External Load Calculation for Buried Conduit

EXTERNAL LOAD CALCULATIONS FOR DIRECT BURIED CONDUIT
25701 Science Park Drive
Cleveland, Ohio 44122
216-464-3400
1-800-3CARLON (322-7566)
www.carlon.com
γγ
γγ
= UNIT WEIGHT OF BACKFILL (lb/ft
3
)
H = HEIGHT OF COVER (ft)
120 lb/ft
3
IS A COMMONLY USED VALUE FOR THE UNIT WEIGHT OF
BACKFILL.
LIVE LOADS (LL) CAN BE CALCULATED BY USING THE BOUSSINESQ
FORMULA FOR A POINT LOAD AT THE SURFACE OF THE SEMI-INFINITE
ELASTIC SOIL OR BY USING THE PREDETERMINED VALUES IN THE
FOLLOWING TABLE:
LIVE LOADS ON PVC OR HDPE CONDUIT OR DUCT
(LIVE LOADS TRANSFERRED TO CONDUIT lbs/in
2
)
HEIGHT OF
COVER
HIGHWAY RAILWAY AIRPORT HEIGHT OF
COVER
HIGHWAY RAILWAY AIRPORT
H (ft) H20
1
E80
23
H (ft) H20
1
E80
23
1 12.50 * * 14 * 4.17 3.06
2 5.56 26.39 13.14 16 * 3.47 2.29
3 4.17 23.61 12.28 18 * 2.78 1.91
4 2.78 18.40 11.27 20 * 2.08 1.53
5 1.74 16.67 10.09 22 * 1.91 1.14
6 1.39 15.63 8.79 24 * 1.74 1.05
7 1.22 12.15 7.85 26 * 1.39 *
8 0.69 11.11 6.93 28 * 1.04 *
10 * 7.64 6.09 30 * 0.69 *
12 * 5.56 4.76 35 * * *
40 * * *
1
SIMULATES 20 TON TRUCK TRAFFIC + IMPACT
2
SIMULATES 80,000 lb/ft RAILWAY LOAD + IMPACT
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