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New grouted anchor standard set to be published next month

UK standards organization BSI has confirmed that a long-awaited standard for testing of grouted anchors is set to be published in August marking the end of a development project that has spanned more than a decade.

Publication of the new EN ISO 22477-5 standard for testing of grouted anchors and the revised code of practice for grouted anchors (BS8081: 2015:A2:2018) will unify testing methods into three standardised approaches.

The standard has been unanimously approved by the members of the technical committees ISO/TC 182 and CEN/TC 341, which is a significant achievement according to convener Devon Mothersille, who is managing director of Geoserve Global.

grouted anchor testing us

grouted anchor testing us

The standard will unify testing methods

“Millions of grouted anchors have been used all over the world and it is a mandatory requirement that each one is tested before it is brought into service to prove it is fit for purpose,” said Mothersille. “Historically, each country has used different methods to undertake this testing and the standard will unify the techniques in one document.”

Gaining consensus from all countries has been very complicated, according to Mothersile, and a number of nations threatened to veto the standard, which is why the project has taken so long to reach the point of publication.

“There is no problem with the previous methods and the standard is not being developed because tested anchors have failed,” explained Mothersille. “Our approach in the UK was based on work undertaken by Stuart Littlejohn in the 1960s but Germany and France each have a different philosophy and each of these approaches are polarised from each other.

“The new standard does not present one method but describes each method.”

According to Mothersille, this harmonisation will allow contractors to bid for work outside of their home country.

“Although testing in the UK is strong and performed well, the new standard will bring some changes to UK practice,” said Mothersille. “As convenor, I had to be careful not to impose my own ideas on the standard and we had to also ask member countries to be prepared to adjust their practices.

“Traditionally the UK has used Test Method 2, which was originally split into two parts giving the user the option to use creep displacement of the anchor or load loss as the means of assessing behaviour. This was judged to be confusing by our European counterparts and the new standard was amended so that Test Method 2 represents load loss only and Test Method 1 represents measurement of the creep rate of the anchor under load. So even though there is an option, UK engineers will probably resort to using the new Test Method 1 since it most closely relates to existing practice.”

 

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