The utility of the high masts with mobile crown
in lighting large areas, is universally recognised.
It, in fact, represents the best answer either
from the lighting environmental, maintenance
point of view.
Lighting high masts with mobile crown
undertakes an irreplaceable part in designing
modern lighting plant of large areas, having the
approval of engineers who consider more and
more difficult to find personnel for carrying out
maintenance, disposed to climb to a certain
height.
Furthermore, the possibility of lighting large
areas (interchanges, parking areas etc....) with
few lighting sources of considerable height,
without particular maintenance costs, makes
the high masts with mobile crown particularly
profitable in the economy of the whole plant.
Our actual range, designed in standard elements
suitable to warrant the maximum safety
levels, is devised in several solutions
which can be enriched with decorative
personalised elements
Lighting masts with mobile crown mainly composed of:
Monotubular shaft tapered shaped with polygonal cross section, hot
dip galvanised, composed of 2 or more sections to be joined at site by
forced overlapping. Designed according to the methods
established from the construction theory in force. Manufactured by cold forming
of steel plate and subsequent external longitudinal welding carried out
by automatic and approved process. Provided for the anchorage to the
basement by means of direct burying into the concrete foundation block.
Movement system, complying with safety standard in force,
is composed of a mobile crown where the floodlights are fastened.
This crown, supported from 3 ropes transmitted on the trailing head on top
of the mast, slides along the shaft, allowing thus to lower the floodlights up
to an height suitable for the maintenance from the ground.
Movement, transmitted from the 3 ropes is carried out by means of electric
hoist applied to the base of the shaft. The hoist can be provided "trolley
mounted" or "inside the mast". During normal operation of the mast the
crown is fixed on top column thanks to the hooking elastic system with
double thin plate of armonic steel.
Electric system suitable for the power to be installed,
composed of the interlocked socket at the base of the shaft where
it is necessary to have the electric line, from the feeding cable self bearing
type, completed with CEE plug at one end, and then connected to the
junction box on the mobile crown on the other end. The junction box,
completed with terminal board already wired is provided with watertight
socket provided for the lighting test at ground
by means of purpose made extention with CEE plugs.
Movement system::.. Movement of the mobile crown is carried out, when it is necessary, by
means of an electric hoist, fixed at the base of the mast,
and put into service from the operator, from a safety distance,
by means of a push button with a low tension.
The electric hoist, connected and fed by the interlocked socket nearby the
door, transmits the movement to the chain of the hoist and then
to the hoisting ropes of the mobile crown, allowing thus the-lifting-lowering
of the floodlights located on the crown.
The hoist is provided with brake which enters into service in case
of lack of power during movement, stopping immediately the hoist
and arresting thus the lowering of the mobile crown.
The hoist can be supplied detached and trolley mounted to be fixed
to the base of the mast when necessary.
In this case You will need only one hoist for the movement of several mast
having same performances.
As alternative the hoist can be fixed inside the mast.
This solution is particularly indicated in case of only one mast or when
the installation site is difficult to reach with the trolley mounted unit..
Upon request our masts can be enriched with the supply of a dome cover which grants the protection of the head mast-crown-floodlights assembling.
This dome cover is made of fibre glass reinforced polyester plastic resistant to chemical and atmospheric agents.
On the upper external surface the dome is treated with a perfectly smooth finishing and normally coloured RAL 7032 ( or other colours upon request).
Standard dome covers, approximate diameter 3 m and 4 m, are composed of 3 gores and have been designed for installation of asymetric floodlights of the most famous brands, located on 360°.
In the case of floodlights with particularly shaped it is good to ask verification to our technical department.
CARRIAGE CAPACITY ::..
Floodlights on 180° and 360°::.. Determining of the expose windage are on top
Only as information we hereby mention some suggestions about
the criterion assumed to evaluate the loads applied on the high
mast with mobile crown.
In the evaluation we have examined the most frequently used
shapes, anyway different shapes but similar can be examined by
interpolation from the examined ones. For particular shapes we
recommend to ask to our technical department.
The total exposed windage area is given by the following formulas:
Stot = (As+Ac)xC.A. + (Ap+Aa)xC.A. where:
As = Trailing head not covered area
Ac = Mobile crown windage exposed area
Ap =Floodlights exposed area
Aa =ballasts / boxes not covered area
C.A. = Amplification factor
This criterion is considered a good approximation for all locations: only one side (from 0° to 180°) or from 180° to 360°, since it is based on the front shape of the whole on the top of the mast.
For shape we mean the projection on the vertical plane, orthogonal to the
wind direction, of the above mentioned whole. Therefore if the orientation
required allows it, some elements such as trailing head, or box or ballasts
or ignitors, can be covered from the respective floodlights.
You have to assume the data (exposed area, shape coefficient, weight)
given by the floodlights Manufacturer itself.
If specifics data are not available, the following will be applied:
Lighting masts with mobile crown mainly composed of:
Movement of the mobile crown is carried out, when it is necessary, by
means of an electric hoist, fixed at the base of the mast,
and put into service from the operator, from a safety distance,
by means of a push button with a low tension.
The electric hoist, connected and fed by the interlocked socket nearby the
door, transmits the movement to the chain of the hoist and then
to the hoisting ropes of the mobile crown, allowing thus the-lifting-lowering
of the floodlights located on the crown.
Upon request our masts can be enriched with the supply of a dome cover which grants the protection of the head mast-crown-floodlights assembling. 
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