The plumbing accessories ensure that the formwork remains stable against wind loads, and make it easier to plumb and align the formwork.
|
|
NOTICE The formwork gangs must be securely braced in every phase of the construction work! Observe all applicable safety rules! |
|
|
For more information (wind loads etc.) see the section headed 'Vertical and horizontal loads' in the Calculation Guide 'Doka formwork engineering'. |
|
|
CAUTION There is a risk of the formwork tipping over in high winds. ➤ If high wind speeds are likely, and when work finishes for the day or before prolonged work-breaks, always take extra precautions to fix the formwork in place. Suitable precautions: |
|
The rule-of-thumb here is: |
|---|
|
The length of the struts or pipe-braces should be the same as the height of the panel to be supported. |
Note:
Every gang-form must be supported by at least 2 plumbing accessories.
Max. influence widths of the struts or pipe-braces:
|
Formwork height |
Plumbing strut / Prop / |
Max. influence width |
|
|---|---|---|---|
|
10 psf |
15 psf |
||
|
6’-0" (1.83 m) |
260 |
9’-0" (2.75 m) |
6’-0" (1.83 m) |
|
9’-0" (2.75 m) |
260 |
9’-0" (2.75 m) |
6’-0" (1.83 m) |
|
12’-0" (3.66 m) |
340 |
12’-0" (3.65 m) |
9’-0" (2.75 m) |
|
15’-0" (4.57 m) |
540 1) |
15’-0" (4.55 m) |
10’-0" (3.05 m) |
|
18’-0" (5.48 m) |
540 1) |
10’-6" (3.20 m) |
6’-9" (2.05 m) |
|
21’-0" (6.40 m) |
340 + |
12’-0" (3.65 m) |
9’-0" (2.75 m) |
|
22'-0"-40'-0" 2) |
12’-0" (3.65 m) |
9’-0" (2.75 m) |
|
|
22’-0" (6.70 m) |
340 + |
12’-0" (3.65 m) |
9’-0" (2.75 m) |
|
22'-0"-40'-0" 2) |
12’-0" (3.65 m) |
9’-0" (2.75 m) |
|
|
24’-0" (7.31 m) |
340 + |
10’-6" (3.20 m) |
6’-9" (2.05 m) |
|
22'-0"-40'-0" 2) |
12’-0" (3.65 m) |
9’-0" (2.75 m) |
|
|
27’-0" (8.23 m) |
540 1) + |
12’-0" (3.65 m) |
9’-0" (2.75 m) |
|
22'-0"-40'-0" 2) |
12’-0" (3.65 m) |
9’-0" (2.75 m) |
|
|
Max. anchoring load: 3 kip (13.5 kN) |
|||
1) or Pipe brace 12’-0"-21’-0"
2) or Eurex 60 550
Values apply to all panel struts in conjunction with the Frami S bracing head or the Frami S connection profile.
These values apply up to wind-pressures of 10 psf (0.48 kN/m2) or 15 psf (0.72 kN/m2) respectively. The greater wind loads encountered at exposed formwork-ends must be constructionally sustained by additional plumbing accessories (e.g. struts or pipe-braces).
The number of struts must be determined separately for:
- wind pressure above 15 psf (0.72 kN/m2)
- formwork higher than 27’-0" (8.23 m)
Sample calculation:
▪ Formwork height: 27’-0" (8.23 m)
▪ Width of gang-form: 21’-0" (6.40 m)
▪ Wind pressure: 10 psf (0.48 kN/m2)
Result:
▪ 2 Struts 540
(or 2 pipe braces 12'-0"-21'-0")
and
▪ 2 pipe braces 22'-0"-40'-0"
(or 2 Eurex 60 550)
.