MULTI-PLATE PRODUCT GUIDE - Armtec

MULTI-PLATE_HEIGHT-OF-COVER TABLEPipe-ArchSpanRiseMinimumCoverMinimumThicknessMaximum Cover (metres)to restrict Corner Pressure to the followingmm mm mm mm 100 kPa 200 kPa 300 kPa 400 kPa2,050 1,520 350 3.0 2.9 6.0 9.1 12.22,240 1,630 383 3.0 2.7 5.6 8.6 11.52,440 1,750 415 3.0 2.5 5.4 8.2 11.02,590 1,880 441 3.0 2.5 5.4 8.2 11.02,690 2,080 458 3.0 2.8 5.9 8.9 11.93,100 1,920 669 3.0 1.9 4.1 6.3 8.43,400 2,010 850 3.0 1.4 3.3 5.1 6.93,730 2,290 731 3.0 1.5 3.5 5.3 7.23,890 2,690 683 3.0 1.9 4.2 6.4 8.64,370 2,870 801 3.0 1.6 3.6 5.6 7.54,720 3,070 853 3.0 1.5 3.4 5.2 7.05,050 3,330 891 3.0 1.5 3.3 5.0 6.85,490 3,530 977 3.0 1.3 3.0 4.6 6.25,890 3,710 1,064 3.0 1.2 2.58 4.3 5.86,250 3,910 1,108 4.0 1.1 2.6 4.1 5.5NOTESThe maximum Heights-of-Cover havebeen determined in accordance withCHBDC Design Procedures and thefollowing assumptions:• Unit weight of backfill materialassumed to be 22 kN/m 3• Backfill is assumed to be compactedto a minimum of 95% StandardProctor Dry Density• Highway Live load used in the designprocedure is the CL-625 truck as perCAN/CSA S6 (CHBDC)• Minimum height of cover is based onCHBDC (S6) formula for spans >3,000mm• CHBDC minimum heights of cover forCL-625 highway loads are measuredfrom the top of the pipe to theroadway surface• For spans < 3,000mm, minimumheights of cover for CL-625 highwayloads are not less than one sixth ofthe span nor 300mmFor AISI height of cover tables, pleaserefer to the Corrugated Steel PipeInstitute (CSPI) “Handbook of SteelDrainage and Highway ConstructionProducts”