ACI 533.1R-2020 Guide for Design and Construction Responsibilities for Architectural Precast Concrete.
The general contractor/construction manager generally has no direct design responsibility but does, however, have considerable impact on the design process through their coordination role. The general contractor/construction manager is responsible for coordinating the information necessary to allow the preparation of the precast concrete erection drawings as well as reviewing and securing approval for the shop drawings. samples, mockups, and range samples. The general contractor/construction manager receives the shop drawing submittals from the various trades and together they form the completed project design. The general contractor. construction manager is responsible for the timely transmission and resolution of requests for information. The general contractor/construction manager is normally responsible for project schedule and grid dimensions at each floor level (which includes control points, benchmarks, lines on the building, and work points for angled or curved building elevations) so all trades are working from uniform data and common reference points. Dimensional interfacing of the precast concrete with other materials and construction trades, and the maintenance of the structure’s specified tolerances to ensure proper fit. are also responsibilities of the general contractor/construction manager. The general contractor should notify the precaster and erector when as-built conditions (dimensions) of the structural framing vary beyond the tolerances stated on the contract documents. The general contractor.construction manager should also consider dimensional tolerances between interfacing materials, such as precast concrete units and glazing and other structural and cladding components.
The general contractor/construction manager should encourage direct communication between the precaster, the structural engineer of record, and the architect. Communications should he confirmed in writing and distributed to all parties to avoid misunderstandings.
3.4.1 .4rrachmen’ point layout— The general contractor is responsible for placing embedded items in cast-in-place concrete and coordinating steel attachments with the steel fabricator according to a layout or anchor plan supplied by the precaster or as designated on the contract documents. Typically, the most economical approach is to have required connection hardware attached to steel columns or beams by the steel fabricator. This necessitates awarding the precast concrete contract simultaneously with the steel contract so that early coordination between these trades can occur.
Changes in the panel-hearing surface and anchorage locations other than adjustments within prescribed tolerances require approval by the design team. During construction, the general contractor/construction manager should provide the precaster with as-built surveys of embedded items, anchor bolts, and other attached hardware, so that misaligned or missing hardware can he identified amid remedial actions undertaken by the general contractor/construction manager before erecting precast concrete units.ACI 533.1R pdf download.