Presentation on theme: "St. Croix River Crossing S. P"— Presentation transcript:
1 St. Croix River Crossing S. P St. Croix River Crossing S.P Contractor Informational Meeting May 15, 20135/15/2013Contact: Paul Kivisto, P.E.St. Croix Crossing Bridge Construction Engineer
2 The contract will be the governing document and anything we say here is to help contractors understand the draft plans and clarify items that may be in the contract. If there is a conflict between what is presented and the final plans and specifications the plans and specifications will prevail.
4 Bridge 82045 – River Spans Extradosed with 5 towers 3360 feet in lengthPrecast segments 18’ deepTwin three cell boxes with longitudinal closurePiers constructed to 15’ above normal pool as part of early foundation contract
5 Br. 82045 Major Components Concrete box segments Five towers Approximately 600 segments (twin segments)Max weight about 150 to 180 tonsFive towersVariable height to 230 feet above waterTowers 67’ above deckWisconsin slope pier – 100 ft tallDrilled Shafts, Footings, Pier Starters already constructed
7 Main Span Cross Section Varies 102’-5” to 98’-6” out to out100’ +/-’ +/-Closure PourClosure Pour18’-0”18’
8 82045 – Approach Spans Precast concrete box superstructure Alignment separated1600 feet in lengthVary in depth from 18 to 10 feetGore area is complex, cast-in-place on falseworkH-pile foundations
9 Ramps 82047 and 82048 Concrete box superstructure On ramp will be cast in place on falseworkOff ramp designed as precast segmentalVary in depth from 14 to 10 feetH-pile foundations
10 Environmental Constraints 5/15/2013Environmental ConstraintsWetlands on Minnesota ApproachForested Wetlands near Minnesota bankSt. Croix RiverWisconsin BluffCommitments made to minimize impacts and to preserve water qualityRemove Xcel Barge Unloader Facility
14 Wisconsin Bluff Last pier is similar to MN side Smaller footingPrecast segments, 18 ft deep275 ft box girder end spanMinimize impact to bluff, especially near river24” CIP steel shell pilesAccess from abutment
17 Reference Information Documents (RID) ftp://ftp2.dot.state.mn.us/pub/outbound/StCroixGeotech Information, Construction Options, Wisconsin Bluff, Cross BeamOther information including permits are on other folders in same directoryInformation provided will not be contractual
18 (1301) BEST VALUE METHOD (Pre-qualification) Technical Proposals will be due approximately 4 weeks after advertisementSome of the following may be pre-qualifiedExperience of Personnel (1 or more)Project ManagerEnvironmental Compliance OfficerStructures Superintendent (Precast Segmental)Casting Yard Engineer/SuperintendentSuperstructure Construction EngineerQuality Control Manager
19 (1511) Inspection of Work Implementing Critical Activity Hold Points Environmental ReviewsCasting segments: geometry, rebar, ductsCross beam construction: geometry, rebar, ductsTower construction: anchor box placementCast-in-place boxes: geometry, rebar, ducts
20 (1701) Environmental Program Delivery Environmental TrainingRequired for all personnel on siteContractor shall have an Environmental Compliance OfficerEnsure all permits are adhered to
21 (1803) CPM ScheduleContractor will access and update MnDOT Enterprise Project Management System (EPMS) P6 softwareSchedule to be cost and resource loadedWill need to tie to 4D Synchro modelContractor must maintain links for all activities
22 (1803) Prosecution of WorkHaul roads not permitted in environmentally sensitive areasAccess sites include the Xcel Energy ramp and underneath the bridge. No agreements or permits have been obtained for other areas.MnDOT may consider keeping Stillwater Barge Facility Access, but no agreement with City.No permits have been obtained for Wisconsin shore accessTrestle under bridge part of COE permit
23 Trestle from Minnesota shore Allowed as contractor option to minimize wetland impacts
24 (1806) Contract Time All work completed by November, 2016. Piers 8, 9, and 12 early foundations will be ready by Dec 20, 2013.Piers 10 and 11 early foundations will be ready by April 30, 2014.
25 Mass ConcreteWill be included on pier blades, crossbeams, some pier segments, towers, pier columns,Will include maximum temperature and temperature differential
26 Concrete Properties Contractor mix design Require testing as detailed in specs4,000 psi concrete strength in approach substructures.6,000 psi to 9,000 psi in segments9,000 psi is at 180 days8,000 psi in crossbeams7,000 – 8,000 psi in pier blades and towers
28 Payment Items Cable Stay System __LS Precast Segmental Construction __LSSegmental Erection Equipment (Extrados) __LSCable Vibration Testing __LS
29 QuestionsQuestions or comments related to the project can be directed to Paul Kivisto and will be considered in final development of the plans and specifications.
30 Thanks for your interest! 5/15/2013Thanks for your interest!Paul Kivisto, P.E.St. Croix Crossing Bridge Construction Engineer(651) office(651) cellftp site: ftp://ftp2.dot.state.mn.us/pub/outbound/StCroixProject web site: