Cofferdam - Revision history

Designing Buildings at 07:44, 18 September 2020

2020-09-18T07:44:12Z

← Older revision		Revision as of 07:44, 18 September 2020
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	* The Construction Civil - [http://www.theconstructioncivil.org/cofferdam-types-of-cofferdam/ Types of cofferdam]		* The Construction Civil - [http://www.theconstructioncivil.org/cofferdam-types-of-cofferdam/ Types of cofferdam]

−	[[Category:~~Water~~]] [[Category:~~Construction_techniques~~]] [[Category:~~Products_/_components~~]] [[Category:~~DCN_Product_Knowledge~~]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Water]] [[Category:Construction_techniques]] [[Category:Products_/_components]]

Designing Buildings at 14:01, 29 March 2019

2019-03-29T14:01:45Z

← Older revision		Revision as of 14:01, 29 March 2019
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	* The Construction Civil - [http://www.theconstructioncivil.org/cofferdam-types-of-cofferdam/ Types of cofferdam]		* The Construction Civil - [http://www.theconstructioncivil.org/cofferdam-types-of-cofferdam/ Types of cofferdam]

−	[[Category:Construction_techniques]] [[Category:Products_/_components]]	+	[[Category:Water]] [[Category:Construction_techniques]] [[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

Editor at 16:05, 1 May 2018

2018-05-01T16:05:26Z

← Older revision		Revision as of 16:05, 1 May 2018
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	* Caisson.		* Caisson.
	* Coastal defences.		* Coastal defences.
		+	* Difference between cofferdams and caissons.
	* Driven piles.		* Driven piles.
	* Formwork.		* Formwork.

Editor at 14:51, 1 May 2018

2018-05-01T14:51:36Z

← Older revision		Revision as of 14:51, 1 May 2018
Line 76:		Line 76:
	* Trench box.		* Trench box.
	* Underpinning.		* Underpinning.
		+	* Underwater foundations.
	* Watercourse.		* Watercourse.
	* Water engineering.		* Water engineering.

Editor at 16:00, 13 April 2018

2018-04-13T16:00:53Z

← Older revision		Revision as of 16:00, 13 April 2018
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	* Retaining walls.		* Retaining walls.
	* River engineering.		* River engineering.
−	* Temporary works.
	* Screw piles.		* Screw piles.
	* Sheet piles.		* Sheet piles.
	* Shoring.		* Shoring.
		+	* Temporary works.
		+	* Trench box.
	* Underpinning.		* Underpinning.
	* Watercourse.		* Watercourse.

Editor at 12:10, 21 July 2017

2017-07-21T12:10:22Z

← Older revision		Revision as of 12:10, 21 July 2017
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	Cofferdams are temporary structures used where construction is being carried out in areas submerged in water. They are most commonly used to facilitate the construction or repair of dams, piers and bridges. The aim of a cofferdam is to be as watertight as possible to create a dry area in which to complete the required building works, or at least to limit water ingress to a safe level that can be pumped away.		Cofferdams are temporary structures used where construction is being carried out in areas submerged in water. They are most commonly used to facilitate the construction or repair of dams, piers and bridges. The aim of a cofferdam is to be as watertight as possible to create a dry area in which to complete the required building works, or at least to limit water ingress to a safe level that can be pumped away.

−	Cofferdams must be able to withstand very high pressures and can create a hazardous situation if they are installed incorrectly. They are usually constructed using steel sheet piles driven into the ground and supported by internal braces and cross braces. Timber sheet piles, concrete or a combination of materials can also be used. A cofferdam can be any shape. Its design will be depend on the depth required, the required working area, soil conditions, fluctuations in the water level, and so on.	+	Cofferdams must be able to withstand very high pressures and can create a hazardous situation if they are installed incorrectly. They are usually constructed using steel sheet piles driven into the ground and supported by internal braces and cross braces. Timber sheet piles, concrete or a combination of materials can also be used.
		+
		+	A cofferdam can be any shape. Its design will be depend on the depth required, the required working area, soil conditions, fluctuations in the water level, and so on.

	= Types of cofferdam =		= Types of cofferdam =
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	=== Double-walled ===		=== Double-walled ===

−	Single-walled cofferdams become unfeasible as larger areas are required in deeper water, and so double-walled cofferdams are sometimes necessary. Two walls are built with a gap between them, the thickness of which is dependent upon the depth of water. The general rule is for the thickness of the wall to equal the depth of water up to 3 m, greater depths require 3 m plus half the excess depth. The two wall faces are connected at the top using steel rods placed at close intervals.	+	Single-walled cofferdams become unfeasible as larger areas are required in deeper water, and so double-walled cofferdams are sometimes necessary. Two walls are built with a gap between them, the thickness of which is dependent upon the depth of water.
		+
		+	The general rule is for the thickness of the wall to equal the depth of water up to 3 m, greater depths require 3 m plus half the excess depth. The two wall faces are connected at the top using steel rods placed at close intervals.

	=== Crib ===		=== Crib ===
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	* Screw piles.		* Screw piles.
	* Sheet piles.		* Sheet piles.
		+	* Shoring.
	* Underpinning.		* Underpinning.
	* Watercourse.		* Watercourse.

Editor at 12:46, 12 October 2016

2016-10-12T12:46:14Z

← Older revision		Revision as of 12:46, 12 October 2016
Line 68:		Line 68:
	* Temporary works.		* Temporary works.
	* Screw piles.		* Screw piles.
		+	* Sheet piles.
	* Underpinning.		* Underpinning.
	* Watercourse.		* Watercourse.

Editor at 11:47, 10 August 2016

2016-08-10T11:47:12Z

← Older revision		Revision as of 11:47, 10 August 2016
Line 63:		Line 63:
	* Micropiles.		* Micropiles.
	* Pile foundations.		* Pile foundations.
		+	* Pumps and dewatering equipment.
	* Retaining walls.		* Retaining walls.
	* River engineering.		* River engineering.

Editor at 14:02, 24 May 2016

2016-05-24T14:02:14Z

← Older revision		Revision as of 14:02, 24 May 2016
Line 55:		Line 55:
	* Bridge construction.		* Bridge construction.
	* Caisson.		* Caisson.
		+	* Coastal defences.
	* Driven piles.		* Driven piles.
	* Formwork.		* Formwork.

Editor at 13:32, 4 April 2016

2016-04-04T13:32:08Z

← Older revision		Revision as of 13:32, 4 April 2016
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	* Formwork.		* Formwork.
	* Geothermal pile foundations.		* Geothermal pile foundations.
		+	* Groundwater control in urban areas.
	* Grouting in civil engineering.		* Grouting in civil engineering.
	* Micropiles.		* Micropiles.