QSB 2134 - Estimating

CHAPTER 6 - EXCAVATION

Example 3 (Tutorial/ Seminar 1)

Calculate the cost required to excavate and backfill 4 pits for the following pad footing in sand

using hand.

Pad footing size 500mm x 500mm x 250mm

Column size 250mm x 250mm

250mm

Data:

a) Type of Excavation

Excavation

OutputBackfill Output

hour / m3 hour / m3

Oversite <250mm 1.25 - 1.50 0.50

Basement 2.00 - 2.25 1.00

Trenches 2.00 - 2.75 1.00

Pits 3.00 - 4.50 1.00

Reduce level 1.75 - 2.00 1.00

b) Labour rate 8hrs day

Skilled labour RM50

Unskilled labour RM40

* Skilled labour is required for excavation exceeding 3.00m

c) Additional 25% of time required to excavate and backfill in sand

d) Allow 10% for compaction in sand.

e) Allow 10% profit and 5% overhead.

f) Also calculate the unit rate (RM/m3) for excavation including backfilling.

by Azrina Md Yaakob Page 1 of 1