TM 5-850-1
Table B-4. CBR and Thickness Requirements for 200, 10,000, and 50,000 Passes of Container-Handling Vehicles
Operating on Soils Surfaced with ISAI Landing Mat and with Subgrade Strengths of 4 and 10 CBRa
Passes
200
10,000
50,000
Thickness
Thickness
Thickness
Tire
Requirements
Requirements
Requirements
Tire
Contact
in.
in.
In.
Gross
Pressure, psi
Area
4-CBR
10-CBR
4-CBR
10-CBR
4-CBR
10-CBR
Weight
Payload
Infl-
Surface
Sub-
Sub-
Surface
Sub-
Sub-
Surface
Sub-
Sub-
2
Vehicle
lb
lb
tion
Contact
in.
CBR
grade
grade
CBR
grade
grade
CBR
grade
grade
Amphibian
b
LARC LX
319,000
120,000
42
42
1898
3.5
0
0
7
27
0
9
36
0
Straddle carriers
Shoremaster
129,000
67,200
100
105
154
3.5
0
0
8
22
0
10
32
0
Clark 512
164,500
67,200
132
133
210
5
6
0
11
28
7
14
37
11
Belotti B67b
159,800
67,200
125
115
380
5
8
0
11
26
7
14
34
11
Front-Loading Forklifts
c
Hyster H620B
140,710
62,000
100
145
224
6
10
0
13
40
6
19
51
20
LeTro-Porter 2582
165,200
67,200
70
102
800
12
21
6
22
51
21
25
65
27
Side-Loading Forklift
Lancer 3500
213,200
67,200
149
150
183
6
13
0
14
43
13
17
56
21
Yard Gantry
Travelift CH 1150
223,200
67,200
146
146
280
6
13
0
14
32
6
17
46
12
Mobile Cranes
d
P&H 3250-TC
396,021
0
100
106
260
13
36
10
26
81
32
35
82
32
e
d
LeTro Crane GC-500
708,504
0
35
69
1275
15
37
11
23
82
33
25
99
44
Tractor-Trailer Combination
M52 Tractor and Trailer
100,000
67,200
80
68
82.5
2.5
0
0
5
15
0
7
20
0
a M8A1 landing mat was not designed for use with large loads imposed by most of the equipment listed nor for traffic volumes exceeding about 2000 passes.
b As is well known, the LARC LX was not specifically designed for container handling. It has been included in this study for comparative purposes because of its
known operational capability on relatively low-strength soils.
c Maximum payload for the Hyster H620B.
d Zero payload while moving.
e Criteria do not exist for loads imposed by vehicles on M8A1 landing mat. Data shown are based on extrapolation and engineering judgment.
By U.S. Army Engineer Waterways Experiment Station
B-7
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