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EAGLE CORR PE™ * - JM Eagle

EAGLE CORR PE™ * - JM Eagle

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ment, and support. Portions of the trench that are excavated below gradeshould be returned to grade and compacted as required to provide propersupport. If the native trench soil is not suitable for the pipe bedding, thetrench should be over excavated and refilled with suitable foundation materialas specified by the engineer. A cushion of acceptable bedding materialshould always be provided between any hard foundation and the pipe.Large rocks, boulders, and stones should be removed to allow a minimumof 4 inches of soil cushion on all sides of the pipe and accessories.4.2 TRENCH EXCAVATIONThe minimum width of a trench to insure the proper installation of a buriedconduit depends on the pipe diameter, embedment material and compactionrequirements. Trench widths for small diameter pipes are typically determinedby standard excavator bucket sizes. Trenches that are too narrow do not allowfor the proper amount and compaction of embedment material in the haunchzones, while trenches that are too wide result in unnecessary costs. Recommendedminimum trench widths per ASTM D2321 are shown in Table 5.Table 5Nominal IDIN (mm)Minimum Trench widthsAverage ODIN (mm)minimum trench width 1IN (m)4 (100) 5 (120) 21 (0.5)6 (150) 7 (174) 23 (0.6)8 (200) 9 (231) 25 (0.6)10 (250) 11 (290) 27 (0.7)12 (300) 14 (363) 30 (0.8)15 (375) 17 (444) 34 (0.9)18 (450) 21 (529) 38 (1.0)24 (600) 28 (699) 46 (1.2)30 (750) 35 (880) 55 (1.4)36 (900) 42 (1055) 64 (1.6)42 (1050) 47 (1204) 71 (1.8)48 (1200) 54 (1367) 79 (2.0)60 (1500) 67 (1693) 95 (2.4)1Minimum trench width per ASTM D2321 = greater of OD+16" or 1.25×OD+12".4.3 PIPE LAYING36 <strong>EAGLE</strong> <strong>CORR</strong> PE INSTALLATION GUIDE

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