WisDOT - Bureau of Structures Matthew Coupar. Anything “structural” – change in loading,...
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Transcript of WisDOT - Bureau of Structures Matthew Coupar. Anything “structural” – change in loading,...
2011 Southwest Region Construction Conference
2015 Southwest Region Construction ConferenceWisDOT - Bureau of Structures
Matthew Coupar
Introduction1Contact BOS When & Why?Anything structural change in loading, structural capacity, pile locations
If in doubt, call us! See Structures Contacts Handout BOS Contacts.doc
Remind Contractor to go thru Construction Staff for answers
2Sign/Signal StructuresOverhead sign supports, sign bridges, traffic signal monotubes, high mast light poles
New specifications are in affect this construction season
Contractors should contact project personnel prior to installing these structuresIt is WisDOTs responsibility to provide Quality Assurance (not Quality Control) for installationField engineers should receive DT 2322 and DT 2321 forms from the contractor and provide them to the in-service inspectors for inclusion in initial inspection report (uploaded into HSIS)
Bolt suppliers paperwork should include rotational capacity test information (high-strength bolt connections)
Contractors shall perform preinstallation test and install high-strength bolts/DTIs and anchor bolts per Form DT 2322 and DT 2321 respectively3Sign/Signal Structures ContdField engineers should schedule an in service initial inspection prior to opening to traffic with the Region bridge maintenance ancillary inspector
Common construction issuesFoundations Poor soils, groundwater, etc.Shafts should be augured not excavated, backfilling is not acceptable, sonotube forms shall not be usedSteel casings shall be installed in difficult locations and pulled as the concrete is being tremiedWith the approval of BOS, corrugated steel casings may be screwed in and left in place at the expense of the contractorNew installation procedures
New install procedures= high strength bolt requirements, bolt tensioning using DTIsAllow structure install after concrete attains 3500 psi or 7 equivalent days4Sign/Signal Structures ContdContacts:Traffic Signal Structures and FoundationsAlex Crabtree (BOS) 608.266.3686Sign StructuresVu Thao (BOS) 608.267.2869New Installation ProceduresDave Genson (BOS) 608.266.3722Mike Wood (BOS) 608.358.86545CMM Updates(Structures Related)CMM 1-65Updated engineer responsibilities related to as-built structure plans (require STRUCTURE to be placed above as-built title box on title sheet)
CMM 5-70Guidance and checklist for field personnel inspecting ancillary structures installations (mainly pertain to new sign/signal structures installation requirements)6Hot Weather ConcretingStd. Spec. 501.3.8.2 (FDM and CMM Guidance will be available in March 2015)
New PoliciesDual Approach to Ice Based on Project TypeProjects with HPC or greater than 2000 CY concrete STSP 501.1000.S shall be included in plans and bid by contractorsProjects with less than 2000 CY concrete Standard spec administrative item payment of $0.75/lb remains in affect
Ice should be paid for field engineers should not delay pours if ice is required
Ice delivered and stored on site should not be paid for unless used as required per Std. Spec.
7Standard Spec. UpdateMasonry Anchor Install 502.3.14.1Type L or S adhesive anchorACI/CRSI Certified Installer, orField Verification by Non-Destructive Pullout Testing
8STSP ChangesPigmented Protective Surface TreatmentUsed on parapets, different product than decks
Stainless Steel ReinforcementMoved into STSPs
Polymer Modified Asphalt (for Overlays)Moved into STSPs
9Removal Issues
Contractor should use right equipment and size for the job10
Good size of top flange gone from girder, looks piece is laying in river belowAvoid sawcutting over girder if possible11
12Joint Replacement
-We have had problems with contractors doing minimal removal for joint replacement-Provide 4 joint removal, emphasize importance of contractor to follow plans.13Erosion/Grading @ WingsPlan details for fill at wing tipsProper Fill = Minimize Future Erosion
The contractor should provide fill up to red line which is in line with plans.Stream Crossings-Installation issues-Mention riprap around abutments should be provided as shown on plans (thickness/location) cases where contractor just dumps it on top of ground and should toe in if called for. -verify that it meet the specification for size, if too small will wash away-make sure geotextile fabric is applied-All very important so abutments are protected from erosion14Pile Encased PierNo cofferdam required only forms
Tremie concrete well.15
Pile Encased Pier
Precast PiersBe plugged into fabrication of elementsTemplates to match at connectionsVerify dimensions for field installationGet BOS & Jim Parry involvedSuggest mock grout pour before the actualFollow grouted coupler instructions17
18Deck Rebar and Bar ChairsIssues with loose deck steel Bar chair spacing too largeBar tie spacing too large or missingSTD. Spec. 505.3.4 Placing and Fastening
Was raised by Joe Balice of FHWA19Deck Pour ChecksProbing during deck pour and dry runTop CoverBottom CoverDeck thickness
20Bridge ApproachesStructural Approach SlabsUS Highways & InterstatesDetails included in the structure planContractors have successfully poured with bridge deck
Reviewed last year
Now this is a standard for IHs and USHs
Explain parts of the Approach Slab point outFootingSlabZ-Bar attachment to superstructureConventional approach slab to be used based on FDM guidance
Pay attention to plan details - especially at the corners of the bridges and on bridges with skews
Point out location of special joint if contractor elects to pour with the deck.21Bridge Approaches ContinuedDetail for pouring SAS with bridge deckContractor would have to propose using this
Make it clear that this is an option if the contractor proposes to use it
Saves time because there is only 1 pour instead of 3 separate pours that all have there own cure times.
Point out parts and pieces of the joint/detail
Contact BOS if the contractor proposes to use this to get approval for the detail22
23Alternate Construction Joint
AbutmentPier CapDo not allow a sawcut in lieu of zinc/plastic strip24Alternate Construction Joint
Saw cutDO NOT ALLOWDo not allow a sawcut in lieu of zinc/plastic strip25Sawcut on Bridge Deck
Abutment Paving Block Joint
Sawcut on Bridge Deck
26Welding 101Welders must be qualified prior to welding in the position, process, and type of joint. Correct Certification.A written weld procedure for each type of weld is required.Get familiar with weld symbols and nomenclature.Storage and care of welding electrodes.A certification from Department of Public Safety & Professional Services is not applicable to transportation structures.27ConclusionCall us with QuestionsWe look forward to another great year of bridge construction! THANK YOU!
28Any Questions?
29