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ScaffoldsTypes, Terminology,
Design and Operation
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Terminology
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Scaffolds
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4 New-Scaf
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“Scaffolds can be very
dangerous place to work, I f they are not
erected proper ly ”
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Provision of Scaffold and
Means of Access
• Suitable and sufficient scaffold shall be
provided for all work that cannot safely be
done from the ground or from part of the
building, or from part of a permanentstructure or from a ladder or other
available means of support, and sufficient
safe means of access shall as far asreasonably practicable, be provided to
every place at which any person has at
any time to work.
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Scaffold
• Any temporarily provided structure on or from
which building workers perform work inconnection with building or other construction
work
• Any temporarily provided structure whichenables building workers to obtain access to
or which enable materials to be taken to any
place at which such work is performed.
• Includes any working platform, gangway, run,
ladder or step-ladder together with any
guardrail, tow board or other safeguards and
all fixings.
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• Standard means a member used as avertical support or column in theconstruction of scaffolds which transmits aload to the ground or to the solid
construction.• Transom means a member placed
horizontally and used to tie transversely
one ledger to another, or one standard toanother in an independent tie scaffold.
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• Ledger means a member spanninghorizontally and tying scaffolding
longitudinally and which acts as a support
for putlogs or transom.• Putlog means a horizontal member on
which the board, plank or decking of a
working platform are laid.
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• Frame or modular scaffold means ascaffold manufactured in such a way thatthe geometry of the scaffold ispredetermined and the relative spacing of the principal members are fixed
• Bay in relation to scaffolds, means thatportion of the scaffold between horizontalor vertical supports whether standards or supports from which the portion issuspended, which are adjacentlongitudinally.
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Top Rail
Mid- Rail
Toeboard
Toe board - 150mm wide
Mid Rail / Knee Rail-0.52mtr
Hand Rail/ Top Rail- 1.2mtr
Rule 196 Guardrails
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• Guardrail means a horizontal rail secured
to uprights and erected along the exposed
sides of scaffolds, floor openings, runways
and gangways to prevent persons from afalling.
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Independent scaffold
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• Independent ties scaffold means a
scaffold, the working platform of which is
supported from the base by two or more
rows of standards and which apart fromthe necessary ties stands completely free
of the building.
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RIGHT-ANGLE COUPLER- Carbon
steel f i tting with high tensile bolts,
connection at Rt. Angle , designed
SWL capacity 635Kgs
Right angle
coupler
means a
coupler,
other than a
swivel or
putlogcoupler,
used for
connecting
tubes at rightangles.
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• Sole plate means a member used todistribute the load from the base plate or the standard of wooden scaffolds to thesupporting surface.
• Base plate means a plate for distributingthe load from a standard in the case of metal scaffolds.
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• Sound or good construction means
construction conforming to the relevant
national standards or in case such national
standards do not exist, to other generallyaccepted international engineering
standards or code of practices.
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• Sound or good material means materials
of a quality conforming to the relevantnational standards or in case such national
standards do not exist, to other generally
accepted international engineeringstandards or code of practices.
• Tubular scaffold means a scaffold
constructed from tubes and couplers.
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Rule
191(a)
Standard : Vertical tube , 40mm Dia
conform to IS-1161-1963
Joint Pin or Spr ing lock Pin
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Suspendedscaffold means a
scaffoldsuspended by
means of ropesor chains and
capable of beingraised or lowered
but does not
include aboatswain’s chair
or similar appearance.
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Brace means a member incorporated
diagonally in a scaffold for stability
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• Trestle scaffold includes a scaffold in
which the supports for the platform are anyof the following which are self-supporting,
namely_
– Split heads – Folding
– Step-ladder
– Tripods; or
– Moveable contrivances similar to any of
the foregoing
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Trestle Scaffold
