Temporary Installed Gondolas
Temporary installed gondolas are temporarily installed on a building or structure for carrying out of a specific task. It consists of a platform and a suspension rig which are assembled prior to use on a work site. They are dismantled and removed from site on completion of the work.
It is usually used by operators for external walls repair, painting, maintenance and inspection works.
Temporary installed gondolas can be Counter-weight Suspended Beam, Fixed Davits or Parapet Clamp
COUNTER-WEIGHT SUSPENDED BEAM
It consists of counterweight to stabilize the gondolas. The loading allowed on the gondola will thus be determined by the counterweights used.
FIXED DAVITS
Fixed davits can be mounted on the roof slab or parapet wall. The manner of mounting will determine the ease by which the cradle can be moved from one section to another to reach the different areas of the building’s façade. The davits can be rotated 180 degrees to launch it off the roof onto the facade.
PARAPET CLAMP
If a sufficiently solid and strong parapet (reinforced concrete or steel) is available, the parapet clamp may be used. The stability of the clamp is provided by the parapet itself. The parapet will thus need to be certified to take the loading required.
Where parapet clamps are used, the transverse stresses that the parapet is capable of withstanding is generally as recommended in Table below.
|
Overhang A*
mm (ins) |
Parapet thickness B**
mm (ins) |
Weight
kg (lbs) |
Dimensions mm (ins)
|
Hoist WWL
kg (lbs) |
Max. support response in kg (lbs) normal operation
|
Final responses
in kg (lbs) |
||
|
Ra = Rb
|
Rc
|
Ra = Rb
|
Rc
|
|||||
|
525 – 625 (20.7 – 24.6)
|
210 – 390***
(8.27 – 15.4) 90 min.**** (3.5) |
50 (110)
|
1345 max. x 500
(53 max x 19.7) |
300
(660) 500 (1100) |
810 (1785)
1320 (2909) |
425
(937) 675 (1488) |
1890 (4166)
3120 (6876) |
950 (2094)
1550 (3416) |
| * adjustment by 50 mm (1.97 ins) steps; ** adjustment by 20 (0.79 ins), 30 (1.18 ins), 50 (1.97 ins), 70 (2.76 ins), 80 (3.15 ins) or 100 mm (3.94 ins); *** reinforced concrete parapet; **** steel parapet |
||||||||
Recommended transverse stresses that the parapet wall can withstand (Table 1).
Cases
Case 1
Case 2
Case 3
Case 4