Pile integrity test - Revision history

Designing Buildings at 07:13, 18 November 2020

2020-11-18T07:13:45Z

← Older revision		Revision as of 07:13, 18 November 2020
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	* Testing pile foundations.		* Testing pile foundations.

−	[[Category:~~Health_and_safety_/_CDM~~]] [[Category:~~Standards_~~/~~_measurements~~]] [[Category:~~DCN_Standard~~]] [[Category:Construction_techniques]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Health_and_safety_/_CDM]] [[Category:Standards_/_measurements]] [[Category:Construction_techniques]]

Designing Buildings at 15:58, 27 May 2018

2018-05-27T15:58:50Z

← Older revision		Revision as of 15:58, 27 May 2018
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		+	Foundations provide support for structures, transferring their load to layers of soil or rock that have sufficient bearing capacity and suitable settlement characteristics to support them.
		+
	Pile foundations are deep foundations. They are formed by long, slender, columnar elements typically made from steel or reinforced concrete, or sometimes timber. A foundation is described as 'piled' when its depth is more than three times its breadth.		Pile foundations are deep foundations. They are formed by long, slender, columnar elements typically made from steel or reinforced concrete, or sometimes timber. A foundation is described as 'piled' when its depth is more than three times its breadth.

−	While the integrity of superstructure members can be tested and assessed from visual examinations, dimensions checks and so on, pile foundations, once they are in place, ~~must~~ be ~~tested using a different method~~.	+	While the integrity of superstructure members can be tested and assessed from visual examinations, dimensions checks and so on, pile foundations, once they are in place, can be more difficult to test. Flaws and defects may develop during construction or subsequent excavation and trimming.

−	~~Flaws and defects can occur in all types of piles, and usually develop during construction or subsequent excavation and trimming.~~ Pile integrity testing ~~is a method that~~ is used to discover and assess ~~these~~ flaws before further damage occurs. It is a low-strain, non-destructive method and can be used to test any form of concrete or timber pile, as long as they are not excessively slender~~, as well as drilled shafts~~. ~~A pile integrity test~~ can be used either for forensic examinations on existing piles or for quality assurance for new construction.	+	Pile integrity testing is used to discover and assess flaws before further damage occurs. It is a low-strain, non-destructive method and can be used to test any form of concrete or timber pile as well as drilled shafts, as long as they are not excessively slender. It can be used either for forensic examinations on existing piles or for quality assurance for new construction.

	Various techniques can be used for interpreting the records of force and velocity taken under the impact of a light hammer blow. The most common technique is known as the transient dynamic response (TDR) method, which is both quick and cost-effective. Based on wave propagation theory, the top of a pile is struck with a hand-held hammer to generate a compression wave. This wave travels at a constant speed down the length of the pile and is measured with an accelerometer or geophone placed on top of the pile.		Various techniques can be used for interpreting the records of force and velocity taken under the impact of a light hammer blow. The most common technique is known as the transient dynamic response (TDR) method, which is both quick and cost-effective. Based on wave propagation theory, the top of a pile is struck with a hand-held hammer to generate a compression wave. This wave travels at a constant speed down the length of the pile and is measured with an accelerometer or geophone placed on top of the pile.

−	Any abnormalities or changes in cross-sectional area (e.g. due to the presence of a void) produce wave reflections which can ~~then~~ be measured and mapped on a digitally simulated profile of the pile.	+	Any abnormalities or changes in cross-sectional area (e.g. due to the presence of a void) produce wave reflections which can be measured and mapped on a digitally-simulated profile of the pile.

−	While pile integrity testing can provide an indication as to the soundness of the ~~concrete~~, it does have some limitations. It cannot be used over pile caps and does not provide an indication of the pile’s bearing capacity. ~~The~~ test is ~~also~~ not effective at evaluating the section of a pile below cracks that may cross the entire cross-sectional area of the pile.	+	While pile integrity testing can provide an indication as to the soundness of the pile, it does have some limitations. It cannot be used over pile caps and does not provide an indication of the pile’s bearing capacity. In addition, the test is not effective at evaluating the section of a pile below cracks that may cross the entire cross-sectional area of the pile.

	= Find out more =		= Find out more =
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	* Testing pile foundations.		* Testing pile foundations.

−	[[Category:Health_and_safety_/_CDM]] [[Category:Standards_/_measurements]] [[Category:Construction_techniques]]	+	[[Category:Health_and_safety_/_CDM]] [[Category:Standards_/_measurements]] [[Category:DCN_Standard]] [[Category:Construction_techniques]]

Editor: Created page with "Pile foundations are deep foundations. They are formed by long, slender, columnar elements typically made from steel or reinforced concrete, or sometimes timber. A foundation is ..."

2018-05-03T12:18:22Z

Created page with "Pile foundations are deep foundations. They are formed by long, slender, columnar elements typically made from steel or reinforced concrete, or sometimes timber. A foundation is ..."

New page

Pile foundations are deep foundations. They are formed by long, slender, columnar elements typically made from steel or reinforced concrete, or sometimes timber. A foundation is described as 'piled' when its depth is more than three times its breadth.

While the integrity of superstructure members can be tested and assessed from visual examinations, dimensions checks and so on, pile foundations, once they are in place, must be tested using a different method.

Flaws and defects can occur in all types of piles, and usually develop during construction or subsequent excavation and trimming. Pile integrity testing is a method that is used to discover and assess these flaws before further damage occurs. It is a low-strain, non-destructive method and can be used to test any form of concrete or timber pile, as long as they are not excessively slender, as well as drilled shafts. A pile integrity test can be used either for forensic examinations on existing piles or for quality assurance for new construction.

Various techniques can be used for interpreting the records of force and velocity taken under the impact of a light hammer blow. The most common technique is known as the transient dynamic response (TDR) method, which is both quick and cost-effective. Based on wave propagation theory, the top of a pile is struck with a hand-held hammer to generate a compression wave. This wave travels at a constant speed down the length of the pile and is measured with an accelerometer or geophone placed on top of the pile.

Any abnormalities or changes in cross-sectional area (e.g. due to the presence of a void) produce wave reflections which can then be measured and mapped on a digitally simulated profile of the pile.

While pile integrity testing can provide an indication as to the soundness of the concrete, it does have some limitations. It cannot be used over pile caps and does not provide an indication of the pile’s bearing capacity. The test is also not effective at evaluating the section of a pile below cracks that may cross the entire cross-sectional area of the pile.

= Find out more =

=== Related articles on Designing Buildings Wiki ===

* Bearing capacity.
* Bored piles.
* Driven piles.
* Geophysical survey.
* Insitu testing of soils.
* Pile foundations.
* Piling equipment.
* Structural engineer.
* Testing construction materials.
* Testing pile foundations.

[[Category:Health_and_safety_/_CDM]] [[Category:Standards_/_measurements]] [[Category:Construction_techniques]]