SCAFFOLDING

DEFINITION

• “A temporary structure from which persons can gain access to a place in order to carry out building operation”

• “ A temporary frame usually constructed from steel or aluminium alloy tubes clipped or coupled together to provide a means of access to high-level working areas as well as providing as a safe platform from which to work.”

FUNCTION

As a working platform

- so that the worker can stand on the platform

do the work easily & safely As a platform for placing material & logistic

needed by the workers to carry out their job As a platform and walking passage

- scaffolding support the platform that been

used by the worker as their walking path to

transport the material & logistic

2 Basic forms of scaffolding are as follows:

a) Putlog Scaffold- Single row of uprights / standards set

outside the perimeter of the building.- It’s a partly supported by the structure

b) Independent Scaffolds- It have 2 rows of standards that are tied

by cross members called transoms.

Among the factors need to be considered

during the design process of scaffold are as

follows:

a) Easier to be erected

b) Strong

c) Light / Not heavy

d) Safe

e) Suitable

f) Passage Link / Passage connecting to other places

Scaffold can be made of the following

material:

a) Tubular steel

b) Tubular aluminium alloy

c) Timber

STEEL SCAFFOLD

Steel tubes are nearly 3 times heavier than aluminium alloy tubes but are far stronger.

Longer span can be used since it deflection is

approximately 1/3 of aluminium alloy tubes. There 2 types that is:

- Galvanized steel tubes

- Ungalvanized steel tubes that need special

care (painting, varnishing or oil bath after use)

Steel Scaffolding

ALUMINIUM SCAFFOLDS

Need protective treatment when they are to

be used in contact with materials such as

damp line, wet cement & sea water to

prevent corrosion to the tubes. Coating the tube with bitumastic paint

before using it would be a suitable

protective treatment.

Aluminium Scaffolding

                                                    

TIMBER SCAFFOLD

Extensively used in the developing country Members are lashed together with wire or

rope instead of the coupling fittings used

with metal scaffolds.

Timber Scaffold

Bamboo Scaffolding (In Hong Kong)

Bamboo Scaffolding

SCAFFOLD ELEMENTS

a) Standards / “Tiang”

b) Ledger / “belebas”

c) Transom / “Pepat”

d) Double Coupler / “Pengganding Berkembar”

e) Swivel Coupler / “Pengganding Swivel”

f) Putlog Coupler / “Pengganding Putlog”

g) Base Plate /

h) Split Joint Pin

i) Reveal Pin

j) Putlog End

BASE PLATE

DOUBLE COUPLER

STANDARD

STANDARD

a) Double Coupler - the only real loadbearing fitting used in scaffolding - used to join ledgers to standardsb) Swivel Coupler - Composed of 2 single coupler riveted together so that it is possible to rotate them & use them for connecting 2 scaffold tubes at any angle.c) Putlog Coupler - use solely for fixing putlogs/transoms to the horizontal ledgers.

d) Base Plate

- It is used to distribute the load from the foot of

a standard on to a sole plate or firm ground.

e) Split Joint Pin

- A connection fitting used to joint scaffold tubes

end to end.

- A centre bolt expands the 2 segments that grip

on the bore of the tubes

f) Reveal Pin

- Fits into the end of a tube to form an adjustable

strut

g) Putlog End

- A flat plate that fits on the end of a

scaffold tube to convert it into a putlog

Putlog Coupler

Double Coupler

Swivel Coupler

Base Plate For Scaffold

PUTLOG SCAFFOLDS It consists of a single row of uprights or standards set away from the wall at a distance that will accommodate the required width of the working platform. The standards are joined together with horizontal members called “ledgers” The ledgers are tied to the building with cross members called putlog. It is erected as the building rises & mostly used for buildings of traditional brick construction

Putlog Scaffold tied into the brickwork using putlogs or tubes with putlog adaptors

INDEPENDENT SCAFFOLD

This scaffold has 2 rows of standards that

are toed by cross members called transoms. This scaffold doesn’t rely upon the

building

for support Suitable for use in conjunction with framed

structures.

Independent Scaffold

OTHER TYPES OF SCAFFOLD

Besides pulog scaffold & independent scaffold

there are other such as:

a) Slung Scaffold

b) Truss-Out Scaffold

c) Suspended Scaffolds

d) Mobile Tower Scaffold

e) Birdcage Scaffolds

f) Gantries

MOBILE TOWER SCAFFOLD

The mobile scaffold would have small tyres

under the standards. Designed to be easily moved Commonly used for things such as painting

and plastering, where workers must frequently

change position. Used mainly by painters & maintenance to

gain access to ceilings.

• Mobile Tower Scaffold

Mobile Scaffold

Suspended Scaffold

It is platform that is suspended by rope or other non-rigid means, from an overhead structure

There are many types of suspended scaffolds such two point (swing stage), multipoint adjustable, catenary and others.

Two Point (Swing Stage) is hung by ropesor cable connected to stirrups at each end

of the platform. It is used by window washers or skyscrapers

Two Point (Swing Stage)

SAFETY PRECAUTION

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 been equipped with safety elements such as hand rail. Scaffold must be inspected at certain times. Use safety tools such as safety boots, safety helmet and etc when using platform.

Supervision of scaffold erection & progress

/safety reports are undertaken by a suitable

experience & qualified person that normally occurs:

a) within the preceding 7 days

b) after adverse weather conditions that may

have affected the scaffold’s strength or

stability

c) whenever alterations / additions are made to the scaffold

The report made after inspection must consist : Location & description of scaffold Date of inspection Result of inspection, statin the condition of scaffold Signature & office of the person making the inspection Badly assembled & neglected scaffold have been a significant contributory factor to the high accident rate associated with the construction industry.