Page 64 - การระบายน้ำ

5-16
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ตารางท 5.5 Minium cover requirements, in feet, for airfields (reinforced concrete pipe)
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Weight 1 2 3 4
type 5,000-lb Single-wheel 15,000-lb Single-wheel 25,000-lb Single-wheel 40,000-lb Single-wheel
Pipe dia 12 24 36 48 60 72 12 24 36 48 60 72 12 24 36 48 60 72 12 24 36 48 60 72
(in)
GAGE

Class I 1.5 1.5 2.5 2.5 3.5 3.5 - 5.0
Class II 1.5 1.5 1.5 1.5 1.5 1.0 2.5 2.5 2.5 2.5 2.0 2.0 3.5 3.5 3.0 3.0 3.0 2.5 5.5 4.5 4.0 4.0 4.0
Class III 1.0 1.0 1.0 1.0 1.0 1.0 2.0 2.0 2.0 2.0 2.0 2.0 3.0 2.5 2.5 2.5 2.5 2.0 4.0 3.5 3.0 3.0 3.0 3.0
Class IV 1.0 1.0 1.0 1.0 1.0 1.0 1.5 1.5 1.5 1.5 1.5 1.5 2.0 2.0 2.0 2.0 2.0 2.0 3.0 2.5 2.5 2.5 2.0 2.0
Class V 1.0 1.0 1.0 1.0 1.0 1.0 1.5 1.0 1.0 1.0 1.0 1.0 2.0 1.5 1.5 1.5 1.5 1.5 2.5 2.0 2.0 2.0 2.0 2.0
Weight 5 6 7 8
type 60,000-lb Single-wheel 20,000-lb Twin-wheel assy 40,000-lb Twin-wheel assy 60,000-lb Twin-wheel assy
Pipe dia 12 24 36 48 60 72 12 24 36 48 60 72 12 24 36 48 60 72 12 24 36 48 60 72
(in)

GAGE
Class I - - 2.5 2.5 6.0 5.0 - -
Class II - - - - 5.5 5.0 2.5 2.0 2.0 2.0 2.0 2.0 6.0 5.5 4.0 3.5 3.5 3.5 - - - - 5.5 5.0
Class III 5.5 4.5 4.0 4.0 4.0 4.0 2.0 1.5 1.5 1.5 1.5 1.5 3.5 3.0 3.0 2.5 2.5 2.5 5.5 4.5 4.0 3.5 3.5 3.5
Class IV 3.5 3.0 3.0 3.0 3.0 3.0 1.5 1.0 1.0 1.0 1.0 1.0 2.5 2.0 2.0 2.0 2.0 2.0 3.5 3.0 2.5 2.5 2.5 2.5
Class V 3.0 2.5 2.5 2.5 2.5 2.5 1.0 1.0 1.0 1.0 1.0 1.0 2.0 1.5 1.5 1.5 1.5 1.5 2.5 2.5 2.0 2.0 2.0 2.0
Weight 9 10 11 12
type 80,000-lb Twin-wheel assy 100,000-lb Twin-wheel assy 120,000-lb Twin-wheel assy 40,000-lb Single-tandom assy

Pipe dia 12 24 36 48 60 72 12 24 36 48 60 72 12 24 36 48 60 72 12 24 36 48 60 72
(in)
GAGE
Class I - - - - - - 5.5 4.5
Class II - - - - - - - - - - - - - - - - - - 5.5 5.0 3.5 3.0 3.0 3.0
Class III - 6.5 6.0 5.0 4.5 4.5 - 7.5 7.0 6.0 6.0 5.5 - - - - 7.0 6.5 3.0 2.5 2.5 2.0 2.0 2.0
Class IV 4.0 4.0 3.5 3.0 3.0 3.0 5.0 4.5 4.0 4.0 4.0 3.5 5.5 5.0 5.0 4.5 4.0 4.0 2.0 1.5 1.5 1.5 1.5 1.5
Class V 3.5 3.0 3.0 2.5 2.5 2.5 4.0 3.5 3.0 3.0 3.0 3.0 4.5 4.0 4.0 3.5 3.5 3.5 1.5 1.0 1.0 1.0 1.0 1.0
Weight 13 14 15 16

type 60,000-lb Single-tandom assy 150,000-lb Twin-tandom assy 200,000-lb Twin-tandom assy 265,000-lb Twin-tandom assy
Pipe dia 12 24 36 48 60 72 12 24 36 48 60 72 12 24 36 48 60 72 12 24 36 48 60 72
(in)
GAGE
Class I - - - - - - - -
Class II - - - 5.5 5.0 4.5 - - - - - - - - - - - - - - - - - -
Class III 5.0 4.0 3.5 3.0 3.0 3.0 - - - - 7.0 6.0 - - - - - - - - - - - -
Class IV 3.0 2.5 2.0 2.0 2.0 2.0 6.0 5.0 4.0 4.0 3.5 3.5 7.5 6.5 6.0 5.0 5.0 4.5 9.5 8.0 7.5 7.0 6.5 6.0

Class V 2.0 2.0 1.5 1.5 1.5 1.5 4.5 4.0 3.5 3.0 3.0 3.0 6.0 5.0 4.5 4.0 3.5 3.5 6.5 6.0 6.0 5.5 5.0 5.0