A Study of Lean Construction Practices in Gaza Strip

Then, the processes with the greatest impact on the project duration are identified and
shown in Table (4.35).
Calculated of the value added percent is as follows:
V.A. Percent=Value added / Total duration
Value added according the appendix (c)=1906.15 hours
V.A.Percent of the form work the ground floor column = 1906.15 / 2835.5 = 67%.
V.A.Percent of the form work the first floor column = 1906.15 / 2841.8 = 67%.
V.A.Percent of the form work the foundation = 1906.15 / 2869.7 = 66%.
No. Process
Table 4.35 Greatest duration of waste in activity
Non value added
Total
duration
(hours)
V.A
Percent
(%)
1 Ground floor column Form work concrete 2835.5 67%
2 First floor column Form work concrete 2841.8 67%
Foundation Form work concrete
3 2869.7 66%
In case of putting “0” for the three process, the results are shown in Table (4.36).The
full simulation result is shown in appendix (D).
Calculated of the value added percent is as follows:
Value added percent = 1906.15 / 2563.05 = 74%
No.
1
Table 4.36 Project duration without the most wasting activity
Process
Non- value
added process
Foundation Form work Concrete
Ground floor column Form work Concrete
First floor column Form work Concrete
72
Total
duration
(hours)
2563.05
V.A
Percent
(%)
74%