What is a Culvert? Culvert Components Culvert Design and Construction Culverts – Pros / Cons
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Culverts • What is a Culvert? • Culvert Components • Culvert Design and Construction • Culverts – Pros / Cons
description
What is a Culvert? Culvert Components Culvert Design and Construction Culverts – Pros / Cons. What is a Culvert?. CHBDC Buried Structure Bridged Opening – 3m span Design – soil interaction AT Surrounded by Soil Below Road Parallel to Stream >= 1.5m DIA flow area. Culvert Components. - PowerPoint PPT Presentation
Transcript of What is a Culvert? Culvert Components Culvert Design and Construction Culverts – Pros / Cons
Culverts
• What is a Culvert?• Culvert Components• Culvert Design and Construction• Culverts – Pros / Cons
Culverts
What is a Culvert?
Culverts
CHBDC• Buried Structure• Bridged Opening – 3m span• Design – soil interactionAT• Surrounded by Soil• Below Road• Parallel to Stream• >= 1.5m DIA flow area
Culverts
Culvert Components
Culverts
Invert Streambed
Road
Rock
Bevel End
Cover
Burial(Embedment)
Elevation View
Crown(Obvert)
Clay Seal
Inlet Outlet
Barrel
Culverts
Plan View
Culverts
XS View
Rise
Span
Road
Burial(Embedment)
Cover
Haunch
CulvertsCulvert Shapes
EllipseRound
Arch Box
Culverts
Arch
Box
Round
Ellipse
Arch
Box
Round
Ellipse
Culvert Shape in AT System
Round
Ellipse
ArchBox
All (~2820) > 1999 (~380)
Ellipse BoxArch
Round
CulvertsCulvert Materials
SPCSPCSP
CIP PC Plastic
WSP
Culverts
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CulvertsCulvert Material in AT System
CIP
Precast
CSP
SPCSP
WSP
Plastic
SPCSP
CSP
CIP PC
PlasticWSP
CulvertsCulvert Size in AT System
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1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5
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Pipe Diameter (m)
CulvertsCulvert Age in AT System
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1950 1960 1970 1980 1990 2000 2010 2020
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Culverts
Culvert Design and Construction
CulvertsSoil Steel Structures – No backfill
CulvertsSoil Steel Structures – Compacted backfill
Culverts• Wide, Low Cover• Acts like Bridge• Costs like Bridge
Culverts
Pipe Arch
• High Stress• Compaction??
• Low Resistance• Bulging
Culverts
Culverts
OpenBottom
Culverts
Culverts
CulvertsBase Preparation
Culverts
NO CAMBER
CulvertsAssembly – Side Plates
CulvertsAssembly – Roof Plates
Check Dimensions Control Shape
CulvertsBackfill - Haunch
CulvertsBackfill - Sides
CulvertsConcrete End Treatment
Culverts
Culvert – Pros / Cons
CulvertsCost
Culvert = $1000/m2 * pi * L * DBridge = $4000/m2 * L * W
Culvert Bridge Ratio
D L Cost L W Cost
2 40 250,000 14 10 560,000 0.45
3 40 375,000 15 10 600,000 0.63
4 40 500,000 16 10 640,000 0.78
5 40 625,000 17 10 680,000 0.92
Culverts
Bridge Preferential Icing
Culverts
Bridge Barriers
Culverts
Unstable Valley Walls
Culverts
Need Soil Support
Culverts
Channel Work
Culverts
Blockage - Drift/Icing
Culverts
Pros ConsCost Need Soil SupportPreferential Icing Channel WorkNo Barriers Drift, IcingUnstable Valleys
Hydraulics, Fish Passage ????
Note: Selection of crossing structure is based on an optimization process involving assessment of a range of options (see Bridge Conceptual Design Guidelines)
