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Transbay Transit CenterCAC Presentation
Early Below Grade Package14 February 2012
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EARLY BELOW GRADE PROCESS
• Currently executing the Buttress and Shoring Package
• Objectives
o To include the substantial majority of below grade structural concrete
work
o Provide waterproofing for the mat slab and foundation walls
o Incorporate cast‐in elements for pipes, electrical and structural items
o Incorporate a major seismic joint
o Accommodate bracing and construction equipment platform (trestle)
o Accommodate dewatering
o Accommodate utility penetrations
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Shoring, Foundation & Train Box
Mat Foundation
Shoring Wall
Tie-downs
Water table
B12
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Slide 3
B12 animate this slide to sequentially show:1. shoring walls2. Mat slab (& shoring)3. Lower concourse and columnsTHEN ON A NEW SLIDE:4. Steel frame & concrete ground floor slab5. Steel superstructure
SHOW SHORING WALLS IN SAY BLUE, CONCRETE IN GREY; STEELWORK IN RED PRIMERBGibbons, 9/15/2011
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• Once the shoring wall is installed, excavation begins.
• 2250 Micropile tie‐downs are installed and site dewatering commences.
• Then the Below Grade Package gets underway : which includes a 5ft thick Mat slab and 3ft thick Foundation walls running the full length of the site
Currently executing the Buttress and Shoring Package
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To Include The Substantial Majority Of Below Grade Structural Concrete Work
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Provide Waterproofing For The Mat Slab And Foundation Walls
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Incorporate Cast‐in Elements For Pipes, Electrical And Structural Items
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Incorporate a Major Seismic Joint
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Accommodate Bracing And Construction Equipment Platform (Trestle)
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Accommodate Dewatering
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Accommodate Utility Penetrations
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EARLY BELOW GRADE DRAWINGS
• Approximately 450 drawings in the package
• Consultant drawings and specifications
o Structural
o Architectural
o Mechanical
o Electrical
o Plumbing
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Scope of Early Below Grade Package
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STRUCTURAL
• Concrete Mat slab
• Foundation walls
• Concrete structural columns
• Water storage tanks
• Vehicle and Bike Ramps
• Tiedowns
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Water Storage Tanks
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Vehicle and Bike Ramps
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2300 Tiedowns
• Installed in BSE package
• Top of micropiles cast in to Mat slab to hold down building
• Building expected to rise due buoyancy 1 1/2"
• Returns to rest after building is fully loaded
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ARCHITECTURAL
• Slab edge drawings
o Locations of slab opening for stairs, escalators and elevators
o Opening locations for drains, sumps, pipes and major conduits
• Room layouts
o Provide location of reinforcing for future rooms
• Waterproofing
• Seismic joint
• Cast in channels
o Support of future MEP items
o Support of ceilings
o Support of future overhead catenary power system for trains
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Seismic Joint
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MECHANICAL
• Geothermal loop system
ELECTRICAL
• Cast in boxes and conduits
• Grounding system
PLUMBING
• Cast in pipes and sleeves for future pipes
• Sump pits and drains
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Geothermal Loop System
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Sump Pits and Drains
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t3
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Slide 28
t3 Do not animatettuser, 9/21/2011