Re: image from Homestead, PA in 1915


Dennis Storzek
 

What catches my eye is the early interlocking steel sheet piling lining the excavations in the foreground. Here is a brief history quoted from this web site:
https://jdfieldsusa.wordpress.com/2015/03/07/history-of-sheet-piling/

"A manufacturer from the United States, Gregson, was the first to patent a bulb and jaw interlock in 1899 but this system still did not serve its intended purpose because it resulted in a flat section with a tiny section modulus. This then led to the first steel sheet pile with a U section and riveted interlocks being developed by Tryggve Larssen, the state chief engineer for the city of Bremen in Germany, at the turn of the century. Larssen’s wave shaped sheet pile was a revolutionary development because it increased the strength and efficiency of steel retaining walls. However, this design still contained an interlock system that was partially fabricated after the manufacturing process. In 1914, sheet pile with rivet-less interlocking systems made their debut in Germany. Sheet pile that has been developed since Larssen’s innovation have been based of his design concept."

Dennis Storzek

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