52
fi
g. 3.11
fi
g. 3.12
3 - B
ਨਣਦਤਲ
Main frame side of
structure
Bearing bridge side
of structure
Inclinometer
Inclinometer
connection cable
Locking
pin
Locking
plate
Bridges
Cantilever
1-
Make sure that inclinometer options 1 and 2 are disabled on the screen.
2-
Using any appropriate lifting device such as a crane or a rough terrain forklift, bolt a
fi rst
bridge assembly to the
motorized unit
on one side of the mast. Refer to p. 50
of this section for instructions on the installation of a bridge. It is important to note that
bridge support brackets cannot be used to bolt a bridge assembly to the main frame
of the motorized unit.
3-
Bolt a second bridge assembly to the motorized unit, on the other side of the mast.
For subsequent bridges allowed to be installed, bridge support brackets may be used
to lift the bridge to be installed. For more information about the use of bridge installation
support brackets, refer to p. 110 of the Accessories section.
4-
Install as many additional bridges as required and allowed. It is important to install each
bridge alternately on one side, then on the other side of the mast, to avoid throwing the
structure out of balance.
The number of bridges must be equal on both sides of a
cantilever installation
. Refer to the
Load Capacities
section on p. 94 for information
on the number of bridges allowed in a cantilever confi guration.
Installation
Bearing Bridge
(requires the use of two motorized units and
two bearing bridge adapters – sold separately)
Safety guidelines
1-
In a bearing bridge setup (multiple units), it is
mandatory
to install any additional
cantilever
after
the bearing bridge structure has been installed to avoid throwing the
structure off balance. Dismantle all the components of the structure in reverse order.
2-
It is recommended that two persons handle all rise and descent operations of each
motorized unit and that at least
one
of those two persons is a
qualifi ed operator
. It
is important to coordinate the motion of motorized units linked by a bearing bridge to
keep the structure as level as possible. Refer to p. 7 of the
Performance and Safety
section for the defi nition of a qualifi ed operator.
3-
Daily verifi cation and testing of all the inclinometers must be performed before operating
the motorized units (as part of the daily inspection).
1-
Choose a clear, level surface close to the work area where the bridges can be
temporarily set down to assemble the bearing bridge structure. To facilitate assembly,
set down wood cribbing or mast sections laid horizontally before lowering the bridges
in place.
2-
Using a rough terrain forklift or a crane, lift and lower a bridge on top of the wood
cribbing or the laid down mast sections.
3-
Lift another bridge and align it carefully with the bridge it must be attached to.
4-
Assemble the two bridges as described in the instructions on p. 50 of this section.
5-
Complete the assembly of the bearing bridge structure using as many bridges as is
required and allowed. Refer to p. 96 of the
Load Capacities
section for information
on the number of bridges allowed in a bearing bridge confi guration.
Assembly of a bearing bridge structure
Installation of a twin mast adapter
1-
Lift and position the fi rst twin mast adapter so that the inclinometer is on the
bearing
side of the structure,
opposite
to the main frame (fi g. 3.11, p. 52).
