Class 1 soils are difficult to probe consistently and the ASTM blow count may be of questionable value
** It is advisable to install anchors deep enough, by the use of extensions, to penetrate a Class 5 or 6, underlying the Class 7&8 soils.

The column ‘probe values’, refers to torques measured using the Soil test probe available from ABC. This kit enables a single operator to perform a practical test to help determine anchor configurations and performance.

In general standard anchors can be used in soils from Class 8 up to Class 4. Rock anchors will give excellent results in Class 1 & 2 soils. However when subjected to tension loads care must be taken to ensure adequate depth of soil over the highest helix.

It is essential that regular testing of installed anchors is used as a back up to torque monitoring. This is the only way to ensure that installers and specifiers maintain confidence in the system. ABC can supply test equipment for quality control and insist on its use by qualified installers.