Page 6 - ASF Katalog 2018 en

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ANCHORAGES

If the structural and constructional requirements placed on a The waling transfers the forces from the sheet pile wall to the
sheet pile wall call for an anchorage, then propping the walls anchor and at the same time helps to align and stiffen the wall.
against each other is one way of doing this, e.g. in trenches for The anchor transfers the support reaction of the sheet pile wall
installing buried services. via the waling to the anchorage itself.

However, in most cases the wall will have to be anchored back And the task of the anchorage is to transfer the forces from the
into the ground. Structural and constructional requirements main wall to the subsoil. When using round steel tie rods, the
dictate the choice and design of an anchorage. Critical for the anchorage is achieved with an anchor plate or anchor wall.
design is the support reaction A resulting from the structural When using anchor piles, e.g. driven steel piles, driven
calculations for the sheet pile wall and the analysis of the micropiles or grouted anchors, the force from the sheet pile
lower slip plane. wall is transferred to the subsoil via the skin friction of the pile.

Design of anchorage elements Trench shoring

Anchor wall, walings, capping beams and end plates
For predominantly constant loads, verification of structural safety
must be carried out according to DIN EN 1993-5. Higher partial safety
factors may need to be considered for walings and capping beams. In
the case of predominantly varying loads, it is necessary to verify the
fatigue strength to DIN 19704-1. EAU 2012, the Recommendations
of the Committee for Waterfront Structures, Harbours & Waterways,
should also be consulted.

Killed steels to DIN EN 10025 should generally be chosen.
Closetolerance bolts, grade 4.6 or higher, should be used at bolted
joints in walings and capping beams. Verification of fatigue strength Round steel tie rod
must be carried out in accordance with DIN EN 1993-5.

Round steel tie rods and waling bolts
Anchors are generally subjected to predominantly static loads.
Significant fluctuating loads occur in anchors in certain instances
only, but more frequently in waling bolts. Steels to DIN EN 10025
should be used for round steel tie rods and waling bolts. Steel grade
S 355 J2+N is normally selected. The anchor forces due to the loads
according to load case 2 should generally be used when designing for
predominantly static loads. Verification of structural safety should be
carried out to DIN EN 1993-5. The relevant reduction factors for load
cases 1 to 3 should be taken into account.
Driven grouted anchor pile
DIN EN 14199 applies for the design and construction of sheet pile
wall anchorages with grouted anchors. Only fully killed steels may be
used in situations with predominantly fluctuating loads. Verification of
structural safety should be carried out according to
DIN EN 1993-5. If the basic static load is equal to or less than the
amplitude of the reversed loading, the designer is recommended
to prestress the anchors, or waling bolts, to a value higher than the
amplitude of the stress in a controlled and permanent way.

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