Trench Pipe Bedding and Backfill Take-Off
Bedding stone (cy and tons), pipe-zone embedment aggregate, and backfill volume for a pipe trench from the trench and pipe dimensions per ASTM D2321.
Formula and source
bedding_cy = width x (bedding/12) x length / 27; bedding_tons = bedding_cy x density; embed_area = width x od_ft - (pi/4) od_ft^2; embedment_cy = embed_area x length / 27; backfill_cy = width x cover x length / 27.
ASTM D2321 (installation of buried thermoplastic pipe) and the typical municipal bedding detail by name; first-principles take-off.
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