Fairfax Bridge Rehabilitation Program - Bridge Preventive Maintenance Program. January 29, 2014

Transcription

1 Fairfax Bridge Rehabilitation Program - Bridge Preventive Maintenance Program - Creek Road Bridge Presented by the Team of January 29, 2014

2 Bridge Design Process Project team explores both repair and replace options through assessments Options will be presented to Town Council with input from community Selected option is submitted to Caltrans to Caltrans Caltrans makes funding determination 2

3 Project Schedules BPMP Schedule Creek Road Bridge Schedule 3

4 Tonight s Agenda 6:40 Introduction/Background Valerie Taylor, Nelson\Nygaard Garrett Toy, Town Manager, Fairfax 6:50 Presentation: Bridge Preventive Maintenance Project (BPMP) Canyon Road Spruce Road Marin Road Nader Tamannaie, California Infrastructure Consultancy (CIC) 7:20 Q & A All 7:35 Presentation: Creek Road Bridge Rehabilitation Project 8:00 Q & A All 8:15 Group exercise, Creek Road Bridge: Preferences & Concerns Nader Tamannaie, (CIC) All 4 8:30 Summary and Next Steps Garrett Toy

5 Bridge Preventive Maintenance

6 Bridge Preventive Maintenance program (BPMP) Bridges inspected every 2 years Federal Highway Bridge Program (HBP) Under stewardship of Caltrans Program fixes preventive maintenance issues, not routine maintenance NEPA/CEQA environmental studies & agency permits required when working in the creek 88.53% funded by HBP, the rest by Fairfax 6

7 Why Is BPMP Needed? The bridges are 85 years old or older Original concrete and construction workmanship not the best Bridges not well maintained over the years BPMP improves safety and will prolong the bridge life and at lost cost to Fairfax 7

8 8 Fairfax Bridges in BPMP

9 9 Bridge Terminology - Topside

10 10 Bridge Terminology Below Deck

11 11 Canyon Road Bridge

12 12 Canyon Road Bridge Maintenance Needs: Absent wingwall

13 13 Canyon Road Partial Wingwall

14 14 Canyon Road Approach Guard Rails

15 15 Canyon Road Repairs Concept Plan

16 Construction Period Canyon Road Bridge: 3 weeks 16

17 17 Spruce Road Bridge

18 18 Spruce Road Bridge Maintenance needs: Cracked Deck Slab

19 Spruce Road Repairs Concept Plan Spruce Road Repairs Concept Plan 19

20 Construction Period Spruce Road Bridge: 2 weeks 20

21 21 Marin Road Bridge

22 22 Marin Road Bridge Maintenance Needs Toppled wingwall

23 Marin Road Bridge Cracked wingwall & Spalls Headwall 23

24 24 Marin Road Repairs Concept Plan

25 Construction Period Marin Road Bridge: 2 weeks 25

26 BPMP Summary PREVENTIVE MAINTENANCE ITEMS FOR FAIRFAX BRIDGES Bridge Treat Bridge Deck Repair Cracks & Spalls Repair Existing Wing-wall Remove Unused Utility pipes Install Narrow Bridge Signs Optional Actions Install Bridge Approach Rail Replace Bridge in Next Years Canyon Metha- Road crylate Yes Two No Two Two No Spruce Road Polyester Concrete Yes None Yes None One Yes Marin Road No Yes Two No None None Maybe 26

27 Environmental Permits Needed AGENCY PERMIT NEEDED US Army Corps of Engineers (USACOE) Clean Water Act, Section 404 Permit (most likely a Nationwide Permit) Regional Water Quality Control Board (RWQCB) Clean Water Act, Section 401 Certification or Waiver CA Department of Fish & Game (DF&G) Lake and Streambed Alteration Agreement 27

28 Construction Period Recap Canyon Road Bridge: 3 weeks Spruce Road Bridge: 2 weeks Marin Road Bridge: 2 weeks Work may be concurrent or back to back 28

29 Bridge Closure Requirements BRIDGE TEMPORARY BRIDGE CLOSURE REQUIREMENTS Canyon Road Close bridge for 4-5 hours after 12 p.m. Allow emergency vehicles to cross the bridge Publicize the dates and hours well ahead of the closure Spruce Road Marin Road Close bridge for 3 days to place polyester concrete Detour the traffic and post the project area for the detour Publicize i the dates and hours well ahead of the closure No bridge closure will be necessary. 29

30 Next Steps Perform Field Review with Caltrans environmental staff on February 4 th Submit the BPMP Assessment Report Request authorization for design, including environmental studies Obtain agency permits Finish finaldesign, hold another workshop, prepare bid package, advertise for construction Request authorization for construction 30

31 Questions & Answers

32 Creek C kr Road d Bridge B id Seismic Retrofit

33 More Bridge Terminology Girder Bent Substructure Abutment Column 33 Footing (under column & below ground)

34 34 Bridge Terminology, Continued

35 Project Area Project Site 35

36 36 Bridge Plan View & Adjacent Parcel Lines

37 Attributes of the Existing Bridge Built in 1929 Four span Concrete T Beam 10 foot tlanes, no shoulders, narrow sidewalks Articulated superstructure on concrete bents Shallow foundations N. abutment experienced washout in 2005 Marin County a seismically Active region Bridge not a lifeline structure 37

38 Bridge Assessment & Goals Known to be seismically vulnerable since 1990s No record plans available Test engineers took cores from concrete, used GPR to locate rebar in concrete, mapped spalls Geotechnical engineer drilled borings to investigate the foundation soils CIC performed new analysis according to current criteria i Goal is to learn from each other what is best to do about the bridge 38

39 How is the Bridge Seismically Vulnerable and Subject to Collapse? Bridge will experience ground accelerations up to 1.35 g Superstructure will unseat due to seismic movement Columns will fail too much bending Bent caps will fail too much bending Foundations will fail too much rotation Bridge considered as Category 1 Bridge, subject to collapse 39

40 Seismic Retrofit and Alternate Solutions Three alternative concepts plus the cost of retrofitting the bridge Infill walls, enlarged footings, g, restrainer cables, shear keys and seismic approach slabs Infill walls, waffle slabs, restrainer cables and shear keys Infill walls, large diameter cast in drilled hole (CIDH) piles, restrainer cables and shear keys Address preventive maintenance needs too 40

41 41 Concept Plan For Retrofit Alternate 1

42 Consider Bridge Widening for Retrofit Accomplish seismic retrofit by building an anchor structure along the north edge Complement retrofit with infill walls and large CIDH piles at abutments Gain standard vehicular lanes, bike lanes and standard dsidewalks, more multimodal li l Width increased from 28 feet to 44 feet Implement traffic calming measures Address preventive maintenance needs 42

43 Retrofit through Widening Concept Plan 43

44 Consider Bridge Replacement as a Way to Address seismic Deficiencies Remove existing bridge and replace it New bridge 44 feet wide (Increased from 28 2 ) Same lanes and other geometry as widening Two span box girder bridge on 2 column bent Opportunity for multi modal accommodation Opportunity for traffic calming measures 44

45 Bridge Replacement 45

46 Construction Period Alternate 1 (Retrofit): 6 months (one season) Alternate 2 (Widen): 10 months (2 seasons) Alternate 3 (Replace): 12 months (2 seasons) 46

47 Traffic Handling During Construction Choice 1: Keep the existing bridge open during retrofit, or widening For replacement, remove and replace in two stages Choice 2: Close the road for any of the 3 alternates and detour the traffic 47

48 48 Construction Logistics - Detour

49 Alternate Comparisons - Advantages COSTS ALTERNATIVE (CONSTRUCTION + Lifecycle & Capital) ADVANTAGES 1C (Retrofit only) 2 (Retrofit with Widening) 3 (Replace Bridge) 49 Construction: $1.21 m Lifecycle: 1.97 m Total: $3.18 m Construction: 2.58 m Lifecycle: 1.63 m Total:$4.21 m Construction: 3.05 m Lifecycle: 0.74 m Total:$3.79 million Least amount of creek disturbance Short one-season project No falsework required Least expensive alternate Standard bike lanes and sidewalks A full one-season project No falsework required Multimodal + Conducive to Traffic Calming Standard bike lanes and sidewalks years of life Low maintenance Aesthetically pleasing Lowest lifecycle cost Multimodal + Conducive to Traffic Calming

50 Alternate Comparisons - Disadvantages ALTERNATIVE 1C (Retrofit only) 2 (Retrofit with Widening) 3 (Replace Bridge) 50 DISADVANTAGES Limited bridge life, years & regular maintenance needed Bridge and sidewalks remain narrow Aesthetically neutral Large CIDH pile installation messy for a couple of weeks Lifecycle and future capital costs (nearly $2 m) paid by Fairfax Existing bridge portion will have limited life (30 40 year), need moderate maintenance, & will need to be replaced in the future Most expensive alternate Lifecycle and future capital costs (nearly $1.6 m) paid by Fairfax Bridge foundation work in creek May require fl falsework kin creek Total cost 20% more than retrofit, but 11% less than widening Likely two season construction

51 Retrofit vs. Replacement Decision Upfront as well as lifecycle costs (the latter on Fairfax) Remaining life of existing bridge vs. new bridge Amenities such as bike lanes and ADA compliant sidewalks Bridge aesthetics CIC recommends replacement 51

52 Next Steps Decide which alternate to go forward with tonight Town Council to consider the decision on the February 5 th Council meeting Perform Field Review with Caltrans on Feb. 11 th Submit Seismic Retrofit Strategy Report to Caltrans Caltrans to approve Seismic Retrofit Strategy Report, its recommendations and costs 52

53 Process Approval and Bridge Funding NEPA/CEQA environmental studies and agency permits required Apply to Caltrans for design & environmental funds Design & environmental 100% federally funded Construction 88.5% federal, 11.5% State, 0% Fairfax Same cost sharing will apply to replacement Use it or lose it funding 53

54 Questions & Answers

55 Thank you for coming! For more information website: b it htt //f i f b id phone: (Daniele or Valerie)