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Upper Peninsula Regional Digitization Center

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  • All fields: caisson
(110 results)



Display: 20

    • Tower caisson move

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • One of the completed tower caisson cutting (1st) section sits at the Alpena fabrication site while machinery digs a channel out to Lake Huron so the caisson can be towed by tug to the straights, 990 miles away
    • Tower caisson move

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Dragline digs the channel that will be used to float the tower caisson (first section or cutting section) out onto Lake Huron. Note that the other tower caisson in in the right background.
    • Tower caisson move

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Getting the caisson No. 19 section out of the assembly area and into the lake went much better than it did for No. 20. No. 20's hole was filled in. No. 19 was jacked up, placed on skids and in four hours was in the place where No. 19 had been...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Cranes using clam buckets remove overburden from within the tower caisson. As material was removed, resistance was lowered at the cutting edge of the caisson which allowed it to cut its way to bedrock. It worked like a cookie cutter.
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This view, taken from a tower caisson shows them closing the gap in ring number 16 the pier No. 19 caisson. Through the gap, looking north, can be seen the other foundation projects (1)
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This view, taken from a tower caisson shows them closing the gap in ring number 16 the pier No. 19 caisson. Through the gap, looking north, can be seen the other foundation projects (2)
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • This completed first section of a tower caisson (No. 20) is ready to take the trip to the bridge 90 miles away. The unit was built on the beach. The crane had to dredge a channel so the caisson could be towed off the beach and into Lake Huron for...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • After the caisson was damaged by dynamiting the hardpan the channel had to be dammed up and pumps were used to keep the area dry so crews could repair the damage. This section is 44 feet tall and has a diameter of 116 feet. The buoyant caisson...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • After repairs were make, the channel was opened up so the caisson could be floated off the beach and into Lake Huron for the trip to the bridge site. Note the fabricated steel parts stacked and ready to begin building the next caisson
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Construction of the first section of a tower caisson. Note the wedge shaped cutting edge. These sections were fabricated in Gary, Indiana and shipped to Rockport (Alpena), MI by barge where they were assembled by Wiltse Brothers Shipyard. This...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Adding the next double walled steel ring. As rings were added the space between the two walls was filled with aggregate and the center was dredged. This action caused the caisson to cut its way through the overburden and eventually reach...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • The first section of a tower caisson (caisson No. 20) is fabricated at Alpena, MI and ready to be towed to the construction site. But first a channel must be dug to Lake Huron (background).
    • Tower caisson corral

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Two of the four corrals designed to hold the tower caisson in place during descent. The legs are made of 20 inch steel pipe with spuds inside them. The spuds were driven to bedrock in order to contain the caisson and guide it. These devices were...
    • Tower caisson

    • Mackinac Bridge (Mich) ; Bridges -- Design and construction
    • Photo shows the cutting edge of the tower caisson No. 19 during fabrication at Alpena, MI. Designed to work like a cookie cutter this caisson is filled with aggregate in the double wall area which acts as weight to drive it through the...

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