CEL 774 CONSTRUCTION PRACTISES

Concrete: Production
(Form work )

B. Bhattacharjee
CIVIL ENGINEERING DEPARTMENT
IIT DELHI

DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI
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General Outline
•
•
•
•

Definitions
Mass Concrete
Cold weather problem
Concreting in cold w eather

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Definitions: Form work

Complete
system
of temporary
structure built to contain fresh
concrete so as to form it to the
required shape and dimensions and to
support it until it hardens sufficiently
to become self-supporting. Formwork
includes the surface in contact with the
concrete and all necessary supporting
structure.
B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

3

Definitions
Mould A frame for casting, precast
concrete units
Scaffold (Scaffolding)
A temporary structure for gaining access to
higher levels of the permanent structure
during construction

Centering (Centering)

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Definitions
Centering (Centering)
It is a temporary supporting structure
to a soffit. It is the specialized
formwork used in the construction of
arches, shells space structure where the
entire false-work is (struck or decentred) as a unit to avoid introducing
injurious stress in any part of structure .
B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Definitions
Falsework

(a) Falsework is the temporary structure
erected to support work in the process of
construction . It is composed of shores,
formwork for beams or slabs (or both) and
lateral bracing.
(b) That part of formwork, which upports
the forms usually for a long structure,
such as a bridge.
B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Definitions
Form (Shutter)

(a) That part of formwork, which consists
of the sheeting and its immediate
supporting or stiffening members.
(b) A temporary structure or mould for
the support of concrete while it is setting
and gaining sufficient strength to be selfsupporting.
B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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GOOD FORMWORK
l HOW

FORMWORK CAN BE ERECTED AND
DE-SHUTTERED FAST.
l HOW
GOOD CONCRETE QUALITY AND
SURFACE FINISH CAN BE ACHIEVED.
l WHAT IS THE OPTIMUM STOCK OF
FORMWORK REQUIRED FOR THE SIZE OF
WORK FORCE, THE SPECIFIED TIME
SCHEDULE AND FLOW OF MATERIALS.
l HOW SAFETY CAN BE IMPROVED FOR
THE SITE PERSONNEL.
B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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GOOD FORMWORK
l WHAT

IS

THE

OVERALL

COST

SAVINGS THAT CAN BE ACHIEVED
USING

THE

RIGHT

TYPE

OF

FORMWORK

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

9

Safety
–ENSURED IF,
• COMPONENTS ARE LIGHT IN WEIGHT FOR
HANDLING AND PLACING
• LOOSE OR HANGING COMPONENTS ARE
MINIMAL
• MINIMUM OPERATIONS ARE INVOLVED
DURING EACH REPETITION
• INDIVIDUAL COMPONENTS ARE SELF
STANDING
• LESS MAKING IS INVOLVED AT SITE
•

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Safety
• SYSTEMS FACILITATES FIXING AND
REMOVAL AT EACH LOCATION
–WITHOUT
THE
USE
OF
ANY
SOPHISTICATED TOOLS AND TACKLES
• SYSTEM HAS PROVISION FOR FIXING
WORKING / CONTROL
–PLATFORMS.

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Wall form

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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BEAM

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Columns

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Stud walls

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Slabs

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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Slabs

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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ECONOMY
–During design and sizing of members
–Economy is all about achieving number of repetition
–Choose the size that gives maximum repetition
–Preferable to have same size of column and beam
throughout
–Symmetric and standardization

–Economy in making, erecting, and stripping
forms
–Economy in formwork and overall economy

B. Bhattacharjee
DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI

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THANK YOU FOR
HEARING

DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI
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