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Precast Concrete Circular Manhole Quantity Calculator
Precast concrete circular manhole with frame, cover, benching, and granular surround. Computes excavation, chamber rings, base slab, blinding, and disposal.
Slug · manhole · v1.0
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Precast Concrete Circular Manhole — a worked example, measured four ways
The same assembly at default dimensions, rendered as a Bill of Quantities under each measurement standard. Switch the standard to see how the bill changes. Change the inputs in the calculator to compute your own.
CESMM4 · 21 items · units sum, nr, m³, t, m²
| Code | Description | Unit | Quantity |
|---|---|---|---|
| A.4.1 | Provisional sum (Prime Cost): Frame & cover, D400 loading, 600mm clear opening, with 150mm adjustment rings | sum | 1 |
| A.4.1.fix | Fixing only: Frame & cover, D400 loading, 600mm clear opening, with 150mm adjustment rings | nr | 1 |
| E.4.3.5 | Excavation for foundations, maximum depth 2-5m | m³ | 105.54 |
| E.5.3 | Disposal of excavated material off-site | m³ | 7.36 |
| E.6.3.2 | Filling, imported selected granular material, Class 6N to SHW | m³ | 0.61 |
| E.6.2.1 | Filling, excavated material | m³ | 98.18 |
| F.1.1.1 | In-situ concrete blinding, C8/10, thickness 75mm | m³ | 0.26 |
| F.6.2.3 | In-situ reinforced concrete C32/40, manhole base slab | m³ | 0.69 |
| F.6.2.3 | In-situ reinforced concrete C32/40, manhole reducing slab (675mm opening) | m³ | 0.49 |
| F.6.2.3 | In-situ reinforced concrete C32/40, manhole cover slab | m³ | 0.09 |
| F.6.2.3 | In-situ reinforced concrete C32/40, manhole benching | m³ | 0.27 |
| G.5.1.4 | Reinforcement, high-yield steel bars to BS 4449 grade B500B, 12mm diameter, straight bars (BS 8666 shape 00; bar marks BS01, BS02) — preliminary schedule, confirm with detailed design | t | 0.08 |
| G.5.1.4 | Reinforcement, high-yield steel bars to BS 4449 grade B500B, 12mm diameter, straight bars (BS 8666 shape 00; bar marks CS03, CS04) — preliminary schedule, confirm with detailed design | t | 0 |
| G.5.1.5 | Reinforcement, high-yield steel bars to BS 4449 grade B500B, 16mm diameter, straight bars (BS 8666 shape 00; bar marks CS01, CS02) — preliminary schedule, confirm with detailed design | t | 0.01 |
| G.5.2.5 | Reinforcement, high-yield steel bars to BS 4449 grade B500B, 16mm diameter, bent bars (BS 8666 shape 41; bar marks CS05) — preliminary schedule, confirm with detailed design | t | 0 |
| G.5.1.3 | Reinforcement, high-yield steel bars to BS 4449 grade B500B, 10mm diameter, straight bars (BS 8666 shape 00; bar marks BN01, BN02) — preliminary schedule, confirm with detailed design | t | 0.02 |
| L.5.2 | Granular surround to pipe, 20mm single-size aggregate | m³ | 3.22 |
| K.1.1.3 | Precast concrete manhole, 1500mm internal diameter, depth to invert 3.5m | nr | 1 |
| K.8.1 | Galvanised step irons to manhole, 300mm centres | nr | 10 |
| K.5.1 | Pre-formed channel to manhole invert, 300mm diameter | nr | 1 |
| E.7.2 | Geotextile filter, 200 g/m², including laps | m² | 25.4 |
Procurement take-off: the total quantity to order of each material, from the same compute. Supplier-neutral, so you buy anywhere.
- Concrete Blinding0.26 m³
- Concrete Reinforced1.54 m³
- Disposal7.36 m³
- Excavation Foundation105.54 m³
- Fill General98.18 m³
- Fill Selected0.61 m³
- Geotextile Filter25.4 m²
- Manhole13 nr
- Manhole1 sum
- Pipe Surround3.22 m³
- Reinforcement0.1 t
Illustrative example at default dimensions · engine ref 40368c · not a tendered quantity