Diaphragm wall - Revision history

Designing Buildings at 08:21, 6 May 2021

2021-05-06T08:21:55Z

← Older revision		Revision as of 08:21, 6 May 2021
Line 13:		Line 13:
	The high cost of diaphragm walls can make them uneconomic unless they can be incorporated into part of a building structure. As such, they are suited for deep basements, underground car parks and rail stations, tunnel approaches, underpasses, deep shafts for tunnel ventilation, pumping stations, and so on.		The high cost of diaphragm walls can make them uneconomic unless they can be incorporated into part of a building structure. As such, they are suited for deep basements, underground car parks and rail stations, tunnel approaches, underpasses, deep shafts for tunnel ventilation, pumping stations, and so on.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* Basement excavation.		* Basement excavation.
Line 21:		Line 19:
	* Crosswall construction.		* Crosswall construction.
	* Curtain wall.		* Curtain wall.
		+	* Diaphragm.
	* Excavating plant.		* Excavating plant.
	* Ground anchor.		* Ground anchor.

Designing Buildings at 10:35, 2 September 2020

2020-09-02T10:35:52Z

← Older revision		Revision as of 10:35, 2 September 2020
Line 41:		Line 41:
	* ‘Building Construction Handbook’ (6th ed.), CHUDLEY, R., GREENO, R., Butterworth-Heinemann (2007)		* ‘Building Construction Handbook’ (6th ed.), CHUDLEY, R., GREENO, R., Butterworth-Heinemann (2007)

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

Designing Buildings: Reverted edits by 94.66.220.96 (talk) to last revision by Editor

2019-12-31T07:09:01Z

Reverted edits by 94.66.220.96 (talk) to last revision by Editor

← Older revision		Revision as of 07:09, 31 December 2019
Line 41:		Line 41:
	* ‘Building Construction Handbook’ (6th ed.), CHUDLEY, R., GREENO, R., Butterworth-Heinemann (2007)		* ‘Building Construction Handbook’ (6th ed.), CHUDLEY, R., GREENO, R., Butterworth-Heinemann (2007)

−	[[Category:~~Conservation~~]] [[Category:~~Construction_techniques~~]] [[Category:~~Products_/_components~~]]	+	[[Category:Construction_techniques]] [[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

94.66.220.96 at 19:27, 30 December 2019

2019-12-30T19:27:46Z

← Older revision		Revision as of 19:27, 30 December 2019
Line 41:		Line 41:
	* ‘Building Construction Handbook’ (6th ed.), CHUDLEY, R., GREENO, R., Butterworth-Heinemann (2007)		* ‘Building Construction Handbook’ (6th ed.), CHUDLEY, R., GREENO, R., Butterworth-Heinemann (2007)

−	[[Category:Construction_techniques]] [[Category:Products_/_components]]	+	[[Category:Conservation]] [[Category:Construction_techniques]] [[Category:Products_/_components]]

Editor at 17:41, 30 August 2019

2019-08-30T17:41:29Z

← Older revision		Revision as of 17:41, 30 August 2019
Line 31:		Line 31:
	* Sheet piles.		* Sheet piles.
	* Substructure.		* Substructure.
		+	* Trench.
	* Trombe wall.		* Trombe wall.
	* Wall ties.		* Wall ties.

Editor at 13:17, 17 January 2018

2018-01-17T13:17:12Z

← Older revision		Revision as of 13:17, 17 January 2018
Line 5:		Line 5:
	Diaphragm walls are suitable for most subsoils and their installation generates only a small amount of vibration and noise, which increases their suitability for works carried out close to existing structures. In addition, floor slab connections and recessed formwork can be incorporated into the walls.		Diaphragm walls are suitable for most subsoils and their installation generates only a small amount of vibration and noise, which increases their suitability for works carried out close to existing structures. In addition, floor slab connections and recessed formwork can be incorporated into the walls.

−	The walls generally range in thickness from 500-1,500 mm and can be excavated to depths of over 50 m. Excavation is typically carried out using rope-suspended mechanical or hydraulically-operated grabs. Specific ground conditions or greater depths may require the use of hydromills – hydraulically-operated reverse circulation trench cutters – to penetrate into hard rock by ‘cutting’ rather than ‘digging’. Hydromills can achieve depths of up to 80 m.	+	The walls generally range in thickness from 500 - 1,500 mm and can be excavated to depths of over 50 m. Excavation is typically carried out using rope-suspended mechanical or hydraulically-operated grabs. Specific ground conditions or greater depths may require the use of hydromills – hydraulically-operated reverse circulation trench cutters – to penetrate into hard rock by ‘cutting’ rather than ‘digging’. Hydromills can achieve depths of up to 80 m.

−	The excavation stability is maintained by the use of a drilling fluid, usually a bentonite slurry. This is a controlled mixture that has thixotropic properties, meaning that it exerts a pressure in excess of the earth and hydrostatic pressures on the sides of the excavation. The walls are constructed, using reinforced or unreinforced concrete, in discrete panel lengths generally ranging between 2.5-7 m. Purpose-made stop ends can be used to form the joints between adjacent panels, with a water bar incorporated across the joints. More complicated arrangements such as ‘L’ or ‘T’-shaped panels can be constructed where additional bending moment capacity or wall stiffness is required.	+	The excavation stability is maintained by the use of a drilling fluid, usually a bentonite slurry. This is a controlled mixture that has thixotropic properties, meaning that it exerts a pressure in excess of the earth and hydrostatic pressures on the sides of the excavation. The walls are constructed, using reinforced or unreinforced concrete, in discrete panel lengths generally ranging between 2.5 - 7 m. Purpose-made stop ends can be used to form the joints between adjacent panels, with a water bar incorporated across the joints. More complicated arrangements such as ‘L’ or ‘T’-shaped panels can be constructed where additional bending moment capacity or wall stiffness is required.

	Precast concrete diaphragm walls have the same advantages but are less flexible in terms of design. The units are installed in a trench filled with a special mixture of bentonite and cement with a retarder added to control the setting time. Ground anchors are used to tie the panels or posts to the retained earth to provide stability.		Precast concrete diaphragm walls have the same advantages but are less flexible in terms of design. The units are installed in a trench filled with a special mixture of bentonite and cement with a retarder added to control the setting time. Ground anchors are used to tie the panels or posts to the retained earth to provide stability.
Line 28:		Line 28:
	* Rainscreen.		* Rainscreen.
	* Retaining walls.		* Retaining walls.
		+	* Secant pile wall.
	* Sheet piles.		* Sheet piles.
	* Substructure.		* Substructure.

Editor at 14:44, 30 January 2017

2017-01-30T14:44:52Z

← Older revision		Revision as of 14:44, 30 January 2017
Line 24:		Line 24:
	* Ground anchor.		* Ground anchor.
	* Groundworks.		* Groundworks.
		+	* Metal profile cladding.
	* Partition wall.		* Partition wall.
	* Rainscreen.		* Rainscreen.

Designing Buildings at 11:16, 2 November 2016

2016-11-02T11:16:09Z

← Older revision		Revision as of 11:16, 2 November 2016
Line 25:		Line 25:
	* Groundworks.		* Groundworks.
	* Partition wall.		* Partition wall.
		+	* Rainscreen.
	* Retaining walls.		* Retaining walls.
	* Sheet piles.		* Sheet piles.

Editor at 12:12, 19 October 2016

2016-10-19T12:12:28Z

← Older revision		Revision as of 12:12, 19 October 2016
Line 19:		Line 19:
	* Basement excavation.		* Basement excavation.
	* Building foundations.		* Building foundations.
		+	* Crosswall construction.
	* Curtain wall.		* Curtain wall.
	* Excavating plant.		* Excavating plant.

Editor at 12:47, 12 October 2016

2016-10-12T12:47:02Z

← Older revision		Revision as of 12:47, 12 October 2016
Line 1:		Line 1:
−	[[File:Diaphragmwall1.jpg]]	+	[[File:Diaphragmwall1.jpg\|link=File:Diaphragmwall1.jpg]]

	A diaphragm wall is a structural concrete wall constructed in a deep trench excavation, either cast in situ or using precast concrete components. Diaphragms walls are often used on congested sites, close to existing structures, where there is restricted headroom, or where the excavation is of a depth that would otherwise require the removal of much greater volumes of soil to provide stable battered slopes.		A diaphragm wall is a structural concrete wall constructed in a deep trench excavation, either cast in situ or using precast concrete components. Diaphragms walls are often used on congested sites, close to existing structures, where there is restricted headroom, or where the excavation is of a depth that would otherwise require the removal of much greater volumes of soil to provide stable battered slopes.
Line 25:		Line 25:
	* Partition wall.		* Partition wall.
	* Retaining walls.		* Retaining walls.
		+	* Sheet piles.
	* Substructure.		* Substructure.
	* Trombe wall.		* Trombe wall.