a presentation on scaffolding

8/3/2019 A Presentation on Scaffolding

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A PRESENTATION ON

SCAFFOLDING

By:

Tushar Tyagi(42)

B.Tech I.F.E

Semester - III
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DEFINITION Scaffolding is a temporary structure used to support

people and material in the construction or repair ofbuildings and other large structures. It is usually amodular system of metal pipes or tubes, although it

can be from other materials.

A temporary frame usually constructed from steel oraluminium alloy tubes clipped or coupled together

to provide a means of access to high-level workingareas as well as providing a safe platform fromwhich to work.


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SCAFFOLDINGINTHE ANCIENT WORLD

The Berlin Foundry Cupdepicts scaffolding inancient Greece (early 5thcentury BC).

The ancient Egyptiansand Chinese are alsorecorded as having usedscaffolding-like structuresto build tall buildings.

The ancient Africanshave also used woodenscaffoldings to supportmosques.


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FUNCTIONS As a safe working

platform so that theworker can do the worksafely and easily.

As a platform for placingmaterial and logisticsneeded by the workersto carry out their job.

As a walking passageused by the workers totransport the materialsand logistics.
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FACTORSNEEDEDTOBECONSIDEREDFORTHEDESIGNINGOFSCAFFOLDS

It should be easy to erect.

It should be strong enough to support itself and tosupport the weight of the materials and the workers.

It should be light weight so that it is easy to erect,dismantle and transport for further use.

It should follow all the safety standards to ensurethe safety of the workers.

It should provide adequate passage connecting toother areas.


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MATERIAL

Scaffolds can be made of the following

materials:

Tubular Steel

Tubular Aluminium Alloy

Timber


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STEEL SCAFFOLD Steel tubes are nearly 3

times heavier thanaluminium alloy tubes butare far stronger.

Longer span can be used

since its deflection isapproximately 1/3 ofaluminium alloy tubes.

There are 2 types of steeltubes used:

- Galvanized steel tubes- Ungalvanized steel tubes

that need special care(painting, varnishing or oilbath after use)


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ALUMINIUM SCAFFOLD Aluminium is lighter than

steel hence it is easier tocarry and erect.

It needs protective

treatment when it is to beused in contact withmaterials such as damplime, wet cement and seawater to preventcorrosion.

In such a case the tubesare coated with bitumasticpaint before using them.


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TIMBER SCAFFOLD

It is extensively used indeveloping countries.

The members arelashed together usingropes or wires instead ofthe coupling fittingsused in the metalscaffolds.


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SCAFFOLD ELEMENTS

Standards

Ledger

Transom

Double Coupler Swivel Coupler

Putlog Coupler

Base Plate

Split Joint Pin

Reveal Pin

Putlog End


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TRANSOMS

BASE PLATE

DOUBLECOUPLER

STANDARD

LEDGERS


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Double Coupler- The only real load bearing fitting used in

scaffolding

- Used to join ledgers to standards

Swivel Coupler

- Composed of 2 single coupler rivetedtogether so that it is possible to rotate themand use them for connecting 2 scaffold tubesat any angle.

Putlog Coupler- Used solely for fixing transoms to thehorizontal ledgers.


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Base Plate

- It is used to distribute the load from the

foot of a standard on to a sole plate or firmground.

Split Joint Pin

- A connection fitting used to join scaffoldtubes end to end.

- A centre bolt expands the 2 segments thatgrip on the bore of the tubes

Reveal Pin

- Fits into the end of a tube to form anadjustable strut


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BASICFORMSOF SCAFFOLDS

There are two basic forms of scaffolds:

Putlog Scaffold

- Single row of uprights / standards setoutside the perimeter of the building.- It is partly supported by the structure

Independent Scaffold- It has 2 rows of standards that are tied bycross members called transoms.


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PUTLOG SCAFFOLD

It consists of a single rowof uprights or standards setaway from the wall at adistance that willaccommodate the requiredwidth of the working

platform. The standards are joined

together with horizontalmembers called ledgers.

The ledgers are tied to thebuilding with cross

members calledtransoms. It is erected as the building

rises & mostly used forbuildings of traditional brickconstruction.

Putlog Scaffold tied into thebrickwork using transoms


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INDEPENDENT SCAFFOLD

This scaffold has 2 rowsof standards that aretoed by cross memberscalled transoms.

This scaffold doesntrely upon the building forsupport.

Suitable for use in

conjunction with framedstructures.

Independent Scaffold


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SAFETY PRECAUTIONS Standard must be on the same level and vertically

straight on the base plate.

The supporting platform wood must be supported

properly.

Working platform must be equipped with safetyelements such as hand rail.

Scaffold must be inspected at certain times.

Use of safety tools such as safety boots, safetyhelmet, etc when using platform.


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THANKYOU

a presentation on scaffolding

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