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12 - 1
CHAPTER
12
Trucks and Haulers
1. a.
𝐶𝐶𝐹)(27𝑐𝑢.𝑓𝑡.
𝑐𝑢.𝑦𝑑.)(0.85𝐶𝐶𝑌
𝐵𝐶𝑌)
From Table 12.1: Turn and Dump Time = 1.3 min.; Spotting Time = 0.15 min
= 2,848 𝑙𝑏.+ 2,848 𝑙𝑏.=5,696 𝑙𝑏.
1. a. (continued)
Distance Max. Speed Speed Factor Speed Time
0.5 mi. 11.6 mph 0.93 10.8 mph 2.8 min.
1.0 mi. 23.3 mph 0.97 22.6 mph 2.7 min.
0.5 mi. 8.7 mph 0.93 8.1 mph 3.7 min.
0.5 mi. 26.0 mph 0.93 24.2 mph 1.2 min.
1.0 mi. 26.0 mph 1.00 26.0 mph 2.3 min.
0.5 mi. 26.0 mph 0.93 24.2 mph 1.2 min.
12 - 3
(18.35 𝑚𝑖𝑛.)(1.20𝐿𝐶𝑌
𝐵𝐶𝑌)=𝟑𝟒.𝟕 𝑪𝑪𝒀
1. c.
2. a. 𝐿𝑜𝑎𝑑 𝑊𝑒𝑖𝑔ℎ𝑡=(18 𝐿𝐶𝑌)(2,400 𝑙𝑏.
𝐿𝐶𝑌)=43,200 𝑙𝑏.
Which is too heavy, thus, load capacity is governed by weight.
12 - 4
2. a. (continued)
(640 𝑙𝑏.)=72 𝑚𝑝ℎ;𝑢𝑠𝑒 26 𝑚𝑝ℎ
Distance Max. Speed Speed Factor Speed Time
3,000 ft. 6.4 mph 0.94 6.0 mph 5.7 min.
3,000 ft. 15.9 mph 0.94 15.0 mph 2.3 min.
3,000 ft. 17.9 mph 0.94 16.8 mph 2.0 min.
3,000 ft. 26.0 mph 0.94 24.4 mph 1.4 min.
12 - 5
ℎ𝑟. )
2. b. 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑇𝑟𝑢𝑐𝑘𝑠 = (17 𝑚𝑖𝑛.)
2. c.
ℎ𝑟. )
3. a.
𝐵𝐶𝑌)
Thus, load capacity is governed by volume.
𝐿𝑜𝑎𝑑𝑒𝑑 𝑊𝑒𝑖𝑔ℎ𝑡=44,400 𝑙𝑏.+ 48,947 𝑙𝑏.=93,347 𝑙𝑏.
Use fill factor from Table 8.2 for loose material.
12 - 6
3. a. (continued)
Maximum Speed determined from Figure 12.7.
Distance Max. Speed Speed Factor Speed Time
0.5 mi. 29.0 mph 0.93 27.0 mph 1.1 min.
0.5 mi. 11.0 mph 1.09 12.0 mph 2.5 min.
0.5 mi. 29.0 mph 0.93 27.0 mph 1.1 min.
0.5 mi. 31.6 mph 0.93 29.4 mph 1.0 min.
0.5 mi. 31.6 mph 1.00 31.6 mph 0.9 min.
0.5 mi. 28.0 mph 0.93 26.0 mph 1.2 min.
3. b. 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑇𝑟𝑢𝑐𝑘𝑠 = (11.87 𝑚𝑖𝑛.)
With 3 trucks:
12 - 7
3. b. (continued)
(227.4𝐿𝐶𝑌
ℎ𝑟.)= $2.86
With 4 trucks:
ℎ𝑟. )
ℎ𝑟.)= $2.78
Use 4 trucks.
3. c.
4. a.
𝐵𝐶𝐹)(27𝑐𝑢.𝑓𝑡.
𝑐𝑢.𝑦𝑑.)
Thus, load capacity is governed by volume.
𝐿𝑜𝑎𝑑𝑒𝑑 𝑊𝑒𝑖𝑔ℎ𝑡=44,400 𝑙𝑏.+ 38,520 𝑙𝑏.=82,920 𝑙𝑏.
12 - 8
From Table 12.1: Turn and Dump Time = 1.3 min.; Spotting Time = 0.8 min
𝐹𝑖𝑥𝑒𝑑 𝑇𝑖𝑚𝑒 = 3.5 𝑚𝑖𝑛.+ 1.3 𝑚𝑖𝑛.+ 0.8 𝑚𝑖𝑛.= 5.6 𝑚𝑖𝑛.
12 - 9
4. a. (continued)
Distance Max. Speed Speed Factor Speed Time
1,000 ft. 15.0 mph 0.86 12.9 mph 0.9 min.
4,000 ft. 31.6 mph 0.96 30.3 mph 1.5 min.
2,000 ft. 17.0 mph 0.92 15.6 mph 1.5 min.
2,000 ft. 31.6 mph 0.92 29.1 mph 0.8 min.
4,000 ft. 30.0 mph 1.00 30.0 mph 1.5 min.
1,000 ft. 31.6 mph 0.86 27.2 mph 0.4 min.
With 2 trucks: 𝐹𝑙𝑒𝑒𝑡 𝑃𝑟𝑜𝑑𝑢𝑐𝑡𝑖𝑣𝑖𝑡𝑦 =(2)(49.2𝐵𝐶𝑌
(98.4𝐵𝐶𝑌
ℎ𝑟.)= $5.45
With 3 trucks:
ℎ𝑟. )
𝐵𝐶𝑌)=139.5 𝐵𝐶𝑌
12 - 10
ℎ𝑟. ) + $200
ℎ𝑟. = $704
ℎ𝑟.
4. b. (continued)
ℎ𝑟. )
(139.5𝐵𝐶𝑌
ℎ𝑟.)= $5.05
Use 3 trucks.
4. c.
5. a.
𝐵𝐶𝑌)
Thus, load capacity is governed by volume.
𝐿𝑜𝑎𝑑𝑒𝑑 𝑊𝑒𝑖𝑔ℎ𝑡=44,400 𝑙𝑏.+ 45,000 𝑙𝑏.=89,400 𝑙𝑏.
5. a. (continued)
Maximum Speed determined from Figure 12.7.
Distance Max. Speed Speed Factor Speed Time
1.0 mi. 11 mph 0.96 10.6 mph 5.7 min.
1.0 mi. 28 mph 0.97 27.2 mph 2.2 min.
1.0 mi. 17 mph 0.96 16.3 mph 3.7 min.
1.0 mi. 28 mph 0.96 26.9 mph 2.2 min.
1.0 mi. 28 mph 1.00 28.0 mph 2.1 min.
1.0 mi. 28 mph 0.96 26.9 mph 2.2 min.
12 - 12
𝐵𝐶𝑌)(50𝑚𝑖𝑛.
ℎ𝑟. )
(21.7 𝑚𝑖𝑛.)(1.20𝐿𝐶𝑌
𝐵𝐶𝑌)=𝟐𝟗.𝟒 𝑪𝑪𝒀
5. b. 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑇𝑟𝑢𝑐𝑘𝑠 = (21.7 𝑚𝑖𝑛.)
5. c.
𝐵𝐶𝑌)(50𝑚𝑖𝑛.
ℎ𝑟. )
6. a. 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝐿𝑜𝑎𝑑 𝐶𝑦𝑐𝑙𝑒𝑠 𝑡𝑜 𝐿𝑜𝑎𝑑 𝑇𝑟𝑢𝑐𝑘 = (30 𝐿𝐶𝑌)
(4 𝐿𝐶𝑌)(1.05)=7.1 𝑜𝑟 8 𝑙𝑜𝑎𝑑 𝑐𝑦𝑐𝑙𝑒𝑠
(44.5 𝑚𝑖𝑛.)(1.18𝐿𝐶𝑌
𝐵𝐶𝑌)=𝟐𝟖.𝟔 𝑩𝑪𝒀
6. b. 𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝐻𝑎𝑢𝑙𝑒𝑟𝑠 = (44.5 𝑚𝑖𝑛.)
With 11 Haulers: 𝑃𝑟𝑜𝑑𝑢𝑐𝑡𝑖𝑣𝑖𝑡𝑦=(11)(28.6𝐵𝐶𝑌
12 - 13
6. b. (continued)
ℎ𝑟. )
With 12 Haulers:
ℎ𝑟. )
6. c.
