Question 1
Use the information contained below to compress one-time units per move using the least-cost method. Demonstrate how you can reduce the schedule until you reach the crash point of the network.
For each move, identify which activities were crashed, and the adjusted total cost, and explain your choice if you have to choose between activities that cost the same. Indirect costs for each duration are indicated in Table 1.2 below:
Which activities were crashed and the adjusted total cost?
Explain your choice if you have to choose between activities that cost the same.
Compute the optimum cost-time schedule for the project and the associated cost.
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Question 2
There are two tunneling machines (T1 and T2) that will bore from the same starting place to the endpoint. Their lengths are 2160m and 2348m respectively. T1 shall start 40 days before T2. They both shall proceed at the same rate of 8m/day. The tunnels need precast segment rings to be installed as they bore. The ring production schedule is 4 rings/day on a 6-day/week basis. The precast segment ring is to be installed as the tunneling machine bores the tunnel.
Assuming that T1 starts on 1 Jan 2023, calculate:
Completion dates for each of the machines.
How many precast segment rings are required per tunnel (at 1.5m/ring)?
Production time of the precast segment rings.
Installation time of the precast segment rings (A minimal lag of 100m is to be
maintained between the tunneling machine and the installation of the rings)
When is the latest date to start the production of the precast segment rings in order to meet the tunneling needs? Assume that the precast segment rings can be installed immediately after casting.
The production of the precast segment rings is delayed due to some unforeseen circumstances. To catch up with the production, 2 additional molds are made available on top of the 2 existing molds. Analyze the impact on the completion date with this move.
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