MECHANICAL
ANCHORS > Ultraplus Undercut
Anchor
Undercut Anchor
Systems

The undercut anchor for exceptionally high
loads in cracked and non-cracked concrete – also for shock and earthquake loads.

Product
Description:
The ULTRAPLUS undercut anchor is designed
for use in applications where reliability and safety are essential, e.g. for anchoring safety relevant components
in nuclear power plants, for industrial plants, conveyor systems, cranes, and also for special civil engineering
solutions.
The ULTRAPLUS was developed to resist very
high loads with its unique undercutting technology. After the hole is drilled, a separate undercut is drilled using
the special undercutting tool. When the anchor is inserted through the fixture, spring pressure opens the expanding
segments. They lock into the undercut with a clearly audible click. The result is a mechanical interlock without
expansion stresses. By applying the specified torque, the fixture is fastened in position. The “positive undercut”
allows perfect bearing of the segments and ensures reliable transmission of the load into the
concrete.
Applications:
-
Steel construction
-
Conveyor systems
-
Industrial plants
-
Cranes
-
Nuclear power plants
Features:
-
Positive undercut anchor with
-
Expansion pressure free
strong mechanical interlock
-
Small edge distances and spacings
Immediately loadable
-
Completely removable
Through-fix installation
Benefits:
-
Dependable fixing for high loads in cracked and
non-cracked concrete
-
High safety margins due to positive
undercutting
-
High strength threaded rod – Grade
10.9
-
The spring automatically compensates for tolerances
in the fixture thickness
-
Reduced edge distances and
spacings
-
Custom lengths available
-
Proven performance history in resisting dynamic
loads, shock loads, and earthquakes. Expert reports available for these and other
applications.
-
Positive undercutting (comparable performance to a
cast-in headed stud)
Function:
When the anchor is installed the expansion
segments are driven down to the undercut in the drilled hole. The spring pressure automatically expands the
segments into the undercut with an audible “click.” This results in a mechanicalundercut connection without any
expansion pressure. The “positive undercut”allows perfect bearing of the segments and ensures reliable transmission
of the load into the concrete.
Material:
Grade 10.9 carbon steel, zinc plated and
blue passivated.
Base
Material:
Cracked and non-cracked concrete: C20/25 to C50/60
Approval:
ETA-04/0099 – Option 1 – Carbon steel, zinc plated.
Load Range:
Tension: Nperm = 19.0 - 320.2 [kN]
Shear: Vperm = 45.2 - 371.4 [kN]
Product
Range:
UP: M12 – M36, carbon steel, zinc plated and blue passivated.
Installation:

Carbon steel, zinc plated
ULTRAPLUS UP
Installation Accessories:

Carbon steel,
zinc plated:
Permissible loads for single anchors with no
infl uencing edge distances or spacings. Loads are calculated using partial safety factors from ETAG 001 and the
characteristic anchor and installation data.
Design calculations shall follow the
requirements of ETA-04/0099.


Installed Anchor:

-
The permissible loads have been calculated using
the partial safety factors for resistances stated in the ETA-approval and a partial safety factor for
actions of ²F = 1.4. The permissible loads are
valid for unreinforced concrete and reinforced concrete with a rebar
spacing s ≥ 15 cm and reinforced concrete with a rebar spacing s ≥ 10 cm if the rebar is 10 mm or
smaller.
-
The permissible shear loads are based on a single
anchor without infl uencing concrete edges. For shear loads applied close to an edge (c ≤ 10 hef or 60
d) concrete edge failure must be checked per ETAG 001, Annex C, design method A.
-
Concrete is considered non-cracked when the tensile
stress within the concrete is sL + sR £ 0. In the absence of detailed verifi cation sR = 3 N/mm² can be
assumed (sL equals the
tensile stress within the concrete as a result of external loads, forces
on anchors included).
-
If spacings or edge distances become smaller than
the characteristic values (i.e. s ≤ scr,N and/or c ≤ ccr,N) a calculation per ETAG 001, Annex C, design
method A must be performed.
-
The permissible bending moments are only valid for
the threaded stud (e.g. in case of a distance mounting).
-
This hmin only applies when the remote face of the
concrete is inspected to ensure there has been no break-through as a result of drilling. Otherwise hmin
= 360 mm (M16) and hmin = 400mm (M20).
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