css national dialog presentation:: jumper creek bridge ... · pdf fileaccess constrained by a...
TRANSCRIPT
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CSS Case Study: Jumper Creek Bridge Replacement
By John S. Fowler, P.E.
CSS National Dialog 2
March 19, 2014
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Introduction
• FDOT inspects every bridge in the State biennially (includes bridges off the State Highway System)
• Sumter CR 311W over Jumper Creek
• 2009: Sufficiency Rating = 17.7 (out of 100)
• Considered structurally deficient
• Scheduled for replacement in FY 2012
• Federally funded bridge replacement
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The Existing Bridge
• Built in 1962
• One lane, timber structure
• 212’ long
• 11’ clear width from face of curb to face of curb
• 12’ total width from outside of curb to outside of curb
• No existing bridge railings
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The Site
• One way in; one way out
• Access constrained by a 14’ x 14’ box culvert
• CR 311W: 18’ wide dirt road north of the bridge; two rutted wheelpathssouth of the bridge (ADT ≈ 10 vpd)
• Six total property owners west of I-75; three south of Jumper Creek
• Rural area mostly used for agriculture
• Several billboards within CR 311W R/W
• Overhead utility lines at R/W line
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The Easy Answer
• Use FDOT Standards
• Two 12’ travel lanes
• 8’ paved shoulders
• Concrete and steel structure with approach slabs and barrier walls
• Maintain access during construction
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Design Options
• Replace bridge with box culvert
• Build access road from the south and eliminate the need for a bridge
• Permanent realignment of roadway at bridge
• Temporary bridge
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The Context
• Rural area, primarily agricultural use
• Very low volume dirt road with difficult access
• Three property owners affected by bridge closing, plus billboards and utilities
• Property owners:
• Do not want property opened to development
• Would prefer to maintain the rural character of the area
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The Solution
• New Bridge:
• One-lane typical section
• 14’ clear width (15’ from back of curb to back of curb)
• Steel piles and concrete pile caps
• Timber superstructure and bridge deck
• No approach slabs
• No bridge railings
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Other Practical Solutions
• Bridge completely closed during construction• Negotiated settlements with affected property owners totaling about $100,000
• Saved the cost of maintaining traffic
• Shortened the project schedule
• Access from I-75• Constructed temporary access from L/A right-of-way
• Allowed access to properties in case of emergency
• Allowed delivery of oversized equipment/materials to job site
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Temporary Access Detail
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Context Sensitive Solutions
• Use of timber: Maintained rural feel
• One-lane typical section: Appropriate for very low volume, and also pleased property owners who did not want the area opened to development
• No bridge railings: Appropriate for the local users who are comfortable traversing the bridge; also allowed for better views of the bridge
• No MOT: Saved time and money; property owners were happy to accept cash payment for being denied use of their property for three months
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Questions?Contact Info:John S. Fowler, P.E.Phone: (850) 330-1450E-mail: [email protected]