TM 5-820-4/AFM 88-5, Chap 4
Table C7. Suggested Maximum Cover Requirements for Structural Plate Steel Pipe, 6-Inch Span, 2-Inch Deep
Corrugations
H-20 HIGHWAY LOADING
MAXIMUM COVER ABOVE TOP OF PIPE, FEET
THICKNESS , INCHES
DIAMETER,
.249
.280
.168
.188
.218
.138
FEET
.109
90
103
146
160
124
5.0
68
46
81
93
133
113
145
62
42
5.5
75
86
122
133
103
57
38
6.0
79
95
112
123
69
52
35
6.5
73
88
104
64
114
33
7.0
49
82
97
60
68
106
31
7.5
45
77
91
64
100
56
43
29
8.0
86
94
73
60
52
40
27
8.5
81
57
88
50
69
38
25
9.0
77
84
54
47
65
36
24
9.5
73
80
51
45
62
34
23
10.0
69
76
42
59
49
22
10.5
32
72
66
40
56
46
31
21
11.0
63
69
54
44
39
20
29
11.5
66
51
61
37
43
28
19
12.0
58
64
49
41
36
27
18
12.5
47
39
56
61
34
26
17
13.0
54
59
46
38
33
25
17
13.5
57
36
52
32
44
24
16
14.0
50
55
42
31
35
23
16
14.5
48
53
34
41
30
22
15
15.0
47
51
29
40
33
22
15
15.5
45
50
28
38
32
21
16.0
44
48
37
27
31
20
16.5
43
47
36
30
26
20
17.0
41
35
45
25
29
17.5
19
40
44
34
25
28
18.0
39
43
24
33
27
18.5
42
38
23
32
27
19.0
41
37
23
26
31
19.5
40
36
31
25
20.0
39
35
30
20.5
25
38
34
29
21.0
37
34
28
21.5
33
36
28
22.0
32
35
27
22.5
31
34
23.0
31
34
23.5
30
33
24.0
32
24.5
32
25.0
31
25.5
U. S. Army Corps of Engineers
C-13
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