Answered Essay: Assume that you are the subcontractor responsible for a 10 kilometer long linear project in a pipeline project, which has following 5 activities: (P) Excavating trench; (Q) Laying sub-base; (R) Laying

Assume that you are the subcontractor responsible for a 10 kilometer long linear project in a pipeline project, which has following 5 activities: (P) Excavating trench; (Q) Laying sub-base; (R) Laying
concrete pipe; (S) Backfilling trench; (T) Compacting. The productivity rates of your labour crew for these 5 activities are 500, 150, 250, 400, 250 m/day respectively. You should allow a minimum of EITHER 1-day time buffer OR 250 meters distance buffer between individual activities. You are
required to prepare:
(d) a suitable plan based on Linear Schedule Method; and
(e) suggest your recommendation for a fast-tracked completion using planning by
blocks in linear projects.

Expert Answer

 

All answers are according to the data referred below / links given.

I am considering all the activities with Finish to Start relationship, i.e. Q can start only if the activity P have completed and so on. (eg. for backfilling trench of 250 m, 250 m sub-base should already be laid)

Q1. Suitable Plan based on Linear Schedule Method.

Ans. Clearly activity Q (Laying Sub-base) is the critical activity as because of it’s slowness, other activities are getting delayed.

So, total 84 days would be taken to complete this project with Activity P starting on Day 1, Q on Day 2, R on Day 29, S on Day 44 & T on Day 45.

Suggestion: TILOS software would help in plotting the activities and getting the desired results quickly.

Q2. Recommendation for a fast-tracked completion using planning by
blocks in linear projects.

Ans. Following reccomendations would help to complete the project early:

1. Deploy more people when activity Q starts as it is the slowest, accordingly it’s successor activities can be started early.

2. As activity P can be completed in 20 days, the labor for that activity can be utilised for actiity Q.

Clearly, by varying the manpower and adjusting according to the type of work can help in saving time and money to quite an extent.

Refer to :

https://media.cheggcdn.com/media%2Ff5f%2Ff5f6f38b-f24e-4a7d-888a-71a73ba30430%2FphpTlXGzw.png

https://media.cheggcdn.com/media%2Fccc%2Fccc1156b-1162-4d8e-877e-6cddea16ec0a%2Fphp8mfxMQ.png

Linear Pipeline Project of 10 Km Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day
Activity Start Day of Activity Total Scope Productivity / day (m) Days required 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Excavating Trench <P> (m) Day 1 10000 500 20 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000 8500 9000 9500 10000
Laying Sub-base <Q> (m) Day 2 10000 150 66.67 150 300 450 600 750 900 1050 1200 1350 1500 1650 1800 1950 2100 2250 2400 2550 2700 2850 3000 3150 3300 3450 3600 3750 3900 4050 4200 4350
Laying Concrete Pipe <R> (m) Day 29 10000 250 40 250 500
Backfilling Trench <S> (m) Day 44 10000 400 25
Compacting <T> (m) Day 45 10000 250 40
Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day
Activity 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60
Excavating Trench <P> (m)
Laying Sub-base <Q> (m) 4500 4650 4800 4950 5100 5250 5400 5550 5700 5850 6000 6150 6300 6450 6600 6750 6900 7050 7200 7350 7500 7650 7800 7950 8100 8250 8400 8550 8700 8850
Laying Concrete Pipe <R> (m) 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000 5250 5500 5750 6000 6250 6500 6750 7000 7250 7500 7750 8000
Backfilling Trench <S> (m) 400 800 1200 1600 2000 2400 2800 3200 3600 4000 4400 4800 5200 5600 6000 6400 6800
Compacting <T> (m) 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000
Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day Day
Activity 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
Excavating Trench <P> (m)
Laying Sub-base <Q> (m) 9000 9150 9300 9450 9600 9750 9900 10000
Laying Concrete Pipe <R> (m) 8250 8500 8750 9000 9250 9500 9750 10000
Backfilling Trench <S> (m) 7200 7600 8000 8400 8800 9200 9600 10000
Compacting <T> (m) 4250 4500 4750 5000 5250 5500 5750 6000 6250 6500 6750 7000 7250 7500 7750 8000 8250 8500 8750 9000 9250 9500 9750 10000
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