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c e u ng ec n ques or
Construction Projects
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The Planning process
Doing the Planning
Activities
Critical path method
Schedule Calculation
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- Project planning
- The goal of planning
The planning process
-
- Alternative Courses of Action
- Selection the Course of Action
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Doing the schedule
LevelI
The Planning stages
Activity list
Site Foundation StructuralFrame Etc.LevelII
Excavation Piling PileCap Etc.LevelIII
Forms Rebars Concrete Etc.Level
IV
Drawing
Fabricate Deliver aceLevelV
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Activities
- Drive pile
- xcava on
- Cut ile head
- Lean concrete- Footing form
- oo ng re ar
- Footin concrete
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CRITICAL PATH METHOD(CPM)
The critical path method focuses
managements attention on the
.
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Schedule Calculations
The next step in the CPM development process is to
.
These times are computed such that the network
logic is not violated and the projects overall
.
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ESn EFn
Duration
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Schedule Calculation (Conts)
orwar ass
Early finishn (EF) = early startn (ES) + durationn [4.1]
- Early Start / Early Finish
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Backward Pass
8
Figure 4.9vCalculation of early start ; use largest preceding
early finish.
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Critical Path and Critical Activities
1. The early start and late start times
2. The early finish and late finish times6 C 9
9 3 12
6 D 8
10 2 12
0 A 4
0 4 4
4 B 6
4 2 6
6 E 10
6 4 10
10 F 12
10 2 12
12 H 22
12 10 22
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PRECEDENCE LOGIC DIAGRAMS
on the node scheduling method.
The four precedence relationships are
Finish to start FS
Start to start (SS)
Finish to finish(FF)
Start to finish SF
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Place Strip
Concrete
1 day7 days
shoring
2 days
.
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Place Strip
1 day
2 days= ays
Fi ure 4.17 AON network finish to start relationshi with la
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continuous manner, the early start of the
succeeding activity and late finish of the
prece ng are ac v y can e ca cu a e
in E . 4. n 4.1 .
Early startn+1 = early finishn +lag [4.9]
Late finishn = late startn+1 lag [4.10]
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Start to Start
Excavate Excavate
footing
1 day
footings
1 day
Form &p ace
Concrete
2 days
Figure 4.18 AON network finish to start relationship
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Start to Start (conts)
Excavate
footing
2days
orm p ace
concreteSS = 1
Figure 4.19 AON network start to start relationship with lag
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The early start of the succeeding activity and late
finish of preceding activities can be calculated byE s. 4.11 & 4.12 .
Early startn+1 = early startn +lag [4.9]
Late finishn = late startn+1 lag [4.10]
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Finish to Finish
n+1 n
durationn+1 [4.13]
Late finishn
= late startn+1
lag [4.14]
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Start to finishThe start to finish relationship is not support by
most sc e u ng so tware.
footings
3 da s Placeconcrete
footings
aysPlace rebarfootings
ays Figure 4.20 AON network finish to start
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ormfootings
FF = 2
concrete
footin s4 days
Figure 4.21 AON network finish to finish relationship
with lag
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