Optimizing Construction Project Schedules
Learn how to create a line of balance schedule for a construction project and optimize the duration by managing team sizes and buffer times effectively. Find out the overall project duration, end date of specific house constructions, and the impact of releasing additional teams on project completion. Dive into practical examples and strategies for efficient project management.
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1 University of College of Engineering High. & Trans Eng. Dep. University of Mustansiriyah College of Engineering 3 3rd High. & Trans Eng. Dep. Mustansiriyah 2019 2019- -2020 rdStage 2020 Stage
2 Line of Balance Example 3 The construction plan for a house is shown in the figure below. The following table shows the operation together with the estimated man hours required and the team size for each operation with minimum buffer time between each two activities. Prepare a line of balance schedule for a contract of 80 houses based on a rate of build of three houses per 2 days and each team working at their natural rate assuming a 6 days working weekly and 8-hours per day. 1. what is the overall duration of the project? 2. the date of the end of construction of the house no. 30. 3. after the completion of the house no. 30, the contractor decided to release 2 teams work from the activity F. find the new completion date of the project. Man hours Min. buffer time Activities Team size A 240 5 4 B 140 4 2 C 240 6 5 A D C F D 166 3 2 B E E 251 5 4 F 315 7 -
3 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G Activities A 240 5 4 G=9 ? 6 8=3? 16 B 140 4 2 C 240 6 5 D 166 3 2 E 251 5 4 F 315 7 -
4 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G Activities 45 A 240 5 4 G=9 ? 6 8=3? 16 B 140 4 2 C 240 6 5 D 166 3 2 E 251 5 4 F 315 7 -
5 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G Activities 45 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 B 140 4 2 C 240 6 5 D 166 3 2 E 251 5 4 F 315 7 -
6 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g Activities 45 45 28 48 30 45 56 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 B 140 4 2 C 240 6 5 D 166 3 2 E 251 5 4 F 315 7 -
7 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U Activities 45 45 28 48 30 45 56 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 E 251 5 4 F 315 7 -
8 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U Activities 45 45 28 48 30 45 56 9 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 E 251 5 4 F 315 7 -
9 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U Activities 45 45 28 48 30 45 56 9 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 8.5 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 E 251 5 4 F 315 7 -
10 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U T Activities 45 45 28 48 30 45 56 9 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 8.5 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 T =(M/8Q) E 251 5 4 F 315 7 -
11 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U T Activities 45 45 28 48 30 45 56 9 6 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 8.5 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 T =(M/8Q) E 251 5 4 F 315 7 -
12 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U T Activities 45 45 28 48 30 45 56 9 6 5 5 7 7 6 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 8.5 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 T =(M/8Q) E 251 5 4 F 315 7 -
13 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U T S Activities 45 45 28 48 30 45 56 9 6 5 5 7 7 6 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 8.5 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 T =(M/8Q) E 251 5 4 S = (79*6)/U =474/U F 315 7 -
14 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U T S Activities 45 45 28 48 30 45 56 9 6 5 5 7 7 6 53 50 50 55 56 56 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 8.5 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 T =(M/8Q) E 251 5 4 S = (79*6)/U =474/U F 315 7 -
15 Line of Balance No. of units Time, days 53 5960 A D C F B E 0 6 10 Time, days
16 Line of Balance No. of units Time, days 79 86 53 59 63 68 78 85 90 96 A D C F B E Finish time=96 0 6 30 13 18 23 34 40 Time, days
17 Line of Balance No. of units 80 Time, days 79 86 53 59 63 68 78 85 90 96 the date of the end of construction of the house no. 30. 80-30 79 56= 50 96 ? 80-1 30 X= 60.5 61 days 96-x 1 0 6 30 13 18 23 34 40 96-40 Time, days
18 Line of Balance No. of units 80 Time, days 79 86 53 59 63 68 78 85 90 96 after the completion of the house no. 30, the contractor decided to release 2 teams work from the activity F. find the new completion date of the project. 30 1 0 6 30 13 18 23 34 40 61 Time, days
19 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U T S Activities 45 45 28 48 30 45 56 9 6 5 5 7 7 6 53 50 50 55 56 56 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 8.5 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 T =(M/8Q) E 251 5 4 S = (79*6)/U =474/U F 315 7 - N0. of teams of activity F =56/7=8 teams The new no. of teams=8-2=6 teams The new actual gang size of Activity F=g=6*7=42
20 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U T S Activities 45 45 28 48 30 45 42 9 6 5 5 7 7 6 53 50 50 55 56 56 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 8.5 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 T =(M/8Q) E 251 5 4 S = (79*6)/U =474/U F 315 7 - N0. of teams of activity F =56/7=8 teams The new U of F=42/59.1=6.39 The new no. of teams=8-2=6 teams The new actual gang size of Activity F=g=6*7=42
21 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U T S Activities 45 45 28 48 30 45 42 9 6 5 5 7 7 6 53 50 50 55 56 56 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 6.39 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 T =(M/8Q) E 251 5 4 S = (79*6)/U =474/U F 315 7 - The new U of F=42/59.1=6.39 N0. of teams of activity F =56/7=8 teams The new no. of teams=8-2=6 teams The new N= 80-30=50 The new actual gang size of Activity F=g=6*7=42 The new S of F= (50-1)(6)/6.39=46
22 Line of Balance Min. Buffer time Rate of production= 3/2days (6days/2)=9 Man hours Team size G g U T S Activities 45 45 28 48 30 45 42 9 6 5 5 7 7 6 53 50 50 55 56 46 A 240 5 4 G=9 ? 6 8=3? 16 26.25 45 31.13 47.1 59.1 9.6 9.6 8.67 8.6 6.39 B 140 4 2 U=9(g/G) C 240 6 5 D 166 3 2 T =(M/8Q) E 251 5 4 S = (79*6)/U =474/U F 315 7 - The new U of F=42/59.1=6.39 N0. of teams of activity F =56/7=8 teams The new no. of teams=8-2=6 teams The new N= 80-30=50 The new actual gang size of Activity F=g=6*7=42 The new S of F= (50-1)(6)/6.39=46
23 Line of Balance 61+46= 107 No. of units 80 Time, days 79 86 101 53 59 63 68 78 85 90 after the completion of the house no. 30, the contractor decided to release 2 teams work from the activity F. find the new completion date of the project. 55 61 30 1 0 6 30 13 18 23 34 40 Time, days
24 Line of Balance 61+46= 107 No. of units 80 Time, days 79 86 101 53 59 63 68 78 85 90 Finish time=107 55 61 30 1 0 6 30 13 18 23 34 40 Time, days
