ASSEMBLY PRINCIPLES
WHEN BUILDING A BOSS TOWER:
To comply with the Work at Height
Regulations, we show procedures with
additional platforms and the locating of
Guardrails when building in advance of
climbing onto a platform to reduce the risk of
a fall. This involves moving components, but
is an important procedure for your safety.
Always stand on a Boss Platform, never on the
rungs of a Frame.
All platforms feature double Guardrails on
both faces of either individual platforms or
fully decked levels.
Install Guardrails prior to climbing onto the
platform, from the protected position within
the trapdoor. Working platforms and rest
platforms (every 4 metres) must have
Guardrails installed 0.5 m and 1.0 m (1 and 2
rungs above the platform in ALL cases. All
working levels require toeboards.
DISMANTLING PRINCIPLES
TO DISMANTLE A BOSS TOWER:
Remove toeboards, and pass down the tower.
1450 TOWER
Unclip farthest end of braces and immediately
go to protected Trapdoor position on ladder
to complete removal.
Platforms used whilst dismantling should be
Double-Guardrailed on both faces.
Remove upper platforms from protected platform
levels below.
Pass removed components out of the Tower to a
colleague.
850 TOWER
Follow same procedure.
GENERAL NOTE
The assembly procedure should be
based on:
Always stand on a BOSS
platform, never on the rungs of
a frame.
Install platforms at 2 metre
vertical intervals, to give a
manageable reach height.
Locate double Guardrails
(Horizontal Braces) in advance of
climbing onto any platform.
Working Platforms require
Toeboards.
Always position Trapdoors over
Ladder side, and Fixed Platforms
on opposite side.
Unlocked
Locked
= Fixed Deck
= Trapdoor Deck
2
Clip Horizontal Brace (Red) onto
the vertical of the Span Frame,
facing claws outwards.
Frame will now be self-supporting.
Locking claws should be primed
before use, and released for
dismantling or relocation.
3
Position the Ladder Frame as
shown.
Clip the other end of the Horizontal
Brace onto the Ladder Frame. Fit
another Horizontal Brace (Red) onto the
lowest horizontal rung of the Frames to
square the tower.
5
Add Stabilisers.
See note on Stabilisers.
6
Fit a Fixed Deck on the lowest rung.
Fit a Trapdoor Deck on the 4th Rung
(2.0 m) with the Trapdoor next to
the Ladder.
Climb Ladder, and from a protected
Trapdoor position, fit the Guardrails on 5th
and 6th Rungs, in that order, on both
sides of the Platform.
7
Fit the next pair of Diagonal
Braces in opposing directions
between the 3rd and 5th Rungs.
Fit an additional Span Frame and
Ladder Frame. Ensure the Interlock
Clips are engaged.
8
Fit the next pair of Diagonal
Braces between the 5th and 7th
Rungs.
9
If finishing at this height (4.2 m
Platform), the Fixed Deck should
first be repositioned to the 8th
Rung of the Tower. Fit a
Trapdoor alongside it, with the
Trapdoor next to the Ladder.
10
Climb the Ladder and, from a
protected Trapdoor position,
fix Guardrails on the 9th and
10th Rungs, in that order, on
both sides of the Tower. Add
a Diagonal Brace between the
7th and 9th Rung.
11
When building beyond a 4.2 m
platform height Tower -
Continue to add Span and
Ladder Frames, Diagonal
Braces and Trapdoor Platforms
as shown in the previous steps.
Locked
1450 ASSEMBLY
We recommend two persons are
used to build Boss Towers.
Always start building with the
smallest height frames at the base
of the tower:
’The procedure illustrated shows a tower
starting with a 2-Rung Frame’
1
Push Castor onto Adjustable
Leg. Insert Adjustable Leg /
Castor assemblies into Frame
and lock castors.
(Alternatively use static Base Plates).
Tower Platform Height in Metres
Frame of
Base
2.2 4.2 6.2 8.2 10.2
2 Rung
3.2 5.2 7.2 9.2
4 Rung
4
Fit an additional Ladder Frame
and Span Frame. Ensure the
Interlock Clips are engaged.
Fit 2 Diagonal Braces (Blue) in
opposing directions, between the 1st
and 3rd rungs. Ensure the Frames are
vertical and level by checking with a
spirit level and setting the Adjustable
Legs as required.
Locked
Unlocked
INTERLOCK CLIP
12
Fit the Toeboards (see instructions
‘Fitting Toeboards’)
The Tower is now complete.
Locked
Unlocked
INTERLOCK CLIP
Locked
3
Position the Ladder Frame as
shown.
Clip the other end of the Horizontal
Brace (Red) onto the Ladder Frame. Fit
another Horizontal Brace onto the
lowest horizontal rung of the Frames to
square the tower. Ensure the Frames
are vertical and level by checking with
a spirit level and setting the
Adjustable Legs as required.
5
Fit 2 Diagonal Braces (Blue) in
opposing directions between
the 1st and 3rd Rungs.
Fit an additional Ladder Frame and
Span Frame. Ensure the Frame
Interlock Clips are engaged.
6
Add Stabilisers.
See note on Stabilisers.
7
Fit 4 Diagonal Braces (Blue) in
opposing directions between
the 3rd and 5th Rungs and the
5th and 7th Rungs.
Locate a Trapdoor Deck on the 6th
Rung with the Trapdoor next to the
Ladder.
8
Climb the Ladder and from the
protected position of the
Trapdoor, fit Guardrails to the
7th and 8th Rungs (in that
order), on both sides of the
Tower.
9
When building beyond a 3.2 m
platform height Tower -
Continue to add Span and
Ladder Frames, Diagonal Braces
and Trapdoor Platforms as
shown in the previous steps.
Always add Horizontal
Guardrails from the protected
position within the Trapdoor.
10
Fit the Toeboards (see
instructions ‘Fitting Toeboards’)
The Tower is now complete.
850 ASSEMBLY
We recommend two persons are
used to build Boss Towers.
Always start building with the
smallest height frames at the base
of the tower:
’The procedure illustrated shows a tower
starting with a 4-Rung Frame’
1
Push Castor onto Adjustable
Leg. Insert Adjustable Leg /
Castor assemblies into Frame
and lock castors.
(Alternatively use static Base Plates).
Tower Platform Height in Metres
Frame of
Base
2.2 4.2 6.2 8.2 10.2
2 Rung
3.2 5.2 7.2 9.2
4 Rung
4
Fix a deck on the 2nd Rung
with the Trapdoor next to the
Ladder.
Fix Guardrails on the 3rd and 4th
Rungs on both sides of the Tower.
2
Clip Horizontal Brace (Red) onto
the vertical of the Span Frame,
facing claws outwards.
Frame will now be self-supporting.
Locking claws should be primed
before use, and released for
dismantling or relocation.
Locked
TIES
Ties should be used when the
tower goes beyond its safe height
- beyond the limits of the
stabilisers/outriggers or where
there is a danger of instability.
They should be rigid, two way ties
fastened to both uprights of the
frame with load-bearing right
angled or swivel couplers. Only
couplers suitable for the 50.8 mm
diameter tube of the tower should
be used. Ideally ties should secure
to either face of a solid structure or
by means of anchorages.
The tie frequency may vary
depending on the application, but
they should, at a minimum, be at
every 4 metres height.
ERECTION
Check that all components are on site and that they are functioning correctly – See Quantity Schedule.
Ensure the ground on which the mobile access tower is to be erected and moved, is capable of
supporting the tower.
The MAXIMUM Safe Working Load (the combined weight of the user/s, tools and materials) that may be
placed on the Tower is the Total Weight less the Self Weight of the Tower.
EXAMPLE
A 1.45 m x 2.5 m Tower with a Platform Height of 4.2 m has a Self Weight of 201 kg.
950 kg
201 kg
TOTAL WEIGHT
-
SELF WEIGHT = 749 kg MAXIMUM Safe Working Load
The MAXIMUM Safe Working Load that may be placed on ANY Working Platform is 275 kg - This must be
evenly distributed over either one Trapdoor Platform (850), or a Fixed Platform and Trapdoor Platform (1450)
placed side by side.
Towers must always be climbed from the inside during assembly and using the built-in ladder provided
during use.
Adjustable Legs should only be used for levelling.
Do not use boxes or step ladders on the platform to gain additional height.
LIFTING OF EQUIPMENT
Tower components should be firmly secured by a reliable lifting material (eg rope), employing a reliable
Knot (eg clove hitch), to ensure safe fastening.
MOVEMENT
GENERAL NOTES
TIES
USAGE ADVICE
The tower should only be moved by manual effort, and only from the base.
When moving the tower, beware of live electrical apparatus, particularly overhead, plus wires or
moving parts of machinery.
No personnel or materials should be on the tower during movement.
Caution should be exercised when wheeling a tower over rough, uneven or sloping ground, taking care
to unlock and lock castors. If stabilisers are fitted, they should only be lifted sufficiently above the
ground to clear ground obstructions. The height of the tower, when being moved, should not exceed
2.5 times the minimum base dimensions, or 6 metres overall height.
MAINTENANCE
All components and their parts should be regularly inspected to identify damage, particularly to welds. Lost or
broken parts should be replaced, and any tubing with indentations greater than 5mm should be put to one
side for manufacturer repair. Adjustable leg threads should be cleaned and lightly lubricated to keep them free
running.
DURING USE
Beware of high winds in exposed, gusty or medium breeze conditions. We recommend that in wind
speeds over 7.7 metres per second (17 m.p.h.), cease working on the tower. If the wind becomes a
strong breeze, expected to reach 11.3 metres per second (25 m.p.h.), tie the tower to a rigid structure.
If the wind is likely to reach gale force, over 18 metres per second (40 m.p.h.), the tower should be
dismantled.
Wind
Beaufort
Beaufort
Speed in
Speed in
Description
Scale
No.
m.p.h.
m/sec.
Medium Breeze
Raises dust and loose
4
8-12
4-6
paper, twigs snap off.
Strong Breeze
Large branches in motion,
6
25-31
11-14
telegraph wires whistle.
Gale Force
Walking is difficult.
8
39-46
17-21
Beware of open ended buildings which can cause funneling effect..
Do not abuse equipment. Damaged or incorrect components should never be used.
Raising and lowering components, tools, and/or materials by rope should be conducted within the tower base.
Ensure that the safe working load of the supporting decks and the tower structure is
not exceeded.
The assembled tower is a working platform and should not be used as a means of access to other structures.
Beware of horizontal forces (eg power tools) which could generate instability. Maximum horizontal force 20
kg.
The stairway towers featuring an inclined staircase access are for use with personnel frequently carrying tools
and/or materials.
Mobile towers are not designed to be suspended - please refer to your supplier.
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