Preparación / Preconstruction
Fase previa para reunir datos, acondicionar el terreno y organizar logística. Incluye estudios, replanteo, limpieza, accesos temporales, drenaje y provisión de servicios básicos para iniciar obra con control de riesgos.
Resumen de control del stage
Resumen de la etapa de preparación
Pre-construction is where projects quietly lock in expensive mistakes before concrete, waterproofing, or procurement even start. The main risk is not that nothing has been built yet; the main risk is that wrong survey control, weak site constraints analysis, poor access logic, and temporary drainage shortcuts distort every decision that follows. This stage should be treated as the decision-control layer for both builders and investors.
Quality gates del stage
- Freeze survey datum, control points, and drawing alignment before excavation, procurement, or setting-out starts.
- Verify slope, runoff, groundwater clues, and neighboring constraints as buildability inputs, not as generic site notes.
- Check heavy plant access, turning, working platforms, and delivery sequence against the actual construction method.
- Require temporary drainage and erosion control to be operable before the first major rain and before exposed soils multiply.
- Do not mobilize full production work without documented baseline data, protected benchmarks, and a site-constraints register.
Checklist por work package
This package decides whether the project is entering construction with real site intelligence or with assumptions. For both contractor margin and investor confidence, the priority is to expose slope, drainage, access, utility, and neighboring-property constraints before they mutate into change orders.
Qué verificar
- Confirm the baseline report clearly identifies slope, water, access, utility, and environmental constraints relevant to the chosen construction method.
- Separate verified facts from assumptions so unresolved risks are visible before pricing and mobilization decisions.
- Check that follow-up investigations are assigned with owners and dates rather than left as open narrative.
Qué suele salir mal
- Desktop assumptions are carried into production without enough field validation.
- Neighbor interfaces, easements, or utility corridors are discovered after the site plan is already fixed.
- The report describes the site but does not convert findings into operational constraints.
Survey control is not paperwork. It is the geometric truth that every foundation, wall line, drainage invert, and finish level will trust later. If datum transfer is weak here, downstream quality checks become false confidence.
Qué verificar
- Verify control points, coordinates, and benchmark protection before excavation or structure setting-out begins.
- Check design datum and field survey datum are aligned in the same coordinate and level logic.
- Confirm benchmark handover is understood by the team that will use it, not only by the survey consultant.
Qué suele salir mal
- Control points are technically issued but physically vulnerable and later disturbed.
- Datum mismatch is discovered only when structure or drainage levels stop making sense.
- Setting-out crews rely on copied marks without traceable benchmark confirmation.
Temporary water control is one of the most underestimated cost levers on tropical projects. It protects platforms, keeps survey control usable, and prevents the site from converting rain into delay and rework.
Qué verificar
- Review runoff paths on the real ground, not only on the layout drawing, before trenches and haul routes are opened.
- Confirm pumps, diversion routes, and silt control can survive peak short-duration rain rather than average weather assumptions.
- Inspect that temporary measures remain maintainable after other contractors occupy the site.
Qué suele salir mal
- Drainage is designed for drawings, not for the actual low points created by temporary roads and stockpiles.
- Silt control exists at setup but is not maintained after the first weather event.
- Overflow and pump discharge routes are improvised toward neighboring plots or completed works.
Evidencia antes de aprobar
- Signed baseline package with survey datum, benchmarks, site photos, and a constraint register.
- Documented acceptance of temporary access, drainage, and working-platform readiness before main mobilization.
- Protected control-point log and handover record from surveyors to delivery teams.
Glosario relacionado
Dificultad logística para entrada de personal y materiales.
Categoría geotécnica usada para factores de diseño.
Punto de referencia protegido para cotas y control posicional.
Traslado de ejes y geometría del proyecto al terreno.
Úselo con el resto del producto
Cambie entre stage guide, checklist y coste de errores. El mismo work package debe contar una historia coherente en las tres vistas.