Part 2 - Scaffolding Terminologies

 


Part 2 - Scaffolding Terminologies


Part 2 - Scaffolding Terminologies








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

 

Caster (Castor) : A pivoting wheel, containing a wheel lock, which is attached to a vertical post (standard) of a mobile scaffold to allow for manual movement of the scaffold.

 

Coupler (Fitting, Clamp) ; A component or device used to fix scaffold tubes together.

Types of couplers include:

 

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Adjustable (Swivel) Coupler : A device used for connecting two tubes together at an angle other than 90 .

 

Bearer (Single or Putlog) Coupler : A device used for fixing a bearer (transom or putlog) to a runner (ledger), or to connect a tube used only as a guardrail to a post (standard).

 

Check (Safety) Coupler : A Right-angle coupler added to a loaded joint on an underhung scaffold to give supplementary security against slip to the coupler carrying the load.

 

End-to-End (Sleeve) Coupler : A device used for externally joining two scaffold tubes co-axially end to end. The steel divider is located centrally to ensure equal insertion of each tube.

 

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Girder Coupler : A device used for connecting a scaffold tube to a steel wide flange beam (I-beam). Girder couplers shall only be used in pairs, one on each opposite flange.

 

Load Rating : Live load for scaffold design and maximum intended loading shall be per the following categories:

 

Light-duty : Scaffold designed and constructed to carry the weight of workmen only, with no material storage other than the weight of tools. Commonly used for inspection, painting, access and light cleaning. Uniformly distributed maximum intended load is 120 kg/m2 (1.2 kN/m2).

 

Medium-duty: Scaffold designed and constructed to carry the weight of light materials, tools and workmen. Scaffolds used for abrasive blast cleaning (“sandblasting”) shall be classified Medium-duty if there is potential for buildup of abrasive on the platforms (all platforms are not continuously cleaned of abrasive). Uniformly distributed maximum intended load is 240 kg/m2 (2.4 kN/m2).

 

Special-duty: Scaffold specially designed and constructed to carry maximum intended loads greater than 240 kg/m2 (2.4 kN/m2) (50 psf), such as masonry work, piping or equipment, and is classified as a Special Scaffold.

 

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