| Scenario | Burrows | Length (m) | Diameter (mm) | Allowances | Material (L) | Labor (hr) |
|---|---|---|---|---|---|---|
| Sidewalk settlement repair | 8 | 4.5 | 75 | Void 10%, Overfill 12% | ~260 | ~1.6 |
| Warehouse slab edge voids | 14 | 6.0 | 90 | Void 15%, Overfill 18% | ~980 | ~5.4 |
| Embankment shoulder stabilization | 20 | 7.5 | 110 | Void 20%, Overfill 22% | ~2,250 | ~12.5 |
- Count burrow entries in the treatment area or zone.
- Measure typical tunnel length and diameter, then average.
- Set void and overfill allowances based on soil conditions.
- Choose severity to add conservatism and suggested cycles.
- Enter material density and your supplier unit cost basis.
- Set productivity and labor rates for your crew setup.
- Add mobilization, contingency, and any tax if needed.
- Press Calculate to see totals above the form.
- Use Download CSV or Download PDF for sharing.
Scope of Burrow Remediation Estimates
Burrow treatment work is often priced as a blend of material yield, injection time, and access constraints. This calculator supports early-stage estimating by converting tunnel geometry into treated volume, then translating volume into liters or kilograms using density. Use it to compare scenarios, validate supplier quotes, and build consistent bid assumptions across similar sites.
Interpreting Tunnel Geometry Inputs
The core model treats each burrow as a cylinder using tunnel diameter and average length. When measurements vary, choose a conservative diameter and a representative length from multiple probes. If you suspect branching, increase the void factor rather than inflating length. For zones with different sizes, run separate calculations and combine totals in your estimate file.
Allowances That Drive Quantity Risk
Void factor covers chambers, side tunnels, and collapsed pockets that are difficult to observe. Overfill addresses shrinkage, leakage into permeable soils, and compaction effects after injection. Severity adds an additional safety margin and suggests treatment cycles when re-burrowing or repeated collapse is likely. Waste allowance accounts for priming, spillage, and cleanup losses in the field.
Productivity, Crew Planning, and Example Data
Productivity is entered as net liters placed per hour. Adjust it for access, hose length, mixing speed, and stoppages for inspection or relocation. Crew size influences coordination overhead and can change effective output. Use the example below as a quick starting point and replace rates with your project pricing.
| Input | Example | Notes |
|---|---|---|
| Burrow count | 12 | Distinct entries within a treatment zone |
| Average length | 6.0 m | Based on probing and site history |
| Diameter | 90 mm | Effective tunnel diameter for volume |
| Void / Overfill / Waste | 10% / 15% / 3% | Allowances for uncertainty and loss |
| Productivity | 180 L/hr | Net injection rate for the crew |
Cost Reporting for Bids and Field Control
Material cost can be entered per liter or per kilogram to match supplier invoices. Labor cost is driven by injected liters and productivity, then combined with mobilization, contingency, and optional tax. Export CSV for takeoff files and PDF for site packages or approvals. Always confirm utility clearance, access restrictions, and local product data sheets before finalizing quantities.
FAQs
1) What should I enter if tunnel sizes vary a lot?
Split the work into zones with similar sizes and run separate calculations. This improves accuracy and makes it easier to justify assumptions in a bid. Combine exported totals afterward.
2) Should I use void factor or overfill for branching?
Use void factor for branching, chambers, and hidden voids. Use overfill for shrinkage, leakage, and compaction needs. Both can be used together when uncertainty is high.
3) How do I choose a material density value?
Use the product technical data sheet if available. For cementitious grout, values around 1.6–2.1 kg/L are common. Foam and sand-cement mixes can differ substantially.
4) Why does the calculator use liters for productivity?
Injection work is typically tracked by placed volume and pump output. Liters per hour aligns with batching, pump counters, and container sizes, making field tracking and reconciliation easier.
5) What does “severity” change in the estimate?
Severity applies a conservative multiplier and suggests a cycle count. Use “heavy” when collapse repeats, soil is loose, or activity continues. Use “light” for isolated, stable voids.
6) Can I price by kilogram if the supplier sells by bags?
Yes. Select cost basis per kilogram and enter your unit cost. The calculator converts volume to kilograms using density, then prices material consistently with bagged or bulk purchases.
7) Are the CSV and PDF exports safe to share?
They include only the inputs and results from your last run in this browser session. For records, save exports with a job name and date, and keep a copy with site notes.