遊び場の境界のコンクリート計算機 — 必要な量は？

遊び場の境界のコンクリートガイド

Playground edging footings are typically 4 inches wide × 4 inches deep — just enough to anchor timber or plastic edging. Use 3,000 PSI concrete. A 50-ft perimeter at 4×4 in uses about 0.25 cubic yards. Larger border footings for equipment anchors may need 12-in diameter × 24-in deep post holes.