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.
Por qué este stage se encarece cuando se omite
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.
Errores caros en este stage
- Incomplete site analysis pushes surprises into foundation redesign, access rework, and emergency procurement after crews are already mobilized.
- Weak survey control causes axis and level drift that later appears as a structural or finishing problem, even though the error started before day one.
- Temporary drainage treated as a low-priority setup item leads to flooded work fronts, unstable platforms, and avoidable delay claims.
- Access planning based on optimistic assumptions forces ad hoc road strengthening, crane repositioning, and damage to completed temporary works.
- Under-scoped temporary utilities and storage create unsafe improvisation, theft exposure, and fragmented contractor productivity.
Escenarios de error vinculados
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.
Fallo probable
- 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.
Por qué cuesta más corregir tarde
Once contracts, plant bookings, and sequence assumptions are locked, correcting missing baseline intelligence affects design, procurement, access, and program all at once.
Señal de control
- 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.
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.
Fallo probable
- 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.
Por qué cuesta más corregir tarde
Late geometry correction is expensive because it contaminates excavation, structure, drainage, facade, and fit-out tolerances instead of staying inside one package.
Señal de control
- 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.
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.
Fallo probable
- 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.
Por qué cuesta más corregir tarde
When water starts controlling the site, teams lose productivity, working surfaces, and sequence reliability simultaneously; the fix becomes operational, civil, and contractual at the same time.
Señal de control
- 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.
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.
Convierta riesgo en acción
Abra el checklist vinculado antes del sign-off y vuelva al stage guide para mantener las decisiones alineadas con el presupuesto y el scope del work package.