3. Bar Chart Schedules

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CONSTRUCTION SCHEDULING

BAR CHARTS AND OTHERSIMPLE SCHEDULING

TECHNIQUESAsst. Prof. Dr.

Selim Baradan


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INTRODUCTION

On some projects, simple schedulingtechniques may be used moreeffectively than other more

sophisticated, complicatedscheduling methods and should notbe overlooked.


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SELECTING A SCHEDULING

SYSTEM

If two systems do the same job with thesame output, choose simpler system

Size and complexity of the project

Experience of the project team

Flexibility

Schedule is made for person receiving it,

not the person preparing it. Receiversshould be able to read and understand it.


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CHECKLISTS

Checklists simply consist of a list ofsteps to be taken in order toaccomplish a desired outcome

The purpose of a checklist is to makesure nothing is forgotten

They can be used alone or combinedwith other scheduling systems


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Ex: Concrete Finishing Checklist


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Ex:Checklist

with

dates


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DAILY TO-DO LISTS

A prioritized list of activities that need tobe accomplished on a daily basis

Developed either at the end of the day(for the next day) or beginning of each

day. The goal is to always be working on the

most important activity. Ensures that evenif everything is not done, the most

important things have been completedfirst and youve done the best thing youcould.

Best in conjunction with other methods ofplanning and scheduling.


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A daily to-do list


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ELECTRONIC PLANNERS

Smartphones, PDAs, tablets

Personal computers


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BAR (GANNT)

CHARTS


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INTRODUCTION

The most popular method

Gives a visual (graphic)representation of the project plan

Includes activities, durations, dates

Easily read and understood

Used to communicate the projectplan to everyone concerned withschedule


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History

Henry L. Gannt first used to plan andcontrol military operations duringWW1

a.k.a Gannt Chart


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CREATING BAR CHARTS

Create TimelineWrite calendar dates at top of the page

Skip non-work days

List the first activity on the left sideof the page and show a bar on thedates when that activity is expected

to take placeEnter the remaining activities

Sort them in chronological order


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SHOWING PROGRESS ON A

BAR CHART

Measuring performance andreporting it back is the key toimproving performance of the crews

Bar charts can show the plannedschedule along with the updatedschedule

Use two different colors for activitybars



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Bar Chart Displaying Progress



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EXERCISE

Material ProcurementActivity Description Predec. Succ. Duration

A Purchase Order - C,D 3

B Creating Schedule - E,F 5

C Estimating material costs A G 4

D Determining materialdelivery time

A H 7

E Training B H 4

F Estimating wages B G 5

G Estimating total project cost C,F - 5

H Doing the job D,E - 6



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Activities

Work Days

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

A

B

C

D

E

F

G

H

Solution


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Advantages (Cont.)

It gives a visual representation of theprocess of construction, which helpsthe management team and the field

workers, see what is planned andwhen activities should happen

A bar chart provides a goal to worktoward

A bar chart can be used to measureprogress and performance



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Disadvantages

The bar chart does not automaticallyshow the effects of changes. Themanager must rethink and redraw

the schedule continually. It is not possible to identify critical

activities that determine thecompletion date of the project.

It is very difficult to see the effectsof a (potential) change.



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Homework



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Activity Days Activity Days

Excavation (A) 4 Column (A) 16

Excavation (B) 2 Column (B) 8

Excavation (C) 2 Column (C) 8

Excavation (D) 5 Column (D) 20

Pile construction (C) 12 Girder (AB) 12

Foundation (A) 8 Girder (BC) 12

Foundation (B) 4 Girder (CD) 12

Foundation (C) 4Foundation (D) 10



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Only one team can be assigned for each activity

(excavation work, foundation, column and girderconstruction).

Similar activities for different parts of thebridge cannot be undertaken at the same time.

Project start date: March 05 2012

Sundays are nonwork days, also consider specificholidays if applicable.

What is the earliest completion time of the

project? (Consider all alternatives)

Solve the problem using Gannt Chart.

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3. Bar Chart Schedules