You are asked to estimate the duration and cost of an excavation project. You are given the area information
referred to and the results of land investigations. This information includes:
1. The estimated work volume is 50,000 bcm.
2. In the project, there are 2 jobs, namely excavation and disposal of excess material.
3. The type of material on site is sandy silt with a material density of 1610 kg / m3 in the loose and 1825 conditions
kg / m3 in original condition.
For cellar excavation work, you choose to use a backhoe. Backhoe has specifications
as follows:
a. Capacity (lcm) 1.50
b. Cycle Time (minutes) 0.5
c. The average digging depth (m) is 5.6
d. Maximum digging depth (m) 8.5
e. Turning angle () 90
f. Efficiency 0.75
g. BFF 0.95
The excavated material is then dumped into an area 14 km from the project. Road conditions between excavation projects
and the location of material disposal is quite good with RR 3% and GR as follows:
• 4 km + 6% Grade
• 5 km -7% Grade
• 5 km 0% Grade
For disposal of this material, you choose to use the HD225-5 truck. The specifications of the truck are:
a. Capacity: 17.7 m3 b. Empty weight: 22,450 kg
c. Full weight: 47,525 kg d. Fill time: 3.5 min
e. Unloading time: 3.0 min f. Efficiency 50 min / hour
Using the information above, determine:
1. (15 points) Backhoe productivity
2. (20 points) Truck productivity
3. (7 points) Number of trucks needed if 2 backhoes are available for the job
4. (8 points) Duration of the project
5. (15 points) Estimate the cost of the project, with an estimated unit price as follows:
i. The price of mobilization and demobilization of each backhoe is 3,000,000, -
ii. The rental price for a backhoe with a capacity of 1.5 cm is 200,000, - / hour
iii. Operator fee of 200,000 / day
iv. Fuel costs 12,000, - / liter with a usage of 20 liters / hour for backhoe and 25
liters / day for trucks.
v. The rental price for the truck is 600,000, - / day
vi. Truck driver wages 150,000 / day
vii. Project overhead costs are 8% of the total above costs.
2.If during the execution of the work above, one of the trucks was damaged on the afternoon of the 10th day so that the work became
slow down. What is the duration of the work after the breakdown of one truck.
3.Determine the amount of the project cost after truck damage occurs if every day the project delays, the contractor has to pay
a fine of 1 per mile of the agreed upfront fee.

Transcribed Image Text:

Figure 2 top view 0.90 0.00 100.00 200.00 300.00 400.00 500.00 600.00 700.00 800.00 900.00 1000.00 Figure 1 Side view 4.00meter 3.00- 2.00 1.00- 0.00 0.00 100.00 200.00 300.00 400.00 500.00 600.00 700.00 800.00 900.00 1000.00 base excavation existing surface height Figure 2 top view 0.90 0.00 100.00 200.00 300.00 400.00 500.00 600.00 700.00 800.00 900.00 1000.00 Figure 1 Side view 4.00meter 3.00- 2.00 1.00- 0.00 0.00 100.00 200.00 300.00 400.00 500.00 600.00 700.00 800.00 900.00 1000.00 base excavation existing surface height

Answer rating: 100% (QA)

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