免费钢筋间距计算器
计算混凝土板、墙和基脚的钢筋间距和数量，输入跨度和间距即可获得精确布置方案。
Min concrete cover from edge to first bar
Number of Bars
30
Number of Bars vs Span Length
公式
## How to Calculate Rebar Spacing ### Formula **Usable Span = Total Span - 2 × Edge Cover** **Number of Bars = floor(Usable Span / Spacing) + 1** **Actual Spacing = Usable Span / (Number of Spaces) × 12** Edge cover is the minimum distance from the edge of the concrete to the nearest rebar. Typical cover is 3 inches for cast-against-ground concrete and 1.5 inches for formed surfaces.
计算示例
Rebar across a 30 ft span at 12-inch spacing with 3-inch edge cover.
- 01Cover in feet = 3 / 12 = 0.25 ft
- 02Usable span = 30 - 2 × 0.25 = 29.5 ft
- 03Spacing in feet = 12 / 12 = 1.0 ft
- 04Number of bars = floor(29.5 / 1.0) + 1 = 30 bars
- 05Actual spacing = 29.5 / 29 × 12 = 12.21 inches
常见问题
What is the minimum concrete cover for rebar?
3 inches for concrete cast directly against earth. 2 inches for formed concrete exposed to weather. 1.5 inches for formed concrete not exposed to weather.
What is the maximum rebar spacing?
ACI code limits rebar spacing to 18 inches or 3 times the slab thickness, whichever is less. For temperature/shrinkage steel, maximum spacing is 18 inches or 5 times the thickness.
How do I mark rebar spacing on forms?
Measure and mark the cover distance from each edge, then mark at the calculated spacing intervals. Snap a chalk line to guide placement.
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