HSS Hire Mobile Aluminium Tower 1450 User manual

Instruction Manual - 508
Ladderspan 3T
Mobile Aluminium Tower
1450/850 Ladderspan
3T - Through the Trapdoor Method
Safety / Value /Availability /Support
hss.com /08457 28 28 28

BoSS Ladderspan 3T Instruction Manual

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Contents
1Safety First
1.1 Introduction 2
1. 2 Tower Designation 3
1. 3 Maintenance - storage - transport 3
2Building the Tower
2.1 Pre-Assembly Checks 4
2.2 Component Diagram 5
2.3 Quantity Schedule 6
2.4 Stabilisers 9
2.5 Assembly 10
2.5.1 Assembly for 1450 Towers 11
2.5.2 Assembly for 850 Towers 16
2.6 Dismantling 18
3 Using the Tower
3.1 Safety Checklist 19
3.2 Pre-Use Checklist 19
3.3 Use 20
3.4 Movement of the assembled prefabricated tower scaffold 21

2BoSS Ladderspan 3T Instruction Manual
1 Safety First
1.1 Introduction
Please read this instruction manual carefully.
THIS INSTRUCTION MANUAL SHALL BE AVAILABLE AT THE LOCATION OF USE
OF THIS MOBILE ACCESS TOWER.
THIS PRODUCT SHALL ONLY BE USED IN ACCORDANCE WITH THIS MANUAL.
FAILURE TO FOLLOW THESE INSTRUCTIONS MAY LEAD TO
DEATH OR SERIOUS INJURY.
IF ANY ASPECT OF THESE INSTRUCTIONS CONFLICTS WITH LOCAL
REGULATIONS PLEASE CONTACT WERNER UK SALES & DISTRIBUTION LTD.
FOR ADVICE.
Please note that diagrams are for illustrative purposes only.
Instruction manuals are also available to download at www.bossaccesstowers.com.
BoSS mobile aluminium towers are light-weight scaffold towers used throughout
the building and construction industry for both indoor and outdoor access solutions
where a stable and secure platform is required. Ideal for maintenance and installation
work or short-term access, the highly versatile towers provide a strong working
platform for a variety of heights.
Verication and assessment documentation is held by Werner UK Sales &
Distribution Ltd.
If you need further information, design advice, additional instruction manuals or any
other help with this product, please contact Werner UK Sales & Distribution Ltd.
on [phone] or email [e-mail].
Compliances
The BoSS Ladderspan mobile tower system has been
designed, tested, approved and certied to EN 1004-1:2020.
This instruction manual is in compliance with EN1298-IM-en.

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1 Safety First
1.2 Tower Designation
EN 1004 3 8/12 XXXD H2
Design Code
Load Class (2 = 153kg/m2UDL, 3 = 204kg/m2UDL)
Max. Platform Height Outdoors (m)
Max. Platform Height Indoors (m)
Access Method
A = Stairway, B = Stair ladder, C = Inclined Ladder, D = Vertical Ladder
Clear Height Class (H1 = 1.85m, H2 = 1.90m)
1.3 Maintenance - storage – transport
•The BoSS mobile tower system is robust and requires little maintenance.
•All components and their parts should be regularly inspected to identify
damage, particularly to joints.
•Refer to the BoSS Inspection Guidance for detailed inspection and
maintenance advice, the guidance is available to download at:
www.bossaccesstowers.com.
•Threads, hinges, and brace latches may be lubricated with light oil. Ensure oil
does not contaminate climbing or walking surfaces.
•Safety labels should be kept legible. Replacement labels are available from
Werner UK Sales & Distribution Ltd.
•Surfaces should be kept reasonably free of dried paint, plaster etc.
•Use of solvents on wooden platform surfaces and plastic components should
be avoided.
•Components should be stored in clean, dry conditions with due care to prevent
damage.
•During transportation ensure components are not damaged by excessive
strapping forces.

4BoSS Ladderspan 3T Instruction Manual
2 Building the Tower
2.1 Pre-Assembly Checks
•Check overhead that the area into which the structure is to be erected contains
no obstructions, particularly electrical or radio radiation hazards. The structure
is conductive.
•Ensure the ground on which the mobile access tower is to be erected is
capable of supporting the tower in use.
•Check the surface is level within the 210mm range of the adjustable legs.
•Adjustable legs should only be used for levelling purposes and never to gain
extra height.
•Ensure distance from the ground to rst climbing rung is less than 400mm.
•Only climb the tower from the inside using the access method provided.
•Tower scaffolds are not designed to be lifted or suspended.
•This tower provides a work platform. It must not be used to access other
structures.
•Ensure the safe working load on the structure is not exceeded.
•Tools and materials should be lifted using a reliable lifting material (e.g. a strong
rope) employing a reliable knot (e.g. clove hitch) to ensure safe fastening and
always lift within the footprint of the prefabricated tower scaffold (i.e. within the
area bounded by the stabilisers).
•Check this manual is available and its contents familiar to all those involved.
•If assembling outdoors; check the forecast windspeed. The assembled tower
is certied to wind forces equating to 27mph, but handling components under
those conditions would be hazardous. Also consider the wind funnelling effect
of nearby buildings.
•Towers greater than 8.2m platform height are for indoor use only.
•This structure is designed to be self-supporting under the loading condition
requirements of EN 1004-1:2020 and does not require tying in. Consideration
should be given to potential wind conditions if the tower is left unattended.

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2.2 Component Diagram
2 Building the Tower
Instruction
Manual
Horizontal
Brace
Span
Frame
4 Rung
Platform
(Fixed and
Trapdoor
Decks)
Ladder Frame
4 Rung
End Toe Board
Stabiliser
Span Frame
2 Rung
Ladder Frame
2 Rung
Adjustable Leg
Castor
Diagonal
Brace
Side
Toe
Board

6BoSS Ladderspan 3T Instruction Manual
2.3 Quantity Schedule BoSS 1450 Ladderspan to EN 1004: Available in 2 lengths - 1.8m and 2.5m
Internal or External Use Internal Use
Component
Code Component Working Height (m) 4.2 4.7 5.2 5.7 6.2 6.7 7.2 7.7 8.2 8.7 9.2 9.7 10.2 10.7 11.2 11.7 12.2 12.7 13.2 13.7 14.2
Platform Height (m) 2.2 2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2 6.7 7.2 7.7 8.2 8.7 9.2 9.7 10.2 10.7 11.2 11.7 12.2
32842300 Castor 150mm 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 33551300 Adjustable Leg 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 61151300 Ladder Frame 1450 2 Rung 1 - - 1 1 - - 1 1 - - 1 1 - - 1 1 - - 1 1 60551300 Span Frame 1450 2 Rung 1 - - 1 1 - - 1 1 - - 1 1 - - 1 1 - - 1 1 61051300 Ladder Frame 1450 3 Rung - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 60451300 Span Frame 1450 3 Rung - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 60951300 Ladder Frame 1450 4 Rung 1 1 2 1 2 2 3 2 3 3 4 3 4 4 5 4 5 5 6 5 6 60351300 Span Frame 1450 4 Rung 1 1 2 1 2 2 3 2 3 3 4 3 4 4 5 4 5 5 6 5 6
30151100/
30251100 Fixed Deck 1.8m and 2.5m 1 2 1 1 1 2 1 1 1 2 1 1 1 2 1 1 1 2 1 1 1
30451100/
30551100 Trapdoor Deck 1.8m and 2.5m 1 1 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 5 6 6 6
31251300/
34851300 Horizontal Brace 1.8m and 2.5m (red) 6 10 10 10 10 14 14 14 14 18 18 18 18 22 22 22 22 26 26 26 26
31351300/
31451300
Diagonal Brace 2.1m and 2.7m (blue) 4 6 6 8 8 10 10 12 12 14 14 16 16 18 18 20 20 22 22 24 24
30450900/
30550900 Side Toe Board 1.8m and 2.5m 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 30350900 End Toe Board 1.45m 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 30150900 Toe Board Holder 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 31751300 SP7 Fixed Stabiliser 4 4 4 4 4 - - - - - - - - - - - - - - - - 31851300 SP10 Telescopic Stabiliser - - - - - 4 4 4 4 4 4 - - 4 4 4 4 4 4 4 4 31951300 SP15 Telescopic Stabiliser - - - - - - - - - - - 4 4 - - - - - - - -
Tower Total Self-weight 1.8m (kgs) 116 145 149 159 163 211 216 226 230 258 263 288 292 304 309 319 323 351 356 366 369 Tower Total Self-weight 2.5m (kgs) 131 165 170 180 184 239 243 254 257 292 296 323 327 346 350 360 364 399 403 414 418 Max. Exerted Leg Load 1.8m (kgs) 150 150 160 170 180 190 200 210 220 240 255 270 300 300 300 310 310 310 320 320 320 Max. Exerted Leg Load 2.5m (kgs) 170 170 180 180 190 190 200 200 210 260 305 310 320 330 340 350 360 370 380 390 400
2 Building the Tower

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BoSS 850 Ladderspan to EN 1004: Available in 2 lengths - 1.8m and 2.5m
Internal or External Use Internal Use
Component
Code Component Working Height (m) 4.2 4.7 5.2 5.7 6.2 6.7 7.2 7.7 8.2 8.7 9.2 9.7 10.2 10.7 11.2 11.7 12.2 12.7 13.2 13.7 14.2
Platform Height (m) 2.2 2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2 6.7 7.2 7.7 8.2 8.7 9.2 9.7 10.2 10.7 11.2 11.7 12.2
32842300 Castor 150mm 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 33551300 Adjustable Leg 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 60851300 Ladder Frame 850 2 Rung 1 - - 1 1 - - 1 1 - - 1 1 - - 1 1 - - 1 1 60251300 Span Frame 850 2 Rung 1 - - 1 1 - - 1 1 - - 1 1 - - 1 1 - - 1 1 60751300 Ladder Frame 850 3 Rung - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 60151300 Span Frame 850 3 Rung - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 60651300 Ladder Frame 850 4 Rung 1 1 2 1 2 2 3 2 3 3 4 3 4 4 5 4 5 5 6 5 6 60051300 Span Frame 850 4 Rung 1 1 2 1 2 2 3 2 3 3 4 3 4 4 5 4 5 5 6 5 6
30151100/
30251100 Fixed Deck 1.8m and 2.5m - 1 - - - 1 - - - 1 - - - 1 - - - 1 - - -
30451100/
30551100 Trapdoor Deck 1.8m and 2.5m 1 1 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 5 6 6 6
31251300/
34851300 Horizontal Brace 1.8m and 2.5m (red) 6 10 10 10 10 14 14 14 14 18 18 18 18 22 22 22 22 26 26 26 26
31351300/
31451300 Diagonal Brace 2.1 and 2.7m (blue) 4 6 6 8 8 10 10 12 12 14 14 16 16 18 18 20 20 22 22 24 24
30450900/
30550900 Side Toe Board 1.8m and 2.5m 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 30250900 End Toe Board 0.85m 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 30150900 Toe Board Holder 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 31751300 SP7 Fixed Stabiliser 4 4 4 4 4 - - - - - - - - - - - - - - - - 31851300 SP10 Telescopic Stabiliser - - - - - 4 4 4 4 4 4 - - 4 4 4 4 4 4 4 4 31951300 SP15 Telescopic Stabiliser - - - - - - - - - - - 4 4 - - - - - - - -
Tower Total Self-weight 1.8m (kgs) 96 122 126 135 138 184 188 197 200 226 230 255 257 284 288 297 299 310 314 323 325 Tower Total Self-weight 2.5m (kgs) 106 139 142 152 154 208 211 220 223 256 259 285 288 305 308 318 321 354 357 367 369 Max. Exerted Leg Load 1.8m (kgs) 155 155 155 155 155 160 160 160 160 160 185 210 235 260 285 310 325 330 335 340 345 Max. Exerted Leg Load 2.5m (kgs) 140 140 150 150 150 150 160 160 170 170 175 200 230 230 240 250 260 270 280 285 285

8BoSS Ladderspan 3T Instruction Manual
If side walk-through access is required at the base
of 4.2m, 6.2m, 8.2m, 10.2m or 12.2m platform height
towers, high clearance frames may be used in place
of the four lower diagonal braces and two lower
horizontal braces.
High clearance frames must not be used in
conjunction with walk-through frames.
Assembly Variations
This section lists the permitted component variation from the Quantity Schedule.
Note: These substitutions must be made before assembly.
Stabilisers with Universal
Clamps may be substituted:
Other Castor sizes and types
may be substituted:
2 Building the Tower
Component
Code Description Weight (kg)
31842300 Diameter 150mm (Tyred) 3.2
32942300 Diameter 200mm 3.9
31942300 Diameter 200mm (Tyred) 3.9
Component
Code Description Weight (kg)
30051500 High Clearance Frame
1.8m 10.0
30151500 High Clearance Frame
2.5m 12.0
Component
Code Description Weight (kg)
31751400 SP7 4.0
31851400 SP10 9.0
31951400 SP15 13.1

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2 Building the Tower
If end walk-through access is required at the base
of 2.2m, 4.2m, 6.2m, 8.2m, 10.2m or 12.2m platform
height, 1450 wide towers, walk-through frames may
be used.
In this case the 1m ladder frame and span frame
must be tted above the walk-through frames.
Walk-through frames must not be used in addition to
high clearance frames.
Component
Code Description Weight (kg)
33151700 Walk-through Frame
2.0m 10.8
2.4 Stabilisers
X
X
90%
Double Width 1450 Tower Single Width 850 Tower
Platform Length Platform Length
1.8m 2.5m 1.8m 2.5m
SP7 3351 3629 2294 3201
SP10 4789 5100 4458 4734
SP15 5520 5838 5195 5485
SP10 and SP15 stabilisers must always be fully extended.
Position the lower clamp so that the arm is as close to horizontal as possible. Adjust
the position of the top clamp to ensure the stabiliser foot is in rm contact with the
ground. Ensure the clamps are secure.

10 BoSS Ladderspan 3T Instruction Manual
2 Building the Tower
2.5 Assembly
This tower structure must be assembled, and components oriented, in accordance
with this instruction manual. Deviation from this instruction manual is not permitted.
THIS TOWER MUST NOT BE USED AS AN ANCHOR POINT
FOR PERSONAL FALL PROTECTION EQUIPMENT.
•No tools are required for assembly.
•The assembly uses the 3T (Through the Trapdoor) method that provides
collective fall protection.
- From the sitting position in the trapdoor opening t all guardrails before
standing on the platform.
- Fit braces in the locations described
and ensure the claws are locked.
•The tower may be assembled by a single person, but it is recommended that
two or more are used to pass up components on the taller assemblies.
•Components must be lifted within the footprint of the tower using a reliable
method such as a strong rope with a clove hitch knot.
•Always start assembly with the smallest height frames at the base.
Platform Height (m) Frame at Base
2.2, 3.7, 4.2, 5.7, 6.2, 7.7, 9.7, 10.2, 11.7,12.2 2 Rung
2.7, 4.7, 6.7, 8.7, 10.7 3 Rung
3.2, 5.2, 7.2, 9.2, 11.2 4 Rung
•Where all three frames are specied, start with the 2 rung, 3 rung next and 4
rung on top. Refer to the quantity schedule for details.
•Castor brakes should be locked as soon as the tower base is in position.
•The tower base should be levelled to within 0.6° before continuing the assembly.
•The adjustable legs are for levelling the tower only and not to be used to gain
extra height.
•Ensure when the base is levelled the distance from the ground to the rst
climbing rung is less than 400mm.
•Stabilisers of the size specied in the quantity schedule should be tted at the
earliest opportunity.

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2.5.1 Assembly for 1450 Towers
Push castor into adjustable
leg. Push castor/adjustable leg
assemblies into 2 rung span frame. Lock
castors. Repeat procedure with 2 rung
ladder frame.
It is recommended that for ease of
levelling a gap of 50mm is left between
the bottom of the leg and the adjustable
nut. Adjustable legs are for levelling only.
You must not adjust all four to gain extra
height.
Fit one horizontal brace (red) onto
the vertical of a span frame, just
above the bottom rung, with the claw
facing outwards. The frame will now be
self-supporting.
Note: All locking claws must be opened
before tting.
2 Building the Tower
Unlocked
Locked
Locked
1
2

12 BoSS Ladderspan 3T Instruction Manual
2 Building the Tower
Position the ladder frame as
shown and t the other end of the
horizontal brace on to the vertical (just
above the bottom rung). Fit a second
horizontal brace between the bottom
rungs on the other side of the frames to
square the tower.
Fit two additional end frames,
ensuring the frame interlock clips
are engaged. Fit two diagonal braces
(blue) in opposing directions, between
the 1st and the 3rd rungs. Ensure the
frames are vertical and level by checking
with a spirit level and setting the
adjustable legs as required.
INTERLOCK CLIP
Locked
Unlocked
3
4

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2 Building the Tower
Fit a temporary deck on the lowest
rungs. Fit a trapdoor deck on the
4th rung (2.0m) with the trapdoor next
to the ladder. Ensure the trapdoor is
positioned with the hinges towards the
outside of the tower as shown. Climb the
ladder and, from the protected trapdoor
position, t guardrails on the 5th and 6th
rungs (in that order) on both sides of the
platform.
Do not climb onto the deck until all
guardrails are in place.
When horizontal braces are tted as
guardrails, they should be 0.5m and 1.0m
(1 and 2 rungs) above the platform level
in all cases. Remove the temporary deck
from the lowest rung.
Fit stabilisers
(see notes on page 9).
5

14 BoSS Ladderspan 3T Instruction Manual
2 Building the Tower
Add two more diagonal braces
between the 5th and 7th rungs. If
nishing at this height (4.2m platform)
reposition the xed deck to the 8th
rung on the tower. Fit a trapdoor deck
alongside it, with the hinges towards the
outside of the tower, and the trapdoor
next to the ladder. Add two more
diagonal between the 7th and 9th rungs
as shown. Climb up the ladder, and from
the protected trapdoor position, t the
guardrails on the 9th and 10th rungs, in
that order, on both sides of the tower.
Fit the next pair of diagonal braces
in opposing directions between
the 3rd and 5th rungs. Add two additional
end frames.
6
7

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Continue to add pairs of end
frames, diagonal braces and t
trapdoor decks as shown in the previous
steps. Add guardrails at 0.5m and 1.0m,
(in that order), above the platform from
the protected trapdoor position.
Do not climb onto the deck until all
guardrails are in place.
Continue until the required height is
reached. Re-position the xed deck to
the required platform height and t a
trapdoor deck alongside it as shown in
Stage 7. Fit a single diagonal at the top
of the tower as shown in Stage 7. Fit the
nal guardrails as shown in Stage 7.
Fit toe boards.
The tower is now complete.
2 Building the Tower
8
9

16 BoSS Ladderspan 3T Instruction Manual
2.5.2 Assembly for 850 Towers
The procedure illustrated shows a 3.2m platform height tower starting with a 4 rung
frame.
Insert adjustable leg/castor assemblies into end frames and lock the castors
(see diagram Step 1 - page 11). Base plates can be tted to the adjustable
legs if it is not necessary to move the tower. Fit two horizontal braces to the 850 end
frames as shown in Steps 2 and 3 for the 1450 tower procedure (pages 11 and 12).
Fit a trapdoor deck on the 2nd rung.
Fix the horizontal braces (red)
as guardrails on the 3rd and 4th rungs (2
and 4 rungs above the platform) on both
sides of the tower.
2 Building the Tower
1
2

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Fit two diagonal braces in
opposing directions between the
1st and 3rd rungs. Ensure that the frames
are vertical and level by checking with
a spirit level and setting the adjustable
legs as necessary. Fit stabilisers (see
notes on page 9). Fit the next pair of end
frames and check the frame interlock
clips are engaged.
Important - Only use the adjustment on
the legs to level the tower and not to gain
extra height.
Fit two pairs of diagonal braces
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.
2 Building the Tower
3INTERLOCK CLIP
Locked
Unlocked
4

18 BoSS Ladderspan 3T Instruction Manual
Climb up the inside of the tower
and from the protected position of
the trapdoor, t guardrails to the 7th and
8th rungs (in that order) on both sides of
the tower.
Continue the procedure until
the required working height is
reached, adding additional pairs of
end frames, diagonal braces and tting
trapdoor platforms, as shown on previous
steps. At every platform level, add
horizontal braces as guardrails from the
protected position within the trapdoor (as
shown in Step 5).
Fit two diagonal braces at the top of the
tower as shown.
Fit the toe boards.
The tower is now complete.
2 Building the Tower
2.6 Dismantling
To dismantle the tower, reverse the assembly procedure.
When removing the guardrails unlock the four claws furthest from the trapdoor and
return immediately to the protected position within the trapdoor. The other claws can
then be unlocked, and the guardrails removed from the tower .
5
6