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Upper Peninsula Regional Digitization Center

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(32 results)



Display: 20

    • Cable bent pier

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Pier 21, the north cable-bent piers, consists of a pair of circular foundations 50 feet in diameter founded on bedrock, 65 feet below the surface. Each concrete cylinder was topped with a pedestal 16 feet in diameter. The sheet piling used for...
    • Tower base

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Workers screed and level the grout that will become the surface on which the tower base plate will sit. It must be flat and level to support and transfer the 6,500 ton of tower to the pedestal. The bolts support a ""roof"" to keep weather off the...
    • Tower base

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Workers screed and level the grout that will become the surface on which the tower base plate will sit. It must be flat and level to support and transfer the 6,500 ton of tower to the pedestal. The bolts support a ""roof"" to keep weather off the...
    • Tower base

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Workers screed and level the grout that will become the surface on which the tower base plate will sit. It must be flat and level to support and transfer the 6,500 ton of tower to the pedestal. The bolts support a ""roof"" to keep weather off the...
    • Tower going up

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • In this photo can be seen the foundation cylinder that is sitting on bedrock some 200 feet below the water surface. At eight feet below the surface (-8) the pedestals raise to ten feet above the water (+10). Upon the pedestals the steel tower...
    • Soo bridge

    • Railroads ; Duluth, South Shore, and Atlantic Railway Company

    • Source: The Mining Journal
      Marquette, Mi.
      April 30, 1887
      Saturday

      The "Soo" Bridge
      The "Soo" bridge is being built by four railroads in conjunction with the GT, CPR, DSS&A and the MSSM&A. The contracts...
    • Anchor Pier

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Installing the air lift which was used to get overlay out of the caissons along with water jetting to loosen material and the crane with a clam bucket to lift material to the surface.
    • Expansion Joint

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Looking north over the driving surface of the south approach the one of the many ""finger"" type expansion joints is visible. Also visible in the center right is one of the State of Michigan car ferries, with it's days of service at the straits...
    • Anchor pier

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This photo shows the aggregate is above the surface of the surrounding water and the two inch reinforcing bar (rebar) is above the aggregate ready for the next course after grouting is completed below. The future superstructure will be added here...
    • Pier no. 18 tilts

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Pier No. 18, the south cable bent pier, started to tilt. This was discovered from the constant inspections and surveying. Piles were driven to bedrock on the low side to stop the movement and digging and loading on the high side was done to right...
    • Grouting

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Here the grout plant is moored to one of the cable anchor piers. The grout is pumped through the grout tubes into the voids between the limestone aggregate and raises to the surface forcing the water up and out. (1)
    • Grouting

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Here the grout plant is moored to one of the cable anchor piers. The grout is pumped through the grout tubes into the voids between the limestone aggregate and raises to the surface forcing the water up and out. (2)
    • Aggregate placement

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Limestone, (Dolomite) from quarries at Drumand Island, MI. about 50 miles to the Northeast, was shipped in self-unloading lake freighters to the site. These vessels carried 12,000 tons per load. Vertical pipes (grout pipes) were installed from...

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