Chapter 5 (Formwork)

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5.3 FORMWORK

A number of activities involve in the formwork operations are: -

fabricating erecting

stripping

moving

cleaning

oiling

In the pricing of the forms all the above activities and the materials involved are allowed.It is the surface area of the concrete, that is the contact area that will be measured. At

the time of take-off, the design of the forms does not have to be concerned since only

the area of formwork is measured, thus, the formwork shall be measured in square metre

of contact area. For narrow strips of formwork, that in less than .! metre wide is

normally measured in linear metre. It should be noted that the bulkheads i.e. where wall

is to be continued shall be measured separately. Also the forms to slab edges are

measured separately from forms to beams and forms to walls.

If in a form system there is an opening, and if the si"e of the opening is less than one

square metre, therefore no deduction is made from the total area of the forms.

#rooves, chases, chamfers in formwork that are linear in nature are measured in linear

metre.

Forms to circular column are measured in linear metre to the height of the column and

are described by giving the diameter of the column.

$ % &


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5.4 WORKED EXAMPLES

Example 5.4.1 Slab

'ased on drawing as shown in Figure $.(.&, calculate the amount of formwork required

)prepare taking off sheet* and bill of for the slab.

Figure 5.4.1 : Si e Ele!a"i#$ a$ Pla$ %ie& #' Slab

$ % +


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A' /A01 2FF 311/

SLA(

awn timber of awn timber of !4 mm thickness !4mm thicknessfor side of slab For soffit of slab

+% (..+$ +. m + ength )5*6(.

ess )-* column+%) .(%+* 6 .(

+% !.$ !.7.+$ &.8$ m +

ength )9*6!.$ess )-* column

+%) .&4%+* 6

.&4&% !.7 !.!+!.!+ &&. ! m +

A' - 'I 2F ;


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Example 5.4. S2uare #lum$

'ased on drawing as shown in Figure $.(.+ and Figure $.(.+a, calculate the amount of formwork required for $ nos. of square column. >repare taking off sheet and bill of for the

vertical column and sloped column.

Figure 5.4. : Si e Ele!a"i#$ O' %er"i,al #lum$

Figure 5.4. a : Si e Ele!a"i#$ O' #lum$ A" A$ A$gle

?2 erimeter of column loping distance

+% .( 6 .4 in+$ 6 (%h+% .&4 6 .!7 h 6 (% in+$

&.&7 6 .$m$%+% .$

$% &.&7 .( !4.(. +!.+ m +

$%+% .$.&4 &8.&

$$.& m +

?2


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/otal 'ill RMExample 5.4.3 (eam

'ased on drawing as shown in Figure $.(.!, calculate the amount of formwork required,thus prepare taking off sheet and bill of for the beam. /he column is + B+ mm.

Figure 5.4.3 : Si e Ele!a"i#$ A$ Pla$ %ie& O' (eam

$ % $


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KJC 326

'1A@ /A01 2FF 311/

(EAM

awn timber of awn timber of !4 mm thickness !4 mm thicknessto outer sides of to outer sides ofbeam &%A-' and beam A%&-+ and+%A-' '%&-+

ength 6(.$ ength 6(. Add ) * column Add ) * column

+%) .+%+* 6 .+ +%) .+%+* 6 .++% (.8 (.8 +% (.+ (.+

.!$ !.+ m + .!$ +. ( m +

awn timber of awn timber of !4 mm thickness !4 mm thicknessto inner sides of to inner sides ofbeam &%A-' and beam A%&-+ and+%A-' '%&-+

ength 6(.$ ength 6(.ess )-* column ess )-* column

+%) .+%+*6 .+ +%) .+%+*6 .++% (.! (.! +% !.4 !.4

.!$ !. & m + .!$ +.77 m +

awn timber of awn timber of !4 mm thickness !4 mm thicknessto soffit of beam to soffit of beam&%A-' and +%A-' A%&-+ and '%&-+

+% (.! +% !.4.+ &.8+ m + .+ &.$+ m +

!.+!. &&.8++. (+.77&.$+

&$.&(

'1A@ - 'I 2F ;


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Example 5.4.4 F#u$ a"i#$

'ased on drawing as shown in Figure $.(.( and Figure $.(.(a, calculate the amount of

formwork required for the foundations, prepare taking off sheet and bill.

Figure 5.4.4 : Si e Ele!a"i#$ O' F#u$ a"i#$

Figure 5.4.4.a : Pla$ %ie& O' F#u$ a"i#$

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Chapter 5 (Formwork)

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