User Information
Dokaflex
30
tec
Structural design
15
999803902 - 06/2014
Optimising the structural design with regard to equipment
quantities
Instructions on how to use Tables 1 and 2 (on fol-
lowing pages) correctly:
▪
In Table 1:
- with reference to the required supporting height,
find out from this Table which types of floor prop
are suitable, and what their
max. permitted
prop load
is.
▪
In Table 2:
- find the
max. permitted spacing of the primary
beams
with reference to the slab thickness and
the chosen spacing of the secondary beams (will
depend upon the type of formwork sheet being
used).
- with reference to the selected permitted prop
load and spacing of primary beams, find out from
this Table the
max. permitted spacing of the
props
.
Example: Slab thickness 30
cm
1. Selected spacing of secondary beams: 0.50
m
(e.g. because of the type of formwork sheet)
2. Permitted spacing of primary beams: 2.62
m
➔
Value chosen: 2.50
m
3. For a permitted prop load of 25 kN:
max. spacing of props 1.09
m
➔
Value chosen: 1.00
m
4. For a permitted prop load of 35
kN:
max. spacing of props 1.53
m
➔
Value chosen: 1.50
m
Practical examples
Spacing of props a = 1.00
m
1)
1)
System grid 1-2-5 (markings on beams) for beam lengths of 4.90m
and 3.90m
Spacing of props a = 1.25
m
Spacing of props a = 1.50
m
2)
2)
System grid 1-3-5 (markings on beams) for beam lengths of 5.35m
and 3.90m
Spacing of props a = 1.75
m
Primary beams (Doka beams I
tec
20):
▪
Permitted bending moment: 9
kNm
▪
Permitted shear force: 20
kN
▪
Rigidity: 640
kNm
2
Secondary beams (Doka beams H20 top:):
▪
Permitted bending moment: 5
kNm
▪
Permitted shear force: 11
kN
▪
Rigidity: 450
kNm
2
To make work easier, on Dokaflex
30
tec it is
also possible to use the spacing marks on the
beams (in a 50
cm
grid).
A
"Main prop" (floor prop + Lowering head H20 + removable fold-
ing tripod)
B
"Intermediate prop" (floor prop + Supporting head H20)
C
Doka beam I tec 20 3.90m
D
Doka beam I tec 20 4.90m
E
Doka beam I tec 20 5.35m
98036-215-01
A
a
a
B
C
D
A
B
98039-203-01
A
a
B
D
98036-215-01
a
a
C
E
A
B
A
B
98039-203-02
A
a
B
D