At the end of a work of microtunneling or pipe jacking, In order to ensure the quality of the work, technical documentation must be provided to verify what has been executed, with what materials, under what controls and with what final results. This documentation is used for acceptance of the work, future operation, maintenance, quality traceability and contractual closure.
In projects of pipe ramming y microtunneling in terrestrial and subway applications, The final documentation may vary according to the contract, the client, the project management and the type of infrastructure, but normally includes as-built drawings, progress records, topographical controls, quality, safety and environmental documentation.
Standard closeout documentation
As-built or final as-built drawings: They include the final position of the pipeline, elevations, alignment, slope, manholes, connections, approved changes and elements actually constructed. They are essential for future operations, maintenance or network extensions.
Topographic report and alignment control: includes checking the axis, elevation, slope, entry and exit points, deviations from the design and verifications made during execution. In works with demanding layouts, this control is key to validate the accuracy of the microtunnel.
Progress records and excavation parameters: may include dates of progress, lengths executed, thrust, torque, working pressures, incidents, stoppages, terrain changes, lubrication consumption, slurry management or specific data on the system used, especially in works with EPB tunnel boring machine o hydro shield.
Certificates and traceability of materials: documentation of pipes, joints, voussoirs if applicable, mortars, lubricants, auxiliary elements, manufacturing certificates, technical data sheets and tests required by the project or applicable regulations.
Testing and quality control: tightness tests, dimensional checks, joint control, interior inspections, material reception records, non-conformities, corrective actions and evidence of compliance with the quality plan.
Health and safety documentation: HSE records, safety reports, work permits, inspections, specific training, access controls, protocols applied, incidents and preventive measures implemented during execution.
Environmental documentation: management of waste, sludge, pumping water, excavated material, environmental protection measures, removal records, authorizations, discharge controls if applicable, and compliance with the project's environmental conditions.
Report of incidents and lessons learned: summary of deviations, approved changes, constraints encountered, solutions adopted and recommendations for operation, maintenance or future phases of the project.
Final quality dossier or work dossier: an orderly grouping of drawings, reports, certificates, tests, records, relevant communications and contractual documentation necessary for the formal acceptance of the work.
Why this documentation is important
The final documentation not only proves that the work has been executed. It also allows to know the real behavior of the terrain, to verify the accuracy achieved, to justify changes, to facilitate audits, to plan maintenance and to reduce uncertainties in future interventions on the infrastructure.
At infrastructure crossings, The final dossier is particularly important because it provides technical traceability of the action and facilitates coordination with network managers, administrations, utilities or main contractors.
Minimum checklist of final documentation: as-built drawings, topographic report, progress log, excavation parameters, material certificates, quality tests, HSE documentation, environmental management, incidents, non-conformities, approved changes and final construction dossier.
Request information about the technical documentation and site closure in trenchless projects to define the necessary deliverables from the offer phase.
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