Mechanical · M-E4MKJ

Underground Pipe Trench and Bedding Detail

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An underground pipe trench assembly contains multiple pre-insulated or high-density polyethylene piping runs with minimum spacing requirements of twelve to sixteen inches. The pipe bedding consists of a four-inch minimum layer of sand for leveling and unstable soil conditions. Sand haunching is applied in maximum six-inch layers and tamped into place to remove voids beneath the pipe. Initial backfill comprises a twelve-inch sand cover over the top of the pipe laid in four to six-inch lifts and tamped simultaneously. A twelve-gauge tracer wire is centered no greater than six inches above the pipe, with a polyethylene trench marker positioned directly above each pipe. The trench excavation provides options for benched excavation, slope excavation, and trench protection walls.

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