Throwback Thursday: Rebar in old-time ballparks

As baseball fans in New York, Tampa Bay and other American League East towns are painfully aware, the Boston Red Sox have clinched the division title. Naturally, being builders, we got to thinking about the team’s ancient home, Fenway Park (above). Built in 1912, it belongs to the first generation of sports stadiums constructed of steel-reinforced concrete, a material gaining widespread acceptance in the wake of San Francisco’s devastating earthquake of 1906. Other examples include Stanford Stadium (1921) and Los Angeles Memorial Coliseum (1923) in California, and of course the original Yankee Stadium (1923) in New York (pictured below).yankee_stadium1920s

Believe it or not, when crews erected Fenway’s “spacious grandstand” (as the Globe called it then and nobody does now), the process was so cutting-edge that the local Society of Civil Engineers visited to observe (below). Nevertheless, much of the project’s construction practices seem outdated today.

For example, carpenters built the formwork for the columns and deck slab out of oak timber, according to Glenn Stout, a former concrete foreman and the author of a history of the park’s construction. “They had to do everything with wood,” Stout said in an interview. “They didn’t use plywood back then; they used wooden planks—usually oak, which was readily available.” In fact, you can still see the marks of wood grain on the concrete in some places.fenway3a

Today, said Fred Collins of Liberty Construction, formwork is typically a composite of plywood and steel—a modular steel frame, with plywood facing. “For efficiency, for speed,” said Collins, who is Liberty’s northeast regional general superintendent of concrete field operations. “It enables you to pour larger quantities of concrete.”

The pouring process in 1912 was different, too. As Stout wrote in his book:

Unlike today, concrete was not mixed and then hauled to the site by truck. Instead a concrete plant was built on-site [where] cement, sand and an aggregate of crushed stone and water were mixed together [then dumped] into a concrete dump bucket. The wet concrete was hoisted to the appropriate place and the concrete emptied into wheeled sidecars . . . essentially wheelbarrows, but with much larger wheels and a much greater capacity.

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Wrigley Field, an early reinforced-concrete stadium, under construction, circa 1914. (Photo courtesy of ballparksofbaseball.com) 

Workers then “manhandled” these wheelbarrows into place and, “where possible, simply dumped the concrete onto the deck [then] raked it into place and agitated the concrete to remove any air bubbles,” Stout wrote. Where the deck sloped, the mix was “dumped into chutes, and workers then had to force the concrete down manually, using shovels not unlike canoe paddles.”

It was dirty, dangerous work, Stout added. A scratch from the rebar carried the threat of tetanus. “Shoulders and arms ached from the burden of shoveling the heavy mixture, which typically weighed 150 pounds per cubic foot. . . . For this, the workers earned perhaps fifty cents an hour.” Continue Reading ›