INTRODUCTION TO SCAFFOLDING INSPECTION FOR HSE STAFF
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Transcript of INTRODUCTION TO SCAFFOLDING INSPECTION FOR HSE STAFF
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INTRODUCTION TO
SCAFFOLDING INSPECTION
FOR HSE STAFF
Mark Stephens FIIRSM FInstLM FISQEMA
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Disclaimer
• This training presentation does not qualify you to become
a Scaffold Inspector
• This presentation is purely for awareness training only
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Definition
• Scaffold:
• 1. a temporary or movable platform or structure for holding workers and materials working high above the floor or ground during the erection, repair, decoration or demolition of a structure.
• 2. an elevated platform or structure on which criminals are killed by being hanged or beheaded
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Definition
• Falsework:
• consists of temporary structures used in construction to support spanning or arched structures in order to hold the component in place until its construction is sufficiently advanced to support itself.
• Falsework also includes temporary support structures for formwork used to mold concrete to form a desired shape, and shoring which is temporary structural reinforcement used during repairs.
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Definition
• Formwork: • is the term given to either
temporary or permanent
molds into which concrete or
similar materials are poured.
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Rule #1 - don’t mix the three
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Statistics
On average, 78 fatalities a year in
USA (2000 – 2010)
In a Bureau of Labor and Statistics (BLS)
study, 72% of workers injured in scaffold
accidents attributed the accident either to
the planking or support giving way, or to
the employee slipping or being struck by
a falling object.
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70%
12%
18%
Facts – Scaffolding fatality study
Falls
Collapse
Electro-cution
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Typical Middle East Scenario
• Project Manager:
“You’re the HSE Manager – it’s your job to sign-off the scaffolding”
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Only a (scaffold) competent person can erect, modify, move, maintain, inspect or dismantle scaffolding, or if being trained, is being supervised by a (scaffold) competent person.
Competency
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Inspection: Structural Engineer Scaffold Inspector (3 day) Scaffold Supervisor (3 day)(6 months experience at level 3)
Erection, modification, moving, maintaining, or dismantling : Level 3 (5 day) (6 months experience at level 2)
Level 2 (5 day) (6 months experience at level 1)
Level 1 (5 day)
Trainee laborer/apprentice (1 day)
Overseas Competent Persons (Scaffolds)
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All scaffolds over 10m long, over 8m in height, hung, cantilever or suspended scaffolds must be designed by a qualified, professional structural engineer. All calculations and the design drawing(s) must be included in an Appendix of the Health & Safety Construction Plan, that can be extracted and used as a Scaffolding Plan. Once erected, designed scaffolds must be approved and signed off by the structural engineer as being built to the design.
Overseas Competent Persons (Scaffolds)
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Occupational Health Standards
All workers during the orientation/ induction process shall be required
to complete a health assessment questionnaire, which shall be kept
on file within the site first aid facility.
Questions within the health assessment questionnaire shall be based
on typical construction work activities that will encountered on the
project , examples are, but not limited to:
Are you taking any medication which may affect your capacity to
do your job safely?
Do you suffer from vertigo?
Overseas Competent Persons (Scaffolds)
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Types - System
Prefabricated and all components are predesigned to fit in specific places. Fast but lacking in flexibility.
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Types – Open Tube & Coupler/Clamp
• Allows for greater flexibility of design, but compared to a system scaffold, it is a bit slower to erect and requires competency
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Types – Timber / Bamboo
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Typical Middle East Scenario
• Project Manager:
“You’re the HSE Manager – it’s your job to sign-off the scaffolding”
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Where do I start?
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Scaffolding Hazards
Where do I start?
Falls from Height
Incomplete working platforms
Incomplete cover of openings (floor & wall)
Insufficient sized working platform
Use of equipment to gain extra height
Incomplete/Insufficient access
Poor Housekeeping (Slips & trips)
Failure to wear PPE (PFAS) where required
Falling Objects
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Scaffolding Hazards
Where do I start? Structural Collapse
Incorrect set-up
Anchorages
Poor quality materials
Unstable footings
4:1 ratio
Movement
Gravity
Overloading
Weather
Damaged material
Electrocution
Overhead Power Lines
Temporary Electrical equipment (poor grounding/earthing)
Lightning
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Risk Profile
Where do I start?
What’s going to hit the headlines?
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Rule #2 – Stop it falling over
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Gravity
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Structural Collapse
All scaffolds must be prevented
from collapsing or tipping by
secure attachment to the
bearing surface or to another
structure by the means of the
following methods:
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Structural Collapse
Reveal Tie
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Structural Collapse
Box Tie
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Structural Collapse
Through Tie (2-way tie)
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Structural Collapse
Lip Tie
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Structural Collapse
Cast-in
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Structural Collapse
Drilled-in
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Structural Collapse
Tie Safety Criteria
Lowest level of ties at the lift
closest to the height of 4 times the
minimum base dimension (4:1
ratio).
Highest level of ties as close to the
top of the scaffold as possible.
Spaced vertically every 8 meters (4
lifts) or less.
Installed at both ends of the
scaffold and at horizontal intervals
no more than 9 meters measured
from one end toward the other.
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Structural Collapse
Rakers
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Structural Collapse
Outriggers
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Structural Collapse
Cross Tube Anchor
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Structural Collapse
Driven Tube & Wire Anchor
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Gravity
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Gravity
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Structural Collapse
Bracing
BEARER (TRANSOM)POST (STANDARD)
TRANSVERSE (SECTIONAL) "ZIG-ZAG" BRACING
TUBE & COUPLER SCAFFOLD
4th LIFT
3rd LIFT
2nd LIFT
1st LIFT
Base Lift35o-55o
(TYP.)
MAX. 3OPEN BAYS
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Structural Collapse
Bracing
RUNNER (LEDGER)
POST (STANDARD)
LONGITUDINAL (FAÇADE) "ZIG-ZAG" BRACING
TUBE & COUPLER SCAFFOLD
3rd LIFT
2nd LIFT
1st LIFT
Base Lift35o-55o
(TYP.)
BRACING REPEATED EVERY
5th POST (STANDARD)
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Structural Collapse
Footings
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Structural Collapse
Footings
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Structural Collapse
Footings
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Structural Collapse
Weather
"Sheeted Scaffolds" or scaffolds that have nets or tarpaulins attached to them must
have specific calculations and design conducted by a structural engineer to address
the issue of "wind-sail" on the complete structure.
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Structural Collapse
Weather
In windy conditions, manufacturer's instructions must be adhered to; usually at
17mph all work should cease on mobile towers.
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Structural Collapse
Overloading
Each scaffold and scaffold component must support without failure its own
weight and at least four times the maximum intended load applied or transmitted
to it.
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Structural Collapse
Correct Connections
Couplers should be free from worn threads or damaged bolts and excess oil
which reduces friction grip.
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Structural Collapse
Correct Connections
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Structural Collapse
Serviceable material
Tubes should not be split, cracked, rusty, bent or distorted, and ends should be
cut square and clean.
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Structural Collapse
Serviceable material
Scaffold boards must be a minimum of 1,500 lb-f/in2 construction grade
lumber, fitted with end hoop irons for protection.
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Structural Collapse
Movement
No attempt should be made to
move tall, fully-erected towers. The
tower must be reduced to a safe
height appropriate to the ground
conditions. Normally as guidance,
the height should not exceed 2 1/2
times the minimum base
dimension.
.
No persons or materials must be
on the tower during movement.
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Rule #3 – stop someone from falling off
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Falls from Height
Incomplete Working Platform
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Falls from Height
Working Platform Overhangs
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Falls from Height
Working area size
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Falls from Height
Gaining extra height
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Falls from Height
Housekeeping
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Rule #4 – stop someone from falling through
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Falls from Height
Floor Openings
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Falls from Height
Gaps between Scaffold & Structure
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Falls from Height
Gaps between Working Platform boards
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Falls from Height
Rebar Caps
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Access
Ladders
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Access
Ramps
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Rule #5 – stop tools & materials falling off
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Falling Objects
Fans
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Falling Objects
Sheeting
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Falling Objects
Netting
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Falling Objects
Waste Chutes
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Scaffolding Contractors
Handover Certificates
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Electrical Safety
Overhead Power Lines
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Electrical Safety
Temporary Electrical Safety
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Inspections
Visible Records
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Summary
Rules
1. Never mix scaffolding/formwork/falsework 2. Stop the scaffolding falling over 3. Stop someone falling off 4. Stop someone falling through 5. Stop tools & materials falling off
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INTRODUCTION TO
SCAFFOLDING INSPECTION
Any Questions ?