Analysis and Calculations for Off-Highway Trucks and Scrapers

This assignment focuses on construction management principles, specifically analyzing the performance of off-highway trucks and scrapers. It includes calculations for gross truck mass, gross scraper mass, maximum tractive force, effective grade, total resistance, total cycle time, and production rate for a Komatsu HD325-7 off-highway truck and a Caterpillar 637G push-pull scraper. The analysis considers factors like bank density, swell, rolling resistance, grade, and efficiency. Additionally, the assignment addresses the production rate of a single drum roller and pressure loss calculations in a compressed air pipeline, demonstrating a comprehensive understanding of construction equipment and operations. Desklib provides students with access to similar solved assignments and study tools.

Running head: CONSTRUCTION MANAGEMENT 1
CONSTRUCTION MANAGEMENT
Name of Student
Institution Affiliation

CONSTRUCTION MANAGEMENT 2
Question 1
(10 marks)
For the Komatsu HD325-7 off-highway truck shown in the table below calculate the gross
truck mass (kg) when loaded to heaped capacity with material having the following
properties: Bank density = 1550 kg/m Swell = 44 % Please round your answer to the nearest
kilogram and enter the number only (do not include the unit or any spaces or commas)
(Peurifoy, 2012).
Answer 140120.65
Question 2
Calculate the gross scraper mass (kg). Please provide your answer in kg with a number only
(do not include the unit or any spaces or commas).
Answer 70680
Question 3
(10 marks) Calculate maximum tractive force (kN) on road at driving wheels when loaded.
Please provide your answer in kN with a number only (do not include the unit or any spaces
or commas).
Answer 1926.03
Question 4
(10 marks) Calculate the effective grade % on the haul road. Please provide your answer to
one decimal place and enter a number only (do not include the % or any spaces or commas).
Answer

CONSTRUCTION MANAGEMENT 3
Case 1 - When the scraper is ascending the slope
Effective grade = 7.5
Case 2 - When the scraper is descending the slope
Effective grade = -0.5
Question 5
(10 marks) Calculate total resistance (kg) while hauling. Please provide your answer in kg
with a number only (do not include the unit or any spaces or commas) (Magdoff, 2016).
Answer 9285
Question 6
Calculate the total cycle time (minutes). Please provide your answer in minutes to one
decimal place and enter a number only (do not include the unit or any spaces or commas).
Answer 10.005
Question 7
(10 marks) Calculate production rate, in Bank m /hr. Please provide your answer in Bank
m /hr with a number only (do not include the unit or any spaces or commas).
Answer 10476.011
Question 8
(10 marks)

CONSTRUCTION MANAGEMENT 4
Data for the Push-Pull scraper model 637G from the Caterpillar performance handbook,
edition 41 has been reproduced for you below. Using these data tables and charts estimate the
scraper’s likely production (Bank m /hr) given the following conditions: The scraper is being
struck loaded. Rolling resistance = 40 kg/t Operating conditions are average E ciency of theffi
driver and machine is 43 min/hr Soil density in bank = 1800 kg/m Soil density loose = 1580
kg/m Total fixed time = 2.3 minutes You should assume that the scraper is moving at a slow
speed when entering and leaving the loading and unloading areas. Use the reference tables
given in your study material where appropriate. The scraper is working on a route comprising
the following sections: Section Description Length (m) 1 Level turnaround and loading zone
(spotting and loading) 2 Haul road, 10% down grade 500 3 Haul road, 1% down grade 250 4
Level unloading area (manoeuvre and dumping) 5 Return road, 12% up grade 400 6 Return
road – level section 600.
Answer: 946.67
Question 9
(5 marks)
A single drum roller is to be used to compact the material hauled by scrapers to a fill site. The
roller and compaction situation have the following characteristics: Drum width of roller is
1650 mm Operating speed of roller during compaction 5.5 km/hr Compacted thickness of one
layer after required number of passes 140 mm Number of passes required to achieve desired
compaction 7 Combined efficiency of roller and operator 45 minutes/hour Shrinkage factor of
material 0.82 Calculate production rate of the roller in Bank m /hr. Please provide your
answer in Bank m /hr with a number only (do not include the unit or any spaces or commas)
(Holtz, 2014).

CONSTRUCTION MANAGEMENT 5
Answer 14460.98
QUESTION 10
(10 marks)
An 170 m long 100 mm diameter compressed air pipeline is to be run from a stationary
compressor to an air-track drill which requires a flow of 700 l/sec. The pipeline contains 2
large radius bends (R=2d) ,and 4 half closed gate valves. Calculate the loss of pressure which
will occur in the pipeline from the compressor to the drill. Assume leakage losses are zero.
Please round your answer to the nearest kPa and enter the number only (do not include the
unit or any spaces or commas) (Coleman, 2015).
Answer 1.65485
Question 11
(5 marks)
An air-track drill is rated as requiring 720 l/sec of compressed air at sea level. What flow
needs to be provided by the compressor if the air-track drill is to operate at an elevation of
1060 m? Please round your answer to the nearest l/sec and enter the number only (do not
include the unit or any spaces or commas) (Ciancio, 2014).
Answer: 817.66

CONSTRUCTION MANAGEMENT 6
References
Ciancio, A. (2014). General Concepts in Integrated Pest and Disease Management. Chicago:
Springer Science & Business Media.
Coleman, E. (2015). The New Organic Grower: A Master's Manual of Tools and Techniques
for the Home and Market Gardener,. Chelsea: Chelsea Green Publishing.
Holtz, R. D. (2014). An Introduction to Geotechnical Engineering. LONDON: Pearson.
Magdoff, F. (2016). Sustainable Soil Management. Texas: SARE.
Peurifoy, R. L. (2012). Construction Planning, Equipment, and Methods. London: McGraw-
Hill.