GM Pontiac Substation W Equipment Floor Loading Issue
STATEMENT OF PROBLEM CCC received the substation equipment shop drawings from GM late in the project, at end of July. In August CCC worked with GM on the rigging plan for hoisting the new substation equipment into the penthouse. IBI performed a structural analysis of the penthouse framing steel and the hoist beam…
GM Pontiac A-line Existing Foundations
STATEMENT OF PROBLEM At bid time CCC received the 1950 Albert Kahn facility record drawings of the plant. This set had two foundation drawings, showing two different column foundation types for the plant. One drawing showed all footings, one drawing showed all caissons. It was unknown by GM which was the as-built…
GM Pontiac Process Utility Holes Over Press Pit
STATEMENT OF PROBLEM Once the press pit steel design was complete, CCC provided the pit framing steel model / 2D drawings to GM to provide to Rotem for their use. Rotem placed approximately 45 openings through the rebar SOD, and provided the 2D process drawing to GM/CCC. This drawing underwent 10 revisions by Rot…
GM Pontiac Scope Definitions
STATEMENT OF PROBLEM For utilities at A-line there were descrepancies between the scope demolition/relocation photos and the final direction. When a scope item calls for a utility at a column to be "secured to column" that does not mean "relocate". COURSE OF ACTION N/A LESSON LEARNED May be be…
GM Pontiac Establishing an Elevation of Top of Floor - Impact on Process
STATEMENT OF PROBLEM During design, elevations were taken along the existing A-line floor and along the MPS building. These elevations were used to average a finish floor level for the building addition. In original design, two die cart rails ran N-S from the die wash booth to A1-line. However after the construct…
GM Pontiac Press Pit Lighting Fixtures
STATEMENT OF PROBLEM The lighting fixture designed for the press pit and tunnel lighting went through IBI and GM approval and the photometric calcs were discussed several times. However prior to installation, the electrical subcontractor realized that the fixture was not listed in GM OneSpec. Triangle notified CC…
GM Pontiac Process (Press) Design Drawings coordination with Facility drawings
STATEMENT OF PROBLEM There were several issues to where the 2D press drawings provided by Rotem did not show enough detailed information for proper coordination. These included: 1) the press cable trays in pit 2) The platforms and ladders between the presses. 3) D/B team not having a useable press 3D…
Coordination of Mechanical Equipment & Site Structural Support Pads
STATEMENT OF PROBLEM: A coordination meeting between structural/civil/mechanical was held for the outdoor air rotation units which sit on concrete pads. In the meeting JEG gave the required dimensions of the pad and stated the ARU & pad should be centered within the building column bay. The pads were then designed b…
GM Pontiac Fire Alarm Design Review
STATEMENT OF PROBLEM The electrical subcontractor contracted Siemens to perform the fire alarm design. The drawings were submtited and reviewed by IBI and were also reviewed and approved by the city/fire department. However it was identified after the fact that the fire alarm drawings did not include smoke detect…
GM Pontiac Mechanical Equipment Control Wiring Design
STATEMENT OF PROBLEM There were significant delays in obtaining control wiring drawings from the mechanical subcontractor for the cooling tower, the ARUs, and the substation W HV units. This led to several delays with the electrical installation of the unit controls as the electrical subcontractor could not do an…
