PA TURNPIKE A57.66 SLIDE – IN BRIDGE REPLACEMENTS Phil Carper – Road-Con Inc APC / PENNDOT FALL SEMINAR NOVEMBER 16, 2017 Quentin D Rissler, PE – Larson Design Group
PA TURNPIKE A57.66 SLIDE – IN BRIDGE
REPLACEMENTS
Phil Carper – Road-Con Inc
APC / PENNDOT FALL SEMINAR NOVEMBER 16, 2017
Quentin D Rissler, PE – Larson Design Group
PROJECT PARTNERS
• Pennsylvania Turnpike Commission -Owner
• Road-Con Inc. – Construction Contractor
• Larson Design Group – Contractor’s Engineer
• HDR Inc. – Design Engineer
• STV Inc. – Construction Management and Inspection
PROJECT NEEDS AND DESCRIPTION – EXISTING STRUCTURE
3 Span Steel Plate Girder Bridge-Overall Rating of 5 - Deck and Pier Issues
CHALLENGES• Two Narrow Bridges
• 30,000 ADT
• Location
Bridge NB-355 – PTC Northeast Extension over Crackersport Road, Lehigh County, PA
ACCELERATED BRIDGE CONSTRUCTION• 12 months
• 55 hours
• $55,000 / hour
Bridge NB-355 – PTC Northeast Extension over Crackersport Road, Lehigh County, PA
NEW STRUCTURE• Single Span Steel Plate Girder • Replace substructure with stub
abutments on micropiles
ADD A SLIDE TITLE - 4
WEEKEND CLOSURE (10/13 – 10/16)
• Duration: 9:30pm Friday evening to 2:00am Monday morning
• No serious traffic problems. Traffic counts are being reviewed.
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RISING TO THE CHALLENGE…….
• Brainstorming• Many discarded ideas• Contractor – Engineer Teamwork• Owner Flexibility • Goal – Plan for Contingencies
- Efficiency on 55 hour closure- Simplify the Process
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THE SOLUTION…….
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TEMPORARY SUPPORT STRUCTURES | Piles
TEMPORARY SUPPORT STRUCTURES | Lateral Forces
TEMPORARY SUPPORT STRUCTURES | Lateral Forces
TEMPORARY SUPPORT STRUCTURES | Jacking Contingencies
• Soil Nail Wall
• 30’ Average Nail Depth
• 4’ Spacing
• Excavation Height = 9’6”
• Concrete Whaler System
TEMPORARY EXCAVATION & SUPPORT
TEMPORARY EXCAVATION & SUPPORT
• 9.625” Diameter
• Depth = 85’
• 10’ Into Rock
• 16’ Overhead Clearance
• Installed in 5’ lengths
MICRO-PILES
MICRO-PILES
• 77’ 6” length
• 9’ 6” height
• Class A Sulfate Resistant Concrete
• Jacking Ledge
ABUTMENTS
• Abutments & Wings Backfilled with Class A Concrete
• Prevent Approach Settlement
ABUTMENTS
• Anchor Bolts Cored and Placed Prior to Slide
ABUTMENTS
• Tight Quarters
• 5 Girder/Bridge
• Length = 117 LF
• 9/16 in. X 63 in. Web
• Weight = 30,000 EA
• 75 Ton Hydraulic Crawler
CONSTRUCTING THE SUPERSTRUCTURE
• Slide Beam Elevation = New Abutment Elevation
• Constructed on Bearing Pads
CONSTRUCTING THE SUPERSTRUCTURE
• End Diaphragms
• Pull Rod Conduit
CONSTRUCTING THE SUPERSTRUCTURE
• End Diaphragms
• Anchor Block Block-out
CONSTRUCTING THE SUPERSTRUCTURE
• 170 CY AAAP Concrete Per Deck
CONSTRUCTING THE SUPERSTRUCTURE
LATERAL BRIDGE SLIDE - OVERVIEW
SLIDING CONSIDERATIONS
• Rollers vs. Teflon Pads?• Rollers = Guided and Less Friction
• Push vs. Pull – Lateral Forces?• Push/Pull System Used With Rod and Hollow
Core Jacks• Conduit/Pull Rod Placement?• How do we travel in reverse?• Modifications to As-Designed Plans
LATERAL BRIDGE SLIDE
• Center-point Anchor block on Abutments
MODIFICATIONS TO AS-DESIGNED PLANS
• Conduit Through End Diaphragm for Pull Rod
MODIFICATIONS TO AS-DESIGNED PLANS
• Falsework to Abutment Connection
PREPARING FOR THE SLIDE
TEST SLIDE
• Jacking
• Channel Placement
• Roller Placement
• Forward – Min. 6”, per Contract Specifications
TEST SLIDE
• Reverse Slide System
• 20 Minutes to Switch the Sliding Components
TEST SLIDE
THE BIG WEEKEND
THE BIG WEEKEND
• 55 Hour Closure of the PA Turnpike – Exit 74 to 56• 60 Mile Detour Implementation• 2 Bridges to Demolish• 2 Bridges to Slide/Jack/Set Down • 400 Ton of Stone To Place• Median Barrier and Transitions• 1600 sy of Milling• 500 Tons of Asphalt• $55,000 per hour after 55 hours
DEMOLITION
• Saw-cutting vs. Hammers
• Non-composite deck
• 4 Excavators
• 9 Hours
DEMOLITION
• Anchor Block on New Abutment; Modified Diaphragms
• 100 Ton Hollow Core Jack
• 100 Ton Hilman Rollers
• 1 ¼” Threaded Rod
• 1.1 Million Pounds per Bridge
• Sliding Load on Rollers = 15 Ton/Hollow Core Jack
• Slide Distance = 42’
• Max Speed = 11 in. Every 3 Minutes (0.003 mph; 0.30 ft/min)
LATERAL BRIDGE SLIDE
BIG SIGH OF RELIEF – SLIDE COMPLETED
COMPLETED STRUCTURES
Questions?
THANK YOU