Bascule bridge - Revision history

Editor at 16:27, 10 February 2022

2022-02-10T16:27:51Z

← Older revision		Revision as of 16:27, 10 February 2022
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−	= Related articles on Designing Buildings ~~Wiki~~ =	+	--[[User:Heidi_Schwartz\|Heidi Schwartz]]
		+
		+	= Related articles on Designing Buildings =

	* Bridge construction.		* Bridge construction.
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	* Retractable bridge.		* Retractable bridge.
	* River engineering.		* River engineering.
		+	* Strut.
	* Swing bridge.		* Swing bridge.

	[[Category:DCN_Definition]] [[Category:Definitions]] [[Category:History]] [[Category:Water]] [[Category:Construction_techniques]]		[[Category:DCN_Definition]] [[Category:Definitions]] [[Category:History]] [[Category:Water]] [[Category:Construction_techniques]]

Editor at 16:38, 29 July 2021

2021-07-29T16:38:15Z

← Older revision		Revision as of 16:38, 29 July 2021
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	* Bridge structures.		* Bridge structures.
	* Counterweights.		* Counterweights.
		+	* Movable bridge.
	* Pontoon bridge.		* Pontoon bridge.
	* Railway engineering.		* Railway engineering.

Editor at 17:15, 18 June 2021

2021-06-18T17:15:20Z

← Older revision		Revision as of 17:15, 18 June 2021
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	* Pontoon bridge.		* Pontoon bridge.
	* Railway engineering.		* Railway engineering.
		+	* Retractable bridge.
	* River engineering.		* River engineering.
	* Swing bridge.		* Swing bridge.

	[[Category:DCN_Definition]] [[Category:Definitions]] [[Category:History]] [[Category:Water]] [[Category:Construction_techniques]]		[[Category:DCN_Definition]] [[Category:Definitions]] [[Category:History]] [[Category:Water]] [[Category:Construction_techniques]]

Designing Buildings at 09:44, 21 May 2021

2021-05-21T09:44:02Z

← Older revision		Revision as of 09:44, 21 May 2021
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	\| [[File:BasculeTowerBridge.jpg\|link=File:BasculeTowerBridge.jpg]]		\| [[File:BasculeTowerBridge.jpg\|link=File:BasculeTowerBridge.jpg]]
	\|-		\|-
−	\| ~~This image shows~~ London's illuminated Tower Bridge opening its bascule portion as PS Waverley approaches to pass underneath ~~its suspension portion~~.	+	\| London's illuminated Tower Bridge opening its bascule portion as PS Waverley approaches to pass underneath.
	\|}		\|}

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	Bridges are a common feature of the built environment and one of the key elements of civil engineering. The basic principles of bridge design are dependent on the load-bearing structure. These are generally beam, arch or suspension structures.		Bridges are a common feature of the built environment and one of the key elements of civil engineering. The basic principles of bridge design are dependent on the load-bearing structure. These are generally beam, arch or suspension structures.

−	~~Aside from their load-bearing structure, some~~ bridges are defined by other characteristics~~. For instance~~, a movable bridge is defined by its ~~purpose or~~ functionality.	+	Some bridges are also defined by other characteristics, for example a movable bridge is defined by its functionality. These bridges are designed in a way that allows them to accommodate different situations and different types of traffic. One kind of movable bridge is a bascule bridge or lifting bridge.
−		+
−	These bridges are designed in a way that allows them to accommodate different situations and ~~the flow of~~ different types of traffic. One kind of movable bridge is a bascule bridge or lifting bridge.	+

	= Bascule bridges =		= Bascule bridges =

−	This type of bridge can be raised ~~quickly~~ in order to provide clearance for waterway traffic. Bascule bridges are generally considered to be structurally reliable and economical (both in terms of construction and operation).	+	This type of bridge can be raised in order to provide clearance for waterway traffic. Bascule bridges are generally considered to be structurally reliable and economical (both in terms of construction and operation).

−	The term bascule comes from the French word associated with ~~several types of~~ balancing mechanical devices. In the United States and other parts of the world, a bascule bridge may be referred to as a drawbridge or draw bridge. In Great Britain, the term drawbridge is more commonly associated with castle entrances.	+	The term bascule comes from the French word associated with balancing mechanical devices. In the United States and other parts of the world, a bascule bridge may be referred to as a drawbridge or draw bridge. In Great Britain, the term drawbridge is more commonly associated with castle entrances.

	= Operations =		= Operations =

−	Bascule bridges ~~are fixed. They~~ are supported on an axis ~~that is~~ perpendicular to ~~the bridge’s~~ longitudinal centerline ~~axis~~. ~~The~~ centre of gravity ~~for the bridge serves as the place where it lifts~~. This creates a balance for the lifted span(s) on both sides of ~~its~~ horizontal pivotal axis.	+	Bascule bridges are supported on an axis perpendicular to their longitudinal centerline. They lift along their centre of gravity. This creates a balance for the lifted span(s) on both sides of the horizontal pivotal axis.

	The balance of weight may be intentionally adjusted to accommodate frequent activity. For instance, if the bridge needs to be opened for frequent waterway traffic, its weight distribution will be designed for this purpose. This is referred to as counterweight heavy. If the tendency is to keep the bridge closed, then the weight distribution will be designed for this purpose. This is referred to as heavy span.		The balance of weight may be intentionally adjusted to accommodate frequent activity. For instance, if the bridge needs to be opened for frequent waterway traffic, its weight distribution will be designed for this purpose. This is referred to as counterweight heavy. If the tendency is to keep the bridge closed, then the weight distribution will be designed for this purpose. This is referred to as heavy span.
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	= Platforms =		= Platforms =

−	Bascule bridges tend to have one platform spanning from an area or two that are joined in the middle. The platforms are sometimes referred to as a ~~leaf~~ or ~~span~~. Bridges with one platform are called single-leaf; those with two are called double-leaf. In rare instances, there are also triple- and quadruple-leaf structures.	+	Bascule bridges tend to have one platform spanning from an area or two that are joined in the middle. The platforms are sometimes referred to as a leafs or spans. Bridges with one platform are called single-leaf; those with two are called double-leaf. In rare instances, there are also triple- and quadruple-leaf structures.

	{\|		{\|
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	In 1176, Peter Colechurch began work on the original version of London Bridge (commonly referred to as Old London Bridge). This stone structure included a wooden drawbridge which was operational until the late 1400s. When Old London Bridge was replaced in 1831, the new structure did not include a drawbridge (nor did its subsequent replacement, which opened in 1972).		In 1176, Peter Colechurch began work on the original version of London Bridge (commonly referred to as Old London Bridge). This stone structure included a wooden drawbridge which was operational until the late 1400s. When Old London Bridge was replaced in 1831, the new structure did not include a drawbridge (nor did its subsequent replacement, which opened in 1972).

−	By the time of the Industrial Revolution, the adoption of modern technologies and introduction of new power sources made it possible to create large spans ~~out of different materials~~. When the double-leaf Tower Bridge was built in the late 1800s, it incorporated both bascule and suspension bridge ~~designs~~ that could accommodate multiple types of traffic.	+	By the time of the Industrial Revolution, the adoption of modern technologies and the introduction of new power sources made it possible to create large spans. When the double-leaf Tower Bridge was built in the late 1800s, it incorporated both bascule and suspension bridge elements that could accommodate multiple types of traffic.

	= Noteworthy bascule bridges =		= Noteworthy bascule bridges =
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	\|}		\|}

−	1925 - Corporation Bridge, Grimsby. This electrically powered Scherzer rolling lift bascule bridge was built to replace an earlier swing bridge dating to 1872. It is a Grade II Listed structure.	+	1925 - Corporation Bridge, Grimsby. This electrically powered Scherzer rolling lift bascule bridge was built to replace an earlier swing bridge dating from 1872. It is a Grade II Listed structure.

	{\|		{\|

Editor at 18:48, 20 May 2021

2021-05-20T18:48:18Z

← Older revision		Revision as of 18:48, 20 May 2021
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	{\|		{\|
−	\| [[File:BroadwayBridgePortland.jpg\|link=File:BroadwayBridgePortland.jpg]]Broadway Bridge in Portland, Oregon.	+	\| [[File:BroadwayBridgePortland.jpg\|link=File:BroadwayBridgePortland.jpg]]Broadway Bridge in Portland, Oregon (USA).
	\|}		\|}

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	[[File:BasculeWhiteCartScot.jpg\|link=File:BasculeWhiteCartScot.jpg]]		[[File:BasculeWhiteCartScot.jpg\|link=File:BasculeWhiteCartScot.jpg]]

−	White Cart Bridge, Renfrew (Scotland)	+	White Cart Bridge, Renfrew (Scotland).
	\|}		\|}

Editor at 18:47, 20 May 2021

2021-05-20T18:47:21Z

← Older revision		Revision as of 18:47, 20 May 2021
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	= Platforms =		= Platforms =

−	Bascule bridges tend to have one platform spanning from an area or two that are joined in the middle. The platforms are sometimes referred to as a leaf or span. Bridges with one platform are called single ~~leafed~~; those with two are called double-~~leafed~~. In rare instances, there are also triple and quadruple leaf structures.	+	Bascule bridges tend to have one platform spanning from an area or two that are joined in the middle. The platforms are sometimes referred to as a leaf or span. Bridges with one platform are called single-leaf; those with two are called double-leaf. In rare instances, there are also triple- and quadruple-leaf structures.

	{\|		{\|
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	[[File:DoubleLeafBascule.gif\|link=File:DoubleLeafBascule.gif]]		[[File:DoubleLeafBascule.gif\|link=File:DoubleLeafBascule.gif]]

−	This animation depicts a double leaf bascule bridge in operation.	+	This animation depicts a double-leaf bascule bridge in operation.
	\|}		\|}

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	= Origins of bascule bridges =		= Origins of bascule bridges =

−	There is evidence that bascule bridges were used in ancient times. In the Middle Ages, they were used for defensive purposes in Europe, operated by counterweights and winches.	+	There is evidence that bascule bridges were used in ancient times. In the Middle Ages, they were used for defensive purposes in Europe. These drawbridges were typically operated by counterweights and winches.

−	In 1176, Peter Colechurch began work on the original version of London Bridge (commonly referred to as Old London Bridge). This stone structure included a wooden drawbridge, which was operational until the late 1400s. When Old London Bridge was replaced in 1831, the new structure did not include a drawbridge (nor ~~does~~ its subsequent replacement, which opened in 1972).	+	In 1176, Peter Colechurch began work on the original version of London Bridge (commonly referred to as Old London Bridge). This stone structure included a wooden drawbridge which was operational until the late 1400s. When Old London Bridge was replaced in 1831, the new structure did not include a drawbridge (nor did its subsequent replacement, which opened in 1972).

−	By the time of the Industrial Revolution, the adoption of modern technologies and introduction of new power sources made it possible to create large spans out of different materials. When the double-leaf Tower Bridge was built in the late 1800s, it incorporated both bascule and suspension bridge ~~design~~ that could accommodate multiple types of traffic.	+	By the time of the Industrial Revolution, the adoption of modern technologies and introduction of new power sources made it possible to create large spans out of different materials. When the double-leaf Tower Bridge was built in the late 1800s, it incorporated both bascule and suspension bridge designs that could accommodate multiple types of traffic.

	= Noteworthy bascule bridges =		= Noteworthy bascule bridges =
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	In addition to Tower Bridge, other bascule bridges in the UK include:		In addition to Tower Bridge, other bascule bridges in the UK include:

−	1923 - White Cart Bridge, Renfrew. This Scherzer rolling lift bascule bridge is still capable of opening, which allows the Doosan Babcock factory to move large loads by river.	+	1923 - White Cart Bridge, Renfrew. This Scherzer rolling lift bascule bridge is still capable of opening, which allows the Doosan Babcock factory to move large loads on the river.

	{\|		{\|
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	\|}		\|}

−	1925 - Corporation Bridge, Grimsby. This electrically powered Scherzer rolling lift bascule bridge was built to replace an earlier swing bridge dating to 1872. It is a Grade II Listed ~~Building~~.	+	1925 - Corporation Bridge, Grimsby. This electrically powered Scherzer rolling lift bascule bridge was built to replace an earlier swing bridge dating to 1872. It is a Grade II Listed structure.

	{\|		{\|
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	\|}		\|}

−	1932 - Bascule Bridge, Stanley Dock, Liverpool. The Grade II Listed bascule bridge ~~was built~~ in Liverpool's docklands~~. It~~ is only one of a handful of its type in the UK.	+	1932 - Bascule Bridge, Stanley Dock, Liverpool. The Grade II Listed bascule bridge in Liverpool's docklands is only one of a handful of its type in the UK.

	{\|		{\|

Editor at 18:42, 20 May 2021

2021-05-20T18:42:28Z

← Older revision		Revision as of 18:42, 20 May 2021
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	= Origins of bascule bridges =		= Origins of bascule bridges =

−	There is evidence that bascule bridges ~~have been~~ in ~~operation since~~ ancient times. In the Middle Ages, they were used for defensive purposes in Europe, operated by counterweights and winches.	+	There is evidence that bascule bridges were used in ancient times. In the Middle Ages, they were used for defensive purposes in Europe, operated by counterweights and winches.

	In 1176, Peter Colechurch began work on the original version of London Bridge (commonly referred to as Old London Bridge). This stone structure included a wooden drawbridge, which was operational until the late 1400s. When Old London Bridge was replaced in 1831, the new structure did not include a drawbridge (nor does its subsequent replacement, which opened in 1972).		In 1176, Peter Colechurch began work on the original version of London Bridge (commonly referred to as Old London Bridge). This stone structure included a wooden drawbridge, which was operational until the late 1400s. When Old London Bridge was replaced in 1831, the new structure did not include a drawbridge (nor does its subsequent replacement, which opened in 1972).

Editor at 18:33, 20 May 2021

2021-05-20T18:33:58Z

← Older revision		Revision as of 18:33, 20 May 2021
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	Bridges are a common feature of the built environment and one of the key elements of civil engineering. The basic principles of bridge design are dependent on the load-bearing structure. These are generally beam, arch or suspension structures.		Bridges are a common feature of the built environment and one of the key elements of civil engineering. The basic principles of bridge design are dependent on the load-bearing structure. These are generally beam, arch or suspension structures.

−	~~= Bascule~~ bridges =	+	Aside from their load-bearing structure, some bridges are defined by other characteristics. For instance, a movable bridge is defined by its purpose or functionality.

−	~~Movable~~ bridges are designed in a way that allows them to accommodate different situations and the flow of different types of traffic. One kind of movable bridge is a bascule bridge or lifting bridge.	+	These bridges are designed in a way that allows them to accommodate different situations and the flow of different types of traffic. One kind of movable bridge is a bascule bridge or lifting bridge.
		+
		+	= Bascule bridges =

	This type of bridge can be raised quickly in order to provide clearance for waterway traffic. Bascule bridges are generally considered to be structurally reliable and economical (both in terms of construction and operation).		This type of bridge can be raised quickly in order to provide clearance for waterway traffic. Bascule bridges are generally considered to be structurally reliable and economical (both in terms of construction and operation).
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	{\|		{\|
	\|width="100%"\|		\|width="100%"\|
−	[[File:DoubleLeafBascule.gif]]	+	[[File:DoubleLeafBascule.gif\|link=File:DoubleLeafBascule.gif]]

	This animation depicts a double leaf bascule bridge in operation.		This animation depicts a double leaf bascule bridge in operation.

Editor at 18:22, 20 May 2021

2021-05-20T18:22:02Z

← Older revision		Revision as of 18:22, 20 May 2021
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	Bascule bridges tend to have one platform spanning from an area or two that are joined in the middle. The platforms are sometimes referred to as a leaf or span. Bridges with one platform are called single leafed; those with two are called double-leafed. In rare instances, there are also triple and quadruple leaf structures.		Bascule bridges tend to have one platform spanning from an area or two that are joined in the middle. The platforms are sometimes referred to as a leaf or span. Bridges with one platform are called single leafed; those with two are called double-leafed. In rare instances, there are also triple and quadruple leaf structures.
		+
		+	{\|
		+	\|width="100%"\|
		+	[[File:DoubleLeafBascule.gif]]
		+
		+	This animation depicts a double leaf bascule bridge in operation.
		+	\|}

	These platforms are often controlled by a counterweight that balances them. Counterweights require very little energy to operate. This means that the bridge can be opened quickly for water traffic to pass underneath.		These platforms are often controlled by a counterweight that balances them. Counterweights require very little energy to operate. This means that the bridge can be opened quickly for water traffic to pass underneath.

Editor at 18:15, 20 May 2021

2021-05-20T18:15:52Z

← Older revision		Revision as of 18:15, 20 May 2021
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	* Fixed trunnion (or Chicago).		* Fixed trunnion (or Chicago).
	* Rolling lift trunnion (or Scherzer).		* Rolling lift trunnion (or Scherzer).
−	* Rall type (a hybrid construction that combines a rolling lift approach with other methods of operation).	+	* Rall type (a hybrid construction that combines a rolling lift counterweight approach with other methods of operation).

	There are also rolling bascule bridges that do not use counterweights. Instead, they are lifted by a gear that rolls along a horizontal rack.		There are also rolling bascule bridges that do not use counterweights. Instead, they are lifted by a gear that rolls along a horizontal rack.
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	{\|		{\|
	\|width="100%"\|		\|width="100%"\|
−	[[File:BasculeBannColeraine.jpg]]	+	[[File:BasculeBannColeraine.jpg\|link=File:BasculeBannColeraine.jpg]]

	Bann Bridge, Coleraine (Northern Ireland).		Bann Bridge, Coleraine (Northern Ireland).
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	{\|		{\|
	\|width="100%"\|		\|width="100%"\|
−	[[File:BasculeStanleyLiverpool.jpg]]	+	[[File:BasculeStanleyLiverpool.jpg\|link=File:BasculeStanleyLiverpool.jpg]]

	Bascule Bridge, Stanley Dock, Liverpool (England).		Bascule Bridge, Stanley Dock, Liverpool (England).