Concrete Encasement Calculator
This concrete encasement calculator nets out what estimators often forget: the pipe. It computes the rectangular encasement prism along the run and subtracts the cylinder the pipe displaces — the true concrete volume for pipe and duct encasement.
Comment utiliser ce calculateur
- Saisissez vos dimensions — pieds pour les longueurs, pouces pour l'épaisseur.
- Ajustez les options — pourcentage de perte, taille du sac et prix local du béton.
- Lisez vos résultats — le volume, les sacs, le poids et le coût se mettent à jour en direct.
La formule
Net volume = (width × height × length) − π × (pipe Ø ÷ 2)² × length Exemple résolu : An 18 × 18 in encasement over 50 ft around a 6 in pipe: (1.5 × 1.5 × 50) − π × 0.25² × 50 = 112.5 − 9.8 = 102.7 ft³ ≈ 3.8 yd³.
Pipe encasement specs typically call for 6 inches of concrete cover on all sides, which sets the prism: pipe diameter + 12 inches each way. A 6-inch pipe gets an 18 × 18 inch encasement, as in the example.
For multi-conduit duct banks, subtract each conduit: run the calculator once per conduit size and deduct the additional displacements, or conservatively ignore small conduits (a 2-inch conduit displaces only 0.022 ft³ per foot).
Encasement pours flow under and around the pipe — strap or block pipes against flotation before the pour. Empty plastic pipe floats energetically in wet concrete.
Foire aux questions
Questions courantes sur le concrete encasement calculator.
How much concrete to encase a pipe?
Encasement cross-section (width × height) × run length, minus π r² × length for the pipe. The calculator handles both terms.
How much cover does encasement need?
Typically 6 inches of concrete on all sides of the pipe — check the utility's spec; some require 4 inches, telecom banks often 3.
Do I subtract small conduits?
Under 2 inches diameter, the displacement is usually within waste allowance. Above 4 inches, subtract — a 6 in pipe displaces nearly 0.2 ft³ per foot.
Why did my encasement pour float the pipe?
Buoyancy — concrete is 2.4× denser than water. Anchor or weight pipes at 5–10 ft intervals before pouring.
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