FORMWORK (CE152P)
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Transcript of FORMWORK (CE152P)
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FORMWORKBy: Charles Kendrick Cardenas
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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
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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.
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TYPES OF FORMWORKS
123456)I24 1278927K 96!! 1278927K
CI!I4; 1278927K
B68 1278927K
C2!384 1278927K
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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.
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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.
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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.
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BEAM FORMWORK
Aas prefabricated formwork sheetin parts
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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
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86)7I6!D 3D5:
)imber Dteel
6luminum
;lass 7einforced >lastic
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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
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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
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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
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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
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Installation: 1oundation
Dheet >iles on foundations "icinity xca"ation and arthworks
Bored >iles
7ebars
1ormworks
Dhorins
Concrete >ourin
$/ days curin
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Installation: Columns
7einforced bars Dplicin
Dtirrups
)ies
1ormworks
Dide Dhorins $# days before remo"in forms
Columns can be chamfered on a trianularshape.
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Installation: Beams
7einforced bars Dplicin
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.
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Installation: Dlabs
7einforced bars Dplicin
)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
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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
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>ictures
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>ictures
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>ictures
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)imber
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>ictures
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Dteel
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;lass 7einforced >lastic
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Board G Dteel