Page 20 - ASF Katalog 2018 en

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ANCHOR CONNECTION ELEMENTS

Anchor components
For practical reasons, anchor bars should not be smaller than M39. It has proved worthwhile to form the threaded section by
upsetting in order to prevent weakening this zone. The permissible stresses in the core of the threaded zone and thinner anchor
shaft are therefore exploited to the full.

It is not necessary to form the threaded section by upsetting when Fully killed steel grades to DIN EN 10025 should be chosen because
forming a rolled thread because rolling results in an outside thread these are not susceptible to ageing, brittle failure or stress corrosion
diameter that is greater than the shaft diameter. Compared with an cracking. Steel grades S 235 JR and S 355 J2 +N should be preferred.
upset, machined thread, there are a number of advantages, e.g. higher The higher grade, S 355 J2 +N, is normally specified for economic and
strength and better accuracy of the profile, no interruptions to the safety reasons. The tables on pp. 10–15 provide an overview of the
fibres of the steel (dynamic loading capacity), see also EAU 2012. round steel tie rod sizes generally available.

And as longer threaded lengths are also possible, it is often Besides the usual round steel tie rods with threads at both ends,
unnecessary to include an additional turnbuckle. Loading tests on the anchors with upset eyes or T-heads can be selected for certain types of
Whitworth imperial thread still common these days have proved that connection.
this type of thread is the best one for rough building site conditions.
Metric threads can also be used. Round steel tie rods can be provided with turnbuckles when there
are no tensioning options at the ends (e.g. eye rods) or when it is
not possible to fabricate them in one piece. Round steel tie rods are
generally supplied in two pieces. The recommendation is to install the
turnbuckle just behind the main wall. The anchor wall can be supported
at an early date by backfilling with soil. In addition, good connection
options are then available for later conversion measures.

Anchor rod with hexagonal nuts

Eye rod

T-head rod

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