construction safety - part 5 (fall-scaffolds)

7/27/2019 Construction Safety - Part 5 (Fall-scaffolds)

1/22


2/22

What Is A Scaffold?An elevated, temporary work

platform

Three basic types:

Supported scaffolds -- platforms

supported by poles, legs, frames,

& outriggers

Suspended scaffolds -- platforms

suspended by ropes or overhead

support

Aerial Lifts -- such as cherry

pickers or boom trucks


3/22

Hazards

Falls from elevation caused byslipping, unsafe access, and the

lack of fall protection Struck by falling tools / debris

Electrocution from overheadpower lines

Scaffold collapse Bad planking giving way

Employees working on scaffolds are

exposed to these hazards:


4/22

Supported Scaffold

Requirements:

Proper scaffold access

Keep scaffold free from

debris Place scaffold legs on

firm footing

Provide guardrails


5/22

Supported Scaffold

The height to base

ratio should not be

more than four (4)unless guys, ties, or

braces are used6 m

1.5 m


6/22

Suspended Scaffolds

Train employees to recognize

hazards

Secure/tie to prevent swaying

Personal Fall Arrest System

(PFAS) must anchor

independently of the scaffoldsupport system

Ropes capable of supporting 6

times the load


7/22

Employees cant be on amoving scaffold unless:

Surface is level Height to base ratio is 2 Outriggers are installed

on both sides of scaffolds

Moving Scaffolds


8/22

Scaffolds must

be erected,

moved,

dismantled oraltered under

the supervision

of a competent

person.

Competent Person


9/22


10/22

Falls are the leading cause of deaths in the

construction industry.

Falls from as little as 1.5 to 2 m can cause

serious accidents and even death, so must

be protected.

Falls in Construction


11/22

Personal Fall

Arrest System

(PFAS)

Guardrails Safety Net

Fall Protection Options


12/22

PFAS in place before work starts

PFAS in use

Fall Protection Planning


13/22

Must be

independent of

any platformanchorage, able

to support 1140

kg per worker

Safety Line Anchorages


14/22

Top rails about 90 cm tall

Toeboards at least 15 cm high

Top Rail

Mid- Rail

Toeboard

Guardrails


15/22

Place as close as possible, but not more

than 7.5 m below employees working.

Safety Nets


16/22

Unprotected edge

Fall Protection Needed

Unprotected sides must haveguardrails or equivalent


17/22


This 1/4" nylon rope alone is not a properway to guard this open floor


18/22

Cover completely and securely

If no cover, guard with a guardrail


Floor Holes

Improperly

Covered


19/22

When working on formwork or rebar

cover or cap protruding rebar


Concrete Forms and Rebar


20/22

Barricade or fenceexcavations 2 m or

more deep


Excavations


21/22

If you work on roofs, you must be protected


Roofs


22/22

Good Work Practice

Perform work at ground level asmuch as possible

Example: building prefab roofs onthe ground and lifting into placewith a crane

construction safety - part 5 (fall-scaffolds)

Documents