BRIDGE MAINTENACE EMERGENCY PROJECTS

Transcription

1 BRIDGE MAINTENACE EMERGENCY PROJECTS

2 PILE DRIVING ANALYZER (PDA) Bridge Maintenance works with the Geotechnical section to determine pile capacity Bridge Maintenance collects the PDA restrike data required for analysis Geotechnical section performs a CAPWAP analysis to determine pile capacity The results usually prevent piles from needing to be spliced which saves on construction costs

3 LEVEE REPAIR The North Lafourche Levee District asked for assistance in repairing a levee that had a sand boil Statewide Bridge Crew repaired the levee by driving sheet pile to block the sand boil It s been determined that a vibratory hammer is a MUST in order to drive sheet pile In the past, sheet pile has been driven using an air impact hammer which would take approximately 30 minutes to an hour to drive just ONE sheet pile The vibratory hammer will drive a sheet pile in a approximately 30 seconds Use of a vibratory hammer saves on construction time

4 DRIVING SHEET PILE

5 US 90 OVER BAYOU RAMOS Type III girders developed shear cracks Two theories were suspected as causes: 1. Bad rigidity of the continuity diaphragms 2. Bad concrete was used to construct the girders

6 SHEAR CRACKS

7 Drilling the Core Samples First Step: Locating a drill that can obtain the size sample needed for testing. Second Step: Designing and building an apparatus that will enable a drill used vertically to drill horizontally Third Step: Locating rebar in the girders and bridge deck. Accomplished by referencing As- Builts and Non-Destructive Testing using a Multi-Scanner. Fourth Step: Hooking the drill onto the girder Fifth Step: Drill Baby Drill Results: A Beautiful 7 inch Core Sample End Note: Testing of Core Samples showed the that the concrete was good.

8 TOOLS

9 PREPPING

10 STILL PREPPING

11 DRILL BABY DRILL

12 EMERGENCY REPAIRS FENDER REPAIRS Marine Collision with the vertical lift bridge in Perry, LA damaged the fender system Statewide Bridge Crew removed the damaged portion and replaced it with new timber piles and new timber whalers Obstacles: Marine Traffic

13 NO GOOD

14 BRAND SPANKING NEW

15 EMERGENCY REPAIRS FENDER REPAIRS Marine collision with the movable swing span bridge in Adeline, LA damaged the fender system Statewide Water Crew repaired the fender system. Routine repairs for this crew.

16 EMERGENCY REPAIRS Portal Repairs O.K. Allen Bridge in Alexandria was hit, damaging a portal. Jay Carnell, P.E., that s C as in Charlie, A as in Alpha designed a new one. Once it was fabricated Statewide Bridge Crew installed the new portal. Piece of Cake!

17 REMOVING DAMAGED PORTAL

18 INSTALLATION

19 SOUTH PORTAL

20 EMERGENCY REPAIRS Portal Repairs Vertical lift span bridge in Perry, LA was hit, damaging a portal. Jay Carnell, P.E., designed a replacement. This guy is an engineering deity. Statewide Bridge Crew installed the portal, easy as pie. They re pros at this, those portals get hit all the time.

21 NORTH PORTAL

22 SOUTH PORTAL

23 EMERGENCY REPAIRS RETAINING WALL The embankment under the swing bridge in Charenton, LA was washing away The statewide bridge crew constructed a retaining wall using steel H piles and timber planks The wing walls were constructed by driving sheet pile

24 RETAINING WALL INSTALLATION

25 ADDED BACKFILL

26 EMERGENCY REPAIRS Palmetto, LA 10 Bridge needed to be strengthened to raise the load posting 9 steel helper bents were installed in each span at mid-span Obstacles: 7 of the 9 bents were over water, work barge had to be used to float the caps under the bridge Percent of the job required welding: Caps welded to the piles, cross-bracing welded to the piles, web stiffeners welded to the cap under each girder

27 PILE INSTALLATION Template in place for piles Driven Piles and Cross-bracing

28 CAP INSTALLATION Floating The Caps Completed Bent

29 WELDING Cross bracing, web stiffeners, and numerous plates were welded at each bent

30 EMERGENCY REPAIRS LaRose, LA Pontoon Apron Replacement Statewide Bridge Crew fabricated a new apron and installed it 3 day operation

31 AFTER INSTALLATION

32 EMERGENCY REPAIRS Hopedale BP Oil Spill Relief Station was located in Hopedale, LA. The bridge located on LA 624 was load posted and not able to handle the equipment loads that were crossing. The deck was in poor condition, but closure was not an option. Statewide Bridge Crew fabricated a temporary 7 span timber deck in a weekend. The new deck was hauled, a few spans at a time from Port Allen, LA to Hopedale, LA. The crew had a 12 hour (6 p.m. to 6 a.m.) window to install the deck. The job was a success! Fisherman and Oil Relief workers were delighted.

33 FABRICATION

34 LOADING AND HAULING

35 INSTALLATION

36 COMPLETED

37 HELPING OUT LTRC The statewide bridge crew was asked to fabricate a testing reaction frame for LTRC The frame was designed by the one and only Jay Carnell, P.E. The frame is used for load testing

38 AFTER INSTALLATION

39 BRIDGE REPLACEMENTS US 61 Bridge Replacement Originally a Single Span bridge which had an abutment failure The approach slab and the bridge deck were jammed against each other and the bridge rail was the only element holding the bridge in place Statewide Bridge Crew to the Rescue Installed a 5 span bridge in 16 days

40 ABUTMENT FAILURE

41 DEMOLITION

42 BENTS 1 & 2

43 WING WALL INSTALLATION

44 INSTALLING SPAN 1

45 SPANS 2 THRU 5

46 SPANS 2 THRU 5

47 ASPHALT AND STRIPING

48 VOILA!