Pontoon bridge - Revision history

Editor at 16:44, 23 November 2021

2021-11-23T16:44:31Z

← Older revision		Revision as of 16:44, 23 November 2021
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	In March 2016, Washington State in northwest America opened the world’s longest floating bridge. The ‘State Route 520 Bridge’ (SR520), as it is known, is a six-lane pontoon structure 2.4 km in length. There are three additional pontoon bridges in Washington State.		In March 2016, Washington State in northwest America opened the world’s longest floating bridge. The ‘State Route 520 Bridge’ (SR520), as it is known, is a six-lane pontoon structure 2.4 km in length. There are three additional pontoon bridges in Washington State.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Amphibious Construction.		* Amphibious Construction.
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	* River engineering.		* River engineering.
	* State Route 520 Floating Bridge.		* State Route 520 Floating Bridge.
		+	* Submersible bridge.
	* Swing bridge.		* Swing bridge.
	* Three pieces of infrastructure that have saved lives.		* Three pieces of infrastructure that have saved lives.

Editor at 10:38, 17 September 2021

2021-09-17T10:38:32Z

← Older revision		Revision as of 10:38, 17 September 2021
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	* State Route 520 Floating Bridge.		* State Route 520 Floating Bridge.
	* Swing bridge.		* Swing bridge.
		+	* Three pieces of infrastructure that have saved lives.
	* Underwater foundations.		* Underwater foundations.

	[[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 16:42, 29 July 2021

2021-07-29T16:42:02Z

← Older revision		Revision as of 16:42, 29 July 2021
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	* General Hugh Debbieg military engineer and surveyor.		* General Hugh Debbieg military engineer and surveyor.
	* Maunsell forts.		* Maunsell forts.
		+	* Movable bridge.
	* Navigable aqueduct.		* Navigable aqueduct.
	* Retractable bridge.		* Retractable bridge.

Editor at 17:18, 18 June 2021

2021-06-18T17:18:11Z

← Older revision		Revision as of 17:18, 18 June 2021
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	* Maunsell forts.		* Maunsell forts.
	* Navigable aqueduct.		* Navigable aqueduct.
		+	* Retractable bridge.
	* River engineering.		* River engineering.
	* State Route 520 Floating Bridge.		* State Route 520 Floating Bridge.

Editor at 18:25, 20 May 2021

2021-05-20T18:25:39Z

← Older revision		Revision as of 18:25, 20 May 2021
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	* Amphibious Construction.		* Amphibious Construction.
		+	* Bascule bridge.
	* Bridge construction.		* Bridge construction.
	* Bridges of the world.		* Bridges of the world.

Designing Buildings at 07:33, 27 April 2021

2021-04-27T07:33:09Z

← Older revision		Revision as of 07:33, 27 April 2021
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	= How do pontoon bridges work? =		= How do pontoon bridges work? =

−	Pontoon bridges are constructed on large, water-tight concrete floats, boats, barges or other buoyant structures that are rigidly connected end-to-end, upon which the road deck is constructed. Individual bridge pontoons are built on the land before being floated and towed to the bridge site. Once there, they are connected at each end to grounded approach structures, starting at the edge of the floating structure and then pieced together towards the bridge’s centre. ~~Enormous cables hundreds of feet long~~ hold the pontoons in place, connected to anchors ~~buried deep in the lake bed~~.	+	Pontoon bridges are constructed on large, water-tight concrete floats, boats, barges or other buoyant structures that are rigidly connected end-to-end, upon which the road deck is constructed. Individual bridge pontoons are built on the land before being floated and towed to the bridge site. Once there, they are connected at each end to grounded approach structures, starting at the edge of the floating structure and then pieced together towards the bridge’s centre. Cables hold the pontoons in place, connected to buried anchors.

−	The use of floating bridges is typically limited by the wind and wave forces that are likely to be experienced. The ‘fetch’ is the unobstructed clear distance over the water that wind can travel to the bridge. The longer the fetch, the higher the wind and wave forces will be. Pontoons bend, heave and twist as a result of wind and wave forces, creating large stresses in the pontoons and anchor system. However, even in the event of a ‘100-year storm’ (a storm that statistically has 1% chance of occurring in any given year), the pontoons are designed ~~so that they will not crack, and so the bridge will not sink~~.	+	The use of floating bridges is typically limited by the wind and wave forces that are likely to be experienced. The ‘fetch’ is the unobstructed clear distance over the water that wind can travel to the bridge. The longer the fetch, the higher the wind and wave forces will generally be. Pontoons bend, heave and twist as a result of wind and wave (and sometimes tidal) forces, creating large stresses in the pontoons and anchor system. However, even in the event of a ‘100-year storm’ (a storm that statistically has 1% chance of occurring in any given year), the pontoons are designed to survive.

	Due to the movement associated with a pontoon bridge, they often require more maintenance than traditional structures, even under normal operating conditions.		Due to the movement associated with a pontoon bridge, they often require more maintenance than traditional structures, even under normal operating conditions.
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	= Strategic pontoon bridges =		= Strategic pontoon bridges =

−	The earliest recorded use of a pontoon bridge goes back to Ancient China. While texts indicate ~~its~~ use by the Zhou Dynasty in the 11th century BC, it is believed that temporary pontoon bridges were used several centuries ~~later;~~ permanent pontoon bridges came about in the 2nd century BC during the Qin Dynasty.	+	The earliest recorded use of a pontoon bridge goes back to Ancient China. While texts indicate use by the Zhou Dynasty in the 11th century BC, it is believed that temporary pontoon bridges were used several centuries earlier and permanent pontoon bridges came about in the 2nd century BC during the Qin Dynasty.

	Temporary pontoon bridges were frequently used in Ancient Greek and Roman times. This continued in the middle ages, when they were frequently used in military applications.		Temporary pontoon bridges were frequently used in Ancient Greek and Roman times. This continued in the middle ages, when they were frequently used in military applications.
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	= Permanent pontoon bridges =		= Permanent pontoon bridges =

−	There are some permanent pontoon bridges in use around the world in places such as Australia, India, Canada and so on. As permanent structures, pontoon bridges require ~~extremely~~ deep water and are practical in places where the softness of the ground beneath the bridge makes it unsuitable for safe pier construction.	+	There are some permanent pontoon bridges in use around the world in places such as Australia, India, Canada and so on. As permanent structures, pontoon bridges generally require deep water and are practical in places where the softness of the ground beneath the bridge makes it unsuitable for safe pier construction.

	In March 2016, Washington State in northwest America opened the world’s longest floating bridge. The ‘State Route 520 Bridge’ (SR520), as it is known, is a six-lane pontoon structure 2.4 km in length. There are three additional pontoon bridges in Washington State.		In March 2016, Washington State in northwest America opened the world’s longest floating bridge. The ‘State Route 520 Bridge’ (SR520), as it is known, is a six-lane pontoon structure 2.4 km in length. There are three additional pontoon bridges in Washington State.

Editor at 18:32, 26 April 2021

2021-04-26T18:32:56Z

← Older revision		Revision as of 18:32, 26 April 2021
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	\| [[File:EvergreenPontoonBridge.jpg\|link=File:EvergreenPontoonBridge.jpg]]		\| [[File:EvergreenPontoonBridge.jpg\|link=File:EvergreenPontoonBridge.jpg]]
	\|-		\|-
−	\| The Evergreen Point Floating Bridge in Washington State, carrying State Route 520 over Lake Washington, seen from the north side bicycle and pedestrian trail from the west high rise.	+	\| The Evergreen Point Floating Bridge in Washington State, carrying State Route 520 over Lake Washington, seen from the north side bicycle and pedestrian trail from the west high rise. It is the world's longest pontoon bridge.
	\|}		\|}

Editor at 18:31, 26 April 2021

2021-04-26T18:31:04Z

← Older revision		Revision as of 18:31, 26 April 2021
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	{\|		{\|
−	\| [[File:EvergreenPontoonBridge.jpg]]	+	\| [[File:EvergreenPontoonBridge.jpg\|link=File:EvergreenPontoonBridge.jpg]]
	\|-		\|-
	\| The Evergreen Point Floating Bridge in Washington State, carrying State Route 520 over Lake Washington, seen from the north side bicycle and pedestrian trail from the west high rise.		\| The Evergreen Point Floating Bridge in Washington State, carrying State Route 520 over Lake Washington, seen from the north side bicycle and pedestrian trail from the west high rise.
	\|}		\|}

−	Introduction	+	= Introduction =

	Bridges are a common feature of the built environment and one of the key elements of civil engineering. 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 pontoon (or ponton) bridge. These are also referred to as floating bridges.		Bridges are a common feature of the built environment and one of the key elements of civil engineering. 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 pontoon (or ponton) bridge. These are also referred to as floating bridges.

−	How do pontoon bridges work?	+	= How do pontoon bridges work? =

	Pontoon bridges are constructed on large, water-tight concrete floats, boats, barges or other buoyant structures that are rigidly connected end-to-end, upon which the road deck is constructed. Individual bridge pontoons are built on the land before being floated and towed to the bridge site. Once there, they are connected at each end to grounded approach structures, starting at the edge of the floating structure and then pieced together towards the bridge’s centre. Enormous cables hundreds of feet long hold the pontoons in place, connected to anchors buried deep in the lake bed.		Pontoon bridges are constructed on large, water-tight concrete floats, boats, barges or other buoyant structures that are rigidly connected end-to-end, upon which the road deck is constructed. Individual bridge pontoons are built on the land before being floated and towed to the bridge site. Once there, they are connected at each end to grounded approach structures, starting at the edge of the floating structure and then pieced together towards the bridge’s centre. Enormous cables hundreds of feet long hold the pontoons in place, connected to anchors buried deep in the lake bed.
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	The use of floating bridges is typically limited by the wind and wave forces that are likely to be experienced. The ‘fetch’ is the unobstructed clear distance over the water that wind can travel to the bridge. The longer the fetch, the higher the wind and wave forces will be. Pontoons bend, heave and twist as a result of wind and wave forces, creating large stresses in the pontoons and anchor system. However, even in the event of a ‘100-year storm’ (a storm that statistically has 1% chance of occurring in any given year), the pontoons are designed so that they will not crack, and so the bridge will not sink.		The use of floating bridges is typically limited by the wind and wave forces that are likely to be experienced. The ‘fetch’ is the unobstructed clear distance over the water that wind can travel to the bridge. The longer the fetch, the higher the wind and wave forces will be. Pontoons bend, heave and twist as a result of wind and wave forces, creating large stresses in the pontoons and anchor system. However, even in the event of a ‘100-year storm’ (a storm that statistically has 1% chance of occurring in any given year), the pontoons are designed so that they will not crack, and so the bridge will not sink.

−	Due to the movement associated with a pontoon bridge, they often require more maintenance, even under normal operating conditions.	+	Due to the movement associated with a pontoon bridge, they often require more maintenance than traditional structures, even under normal operating conditions.

−	Strategic pontoon bridges	+	= Strategic pontoon bridges =

	The earliest recorded use of a pontoon bridge goes back to Ancient China. While texts indicate its use by the Zhou Dynasty in the 11th century BC, it is believed that temporary pontoon bridges were used several centuries later; permanent pontoon bridges came about in the 2nd century BC during the Qin Dynasty.		The earliest recorded use of a pontoon bridge goes back to Ancient China. While texts indicate its use by the Zhou Dynasty in the 11th century BC, it is believed that temporary pontoon bridges were used several centuries later; permanent pontoon bridges came about in the 2nd century BC during the Qin Dynasty.
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	Temporary pontoon bridges could be built quickly and then either destroyed or removed and carried along with troops. Their flexibility prevented enemy forces from using the structures.		Temporary pontoon bridges could be built quickly and then either destroyed or removed and carried along with troops. Their flexibility prevented enemy forces from using the structures.

−	Permanent pontoon bridges	+	= Permanent pontoon bridges =

	There are some permanent pontoon bridges in use around the world in places such as Australia, India, Canada and so on. As permanent structures, pontoon bridges require extremely deep water and are practical in places where the softness of the ground beneath the bridge makes it unsuitable for safe pier construction.		There are some permanent pontoon bridges in use around the world in places such as Australia, India, Canada and so on. As permanent structures, pontoon bridges require extremely deep water and are practical in places where the softness of the ground beneath the bridge makes it unsuitable for safe pier construction.

Editor: Created page with "{| | File:EvergreenPontoonBridge.jpg |- | The Evergreen Point Floating Bridge in Washington State, carrying State Route 520 over Lake Washington, seen from the north side bic..."

2021-04-26T18:29:55Z

Created page with "{| | File:EvergreenPontoonBridge.jpg |- | The Evergreen Point Floating Bridge in Washington State, carrying State Route 520 over Lake Washington, seen from the north side bic..."

New page

{|
| [[File:EvergreenPontoonBridge.jpg]]
|-
| The Evergreen Point Floating Bridge in Washington State, carrying State Route 520 over Lake Washington, seen from the north side bicycle and pedestrian trail from the west high rise.
|}

Introduction

Bridges are a common feature of the built environment and one of the key elements of civil engineering. 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 pontoon (or ponton) bridge. These are also referred to as floating bridges.

How do pontoon bridges work?

Pontoon bridges are constructed on large, water-tight concrete floats, boats, barges or other buoyant structures that are rigidly connected end-to-end, upon which the road deck is constructed. Individual bridge pontoons are built on the land before being floated and towed to the bridge site. Once there, they are connected at each end to grounded approach structures, starting at the edge of the floating structure and then pieced together towards the bridge’s centre. Enormous cables hundreds of feet long hold the pontoons in place, connected to anchors buried deep in the lake bed.

The use of floating bridges is typically limited by the wind and wave forces that are likely to be experienced. The ‘fetch’ is the unobstructed clear distance over the water that wind can travel to the bridge. The longer the fetch, the higher the wind and wave forces will be. Pontoons bend, heave and twist as a result of wind and wave forces, creating large stresses in the pontoons and anchor system. However, even in the event of a ‘100-year storm’ (a storm that statistically has 1% chance of occurring in any given year), the pontoons are designed so that they will not crack, and so the bridge will not sink.

Due to the movement associated with a pontoon bridge, they often require more maintenance, even under normal operating conditions.

Strategic pontoon bridges

The earliest recorded use of a pontoon bridge goes back to Ancient China. While texts indicate its use by the Zhou Dynasty in the 11th century BC, it is believed that temporary pontoon bridges were used several centuries later; permanent pontoon bridges came about in the 2nd century BC during the Qin Dynasty.

Temporary pontoon bridges were frequently used in Ancient Greek and Roman times. This continued in the middle ages, when they were frequently used in military applications.

As tactical structures, they were used during emergency situations, such as natural disasters or wartime conflicts. They were put in place either when conventional bridge construction was thought to be cost prohibitive or when additional flexibility (such as elevation or removal for the passing of waterway traffic) was necessary.

Temporary pontoon bridges could be built quickly and then either destroyed or removed and carried along with troops. Their flexibility prevented enemy forces from using the structures.

Permanent pontoon bridges

There are some permanent pontoon bridges in use around the world in places such as Australia, India, Canada and so on. As permanent structures, pontoon bridges require extremely deep water and are practical in places where the softness of the ground beneath the bridge makes it unsuitable for safe pier construction.

In March 2016, Washington State in northwest America opened the world’s longest floating bridge. The ‘State Route 520 Bridge’ (SR520), as it is known, is a six-lane pontoon structure 2.4 km in length. There are three additional pontoon bridges in Washington State.

= Related articles on Designing Buildings Wiki =

* Amphibious Construction.
* Bridge construction.
* Bridges of the world.
* Bridge structures.
* Dredging.
* General Hugh Debbieg military engineer and surveyor.
* Maunsell forts.
* Navigable aqueduct.
* River engineering.
* State Route 520 Floating Bridge.
* Swing bridge.
* Underwater foundations.

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