Youngman Boss Plus User manual

USER guide
BoSS
LINKED PREFABRICATED
TOWER SCAFFOLD
3T Method
BS1139-6:2014
PLUS
This guide explains the generic methodology for safe assembly of a prefabricated tower scaffold system and
should be used in conjunction with the appropriate corresponding BoSS scheme drawing, EN1004 mobile
access tower user guide and product datasheet.
BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers

CONTENTS
Safety First
Build Method
3 - 6
7 - 12
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LINKED PREFABRICATED TOWER SCAFFOLD - LADDERSPAN + 3T
BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers

SAFETY FIRST
Introduction
Please read this BoSS Plus guide carefully. Please note that diagrams are for illustrative purposes only.
Standard BoSS tower user guides are available to download from our website at www.youngmangroup.com.
This guide explains the generic methodology for safe assembly of a prefabricated tower scaffold system and
should be used in conjunction with the appropriate corresponding BoSS; scheme drawing, EN1004 mobile
access tower user guide and product datasheet.
BoSS Plus prefabricated tower scaffolds are light-weight access platforms 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.
The law requires that personnel erecting, dismantling, altering or inspecting towers must be competent. Assemblers of
this BoSS Plus product must have a copy of this guide and copy of the appropriate corresponding scheme drawing.
For further information on the use of mobile access and working tower visit our website at www.youngmangroup.com or
consult the PASMA website at www.pasma.co.uk.
If you need further information, design advice, additional guides or any other help with this product, please contact
Youngman on [phone] or email [email protected].
Safe Use
- Check that all components are on site, undamaged and that they are functioning correctly. Damaged or incorrect
components must never be used.
- Ensure the ground on which the prefabricated scaffold tower is to be erected and moved on is capable of supporting the
tower.
- Detailed safe conditions of use can be found on the appropriate corresponding scheme drawing, which includes:
Type of prefabricated tower scaffold •
Number of working levels •
Maximum load per bay •
Maximum number of persons on the structure at any one time •
Maximum number of persons for assembly •
Rated for External or Internal Use (i.e. exposed to wind or not) •
Maximum wind load •
Maximum foot load •
Tie loads (where applicable) •
- Before each use:
Check that each prefabricated tower scaffold is complete and correctly assembled. •
Check that the prefabricated tower scaffold is vertical and make any adjustments as required. •
Check that no environment changes will affect the safe use of the structure. •
- Adjustable legs should only be used for levelling.
- Do not use ladders, steps, boxes or similar, to gain additional working height.
- Prefabricated tower scaffolds are not designed to be lifted or suspended.
- Do not abuse equipment.
- Beware of horizontal forces (e.g. power tools) which could generate instability.
Maximum horizontal force per working bay = 30kg
- 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.
- Ensure that the safe working load of the supporting decks and the prefabricated tower scaffold is not exceeded.
Youngman Group strongly advises against the mixing of tower components because of the potential safety risks for users
and their inability to rely upon the manufacturers Product Liability Insurance in the event of an accident occurring as a
result of mixing components from different manufacturers. For more information visit
www.youngmangroup.com/about/mix-match-components.
- It is recommended that prefabricated scaffold towers should be tied to a solid structure when left unattended.
- Safe working loads, normally expressed in kN/m², are expressed below in kg per bay based on square metre area of
the working platform:
1450mm Wide Bay - Load Rating
Class 1
0.75 kN/m²
Class 2
1.5 kN/m²
Class 3
2.0 kN/m²
Deck Length
1.3m 110kg 220kg 294kg
1.8m 156kg 312kg 416kg
2.5m 220kg 440kg 587kg
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BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers

SAFETY FIRST
Scheme Drawings
This user guide must be used in combination with the appropriate corresponding scheme drawing.
Below is a list of the current Youngman approved scheme drawings:
Maintenance - Storage - Transport
- Refer to the BoSS Inspection Poster for detailed inspection and maintenance advice.
- All components and their parts should be regularly inspected to identify damage, particularly to joints.
- Lost or broken parts should be replaced and any tubing with indentation greater than 5mm should not be used.
Adjustable leg threads should be cleaned and lightly lubricated to keep them free running.
- Brace claws, frame interlock clips, trap door latches and platform wind locks should be regularly checked to ensure
they lock correctly.
- Components should be stored with due care to prevent damage.
- Ensure components are not damaged by excessive strapping forces when transported.
Movement of the assembled prefabricated tower scaffold
BEFORE
The safe movement of any prefabricated tower scaffold shall be included in a specific risk assessment and take into
account:
- Site conditions:
Ground surface (such as potholes, unstable surfaces, inclines) •
Overhead obstructions (such as live electrical cables or building members) •
- Dimensions of the tower structure
- Consequences of overturning
If the site conditions are not adequate to permit the safe movement of a mobile tower structure, then it must not be
moved.
DURING
- Mobile tower structures shall be moved with the upmost caution:
Any stabilisers fitted must remain in position and raised no more than 25mm from the ground. •
Prefabricated tower structures must only be pushed using manual effort at or near the base. •
Movement of a mobile tower structure shall be no faster than 0.25 m/s (very slow walking pace) and sufficient •
number of persons shall be used to ensure the movement is fully under control.
No persons, tools or materials shall be left on the mobile tower structure during movement. •
AFTER
- After movement, the pre-use checklist on the final page shall be used to determine tower integrity.
DRAWING NO. DESCRIPTION
MP140710 CLIMA & BoSS INFINITY MULTIPURPOSE FRAME - 3T - TOP LEVEL WORKING ONLY
MP140711 CLIMA & BoSS INFINITY MULTIPURPOSE FRAME - AGR - TOP LEVEL WORKING ONLY
MP140712 LADDER/SPAN & BoSS INFINITY MULTIPURPOSE FRAME - 3T - TOP LEVEL WORKING ONLY
MP140713 LADDER/SPAN & BoSS INFINITY MULTIPURPOSE FRAME - AGR - TOP LEVEL WORKING ONLY
MP140714 CLIMA & BoSS INFINITY MULTIPURPOSE FRAME - 3T - ALL WORKING LEVELS
MP140715 CLIMA & BoSS INFINITY MULTIPURPOSE FRAME - AGR - ALL WORKING LEVELS
MP140716 LADDER/SPAN & BoSS INFINITY MULTIPURPOSE FRAME - 3T - ALL WORKING LEVELS
MP140717 LADDER/SPAN & BoSS INFINITY MULTIPURPOSE FRAME - AGR - ALL WORKING LEVELS
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BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers

Wind Exposure
- For wind loads, the prefabricated tower scaffold has been calculated for a wind load of 0.1kN/m², in accordance with
BS1139-6:2014.
- This approximately equates to a working wind limit of 27 mph (43 kph / 12 meters per second). Above this limit, all
work must stop and the prefabricated tower scaffold dismantled.
- The weather forecast must be taken into account before use.
- As part of the risk assessment, wind conditions must be taken into account and reviewed regularly, depending on the
duration of the prefabricated tower scaffolds assembly on site.
- Beware of high winds in exposed, gusty or medium breeze conditions.
- Beware of open ended buildings, uncladded buildings and building corners, which can cause wind funnelling effects.
SAFETY FIRST
Tying In
Where shown on the corresponding scheme drawing, the prefabricated tower scaffold must be tied in to a suitable load
bearing structure (i.e. building) to prevent overturning. Tie loads, where applicable, are specified on the corresponding
scheme drawing.
When used, select and install anchors in concrete and masonry must be selected and installed in accordance with BS
8539. This prefabricated tower scaffold has been designed to be properly secured (when applicable) to a suitable
adjacent supporting structure capable of withstanding the forces that will be imposed upon it by the attachment of the
tower. Devices for securing the tower must be simultaneously rigid in both tension and compression and capable of
withstanding and transmitting the loads imposed by the tower to the supporting structure.
Use of prefabricated tower scaffolds for access to adjacent structures
The tower must be built on base plates and properly secured to an adjacent supporting structure to prevent movement
of the tower away from the structure at the point of access.
There must be no gap between the platform of the prefabricated scaffold tower and the place being accessed through
which a person, tools or materials could fall or partially fall or which could cause a person to trip.
The platform of the prefabricated scaffold tower and the surface onto which a person will step when accessing another
place must be at the same level. Means of protection must be removed only for the time and to the extent necessary to
gain access or egress or for the performance of a particular task and must be replaced as soon as practicable. The task
must not be performed while means of protection are removed unless effective compensatory measures are in place.
Provision must be made to prevent falls - not only from the prefabricated tower scaffold, but also from the adjacent
structure.
Handover of the prefabricated scaffold tower
If the prefabricated tower scaffold is to be assembled and left for a third-party to use on site, copies of this guide, the
corresponding scheme drawing, standard tower user guide and the design certificate must also be left. The Handover
Certificate (TDF-HC0001) shall be used as part of the handover from the assembler. Details required to complete this
certificate are to be found on the scheme drawing.
In accordance with BS1139-6:2014, the “Conditions for Safe Use” information shall be affixed to the base of the
prefabricated tower scaffold by means of the Scheme drawing and the Handover Certificate. They must be clearly
visible so that end users are aware of the conditions of safe use.
Wind Speed Table
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BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers

SAFETY FIRST - TOWER BUILD
Assembly Procedure
A minimum of two persons are recommend for assembly and disassembly of this prefabricated tower structure. The
maximum number of persons for assembly is stated on the corresponding scheme drawing.
The prefabricated tower scaffold must be assembled, and components orientated, in accordance with this guide and the
corresponding scheme drawing.
Platforms must be installed with vertical distances between them not exceeding 2.1m when assembling and dismantling.
The maximum number of people on a working platform level permitted to simultaneosly exert a horizontal load of 30kg is:
- 1 person per bay for bays less than 4m long and
- 2 persons per bay for bays greater than 4m in length
The upper platform height shown on the corresponding scheme drawing is the maximum platform height limit for that
configuration. Heights in advance of that specified height are not covered within the scheme design and will require
additional specific verification.
The scheme drawings show prefabricated tower scaffolds consisting of 5 bays. Additional bays can be added, or removed,
as required on site.
The scheme drawings show prefabricated tower scaffolds using 2.5m long bays. Shorter bay lengths can be used, as
requred.
Conditions of safe use can be found on the corresponding scheme drawing and this must be provided to the end user. The
PASMA handover certificate can be used to transfer this information to the end user as part of the handover process.
Check that all components, tools and safety equipment are on site, undamaged and that they are functioning correctly,
particularly the brace claw locking mechanism.
Damaged or incorrect components shall not be used.
Component weights can be found on the corresponding BoSS Product Datasheets.
Check that the ground on which the tower structure is to be erected and moved is capable of supporting the tower and
within the levelling limits of the tower system.
Check overhead that the area into which the tower structure is to be built contains no obstructions, particularly electrical or
radio radiation hazards.
Never stand on an unguarded platform positioned above the first rung of a tower structure. If your risk assessment shows
it necessary, you may also need to guardrail platforms at this level.
Tower components 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 structure.
Stabilisers or outriggers and ballast must always be fitted when specified. If ballast is necessary, it must be secured in
position and made of rigid material such as steel or concrete, but excluding liquids or granular material.
Ensure horizontal braces and guardrails
are fitted correctly.
Ensure interlock clips on frame
memebrs are in the 'locked' position.
Ensure wind locks are engaged before
moving onto the deck levels.
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BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers

BUILD METHOD
1
Build the standard BoSS tower with the platform height of 6.0m. Refer to BoSS user guide. Ensure that the 3T
method is followed. The procedure illustrated shows 8.2m platfrom height tower starting with a 2 rung frame.
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BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers

BUILD METHOD
2
Build two more towers and space them equally using Horizontal Braces which link all towers. Fit Diagonal Braces
between towers, as shown on the appropriate corresponding scheme drawing.
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BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers



BUILD METHOD
3
Fit 4 Rung Ladderspan Frame at one end and 4 Rung Span
Frame at the other end. Attach Guardrail Frames to the BoSS
Infinity Multipurpose Frames. Fit subassemblies noting the
orientation of ladders to the central end frames. Ensure the
Guardrail Frames open inwards, as indicated with arrows.
Ensure all interlock
clips are engaged.
4
Fit Diagonal Braces between 13th
and 15th rungs, as shown.
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©
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FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers

BUILD METHOD
6
Fit Diagonal Braces between 15th and 17th rungs, as shown.
5
Fit Trap Door Decks and Fixed Decks, as
shown. Ensure the trap doors are
positioned on the ladder side of the frames.
Ensure all wind locks are engaged.
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©
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FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
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BUILD METHOD
7
From the protected trap door position fit Horizontal
Braces as guardrails on the 2nd and 4th rungs (in
that order) above the platform level.
Do not climb the deck until it is fully guardrailed.
8
Fit Horizontal Braces to link the towers, as shown.
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LINKED PREFABRICATED TOWER SCAFFOLD - LADDERSPAN + 3T

323 LG INFILL DECK
615 LG INFILL DECK
BUILD METHOD
9
Fit Fixed Decks between towers. Ensure all
wind locks are engaged.
10
Fit Toe Board Brackets, Side Toe Boards and End
Toe Boards (see image below) to the working level.
Fit 615 LG Infill Decks and 323 LG Infill Decks (see
detail on the right) to the working level.
Remove all Guardrail Frames from the BoSS
Infinity Multipurpose frames. Move Stabilisers so
that they are parallel to frames.
The build is now complete.
To dismantle the tower:
Simply follow the assembly steps in reverse,
ensuring that the 3T method is followed.
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BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers

[phone]
[email protected]
www.youngmangroup.com
Head Office and Customer
Services
The Causeway, Maldon,
Essex. CM9 4LJ.
United Kingdom
Pre-use Safety Inspection Checklist
Tower structure upright and level •
Castors locked and legs correctly adjusted •
Diagonal braces fitted •
Stabilisers fitted as specified •
Platforms located and wind locks engaged •
Interlock clips engaged •
Toe boards located •
Check guardrails are fitted correctly & positively locked •
Tower use information and handover certificate in place •
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LINKED PREFABRICATED TOWER SCAFFOLD - LADDERSPAN + 3T
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BoSS IS A REGISTERED TRADEMARK OF YOUNGMAN GROUP LTD
©
YOUNGMAN GROUP LTD - 29/01/2015
FOR UP TO DATE INFORMATION ON THIS PRODUCT CHECK
www.youngmangroup.com/brands/BoSS-towers