OAC Update, October 19, 2016

Actionable Items

Stair Seismic Detailing
Status:
[10/12/16] There is on-going coordination regarding the connection points, hand rails and structural implications of the “Grand Stair” (the exterior stair that leads up the west side of the building).
[10/19/16] The structural engineer provided details to the construction team during the OAC meeting illustrating  the required concrete embedding of stair handrails and the location of the metal panels.

HVAC Unit Placement
Status:
[10/12/16] Rooftop units are schedule to begin placement (pick date) on 11/15/16.  This date may need to be adjusted as the developer is planning on opening a portion of the new parking garage and access cannot be blocked unless previously approved in advance.
[10/19/16] The General Contractor and the Developer have agreed on 11/22/16 as being the first day that the rooftop HVAC units can begin placement on the roof.

AT&T Conduits
Status:
[10/19/16] A couple of  issues with the previously installed conduits for the incoming AT&T circuits have been brought up:  Pull boxes were not provided in the conduit run at maximum 100′ intervals and no conduit has been provided between the building floors.  The incoming conduit terminates at the floor of the garage level and conduit sleeves are provided through the first floor slab but no conduit has been provided between the two to protect the incoming cables.

Domestic Water Service
Status:
[10/19/16] The Developer is working on providing a schedule to the General Contractor to establish when the permanent domestic water service will be connected and operable for the store.  In the meantime the Developer is reviewing how and how much temporary water service can be provided to the store.

Tower Crane Deck Openings
Status:
[10/19/16] Now that the tower crane has been removed the openings on the floor decks need to be filled in.  Schedule forthcoming.

GC Update, October 14, 2016

The tower crane is completely disassembled and has been removed from the site.
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Slab openings, where the crane assembly once stood, remain open and await scheduling for in-fill.
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Structural steel is being marked and prepared for internal wall framing, ceiling and finish supports.
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Second floor concrete pours are underway
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Fireproofing of structural steel is being applied.
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Overall Progress Photos
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Electrical Rough-In, September 19, 2016

I saved this photo from the last batch of General Contractor progress photos to show what has recently become one of the first challenges that we as engineers need to assist in resolving.

While not immediately obvious this electrical rough-in is unacceptable for a number of reasons.

From a structural perspective this installation will not work as the conduits secured to the metal deck are too close to each other.  The Structural Engineer has dictated that no conduits shall be installed closer than 8″ to each other.  Having them too close prevents concrete from being properly poured into the metal pan.  Additionally, this density of conduits, which would be in the upper 1/3 of the final concrete pour, would present opportunities for surface cracking.

From a purely practical perspective this density presents issues for future repair and remodel work.  Sawcutting the floor is common in remodel work and the risk of cutting significantly more than what is desired is increased in area such as this.

As of this posting this issue is being addressed with the General Contractor to have the rough-in work corrected prior to the concrete pour.  Additional information may be forthcoming.

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Follow-Up: More Photos taken by the Structural Engineer on September 20, 2016.
All of these scenarios have been flagged as unacceptable and in need of removal prior to the concrete pour.
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GC Update, September 16, 2016

An overall shot of the project site.  The scaffolding and concrete work in the foreground is part of the Developer’s new parking garage structure.  The multi-level steel structure further back in the photo is the store that this web site is following the construction of.  To the left of of the store site you can see the old Macy’s which is at the end of the existing mall structure.160916_nordstrom_utc_361-site_progress_page_19

The General Contractor finally has a new “permanent” office trailer on site.  This is where all construction personnel will convene for the weekly OAC meetings and where the project design team is able to establish temporary office space while they are at the construction site.
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Concrete curb pouring is in progress.
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Preparing for the first floor slab pour. Reinforcing mesh installed.
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Metal stair installations nearing completion. After all steel assemblies are in completed concrete will be poured on the top of the metal structure to form to treads and landings. The risers will remain as uncovered painted steel.
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Adjacent Developer Construction Progress
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