Prefabricated Bridge Delivery and Construction Bloomfield Township Bridge Replacements

Transcription

1 Prefabricated Bridge Delivery and Construction Bloomfield Township Bridge Replacements 11 March 2009 Tricon Engineering Group Guy Nelson, PE Bloomfield Township Wayne Domine, PE Director Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

2 Goals of Prefabrication Overall Goal for Prefabricated Construction Improve the Overall Condition of Michigan s Bridge Inventory Standardize Design and Plan Preparation Make Construction More Efficient Reduce Impacts to Motorists Improve Quality Provided by Current Methods Integrate Constructability During Design Innovation in Partnership with Contractor Improve Durability Improve Long Term Performance Reduce Maintenance Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

3 Proactive Design It All Starts in the Design Phase. M.O.T. Typically Dictates Alternatives Maintained traffic equals increased time Full closure decreases time but increase impact Project Scope should Consider Impacts of Construction Duration Fixes can be Typical: Part-Width Construction Widen Bridge to Maintain Traffic Use a Temporary Bridge Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

4 Proactive Design Actions that Help Speed Delivery and Construction: Let Projects Early for Contractor Innovation Allow Approved Alternatives Minimum Traffic Control Requirements 2 lanes open in each direction with min widths Minimum speed in construction zone Certain ramps must remain open Standardize Design Elements Substructure heights and lengths Superstructure Span and Depth Architectural features Subgrade Investigation Prior to Letting Remove/Relocate Utilities Prior to Letting Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

5 What are the Problems with Conventional Project Delivery and Construction? Project Delivery Limited Staff Plan Preparation and Design Too Time- Consuming and Labor Intensive Increased Cost Increasing Demand Construction Increased Cost to Maintain the Current Bridge Inventory Increased User Demand Increased User Delay Costs Environmental Restrictions Shorten Construction Season Public Perception Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

6 First Look for Cost and Time Saving Solutions, such as Rehabilitation of Existing Structure Beam End Repairs Painting Deck Overlay Re-Use Elements of Existing Structure Re-Use Exist Foundations (If Condition is Acceptable) Use Exist Abut for Scour Protection or Rip- Rap Full Closure of Roadway Reduces Construction Time and Cost Increases Work Zone Safety Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

7 First Look for Solutions with Conventional Construction, such as Incorporate Time Saving Elements Reduce Substructure Size by Lengthening Span Precast/Prefabricated Elements Publication No. FHWA NHI Hydraulic Engineering Circular No. 18 Wherever possible, use spill-through (sloping) abutments. Scour at spillthrough abutments is about 50 percent of that of vertical wall abutments. Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

8 Time Required for Conventional Construction (Standard Duration for Tasks) Construction Schedule Oakland Drive over I-94 Example 180 Long 2 Span, 90 wide Typical Duration 87 Days (4 Months) Cast-in-Place, Pile Supported Full Height Abutments Standard Concrete Beam Superstructure Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

9 Time Required for Prefabricated Construction (Standard Duration for Tasks) Prefabricated Superstructure Construction Schedule Oakland Drive over I-94 Example 180 Long 2 Span, 90 wide Duration 46 Days (2 Months) MSE Wall Abutments w/ Stub Abutment Prefabricated Superstructure Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

10 Specifying Precast Prefabricated Elements Performance Based Special Provision MDOT s MSE Wall Special Provision and Three-Sided Culvert Special Provision are Examples Prequalify Product and Suppliers Identify Design Criteria Provide Special Features such as Wall Texturing Bridge Railing Type Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

11 Specifying Precast Prefabricated Elements Plan Preparation Provide Geometry of Precast Element (Plan and Elevation View) Wall Envelope (Elevations and Lengths) Culvert Geometry (Span, Skew and Rise) Bridge Geometry (Span, Skew and Depth) Call Out Special Features such as Bridge Railing Attachment Foundations Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

12 Prefabricated Substructure Systems Precast Panel Retaining Wall Precast Piers Mechanically Stabilized Earth Wall Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

13 Prefabricated Abutments and Walls Mechanically Stabilized Earth Wall Abutments MSE Walls have Gained MDOT Acceptance Redundant Structure as the Bridge Foundation is Pile Supported Reduced Construction Material, Time and Cost Requires Less Piling Requires Very Little C.I.P. Concrete Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

14 Prefabricated Abutments and Walls Full Height Precast Panel Walls MDOT Project in Grand Region Grouted Vertical Joint Between Elements Wall Element Rebar Adhesively Anchored to Foundation Light Weight Fill can be Used to Lower Foundation Pressures and Wall Moments Reduced Construction Material, Time and Cost Requires Less Piling Requires Very Little C.I.P. Concrete Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

15 Prefabricated Superstructure Systems Con-Struct Prefabricated Superstructure System Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

16 Standard Joints TxDOT Welded Lateral Connector Steel Rod Welded to Embedded Plates then Epoxy Coated and Grouted Transverse Post Tensioning 150psi Minimum Compression (No Tension Joint) Cast-in-Place Tie Pour S.I.P. Metal Decking 7 Day Wet Cure Saw and Seal Construction Joints Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

17 Precast Bridge Barrier Texas Precast Barrier Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

18 Transporting and Erecting Precast Elements Issues to be Aware of.. Shipping Weights Element Size (Length & Width) Crane Requirements Location Access Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

19 Monroe County Road Commission Suder Road over Hooper Run Drain Old Bridge Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

20 Brainerd International Raceway Precast MSE Wall Abutments with Prefabricated Superstructure Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

21 Bloomfield Township Lochridge Road over Long Lake Canal Old Bridge Old Bridge Tricon Engineering Group, Con-Struct Prefabricated Bridge System Presentation Maech

22 Bloomfield Township Engineering & Environmental Services Paving and Canal Crossing Reconstruction Special Assessment District Wayne Domine, PE, Director

23 Bloomfield Township

24 Township Statistics Residential community square miles Population of 43,000

25 Project Location Residential subdivision, platted in 1955, with 34 property owners. All roadways, including two bridges, are dedicated as private for the use of the lot owners of the subdivision. The Subdivision is located in between two inland lakes and have two canals under the roadway.

26 Project Area: Aerial Photograph

27 Purpose for Project Re-pave the subdivision s private roads with asphalt. Replace two bridges at each canal crossings on the subdivision road.

28 Original Bridge

29 Township s Role Township has no obligation to improve private roads. Ordinances are in place to require private roads to be built to meet the County Road Commission s standards. Provide a means to finance private road improvements by the special assessment process.

30 Project Timeline September 2005 Township Board authorizes to create a SAD to assist the Homeowner s Association in repaving private roads and reconstructing the two existing bridges. Homeowner s original proposal was for $410,000 based on: -Wood bridge deck -Existing foundation -No engineering/permits

31 Project Timeline January 2006 Board authorized to proceed with Township SAD based on engineer s estimate of $844,000: -Concrete Box Culvert - Foundation Demolition - Underground utilities - Staged Construction - No Road Closure

32 Project Timeline Sept Construction Bids exceeded estimated project costs of the original petition. The following were key factors contributing to higher costs: - Providing Continuous Access - Limited Mobility for Crane - No Staging Area - Unknown Bridge Conditions - Relocating DTE Overhead

33 Limited Mobility

34 Limited Access

35 Project Timeline April 2007 Township Board authorizes additional engineering based on Homeowner s Association request to re-bid with an alternative bridge design.

36 Project Timeline June 2007 New construction bids received with alternative bridge option, the Con-Struct System, with lowest construction bid based on: - Precast Concrete Span - Pile foundation - Short-Term Road Closure

37 Maintained Access- Single Lane

38 Limited Disturbance

39 Limited Road Closures- 8 hours

40 Protected the waterway

41 Project Cost- Based on Bid Road Re-Paving Bid $ 208, Bridge Replacements Bid $ 740, Const. Contingencies (~10%) $ 95, Project Mgmt, Petition, Design, Layout, Permits, Legal, Adv., Financing, Etc $ 250, Utility Relocations ( Gas, DTE, ) $ 100, Total Project Costs $ 1,393, Cost per Unit of Benefit: $39,639.67

42 Project Summary The project began in October 2007 and was completed by May 2008 under budget. Homeowners were satisfied with the limited disturbance and the final look of the bridge.

43 Questions??? If you have any questions please contact me by at: Thank you, Wayne Domine, Director Bloomfield Township EESD