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2/14/12 Types of Formwork | Concrete Formwork Contractors | CFC Scaffolding 1/3 cfcscaffolding.co.za/«/types-of-formwork-concrete-formwork-contractors/ In January of 1984 Colin Poole and Jerry West went into partnership with the establishment of Cape Formwork Contractors or CFC. Their goal was to take on the highly competitive scaffolding and formwork market in Cape Tow Read more Types Of Formwork – Concrete Formwork Contractors Formwork is a complex technique involved in construction which requires specialist contractors for proper use. It¶s the term given to specific moulds or receptacles into which concrete is poured to make slabs for construction or actual components of buildings. Once the concrete has hardened to an adequate level, the forms are removed. This is known as µstripping¶. There are many different types of formwork which are used in building, for many different purposes. There are three main materials for creating formwork – traditional timber formwork, engineered formwork (usually a metal frame) and stay-in-place formwork systems (usually pre-made concrete systems). Using these types of formwork, there are a variety of different ways to create slabs and structures from formwork. How It Works Roman engineers began using slab formwork to complete major constructions which used concrete. The engineers built their constructions using arches and domes because concrete does not have a strong resistance to stress. Concrete only became a popular material with which to build once reinforced concrete was invented. Different Types of Formwork Traditional slab formwork uses timber, masonry and carpentry to complete construction. The method works through tree trunks or other lumber supporting rows of stringers which are placed three to six feet or one to two meters apart with joints placed between the stringers. Metal beam slab formwork is much the same as the traditional slab formwork method, the only difference being that steel is used instead of timber and metal props are used instead of supports. This system is reusable and more methodical than the traditional method. The finish of the concrete is smoother and the formwork is easier to remove after the cement has cured. Modular slab formwork is created from pre-made timber modules or modules made from steel or aluminium. These are usually produced in a factory offsite and added to construction once completed. LATEST NEWS 20 December 2011 Standing the test of time 28 February 2011 Budget In A Nutshell 03 February 2011 SA set for economic recover 27 January 2011 CFC Scaffolding sponsorship Zip Zap cause

Types of Formwork _ Concrete Formwork Contractors _ CFC Scaffolding

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Page 1: Types of Formwork _ Concrete Formwork Contractors _ CFC Scaffolding

2/14/12 Types of Formwork | Concrete Formwork Contractors | CFC Scaffolding

1/3cfcscaffolding.co.za/…/types-of-formwork-concrete-formwork-contractors/

In January of 1984 Colin Poole and Jerry West went into

partnership with the establishment of Cape Formwork

Contractors or CFC. Their goal was to take on the highly

competitive scaffolding and formwork market in Cape Town...

Read more

Types Of Formwork – Concrete FormworkContractors

Formwork is a complex technique involved in construction which requires specialist

contractors for proper use. It’s the term given to specific moulds or receptacles into

which concrete is poured to make slabs for construction or actual components of

buildings. Once the concrete has hardened to an adequate level, the forms are

removed. This is known as ‘stripping’.

There are many different types of formwork which are used in building, for many

different purposes. There are three main materials for creating formwork – traditional

timber formwork, engineered formwork (usually a metal frame) and stay-in-place

formwork systems (usually pre-made concrete systems). Using these types of formwork,

there are a variety of different ways to create slabs and structures from formwork.

How It Works

Roman engineers began using slab formwork to complete major constructions which

used concrete. The engineers built their constructions using arches and domes

because concrete does not have a strong resistance to stress. Concrete only became

a popular material with which to build once reinforced concrete was invented.

Different Types of Formwork

Traditional slab formwork uses timber, masonry and carpentry to complete

construction. The method works through tree trunks or other lumber supporting rows of

stringers which are placed three to six feet or one to two meters apart with joints placed

between the stringers.

Metal beam slab formwork is much the same as the traditional slab formwork method,

the only difference being that steel is used instead of timber and metal props are used

instead of supports. This system is reusable and more methodical than the traditional

method. The finish of the concrete is smoother and the formwork is easier to remove

after the cement has cured.

Modular slab formwork is created from pre-made timber modules or modules made from

steel or aluminium. These are usually produced in a factory offsite and added to

construction once completed.

LATEST NEWS

20 December 2011

Standing the test of time

28 February 2011

Budget In A Nutshell

03 February 2011

SA set for economic recovery

27 January 2011

CFC Scaffolding sponsorship to help

Zip Zap cause

Page 2: Types of Formwork _ Concrete Formwork Contractors _ CFC Scaffolding

2/14/12 Types of Formwork | Concrete Formwork Contractors | CFC Scaffolding

2/3cfcscaffolding.co.za/…/types-of-formwork-concrete-formwork-contractors/

How to Choose a Contractor »« Scaffold Hire In Cape Town:

The Table or Flying Form System

Another type of formwork is table or flying form systems. These consist of slab

formwork tables which are reusable. These tables do not have to be dismantled and

can be used in high buildings where cranes or elevators are used to lift the tables.

Once the table is positioned, the space between the wall and table is filled. Tables vary

in size from eight square meters to 150 square meters. This type of formwork is a huge

saver of both labour and time and is a favourite of construction engineers and

architects. However, table formwork is best used in the construction of large, but simple

structures.

Because the system is easily dismantled into single parts, it is transportable. The

system is built in the same way as beam formwork, apart from these single parts. Joists

and stringers are screwed, bolted or welded to become a deck.

Formwork should be placed at the correct height so that there is sufficient space to

remove them once the concrete has set or cured. Due to this reason, the support

systems of table formwork need to be height adjustable. Adjustable metal props can be

used to support the systems. Some use steel or aluminium to insert stringers and

supports into the systems, while others use metal frame shoring towers to attach the

decks to. Others attach the decks to walls or columns that have been pre-cast which

means that contractors do not need to use vertical props, simply support shoes bolted

through holes.

Crane Lifting for Table Formwork

Tables produced which are five to seven meters wide with a potential length of over

100 feet are lifted by crane. The decks and formwork are moved to the edge of the

building once the concrete has been cured and the crane lifts the protruding edge

upwards, the rest of the formwork follows.

The advantages to crane-handled flying formwork include lowered labour costs and a

more methodological way of functioning. However, lifting of this nature requires

extremely advanced cranes to function, which can be expensive.

Elevator or Crane Fork Lifting for Table Formwork

When smaller tables are produced, such as those that are two to three meters in width

and four to seven meters long, these are lifted by crane transport fork or material

platform elevators which are attached to the side of the building.

Shifting trolleys are used to transport the tables horizontally to the elevator or crane

platform. Crane fork flying formwork is used mostly in the US and Europe and other

countries where labour costs are high as this technique is labour reducing, therefore

cost reducing. Smaller tables can be customised to suit buildings of a more complex

design. The disadvantage of this type of formworking is the cost of raw materials and

cranes.

Formwork should always be undertaken by a professional contractor who is

experienced and certified in their knowledge and services. Because formwork involves

concrete which is heavily affected by a number of stresses, the incorrect use can be

dangerous as the concrete may collapse. Formwork has however allowed people to

build structures never before dreamed possible and paves the way for future

construction.

About the Author:

Cape Formwork Contractors (CFC) are approved formwork contractors in Cape Town

who use up-to-date formwork techniques and systems to keep their services at an

outstanding, yet cost effective level.

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Construction Scaffolding

T (021) 535 1124-8, E [email protected]

20 Kinghall Avenue, Epping

Cape Town, South Africa

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