FORMWORK (CE152P)

7/23/2019 FORMWORK (CE152P)

1/27

FORMWORKBy: Charles Kendrick Cardenas


2/27

DEFINITION

It is a temporary structure used to contain poureconcrete and to mould it to the required dimenssupport until it is able to support itself.

It is a mould or box into which workable concretepoured and compacted so that it will ow and n

to the required prole of the mould itself. It also acts as a temporary structure that suppor

Its on weiht

Concrete poured

!i"e loads durin construction process


3/27

REQUIREMENTS OF GOODFORMWORK#. It should be stron enouh to withstand all types of dead and li"e loads.

$. It should be riidly constructed and e%ciently propped and braced both hori&on"ertically' so as to retain its shape.

(. )he *oints in the formwork should be tiht aainst leakae of cement rout.

+. Construction of formwork should permit remo"al of "arious parts in desired seqwithout damae to the concrete.

,. )he material of the formwork should be cheap' easily a"ailable and should be sreuse.

-. )he formwork should be set accurately to the desired line and le"els should ha"surface.

. It should be as liht as possible.

/. )he material of the formwork should not warp or et distorted when exposed toelements.

0. It should rest on rm base.


4/27

TYPES OF FORMWORKS

123456)I24 1278927K 96!! 1278927K

CI!I4; 1278927K

B68 1278927K

C2!384 1278927K


5/27

FOUNDATION FORMWORK

Can be desined in "arious ways' normally desisocket foundations' and formwork for strip found

)he type of desin is dictated by the si&e' mainlyheiht of the foundation formwork.

4ormally sheetin panels with formwork bearers

form of wall clamps are used for foundation form)ie wires as well as metal screws are used as for

ties.


6/27

WALL FORMWORK

Consists of "ertical arraned upriht timbers refabricated sheetin panels may also be used

of sheetin boards.

Cleanin holes are to be pro"ided at the foot of tformwork.


7/27

CEILING FORMWORK

)he type of formwork mostly found instructures?buildins.

)he formwork sheetin may consist of sheetin or prefabricated sheetin panels.

)he formwork sheetin lies on squared timber fo

bearers which are arraned on main bearers carthe forces to round timber columns.

5iaonal board bracins are pro"ided to take uphori&ontally actin forces.


8/27

BEAM FORMWORK

Aas prefabricated formwork sheetin parts


9/27

COLUMN FORMWORK

)he sheetin of column formworks are prefabricated accordcolumn dimensions from sheetin boards connected by co"

)he sheetin panels are placed in a foot rim which is anchosoil by steel bolts.

)he foot rim consists of doublenailed boards.

9hen the sheetin panels ha"e been inserted in the foot rim

arch timbers are placed to take up the forces from the co"ethe formwork sheetin.

6round the arch timbers' column clamps of at steel are clawith wedes or a rim of boards is arraned similar to the foo

)he distances of the clamps are normally approximately


10/27

86)7I6!D 3D5:

)imber Dteel

6luminum

;lass 7einforced >lastic


11/27

TIMBER

Advantages

asy to handle due to its weiht

asy to disassemble

Eery exible

>arts can be easily replaced

3seful for small scale pro*ects

!ess in cost

Disadvantages

6bsorbs water from concrete that result

8oisture content of timber will a@ect the f

It is also hard to place shorin


12/27

STEEL

Advantages

Eery strin and able to carry hea"y loads

asy to x

3niformity in si&e and surface nish

Can be used for a lon time

Eery riid

asy to dismantle

Disadvantages

!imited si&e

x

6 "ery smooth surface will be produced

to nishin beams and columns but dis

9eiht also adds to trans


13/27

GLASS REINFORCED PLASTIC

Advantages

Eery useful in complex shapes

asy to disassemble

!ihtweiht

5amaes are easily repaired

Disdavantages

7equires m

4ot used world wide due to p


14/27

BOARD AND STEEL

Advantages

asy to use

7eusable for se"eral times

1lexible

3seable in any type of form or shape

!ess shorin used

Disadvantages

In hih rise towers used polyboard

Dystems on cuttin the board for


15/27

Installation: 1oundation

Dheet >iles on foundations "icinity xca"ation and arthworks

Bored >iles

7ebars

1ormworks

Dhorins

Concrete >ourin

$/ days curin


16/27

Installation: Columns

7einforced bars Dplicin

Dtirrups

)ies

1ormworks

Dide Dhorins $# days before remo"in forms

Columns can be chamfered on a trianularshape.


17/27

Installation: Beams


Dtirrups

)ies

1ormworks

Dide Dhorins +/ F $ hours side forms can be remo"ed

$/ days support shorin can be remo"ed

Beams are usually formed with the slab.


18/27

Installation: Dlabs


)ies

1ormworks

)able 1orms usually

1ull Dhorins at lower le"el days before some shorin can be remo"ed

$/ days support shorin can be remo"ed

Dlabs are usually formed with the beams


19/27

1ailures

Improper strippin and shore remo"al. Inadequate bracin

Eibration

3nstable soil under mudsills

Inadequate control of concrete pourin

!ack of attention to formwork details


20/27

>ictures


21/27

>ictures


22/27

>ictures


23/27

)imber


24/27

>ictures


25/27

Dteel


26/27

;lass 7einforced >lastic


27/27

Board G Dteel

FORMWORK (CE152P)

Documents

Transcript of FORMWORK (CE152P)