Boss Stairmax 700 MK2 User Manual

Aluminium Tower

700 Climbing Rung

3T - Through The Trapdoor Method

USER GUIDE

STAIRMAX

700

MK2

BoSS Stairmax

700

MK2 User Guide

1

Contents

Safety First

Component Diagram

Component Quantity & Safety Data Schedule

Build Method

Pre-use Safety Inspection Checklist

9

10

11-12

13-19

20

2

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Safety First

Introduction

Please read this user guide carefully. Please note that
diagrams are for illustrative purposes only. User guides
are also available to download from our website at
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.

This user guide provides you with step by step instructions to
ensure your system is erected easily and safely, using the 3T
(Through The Trapdoor) method.

The law requires that personnel erecting, dismantling or altering
towers must be competent. Any person erecting a BoSS mobile
tower must have a copy of this user guide. For further information
on the use of mobile access and working towers consult the
PASMA operators code of practice.

If you need further information, design advice, additional user guides
or any other help with this product, please contact the manufacturer
on [phone] or email [e-mail].

BoSS Stairmax

700

MK2 User Guide

3

Safety First

Safe use

• Check overhead that the area into which the structure is to be

erected contains no obstructions, particularly electrical or radio
radiation hazards.

• Ensure the ground on which the mobile access tower is to be

erected is capable of supporting the tower in use. Refer to Safety
Data Schedule.

• The tower has a single working level with a safe working load

of 275kg. All platforms may be used for working, but only one
should be used at any one time.

• 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 purposes and

never to gain extra height.

• Do not use ladders, steps, boxes or similar, to gain additional

working height.

• Only climb the tower from the inside using the access method

provided.

• Tower scaffolds are not designed to be lifted or suspended.

• Beware of horizontal forces (e.g. power tools) which could

generate instability.

Maximum horizontal force per working bay = 30kg

• T ools 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).

• Safe working loads, normally expressed in kN/m², are expressed

below in kg per dened working area.

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Safe use

Dened
working
area

Max. safe
working load
(uniformly
distributed
including
persons)

Load
class

Max no. of
persons*

A x Z 275kg 3 1

*Persons are assumed to be 122kg (Reference to HSE

- Revision of body size criteria in standards protecting
people who work at height - Research report 342)

Safety First

Access classes

The Access Class provided for climbing this tower is: Access Class
'D' (Vertical Ladder).

Lifting of individual tower components

Movement of the assembled prefabricated
tower scaffold

Raising and lowering components, tools and/or materials by rope
should be conducted within the tower base (i.e. within the area
bounded by the stabilisers). Ensure that the safe working load of
the supporting decks and the tower structure is not exceeded.

• The BoSS StairMAX 700 Mk2 tower system MUST NOT be

moved once erected.

• Always dismantle it and rebuild at the new location.

• The pre-use checklist on the nal page shall be used to

determine tower integrity.

BoSS Stairmax

700

MK2 User Guide

5

Safety First

During assembly, use and dismantling

• As part of the risk assessment, wind conditions must be taken

into account and reviewed regularly, depending on the duration
the structure is onsite.

• The structure has been assessed for wind loads equating to 27

mph (43 kph, 12 m/s).

• The effect of onsite wind conditions must be considered prior

to the assembly of a tower. The tower must not be used in wind
speeds stated above. If greater wind speeds are forecast, the
tower must be dismantled while it is still safe to do so.

• Sheets, tarpaulins, cladding or similar, must not be attached to

the tower as these will signicantly increase any side loads from

wind and will potentially make the tower unstable.

• Beware of wind turbulence, funnelling effects around buildings

and updraughts on stairways.

The maximum allowable side load on a tower is 30kg.

• CAUTION: Excessive side loads due to working from the

tower may cause the structure to become unstable. Special
consideration should be given to side loads including vibrations.

• Do not abuse equipment. Damaged, incorrect or incompatible

components should not be used.

Maintenance - Storage - Transport

• 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
shall be replaced. Adjustable leg threads should be cleaned and
lightly lubricated to keep them free running.

• Brace claws, frame interlock clips, trapdoor latches, camlocks and

platform wind-locks should be regularly checked to ensure they
lock correctly.

• Refer to the BoSS Inspection Manual for detailed inspection and

maintenance advice: www.bossaccesstowers.com

• Components should be stored in clean, dry conditions with due

care to prevent

• Ensure components are not damaged by excessive strapping

forces when transported.

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Safety First

Tower designation & safety data

Wind
Description

Beaufort
Scale

Beaufort
No.

Speed in
mph

Speed in
m/sec

Medium Breeze

Raises dust and
loose paper, twigs
snap off

4 8-12 4-6

Strong Breeze

Large branches in
motion, telegraph
wires whistle

6 25-31 11-14

Gale Force Walking is difcult 8 39-46 17-21

In accordance with the prefabricated tower scaffold standards,
the ‘Tower Designation & Safety Data’ shall be positioned at
the base of the prefabricated tower scaffold as shown within
the user guide, by means of the ‘Tower Designation Information
Assembly’. It must be clearly visible so that users are aware of the
conditions of safe use. Refer to Safety Data Schedule for content.

CAUTION:
Always ensure the portal ladder is in closed position when

descending the tower. If the portal ladder is in open position, from
the protected position of the trapdoor deck (i.e. seated) close the
portal ladder ensuring the locking claw has been fully engaged.

• The structure is highly conductive and must not be used when

there is a risk of lightning strikes.

• Exercise caution when touching unprotected metal components

in extreme high or low temperatures.

• If the tower is damaged in any way while in service, it shall not be

used again until the damaged components are replaced.

BoSS Stairmax

700

MK2 User Guide

7

Stabilisers

Props

• Stabilisers shall always be tted when

specied.

• Attach one stabiliser to each corner of the

tower as shown. Ensure stabilisers feet are

equally spaced to form a square.

• Telescopic stabilisers must always be fully

extended.

• Position the lower clamp so that the lower arm is as close to

horizontal as possible. Adjust the position of the upper clamp to
ensure the stabiliser foot is in contact with the ground. Ensure
clamps are secure.

Safety First

BoSS StairMAX 700 Mk2 tower with platform heights above 5.0m
shall be adequately propped or tied to prevent all movement in the

horizontal plane. They must be tted at a minimum of 4.0m vertical

intervals. To improve stability, additional props or ties can also be

tted at lower levels.

Props and ties should conform to the guidance in NASC TG20.

The method shown below illustrates the use of BoSS Conned

Space Stabilisers.

Attach one conned space stabiliser to each corner of the tower as

shown (see page 16). Ensure stabiliser feet are touching the walls -

adjust conned space stabilisers as necessary to achieve this.

If you require further advice, please contact the manufacturer.