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TRAD Stair Tower User Guide

You should read and ensure you understand this manual in its entirety prior to commencing work.

Only trained and competent operatives should erect, dismantle or modify TRAD Stair Tower Systems at any time.

PLEASE NOTE

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© TRAD Hire & Sales Limited 2012

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GUIDANCE NOTE

This manual is valid only for the use of Genuine

TRAD Stair Tower manufactured and supplied by

TRAD Hire & Sales Ltd.

TABLE OF CONTENTS

About TRAD Hire & Sales Ltd

About TRAD Stair Tower

TRAD Stair Tower & Safety

Manual Handling

Safety on Site

General Rules for Safety

Components

Erection Guidance

Basic Erection Sequence

Basic Dismantling Procedure

Advanced Guardrail System

Anchorage and Tying

Load Data

Personnel Capacities

Safe Working Heights

Other Products

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AB

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SALES LTD

TRAD Hire & Sales is one of the UK’s

market leaders for the supply of system

scaffolding, scaffold tube, fittings, boards,

stair towers, temporary roofing systems

and associated equipment.

All the products we stock are of the highest

quality and comply fully with all relevant

British or European Standards. In addition,

with our commitment to exceeding all safety

standards, all our products, whether sourced

internationally or within the UK, are subject

to thorough testing by qualified external UK

testing bodies.

From the smallest requirement up to complete

hire or sale packages, our UK-wide network

of depots have the resources and capabilities

to meet every demand.

TRAD Hire & Sales Ltd is a full non-contracting member of the National Access and Scaffolding Confederation ( NASC ) and is a fully accredited ISO 9001 company.

ISO 9001: 2008REGISTERED FIRM

ABOUT TRAD Hire & Sales Ltd

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TRAD Stair Tower is an independent access stair system designed to provide safe and efficient access to on-site work locations. The TRAD Stair Tower is comprised of high quality manufactured prefabricated components. The Stair Tower is assembled from steel standards, ledger beams, purlin rails / frames, stair flights, landings, guardrails and handrails. The TRAD Stair Tower is a flexible and versatile system designed for use as an independent structure or for integration into other Scaffolding Systems or Stagings.

All components are manufactured from high quality galvanised steel conforming to current

British and European standards. All components are marked with TRAD identification and month / year of manufacture to provide full traceability. Components are subject to regular testing by independent and approved UK testing facilities.

This guide sets out the basic system components and configuration. The Stair Tower System is flexible and versatile in use. For further information on TRAD Stair Tower components and applications please contact your nearest TRAD Hire & Sales branch (locations are detailed on the rear cover of this guide).

ABOUT TRAD STAIR TOWER

TRAD Stair Tower offers many benefits including:

Strength TRAD Stair Tower design makes it extremely robust with permissible loads (personnel) exceeding those of alternative stair systems.

Speed The system design makes the TRAD Stair Tower faster and simpler to build than alternative stair systems.

Flexibility TRAD Stair Tower can be used as an independent stair or in conjunction with traditional tube and fitting scaffolding or system scaffolding.

Cost Savings The TRAD Stair Tower is easy to assemble and is designed to maximise productivity and improve efficiency on site.

TRAD Stair Tower is manufactured to the highest possible standards thereby ensuring the quality of each item. TRAD Stair Tower is tested and designed in line with the ISO 9001 series of quality management systems.

Furthermore, TRAD Stair Tower and it’s associated products offer compliance with the following:

BS EN 12810 Part 1 Façade Scaffolds Made of Prefabricated Components: Product Specifications

BS EN 12810 Part 2 Façade Scaffolds Made of Prefabricated Components: Particular Methods of Structural Design

BS EN 12811 Part 1 Scaffolds – Performance Requirements & General Design

BS EN 12811 Part 2 Information on Materials

BS EN 12811 Part 3 Temporary Works Equipment – Load Testing

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ATTACHMENT CAN BE MADE TO THE FOLLOWING COMPONENTS!

TRAD Stair Tower standards between 2 lifts (ledger beams secured above and below).

Ledger beam or single tube ledger secured at both ends.

TRAD Stair Tower handrails or guardrails. Any component not secured at both ends.

Competence of individuals working at height

is now a direct requirement of the current

“Work at Height” Regulations. Consequently,

employers have a duty to ensure that all

individuals involved in the erection, modification

or dismantling of any scaffolding equipment

have received the training necessary to enable

them to execute their work in a safe manner.

This User Guide and availability of specific and

dedicated training courses for TRAD Stair Tower

System (via our nationally accredited training

partners) ensures that all users have access to

achieve the requisite level of competence.

For further information please contact your local

TRAD Hire & Sales Ltd. Depot, details of which

can be found on the rear cover of this guide.

TRA

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TRAD STAIR TOWER & SAFETY

Competence of Erectors1

The current edition of the Work at Height

Regulations places a duty on employers to

protect individuals from harm. Scaffolding

inevitably carries a risk of falls from height and

consequently, it is of paramount importance

that a safe system of work be adopted during

any scaffold activity. It is therefore strongly

recommended that the procedures outlined in

the NASC’s guidance note SG4 – ‘Preventing

Falls in Scaffolding and Falsework’ are followed.

SG4 describes several safe methods of work,

including the use of collective fall protection

systems such as the advanced guardrail and

the scaffolder’s step.

Work at Height/Fall Prevention2

Harness and Lanyard Anchor Points

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To ensure the safety of TRAD Stair Tower erectors, it is important that fall protection equipment is only attached to those components that are capable of withstanding any likely imposed loads. This section details the key components and their ability to take attachment (in preferential order). Please note that all scaffolds must be erected in accordance with this guide to be deemed as acceptable for attachment.

GUIDANCE NOTE

Attachment must not be made to:

While the current Work at Height Regulations requires that work at height be carried out safely, they also require that contingency plans be made for any eventuality. This extends to making plans to rescue personnel suspended by fall arrest equipment. Personnel should be fully trained to use all relevant rescue equipment for the event of a suspended casualty.

Note: Details relating to rescue and what should be considered can be found in the latest editions of the NASC guidance notes SG4 & SG19 (SG19 – “A Guide to Formulating Rescue Plans”).

Rescue of Suspended Casualties

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The following basic rules should be adhered to when manually handling the TRAD Stair Tower System and associated components.

Plan lay down / storage areas in advance to reduce the distance materials have

to be manually handled.

Always check the transit route before manual handling to ensure that it is suitable

and free from obstructions and any tripping hazards.

When handling long materials beware of damage to property, overhead electric

lines, other people and moving vehicles.

Only tackle loads that can be reasonably handled by the individuals involved –

i.e. consider personal physical capabilities.

Manual handling operations should be eliminated where possible by using

mechanical handling equipment and manual handling aids whenever possible.

These include light-lines, gin wheel, forklifts and cranes etc.

Use the correct knots and hitches if using rope to lift equipment.

Feet on a firm level base a comfortable distance apart (approx. 300 mm).

Use your legs and not your back to bend.

Raise your head slightly and tuck in your chin to keep your spine straight.

Avoid twisting with the trunk of the body.

Always use the correct kinetic handling technique:

GUIDANCE NOTE

MANUAL HANDLING

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As is the case with any scaffold erection, dismantling or modification, consideration must always be given to those that may be affected by the works being carried out. To ensure that the highest standards of safety performance are maintained, consideration should be given to the following:

If the scaffold is on rough or uneven

ground, ensure that it is erected on

adequate timber sole boards that are

properly levelled and bedded and that

the ground is capable of withstanding

proposed loadings.

All entrance steps, stage landings and

stair flights must be free from obstructions,

trip hazards or projections. Where there are

risks of items falling from stage landings

the TRAD Stair Tower toe board should

be considered for use.

Do not load stage landings with materials.

All materials are to be stored on scaffolds

or loading towers.

All scaffolds require adequate bracing and

ties. Neither should be removed without

giving consideration to firstly installing

alternative bracing or ties, to ensure the

continued safety of the scaffold.

All scaffolds must be erected in strict

accordance with this user guide. Any

configurations outside the scope of this

guide including sheeting, netting or other

similar wind sails should be referred to

a person competent in the design of

TRAD Stair Towers.

Any unauthorised interference should be

immediately reported to site management

with any incomplete or unsafe parts of

the scaffold being clearly marked and

access restricted.

All TRAD Stair Tower components require

visual inspection before use. No damaged

equipment should be used within the

scaffold structure. Any equipment found

damaged should be immediately set aside

in a quarantined area, clearly marked and

senior management must be informed.

Maintenance and repair procedures should

only be carried out by qualified / approved

personnel.

Always wear appropriate PPE with Hi-Vis

where required.

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SAFETY ON SITE

Head protection

Protective overalls

Steel toe cap boots

Eye protection (where required)

Full harness fall arrester

Protective gloves

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GEN

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SAFETY

GENERAL RULES FOR SAFETY

Always ensure all risk assessments and

method statements have been carried

out, communicated to those concerned

and understood.

Always ensure that there is safe and

adequate storage for the materials.

Always ensure that there is clear access to

the work area and that the ground is level

and suitable for the scaffold.

Always ensure all who erect, adapt and

dismantle the scaffold are trained and

competent to do so.

Always work to current SG4 guidelines.

Always ensure that there are adequate

tying points.

Always ensure that stair flights and stage

landings are free from obstructions or

trip hazards.

Always ensure scaffold inspections are

carried out and recorded as per current

legal requirements.

Always ensure that all defects are notified

to site management immediately.

Never remove guardrails or toe boards.

Never remove ties without prior approval.

Never remove restrictions or warning

signs from the scaffold structure.

Never undermine the scaffold by digging

trenches under or near to the base.

Never add sheeting or netting without

prior approval.

Never let untrained persons erect, modify

or dismantle the scaffold.

Never use damaged materials.

Never allow unqualified / unapproved

personnel to repair damaged equipment.

Never load equipment directly onto

the Stair Tower System.

Safety is no accident. Don’t risk it – if in doubt ask!

REMEMBER

The information given in this TRAD Stair Tower user guide relates solely to TRAD Stair Tower equipment supplied by TRAD Hire & Sales Limited.

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These form the vertical members of the Stair

Tower. 3.0m and 2.0m are the common sizes.

Each standard has connection / node points

(lugs) every 500mm.

CodeLength (m)

Weight (kg)

159502 3.0 15.72

159503 2.0 10.78

Standards1

Stair Handrails2

These provide a single guardrail function and

are available in 3.0m, 2.16m and 1.6m sizes.

CodeLength (m)

Weight (kg)

149109 3.0 8.76

159544 2.16 7.95

149111 1.6 6.60

Purlin Rails3

Provide double handrail functionality for all stair

flights and at the stage landing level. Available

in 3.0m and 1.6m sizes.

Purlin Frames4

CodeLength (m)

Weight (kg)

159530 3.0 12.96

159532 1.6 8.74

COMPONENTS

Provides double handrail for all stair flight sizes.

Available in 2.0m, 1.5m and 1.0m sizes.

CodeLength (m)

Weight (kg)

159549 2.0 10.45

159550 1.5 9.55

159551 1.0 9.00

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The TRAD Stair Tower is built using 3.0m ledger beams and 1.6m single tube ledger beams at platform / landing level. The 3.0m ledger beam acts as the transom beam and the 1.6m single tube ledger beam acts as the ledger beam. The landings are fitted to the transom beams prior to installation of the flights. The 1.6m ledger beam is an interchangeable alternative to the 1.6m single tube ledger beam.

CodeLength (m)

Weight (kg)

159516 3.0 15.06

159581 1.6 7.16

159519 1.6 8.15

Provides initial step access to first level

stage landing.

CodeLength (m)

Weight (kg)

159554 1.6 13.5

Entrance Steps5

Provide interconnecting stair access to each lift

of the Stair Tower. Access and egress to the stair

flight via connected stage landing. Available

in 2.0m, 1.5m and 1.0m sizes.

Stair Flights6

CodeLength (m)

Weight (kg)

159546 2.0 35.10

159547 1.5 28.50

159548 1.0 42.50

Beams7

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Fitted to stage landing to provide connection

points for stair handrails.

Handrail Posts9

Fitted to the 3.0m ledger beams to provide

connection points for stair flights. Provide

access and egress points at working lifts.

CodeLength (m)

Weight (kg)

159552 1.6 23.2

Stage Landings8

CodeLength (m)

Weight (kg)

159553 1.0 5.16

Fitted to ledger beam and connected to 2.16m

guardrails when providing access or egress at

side of tower.

Clip On Posts10

CodeLength (m)

Weight (kg)

159542 1.0 6.60

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Provides double handrail on stage landing

at entrance to Stair Tower.

CodeLength (m)

Weight (kg)

159556 N/A 8.71

Folding Guard Frame11

Base jack incorporating base plate provides

levelling foundation for the standards of the

TRAD Stair Tower. Provides means of vertical

adjustment of the standards to ensure that

the ledger beams are level.

CodeLength (m)

Weight (kg)

127005 65 3.4

Base Jack12

Fitted to stage landing on final lift of Stair

Tower. Completes double handrail on top

stage landing.

CodeLength (m)

Weight (kg)

159555 N/A 6.95

Guardrail Frame13

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Fitted to edge of stage landing to prevent

materials or operatives’ falling or slipping off

the platform.

Fitted to the 3.0m ledger beams to provide

safe and lightweight means of constructing /

assembling the Stair Tower components.

CodeWeight (kg)

Stair End Toe Board 159625 7.0

Stair Side Toe Board 159630 3.05

Stair Top Toe Board 159635 3.05

Toe Boards14 Erection Platform15

Additional components outside the standard

component set for the TRAD Stair Tower System

may be required to enable use in accordance

with this user guide. These components

will normally constitute loose scaffold tube

compliant to EN39 standard and scaffold

couplers compliant to EN74 standard.

Additional Components16

Stair Top Toe Board

Stair Side Toe Board

Stair End Toe Board

CodeLength (m)

Weight (kg)

159620 1.6 14.5

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This section describes the basic erection and dismantling procedures for the TRAD Stair Tower.

As with all scaffolding, only trained, competent operatives should erect, dismantle or modify the TRAD Stair Tower at any time.

TRAD Hire & Sales Ltd. recommends, that as a minimum, the working practices for all scaffold activities set out in the NASC’s document SG4 – ‘Preventing Falls in Scaffolding & Falsework’, are applied at all times.

Prior to commencing work, make sure all method statements, risk assessments and permits are in place and that suitable tie points are available.

Ensure that the ground is level, firm and capable of taking the imposed load of the completed stair tower. Where required, use sole boards / spreader plates of a suitable size to spread the load over the ground.

Ensure that the structure against which the tower is erected and upon which it relies for it’s stability is a sound and inherently stable structure.

Set out the Stair Tower according to the ground levels and working platform heights required. Start constructing the tower from the most convenient point and, where practicable, at the highest ground level.

It is recommended that work to erect and dismantle the Stair Tower be carried out by a minimum of two operatives.

If using an alternative advance guardrail or scaffolder’s step information relating to the use of these products should be obtained from the original supplier.

Ensure that the recommended harness and lanyard guidance notes are observed at all times (see section TRAD Stair Tower and Safety).

ERECTION GUIDANCE

BASIC ERECTION SEQUENCE

Lay out sole boards. Set out the 4 base jacks

at the position of the Stair Tower standards.

Adjust the base jacks to estimated final height.

Step 1

Erect the first standard on to base jack. Ensure that pockets are running in direction as shown (lower pocket, 1.65m direction, upper pocket 3.05m position).

Step 2

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Connect 3.05m ledger beam to higher level

pockets. Connect 1.65m ledger beams to

lower level pockets.

Step 3

Engage all locking catches as you proceed.

Step 4

Check distance from structure.

Step 5

Level first lift following clockwise direction. Level by adjusting base jacks as necessary.

Step 6

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Check base lift is square using a tape measure.

Step 7

Place first stage landing or erection platforms on ledger beams as shown (on left of picture). Place second stage landing at opposite end of bay (foot lift on right of picture).

Install second level of ledger beams. Next landing (upper lift), is located by working off stage landing. The landing on this lift, and all further lifts, are initially positioned on ledger beams approximately 0.5m from end of bay.

Step 8

Fit entrance step to tower.

Step 9

The stair tower must be anchored to the structures at each platform level on both ends (inner and outer standards) using scaffold tube and couplers.

Step 10

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11C

11B

11D

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Stair flight is positioned vertically and located into pockets of lower landing (11A). Flight is

then lowered onto landing above (11B) and pushed along (11C) until top of stair flight is fully

located into pockets of upper landing (11D).

Note: At this stage check top and bottom of stair is fully engaged into both

landing pockets. Stair flights should be erected for a clockwise ascent.

Step 11

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© TRAD Hire and Sales Limited 2012

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Re-position stage landing onto next lift directly

above lower landing.

Fit folding guard frame into handrail post and

standard at entrance of stair.

Uppermost erector clips to mid point of ledger

beam. Both erectors then fix stair handrail post

into top and lower landings. Then, stair handrail

is located into pockets of posts and locking

catch engaged.

Fit guardrail frames and guardrails to the

outside face of the stair flight.

Step 14

Step 13

Step 15

Step 12

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Fit guardrail frames to face and end of

tower as shown. Fit ledger beams to next

lift required (1.5m or 2.0m). Re-hook to

upper ledger near standards.

Next standards are added to all four legs.

Temporary clip-on post may now be removed

to a safe place until it is required again.

Erector 2 proceeds up stair flight onto landing,

hooks onto ledger beam close to standard.

Erector 1 proceeds up stair flight and fits

temporary clip-on post to ledger beam close to

stage landing. Erector 1 then hooks to ledger,

and, using clip-on post for support, he climbs

onto stage landing.

Note: Clip-on post is only used to facilitate

climbing to exposed landing.

Step 16 Step 17

Step 18 Step 19

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FOR SIDE EXIT – Erector 1 is safely standing on landing and fits clip-on

post to inside ledger beam. Erector 2 standing on erection platform at

opposite end of tower hooked onto the ledger beam. Both erectors then

fit 2.16m guardrails or 2.16m guardrail frame into clip-on post and standard

ensuring locking catches are engaged. Means of access/egress at side of

tower is then complete.

Entrance/exit at top of tower. Erector 1 is safely

standing on landing and hooked on to the

ledger beam, fits 3.0m guardrail frame with

erector 2 safely standing on erection platform

at opposite end of tower, hooked onto the

ledger beam. Erector 1 then fits top guard

frame into handrail post and landing as shown.

Ties should be fitted to structure and tower at

each level before erecting next lift.

Note: For further lifts repeat procedures 8,

11-13, 15-20 until reaching final exit

level or mid exit points.

Step 22

Step 21Step 20

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TOE BOARDS – Toe boards are optional and

can be fitted on completion of the installation

of the stage landing and the upper and lower

stair flights. Side toe boards are hooked over

the ledger beams by the erector and the end toe

boards are fitted to the Stair Tower standards by

inserting the end hooks into the lugs.

FOR END EXIT – Erector 1 is safely standing on

landing. Erector 2 standing on erection platform

at opposite end of tower hooked onto the

ledger beam. Both erectors fit 3.0m guardrail

frame at each side of tower. Remove 1.6m guard

from landing position. Means of access/egress

at end of tower is then complete.

For construction of the TRAD Stair Tower

with the 3.0m face parallel to the structure or

scaffold (side exits). Using tube and couplers,

the tower should be tied to the structure below

each lift position (except first lift) through both

inside and outside standards.

Step 23

Step 24

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ACCESS POINTS – It is only possible to have a

side access point (3.05m) in a 2.0m lift. Access

to / from end of tower (1.6m) is not restricted.

When the 1.6m ledger beam (double) is used

this may need to be raised to create headroom

when the access lift is less than 2.0m.

Top toe boards are fitted to by means of

connecting the toe board hooks around the guard

frame and into the lugs of the handrail post.

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Remove handrail posts and handrail

simultaneously (two erectors) and lower

to ground level.

Remove any toeboards and associated brackets

and again transfer to the ground.

The top working platform can now be

dismantled paying particular attention to the

current NASC guidance note SG4 – ‘Preventing

Falls in Scaffolding and Falsework’. If using

an advance guardrail or scaffolder’s step

information relating to the use of these

products should be obtained from the

original supplier.

All components fixed above the top platform’s

guardrails should be removed. Components

should then be lowered to ground level.

Check that the Stair Tower is still in the

properly erected condition. Make sure that all

components and ties have not been interfered

with and all platforms are clear of any loose

material and debris prior to dismantling. Report

any problems to site management immediately.

Prior to commencing work, make sure all

method statements, risk assessments and

permits are in place.

Decide on the safe lowering method by which

the components shall be removed to the

ground, for example hand to hand, crane, hoist,

forklift truck or hand-line.

Lowering of equipment/components outside the

frame of the Stair Tower should be avoided as

this may affect stability.

Under no circumstances should ‘bombing’ be used to lower equipment.

Once the components are safely on the

ground they should be stacked neatly ready

for transportation.

Removing all guardrails and any ‘topped

out’ standards as you go, move progressively

towards the stair flight. Components should

then be lowered to ground level.

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Step 7

Step 8

BASIC DISMANTLING PROCEDURE

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Unhook the stair flight, remove and lower

to ground level.

Step 9

Unsecure the thumblocks of the ledger beams.

Remove all four ledger beams progressively and

lower to ground level.

If any element of this dismantling sequence

cannot be complied with please seek advice.

At ground level, work progressively towards the

final stage landing and entrance step. Remove

ledger beams and purlin rails / purlin frames

whilst holding standards so that they do not

become unstable.

Remove the standards from the base jacks

when they are no longer attached.

Repeat steps 5 to 12 dismantling and lowering

the components in the sequence described.

Note: Ties should only be removed when

they prevent further dismantling.

From erection platform / stage landing remove

the upper level stage landing and lower to

ground level.

Step 10

Step 11 Step 14

Step 12

Step 13

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Fig 1 Advanced Guardrail Device

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Installing guardrails and handrails in advance of erection platforms or stage landings helps prevent falls or injury during the erection process.

Guardrails can be fitted in this way by utilising the TRAD Stair Tower Advanced Guardrail device (Fig 1).

To be able to fit guardrails in advance of the erection platform the Stair Tower must be constructed commencing the first lift with 1m standards. Steps 1 to 7 of the standard erection sequence are to be followed. The 3m standard is then fitted to the 1m standard prior to fitting ledger beams and single tube ledger beams.

1m standards and 3m standards can be secured by nut/bolt to ensure uniformity of the direction of pockets.

At this point, with the erector standing safely on the erection platform or stage landing, the guardrail for the next lift can be installed with the aid of the TRAD Stair Tower Advanced Guardrail device (Fig 2).

Always ensure that the guardrails are securely located in the pockets of the standard (Fig 3).

TRAD STAIR TOWER ADVANCED GUARDRAIL SYSTEM

Fig 2 Fig 3

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Standard tube (EN39 Standard) and fittings

(EN74 Standard) are used to form the tie

connection in conjunction with a proprietary

tie system. Appropriate length tubes are to be

fitted to both the standards of the TRAD Stair

Tower structure.

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The TRAD Stair Tower must be anchored to

the adjacent structure.

The tower should be tied to this structure

at each lift (i.e. 2m vertical centres) using

horizontal ties at each side that securely fix

to the existing structure and to the inner

and outer standards.

Where the shorter 1.6m face of the tower

is constructed parallel to the existing

structure, additional ties are required.

These ties should be applied at each lift

from the outer standards at 45 degrees

back to the existing structure. These

additional ties are to be securely fixed

to the existing structure and this fixing

is assumed to be capable of resisting

horizontal forces both parallel and

perpendicular to the plane of the wall.

In accordance with the requirements of BS EN12811 the design load for the TRAD Stair Tower is 1 kN/m2, or 1.5 kN positioned in worst-case position for element of tower under inspection.

All access scaffolds will impose forces upon the structure to which they are fixed through their ties. There should be an initial assessment with regards to the ability of the structure to sustain the loads either globally, due to its own instability, or locally as a result of defective finishes.

Loadings from the ties into the supporting structure are dependant upon the live loading to the working platforms, the height of the scaffold and, in the majority of cases, the wind loading imposed upon the scaffold and its cladding status. For guidance with regards to the design of ties into building facades we would refer you to Section 5 of TG20:08 or to the TRAD Hire & Sales Ltd Technical Services Department or a competent temporary works designer.

ANCHORAGE & TYING-IN

LOAD DATA

Tie Connections

In addition to masonry anchors, box ties,

through ties or girder couplers may also be used

to ensure the stability of the TRAD Stair Tower

System (where suggested configurations cannot

be used, qualified design input must be sought).

Throughout the calculations for the maximum design load on any standard for the TRAD Stair Tower has been taken as 45.24 kN where the 3m face is parallel to the structure and 29.07 kN where the short (1.6m) face is parallel to the structure based upon the use of ledger beams to both long and short faces of the tower at every landing location.

25


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PERSONNEL CAPACITIES

The Personnel Capacities tables are designed to provide guidance on the recommended number of personnel permitted on the TRAD Stair Tower by the height of the tower.

This table is limited to a maximum area load of 3 kN/m2, for practical reasons.

For the purposes of this table one person is assumed to weigh 100kg, exerting a force of approximately 1kN and no wind loadings are taken onto this Stair Tower.

TRAD STAIR TOWER

Stair Tower Height Max No. Personnel

2m

4m

6m

8m 28

10m 35

12m 40

14m 47

16m 53

18m 59

20m 65

22m 70

24m 66

26m 65

28m 61

30m 60

32m 56

34m 55

36m 51

38m 50

40m 46

42m 45

44m 41

46m 40

48m 36

50m 35

26

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OM

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TS


SAFE W

OR

KIN

G H

EIGH

TS

The TRAD Stair Tower Safe Height tables

are based on a maximum height of 30m,

heights above this are possible but

these should be referred to a competent

temporary works engineer.

This TRAD Stair Tower User Guide utilises

wind loading in the preparation of its

safe working height tables for access

scaffold. These tables are limited to “S”

values above 20 and below 40. Where

localised conditions result in “S” values

outside of these parameters the wind

velocity pressures may either be lower

than or exceed those utilised within the

calculations from which the tables are

derived. Scaffolds located to the edges of

cliffs or escarpments, in coastal locations

or to tall structures surrounded by other

tall structures, which may cause funnelling

of the wind pressure, are all susceptible

to significant increases in wind pressure

due to local effects. In these instances it is

recommended that advice is sought from

a competent temporary works engineer.

SAFE WORKING HEIGHTS

For the purposes of this guide the Stair Tower is assumed to be unclad and free from netting and sheeting, such that the only area presented to the wind is that of the components of the Stair Tower.

The safe height tables and section capacities contained within this TRAD Stair Tower User Guide are based upon live loading from the intended use only. Additional loading may accrue on the working platforms or components as a consequence of atmospheric precipitations such as ice, snow, sand and dust. The working processes may also cause debris such as sand, grit or demolition debris to accumulate on the working platforms or components, which will also increase the live loading above that allowed for. Where this is seen to occur or is known will occur further guidance should be sought from a competent temporary works engineer, which may result in a downgrading of the load class of the scaffold.

Any site that is at least 2km inside a town

terrain, shielded by buildings within 100m and

where the average height of the surrounding

buildings are 5m or more then this site is

classified as a ‘Town’ site.

Any site that falls outside the scope of

the description of the ‘Town’ site.

Town Sites Country Sites

Note: Procedures and guidance for determining maximum safe heights

are available in TG20:08 Volume 1.

27


SAFE W

OR

KIN

G H

EIGH

TS

MAXIMUM HEIGHT TABLES – TRAD STAIR TOWER

3.0m (Long) Face Parallel to Building

Maximum Tower Height (m)

SValue to be ascertained

subject to siteIn Country In Town

20 30 30

24 30 30

28 14 14

32 6 8

36 – 4

40 – –

Derived from Out of Service Condition – Critical up to 30m

1.6m (Short) Face Parallel to Building

Maximum Tower Height (m)

SValue to be ascertained

subject to siteIn Country In Town

20 30 30

24 30 30

28 30 30

32 30 30

36 28 28

40 18 18

Derived from Out of Service Condition – Critical up to 30m

28


OTHER PRODUCTS

OTH

ER P

RO

DU

CTS

NASC Code of Practice compliant

BS EN 12810 / BS EN 12811 compliant

CISRS recognised System Scaffolding product.

TRADLok Scaffolding System1

Tools & Tool Holders2

Steel Bins5Harnesses & Lanyard3

Post Pallets4

29


OTH

ER P

RO

DU

CTS

Tags & Signs6

Sign Board Frames7

Galvanised Tubes BS EN 399

Alloy Beams11Tube End Protectors8

Scaffold Fittings BS EN 7410

30

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w.t

rad

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ean

dsa

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co.u

k

Head Office TRAD Hire & Sales Ltd TRAD House Cromwell Road Bredbury Stockport SK6 2RF Tel: 0161 494 2999 Fax: 0161 494 2991

Glasgow DepotTRAD Hire & Sales ( Scotland ) LtdTRAD Wharf244 Bernard StreetGlasgow G40 3NXTel: 0141 550 3666Fax: 0141 550 3777

Leeds DepotTRAD Hire & Sales ( Northern ) LtdTRAD House, Unit 1b 16 Cross Green Way Cross Green Industrial Estate, Leeds LS9 0SETel: 0113 249 9555Fax: 0113 249 4555

London DepotTRAD Hire & Sales LtdRenwick RoadBarkingEssex IG11 0SBTel: 020 8517 1212Fax: 020 8517 1213

Birmingham DepotTRAD Hire & Sales ( Midlands ) LtdTRAD HouseBrickhouse Lane West Bromwich West Midlands B70 0DYTel: 0121 522 2333 Fax: 0121 522 2335

Stockport DepotTRAD Hire & Sales LtdTRAD HouseCromwell RoadBredburyStockport SK6 2RFTel: 0161 430 4666Fax: 0161 430 4777

Andover Depot TRAD Hire & Sales Ltd58 Whittle Road West Portway Industrial Estate, Andover Hampshire SP10 3FB Tel: 0126 435 0505 Fax: 0126 435 0515

ISO 9001: 2008REGISTERED FIRM

3D Images provided by www.aximo.co.uk Edition 1. Published February 2012

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