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Best PracticeA Good Practice Guide for
® permanent foundation formwork systems
www.maxfrank.comEd
ition
Uni
ted
Kin
gdom
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® – Best Practice
Permanent formwork systems offer a time saving and cost
effective method of constructing reinforced concrete founda-
methods.
Introduction
The object of this guide is to ensure that…
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® – Best Practice
System components & concept
Reinforcement cover spacers
concrete pressure.
latent
-
-
Good Practice requires that…
…concrete wastage is avoided
Faster construction
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Common defects associated with some permanent formwork systems
during the pour
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Common defects associated with some permanent formwork systems
voids
-
act as a crack inducer
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Common defects associated with some permanent formwork systems
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Common defects associated with some permanent formwork systems
-
sed compressive strength and resist crushing
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® – Best Practice
Spacer load capacity / excavation depth limits
then ‘normal duty’
then ‘heavy duty’
Importance of suitable spacers:British Standard BS7973 & Concrete Society / NHBC guidance
-
-
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adjacent
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5.5 kN/m
25.5 kN
/m2
0,5m
1,0m
2,0m
3,0m
1,5m
2,5m
3,5m
4,0m0,5 kN0 kN 1,0 kN 1,5 kN 2,0 kN 2,5 kN 3,0 kN 3,5 kN
individual spacer load in kN(maximum lateral earth pressure/11 No./m2)
max.0,5 kN
max.3,0 kN
Sand
Ballast
Type 1 MOT
Topsoil
Stiff Clay
Graded stone
6F2
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® – Best Practice
formwork stiffness
excavation depth
-
inforcement.
-
-
-
max. 300 mm
max. 300 mm
Bridging the cover zone
around the excavation to avoid damaging spacers or shifting the reinforcement
cage out of position.
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® – Best Practice
Deep trenches
zip ties so not to encourage corrosion.
Heave protection void formers
Quality Management System-
guide as an aid.
-
-
QUALITY
ACT
CHECKDO
PLAN
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® – Best Practice
1.0 Reinforcement spacers NO
NO
-
NO
