Post on 25-Dec-2021
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Ohio River Tunnel:Secant Pile Shafts
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CSO Concept
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Problems withCombined Sewer Overflows
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Nationwide CSOs
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Local Sewer Systems
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Overall Project Plan View
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Secant Pile Shaft Locations
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Tunnel Profile
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Tunnel Profile
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Secant Shaft Profiles
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Basic Design Concept
• Rigid Wall• Minimal deflection• Use Ko
• Water table• Ground surface
• Tolerance• Piles – 0.5%• Out of Round – 0.25%
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Effective Thickness
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Effective Thickness
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Effective Thickness
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Hoop Stresses
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Design: Finite Element Analysis
• FEM to analyze:• Unbalanced loading
• Crane• Conveyor Belt Footings
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Quality Control:Verticality Monitoring
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Quality Control:Concrete Strength
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Quality Control: Cores of Cores
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Quality Control: Concrete Volume
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Construction: Template
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Construction: Large Drill Rig, Casing and Support Equipment
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Construction: Overburden, Rock Drilling
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Construction: Weather Extremes
Winter – 0o Summer 100o
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Finished Face of Secant Piles
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Secant Pile Shafts: A Means to an End (or start of a Tunnel)
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Credits