of on t cti en du m tro ure In as rks e M ng Wo di uil B k 4 ee W y erall n s Ge ntitie a g Qu surin Mea
O bje ctiv e s Upon chap compl e ter, y t ou wion of t hi Defi ill be s pr ocne the q able u ant ess to: it y y t ak Desc eo ff co m ribe ho p ose w t ak d eoff i Disc tems are r equ uss t he l e vel ire d for a o Calc tak e f ac cura cy off a nd i ulate t he rreg u a l ar p rea of re Calc lane g v arieu late t he shap ular es ty of volu solid m Gi ve fig ur e of a b ui ld n the di es ing p m ens cen t e rl in lan, ca ions of pe rim e lc a eter len gth o u la te th e trenc ft h/foo he ting s/wa ll
T he Q uan t ity Tak e o ff Proc e w or k ss of m ea surin g S er ies i tem of q uan tif ied s w ork Desi ign i s bro k Ite ms en d o wn are m a cco easu rdin g t o r red ules Stan d ard fo easie r eva r mat en a l uati o bles M et h n o be sh d of me a su re ar ed men t ca n
Wha t Is M ea su red? Take - are m-of f : wo rk qu easu antit Not m red ies a ter i al qu Q uan antit ti ty t ies est im akeo ate f f for cost Mea su in pl re men ts ar a ce” e ma P rov de “ i des net i nfor suf fi ma ti o ci en t pric n I nclu i ng des i inv ol ve m t ems tha t at eri als don ’t
Un its Me a s ure m o f en t Two s Am e ystems i n No rican rth cons Engl t ruct ish s i on ys te em Me tr ic sy s tem Esti mat o rs ar work e ad entir vi sed syst ely i to em n on e Mixin prob g incre a ses abili t y of erro r
Ite m U nits Basic ca teg o ries Num : ber L eng th Area Volu me W eig ht
T ak e of f R u les Take o off i t Dime em comp onen ns ion s t s: Desc fine the s iz e or qu r iptio a nt it y ns Clas s ifies the i To b e te m e f lexi b ef fect ive , pre ility serv While e e ke epi ng eff ic ienc y i n m pricing and i nd
Ac cu ra cy Me a s ure m o f en t Quan tit y t a k eof Shou f ld accu amo r ate l unt o f wo r y refle c Leve t k l of a ccur p urs acy ued Dep e n bene ds on co f s acc u its of atta ts and racy ini ng h igh Extr a ju st if t ime may i ed n ot b e Must be b ala nc ed
Org a niza tion of th e Tak e o ff Gene rally of w o rk a c follows s eque ti viti Cont nce es rac t dra pr es wi ng ente s usu d in Mea all y th is s su equ e ex ca re c onc r nce v ati o ete Begin on w b o rk o efor e r n mea wi th ex c sure m en av ation Ass e t emb li es: co ns com ide re d sep ponen t Disti ar ate ngu i ly ished divi d af ed i n to p a ter proj e ct is rts
Figure 1: Taking-Off Sheet/Traditional Dimension Paper Figure 2 : Billing Paper
Formulas/Perimeter Centerline Calculations Figure 3 Perimeters and Areas of Plane Shapes
Figure 4: Volumes of Solid Figures
Relationship between shapes and building measurement
Example 1 Measure the volume of concrete in an irregularly shaped floor The surface area of the floor would naturally divide into three rectangles. If the thickness of the floor was 150 mm (0. 15 m), then, Volume of concrete = (5 x 0. 15) + (3 x 2. 5 x 0. 15) + (7 x 4 x 0. 15) m = 13. 28 m 3 Setting out the above figures on a dimension sheet will be as follows:
Example 2 : Measure the area of external wall ( Length) ( (W 1) ( (D 1) ( Height) 2 8. 00 225 mm thick hollow sand 3. 00 24. 00 concrete block wall in c. m (1: 4) Ddt: 1. 20 W 1 0. 90 2. 16 0. 90 D 1 2. 10 1. 89 19. 95 Setting out the above figures on a dimension sheet will be as follows:
Figure 5 : Plan and Section of Wall
Figure 6 : Plan of Corner of Wall
Figure 7 Plan of Exterior/Interior Corner
Example 3 : Measure the centerline of perimeter wall Simple rectangular plan shape
Take-off quantities for perimeter external wall by using Traditional Dimension Paper as shown in Figure 8 Plan and Perimeter Calculation of Wall
Exercise Part 1: Calculate Perimeter of External Walls A. B.
C. D.
Part 2 : Measure the following items and transfer to dimension paper appropriately: a) Measurement of Area
b) Measurement of Volume
Quan S um m a ry ti ty t Proc akeoff es wor k ss of mea surin of a p g roje c In th t e qu an for m of a t ifi ed l work ist of Unifo it em rm r s ules Cont a no te ined in “ s” mea s urin g Orde r of Follo ta keoff w sequ s co nstr u ct io en ce n