compute_manhole

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Free tier. Renders the MMHW standard only — CESMM4, NRM2 and SMM7 require a paid tier. Anonymous callers welcome. Composite assembly: precast concrete circular manhole with base slab, chamber rings (optional reducing slab + shaft), cover slab, frame & cover (BS EN 124 loading classes), step irons or ladder, in-situ benching with pre-formed channel, granular surround, geotextile separator, and excavation. Supports both open-battered and sheet-piled excavations. Example params: internal_diameter=1.5 m (1–3), wall_thickness=0.15 m (0.1–0.25), invert_depth=3.5 m (0.5–12). Example call: {"params": {"internal_diameter": 1.5, "wall_thickness": 0.15, "invert_depth": 3.5}, "standard": "MMHW"}. Omitted parameters use sensible engineering defaults. Pass deliverables=["xlsx","dxf","pdf"] (any subset) to also receive one-shot download URLs in the same call: Excel BoQ (both tiers, watermarked free) plus the dimensioned DXF (CAD) and PDF drawing sheets (paid tier).