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8/10/2019 L13b _ Linear Scheduling Method (LSM)1
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L13b Linear Scheduling Method (LSM)
Because of the repetitive nature of linearconstruction projects, Linear Scheduling Method(LSM) is specially for planning and scheduling thistype of project.
LSM plots lines of constant or varying slopes on twoaxes to represent activities. One axis is used torepresent the time. The other axis is used to recordthe progress of activities.
According to the characteristic of a project, theprogress could be distance (for highway and pipelineproject), floor levels (for building construction), orsections (for general).
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The slope of a line at any position or period of timerepresent the productivity (or rate of progress) atthat location or during that time period.
An activity is allowed to have interruptions during
the entire length of the project.The diagram is used to plan or record projectconstruction progress on activities which movecontinuously in sequence along the length of a single
project.
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A small bridge project
A
B
C
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Act. code Description Quantity Productivity Duration
1
2
3
4
5
67
8
9
1011
Excavation A
Excavation B
Excavation C
Foundation A
Foundation B
Foundation CPier A
Pier B
Pier C
Beams A-BBeams B-C
3000 m3
1500 m3
500 m3
200 m3
100 m3
150 m3
200 m3
180 m3
200 m3
24 no24 no
250 m3/d
250 m3/d
250 m3/d
25 m3/d
25 m3/d
25 m3/d10 m3/d
10 m3/d
10 m3/d
2 no/d2 no/d
12 d
6
2
8
4
620
18
20
1212
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This project can be scheduled as a linearproject. We measure the progress of eachactivity in percent complete. There are four
construction activities : excavation, foundation,pier, and beams
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Activity Quantity Percent Productivity Duration
Excavation
ABC
FoundationA
BCPier
ABC
BeamsA-BB-B
5000
30001500
500450
200
100150580
200180200
481212
100%
60%30%10%
100%44,4%
22,2%33,3%100%34,5%31,0%34,5%
100%50%50%
250
25
10
2
20
1262
188
4658
201820
241212
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Time (Working days)
Act.3
Act.2
Act.1
0 5 10 15 20
Progress
60
50
40
30
20
10
0
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Schedule the construction of the project from A to C100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90
BeamsPier
Foundation
Days
Excavation