A tilt bridge is a type of

moveable bridge A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats or barges. In American English, the term is synonymous with , and the latter is the common term, but drawbridge can be limited to the narrower, historical d ...

which rotates about fixed endpoints rather than lifting or bending, as with a

drawbridge A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat. In some forms of English, including American English, the word ''drawbridge'' commonly refers to all types of moveable ...

. The tilting

Gateshead Millennium Bridge The Gateshead Millennium Bridge is a pedestrian and cyclist tilt bridge spanning the River Tyne between Gateshead arts quarter on the south bank and Newcastle upon Tyne's Quayside area on the north bank. It was the first tilting bridge ever t ...

spanning the

River Tyne The River Tyne is a river in North East England. Its length (excluding tributaries) is . It is formed by the North Tyne and the South Tyne, which converge at Warden Rock near Hexham in Northumberland at a place dubbed 'The Meeting of the Wate ...

between

Gateshead Gateshead () is a large town in northern England. It is on the River Tyne's southern bank, opposite Newcastle upon Tyne, Newcastle to which it is joined by seven bridges. The town contains the Gateshead Millennium Bridge, Millennium Bridge, Sage ...

on the south bank and

Newcastle upon Tyne Newcastle upon Tyne ( RP: , ), or simply Newcastle, is a city and metropolitan borough in Tyne and Wear, England. The city is located on the River Tyne's northern bank and forms the largest part of the Tyneside built-up area. Newcastle is ...

, England, on the north is a pedestrian bridge with two large

hydraulic rams A hydraulic ram, or hydram, is a cyclic water pump powered by hydropower. It takes in water at one " hydraulic head" (pressure) and flow rate, and outputs water at a higher hydraulic head and lower flow rate. The device uses the water hammer e ...

at each side that tilt the structure back allowing small watercraft to pass under. The pedestrian and cycle pathway is an almost-horizontal curve, suspended above the river from a just-beyond-the-vertical

parabolic arch A parabolic arch is an arch in the shape of a parabola.Article about parabolic arch by The Free DictionaryParabolic arch , Article about parabolic arch by The Free Dictionary accessdate: March 2, 2017 In structures, their curve represents an effi ...

. To raise the bridge, this whole assembly rotates as a single, rigid structure. As the arch tilts lower, the pathway rises, each counterbalancing the other so that a minimum of energy is needed. The resultant appearance in motion leads to it sometimes being called the "eyelid bridge", since its shape is akin to the blinking of an eye if seen from along the river. Two further tilt bridges are known to exist in

Belgium Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeast, France to th ...

, both constructed in 2011: the (Scheepsdalebridge) in

Brugge Bruges ( , nl, Brugge ) is the capital and largest city of the province of West Flanders in the Flemish Region of Belgium, in the northwest of the country, and the sixth-largest city of the country by population. The area of the whole city a ...

and the over the river

Dender The Dender (Dutch, ) or Dendre ( French, ) is a 65-kilometre (40 mi) long river in Belgium, the right tributary of the river Scheldt. The confluence of the two rivers is in the Belgian town of Dendermonde. The Western or Little Dender is 22 kilome ...

in Aalst. The former combines the working mechanisms of a rolling lift bascule bridge and a tilt bridge: the bridge is mounted on two lifting arms which roll along

racks Rack or racks may refer to: Storage and installation * Amp rack, short for amplifier rack, a piece of furniture in which amplifiers are mounted * Bicycle rack, a frame for storing bicycles when not in use * Bustle rack, a type of storage bin m ...

, positioned parallel to the navigable way, tilting up the bridge leaf providing a clearance for passing ships. The latter is mounted on two lifting arms which are connected to fixed pivot points a few feet downstream from the bridge leaf.

Gallery

File:Nieuwe_Scheepsdalebrug.jpg, Scheepsdalebrug during construction in raised position File:Sint_Annabrug.png, Sint-Annabrug in Aalst, Belgium File:Sint_Annabrug_Open.png, Sint-Annabrug raised to allow a vessel to pass through File:Sint_Annabrug_Open_Voor_01.png, Frontal view of the Sint-Annabrug in raised position {{DEFAULTSORT:Tilt Bridge Bridges by structural type Footbridges Moveable bridges English inventions