Three-Dimensional Skin, Rib, and Die Interconnection
A unified assembly-line manufacturing architecture for precast concrete modules of any type, characterised by three-dimensional skin, rib, and die interconnection designed in integrated 3D CAD and produced through three-dimensional manufacturing methods — scaling from immediate deployment at existing precast facilities (conventional welded rebar) through to full design-freedom production (additively manufactured ribs in die-cast skins), with a distributed Hub-and-Spoke deployment pattern enabling precision components to be manufactured centrally and concrete injected locally at any deployment site worldwide.
Conventional precast concrete production uses reusable formwork assembled on site, with separately fabricated welded steel reinforcement (rebar cages, mats, embedded plates) placed inside the formwork before concrete is poured. The formwork is stripped after cure, cleaned, and reassembled for the next pour. This architecture — essentially unchanged for over a century — has four fundamental limitations that prevent it from serving industrial-scale infrastructure production.
Cycle time is dominated by formwork stripping, cleaning, and reassembly: typically one cycle per mould per day for elements of significant size. Dimensional tolerance on embedded components (lifting inserts, post-tensioning ducts, threaded sockets, alignment dowels) is limited by wire-tie and steel-chair placement methods that cannot achieve production-line precision. Complex external geometry — interlinking joint surfaces, gasket grooves, cast-in rail fixings, integrated service channels — either cannot be produced at all in conventional reusable formwork or requires expensive multi-piece formwork with retractable inserts. And the architecture cannot be separated into a high-precision production stage and a local concrete-injection stage: the entire module must be poured and cured at a single location, requiring heavy finished concrete modules to be transported to the deployment site.
The patent introduces a unified manufacturing architecture for precast concrete modules characterised by three-dimensional skin, rib, and die interconnection. The architecture has six integrated enablers.
Integrated 3D CAD design as the architectural foundation. The cured module geometry is the design input, from which all production geometry — skin, rib, embedded component positions, registration features, engagement features, injection ports, air-removal ports, and master die geometry — is mathematically derived from a single source-of-truth 3D model. The master die geometry is reversed out as the negative of the skin geometry from the same model.
Skin/rib/die interconnection in three-dimensional space. The skin pieces (die-cast metal closures defining the module's external geometry), rib pieces (permanent structural elements embedded in the cured concrete, produced by any method from conventional welded rebar through to additively manufactured stainless steel), and master die geometry are designed together as a coordinated three-dimensional system. The rib performs three integrated functions through its contact with the skin: body strength (structural reinforcement), skin strength (supporting the thin die-cast skin against concrete injection pressure), and rib orientation (self-registering at engineered position through the skin's cast-in registration features).
Three-dimensional production methods for skins and ribs. Skins are die-cast at automotive cycle rates (60–120 seconds per cycle) with cast-in injection ports, air-removal ports, registration features, and engagement features as integral geometry. Ribs are produced by any metal-forming or fabrication method — conventional welded rebar (lowest capital cost), robotic fabrication, investment casting, die-casting, or additive manufacturing (best mode for complex modules). Cast-in jigsaw engagement features on skin edges provide fastener-free assembly and mechanical verification of correct fit.
Engineered strength distribution across the cured module, with heterogeneous strength characteristics tailored to the module's intended service requirement through coordinated specification of rib geometry, concrete grade, permanent skin zones, and embedded component locations.
Robotic factory line under unified computer control, comprising die-casting stations, rib production stations (which may be additive manufacturing, robotic fabrication, or conventional rebar stations per engineering choice), robotic assembly and joining, concrete injection, cure with parallel positions, skin separation, and closed-loop recovery of sacrificial skin metal — with the factory line achieving throughput approaching one finished module per minute per parallel production line.
Distributed Hub-and-Spoke manufacturing as a deployment architecture. The geometric precision elements — die-cast skin segments and rib pieces — are produced at a Primary Production Hub (Megafactory) and shipped in nested high-density form to Secondary Local Assembly Facilities (Spokes) proximate to deployment sites. Concrete is injected at the Spoke using local water, aggregate, and cement. The skin/rib/die interconnection architecture ensures that the Spoke-assembled module maintains the same engineered tolerance as a Hub-assembled module, with no precision instrumentation required at the Spoke — the cast-in jigsaw geometry of the skin segments either engages or it does not.
The drawing below illustrates the architectural primitives covered by this patent. Engineering specification and full claim language are available to qualified parties on direct request.
Two or more skin pieces are die-cast in metal (sacrificial, permanent, or reusable per engineering design). Where the module requires accessories — post-tensioning ducts, prestressing tendons, threaded couplers, anchor plates, lifting inserts, sensor mounts, electrical and hydraulic conduits, or any other standard precast accessory — a rib piece is produced (by conventional welded rebar fabrication, robotic fabrication, casting, or additive manufacturing as engineering choice) and the accessories are attached to the rib at precision-machined locations. The rib carries everything: structural reinforcement and all accessories. The skin pieces are assembled over the rib, with the skin's cast-in registration features locking the rib (and all attached accessories) at engineered three-dimensional position. Structural concrete is injected through engineered ports cast into the skin. After cure, the skin is removed (sacrificial skins by thermal melt-out or mechanical cut-and-peel; reusable skins by mechanical separation; permanent skins remain bonded as part of the finished module). The recovered sacrificial skin metal is returned to the die-casting station in closed loop.
For distributed Hub-and-Spoke deployment, skin pieces are designed in the integrated 3D CAD model as engineered nestable segments (for example, four to eight curved sub-panels for a 4-metre foundation ring). The segments nest concentrically for shipping container transport — multiple modules' worth of skin and rib components per container — and mate along their cast-in jigsaw edges during robotic assembly at the Spoke. The jigsaw engagement geometry provides both fastener-free mechanical closure and mechanical verification that the assembled skin conforms to the CAD source-of-truth. A module injected and cured at a remote Spoke maintains the same sub-millimetre tolerance as one produced at the Megafactory, because the tolerance is encoded in the Hub-produced metal components, not in the Spoke's operations.
The MMC Patent Family is an integrated platform; each patent in the family connects to the others. Patent 7 is the manufacturing architecture patent — it covers how the structural concrete modules of the other six patents in the family are produced at industrial scale. The patents most directly related to this one are:
All seven patents in the MMC Patent Family are Australian sovereign intellectual property. The architecture is offered to a global consortium structure that licences the standard to deploying nations and host industries. Engineering specification and full claim language are available to qualified parties on direct request via contact.