Verify Secant Pile Wall Concrete Classes Checklist
Definition: Verify secant pile wall concrete classes for primary/secondary assignments, specified strength classes, and overlap continuity, guiding site engineers and QA inspectors through practical acceptance criteria, records, and test evidence.
- Confirm hard and soft pile assignments match approved drawings and ITP.
- Verify concrete strength classes and testing align with project specifications.
- Check overlap continuity between adjacent piles to ensure watertight interlock.
- Interactive, commentable checklist with export and QR code verification.
Verify secant pile wall concrete classes is a focused quality-assurance checklist for confirming hard/soft pile assignments, strength classes, and overlap continuity in secant piling works. It supports site engineers and QA/QC teams verifying primary (soft) and secondary (hard) piles, concrete class compliance, and the continuity of the interlock between overlapping piles. The scope covers documentation, delivery ticket control, fresh concrete checks, sequencing, bite depth into primary piles, volume reconciliation, and compressive strength testing—while avoiding mix design re-engineering and structural design changes. By following these steps, teams reduce risks such as misassigned concrete classes, inadequate bite, loss of groundwater control, and nonconforming compressive strength that jeopardizes wall performance. Acceptance cues include verified design revisions, ticket-to-pile mapping, measured concrete properties, recorded cut-in depths, continuous pour logs, and test results tied to pile IDs. Use this interactive checklist to tick off tasks, add comments with photos, and export your evidence as PDF/Excel with a QR-secured audit trail.
- Ensure the correct hard/soft pile sequence, verify concrete strength classes per approved project specifications and authority requirements, and document overlap continuity so the wall achieves its intended structural and groundwater performance with traceable evidence.
- Control risks by mapping delivery tickets to pile IDs, logging fresh concrete tests and batch times, recording secondary pile bite depths into primaries, and trending compressive strength results to confirm consistent compliance across the wall alignment.
- Interactive online checklist with tick, comment, and export features secured by QR code.
Pre-Pour Documentation Review
Materials and Mix Verification
Drilling and Cage Placement Verification
Concreting and Overlap Continuity
Strength Class Compliance and Testing
Records and Sign-off
Getting the hard/soft assignments right the first time
Accurate hard/soft assignment is the backbone of a reliable secant wall. Primary (soft) piles are typically placed first to allow the secondary (hard) piles to cut in and form the interlock. Before any pour, confirm the latest approved drawings and the inspection and test plan, then map each pile ID to its designated concrete strength class. Control starts at the gate: the delivery ticket must match the intended pile type and class, and the batch time should support uninterrupted placement. Fresh concrete checks—temperature and slump/slump-flow—help verify workability and protect against segregation, especially when placing by tremie under fluid. Record every reading and capture photos of tickets and tests tied to the pile ID. Misassigned classes increase cutting difficulty or reduce long-term performance. A disciplined ticket-to-pile register and daily plan prevent mix mix-ups and sequencing errors that are costly to correct.
- Lock drawings, ITP, and pile-class map before pours.
- Ticket-to-pile register prevents class mix-ups on site.
- Record temperature and slump with time-stamped photos.
- Keep uninterrupted supply to avoid cold joints.
Proving overlap continuity between adjacent piles
Continuity relies on drilling alignment and deliberate cutting of the secondary pile into the green/soft primary. Verify tooling diameter and mast alignment to preserve the designed overlap. During secondary drilling, record cut-in depth into each adjacent primary and look for paste smear on tooling to evidence interlock. Compare actual vs theoretical concrete volumes; rises during secondaries often indicate cutting into primaries. Maintain continuous concreting and verify tremie embedment to avoid inclusions. Where access allows, capture photos at the bite zone or of spoil that demonstrates cutting through the primary. All evidence should be georeferenced to chainage and pile IDs so gaps can be rapidly identified and corrective actions planned while equipment is still mobilized.
- Log bite depth into primaries for every secondary pile.
- Use tooling smear photos as interlock evidence.
- Compare actual vs theoretical volume for continuity cues.
- Keep alignment within specified deviation limits.
Strength classes and testing tied to performance
Each concrete class must meet its specified compressive strength and fresh properties. Sample and label cubes/cylinders from each placement, curing them correctly and testing at defined ages. Correlate results to pile IDs and positions to spot localized issues. For primaries, verify the early-age window that permits effective cutting by secondaries, using maturity or penetration checks as stated in the method statement. Any nonconformity—failed strength, incorrect class delivered, or inadequate overlap evidence—should trigger investigation, containment, and documented corrective actions. Trend charts by chainage offer fast visibility of systemic issues such as batching variations or extended haul times affecting workability.
- Link test specimens to pile IDs and chainage.
- Meet specified fck for each class in MPa.
- Validate early-age condition before secondary cutting.
- Raise NCRs and trend results for patterns.
How to use this interactive secant wall verification checklist
- Preparation: Gather approved drawings, ITP, mix approvals, pile schedule, calibrated slump cone, thermometer, labels for specimens, PPE, and a camera/tablet. Confirm lab availability and concrete delivery sequence.
- Open the checklist: Start a new wall section by chainage, preload pile IDs and designated classes (soft/hard), and assign responsibilities to team members.
- During works: Tick items in real time, attach ticket photos, test results, and bite-depth readings. Use comments to flag issues and tag responsible parties for quick action.
- Sampling and tests: Record specimen IDs, curing location, and pickup times. Upload lab reports and link them to the correct pile IDs and concrete classes.
- Export and share: Generate PDF/Excel exports with embedded photos and timestamps. Use the QR code for on-site authentication and quick retrieval of the latest record.
- Sign-off: Capture digital signatures from contractor, consultant, and client. Archive the checklist and all evidence in the project QA repository.
Call to Action
- Start Checklist Tick off tasks, leave comments on items or the whole form, and export your completed report to PDF or Excel—with a built-in QR code for authenticity.
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