{"actors":["Bridge erection engineers who define staged load paths and temporary stability requirements","Temporary-works designers who specify bracing, supports, connection sequences, and removal conditions","Site engineers and supervisors who direct lifts, closures, pours, stressing, and temporary-work changes","Surveyors and test technicians who report alignment, settlement, bolt tension, weld inspection, and concrete-strength evidence","Crane, steelwork, concrete, and temporary-works contractors who execute and report field transitions","Independent checkers and safety reviewers who assess deviations and hold-point evidence","The engineer of record and temporary-works coordinator who authorize stage transitions"],"affected_objective":"Maintain a trustworthy, time-specific account of the actual bridge erection state and its available load paths before authorizing each sequence-dependent construction transition.","arm":"ORDINARY_DIVERSE_P2","authority_safety":{"authorized_first_step":"The temporary-works coordinator may assemble a read-only shadow event ledger for one completed erection segment using archived shift reports, surveys, inspections, lift records, and hold-point releases; the ledger may not authorize or alter field work.","decision_authority":"The engineer of record, temporary-works coordinator, site safety lead, and applicable independent checker decide whether an event contract or projection may inform any controlled erection process.","excluded_actions":["Do not issue lift, brace-removal, stressing, loading, access, or hold-point instructions from the shadow projection.","Do not modify drawings, method statements, inspection records, survey reports, permits, or signed releases.","Do not infer that a connection, brace, support, or material-strength condition existed merely because the planned sequence required it.","Do not convert reported, inferred, disputed, or missing field assertions into verified occurrences without the existing adjudication process.","Do not collect continuous worker tracking, unrelated communications, or other personnel data beyond the evidence already authorized for construction assurance."],"halt_rollback":"Stop the exercise if ambiguous component identity, missing provenance, access violations, or replay disagreement could create a misleading load-path state. Discard the disposable projections, preserve a controlled discrepancy report, and leave all engineering and construction records unchanged."},"baseline":"Issued erection drawings, method statements, inspection and test records, survey reports, shift logs, nonconformance records, and hold-point releases remain authoritative in their existing systems; engineers reconstruct an actual stage by correlating their latest statuses, timestamps, and narrative references.","candidate_id":"event_log_centered_modeling__engineering_design__ORDINARY_DIVERSE_P2","causal_chain":["A bridge changes through sequence-dependent field happenings such as delivery, lift placement, temporary support installation, connection completion, concrete placement, strength confirmation, stressing, load transfer, survey acceptance, and brace removal.","The existing records primarily describe planned stages, current artifact status, or separate discipline observations, so the exact occurrence order, field context, participant roles, and knowledge time can remain fragmented.","A reported completion, late survey, corrected inspection, or undocumented temporary-work change can therefore alter the reconstructed stage without preserving which load-path assumptions were supportable at a particular hold point.","The intervention represents each consequential physical transition or evidence assertion as a bounded event with stable identity, affected components, explicit roles, dual time, location, transformation delta, provenance, uncertainty, and validity status.","A governed append-only ledger retains accepted assertions and linked corrections while separate physical-precedence, source-local, causal, and computational relations avoid manufacturing a false total chronology.","Pinned projectors replay the ledger to derive actual-stage, temporary-load-path, hold-point-evidence, and unresolved-transition views with visible frontiers and coverage limits.","Late or corrected evidence triggers a scoped rebuild of affected views while preserving the decision-time projection associated with the original release.","Rebuild-and-diff checks expose disagreement between the live stage view and canonical history, directing human investigation instead of allowing a manually patched projection to become independent truth."],"cell_id":"event_log_centered_modeling__engineering_design","consequence":"A stage transition can be evaluated against an inaccurate account of installed connections, active temporary supports, attained material strength, geometry, or transferred load, obscuring a sequence-dependent instability or complicating reconstruction after an anomaly.","diversity_from_prior_proposals":"This opportunity concerns transient structural stability during physical bridge erection: its problem is loss of the actual sequence-dependent field state, its intervention canonizes erection and load-transfer events, and its causal path runs from fragmented field observations through an incorrect temporary load-path projection to a potentially unsound stage transition. It does not address product-configuration qualification or reconstruct a design-release evidence basis.","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","intervention":"Create a governed erection-event ledger for one bridge construction segment. Define bounded event types for component receipt, lift placement, temporary support installation or adjustment, connection completion, weld or bolt inspection, concrete placement, strength evidence, stressing, survey observation, load application or transfer, brace removal, deviation report, hold-point release, correction, and adjudication. Each assertion carries a stable event ID; structure, component, support, connection, work-zone, and evidence references; participant roles; occurrence and record times; location and stage context; physical or evidentiary delta; provenance; uncertainty; and validity status. A validation gate quarantines malformed and duplicate assertions and makes acceptance idempotent. Corrections append linked retraction, supersession, compensation, or adjudication records. Physical precedence, claimed causality, source-local order, concurrency, and projector tie-breaks remain distinct. Versioned projectors derive the reconstructed erection stage, active temporary load path, hold-point evidence set, and unresolved-transition queue while displaying projector version, frontier, lag, source coverage, conflicts, and completeness limits. Late evidence rebuilds affected present-state views but preserves the view available when a hold point was released. Controlled replay and rebuild-and-diff checks test declared invariants, while access, retention, and redaction rules propagate to projections, indexes, and snapshots.","mechanism_mapping":[{"counterfactual_removal":"Without append-only event storage, a corrected survey, inspection, or support-status assertion could replace the state previously used at a hold point and erase decision-time context.","mechanism_slug":"append_only_event_store","role":"Preserves accepted erection transitions, evidence assertions, and their correction lineage as the scoped historical substrate."},{"counterfactual_removal":"Without separate occurrence and record times, a late-entered connection inspection or strength result could appear to have been known before a stage transition.","mechanism_slug":"bitemporal_event_register","role":"Distinguishes when a physical or evidentiary condition applied from when it was reported, accepted, corrected, or adjudicated."},{"counterfactual_removal":"Without a structured capture contract, shift notes and status changes could be mislabeled as events without a bounded transformation, affected components, or usable provenance.","mechanism_slug":"event_capture_template","role":"Requires identity, type, roles, time, place, transformation, provenance, uncertainty, and status for each erection assertion."},{"counterfactual_removal":"Without versioned event projections, the stage and temporary-load-path views would remain manually assembled summaries that could drift from the event history.","mechanism_slug":"event_sourced_projection","role":"Builds stage, load-path, hold-point, and unresolved-transition views from declared event inputs and ordering rules."},{"counterfactual_removal":"Without deduplication, repeated imports of inspections, lift reports, or support changes could multiply completion or load-transfer effects during replay.","mechanism_slug":"event_replay_deduplication","role":"Uses stable event identities and idempotent acceptance to prevent retries and overlapping records from changing the projected stage twice."},{"counterfactual_removal":"Without pinned replay, disagreement could not be isolated among missing events, schema interpretation, ordering rules, and projector behavior.","mechanism_slug":"deterministic_replay_protocol","role":"Reconstructs views using declared schemas, dependency semantics, projector versions, reference data, and structural invariants."},{"counterfactual_removal":"Without frontier visibility, an engineer could read a stage projection as complete despite an unprocessed survey, failed inspection feed, disputed support identity, or unrepresented shift record.","mechanism_slug":"projection_frontier_dashboard","role":"Displays projection lag, processed sources, unresolved corrections, conflicts, and known coverage gaps at the point of review."},{"counterfactual_removal":"Without rebuild-and-diff reconciliation, direct corrections to a convenient stage view could silently create a competing account of the structure.","mechanism_slug":"projection_rebuild_and_diff","role":"Compares the maintained view with recomputation from accepted erection history and routes discrepancies to governed review."}],"nearest_rivals":["Four-dimensional building-information modeling: associates model elements with planned or reported schedule states but is distinct unless bounded field events are canonical and every stage view is replayable from them.","Construction daily logs: preserve narrative observations by shift but may lack stable event identities, explicit transformations, correction lineage, partial-order semantics, and rebuildable projections.","Inspection and test plan with hold points: controls required checks and releases but does not necessarily reconstruct the complete physical stage and knowledge frontier from a common event substrate.","Digital twin for construction monitoring: can display estimated current geometry or condition, but differs when mutable model state or sensor estimates remain authoritative rather than governed events and versioned projectors.","Method-statement conformance checklist: compares work with a prescribed sequence but does not by itself preserve late evidence, competing assertions, decision-time states, or deterministic replay."],"negative_tests":{"intervention_falsifier":"The intervention is falsified for the pilot if a pinned projector cannot reconstruct the documented stage and active temporary supports at the selected historical hold point, or if it detects seeded duplicate, late, superseded, and conflicting field assertions no more clearly than the existing reconstruction process.","problem_falsifier":"The problem is falsified for the selected segment if existing controlled records already produce, without discretionary interpretation, the exact installed-component, connection, support, geometry, strength, load-transfer, correction, and knowledge state for every consequential hold point.","risks":["Field-event capture may add burden and encourage superficial completion reporting.","An incomplete ledger may create unwarranted confidence in a complete-looking structural stage.","Incorrect component, connection, or temporary-support identity may produce a false load path.","A computational tie-break may be mistaken for physical precedence or causality.","Narrative reports may lack enough evidence to define bounded transformations reliably.","Projector or schema errors may yield plausible but incorrect stage reconstructions.","Detailed activity histories may expand worker surveillance, contractual exposure, or access to sensitive project information.","Unlogged adjustments, informal coordination, or unavailable subcontractor records may be mistaken for non-occurrence.","Teams may patch a stage projection during schedule pressure, allowing it to become an undeclared authority."],"strongest_counterevidence":"Signed hold-point packages, surveyed as-built models, inspection records, and disciplined temporary-works registers may already preserve every decision-relevant stage transition; reconstruction difficulty could instead reflect failure to follow established field-control procedures."},"next_evidence_step":"Conduct a read-only reconstruction of one completed bridge erection segment and one historical hold-point release. Sample no more than 45 archived lift, connection, inspection, concrete-strength, stressing, survey, temporary-support, deviation, and release records. Define the event contract, explicit precedence relations, and one pinned stage projector. Test four fixtures: a duplicate inspection import, a late survey, a superseded support-status report, and a disputed connection identity. Compare the replayed physical stage, active temporary supports, evidence set, exclusions, and frontier with the signed hold-point package; record ambiguous transformations, missing provenance, replay disagreement, capture effort, and access concerns. Do not use the result for construction control.","observable_state":"For a completed bridge erection hold point, engineers can inspect issued sequence drawings, shift reports, inspection results, surveys, and releases, yet cannot obtain from one governed source a replayable view of which components, connections, temporary supports, strength conditions, and load transfers were asserted, verified, disputed, superseded, missing, or not yet recorded at the release time.","prior_art_status":"UNSEARCHED","problem":"During staged bridge erection, structural stability depends on the actual sequence of component placement, connection completion, temporary support changes, material-strength attainment, stressing, geometry correction, and load transfer. These facts are distributed across drawings, shift reports, inspection systems, surveys, test records, and hold-point forms that emphasize planned stages or current statuses. When work occurs concurrently, reports arrive late, or field assertions are corrected, engineers may be unable to reproduce the precise physical and evidentiary state that supported a past or proposed stage transition.","proposal_index":2,"remaining_contrastive_claim":"Even if a project already uses four-dimensional models, digital twins, daily logs, and electronic hold-point workflows, this candidate remains structurally distinct only if bounded erection and evidence assertions become the governed historical substrate and stage, load-path, and decision-time views are frontier-visible projections that can be discarded and rebuilt without editing that history.","revision_record":{"claim_changes":["Initial candidate; no claims of novelty, prevalence, demand, or effect size are made."],"conceptual_changes":["Initial formulation applies event-centered modeling to transient bridge-erection state and temporary load-path assurance."],"evidence_changes":["No external evidence or prior-art search was used; empirical status remains untested."],"operational_changes":["The authorized first step is limited to a read-only shadow reconstruction of one completed erection segment and one historical hold point."],"parent_version":null,"progress_targets_addressed":["Specified a problem, intervention, affected objective, and causal path materially separate from configuration-specific design qualification.","Mapped canonical events, dual time, append-only correction, explicit ordering, projection frontiers, replay, and reconciliation into staged construction.","Specified decision authority, exclusions, rollback conditions, falsifiers, risks, counterevidence, and a bounded next evidence step."]},"schema_version":1,"structural_mapping":[{"archetype_element":"Bounded canonical event assertion","domain_realization":"A component placement, support change, connection completion, inspection, concrete placement, strength result, stressing, survey, load transfer, brace removal, deviation, release, correction, or adjudication with a defined physical or evidentiary delta."},{"archetype_element":"Stable event and participant identity","domain_realization":"Persistent references for events, bridge segments, members, connections, bearings, temporary supports, work zones, evidence records, organizations, and responsible roles, with uncertain matches and merge or split lineage preserved."},{"archetype_element":"Event time and record time","domain_realization":"Separate intervals for when a field transition or condition occurred or applied and when it was observed, entered, verified, corrected, or adjudicated."},{"archetype_element":"Participant-role, place, and transformation binding","domain_realization":"Each event identifies actors such as executor, witness, inspector, surveyor, reviewer, and releaser; locates the work within the structure and erection stage; and states the support, connection, geometry, strength, or load-transfer change."},{"archetype_element":"Governed append authority and validation gate","domain_realization":"Authorized source adapters and designated project roles append assertions within defined scopes; identity, provenance, schema, access, transformation, and idempotency checks reject or quarantine invalid submissions."},{"archetype_element":"Explicit ordering and concurrency","domain_realization":"Physical prerequisites, claimed causal links, source-local sequences, concurrent activities, and computational tie-breaks are represented separately rather than collapsed into one timestamp order."},{"archetype_element":"Correction and supersession lineage","domain_realization":"A corrected survey, withdrawn inspection, revised support status, or adjudicated deviation appends a linked assertion while preserving the state of knowledge at earlier hold points unless governed redaction is required."},{"archetype_element":"Versioned projection definition","domain_realization":"Pinned projectors declare included event types, component and stage bindings, precedence semantics, evidence-status treatment, output contracts, and uncertainty behavior for physical-stage, temporary-load-path, hold-point, and unresolved-transition views."},{"archetype_element":"Projection frontier and completeness statement","domain_realization":"Each view reports processed shifts and sources, latest accepted events, lagging surveys or inspections, unresolved identities, excluded records, and known categories of unlogged field work."},{"archetype_element":"Replay, late-event handling, and reconciliation","domain_realization":"Late evidence rebuilds affected current-stage projections while retaining the original decision-time view; deterministic replay and rebuild-and-diff checks compare projections with accepted history and declared structural invariants."},{"archetype_element":"Retention, redaction, and access control","domain_realization":"Purpose-scoped rules protect personnel, commercial, and safety-sensitive information, propagate corrections or redactions to derived forms, and retain only the reconstruction horizon authorized for construction assurance."}],"title":"Replayable Temporary Load-Path State for Staged Bridge Erection","version":0}