Permanent Secant Pile Cut-Off Wall for UIHC Children’s ... · Secant Pile Walls (SPW) Definition:...
Transcript of Permanent Secant Pile Cut-Off Wall for UIHC Children’s ... · Secant Pile Walls (SPW) Definition:...
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Permanent Secant Pile Cut-Off Wall
for UIHC Children’s Hospital (CH) &
Parking Ramp No. 2 (HPR2)
Iowa City, IA
Schnabel Foundation Company
By: Mark Goudschaal, P.E.
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Presentation Overview
1. Owner/Project Team & Summary of
Work – Overall Plan and Facts.
2. Secant Pile Section and Soil Profile
3. Secant Pile Wall Procedures and
Installation.
4. Perm. Wall Const.
5. Conclusion
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Project Team
Owner:
University of Iowa Hospitals and Clinics
(UIHC)
Excavation/SiteworkContractor:
Peterson Contracting, Inc. (PCI)
SPW Contractor:
Schnabel Foundation Company (SFC)
DP Contractor:
Veit Companies
Architect/Engineer: Carl Walker, Inc. (HPR2) & Heery Design (CH) &
Shive Hattery
Geotechnical Engineer:
Terracon
Construction Manager:
Gilbane Construction Company (GCC)
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Existing Site – Prior to Construction
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Bid Package Plan/Work Sequencing
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Children’s Hospital & HPR2 Plan
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CH Temporary ERS – HPR2 S. SPW
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Children’s Hospital & Parking Ramp
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Soil Boring Locations
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UIHC CH & HPR2 Soil Borings
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SPW & ERS PLAN
Existing Caissons
Typical Section
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Typical SPW Section
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Ex. Parking Ramp Caisson Obstruction
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Secant Pile Walls (SPW)
Definition: SPW are formed by installing
overlapping piles to form a water cut-off.
1. First install primary piles.
2. Then install secondary piles within the
gaps and set reinforcing steel.
3. The difference in pile diameter and
spacing determines the actual overlap.
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Secant Piles: Hydraulic Piling Rig –Bauer BG28
BG28
Secant Pile Wall (SPW) - Plan and Verticality Tolerances are critical.
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Install SPW Templates
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Installed Circular Foam Template
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South SPW & Cap – Children’s
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SPW Drill Primary (Unreinforced) First
Concrete, f’c=3,000psi for Primary & Secondary Piles.
Secant Piles Hard-Hard Shafts
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HPR2 Drill More Primary Holes
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Secondary Holes – Pile Installation
I I I I I
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Finish Secondary Piles
I I I I I I I I I
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Casing Shoes and Tooling Repairs
New Casing teeth
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High Torque Rotary Casing
Thick walled sections of temporary
flush-joint steel casings (2 – 5 meter
lengths) with cutting teeth on starter
casing shoe.
Used with high torque rotary piling
equipment and/or casing oscillator.
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Oscillator Pulling Casing
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Flush-Joint Casing – Conical Bolts
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Placing Concrete & Pile
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Drilling and Setting Pile
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Crane Mat Access Road
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SPW Tie Connections
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Drilling 2nd Tier Permanent
Tiebacks
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Drilling Tiebacks – Using Uncoiler
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Automated Grout Plant
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Automated High Volume Grout Station
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Finished SPW - October 2013
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Current HPR2 & Childrens Hospital
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CH- April 2014 – Looking North
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ANY QUESTIONS/COMMENTS?