Shop Drawings & BIM
In a system this precise, there is nothing left to guess.
Shop Drawing & BIM
At LEFF, Shop Drawing & BIM is a tightly integrated, end-to-end pipeline that turns architectural intent into fabrication-ready reality. We author coordinated BIM models in Revit with AGACAD for CFS automation, resolve geometry in Rhino when needed, validate constructability and sequencing in Navisworks, detail complex steel interfaces in Tekla, and publish crisp, installer-centric 2D sheets in AutoCAD. For stakeholder alignment, we produce immersive visual reviews via 3ds Max, Lumion, and Unreal Engine (true-scale VR).
The outcome: zero-guesswork drawings, machine-readable schedules, and site-ready assemblies that deliver predictability.
BIM Authoring (Revit + AGACAD)
LOD Strategy:
- LOD 300–350 for coordinated design (layouts, major sizes, fixing concepts).
- LOD 400 for shop-level detailing (member cut-lengths, fastener maps, punching, service openings, anchors).
- LOD 450 for assembly logic and erection sequencing metadata.
- LOD 500 for as-built reconciliation.
CFS Automation with AGACAD: Rule-based panelization (stud spacing, tracks, headers, jambs, bracing), automatic numbering, tag families, and parametric metadata (gauge, profile, coating, fire-rating, acoustic layer).
Parameter Schema: Shared parameters for Panel ID, Member ID, Level, Zone, Phase, Fire/Acoustic rating, Connection Type, Anchor Type, Hole Map, and Installation Sequence. All schedules and exports feed directly from these fields (single source of truth).
Geometry & Envelope: Free-form and complex envelopes are rationalized in Rhino, exchanged via IFC/SAT back to Revit for precise framing and bracketry.
Coordination & Constructability (Navisworks)
Clash Detection: Full ARC/STR/MEP coordination with actionable clash sets (hard, soft, clearance). Issues are tracked with owner/discipline, priority, and due date; clash-free issuance is a release gate for shop packages.
4D Sequencing: Construction sequence simulations (zones, levels, cores), crane pick planning, and logistics constraints—validated before any fabrication.
Field Tolerances: Defined tolerances for plumb/level/line, embed positions, and anchor set-outs are embedded in the model and pushed to the sheets.
Connection Detailing & Heavy Interfaces (Tekla)
Hybrid/Steel Nodes: Where CFS interfaces with hot-rolled steel, plates, angle seats, welded sub-assemblies, and tolerance stacks are modeled and checked in Tekla.
Code Conformance: Connection categories and fastener patterns documented to meet OBC/NBC requirements and the project’s engineer-of-record criteria.
Data Outputs, Schedules & CNC
BOM/Take-Offs: Panel schedules, member cut-lists, hardware lists, and pick lists generated natively from the model.
File Formats: DWG/DXF sheets; NWC/NWD for coordination; IFC for open exchange; NC/CSV where applicable for roll-forming or drilling.
Hole Maps & Service Integration: Pre-punched openings aligned with MEP routes; conflict-free paths documented on shop sheets to eliminate site drilling.
Shop Drawing Production
(AutoCAD + Revit Sheets)
Drawing Types:
Panel Elevations with member callouts, dimension strings, brace/strap layouts, and opening/freeze lines.
Connection Details (sill/track, jamb/header, splice, hold-down, anchor, diaphragm ties).
Hardware/Fastener Maps with counts per panel.
Anchor & Embed Layouts (coordinate-based set-outs and survey points).
Erection Plans (zone/sequence, rigging notes, handling).
Numbering & Traceability: Consistent ID schema (e.g., LV-03-Z2-PNL-145) appears on model objects, title blocks, BOMs, packing lists, and labels.
Issue Sets: IFI (Issue For Internal), IFM (Issue For Manufacture), IFC (Issue For Construction). Each issue logs revisions, clouds, and a change register referencing RFI/AHJ notes.
Quality Assurance & Issue Management
BIM-Driven QA/QC:
Parameter checks (required fields), geometry audits (member orientation, edge distances), and rule scripts (e.g., min bearing lengths, maximum stud spacing at openings).
Submittals & AHJ:
Permit-ready sets with calculation summaries; responses to AHJ comments tracked as formal revisions.
Change Control:
Every delta is logged (Rev ID, sheet index, description, approver), and model/sheet parity is verified before re-issue.
Visualization & Stakeholder Reviews
- Design Reviews: Photo-real previews via 3ds Max/Lumion; VR mock-ups in Unreal Engine for full-scale checks of stairs, cores, and service zones.
- Decision Acceleration: Visual evidence reduces owner ambiguity, compresses approval cycles, and locks decisions before fabrication.
Deliverables (Typical)
- Panel/shop drawings (DWG/PDF) with erection plans and details
- BOMs, member cut-lists, hardware schedules, packing lists
- Connection details (Tekla extracts + DWG details)
- Hole maps for MEP, anchor/embed layouts for survey
- 4D sequence snapshots/animations (Navisworks)
- Visualization pack (images, short walkthroughs, optional VR scene)
- As-built model and red-lined sheets at turnover