment along a horizontal rack
- Submersible bridge - the bridge deck is lowered down into the water
- Tilt bridge - the bridge deck, which is curved, is lifted up at an angle
- Swing bridge - the bridge deck rotates around a fixed point, usually at the center, but may resemble a gate in its operation
- Transporter bridge - a structure high above carries a suspended, ferry-like structure
- Jetway - a passenger bridge to an airplane
See also
- Bailey bridge, Medium Girder Bridge, and Armoured vehicle-launched bridge - transportable or relocatable bridges.
- Pontoon bridge - may be built with a barge or boat-like section that may be moved for passage.
Bridge-related articles | ||
|---|---|---|
| Types of bridges | Moveable bridge Beam bridge Cantilever bridge Arch bridge Suspension bridge Cable-stayed bridge Truss bridge Visual index to various types | ) |
| Lists of Bridges | Notable bridges By length Longest suspension bridge spans Largest cable-stayed bridges Largest cantilever bridges Arch bridges Bridge disasters | |
bridge is a structure built to span a gorge, valley, road, railroad track, river, body of water, or any other physical obstacle. Designs of bridges will vary depending on the function of the bridge and the nature of the terrain where the bridge is to be constructed.
..... Click the link for more information.
..... Click the link for more information.
George P. Coleman Memorial Bridge (known locally as simply the Coleman Bridge) is a swing bridge that spans the York River between Gloucester County and York County at Yorktown, Virginia. It connects the Peninsula and Middle Peninsula regions of Tidewater Virginia.
..... Click the link for more information.
..... Click the link for more information.
traffic light, also known as a traffic signal, stop light, traffic lamp, stop-and-go lights, robot or semaphore, is a signaling device positioned at a road intersection, pedestrian crossing, or other location in order to indicate which
..... Click the link for more information.
..... Click the link for more information.
CFR can refer to:
..... Click the link for more information.
- Code of Federal Regulations of the United States.
- Council on Foreign Relations, U.S. foreign policy think tank
- Campaign finance reform
- Cost and Freight, word used in international commerce
- CFR Cluj, Romanian football club.
..... Click the link for more information.
drawbridge is a type of movable bridge typically associated with the entrance of a butt the term is often used to describe all different types of movable bridges, like bascule bridges and lift bridges.
..... Click the link for more information.
..... Click the link for more information.
Bascule Bridge is a paved one-lane highway bridge in Westport, Massachusetts, USA. Route 88 passes over the bridge from Westport Point and Wood Point in southern Westport to the Horseneck Beach State Reservation, connecting with John Reed Road.
..... Click the link for more information.
..... Click the link for more information.
A Folding bridge is a type of movable bridge.
An example of a folding bridge is the Hörnbrücke (Hoernbridge) in the city of Kiel in the German state of Schleswig-Holstein.
..... Click the link for more information.
An example of a folding bridge is the Hörnbrücke (Hoernbridge) in the city of Kiel in the German state of Schleswig-Holstein.
..... Click the link for more information.
curling bridge is a type of movable bridge, of which the sole example shown here is The Rolling Bridge, built in 2004 as part of the Grand Union Canal office & retail development project at Paddington Basin, London.
..... Click the link for more information.
..... Click the link for more information.
A vertical lift bridge or lift bridge is a type of movable bridge in which a span rises vertically while remaining parallel with the deck.
The vertical lift offers several benefits over other movable bridges such as the bascule and swing span bridge.
..... Click the link for more information.
The vertical lift offers several benefits over other movable bridges such as the bascule and swing span bridge.
..... Click the link for more information.
A table bridge is a moveable bridge in which the deck moves along the vertical axis. Hydraulic pillars under the bridge raise the bridge deck to allow barge traffic to pass beneath it.
..... Click the link for more information.
..... Click the link for more information.
The bridge deck of a retractable bridge can be rolled or slid backwards to open a gap for crossing traffic, usually a ship on a waterway. This type is sometimes referred to as a thrust bridge.
..... Click the link for more information.
..... Click the link for more information.
Pegasus Bridge is a bascule bridge over the Caen Canal, near Ouistreham, France. The bridge, also known as the Bénouville Bridge after the neighbouring village, was a major objective of Operation Tonga.
..... Click the link for more information.
..... Click the link for more information.
A Rack and Pinion is a pair of gears which convert rotational motion into linear motion. The circular pinion engages teeth on a flat bar - the rack.
..... Click the link for more information.
..... Click the link for more information.
A moveable submersible bridge lowers the bridge deck below the water level to permit waterborne traffic to use the waterway. This differs from a lift bridge or table bridge, which operate by raising the roadway.
..... Click the link for more information.
..... Click the link for more information.
tilt bridge is a type of moveable bridge which rotates about fixed endpoints rather than lifting or bending, as with a drawbridge. For this rotation to serve a useful purpose, namely facilitating boat traffic underneath, its deck must follow a curved shape.
..... Click the link for more information.
..... Click the link for more information.
A swing bridge is a bridge that has as its primary structural support a vertical locating pin and support ring at or near to its center, about which it can then pivot horizontally as shown in the animated illustration below.
..... Click the link for more information.
..... Click the link for more information.
transporter bridge (also ferry bridge or aerial transfer bridge) is a type of movable bridge that carries a segment of roadway across a river. The gondola is slung from a tall span by wires or a metal frame.
..... Click the link for more information.
..... Click the link for more information.
ferry is a form of transport, usually a boat or ship, but also other forms, carrying (or ferrying) passengers and sometimes their vehicles. Ferries are also used to transport freight (in lorries and sometimes unpowered freight containers) and even railroad cars.
..... Click the link for more information.
..... Click the link for more information.
Jetway is the registered trademark of FMC Technologies, Inc. for their line of enclosed, moveable jet bridge connectors (also termed loading bridges, aerobridges/airbridges, or passenger boarding bridges
..... Click the link for more information.
..... Click the link for more information.
Bailey bridge is a portable pre-fabricated truss bridge, designed for use by military engineering units to bridge up to 60 m (200 foot) gaps. It requires no special tools or heavy equipment for construction, the bridge elements are small enough to be carried in trucks, and the
..... Click the link for more information.
..... Click the link for more information.
Medium Girder Bridge (MGB) is a lightweight, man portable bridge and can be assembled without help from heavy equipment. In addition, it is also a deck type, two-girder bridging system capable of carrying loads up to and including main battle tanks
..... Click the link for more information.
..... Click the link for more information.
An armoured vehicle-launched bridge (or AVLB) is a combat support vehicle, sometimes regarded as a subtype of combat engineering vehicle, designed to assist militaries in rapidly deploying tanks and other armoured fighting vehicles across rivers.
..... Click the link for more information.
..... Click the link for more information.
pontoon bridge or floating bridge is a bridge that floats on water, supported by barge-or-boat-like pontoons to support the bridge deck and its dynamic loads. While pontoon bridges are usually temporary structures, some are used for long periods of time.
..... Click the link for more information.
..... Click the link for more information.
bridge is a structure built to span a gorge, valley, road, railroad track, river, body of water, or any other physical obstacle. Designs of bridges will vary depending on the function of the bridge and the nature of the terrain where the bridge is to be constructed.
..... Click the link for more information.
..... Click the link for more information.
Beam Bridge
Beam Bridge ()
..... Click the link for more information.
For the dentistry term, see .
A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end.
..... Click the link for more information.
An arch bridge is a bridge with abutments at each end shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side.
..... Click the link for more information.
..... Click the link for more information.
- This article is concerned with a particular type of suspension bridge, the suspended-deck type. For an index to the several types see suspension bridge types.
A suspension bridge
..... Click the link for more information.
A cable-stayed bridge is a bridge that consists of one or more columns (normally referred to as towers or pylons), with cables supporting the bridge deck. There are two major classes of cable-stayed bridges, differentiated by how the cables are connected to the
..... Click the link for more information.
..... Click the link for more information.
A truss bridge is a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to dynamic loads. Truss bridges are one of the oldest types of modern bridges.
..... Click the link for more information.
..... Click the link for more information.
This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.