7
PORTA
GANTRY
500-3000
Correct Operation
Deflection of the
PORTA
GANTRY can be
reduced (or limited) by increasing or down
rating its working load limit (WLL) by 50%.
Increasing the beam section can also help limit
deflection. Please contact REID for further
advice.
Another safe recommendation for moving the
load along the beam is to use a mechanical aid.
REID Lifting can supply you with our geared
Trolleys, rope control systems or shackled
cheek plates can be fitted [see page 22].
The rope control system is particularly useful
on longer beams or where the gantry is at
maximum height of lift.
Using a mechanical aid such as a geared trolley,
chain hoist in conjunction with shackled cheek
plates or rope control system for traversing the
load helps optimise the gantry capacity.
The Trolley Rope Control system has the added
advantage of enabling the operator to control
the movement of the trolley from a safe location
at the side of the gantry. The system includes
a winch and series of sheaves that produce a
mechanical advantage and reduce the effort
during operation.
For guidance we recommend the maximum
loads that can be safely moved with standard
trolleys without a mechanical aid (subject
to all other site conditions being taken into
consideration in a risk/hazard analysis) are:
A section beams up to 4570mm = <500kg or
50% capacity of the gantry whichever is lower
B section beams up to 5500mm = <500kg or
50% capacity of the gantry whichever is lower
D section beams up to 5500mm = <1000kg or
50% capacity of the gantry whichever is lower
D section beams up to 8400mm = <500kg or
50% capacity of gantry whichever is lower
To be able to effectively and safely move loads
above these limits the operator should use the
most appropriate mechanical aid. For further
advice, please contact REID Lifting or a qualified
or competent person.
Incorrect use of the gantry could lead to
accidents causing personal injury and/ or
damage to equipment and infrastructure.
Please ensure that the advice and guidelines in
this Assembly & Operation Guide are followed.
Standard Beam Length [mm]
WLL [kg]
2500
3000
3920
4570
5500
6000
8400
9000
500
A
0-5mm
A
0-5mm
A
5-10mm
A
10-15mm
A
20-30m
A
25-35mm
A
60-70mm
A
80-90mm
1000
A
5-10mm
A
5-10mm
A
15-20mm
A
20-30mm
A
42-52mm
A
45-55mm
B
110-120mm
B
125-140mm
2000
A
10-15mm
A
15-20mm
A
25-35mm
A
40-50mm
B
55-65mm
D
25-35mm
D
70-80mm
X
3000
A
15-20mm
A
20-25mm
B
35-45mm
B
60-70mm
D
30-40mm
D
40-50mm
D
100-110mm
X
5000
D
5-10mm
D
10-15mm
D
20-30mm
D
30-40mm
D
50-60mm
X
X
X
Approx Beam Deflection at Max Capacity [mm]
Moving under Load
When moving the gantry underload, the
following instructions MUST be followed:
This product can only be moved in the
direction perpendicular to the beam
Directional locks must be used on the castors
(perpendicular to the beam only)
The end user MUST make sure the center of
gravity of the load is known and the lifting
points are in such a way that the load is
EQUALLY distributed, so the load generates a
vertical pull to the beam.
The load is not allowed to swing
The floor must be smooth, flat, free from cracks
or steps and the weather conditions should be
safe for the operation (i.e. not when frost, ice or
snow present)
A risk assessment and method statement are
required to be completed by a competent
person before moving the gantry under load
The gantry’s movement must be controlled at
a slow speed, no sudden movements or high
speeds are allowed