Use a prescribed grid layout to estimate straight bars. This is useful when a drawing already specifies diameter, maximum spacing and cover.
- Length and width
- Overall slab dimensions. Bars parallel to the length are counted across the width, and vice versa.
- Cover and two bar directions
- One clear cover; a diameter and maximum centre spacing for each direction.
- Mats and slab quantity
- One or two mats, multiplied by the number of identical slabs.
Choose each bar diameter independently. The interval count rounds up so the resulting centre spacing does not exceed the requested maximum.
- Bar counts and actual centre spacing in each direction, with a plan view of the grid. The total count includes all selected mats and identical slabs.
- Cut lengths, total pieces, installed length and theoretical mass; handoff to Purchase & Cut.
One mat in one slab. Direction A runs along its length; B runs across it.
| Quantity | Value |
|---|---|
| Slab length × width; cover | 5 × 3 m; 40 mm |
| A: diameter; maximum centres | 12 mm; 200 mm |
| B: diameter; maximum centres | 16 mm; 250 mm |
| A: pieces × cut length | 16 × 4.920 m |
| B: pieces × cut length | 21 × 2.920 m |
| A; B actual centres | 193.867 mm; 245.200 mm |
| Installed total; theoretical mass | 140.040 m; 166.672 kg |
Centreline span = count dimension − 2 × cover − diameter. Intervals = ceil(span / maximum centres); bars = intervals + 1. Cut length = the other dimension − 2 × cover.
Mass uses π × diameter² / 4 × 7850 kg/m³ × length, calculated separately by diameter. Values above are rounded to three decimals for this guide.
After a valid grid or straight-bar result, enter the stock length for each diameter. Set cut loss, a reusable-remnant threshold and a specified lap only where needed. A piece longer than usable stock requires longer stock or an explicitly supplied lap.
The plan separates installed length, physical cut pieces, added lap length, purchased length, cutting loss and remnants. Read the solver status: “best found” means the best plan found within its search, not proof of the absolute minimum.
Metric and imperial dimensions are supported. Centre spacing is measured between bar axes; clear cover is measured to the outside of the bar. Neither cover nor lap is selected from structural loads by the app.
Diameter choices are physical sizes. They do not promise a country-specific grade catalogue. Theoretical mass from diameter is an estimate; use the applicable product data when purchasing.
Openings, bent bars, chairs and an irregular slab boundary are not part of this rectangular straight-bar grid.
Why are there more bars than intervals?
The first and last bars form the two ends of the interval chain. Fifteen intervals therefore need sixteen bars.
Does the result include purchase waste?
Installed totals do not. Open Purchase & Cut and specify the available stock and cutting rules.
- Why are there more bars than intervals?
- The first and last bars form the two ends of the interval chain. Fifteen intervals therefore need sixteen bars.
- Does the result include purchase waste?
- Installed totals do not. Open Purchase & Cut and specify the available stock and cutting rules.
Measurements, units and material terms
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