chincoteague project overview presentation goals

1

HARDESTY & HANOVER, LLPE N G I N E E R I N G

Virginia Concrete Conference, Chincoteague Project Overview

Chincoteague Project Overview


Henri Sinson, PE

Virginia Concrete Conference

March 6, 2008

Long Life Aspects



Presentation Goals

• Project Overview• Site Conditions• Scope• Alignment• Constructability

• Bascule Span Highlights• Approach Substructure

• Satisfied Aesthetic Requirements• Satisfied Subsurface Conditions• Details for Long Life

• Approach Superstructure• Satisfied Aesthetic Requirements• Details for Long Life• Innovation for Efficiency• Innovation for Long Life



Project Overview

• Bridge on Rte 175 Over Black Narrows and Lewis Creek Channel

• Accomack County and Town of Chincoteague, Virginia

• 4035’-0” low level bridge

• 123’-6” single leaf bascule span

• 729’-0” low level connector bridge

• Owner: VDOT

• Designer: Hardesty & Hanover, LLP

• Contractor: American Bridge

• Contractor Bid: $68.7 million



Site Conditions

Town of Chincoteague & Marsh IslandOld Chincoteague Bridge



Site Conditions

Mar

sh Is

land

Chinco

teague I

sland

Cha

nnel

Old ChincoteagueSwing Bridge

Old BlackNarrows Bridge

Site Plan



Scope

Mar

sh Is

land

Chinco

teague I

sland

Cha

nnel

4035’-0”

Old ChincoteagueSwing Bridge

729’-0”

Old BlackNarrows Bridge

New SingleLeaf BasculeNew Rte 175 Bridge

New Marsh IslandConnector Bridge

Site Plan

2



Alignment

Mar

sh Is

land

Chinco

teague I

sland

Cha

nnel

4035’-0”

729’-0”

Site PlanNew SingleLeaf BasculeNew Rte 175 Bridge




Constructability

Mar

sh Is

land

Chinco

teague I

sland

Cha

nnel

4035’-0”

729’-0”

Site PlanNew SingleLeaf BasculeNew Rte 175 Bridge




Bascule Span

• 92’-0” Span Length• Closed Pit Pier• 5” Half filled grating• 1662 Kip Leaf• 26” Trunnion Diameter• Gear Driven• 75 HP, 900 RPM Primary



Bascule Span



Bascule Span



Bascule Pier

3



Bascule Pier Deck Removed



Bascule Pier Stringers Removed



Bascule Span Removed



Approach Substructure

Mar

sh Is

land

Chinco

teague I

sland

Site Plan

Cha

nnel

New SingleLeaf BasculeNew Rte 175 Bridge





Mar

sh Is

land

Chinco

teague I

sland

Bents 1-49

Bents 50-59

Site Plan

Cha

nnel



Substructure Aesthetics

Typical Trestle Bent

4



Substructure Aesthetics

Cylinder Pile Bent



Subsurface



Substructure Details

Bent Elevation



Substructure Details

43’-4”

12’-0” 12’-0” 12’-0”

Prestr.CylinderPile

CIP Pile Cap

Cheekwall

4’-6”

4’-2”

Prestr.CylinderPile

PileSection

3’-0”

BentSection

Bent Elevation






Approach SubstructurePhoto Courtesy of Jacobs Engineering Group Inc.

5



Approach Superstructure

“Baseline” Bridge Elevation



Superstructure Aesthetics

Addition of Cheekwalls



Superstructure Aesthetics

Addition of Arched Fascia Beams



Superstructure Details

80’-0” 80’-0” 80’-0” 80’-0”

4 Span Continuous Unit

Framing Plan

Prestr.Bulb-T

Prestr.FasciaBeam



Superstructure Details

1’-8” 20’-0” 20’-0” 1’-8”

45” Prestr.Bulb-T

Prestr.FasciaBeam

Cross Section

9’-5” 9’-5”9’-5” 9’-5”

TL-4 Wyoming Railing



Innovation for Efficiency

Arched Prestressed Fascia Beam

54”

45”

6





Prismatic

Section

(Large Adjustm

ents)Arched Secti

on

(Constant)

Arched Section

(Constant)





Arched Section

(Constant)

Prismatic

Section

(Shortened)

Arched Section

(Constant)





Arched Section

(Constant)

Arched Section

(Constant)

End Section(Small Adjustments)

Prismatic

Section

(Shortened)



Innovation for Long Life

Mar

sh Is

land

Chinco

teague I

sland

Cha

nnel

Site Plan

Intersection Framing








Arched Section

Prismatic

Section


7








Dapped End

Arched Section





Arched Section


Dapped End













8



Chincoteague Project

• Project Overview

• Bascule Span Highlights

• Met Aesthetic Requirements

• Satisfied Challenging Site Conditions

• Innovation for Efficiency

• Innovation for Long Life

chincoteague project overview presentation goals

Documents