Drilled Shaft Inspector's Manual, Second Edition, 2004-PDF

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The <strong>Drilled Shaft Inspector’s Manual</strong>, prepared jointly by ADSC and the Deep Foundations Institute, provides general guidance for inspecting drilled shaft construction. It is intended to support inspector training and should be supplemented by local engineering practice, project specifications, and site conditions.

The inspector’s primary role is to observe construction, keep accurate records, and determine whether work generally conforms to the plans and specifications—not to direct the contractor. Inspectors must understand the geotechnical report and design intent, recognize relevant soil and rock conditions, communicate promptly with the geotechnical engineer when conditions differ from expectations, and follow applicable safety requirements. Preconstruction preparation includes reviewing project documents, agreeing on communication and decision-making procedures, clarifying authority and payment records, and checking inspection and contractor equipment.

During excavation, inspectors monitor shaft position and plumbness, drilling methods, groundwater, caving, soil squeeze, bearing material, obstructions, rock removal, bells, and bottom cleanliness. They also observe casing, dewatering, and reinforcing-cage installation. Shaft entry carries serious hazards; the manual emphasizes topside inspection and requires strict compliance with safety regulations and procedures whenever entry is specified.

Concrete placement requires checks of water seepage, concrete mix and workability, and the suitability of dry placement versus tremie or pumping methods. For wet-hole construction, inspectors monitor slurry properties, bottom cleanliness, tremie setup and embedment, concrete levels and volume, and casing removal. They should watch for contamination, interruptions, cage movement, and discrepancies between actual and theoretical concrete volumes. Post-placement integrity testing may supplement—but not replace—thorough field observation.

The manual stresses complete, timely as-built reporting. Records should document shaft dimensions and elevations, materials encountered, groundwater, construction methods, casing, inspections and tests, concrete placement and quantities, delays, deviations, and decisions made. Clear documentation and prompt communication help address construction issues, support payment, and reduce disputes.
Keywords
drilled shaft inspection
deep foundations
construction monitoring
geotechnical report
shaft excavation
concrete placement
tremie method
slurry properties
as-built records
site safety