HSE-BMS-018 Scaffolding Safety.......ppt

2
Objectives
To give a better awareness and understanding of the
regulations concerning;
 The suitability of materials used to construction
scaffolds.
 The manner in which these materials should be
erected to form the more common types of scaffolds.
 The correct construction of boarded out platforms,
handrails and ladder access common to all scaffolds.

3
Hazards
• Falls from elevation –
caused by slipping, unsafe
access, the lack of fall
protection and bad planking
(giving way)
• Struck by falling tools /
debris
• Electrocution – from
overhead power lines
• Scaffold collapse - caused
by instability or overloading
Employees working on scaffolds
are exposed to these hazards:

4
Fall Hazards
• While climbing on or off
the scaffold
• Working on unguarded
scaffold platforms
• When scaffold platforms
or planks fail
• While ascending or
descending in a ladder
Falls may occur:

5
What is a Scaffold?
 A scaffold is a temporary structure which provides
access from which persons may work.
 It can also be used to support materials or
equipment.
 A scaffold is a safe working platform.

6
Types of Scaffold
 Scaffolding consisting of two rows
or more of standards connected
together longitudinally with ledgers
and braces and transversely with
transoms or putlogs.
 Stationary scaffolds can be built-up
as high as the job requirements
dictate. The vertical members must
be kept plumb and straight to avoid
eccentric loading and possible
collapse. Rigid bracing, usually a
combination of horizontal and
diagonal bracing, is required to
prevent swaying and displacement.
The footing or anchorage for
scaffolds must be sound, rigid, and
capable of carrying the maximum
intended load without settlement or
displacement.
STATIONARY SCAFFOLD

7
Types of Scaffolds
Mobile Scaffold
 A mobile scaffold usually has
four standards one at each
corner.
 These can be placed on the
ground and wheels (caster) are
used, so that the scaffold can be
moved.
 Mobile scaffolds are similar to
Stationary scaffolds except that
they are wheel mounted. The
maximum height of a mobile
scaffold must not exceed four
times the smallest dimension of
its base.

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Mobile/Stationary Towers
Indoor
 Stationary Tower - 4.0 times the SBD (Smallest
Base Dimension)
 Mobile Tower - 3.5 times the SBD
Outdoor
 Stationary Tower - 3.5 times the SBD
 Mobile Tower - 3.0 times the SBD

10
Indoor Mobile Scaffold
Indoor Mobile Scaffold:
This Mobile system
scaffold was erected
and needing rakes to
add stability

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Types of Couplers
 Base Plate
 Right Angle Coupler
 Putlog Coupler
 Swivel Coupler
 Spigot Coupler
 Sleeve Coupler
 Girder Coupler
 Wheels (casters)
 Sometimes called scaffold
fittings.
 These have been
designed and tested to BS.
5973 (British Standards)
Specifications.
 Because some of them is
load bearing components,
most fittings achieve a
SWL (Safe Working Load).
Scaffold Couplers

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Base Plate
 This is a metal plate with
a peg in the middle used
under the standards.
 Used for distributing and
spreading the load from
the standard to the
scaffolds foundation.
 In some cases, a screw
jack is attached to
maintain the levelling of
the platform if is erected
in unlevelled ground

13
Right Angle Coupler
 Right angle coupler are
also known as a Double
Coupler.
 Used to connect ledgers to
the standards.
 They have been designed
and tested to achieve a
right angle connection with
a maximum safe working
load of 630KG

14
Putlog Coupler
 Also called Clips and single
clamp.
 Used to connect the transoms
to the ledgers
 These fittings are only suitable
for light duty use only.
 This putlog coupler is not a
load bearing fitting.

15
Swivel Coupler
 Swivel couplers are used to
connect two tubes at any
angle through 360 degrees.
 Normally use to connect the
bracing to the scaffold.
 The swivel coupler should
never be used as a right
angle coupler.
 This fitting is a load bearing
coupler with an SWL of
550kg.

16
Spigot Coupler
 Also known as a joint pin.
 This fitting is used to connect
two tubes together in
longitudinal (end to end) and in
vertical position.
 This fitting is placed inside the
two ends of the tubes.
 This fitting should never be used
in positions where it will be
subject to bending or tension.

17
Sleeve Coupler
 The sleeve coupler is used in
the same way as the spigot
coupler, but this time used on
the outside of the tube.
 This fitting has a resistance to
bending, at least equal to any
tube.
 It has a safe working tension
load of 315Kg.

18
Girder Coupler
 Girder Coupler or commonly
know as Beam clamp. This
coupler is used to connect the
scaffolding pipe in to the beam.
 This fitting should always used
in pairs to prevent movement.
 It has a safe working tension
load of 315Kg if use in pairs.

19
Wheels (Caster)
 Wheels (casters) are used on
towers allowing them to be
moved.
 Wheels (casters) have two (2)
locking systems.
 One to connect the wheel to
the standard.
 One to lock the wheel in
place to stop it moving.

20
Foundations
 The soil or ground beneath the sole board should be well
compacted and free from irregularities, which could make
the sole board unstable or poorly bedded.
 On slopes exceeding 1:10 a check may have to be made
on the foundations to ensure the stability of the scaffold.
 The ground must be capable of supporting the scaffold.
 The sole boards must be capable of spreading the weight
of the structure without distortion.
 Two standards per sole board are better than one.
 Sole boards should be placed at right angles to the
building and should not project too far out beyond the
scaffold.
 Sole boards should not be undermined.

21
Foundations
This diagram shows
how the scaffold
foundations should be
corrected. Note that
the cross braces have
been added to transfer
loading away from the
base of those
standards, which are
near the trench

22
Thermal Block
Trench
BAD PRACTICE
Foundations

23
Standard
A vertical or near vertical tube based on the ground or a
structure. Used to carry the ledgers.
1.6
2.0
Heavy Duty Scaffold
1.8
2.1
General Purpose
Scaffold
2.0
2.4
Light Duty Scaffold
2.2
2.7
Very light Duty
Scaffold
Daewoo Materials
(meters)
BS spacing (meters)
Standard spacing
Scaffold use

25
Ledger
 A longitudinal tube fixed
parallel to the face of the
building.
 It also act as a support
for the transoms.
 It can also be use to
form part of the ties in
the scaffold.

26
Transoms
 A tube spanning across the
two ledgers to form support
for the boards. It is
sometimes called as the
board bearers
 Maximum spacing between
each transom is 1.5 metres.
When a 38mm board is used.
 A minimum of four transoms
to a 3.9 meter board.

27
Transoms
3.9m
1.5m
Intermediate
Transoms
Main Transoms

28
Brace
 A tube placed
diagonally with
respect to the vertical
or the horizontal
members of a scaffold
and fixed to them to
afford stability.
 The best angle for
setting the brace is 45
degrees.

29
Working Platform
 Two Boards wide -
Access Only
 Three Boards wide -
For men without tools
 Four Boards wide- For
men with tools
All scaffold boards should comply with BS 2482; and
should not be warped, twisted, split or badly worn,
painted or otherwise treated so as to conceal any defects.

30
Boarded Lifts
 The spacing of transoms for the boarded lifts is
limited by the thickness of boards used.
 While boards are available which are manufactured
to BS 2482, the majority boards used on scaffolding
will conform to NASC Technical guidance Note
TG5:91 (Scaffold Board Specification).
 38mm boards made to TG5:91 standard should be
supported at a maximum span of 1.2 meters
whereas, when a BS board is employed, a maximum
span of 1.5 meters may be used.

31
Boarded Lifts
Maximum spacing for
putlogs or transoms
when using boards
conforming to BS 2482
3.5 meter
63mm
2.6 meter
50mm
1.5 meter
38mm
1.0 meter
32mm
Maximum
span of
transom
Nominal
Thickness of
board

32
Guard-rails
 Guard-rails must be provided:
 Where persons are liable to
fall 2 meters or more
 At a level at least 910mm
above the level of the
platform
 At the height approximately
halfway between the top
edge of the toe-board and the
top or subsequent guard-rail,
so that no gap is larger than
470mm
 And fixed inside the
standards

33
Handrails, Mid-rails
Guardrail(Handrail)
Guardrail(Mid rail)

34
Toeboards
Toe-boards must be provided:
 Toe boards must be fitted to all
scaffolds to prevent persons and
materials falling from the scaffold.
It must be installed in all sides of
the scaffold platform except in
access point
 To accompany guard-rails
 At least 150mm high above the
platform (they are usually made
by scaffold board turned on edge)
 And fixed inside the standard
with the use of proper clips

35
Ladder access
Ladders used as access to the workplace should be:
 Not defective in any way nor painted
 Placed on a firm footing, with each stile equally supported
 So positioned that there is sufficient space at each rung to give
an adequate foothold
 Positioned approximately at an angle of 75º, that is: 1 measure
horizontal to 4 measures vertical
 When more than 3 meters in length it must be securely tied at
the top or footed at the bottom to prevent slipping
 Extended to a height of 1 meter (5 rungs) above the working
platform (unless there is another adequate hand hold)
 Positioned so that vertical height of the ladder running between
landing does not exceed 9 meters
 When moving or placing a ladder, be aware of overhead power
lines and other electrical hazards

37
Ladder Inspection
 All ladders must be inspected
prior to use.
 Things to look out for.
 Check to see if the ladder is
damaged.
 Check the stills (sides) for cracks
or splits.
 Check the rungs are all in place
and the
 supporting rods are under the
rungs.

38
Access
 Working platforms must
be provided, where
necessary with access
holes, which must not
be more than 500mm
wide, and as small as
practicable in the other
direction.
 Landing must be fitted
with guard-rails and
toe-boards, and no
materials should be
stored.

39
System Scaffolds
Common Types Of System
Scaffold
 Most systems are composed
of standards with performed
connectors welded at
intervals along their length to
which the ledgers are fitted
with a proprietary clamping
or wedging arrangement.
 Some earlier systems use
tubes made into frames –
typically H or X shapes, to
avoid the need for bracing.

40
System Scaffolds
Ring Type Cuplock System Star System

42
Scaffold Inspection
Scaffolding platform must be inspected;
 By Competent Scaffolding Inspector
 Before being use for the first time
 After any substantial addition, dismantling or other
alteration
 After any event likely to have affected its strength or
stability
 At regular intervals not exceeding 7 days since the
last inspection
 Using scaffolding checklist and must have report of
inspection
 Handing over certificate shall be given to requestor

46
Scaffold Tagging System
(SCAFFTAG)
The Scaffolding Inspector shall place a weather proof
plasticated or equivalent colour coded label (SCAFFTAG) at
each access point and at the boundary of each scaffold section
from the initial erection stage until final dismantling.
• Date erected, with name and initials of Scaffolding Foreman/
Supervisor
• Maximum loading kN/m2.
• Date inspected, with foreman name and Scaffolding
Supervisor’s signature.
which shall clearly state if the scaffold is “READY FOR USE” or
“NOT TO BE USED”. In addition the label shall state:

47
Scaffolding Tagging System
Red Scafftag
This means that the
scaffold platform is
unsafe and must not be
used by anybody
except by certified
scaffolder only for the
purpose of rectifying or
dismantling

48
Yellow Scafftag
 When this scafftag is
showing it means that
the scaffold is under
inspection.
 It is recommended that
the scaffold should not
be use when this tag is
posted.

49
Green Scafftag
When this scafftag is
shown it means that the
scaffold is safe to use.

50
 Personal fall protection system, a system used to
arrest an employee in a fall from working levels. It
consists of an anchorage point, connectors, a full
body harness, a shock absorbing lanyard and may
include a deceleration device, lifeline or suitable
combinations of any of these.
 Anybody who will be working in scaffolding platform
1.8 meters and above must wear and use it properly.
Fall Protection

57
 Use appropriate scaffold construction methods
– Erect, move, or alter scaffold properly
– Protect from falling objects or tools
 Ensure stable access
 Use a competent person
– Train on scaffold construction and the hazards involved
with scaffolds
– Inspect scaffold before each shift and after alterations
– Determine fall protection requirements
Remember to:
Summary

58
 Look after yourself
 Look after the people around you
The fall won’t hurt,
but the sudden stop will !

HSE-BMS-018 Scaffolding Safety.......ppt

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HSE-BMS-018 Scaffolding Safety.......ppt