A | B | C | D | E | F | G | H | I | J | K | |
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1 | Pre-condition of road design | ||||||||||
2 | |||||||||||
3 | Table-1 ; | Relation between Radius and Super Elevation by different driving speed | |||||||||
4 | * Maximum super elevation fixed 6% due to privent falling down of over loading | ||||||||||
5 | heavy trucks. | ||||||||||
6 | 120km/h | 100km/h | 80km/h | 60km/h | Super Elevation | ||||||
7 | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | |||
8 | Radius (m) | (%) | |||||||||
9 | 570 | 610 | 380 | 430 | 230 | 280 | 120 | 150 | 6 | ||
10 | 610 | 670 | 430 | 480 | 280 | 330 | 150 | 190 | 6 | ||
11 | 670 | 760 | 480 | 550 | 330 | 380 | 190 | 230 | 6 | ||
12 | 760 | 880 | 550 | 640 | 380 | 450 | 230 | 270 | 6 | ||
13 | 880 | 1,030 | 640 | 760 | 450 | 540 | 270 | 330 | 6 | ||
14 | 1,030 | 1,280 | 760 | 930 | 540 | 670 | 330 | 420 | 5 | ||
15 | 1,280 | 1,660 | 930 | 1,210 | 670 | 870 | 420 | 560 | 4 | ||
16 | 1,660 | 2,300 | 1,210 | 1,700 | 870 | 1,240 | 560 | 800 | 3 | ||
17 | 2,300 | 7,500 | 1,700 | 5,000 | 1,240 | 3,500 | 800 | 2,000 | 2 | ||
18 | 7,500 | 5,000 | 3,500 | 2,000 | |||||||
19 | |||||||||||
20 | Figure-1 ; | Relation for Super Elevation Between Straight and Curve of alignment | |||||||||
21 | * Road camber shall be -1.5% at R=∞ (straight) for drainage of road surface. | ||||||||||
22 | |||||||||||
23 | BC | R | |||||||||
24 | |||||||||||
25 | R = ∞ | ||||||||||
26 | |||||||||||
27 | |||||||||||
28 | |||||||||||
29 | 6.0% | ||||||||||
30 | 0% | 1.5% | |||||||||
31 | -1.5% | 6.0% | |||||||||
32 | |||||||||||
33 | |||||||||||
34 | |||||||||||
35 | TR | SR | |||||||||
36 | |||||||||||
37 | Figure-2 ; | ||||||||||
38 | Taper rate=75m/(1.5%+6%)=10m/% | 6.0% | |||||||||
39 | 0% | ||||||||||
40 | -1.5% | ||||||||||
41 | 75m | ||||||||||
42 | |||||||||||
43 | The taper is 75m section from -1.5% to 6%. | ||||||||||
44 | Taper rate=10m/% . | ||||||||||
45 | For Calculation example | ||||||||||
46 | Conditions: | Radius=400m | |||||||||
47 | Curb length=139.626m | ||||||||||
48 | Super elevation (R=400)=6% (See Table-1) | ||||||||||
49 | TR=(1.5%-0%)×Taper rate=1.5%×10m/%=15m | ||||||||||
50 | SR=(6%-0%)×Taper rate=6%*10m/%=60m | ||||||||||
51 | When BC is assumed 100, EC becomed 239.626 automatically. | ||||||||||
52 | (BC+Curb length=100+139.626=239.626) | ||||||||||
53 | |||||||||||
54 | The above conditions (TR=15m,SR=60m,Radius=400m,BC=100,EC=239.626 and Super elevation=6%) | ||||||||||
55 | inputted in Super elvation sheet. |