Part 1 - Scaffolding Terminologies
HAZARDOUS AREA CLASSIFICATION PART 4
Scaffolding operation in any
industry is considered as highly technical operations with serious hazard
potential. Unless correct steps are taken, a loss prevention program at work
site, it may end up with serious trouble with loss in job schedule, injury to workmen,
company image and damage to property. Hence, to perform the job safely,
knowledge on scaffolding , safe erection and maintenance & inspection are
essential to the execution team.
The scaffolding is having many
types like roof scaffolding, hanging scaffold, suspended scaffolding, mobile
scaffold platform, rolling scaffold, aluminium scaffolding, mobile aluminium
scaffold, U Jack scaffolding, portable scaffold tower etc.
Scaffold Terminologies
Anchorage : Safe points of
anchorage for lifelines or lanyards, which are part of a personal fall arrest
system, including fixed, substantial structural members. Anchorage points shall
be fixed and able to support a load of at least 2,300 kilograms (5,000 pounds).
Base Plate : A steel plate
providing a flat bearing surface with a spigot or screwjack for distributing
the load from posts (standards). It has an integral spigot and fixing holes for
use with sills.
Bearer (Transom) :A horizontal
transverse scaffold member, that may support platform units, and which is supported
by at least two runners (ledgers) or connected directly to at least two posts
(standards).
Board Bearer (Intermediate Transom)
: A horizontal transverse scaffold tube upon which the scaffold platform
partially rests. Board bearers are supported by runners (ledgers) and are not
installed near a transverse line of posts (standards).
Brace : A rigid connection of
scaffold tubing that holds one scaffold member in a fixed position with respect
to another member to give the scaffold rigidity.
Cross Bracing : Two diagonal braces
joined at their center to form an “X.” Also called “X” bracing or cross braces.
Diagonal Brace : A scaffold tube
placed diagonally with respect to the vertical and horizontal members of a
scaffold and fixed to them to give the scaffold stability.
Longitudinal (Facade or Sway)
Bracing : Diagonal braces installed in the plane of the longer dimension
(length) of the scaffold.
Plan Bracing : Diagonal braces
installed in a horizontal plane, particularly used in mobile and tower
scaffolds.
Transverse (Sectional or Ledger)
Bracing : Diagonal braces installed in the plane of the shorter dimension
(width) of the scaffold.
Zig-Zag (Dog-leg) Bracing :
Diagonal braces placed end-to-end and that alternate back and forth.
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