{
  "revision": "18.8 / secciones 18.6",
  "date": "2026-10-13",
  "status": "Anteproyecto, no liberado para fabricar o trepar",
  "primary_project": "Chakana de madera de 3 m",
  "source_pdf": "Tabla Materiales Inercia (2).pdf, tubos cuadrados, páginas impresas 34–37",
  "section_kg_per_m": {
    "50x50x3.2": 4.495,
    "80x80x3.2": 7.51
  },
  "steel_nominal_kg": 289.365,
  "plywood_assumed_kg": 13.057,
  "model_nominal_kg": 302.422,
  "steel_purchased_kg": 332.85,
  "mass_by_type_kg": {
    "M01": 14.592,
    "M02": 21.832,
    "M03": 30.59,
    "M04": 8.758,
    "M05": 11.715,
    "M06": 18.955,
    "M07": 9.477,
    "M08": 64.368,
    "M09": 19.674,
    "M10": 45.06,
    "M11": 21.348,
    "M12": 9.043,
    "M19": 13.057,
    "M20": 8.379,
    "M21": 5.574
  },
  "bultos_nominal_kg": {
    "A": 157.74,
    "B": 144.683
  },
  "stock_nesting": {
    "50x50x3.2": [
      {
        "bar": 1,
        "used_mm": 5892.532,
        "cuts": [
          {
            "type": "M11",
            "length_mm": 2374.658
          },
          {
            "type": "M11",
            "length_mm": 2374.658
          },
          {
            "type": "M03",
            "length_mm": 1134.216
          }
        ],
        "remaining_mm": 87.468
      },
      {
        "bar": 2,
        "used_mm": 5928.862,
        "cuts": [
          {
            "type": "M09",
            "length_mm": 2188.431
          },
          {
            "type": "M09",
            "length_mm": 2188.431
          },
          {
            "type": "M03",
            "length_mm": 1134.216
          },
          {
            "type": "M01",
            "length_mm": 405.784
          }
        ],
        "remaining_mm": 51.138
      },
      {
        "bar": 3,
        "used_mm": 5934.864,
        "cuts": [
          {
            "type": "M03",
            "length_mm": 1134.216
          },
          {
            "type": "M03",
            "length_mm": 1134.216
          },
          {
            "type": "M03",
            "length_mm": 1134.216
          },
          {
            "type": "M03",
            "length_mm": 1134.216
          },
          {
            "type": "M06",
            "length_mm": 1054.216
          },
          {
            "type": "M05",
            "length_mm": 325.784
          }
        ],
        "remaining_mm": 45.136
      },
      {
        "bar": 4,
        "used_mm": 5760.648,
        "cuts": [
          {
            "type": "M06",
            "length_mm": 1054.216
          },
          {
            "type": "M06",
            "length_mm": 1054.216
          },
          {
            "type": "M06",
            "length_mm": 1054.216
          },
          {
            "type": "M20",
            "length_mm": 932.0
          },
          {
            "type": "M20",
            "length_mm": 932.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          }
        ],
        "remaining_mm": 219.352
      },
      {
        "bar": 5,
        "used_mm": 5752.0,
        "cuts": [
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          }
        ],
        "remaining_mm": 228.0
      },
      {
        "bar": 6,
        "used_mm": 5752.0,
        "cuts": [
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          }
        ],
        "remaining_mm": 228.0
      },
      {
        "bar": 7,
        "used_mm": 5843.432,
        "cuts": [
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M08",
            "length_mm": 716.0
          },
          {
            "type": "M21",
            "length_mm": 620.0
          },
          {
            "type": "M21",
            "length_mm": 620.0
          },
          {
            "type": "M02",
            "length_mm": 607.108
          },
          {
            "type": "M02",
            "length_mm": 607.108
          },
          {
            "type": "M02",
            "length_mm": 607.108
          },
          {
            "type": "M02",
            "length_mm": 607.108
          }
        ],
        "remaining_mm": 136.568
      },
      {
        "bar": 8,
        "used_mm": 5949.864,
        "cuts": [
          {
            "type": "M02",
            "length_mm": 607.108
          },
          {
            "type": "M02",
            "length_mm": 607.108
          },
          {
            "type": "M02",
            "length_mm": 607.108
          },
          {
            "type": "M02",
            "length_mm": 607.108
          },
          {
            "type": "M07",
            "length_mm": 527.108
          },
          {
            "type": "M07",
            "length_mm": 527.108
          },
          {
            "type": "M07",
            "length_mm": 527.108
          },
          {
            "type": "M07",
            "length_mm": 527.108
          },
          {
            "type": "M04",
            "length_mm": 487.108
          },
          {
            "type": "M04",
            "length_mm": 487.108
          },
          {
            "type": "M01",
            "length_mm": 405.784
          }
        ],
        "remaining_mm": 30.136
      },
      {
        "bar": 9,
        "used_mm": 5734.408,
        "cuts": [
          {
            "type": "M04",
            "length_mm": 487.108
          },
          {
            "type": "M04",
            "length_mm": 487.108
          },
          {
            "type": "M01",
            "length_mm": 405.784
          },
          {
            "type": "M01",
            "length_mm": 405.784
          },
          {
            "type": "M01",
            "length_mm": 405.784
          },
          {
            "type": "M01",
            "length_mm": 405.784
          },
          {
            "type": "M01",
            "length_mm": 405.784
          },
          {
            "type": "M01",
            "length_mm": 405.784
          },
          {
            "type": "M05",
            "length_mm": 325.784
          },
          {
            "type": "M05",
            "length_mm": 325.784
          },
          {
            "type": "M05",
            "length_mm": 325.784
          },
          {
            "type": "M05",
            "length_mm": 325.784
          },
          {
            "type": "M05",
            "length_mm": 325.784
          },
          {
            "type": "M05",
            "length_mm": 325.784
          },
          {
            "type": "M05",
            "length_mm": 325.784
          }
        ],
        "remaining_mm": 245.592
      }
    ],
    "80x80x3.2": [
      {
        "bar": 1,
        "cuts": [
          {
            "type": "M10",
            "length_mm": 3000
          }
        ],
        "remaining_mm": 2977
      },
      {
        "bar": 2,
        "cuts": [
          {
            "type": "M10",
            "length_mm": 3000
          }
        ],
        "remaining_mm": 2977
      }
    ]
  },
  "materials": [
    {
      "rubro": "Caños",
      "item": "50×50×3,2 mm · barra 6 m",
      "quantity": 9,
      "unit_price_ars": 75449.66,
      "subtotal_ars": 679047,
      "price_type": "publicado, stock por confirmar",
      "source": "https://chapaferro.com.ar/producto/cano-est-cuadrado-50-x-50-x-3-2/"
    },
    {
      "rubro": "Caños",
      "item": "80×80×3,2 mm · barra 6 m",
      "quantity": 2,
      "unit_price_ars": 124477.15,
      "subtotal_ars": 248954,
      "price_type": "publicado, stock por confirmar",
      "source": "https://chapaferro.com.ar/producto/cano-est-cuadrado-80-x-80-x-3-2/"
    },
    {
      "rubro": "Chapas",
      "item": "Placa base 240×240×10 mm",
      "quantity": 2,
      "unit_price_ars": 35000,
      "subtotal_ars": 70000,
      "price_type": "provisión",
      "source": ""
    },
    {
      "rubro": "Tablero",
      "item": "Fenólico 18 mm para mesa",
      "quantity": 1,
      "unit_price_ars": 60000,
      "subtotal_ars": 60000,
      "price_type": "provisión",
      "source": ""
    },
    {
      "rubro": "Uniones",
      "item": "Pernos, placas de empalme y arandelas",
      "quantity": 1,
      "unit_price_ars": 140000,
      "subtotal_ars": 140000,
      "price_type": "provisión",
      "source": ""
    },
    {
      "rubro": "Protección",
      "item": "Preparación y acabado exterior",
      "quantity": 1,
      "unit_price_ars": 95000,
      "subtotal_ars": 95000,
      "price_type": "provisión",
      "source": ""
    }
  ],
  "materials_total_ars": 1293001,
  "optional_services": [
    {
      "item": "Taller, soldaduras, plantillas y control",
      "allowance_ars": 650000
    },
    {
      "item": "Dos cunas/racks reutilizables",
      "allowance_ars": 150000
    },
    {
      "item": "Flete y descarga",
      "allowance_ars": 300000
    }
  ],
  "materials_plus_allowances_ars": 2393001,
  "truck_assumed_clear_width_mm": 2400,
  "bulto_envelope_each_mm": [
    3000,
    1500,
    961
  ],
  "transport_note": "Dos mitades volumétricas, 3+3 barras transversales y mesa estibadas dentro de los bultos. Profundidad máxima de modelo 961 mm por riostras y placas posteriores; agregar cuna/embalaje y confirmar gálibo/descarga. Masa excluye soldaduras, uniones y embalaje. La alternativa de 4 paneles planos está en transporte_4_paneles.json; ambos esquemas excluyen herrajes y embalaje.",
  "excluded": [
    "Cálculo/firma estructural",
    "uniones y soldaduras especificadas",
    "plataformas, acceso y protección contra caída",
    "anclajes según viento y suelo",
    "IVA y flete real",
    "Dos placas de pie adicionales para las riostras y sus fundaciones",
    "Herrajes finales para las 52 interfaces de campo de la alternativa de cuatro paneles"
  ],
  "joint_alternatives_estudy_only": {
    "2_volumes": {
      "field_joints": 12,
      "plates_100x100x8": 24,
      "plates_nominal_kg": 15.072,
      "m12_bolts": 48,
      "nuts": 48,
      "washers": 96
    },
    "4_panels": {
      "field_joints_minimum": 52,
      "plates_100x100x8": 104,
      "plates_nominal_kg": 65.312,
      "m12_bolts": 208,
      "nuts": 208,
      "washers": 416
    },
    "note": "No incluidos en masa/modelo ni cotización real; cantidades condicionales a geometría sin cálculo. La provisión de ARS 140.000 no representa costo comprobado."
  }
}