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