3.Scheduling Techniques for Construction Projects

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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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3.Scheduling Techniques for Construction Projects

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