02 - BTI - We know your business

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02
Types of failure
Overstraining of anchor points, incorrect assembly and
insufficient load-bearing capacity of underground may
result in failure of the dowel system.
Type of failure Cause
Break in anchor ground
g Load too high
g Insufficient strength of anchor
ground
g Too low setting depth
Gap of part
Load details
Various loads are indicated in this catalog:
A) Breaking values (mean value from single tests in
uncracked material). Reasons for failing could be:
Break in the anchor ground, pulling out or break of
the dowel, break of the screw. (Maximum load of the
dowel!)
B) recommended working loads. A safety value is
already calculated in by the manufacturer.
C) Permiss ble loads. These are working loads that
already contain an appropriate extra safety value.
These loads are contained in the approval notices of
the “Institut für Bautechnik, Berlin” and only apply
when the approval conditions are met.
To determine the working load, the break value is
divided by a safety extra value, e.g. for a steel dowel
with a breaking value of 40 kN:
Working load = breaking value = 40 kN =10 kN = 1000 kg
safety factor 4
As safety factor, we recommend:
Steel dowel ^ 4 Plastic dowel ^ 6
Heavy loads ^ 1000 kg
^ 10 kN
Medium loads 1000 kg . x 100 kg
10 kN . x 1 kN
Light loads % 100 kg
% 1 kN
1 kN = 1000 N = 100 kp = 100 kg
g Insufficient part dimensions
g Border and axle spacing not
observed
g Splay pressure too high
Pulling out the dowel
g Friction, adhesive or positive
locking fails due to excessive
load or incorrect assembly
Steel break
g Strength of dowel or screws
too low for supported load
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Symbols
Monitored
General building author ty
approval by the “Deutsche
Institut für Bautechnik
Berlin” (DIBt).
Recommended by
the “Verband der
Sachversicherer” (VdS)
for use in fixed water
extinguishing systems.
Checked with regard to
fire resistance up to a certain
time in minutes
(F 120 = 120 min).
Non-rusting stainless steel
model.
Particularly for outdoors.
Association of German
Electricians.
Important general instructions
– Do not place dowel in concrete before less than
7 days hardening time.
– Cut through steel concrete arming to
establish dowel drilling not permitted.
– Always observe the borehole depth and
diameter. Clean borehole thoroughly
Observe min. setting depth. Hollow materials,
light materials and boards only to be bored when
turning.
– Consider the clamping power when selecting the
dowel.
– Observe the stipulated torque acc. to the
approval.
– Observe screw length and diameter.
– Do not hammer screws into dowel
(Exception: nail plugs).
– BTI polyamide dowels in own production are
free of silicone and halogen. In case of fire, no
dangerous dioxin is formed.
a axle distance d B part thickness
a r distance to border b width of part
use approved dowels
Is stipulated when there is a danger to public safety
in case of failure as well as danger to life and limb
of others. Important application examples for use
of approved dowels are the anchoring of facade
substructures,
suspended ceilings, grounds and, with the additional
requirement of shock safety, the installation parts in
public shelters.
How can I find the right dowel and anchor?
Step How / Where
Material/ – Determine
underground site – Announce site
Determine job: – Data fixing part
– Load classes?
(100 kg = 1000 N) – Announce site
– Approval required?
(pull-/pressure zone?) – Details from arch tect
– stainless steel required?
– borehole in
fixing part?
– Fire-protection re-
requirements?
– Property of
assembly?
– Application -
regulations? ...
Select Survey of applications in
dowel types catalog (often you will find the
the most su table dowel type
selected here)
Note on catalog side in the
survey of applications
Exact dowel from Catalog page
measurement – dependent
on clamping strength,
board strength,
load class,
borehole dia. in
fixing part,
Determine pre-plug-/
plug-through assembly,
etc. –
Select
correct screw Diameter:
see appropriate catalog page
Length:
refer to chapter “Selection-
of dowel and screw”, often also
on the appropriate catalog page
During assembly Catalog page
observe the
technical specs
(drill dia., drill depth.. )
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