![]() American Bridge had used their eye bars on the Three Sisters Bridges across the Allegheny River in Pittsburgh between 19, using an alternating nest of nine and eight eyebars. The same thing happened at Point Pleasant, where the American Bridge Company convinced Greiner and the Bridge Company that a similar design was safe and less expensive than a conventional wire cable suspension bridge. There were four 2- x 12-inch bars per chain, and the main span was 1,113 feet 9 inches long. They also adopted Lindenthal’s pinned tower rocker bearings at the foot of the two-dimensional towers. The original and final design of Florianopolis Bridge. However, with pressure from the American Bridge Company (which had developed a new high strength eyebar) and the bridge owners, they changed their design to a chain. Originally, they designed a standard wire cable suspension bridge. Steinman were selected as design engineers for a bridge at Florianopolis (Brazil) to link the mainland with the island of Santa Catarina. In 1903, a Panel of Engineers selected to evaluate chains for the Manhattan Bridge determined, “the chains have a decided advantage in the accessibility of all parts for inspection and protection, as well as in economy and rapidity of erection and they are to be preferred to wire cable whenever the cost of the chains is not materially greater.” Lindenthal was unsuccessful in having any of his plans for a chain bridge accepted. He proposed to build his bridges by stiffening the chains rather than the deck. Gustav Lindenthal became a proponent for iron chain bridges for his proposed North River (Hudson) Bridge, Manhattan Bridge (East River, NYC), and Quebec Bridges (St. In the United States, James Finley was the first to use chains for his suspension bridges. ![]() Eye-bar suspension bridges had been built in Britain, starting with Thomas Telford, Samuel Brown, and Isambard Brunel. The Bridge Company selected the American Bridge Company to build the bridge using a chain made of eye-bars. We expect to have these bids in within a short time, after which the type of cable will be decided upon, and we will forward you additional plans covering this part of the work.” ![]() In asking for bids on the superstructure, two alternatives to this, namely, a long lay wire rope cable or heat-treated I-bars, may be bid upon. The cable design calls for a straight wire cable. “In accordance with your request, we are sending you a set of plans and specifications for the Point Pleasant Highway Bridge. In a letter accompanying the plans, Greiner wrote to the District Engineer, A new District Engineer took over and requested a set of plans and specifications for the bridge. They submitted revised plans on May 2, 1927, which were approved. They were rejected as they did not conform to the approved plan. On April 28, 1927, the American Bridge Company, which made the low bid, submitted plans for approval to the Corps. Greiner were for a conventional suspension bridge with wire cables, two lanes of traffic, and a sidewalk located inside the side trusses. ![]() After a public hearing, the Board recommended approval of the plans with minor revisions. On December 29, 1926, plans were submitted to the Corps, which appointed a Board of Engineers to review them. ![]()
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