Misplaced Pages

#230769

12-481: The current bridge was inaugurated in 1938 and replaced an earlier bridge from 1879. It has a length of 403 metres (1,322 ft) and is a bascule bridge of steel truss design with nine spans. The bridge carries a single railway track which has a maximum authorized speed of 60 kilometres per hour (37 mph). Since 2003, Jernbanebroen over Limfjorden (English: the Limfjord Railway Bridge ) has been

24-522: A drawbridge or a lifting bridge ) 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. The name comes from the French term for balance scale , which employs the same principle. Bascule bridges are the most common type of movable span because they open quickly and require relatively little energy to operate, while providing

36-667: A single standard gauge track with a maximum authorized speed of 60 kilometres per hour (37 mph). The bridge connects the Aalborg–Frederikshavn railway line with the Randers–Aalborg railway line as well as the rest of the Danish railway network . The bridge opens 4,000 times a year, and there are 10,000 annual sailings under it. [REDACTED] Media related to Limfjord Railway Bridge at Wikimedia Commons Bascule bridge A bascule bridge (also referred to as

48-571: A "Chicago" bascule) rotates around a large axle that raises the span(s). The Chicago bascule name derives from the location where it is widely used, and is a refinement by Joseph Strauss of the fixed-trunnion. The rolling lift trunnion (sometimes a "Scherzer" rolling lift), raises the span by rolling on a track resembling a rocking-chair base. The "Scherzer" rolling lift is a refinement patented in 1893 by American engineer William Donald Scherzer . The rarer Rall type combines rolling lift with longitudinal motion on trunnions when opening. It

60-413: Is called the load moment . By extension, a counterbalance force balances or offsets another force, as when two objects of equal weight, power, or influence are acting in opposition to each other. Metronome : A wind-up mechanical metronome has an adjustable weight and spring mechanism that allows the speed to be adjusted by placement of the weight on the spindle. The tempo speed is decreased by moving

72-422: The lifting machine. Counterweights are often used in traction lifts (elevators), cranes and funfair rides. In these applications, the expected load multiplied by the distance that load will be spaced from the central support (called the "tipping point") must be equal to the counterweight's mass times its distance from the tipping point in order to prevent over-balancing either side. This distance times mass

84-561: The official name for the railway bridge between Aalborg and Nørresundby, though colloquially it is simply called Jernbanebroen (English: the Railway Bridge ). Formerly known as Limfjordsbroen (English: the Limfjord Bridge ), there is a road bridge to the east of the railway bridge, Limfjordsbroen , of the same name. The Vendsyssel railway line through the historical region of Vendsyssel from Frederikshavn to Nørresundby

96-425: The possibility for unlimited vertical clearance for marine traffic. Bascule bridges have been in use since ancient times, but until the adoption of steam power in the 1850s, very long, heavy spans could not be moved quickly enough for practical application. There are three types of bascule bridge and the counterweights to the span may be located above or below the bridge deck. The fixed- trunnion (sometimes

108-456: The rest of the Danish railway network. The original railway bridge was replaced by the current Limfjord Railway Bridge which was inaugurated on 23 April 1938. Until 1 January 1997, it belonged to the railway company DSB when DSB was split into DSB and Banedanmark . On 28 March 2012 the bridge was hit by a ship and damaged. The reason was a misunderstanding in the radio communication. The bridge

120-657: Was opened in 1871 . Passengers crossing the Limfjord between Nørresundby station and Aalborg station initially had two opportunities: a ferry or crossing the pontoon bridge located further east on foot. However, in 1879 the first railway bridge spanning the Limfjord, the Limfjord Railway Bridge , was opened, and the Vendsyssel railway line was connected with Aalborg station , the Randers–Aalborg railway line as well as

132-531: Was patented (1901) by Theodor Rall. One of the few surviving examples is the Broadway Bridge (1913), in Portland, Oregon. Counterweight A counterweight is a weight that, by applying an opposite force, provides balance and stability of a mechanical system . The purpose of a counterweight is to make lifting the load faster and more efficient, which saves energy and causes less wear and tear on

SECTION 10

#1732876288231

144-580: Was repaired and opened again for traffic on 29 April 2013. The bridge is 403 metres (1,322 ft) long and has a width of 5.7 metres (19 ft). It is a steel truss bridge with nine spans supported by seven piers in the water. The clearance below is 4.4 metres (14 ft) on the Aalborg side and 3.3 metres (11 ft) on the Nørresundby side. It is a bascule bridge with a counterweight of 400 metric tons (390 long tons; 440 short tons). The bridge carries

#230769