Tower caisson for the Mackinac Bridge (9 of 45)

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 overburden. The material inside the ring is removed by crane and clam bucket. This removal relieves the pressure and the cutting edge continues to drive down until it reaches bedrock. When positioned the whole thing is filled with aggregate and grouted to make it one solid mass., Electronic reproduction of photograph. The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Abstract/Description: 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 overburden. The material inside the ring is removed by crane and clam bucket. This removal relieves the pressure and the cutting edge continues to drive down until it reaches bedrock. When positioned the whole thing is filled with aggregate and grouted to make it one solid mass.
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Date Created: 1954 (approximate)
Title: Tower caisson for the Mackinac Bridge (9 of 45).
Name(s): Superiorland Library Cooperative, contributor
Mackinac Bridge Authority, contributor
Type of Resource: still image
Date Created: 1954 (approximate)
Physical Form: photographs
Extent: 1 item
Abstract/Description: 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 overburden. The material inside the ring is removed by crane and clam bucket. This removal relieves the pressure and the cutting edge continues to drive down until it reaches bedrock. When positioned the whole thing is filled with aggregate and grouted to make it one solid mass.
Note(s):

Electronic reproduction of photograph. The Mackinac Bridge 1954 - 1958. Mackinac Bridge Authority
Subject(s): Bridges--Design and construction
St. Ignace (Mich.)
Mackinaw City (Mich.)
Mackinac Bridge (Mich.)
Held by: Superiorland Library Cooperative
Restrictions on Access: In copyright (http://rightsstatements.org/vocab/InC/1.0/)
Is Part Of: Mackinac Bridge Authority photographs. Identifier: SLC-011
In Collections: