English - Version - Putzmeister Akademie

Safety manual
Concrete delivery and placing machines
2.5.3 Procedure in storms
Return the placing boom to the driving position in the event of
storms or bad weather.
– Placing booms with a vertical reach of 42 m or more may only be
operated in wind forces up to 7 (wind speed 61 km/h = 17 m/s).
– Placing booms with a vertical reach of less than 42 m may only
be operated in wind forces up to 8 (wind
speed 74 km/h = 20 m/s).
Wind speeds in accordance with the Beaufort scale are average
wind speeds measured over a period of 10 minutes. Higher speed
gusts of wind may occur briefly during the measuring period.
Higher wind speeds jeopardize stability and safety of the structural
elements. There is a risk of lightning strike in a thunderstorm.
A lightning strike poses a lethal danger to persons. The machine
and the surrounding area will be charged with electricity. Earthing
the machine does not reduce this risk. For this reason, you should
fold in the placing boom if there is a risk of lightning strike.
Tower cranes on construction sites generally have wind speed
measuring equipment, so that you can ask about the wind speed at
any time. If no wind speed measuring equipment is available, you
can ask the nearest meteorological office what the wind speed is,
or estimate the wind speed using the following rule of thumb.
– In winds of force 7 and greater, green leaves break from the
trees and there is perceptible resistance when walking against
the wind.
– In winds of force 8 and greater, small branches break from trees
and walking outside is significantly impeded.
2.5.4 Concreting in
cold weather
The boom must not be used in temperatures below minus 15 _C
(+ 5 _F) unless the manufacturer has given express approval.
There is a danger of damage to the steel (brittle fracture) and the
seals throughout the system at such extreme minus temperatures.
In addition, such minus temperatures should be considered the
realistic lower limit for concrete placement, as it is no longer
possible to prepare concrete such that it can achieve its strength
without the use of special additives.
44 01/2011 Rev08 EN