Transcript Project Control – S

Project Control:
Developing the
As-Planned S-Curves
Part 08-01
July 20, 2015
Purpose
Illustrate how to develop a set of As- Planned
S-Curves from scheduling information and
estimates developed sometime before actual
construction operations begin.
 Review the conceptual design estimating
process to the extent necessary to set the
context.

CVEN-349
4/22/2003
Learning Objectives

Be able to construct an as-planned
schedule of work and cost versus elapsed
time from a typical (but simplified)
construction project Gantt Chart.

Be able to plot and identify the as Planned
S-Curves best representing these
schedules.
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Who Develops the As Planned
Gantt Chart? And When?



It depends upon what part of the process is
in question.
We are going to assume that the Gantt
Chart is developed by the Contractor to plan
construction operations.
We are going to assume that the schedule
data are generated sometime before the
onset of actual field operations.
CVEN-349
4/22/2003
Example Construction
Project

The project is to reconstruct 2-miles of park
access road conforming to Texas FM-Road
standards. This involves the following tasks:
Mobilization – Equipment, office set up, etc.
2. Sub-base preparation – hauling, grading and
compaction, redo of some culverts, etc.
3. Base course construction – hauling, grading and
compaction.
4. Wearing Course construction – shoot and chip
5. Demobilization – Clean up, equipment, office,
etc.
1.
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Class Discussion Exercise #2.1
on Construction Methods.
Ask Selected Individuals or Pairs to answer
the following:
 What is Base Material and what is its
purpose in the design of the road?
 How is the Base built?
 What is “shoot and chip?”
 What is Pea Gravel?
 What is the design profile of a FM Road?
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Project Task Duration and
Cost Data
Task
1 Mobilization
2 Sub Base
3 Base
4 Pave
5 Demobilization
Days
1
10
11
4
2
$$/Day
1,000
3,500
51,000
25,000
1,000
Assume:
 All labor, material and equipment cost estimates are available
from the estimating process.
 Maximum Task overlap with a 1-day minimum delay on an early
start schedule.
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Assumed Estimating
Process





The entire project is broken into Work Packages (work breakdown
structure): build base, shoot and chip, etc.
Estimated unit quantities for each work package are calculated from
the plans and specifications at an appropriate level of detail.
The corresponding unit prices and productivity rates are obtained
from historical data – We will use the R. S. Means manual in this
class.
Work Package (or Task or Activity) durations and costs are derived
from the historical data as applied to the estimates.
These data serve as inputs to the scheduling process which result in
Bar-Charts similar to the one on the next slide.
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Class Exercise 08.01.1
As individuals describe the crew (equipment
and personnel) configuration necessary to
construct the base course.
 As Pairs agree upon the configuration.
 As a Team, estimate the hourly cost rate.

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Example Gantt Chart with
Related S-Curve % Data
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17
S
S
B
S
B
S
B
S
B
S
B
S
B
S
B
S
B
B
S
B
S
S
S
100%
100%
100%
100%
1
1
1
28
93%
96%
100%
100%
1,000
96%
1
89%
25,000
92%
2
86%
25,000
82%
2
79%
75,000
71%
2
71%
75,000
63%
2
64%
54,000
55%
2
57%
54,000
47%
2
50%
54,000
40%
2
43%
54,000
32%
2
36%
54,000
24%
2
29%
54,000
16%
2
21%
54,000
9%
2
14%
54,000
1%
1
7%
54,000
0%
4,000
D
1
1,000
D
693,000
S
B
1,000
1
M
4%
Cumulative
Cost in $$'s
ES
1
2
3
12
16
Cummulativ
e Work Units
$$/Day
$ 1,000
$ 4,000
$ 50,000
$ 25,000
$ 1,000
Daily Cost
Days
1
10
11
4
2
Daily Work
Task
M
S
B
S
D
Simplifying assumptions: All work is equally weighted where 1 day equals 1 unit of work.
Daily work accomplished is NOT a function of daily cost.
Class Exercise #08-01.2
As Individuals, compute the number of
cubic yards of base material required
to build 2-miles of FM Road base, 24feet wide, and 1-foot thick?
 As Pairs, compare answers and then
compute the linear feet of daily
progress, if you can build 2,700 sqyds of base per day?

CVEN-349
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What Does all
this Imply?
The relationship between
time and cost and time and
work.
For example, at the end of
day 8 you plan to have
completed 50% of the Work
and to have spent 47% of
the Budget.
CVEN-349
Day
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Cost % Work %
0%
4%
1%
7%
9%
14%
16%
21%
24%
29%
32%
36%
40%
43%
47%
50%
55%
57%
63%
64%
71%
71%
82%
79%
92%
86%
96%
89%
100%
93%
100%
96%
100%
100%
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Corresponding As-Planned
S-Curves
100%
200%
90%
180%
80%
160%
70%
140%
60%
120%
50%
100%
40%
80%
30%
60%
20%
40%
10%
20%
0%
0%
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
CVEN-349
Schedule
in Days
4/22/2003
Cumulative Work
Cummulative Cost
Note: The
relationship
between the
scales. There
is a reason –
to make
room for the
As-Built
S-Curves
As Planned S-Curves
Exercise 08-01.3

Individually, using
engineering paper, plot
the S-Curves for these
data, label the axes, the
curves, and the plot.

Turn in your work before
you leave.
CVEN-349
Day
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Cost % Work %
0%
4%
1%
7%
9%
14%
16%
21%
24%
29%
32%
36%
40%
43%
47%
50%
55%
57%
63%
64%
71%
71%
82%
79%
92%
86%
96%
89%
100%
93%
100%
96%
4/22/2003
100%
100%
Module Assessment
Question

If you had to ask a question about this
topic, what would it be?
CVEN-349
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